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-rw-r--r--askama_derive/Cargo.toml37
-rw-r--r--askama_derive/src/config.rs536
-rw-r--r--askama_derive/src/generator.rs2141
-rw-r--r--askama_derive/src/heritage.rs126
-rw-r--r--askama_derive/src/input.rs255
-rw-r--r--askama_derive/src/lib.rs92
-rw-r--r--askama_derive/src/parser.rs1885
-rw-r--r--askama_derive/templates/a.html1
-rw-r--r--askama_derive/templates/b.html1
-rw-r--r--askama_derive/templates/sub/b.html1
-rw-r--r--askama_derive/templates/sub/c.html1
-rw-r--r--askama_derive/templates/sub/sub1/d.html1
12 files changed, 5061 insertions, 16 deletions
diff --git a/askama_derive/Cargo.toml b/askama_derive/Cargo.toml
index 016960d..ce7abfa 100644
--- a/askama_derive/Cargo.toml
+++ b/askama_derive/Cargo.toml
@@ -13,20 +13,27 @@ edition = "2018"
proc-macro = true
[features]
-config = ["askama_shared/config"]
-humansize = ["askama_shared/humansize"]
-markdown = ["askama_shared/markdown"]
-urlencode = ["askama_shared/percent-encoding"]
-serde-json = ["askama_shared/json"]
-serde-yaml = ["askama_shared/yaml"]
-num-traits = ["askama_shared/num-traits"]
-with-actix-web = ["askama_shared/actix-web"]
-with-axum = ["askama_shared/axum"]
-with-gotham = ["askama_shared/gotham"]
-with-mendes = ["askama_shared/mendes"]
-with-rocket = ["askama_shared/rocket"]
-with-tide = ["askama_shared/tide"]
-with-warp = ["askama_shared/warp"]
+config = ["serde", "toml"]
+humansize = []
+markdown = []
+urlencode = []
+serde-json = []
+serde-yaml = []
+num-traits = []
+with-actix-web = []
+with-axum = []
+with-gotham = []
+with-mendes = []
+with-rocket = []
+with-tide = []
+with-warp = []
[dependencies]
-askama_shared = { version = "0.13.0", path = "../askama_shared", default-features = false }
+mime = "0.3"
+mime_guess = "2"
+nom = "7"
+proc-macro2 = "1"
+quote = "1"
+serde = { version = "1.0", optional = true, features = ["derive"] }
+syn = "1"
+toml = { version = "0.5", optional = true }
diff --git a/askama_derive/src/config.rs b/askama_derive/src/config.rs
new file mode 100644
index 0000000..01f81a2
--- /dev/null
+++ b/askama_derive/src/config.rs
@@ -0,0 +1,536 @@
+use std::collections::{BTreeMap, HashSet};
+use std::convert::TryFrom;
+use std::path::{Path, PathBuf};
+use std::{env, fs};
+
+#[cfg(feature = "serde")]
+use serde::Deserialize;
+
+use crate::CompileError;
+
+#[derive(Debug)]
+pub(crate) struct Config<'a> {
+ pub(crate) dirs: Vec<PathBuf>,
+ pub(crate) syntaxes: BTreeMap<String, Syntax<'a>>,
+ pub(crate) default_syntax: &'a str,
+ pub(crate) escapers: Vec<(HashSet<String>, String)>,
+ pub(crate) whitespace: WhitespaceHandling,
+}
+
+impl Config<'_> {
+ pub(crate) fn new(s: &str) -> std::result::Result<Config<'_>, CompileError> {
+ let root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+ let default_dirs = vec![root.join("templates")];
+
+ let mut syntaxes = BTreeMap::new();
+ syntaxes.insert(DEFAULT_SYNTAX_NAME.to_string(), Syntax::default());
+
+ let raw = if s.is_empty() {
+ RawConfig::default()
+ } else {
+ RawConfig::from_toml_str(s)?
+ };
+
+ let (dirs, default_syntax, whitespace) = match raw.general {
+ Some(General {
+ dirs,
+ default_syntax,
+ whitespace,
+ }) => (
+ dirs.map_or(default_dirs, |v| {
+ v.into_iter().map(|dir| root.join(dir)).collect()
+ }),
+ default_syntax.unwrap_or(DEFAULT_SYNTAX_NAME),
+ whitespace,
+ ),
+ None => (
+ default_dirs,
+ DEFAULT_SYNTAX_NAME,
+ WhitespaceHandling::default(),
+ ),
+ };
+
+ if let Some(raw_syntaxes) = raw.syntax {
+ for raw_s in raw_syntaxes {
+ let name = raw_s.name;
+
+ if syntaxes
+ .insert(name.to_string(), Syntax::try_from(raw_s)?)
+ .is_some()
+ {
+ return Err(format!("syntax \"{}\" is already defined", name).into());
+ }
+ }
+ }
+
+ if !syntaxes.contains_key(default_syntax) {
+ return Err(format!("default syntax \"{}\" not found", default_syntax).into());
+ }
+
+ let mut escapers = Vec::new();
+ if let Some(configured) = raw.escaper {
+ for escaper in configured {
+ escapers.push((
+ escaper
+ .extensions
+ .iter()
+ .map(|ext| (*ext).to_string())
+ .collect(),
+ escaper.path.to_string(),
+ ));
+ }
+ }
+ for (extensions, path) in DEFAULT_ESCAPERS {
+ escapers.push((str_set(extensions), (*path).to_string()));
+ }
+
+ Ok(Config {
+ dirs,
+ syntaxes,
+ default_syntax,
+ escapers,
+ whitespace,
+ })
+ }
+
+ pub(crate) fn find_template(
+ &self,
+ path: &str,
+ start_at: Option<&Path>,
+ ) -> std::result::Result<PathBuf, CompileError> {
+ if let Some(root) = start_at {
+ let relative = root.with_file_name(path);
+ if relative.exists() {
+ return Ok(relative);
+ }
+ }
+
+ for dir in &self.dirs {
+ let rooted = dir.join(path);
+ if rooted.exists() {
+ return Ok(rooted);
+ }
+ }
+
+ Err(format!(
+ "template {:?} not found in directories {:?}",
+ path, self.dirs
+ )
+ .into())
+ }
+}
+
+#[derive(Debug)]
+pub(crate) struct Syntax<'a> {
+ pub(crate) block_start: &'a str,
+ pub(crate) block_end: &'a str,
+ pub(crate) expr_start: &'a str,
+ pub(crate) expr_end: &'a str,
+ pub(crate) comment_start: &'a str,
+ pub(crate) comment_end: &'a str,
+}
+
+impl Default for Syntax<'_> {
+ fn default() -> Self {
+ Self {
+ block_start: "{%",
+ block_end: "%}",
+ expr_start: "{{",
+ expr_end: "}}",
+ comment_start: "{#",
+ comment_end: "#}",
+ }
+ }
+}
+
+impl<'a> TryFrom<RawSyntax<'a>> for Syntax<'a> {
+ type Error = CompileError;
+
+ fn try_from(raw: RawSyntax<'a>) -> std::result::Result<Self, Self::Error> {
+ let default = Self::default();
+ let syntax = Self {
+ block_start: raw.block_start.unwrap_or(default.block_start),
+ block_end: raw.block_end.unwrap_or(default.block_end),
+ expr_start: raw.expr_start.unwrap_or(default.expr_start),
+ expr_end: raw.expr_end.unwrap_or(default.expr_end),
+ comment_start: raw.comment_start.unwrap_or(default.comment_start),
+ comment_end: raw.comment_end.unwrap_or(default.comment_end),
+ };
+
+ if syntax.block_start.len() != 2
+ || syntax.block_end.len() != 2
+ || syntax.expr_start.len() != 2
+ || syntax.expr_end.len() != 2
+ || syntax.comment_start.len() != 2
+ || syntax.comment_end.len() != 2
+ {
+ return Err("length of delimiters must be two".into());
+ }
+
+ let bs = syntax.block_start.as_bytes()[0];
+ let be = syntax.block_start.as_bytes()[1];
+ let cs = syntax.comment_start.as_bytes()[0];
+ let ce = syntax.comment_start.as_bytes()[1];
+ let es = syntax.expr_start.as_bytes()[0];
+ let ee = syntax.expr_start.as_bytes()[1];
+ if !((bs == cs && bs == es) || (be == ce && be == ee)) {
+ return Err(format!("bad delimiters block_start: {}, comment_start: {}, expr_start: {}, needs one of the two characters in common", syntax.block_start, syntax.comment_start, syntax.expr_start).into());
+ }
+
+ Ok(syntax)
+ }
+}
+
+#[cfg_attr(feature = "serde", derive(Deserialize))]
+#[derive(Default)]
+struct RawConfig<'d> {
+ #[cfg_attr(feature = "serde", serde(borrow))]
+ general: Option<General<'d>>,
+ syntax: Option<Vec<RawSyntax<'d>>>,
+ escaper: Option<Vec<RawEscaper<'d>>>,
+}
+
+impl RawConfig<'_> {
+ #[cfg(feature = "config")]
+ fn from_toml_str(s: &str) -> std::result::Result<RawConfig<'_>, CompileError> {
+ toml::from_str(s).map_err(|e| format!("invalid TOML in {}: {}", CONFIG_FILE_NAME, e).into())
+ }
+
+ #[cfg(not(feature = "config"))]
+ fn from_toml_str(_: &str) -> std::result::Result<RawConfig<'_>, CompileError> {
+ Err("TOML support not available".into())
+ }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[cfg_attr(feature = "serde", derive(Deserialize))]
+#[cfg_attr(feature = "serde", serde(field_identifier, rename_all = "lowercase"))]
+pub(crate) enum WhitespaceHandling {
+ /// The default behaviour. It will leave the whitespace characters "as is".
+ Preserve,
+ /// It'll remove all the whitespace characters before and after the jinja block.
+ Suppress,
+ /// It'll remove all the whitespace characters except one before and after the jinja blocks.
+ /// If there is a newline character, the preserved character in the trimmed characters, it will
+ /// the one preserved.
+ Minimize,
+}
+
+impl Default for WhitespaceHandling {
+ fn default() -> Self {
+ WhitespaceHandling::Preserve
+ }
+}
+
+#[cfg_attr(feature = "serde", derive(Deserialize))]
+struct General<'a> {
+ #[cfg_attr(feature = "serde", serde(borrow))]
+ dirs: Option<Vec<&'a str>>,
+ default_syntax: Option<&'a str>,
+ #[cfg_attr(feature = "serde", serde(default))]
+ whitespace: WhitespaceHandling,
+}
+
+#[cfg_attr(feature = "serde", derive(Deserialize))]
+struct RawSyntax<'a> {
+ name: &'a str,
+ block_start: Option<&'a str>,
+ block_end: Option<&'a str>,
+ expr_start: Option<&'a str>,
+ expr_end: Option<&'a str>,
+ comment_start: Option<&'a str>,
+ comment_end: Option<&'a str>,
+}
+
+#[cfg_attr(feature = "serde", derive(Deserialize))]
+struct RawEscaper<'a> {
+ path: &'a str,
+ extensions: Vec<&'a str>,
+}
+
+pub(crate) fn read_config_file(
+ config_path: &Option<String>,
+) -> std::result::Result<String, CompileError> {
+ let root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+ let filename = match config_path {
+ Some(config_path) => root.join(config_path),
+ None => root.join(CONFIG_FILE_NAME),
+ };
+
+ if filename.exists() {
+ fs::read_to_string(&filename)
+ .map_err(|_| format!("unable to read {:?}", filename.to_str().unwrap()).into())
+ } else if config_path.is_some() {
+ Err(format!("`{}` does not exist", root.display()).into())
+ } else {
+ Ok("".to_string())
+ }
+}
+
+fn str_set<T>(vals: &[T]) -> HashSet<String>
+where
+ T: ToString,
+{
+ vals.iter().map(|s| s.to_string()).collect()
+}
+
+#[allow(clippy::match_wild_err_arm)]
+pub(crate) fn get_template_source(tpl_path: &Path) -> std::result::Result<String, CompileError> {
+ match fs::read_to_string(tpl_path) {
+ Err(_) => Err(format!(
+ "unable to open template file '{}'",
+ tpl_path.to_str().unwrap()
+ )
+ .into()),
+ Ok(mut source) => {
+ if source.ends_with('\n') {
+ let _ = source.pop();
+ }
+ Ok(source)
+ }
+ }
+}
+
+static CONFIG_FILE_NAME: &str = "askama.toml";
+static DEFAULT_SYNTAX_NAME: &str = "default";
+static DEFAULT_ESCAPERS: &[(&[&str], &str)] = &[
+ (&["html", "htm", "xml"], "::askama::Html"),
+ (&["md", "none", "txt", "yml", ""], "::askama::Text"),
+ (&["j2", "jinja", "jinja2"], "::askama::Html"),
+];
+
+#[cfg(test)]
+#[allow(clippy::blacklisted_name)]
+mod tests {
+ use std::env;
+ use std::path::{Path, PathBuf};
+
+ use super::*;
+
+ #[test]
+ fn get_source() {
+ let path = Config::new("")
+ .and_then(|config| config.find_template("b.html", None))
+ .unwrap();
+ assert_eq!(get_template_source(&path).unwrap(), "bar");
+ }
+
+ #[test]
+ fn test_default_config() {
+ let mut root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+ root.push("templates");
+ let config = Config::new("").unwrap();
+ assert_eq!(config.dirs, vec![root]);
+ }
+
+ #[cfg(feature = "config")]
+ #[test]
+ fn test_config_dirs() {
+ let mut root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+ root.push("tpl");
+ let config = Config::new("[general]\ndirs = [\"tpl\"]").unwrap();
+ assert_eq!(config.dirs, vec![root]);
+ }
+
+ fn assert_eq_rooted(actual: &Path, expected: &str) {
+ let mut root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+ root.push("templates");
+ let mut inner = PathBuf::new();
+ inner.push(expected);
+ assert_eq!(actual.strip_prefix(root).unwrap(), inner);
+ }
+
+ #[test]
+ fn find_absolute() {
+ let config = Config::new("").unwrap();
+ let root = config.find_template("a.html", None).unwrap();
+ let path = config.find_template("sub/b.html", Some(&root)).unwrap();
+ assert_eq_rooted(&path, "sub/b.html");
+ }
+
+ #[test]
+ #[should_panic]
+ fn find_relative_nonexistent() {
+ let config = Config::new("").unwrap();
+ let root = config.find_template("a.html", None).unwrap();
+ config.find_template("c.html", Some(&root)).unwrap();
+ }
+
+ #[test]
+ fn find_relative() {
+ let config = Config::new("").unwrap();
+ let root = config.find_template("sub/b.html", None).unwrap();
+ let path = config.find_template("c.html", Some(&root)).unwrap();
+ assert_eq_rooted(&path, "sub/c.html");
+ }
+
+ #[test]
+ fn find_relative_sub() {
+ let config = Config::new("").unwrap();
+ let root = config.find_template("sub/b.html", None).unwrap();
+ let path = config.find_template("sub1/d.html", Some(&root)).unwrap();
+ assert_eq_rooted(&path, "sub/sub1/d.html");
+ }
+
+ #[cfg(feature = "config")]
+ #[test]
+ fn add_syntax() {
+ let raw_config = r#"
+ [general]
+ default_syntax = "foo"
+
+ [[syntax]]
+ name = "foo"
+ block_start = "{<"
+
+ [[syntax]]
+ name = "bar"
+ expr_start = "{!"
+ "#;
+
+ let default_syntax = Syntax::default();
+ let config = Config::new(raw_config).unwrap();
+ assert_eq!(config.default_syntax, "foo");
+
+ let foo = config.syntaxes.get("foo").unwrap();
+ assert_eq!(foo.block_start, "{<");
+ assert_eq!(foo.block_end, default_syntax.block_end);
+ assert_eq!(foo.expr_start, default_syntax.expr_start);
+ assert_eq!(foo.expr_end, default_syntax.expr_end);
+ assert_eq!(foo.comment_start, default_syntax.comment_start);
+ assert_eq!(foo.comment_end, default_syntax.comment_end);
+
+ let bar = config.syntaxes.get("bar").unwrap();
+ assert_eq!(bar.block_start, default_syntax.block_start);
+ assert_eq!(bar.block_end, default_syntax.block_end);
+ assert_eq!(bar.expr_start, "{!");
+ assert_eq!(bar.expr_end, default_syntax.expr_end);
+ assert_eq!(bar.comment_start, default_syntax.comment_start);
+ assert_eq!(bar.comment_end, default_syntax.comment_end);
+ }
+
+ #[cfg(feature = "config")]
+ #[test]
+ fn add_syntax_two() {
+ let raw_config = r#"
+ syntax = [{ name = "foo", block_start = "{<" },
+ { name = "bar", expr_start = "{!" } ]
+
+ [general]
+ default_syntax = "foo"
+ "#;
+
+ let default_syntax = Syntax::default();
+ let config = Config::new(raw_config).unwrap();
+ assert_eq!(config.default_syntax, "foo");
+
+ let foo = config.syntaxes.get("foo").unwrap();
+ assert_eq!(foo.block_start, "{<");
+ assert_eq!(foo.block_end, default_syntax.block_end);
+ assert_eq!(foo.expr_start, default_syntax.expr_start);
+ assert_eq!(foo.expr_end, default_syntax.expr_end);
+ assert_eq!(foo.comment_start, default_syntax.comment_start);
+ assert_eq!(foo.comment_end, default_syntax.comment_end);
+
+ let bar = config.syntaxes.get("bar").unwrap();
+ assert_eq!(bar.block_start, default_syntax.block_start);
+ assert_eq!(bar.block_end, default_syntax.block_end);
+ assert_eq!(bar.expr_start, "{!");
+ assert_eq!(bar.expr_end, default_syntax.expr_end);
+ assert_eq!(bar.comment_start, default_syntax.comment_start);
+ assert_eq!(bar.comment_end, default_syntax.comment_end);
+ }
+
+ #[cfg(feature = "toml")]
+ #[should_panic]
+ #[test]
+ fn use_default_at_syntax_name() {
+ let raw_config = r#"
+ syntax = [{ name = "default" }]
+ "#;
+
+ let _config = Config::new(raw_config).unwrap();
+ }
+
+ #[cfg(feature = "toml")]
+ #[should_panic]
+ #[test]
+ fn duplicated_syntax_name_on_list() {
+ let raw_config = r#"
+ syntax = [{ name = "foo", block_start = "~<" },
+ { name = "foo", block_start = "%%" } ]
+ "#;
+
+ let _config = Config::new(raw_config).unwrap();
+ }
+
+ #[cfg(feature = "toml")]
+ #[should_panic]
+ #[test]
+ fn is_not_exist_default_syntax() {
+ let raw_config = r#"
+ [general]
+ default_syntax = "foo"
+ "#;
+
+ let _config = Config::new(raw_config).unwrap();
+ }
+
+ #[cfg(feature = "config")]
+ #[test]
+ fn escape_modes() {
+ let config = Config::new(
+ r#"
+ [[escaper]]
+ path = "::askama::Js"
+ extensions = ["js"]
+ "#,
+ )
+ .unwrap();
+ assert_eq!(
+ config.escapers,
+ vec![
+ (str_set(&["js"]), "::askama::Js".into()),
+ (str_set(&["html", "htm", "xml"]), "::askama::Html".into()),
+ (
+ str_set(&["md", "none", "txt", "yml", ""]),
+ "::askama::Text".into()
+ ),
+ (str_set(&["j2", "jinja", "jinja2"]), "::askama::Html".into()),
+ ]
+ );
+ }
+
+ #[test]
+ fn test_whitespace_parsing() {
+ let config = Config::new(
+ r#"
+ [general]
+ whitespace = "suppress"
+ "#,
+ )
+ .unwrap();
+ assert_eq!(config.whitespace, WhitespaceHandling::Suppress);
+
+ let config = Config::new(r#""#).unwrap();
+ assert_eq!(config.whitespace, WhitespaceHandling::Preserve);
+
+ let config = Config::new(
+ r#"
+ [general]
+ whitespace = "preserve"
+ "#,
+ )
+ .unwrap();
+ assert_eq!(config.whitespace, WhitespaceHandling::Preserve);
+
+ let config = Config::new(
+ r#"
+ [general]
+ whitespace = "minimize"
+ "#,
+ )
+ .unwrap();
+ assert_eq!(config.whitespace, WhitespaceHandling::Minimize);
+ }
+}
diff --git a/askama_derive/src/generator.rs b/askama_derive/src/generator.rs
new file mode 100644
index 0000000..39a5380
--- /dev/null
+++ b/askama_derive/src/generator.rs
@@ -0,0 +1,2141 @@
+use crate::config::{get_template_source, read_config_file, Config, WhitespaceHandling};
+use crate::heritage::{Context, Heritage};
+use crate::input::{Print, Source, TemplateInput};
+use crate::parser::{parse, Cond, CondTest, Expr, Loop, Node, Target, When, Whitespace, Ws};
+use crate::CompileError;
+
+use proc_macro::TokenStream;
+use quote::{quote, ToTokens};
+
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::{cmp, hash, mem, str};
+
+/// The actual implementation for askama_derive::Template
+pub(crate) fn derive_template(input: TokenStream) -> TokenStream {
+ let ast: syn::DeriveInput = syn::parse(input).unwrap();
+ match build_template(&ast) {
+ Ok(source) => source.parse().unwrap(),
+ Err(e) => e.into_compile_error(),
+ }
+}
+
+/// Takes a `syn::DeriveInput` and generates source code for it
+///
+/// Reads the metadata from the `template()` attribute to get the template
+/// metadata, then fetches the source from the filesystem. The source is
+/// parsed, and the parse tree is fed to the code generator. Will print
+/// the parse tree and/or generated source according to the `print` key's
+/// value as passed to the `template()` attribute.
+fn build_template(ast: &syn::DeriveInput) -> Result<String, CompileError> {
+ let template_args = TemplateArgs::new(ast)?;
+ let config_toml = read_config_file(&template_args.config_path)?;
+ let config = Config::new(&config_toml)?;
+ let input = TemplateInput::new(ast, &config, template_args)?;
+ let source: String = match input.source {
+ Source::Source(ref s) => s.clone(),
+ Source::Path(_) => get_template_source(&input.path)?,
+ };
+
+ let mut sources = HashMap::new();
+ find_used_templates(&input, &mut sources, source)?;
+
+ let mut parsed = HashMap::new();
+ for (path, src) in &sources {
+ parsed.insert(path.as_path(), parse(src, input.syntax)?);
+ }
+
+ let mut contexts = HashMap::new();
+ for (path, nodes) in &parsed {
+ contexts.insert(*path, Context::new(input.config, path, nodes)?);
+ }
+
+ let ctx = &contexts[input.path.as_path()];
+ let heritage = if !ctx.blocks.is_empty() || ctx.extends.is_some() {
+ Some(Heritage::new(ctx, &contexts))
+ } else {
+ None
+ };
+
+ if input.print == Print::Ast || input.print == Print::All {
+ eprintln!("{:?}", parsed[input.path.as_path()]);
+ }
+
+ let code = Generator::new(
+ &input,
+ &contexts,
+ heritage.as_ref(),
+ MapChain::new(),
+ config.whitespace,
+ )
+ .build(&contexts[input.path.as_path()])?;
+ if input.print == Print::Code || input.print == Print::All {
+ eprintln!("{}", code);
+ }
+ Ok(code)
+}
+
+#[derive(Default)]
+pub(crate) struct TemplateArgs {
+ pub(crate) source: Option<Source>,
+ pub(crate) print: Print,
+ pub(crate) escaping: Option<String>,
+ pub(crate) ext: Option<String>,
+ pub(crate) syntax: Option<String>,
+ pub(crate) config_path: Option<String>,
+}
+
+impl TemplateArgs {
+ fn new(ast: &'_ syn::DeriveInput) -> Result<Self, CompileError> {
+ // Check that an attribute called `template()` exists once and that it is
+ // the proper type (list).
+ let mut template_args = None;
+ for attr in &ast.attrs {
+ let ident = match attr.path.get_ident() {
+ Some(ident) => ident,
+ None => continue,
+ };
+
+ if ident == "template" {
+ if template_args.is_some() {
+ return Err("duplicated 'template' attribute".into());
+ }
+
+ match attr.parse_meta() {
+ Ok(syn::Meta::List(syn::MetaList { nested, .. })) => {
+ template_args = Some(nested);
+ }
+ Ok(_) => return Err("'template' attribute must be a list".into()),
+ Err(e) => return Err(format!("unable to parse attribute: {}", e).into()),
+ }
+ }
+ }
+ let template_args =
+ template_args.ok_or_else(|| CompileError::from("no attribute 'template' found"))?;
+
+ let mut args = Self::default();
+ // Loop over the meta attributes and find everything that we
+ // understand. Return a CompileError if something is not right.
+ // `source` contains an enum that can represent `path` or `source`.
+ for item in template_args {
+ let pair = match item {
+ syn::NestedMeta::Meta(syn::Meta::NameValue(ref pair)) => pair,
+ _ => {
+ return Err(format!(
+ "unsupported attribute argument {:?}",
+ item.to_token_stream()
+ )
+ .into())
+ }
+ };
+ let ident = match pair.path.get_ident() {
+ Some(ident) => ident,
+ None => unreachable!("not possible in syn::Meta::NameValue(…)"),
+ };
+
+ if ident == "path" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ if args.source.is_some() {
+ return Err("must specify 'source' or 'path', not both".into());
+ }
+ args.source = Some(Source::Path(s.value()));
+ } else {
+ return Err("template path must be string literal".into());
+ }
+ } else if ident == "source" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ if args.source.is_some() {
+ return Err("must specify 'source' or 'path', not both".into());
+ }
+ args.source = Some(Source::Source(s.value()));
+ } else {
+ return Err("template source must be string literal".into());
+ }
+ } else if ident == "print" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ args.print = s.value().parse()?;
+ } else {
+ return Err("print value must be string literal".into());
+ }
+ } else if ident == "escape" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ args.escaping = Some(s.value());
+ } else {
+ return Err("escape value must be string literal".into());
+ }
+ } else if ident == "ext" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ args.ext = Some(s.value());
+ } else {
+ return Err("ext value must be string literal".into());
+ }
+ } else if ident == "syntax" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ args.syntax = Some(s.value())
+ } else {
+ return Err("syntax value must be string literal".into());
+ }
+ } else if ident == "config" {
+ if let syn::Lit::Str(ref s) = pair.lit {
+ args.config_path = Some(s.value())
+ } else {
+ return Err("config value must be string literal".into());
+ }
+ } else {
+ return Err(format!("unsupported attribute key {:?} found", ident).into());
+ }
+ }
+
+ Ok(args)
+ }
+}
+
+fn find_used_templates(
+ input: &TemplateInput<'_>,
+ map: &mut HashMap<PathBuf, String>,
+ source: String,
+) -> Result<(), CompileError> {
+ let mut dependency_graph = Vec::new();
+ let mut check = vec![(input.path.clone(), source)];
+ while let Some((path, source)) = check.pop() {
+ for n in parse(&source, input.syntax)? {
+ match n {
+ Node::Extends(Expr::StrLit(extends)) => {
+ let extends = input.config.find_template(extends, Some(&path))?;
+ let dependency_path = (path.clone(), extends.clone());
+ if dependency_graph.contains(&dependency_path) {
+ return Err(format!(
+ "cyclic dependecy in graph {:#?}",
+ dependency_graph
+ .iter()
+ .map(|e| format!("{:#?} --> {:#?}", e.0, e.1))
+ .collect::<Vec<String>>()
+ )
+ .into());
+ }
+ dependency_graph.push(dependency_path);
+ let source = get_template_source(&extends)?;
+ check.push((extends, source));
+ }
+ Node::Import(_, import, _) => {
+ let import = input.config.find_template(import, Some(&path))?;
+ let source = get_template_source(&import)?;
+ check.push((import, source));
+ }
+ _ => {}
+ }
+ }
+ map.insert(path, source);
+ }
+ Ok(())
+}
+struct Generator<'a, S: std::hash::BuildHasher> {
+ // The template input state: original struct AST and attributes
+ input: &'a TemplateInput<'a>,
+ // All contexts, keyed by the package-relative template path
+ contexts: &'a HashMap<&'a Path, Context<'a>, S>,
+ // The heritage contains references to blocks and their ancestry
+ heritage: Option<&'a Heritage<'a>>,
+ // Variables accessible directly from the current scope (not redirected to context)
+ locals: MapChain<'a, &'a str, LocalMeta>,
+ // Suffix whitespace from the previous literal. Will be flushed to the
+ // output buffer unless suppressed by whitespace suppression on the next
+ // non-literal.
+ next_ws: Option<&'a str>,
+ // Whitespace suppression from the previous non-literal. Will be used to
+ // determine whether to flush prefix whitespace from the next literal.
+ skip_ws: WhitespaceHandling,
+ // If currently in a block, this will contain the name of a potential parent block
+ super_block: Option<(&'a str, usize)>,
+ // buffer for writable
+ buf_writable: Vec<Writable<'a>>,
+ // Counter for write! hash named arguments
+ named: usize,
+ // If set to `suppress`, the whitespace characters will be removed by default unless `+` is
+ // used.
+ whitespace: WhitespaceHandling,
+}
+
+impl<'a, S: std::hash::BuildHasher> Generator<'a, S> {
+ fn new<'n>(
+ input: &'n TemplateInput<'_>,
+ contexts: &'n HashMap<&'n Path, Context<'n>, S>,
+ heritage: Option<&'n Heritage<'_>>,
+ locals: MapChain<'n, &'n str, LocalMeta>,
+ whitespace: WhitespaceHandling,
+ ) -> Generator<'n, S> {
+ Generator {
+ input,
+ contexts,
+ heritage,
+ locals,
+ next_ws: None,
+ skip_ws: WhitespaceHandling::Preserve,
+ super_block: None,
+ buf_writable: vec![],
+ named: 0,
+ whitespace,
+ }
+ }
+
+ fn child(&mut self) -> Generator<'_, S> {
+ let locals = MapChain::with_parent(&self.locals);
+ Self::new(
+ self.input,
+ self.contexts,
+ self.heritage,
+ locals,
+ self.whitespace,
+ )
+ }
+
+ // Takes a Context and generates the relevant implementations.
+ fn build(mut self, ctx: &'a Context<'_>) -> Result<String, CompileError> {
+ let mut buf = Buffer::new(0);
+ if !ctx.blocks.is_empty() {
+ if let Some(parent) = self.input.parent {
+ self.deref_to_parent(&mut buf, parent)?;
+ }
+ };
+
+ self.impl_template(ctx, &mut buf)?;
+ self.impl_display(&mut buf)?;
+
+ #[cfg(feature = "with-actix-web")]
+ self.impl_actix_web_responder(&mut buf)?;
+ #[cfg(feature = "with-axum")]
+ self.impl_axum_into_response(&mut buf)?;
+ #[cfg(feature = "with-gotham")]
+ self.impl_gotham_into_response(&mut buf)?;
+ #[cfg(feature = "with-mendes")]
+ self.impl_mendes_responder(&mut buf)?;
+ #[cfg(feature = "with-rocket")]
+ self.impl_rocket_responder(&mut buf)?;
+ #[cfg(feature = "with-tide")]
+ self.impl_tide_integrations(&mut buf)?;
+ #[cfg(feature = "with-warp")]
+ self.impl_warp_reply(&mut buf)?;
+
+ Ok(buf.buf)
+ }
+
+ // Implement `Template` for the given context struct.
+ fn impl_template(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ ) -> Result<(), CompileError> {
+ self.write_header(buf, "::askama::Template", None)?;
+ buf.writeln(
+ "fn render_into(&self, writer: &mut (impl ::std::fmt::Write + ?Sized)) -> \
+ ::askama::Result<()> {",
+ )?;
+
+ // Make sure the compiler understands that the generated code depends on the template files.
+ for path in self.contexts.keys() {
+ // Skip the fake path of templates defined in rust source.
+ let path_is_valid = match self.input.source {
+ Source::Path(_) => true,
+ Source::Source(_) => path != &self.input.path,
+ };
+ if path_is_valid {
+ let path = path.to_str().unwrap();
+ buf.writeln(
+ &quote! {
+ include_bytes!(#path);
+ }
+ .to_string(),
+ )?;
+ }
+ }
+
+ let size_hint = if let Some(heritage) = self.heritage {
+ self.handle(heritage.root, heritage.root.nodes, buf, AstLevel::Top)
+ } else {
+ self.handle(ctx, ctx.nodes, buf, AstLevel::Top)
+ }?;
+
+ self.flush_ws(Ws(None, None));
+ buf.writeln("::askama::Result::Ok(())")?;
+ buf.writeln("}")?;
+
+ buf.writeln("const EXTENSION: ::std::option::Option<&'static ::std::primitive::str> = ")?;
+ buf.writeln(&format!("{:?}", self.input.extension()))?;
+ buf.writeln(";")?;
+
+ buf.writeln("const SIZE_HINT: ::std::primitive::usize = ")?;
+ buf.writeln(&format!("{}", size_hint))?;
+ buf.writeln(";")?;
+
+ buf.writeln("const MIME_TYPE: &'static ::std::primitive::str = ")?;
+ buf.writeln(&format!("{:?}", &self.input.mime_type))?;
+ buf.writeln(";")?;
+
+ buf.writeln("}")?;
+ Ok(())
+ }
+
+ // Implement `Deref<Parent>` for an inheriting context struct.
+ fn deref_to_parent(
+ &mut self,
+ buf: &mut Buffer,
+ parent_type: &syn::Type,
+ ) -> Result<(), CompileError> {
+ self.write_header(buf, "::std::ops::Deref", None)?;
+ buf.writeln(&format!(
+ "type Target = {};",
+ parent_type.into_token_stream()
+ ))?;
+ buf.writeln("#[inline]")?;
+ buf.writeln("fn deref(&self) -> &Self::Target {")?;
+ buf.writeln("&self._parent")?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Implement `Display` for the given context struct.
+ fn impl_display(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ self.write_header(buf, "::std::fmt::Display", None)?;
+ buf.writeln("#[inline]")?;
+ buf.writeln("fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {")?;
+ buf.writeln("::askama::Template::render_into(self, f).map_err(|_| ::std::fmt::Error {})")?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Implement Actix-web's `Responder`.
+ #[cfg(feature = "with-actix-web")]
+ fn impl_actix_web_responder(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ self.write_header(buf, "::askama_actix::actix_web::Responder", None)?;
+ buf.writeln("type Body = ::askama_actix::actix_web::body::BoxBody;")?;
+ buf.writeln("#[inline]")?;
+ buf.writeln(
+ "fn respond_to(self, _req: &::askama_actix::actix_web::HttpRequest) \
+ -> ::askama_actix::actix_web::HttpResponse<Self::Body> {",
+ )?;
+ buf.writeln("<Self as ::askama_actix::TemplateToResponse>::to_response(&self)")?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Implement Axum's `IntoResponse`.
+ #[cfg(feature = "with-axum")]
+ fn impl_axum_into_response(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ self.write_header(buf, "::askama_axum::IntoResponse", None)?;
+ buf.writeln("#[inline]")?;
+ buf.writeln(
+ "fn into_response(self)\
+ -> ::askama_axum::Response {",
+ )?;
+ let ext = self.input.extension().unwrap_or("txt");
+ buf.writeln(&format!("::askama_axum::into_response(&self, {:?})", ext))?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Implement gotham's `IntoResponse`.
+ #[cfg(feature = "with-gotham")]
+ fn impl_gotham_into_response(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ self.write_header(buf, "::askama_gotham::IntoResponse", None)?;
+ buf.writeln("#[inline]")?;
+ buf.writeln(
+ "fn into_response(self, _state: &::askama_gotham::State)\
+ -> ::askama_gotham::Response<::askama_gotham::Body> {",
+ )?;
+ let ext = self.input.extension().unwrap_or("txt");
+ buf.writeln(&format!("::askama_gotham::respond(&self, {:?})", ext))?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Implement mendes' `Responder`.
+ #[cfg(feature = "with-mendes")]
+ fn impl_mendes_responder(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ let param = syn::parse_str("A: ::mendes::Application").unwrap();
+
+ let mut generics = self.input.ast.generics.clone();
+ generics.params.push(param);
+ let (_, orig_ty_generics, _) = self.input.ast.generics.split_for_impl();
+ let (impl_generics, _, where_clause) = generics.split_for_impl();
+
+ let mut where_clause = match where_clause {
+ Some(clause) => clause.clone(),
+ None => syn::WhereClause {
+ where_token: syn::Token![where](proc_macro2::Span::call_site()),
+ predicates: syn::punctuated::Punctuated::new(),
+ },
+ };
+
+ where_clause
+ .predicates
+ .push(syn::parse_str("A::ResponseBody: From<String>").unwrap());
+ where_clause
+ .predicates
+ .push(syn::parse_str("A::Error: From<::askama_mendes::Error>").unwrap());
+
+ buf.writeln(
+ format!(
+ "{} {} for {} {} {{",
+ quote!(impl#impl_generics),
+ "::mendes::application::IntoResponse<A>",
+ self.input.ast.ident,
+ quote!(#orig_ty_generics #where_clause),
+ )
+ .as_ref(),
+ )?;
+
+ buf.writeln(
+ "fn into_response(self, app: &A, req: &::mendes::http::request::Parts) \
+ -> ::mendes::http::Response<A::ResponseBody> {",
+ )?;
+
+ buf.writeln(&format!(
+ "::askama_mendes::into_response(app, req, &self, {:?})",
+ self.input.extension()
+ ))?;
+ buf.writeln("}")?;
+ buf.writeln("}")?;
+ Ok(())
+ }
+
+ // Implement Rocket's `Responder`.
+ #[cfg(feature = "with-rocket")]
+ fn impl_rocket_responder(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ let lifetime = syn::Lifetime::new("'askama", proc_macro2::Span::call_site());
+ let param = syn::GenericParam::Lifetime(syn::LifetimeDef::new(lifetime));
+ self.write_header(
+ buf,
+ "::askama_rocket::Responder<'askama>",
+ Some(vec![param]),
+ )?;
+
+ buf.writeln("#[inline]")?;
+ buf.writeln(
+ "fn respond_to(self, _: &::askama_rocket::Request) \
+ -> ::askama_rocket::Result<'askama> {",
+ )?;
+ let ext = self.input.extension().unwrap_or("txt");
+ buf.writeln(&format!("::askama_rocket::respond(&self, {:?})", ext))?;
+
+ buf.writeln("}")?;
+ buf.writeln("}")?;
+ Ok(())
+ }
+
+ #[cfg(feature = "with-tide")]
+ fn impl_tide_integrations(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ let ext = self.input.extension().unwrap_or("txt");
+
+ self.write_header(
+ buf,
+ "::std::convert::TryInto<::askama_tide::tide::Body>",
+ None,
+ )?;
+ buf.writeln(
+ "type Error = ::askama_tide::askama::Error;\n\
+ #[inline]\n\
+ fn try_into(self) -> ::askama_tide::askama::Result<::askama_tide::tide::Body> {",
+ )?;
+ buf.writeln(&format!("::askama_tide::try_into_body(&self, {:?})", &ext))?;
+ buf.writeln("}")?;
+ buf.writeln("}")?;
+
+ buf.writeln("#[allow(clippy::from_over_into)]")?;
+ self.write_header(buf, "Into<::askama_tide::tide::Response>", None)?;
+ buf.writeln("#[inline]")?;
+ buf.writeln("fn into(self) -> ::askama_tide::tide::Response {")?;
+ buf.writeln(&format!("::askama_tide::into_response(&self, {:?})", ext))?;
+ buf.writeln("}\n}")
+ }
+
+ #[cfg(feature = "with-warp")]
+ fn impl_warp_reply(&mut self, buf: &mut Buffer) -> Result<(), CompileError> {
+ self.write_header(buf, "::askama_warp::warp::reply::Reply", None)?;
+ buf.writeln("#[inline]")?;
+ buf.writeln("fn into_response(self) -> ::askama_warp::warp::reply::Response {")?;
+ let ext = self.input.extension().unwrap_or("txt");
+ buf.writeln(&format!("::askama_warp::reply(&self, {:?})", ext))?;
+ buf.writeln("}")?;
+ buf.writeln("}")
+ }
+
+ // Writes header for the `impl` for `TraitFromPathName` or `Template`
+ // for the given context struct.
+ fn write_header(
+ &mut self,
+ buf: &mut Buffer,
+ target: &str,
+ params: Option<Vec<syn::GenericParam>>,
+ ) -> Result<(), CompileError> {
+ let mut generics = self.input.ast.generics.clone();
+ if let Some(params) = params {
+ for param in params {
+ generics.params.push(param);
+ }
+ }
+ let (_, orig_ty_generics, _) = self.input.ast.generics.split_for_impl();
+ let (impl_generics, _, where_clause) = generics.split_for_impl();
+ buf.writeln(
+ format!(
+ "{} {} for {}{} {{",
+ quote!(impl#impl_generics),
+ target,
+ self.input.ast.ident,
+ quote!(#orig_ty_generics #where_clause),
+ )
+ .as_ref(),
+ )
+ }
+
+ /* Helper methods for handling node types */
+
+ fn handle(
+ &mut self,
+ ctx: &'a Context<'_>,
+ nodes: &'a [Node<'_>],
+ buf: &mut Buffer,
+ level: AstLevel,
+ ) -> Result<usize, CompileError> {
+ let mut size_hint = 0;
+ for n in nodes {
+ match *n {
+ Node::Lit(lws, val, rws) => {
+ self.visit_lit(lws, val, rws);
+ }
+ Node::Comment(ws) => {
+ self.write_comment(ws);
+ }
+ Node::Expr(ws, ref val) => {
+ self.write_expr(ws, val);
+ }
+ Node::LetDecl(ws, ref var) => {
+ self.write_let_decl(buf, ws, var)?;
+ }
+ Node::Let(ws, ref var, ref val) => {
+ self.write_let(buf, ws, var, val)?;
+ }
+ Node::Cond(ref conds, ws) => {
+ self.write_cond(ctx, buf, conds, ws)?;
+ }
+ Node::Match(ws1, ref expr, ref arms, ws2) => {
+ self.write_match(ctx, buf, ws1, expr, arms, ws2)?;
+ }
+ Node::Loop(ref loop_block) => {
+ self.write_loop(ctx, buf, loop_block)?;
+ }
+ Node::BlockDef(ws1, name, _, ws2) => {
+ self.write_block(buf, Some(name), Ws(ws1.0, ws2.1))?;
+ }
+ Node::Include(ws, path) => {
+ size_hint += self.handle_include(ctx, buf, ws, path)?;
+ }
+ Node::Call(ws, scope, name, ref args) => {
+ size_hint += self.write_call(ctx, buf, ws, scope, name, args)?;
+ }
+ Node::Macro(_, ref m) => {
+ if level != AstLevel::Top {
+ return Err("macro blocks only allowed at the top level".into());
+ }
+ self.flush_ws(m.ws1);
+ self.prepare_ws(m.ws2);
+ }
+ Node::Raw(ws1, lws, val, rws, ws2) => {
+ self.handle_ws(ws1);
+ self.visit_lit(lws, val, rws);
+ self.handle_ws(ws2);
+ }
+ Node::Import(ws, _, _) => {
+ if level != AstLevel::Top {
+ return Err("import blocks only allowed at the top level".into());
+ }
+ self.handle_ws(ws);
+ }
+ Node::Extends(_) => {
+ if level != AstLevel::Top {
+ return Err("extend blocks only allowed at the top level".into());
+ }
+ // No whitespace handling: child template top-level is not used,
+ // except for the blocks defined in it.
+ }
+ Node::Break(ws) => {
+ self.handle_ws(ws);
+ self.write_buf_writable(buf)?;
+ buf.writeln("break;")?;
+ }
+ Node::Continue(ws) => {
+ self.handle_ws(ws);
+ self.write_buf_writable(buf)?;
+ buf.writeln("continue;")?;
+ }
+ }
+ }
+
+ if AstLevel::Top == level {
+ size_hint += self.write_buf_writable(buf)?;
+ }
+ Ok(size_hint)
+ }
+
+ fn write_cond(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ conds: &'a [Cond<'_>],
+ ws: Ws,
+ ) -> Result<usize, CompileError> {
+ let mut flushed = 0;
+ let mut arm_sizes = Vec::new();
+ let mut has_else = false;
+ for (i, &(cws, ref cond, ref nodes)) in conds.iter().enumerate() {
+ self.handle_ws(cws);
+ flushed += self.write_buf_writable(buf)?;
+ if i > 0 {
+ self.locals.pop();
+ }
+
+ self.locals.push();
+ let mut arm_size = 0;
+ if let Some(CondTest { target, expr }) = cond {
+ if i == 0 {
+ buf.write("if ");
+ } else {
+ buf.dedent()?;
+ buf.write("} else if ");
+ }
+
+ if let Some(target) = target {
+ let mut expr_buf = Buffer::new(0);
+ self.visit_expr(&mut expr_buf, expr)?;
+ buf.write("let ");
+ self.visit_target(buf, true, true, target);
+ buf.write(" = &(");
+ buf.write(&expr_buf.buf);
+ buf.write(")");
+ } else {
+ // The following syntax `*(&(...) as &bool)` is used to
+ // trigger Rust's automatic dereferencing, to coerce
+ // e.g. `&&&&&bool` to `bool`. First `&(...) as &bool`
+ // coerces e.g. `&&&bool` to `&bool`. Then `*(&bool)`
+ // finally dereferences it to `bool`.
+ buf.write("*(&(");
+ let expr_code = self.visit_expr_root(expr)?;
+ buf.write(&expr_code);
+ buf.write(") as &bool)");
+ }
+ } else {
+ buf.dedent()?;
+ buf.write("} else");
+ has_else = true;
+ }
+
+ buf.writeln(" {")?;
+
+ arm_size += self.handle(ctx, nodes, buf, AstLevel::Nested)?;
+ arm_sizes.push(arm_size);
+ }
+ self.handle_ws(ws);
+ flushed += self.write_buf_writable(buf)?;
+ buf.writeln("}")?;
+
+ self.locals.pop();
+
+ if !has_else {
+ arm_sizes.push(0);
+ }
+ Ok(flushed + median(&mut arm_sizes))
+ }
+
+ #[allow(clippy::too_many_arguments)]
+ fn write_match(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ ws1: Ws,
+ expr: &Expr<'_>,
+ arms: &'a [When<'_>],
+ ws2: Ws,
+ ) -> Result<usize, CompileError> {
+ self.flush_ws(ws1);
+ let flushed = self.write_buf_writable(buf)?;
+ let mut arm_sizes = Vec::new();
+
+ let expr_code = self.visit_expr_root(expr)?;
+ buf.writeln(&format!("match &{} {{", expr_code))?;
+
+ let mut arm_size = 0;
+ for (i, arm) in arms.iter().enumerate() {
+ let &(ws, ref target, ref body) = arm;
+ self.handle_ws(ws);
+
+ if i > 0 {
+ arm_sizes.push(arm_size + self.write_buf_writable(buf)?);
+
+ buf.writeln("}")?;
+ self.locals.pop();
+ }
+
+ self.locals.push();
+ self.visit_target(buf, true, true, target);
+ buf.writeln(" => {")?;
+
+ arm_size = self.handle(ctx, body, buf, AstLevel::Nested)?;
+ }
+
+ self.handle_ws(ws2);
+ arm_sizes.push(arm_size + self.write_buf_writable(buf)?);
+ buf.writeln("}")?;
+ self.locals.pop();
+
+ buf.writeln("}")?;
+
+ Ok(flushed + median(&mut arm_sizes))
+ }
+
+ #[allow(clippy::too_many_arguments)]
+ fn write_loop(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ loop_block: &'a Loop<'_>,
+ ) -> Result<usize, CompileError> {
+ self.handle_ws(loop_block.ws1);
+ self.locals.push();
+
+ let expr_code = self.visit_expr_root(&loop_block.iter)?;
+
+ let flushed = self.write_buf_writable(buf)?;
+ buf.writeln("{")?;
+ buf.writeln("let mut _did_loop = false;")?;
+ match loop_block.iter {
+ Expr::Range(_, _, _) => buf.writeln(&format!("let _iter = {};", expr_code)),
+ Expr::Array(..) => buf.writeln(&format!("let _iter = {}.iter();", expr_code)),
+ // If `iter` is a call then we assume it's something that returns
+ // an iterator. If not then the user can explicitly add the needed
+ // call without issues.
+ Expr::Call(..) | Expr::Index(..) => {
+ buf.writeln(&format!("let _iter = ({}).into_iter();", expr_code))
+ }
+ // If accessing `self` then it most likely needs to be
+ // borrowed, to prevent an attempt of moving.
+ _ if expr_code.starts_with("self.") => {
+ buf.writeln(&format!("let _iter = (&{}).into_iter();", expr_code))
+ }
+ // If accessing a field then it most likely needs to be
+ // borrowed, to prevent an attempt of moving.
+ Expr::Attr(..) => buf.writeln(&format!("let _iter = (&{}).into_iter();", expr_code)),
+ // Otherwise, we borrow `iter` assuming that it implements `IntoIterator`.
+ _ => buf.writeln(&format!("let _iter = ({}).into_iter();", expr_code)),
+ }?;
+ if let Some(cond) = &loop_block.cond {
+ self.locals.push();
+ buf.write("let _iter = _iter.filter(|");
+ self.visit_target(buf, true, true, &loop_block.var);
+ buf.write("| -> bool {");
+ self.visit_expr(buf, cond)?;
+ buf.writeln("});")?;
+ self.locals.pop();
+ }
+
+ self.locals.push();
+ buf.write("for (");
+ self.visit_target(buf, true, true, &loop_block.var);
+ buf.writeln(", _loop_item) in ::askama::helpers::TemplateLoop::new(_iter) {")?;
+
+ buf.writeln("_did_loop = true;")?;
+ let mut size_hint1 = self.handle(ctx, &loop_block.body, buf, AstLevel::Nested)?;
+ self.handle_ws(loop_block.ws2);
+ size_hint1 += self.write_buf_writable(buf)?;
+ self.locals.pop();
+ buf.writeln("}")?;
+
+ buf.writeln("if !_did_loop {")?;
+ self.locals.push();
+ let mut size_hint2 = self.handle(ctx, &loop_block.else_block, buf, AstLevel::Nested)?;
+ self.handle_ws(loop_block.ws3);
+ size_hint2 += self.write_buf_writable(buf)?;
+ self.locals.pop();
+ buf.writeln("}")?;
+
+ buf.writeln("}")?;
+
+ Ok(flushed + ((size_hint1 * 3) + size_hint2) / 2)
+ }
+
+ fn write_call(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ ws: Ws,
+ scope: Option<&str>,
+ name: &str,
+ args: &[Expr<'_>],
+ ) -> Result<usize, CompileError> {
+ if name == "super" {
+ return self.write_block(buf, None, ws);
+ }
+
+ let (def, own_ctx) = match scope {
+ Some(s) => {
+ let path = ctx.imports.get(s).ok_or_else(|| {
+ CompileError::from(format!("no import found for scope {:?}", s))
+ })?;
+ let mctx = self.contexts.get(path.as_path()).ok_or_else(|| {
+ CompileError::from(format!("context for {:?} not found", path))
+ })?;
+ let def = mctx.macros.get(name).ok_or_else(|| {
+ CompileError::from(format!("macro {:?} not found in scope {:?}", name, s))
+ })?;
+ (def, mctx)
+ }
+ None => {
+ let def = ctx
+ .macros
+ .get(name)
+ .ok_or_else(|| CompileError::from(format!("macro {:?} not found", name)))?;
+ (def, ctx)
+ }
+ };
+
+ self.flush_ws(ws); // Cannot handle_ws() here: whitespace from macro definition comes first
+ self.locals.push();
+ self.write_buf_writable(buf)?;
+ buf.writeln("{")?;
+ self.prepare_ws(def.ws1);
+
+ let mut names = Buffer::new(0);
+ let mut values = Buffer::new(0);
+ let mut is_first_variable = true;
+ for (i, arg) in def.args.iter().enumerate() {
+ let expr = args.get(i).ok_or_else(|| {
+ CompileError::from(format!("macro {:?} takes more than {} arguments", name, i))
+ })?;
+
+ match expr {
+ // If `expr` is already a form of variable then
+ // don't reintroduce a new variable. This is
+ // to avoid moving non-copyable values.
+ Expr::Var(name) => {
+ let var = self.locals.resolve_or_self(name);
+ self.locals.insert(arg, LocalMeta::with_ref(var));
+ }
+ Expr::Attr(obj, attr) => {
+ let mut attr_buf = Buffer::new(0);
+ self.visit_attr(&mut attr_buf, obj, attr)?;
+
+ let var = self.locals.resolve(&attr_buf.buf).unwrap_or(attr_buf.buf);
+ self.locals.insert(arg, LocalMeta::with_ref(var));
+ }
+ // Everything else still needs to become variables,
+ // to avoid having the same logic be executed
+ // multiple times, e.g. in the case of macro
+ // parameters being used multiple times.
+ _ => {
+ if is_first_variable {
+ is_first_variable = false
+ } else {
+ names.write(", ");
+ values.write(", ");
+ }
+ names.write(arg);
+
+ values.write("(");
+ values.write(&self.visit_expr_root(expr)?);
+ values.write(")");
+ self.locals.insert_with_default(arg);
+ }
+ }
+ }
+
+ debug_assert_eq!(names.buf.is_empty(), values.buf.is_empty());
+ if !names.buf.is_empty() {
+ buf.writeln(&format!("let ({}) = ({});", names.buf, values.buf))?;
+ }
+
+ let mut size_hint = self.handle(own_ctx, &def.nodes, buf, AstLevel::Nested)?;
+
+ self.flush_ws(def.ws2);
+ size_hint += self.write_buf_writable(buf)?;
+ buf.writeln("}")?;
+ self.locals.pop();
+ self.prepare_ws(ws);
+ Ok(size_hint)
+ }
+
+ fn handle_include(
+ &mut self,
+ ctx: &'a Context<'_>,
+ buf: &mut Buffer,
+ ws: Ws,
+ path: &str,
+ ) -> Result<usize, CompileError> {
+ self.flush_ws(ws);
+ self.write_buf_writable(buf)?;
+ let path = self
+ .input
+ .config
+ .find_template(path, Some(&self.input.path))?;
+ let src = get_template_source(&path)?;
+ let nodes = parse(&src, self.input.syntax)?;
+
+ // Make sure the compiler understands that the generated code depends on the template file.
+ {
+ let path = path.to_str().unwrap();
+ buf.writeln(
+ &quote! {
+ include_bytes!(#path);
+ }
+ .to_string(),
+ )?;
+ }
+
+ let size_hint = {
+ // Since nodes must not outlive the Generator, we instantiate
+ // a nested Generator here to handle the include's nodes.
+ let mut gen = self.child();
+ let mut size_hint = gen.handle(ctx, &nodes, buf, AstLevel::Nested)?;
+ size_hint += gen.write_buf_writable(buf)?;
+ size_hint
+ };
+ self.prepare_ws(ws);
+ Ok(size_hint)
+ }
+
+ fn write_let_decl(
+ &mut self,
+ buf: &mut Buffer,
+ ws: Ws,
+ var: &'a Target<'_>,
+ ) -> Result<(), CompileError> {
+ self.handle_ws(ws);
+ self.write_buf_writable(buf)?;
+ buf.write("let ");
+ self.visit_target(buf, false, true, var);
+ buf.writeln(";")
+ }
+
+ fn is_shadowing_variable(&self, var: &Target<'a>) -> Result<bool, CompileError> {
+ match var {
+ Target::Name(name) => {
+ let name = normalize_identifier(name);
+ match self.locals.get(&name) {
+ // declares a new variable
+ None => Ok(false),
+ // an initialized variable gets shadowed
+ Some(meta) if meta.initialized => Ok(true),
+ // initializes a variable that was introduced in a LetDecl before
+ _ => Ok(false),
+ }
+ }
+ Target::Tuple(_, targets) => {
+ for target in targets {
+ match self.is_shadowing_variable(target) {
+ Ok(false) => continue,
+ outcome => return outcome,
+ }
+ }
+ Ok(false)
+ }
+ Target::Struct(_, named_targets) => {
+ for (_, target) in named_targets {
+ match self.is_shadowing_variable(target) {
+ Ok(false) => continue,
+ outcome => return outcome,
+ }
+ }
+ Ok(false)
+ }
+ _ => Err("literals are not allowed on the left-hand side of an assignment".into()),
+ }
+ }
+
+ fn write_let(
+ &mut self,
+ buf: &mut Buffer,
+ ws: Ws,
+ var: &'a Target<'_>,
+ val: &Expr<'_>,
+ ) -> Result<(), CompileError> {
+ self.handle_ws(ws);
+ let mut expr_buf = Buffer::new(0);
+ self.visit_expr(&mut expr_buf, val)?;
+
+ let shadowed = self.is_shadowing_variable(var)?;
+ if shadowed {
+ // Need to flush the buffer if the variable is being shadowed,
+ // to ensure the old variable is used.
+ self.write_buf_writable(buf)?;
+ }
+ if shadowed
+ || !matches!(var, &Target::Name(_))
+ || matches!(var, Target::Name(name) if self.locals.get(name).is_none())
+ {
+ buf.write("let ");
+ }
+
+ self.visit_target(buf, true, true, var);
+ buf.writeln(&format!(" = {};", &expr_buf.buf))
+ }
+
+ // If `name` is `Some`, this is a call to a block definition, and we have to find
+ // the first block for that name from the ancestry chain. If name is `None`, this
+ // is from a `super()` call, and we can get the name from `self.super_block`.
+ fn write_block(
+ &mut self,
+ buf: &mut Buffer,
+ name: Option<&'a str>,
+ outer: Ws,
+ ) -> Result<usize, CompileError> {
+ // Flush preceding whitespace according to the outer WS spec
+ self.flush_ws(outer);
+
+ let prev_block = self.super_block;
+ let cur = match (name, prev_block) {
+ // The top-level context contains a block definition
+ (Some(cur_name), None) => (cur_name, 0),
+ // A block definition contains a block definition of the same name
+ (Some(cur_name), Some((prev_name, _))) if cur_name == prev_name => {
+ return Err(format!("cannot define recursive blocks ({})", cur_name).into());
+ }
+ // A block definition contains a definition of another block
+ (Some(cur_name), Some((_, _))) => (cur_name, 0),
+ // `super()` was called inside a block
+ (None, Some((prev_name, gen))) => (prev_name, gen + 1),
+ // `super()` is called from outside a block
+ (None, None) => return Err("cannot call 'super()' outside block".into()),
+ };
+ self.super_block = Some(cur);
+
+ // Get the block definition from the heritage chain
+ let heritage = self
+ .heritage
+ .as_ref()
+ .ok_or_else(|| CompileError::from("no block ancestors available"))?;
+ let (ctx, def) = heritage.blocks[cur.0].get(cur.1).ok_or_else(|| {
+ CompileError::from(match name {
+ None => format!("no super() block found for block '{}'", cur.0),
+ Some(name) => format!("no block found for name '{}'", name),
+ })
+ })?;
+
+ // Get the nodes and whitespace suppression data from the block definition
+ let (ws1, nodes, ws2) = if let Node::BlockDef(ws1, _, nodes, ws2) = def {
+ (ws1, nodes, ws2)
+ } else {
+ unreachable!()
+ };
+
+ // Handle inner whitespace suppression spec and process block nodes
+ self.prepare_ws(*ws1);
+ self.locals.push();
+ let size_hint = self.handle(ctx, nodes, buf, AstLevel::Block)?;
+
+ if !self.locals.is_current_empty() {
+ // Need to flush the buffer before popping the variable stack
+ self.write_buf_writable(buf)?;
+ }
+
+ self.locals.pop();
+ self.flush_ws(*ws2);
+
+ // Restore original block context and set whitespace suppression for
+ // succeeding whitespace according to the outer WS spec
+ self.super_block = prev_block;
+ self.prepare_ws(outer);
+ Ok(size_hint)
+ }
+
+ fn write_expr(&mut self, ws: Ws, s: &'a Expr<'a>) {
+ self.handle_ws(ws);
+ self.buf_writable.push(Writable::Expr(s));
+ }
+
+ // Write expression buffer and empty
+ fn write_buf_writable(&mut self, buf: &mut Buffer) -> Result<usize, CompileError> {
+ if self.buf_writable.is_empty() {
+ return Ok(0);
+ }
+
+ if self
+ .buf_writable
+ .iter()
+ .all(|w| matches!(w, Writable::Lit(_)))
+ {
+ let mut buf_lit = Buffer::new(0);
+ for s in mem::take(&mut self.buf_writable) {
+ if let Writable::Lit(s) = s {
+ buf_lit.write(s);
+ };
+ }
+ buf.writeln(&format!("writer.write_str({:#?})?;", &buf_lit.buf))?;
+ return Ok(buf_lit.buf.len());
+ }
+
+ let mut size_hint = 0;
+ let mut buf_format = Buffer::new(0);
+ let mut buf_expr = Buffer::new(buf.indent + 1);
+ let mut expr_cache = HashMap::with_capacity(self.buf_writable.len());
+ for s in mem::take(&mut self.buf_writable) {
+ match s {
+ Writable::Lit(s) => {
+ buf_format.write(&s.replace('{', "{{").replace('}', "}}"));
+ size_hint += s.len();
+ }
+ Writable::Expr(s) => {
+ use self::DisplayWrap::*;
+ let mut expr_buf = Buffer::new(0);
+ let wrapped = self.visit_expr(&mut expr_buf, s)?;
+ let expression = match wrapped {
+ Wrapped => expr_buf.buf,
+ Unwrapped => format!(
+ "::askama::MarkupDisplay::new_unsafe(&({}), {})",
+ expr_buf.buf, self.input.escaper
+ ),
+ };
+
+ use std::collections::hash_map::Entry;
+ let id = match expr_cache.entry(expression.clone()) {
+ Entry::Occupied(e) => *e.get(),
+ Entry::Vacant(e) => {
+ let id = self.named;
+ self.named += 1;
+
+ buf_expr.write(&format!("expr{} = ", id));
+ buf_expr.write("&");
+ buf_expr.write(&expression);
+ buf_expr.writeln(",")?;
+
+ e.insert(id);
+ id
+ }
+ };
+
+ buf_format.write(&format!("{{expr{}}}", id));
+ size_hint += 3;
+ }
+ }
+ }
+
+ buf.writeln("::std::write!(")?;
+ buf.indent();
+ buf.writeln("writer,")?;
+ buf.writeln(&format!("{:#?},", &buf_format.buf))?;
+ buf.writeln(buf_expr.buf.trim())?;
+ buf.dedent()?;
+ buf.writeln(")?;")?;
+ Ok(size_hint)
+ }
+
+ fn visit_lit(&mut self, lws: &'a str, val: &'a str, rws: &'a str) {
+ assert!(self.next_ws.is_none());
+ if !lws.is_empty() {
+ match self.skip_ws {
+ WhitespaceHandling::Suppress => {
+ self.skip_ws = WhitespaceHandling::Preserve;
+ }
+ _ if val.is_empty() => {
+ assert!(rws.is_empty());
+ self.next_ws = Some(lws);
+ }
+ WhitespaceHandling::Preserve => self.buf_writable.push(Writable::Lit(lws)),
+ WhitespaceHandling::Minimize => {
+ self.buf_writable
+ .push(Writable::Lit(match lws.contains('\n') {
+ true => "\n",
+ false => " ",
+ }))
+ }
+ }
+ }
+
+ if !val.is_empty() {
+ self.buf_writable.push(Writable::Lit(val));
+ }
+
+ if !rws.is_empty() {
+ self.next_ws = Some(rws);
+ }
+ }
+
+ fn write_comment(&mut self, ws: Ws) {
+ self.handle_ws(ws);
+ }
+
+ /* Visitor methods for expression types */
+
+ fn visit_expr_root(&mut self, expr: &Expr<'_>) -> Result<String, CompileError> {
+ let mut buf = Buffer::new(0);
+ self.visit_expr(&mut buf, expr)?;
+ Ok(buf.buf)
+ }
+
+ fn visit_expr(
+ &mut self,
+ buf: &mut Buffer,
+ expr: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ Ok(match *expr {
+ Expr::BoolLit(s) => self.visit_bool_lit(buf, s),
+ Expr::NumLit(s) => self.visit_num_lit(buf, s),
+ Expr::StrLit(s) => self.visit_str_lit(buf, s),
+ Expr::CharLit(s) => self.visit_char_lit(buf, s),
+ Expr::Var(s) => self.visit_var(buf, s),
+ Expr::Path(ref path) => self.visit_path(buf, path),
+ Expr::Array(ref elements) => self.visit_array(buf, elements)?,
+ Expr::Attr(ref obj, name) => self.visit_attr(buf, obj, name)?,
+ Expr::Index(ref obj, ref key) => self.visit_index(buf, obj, key)?,
+ Expr::Filter(name, ref args) => self.visit_filter(buf, name, args)?,
+ Expr::Unary(op, ref inner) => self.visit_unary(buf, op, inner)?,
+ Expr::BinOp(op, ref left, ref right) => self.visit_binop(buf, op, left, right)?,
+ Expr::Range(op, ref left, ref right) => self.visit_range(buf, op, left, right)?,
+ Expr::Group(ref inner) => self.visit_group(buf, inner)?,
+ Expr::Call(ref obj, ref args) => self.visit_call(buf, obj, args)?,
+ Expr::RustMacro(name, args) => self.visit_rust_macro(buf, name, args),
+ Expr::Try(ref expr) => self.visit_try(buf, expr.as_ref())?,
+ Expr::Tuple(ref exprs) => self.visit_tuple(buf, exprs)?,
+ })
+ }
+
+ fn visit_try(
+ &mut self,
+ buf: &mut Buffer,
+ expr: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write("::core::result::Result::map_err(");
+ self.visit_expr(buf, expr)?;
+ buf.write(", |err| ::askama::shared::Error::Custom(::core::convert::Into::into(err)))?");
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_rust_macro(&mut self, buf: &mut Buffer, name: &str, args: &str) -> DisplayWrap {
+ buf.write(name);
+ buf.write("!(");
+ buf.write(args);
+ buf.write(")");
+
+ DisplayWrap::Unwrapped
+ }
+
+ #[cfg(not(feature = "markdown"))]
+ fn _visit_markdown_filter(
+ &mut self,
+ _buf: &mut Buffer,
+ _args: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ Err("the `markdown` filter requires the `markdown` feature to be enabled".into())
+ }
+
+ #[cfg(feature = "markdown")]
+ fn _visit_markdown_filter(
+ &mut self,
+ buf: &mut Buffer,
+ args: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ let (md, options) = match args {
+ [md] => (md, None),
+ [md, options] => (md, Some(options)),
+ _ => return Err("markdown filter expects no more than one option argument".into()),
+ };
+
+ buf.write(&format!(
+ "::askama::filters::markdown({}, ",
+ self.input.escaper
+ ));
+ self.visit_expr(buf, md)?;
+ match options {
+ Some(options) => {
+ buf.write(", ::core::option::Option::Some(");
+ self.visit_expr(buf, options)?;
+ buf.write(")");
+ }
+ None => buf.write(", ::core::option::Option::None"),
+ }
+ buf.write(")?");
+
+ Ok(DisplayWrap::Wrapped)
+ }
+
+ fn visit_filter(
+ &mut self,
+ buf: &mut Buffer,
+ mut name: &str,
+ args: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ if matches!(name, "escape" | "e") {
+ self._visit_escape_filter(buf, args)?;
+ return Ok(DisplayWrap::Wrapped);
+ } else if name == "format" {
+ self._visit_format_filter(buf, args)?;
+ return Ok(DisplayWrap::Unwrapped);
+ } else if name == "fmt" {
+ self._visit_fmt_filter(buf, args)?;
+ return Ok(DisplayWrap::Unwrapped);
+ } else if name == "join" {
+ self._visit_join_filter(buf, args)?;
+ return Ok(DisplayWrap::Unwrapped);
+ } else if name == "markdown" {
+ return self._visit_markdown_filter(buf, args);
+ }
+
+ if name == "tojson" {
+ name = "json";
+ }
+
+ #[cfg(not(feature = "serde-json"))]
+ if name == "json" {
+ return Err("the `json` filter requires the `serde-json` feature to be enabled".into());
+ }
+ #[cfg(not(feature = "serde-yaml"))]
+ if name == "yaml" {
+ return Err("the `yaml` filter requires the `serde-yaml` feature to be enabled".into());
+ }
+
+ const FILTERS: [&str; 2] = ["safe", "yaml"];
+ if FILTERS.contains(&name) {
+ buf.write(&format!(
+ "::askama::filters::{}({}, ",
+ name, self.input.escaper
+ ));
+ } else if crate::BUILT_IN_FILTERS.contains(&name) {
+ buf.write(&format!("::askama::filters::{}(", name));
+ } else {
+ buf.write(&format!("filters::{}(", name));
+ }
+
+ self._visit_args(buf, args)?;
+ buf.write(")?");
+ Ok(match FILTERS.contains(&name) {
+ true => DisplayWrap::Wrapped,
+ false => DisplayWrap::Unwrapped,
+ })
+ }
+
+ fn _visit_escape_filter(
+ &mut self,
+ buf: &mut Buffer,
+ args: &[Expr<'_>],
+ ) -> Result<(), CompileError> {
+ if args.len() > 2 {
+ return Err("only two arguments allowed to escape filter".into());
+ }
+ let opt_escaper = match args.get(1) {
+ Some(Expr::StrLit(name)) => Some(*name),
+ Some(_) => return Err("invalid escaper type for escape filter".into()),
+ None => None,
+ };
+ let escaper = match opt_escaper {
+ Some(name) => self
+ .input
+ .config
+ .escapers
+ .iter()
+ .find_map(|(escapers, escaper)| escapers.contains(name).then(|| escaper))
+ .ok_or_else(|| CompileError::from("invalid escaper for escape filter"))?,
+ None => self.input.escaper,
+ };
+ buf.write("::askama::filters::escape(");
+ buf.write(escaper);
+ buf.write(", ");
+ self._visit_args(buf, &args[..1])?;
+ buf.write(")?");
+ Ok(())
+ }
+
+ fn _visit_format_filter(
+ &mut self,
+ buf: &mut Buffer,
+ args: &[Expr<'_>],
+ ) -> Result<(), CompileError> {
+ buf.write("format!(");
+ if let Some(Expr::StrLit(v)) = args.first() {
+ self.visit_str_lit(buf, v);
+ if args.len() > 1 {
+ buf.write(", ");
+ }
+ } else {
+ return Err("invalid expression type for format filter".into());
+ }
+ self._visit_args(buf, &args[1..])?;
+ buf.write(")");
+ Ok(())
+ }
+
+ fn _visit_fmt_filter(
+ &mut self,
+ buf: &mut Buffer,
+ args: &[Expr<'_>],
+ ) -> Result<(), CompileError> {
+ buf.write("format!(");
+ if let Some(Expr::StrLit(v)) = args.get(1) {
+ self.visit_str_lit(buf, v);
+ buf.write(", ");
+ } else {
+ return Err("invalid expression type for fmt filter".into());
+ }
+ self._visit_args(buf, &args[0..1])?;
+ if args.len() > 2 {
+ return Err("only two arguments allowed to fmt filter".into());
+ }
+ buf.write(")");
+ Ok(())
+ }
+
+ // Force type coercion on first argument to `join` filter (see #39).
+ fn _visit_join_filter(
+ &mut self,
+ buf: &mut Buffer,
+ args: &[Expr<'_>],
+ ) -> Result<(), CompileError> {
+ buf.write("::askama::filters::join((&");
+ for (i, arg) in args.iter().enumerate() {
+ if i > 0 {
+ buf.write(", &");
+ }
+ self.visit_expr(buf, arg)?;
+ if i == 0 {
+ buf.write(").into_iter()");
+ }
+ }
+ buf.write(")?");
+ Ok(())
+ }
+
+ fn _visit_args(&mut self, buf: &mut Buffer, args: &[Expr<'_>]) -> Result<(), CompileError> {
+ if args.is_empty() {
+ return Ok(());
+ }
+
+ for (i, arg) in args.iter().enumerate() {
+ if i > 0 {
+ buf.write(", ");
+ }
+
+ let borrow = !arg.is_copyable();
+ if borrow {
+ buf.write("&(");
+ }
+
+ match arg {
+ Expr::Call(left, _) if !matches!(left.as_ref(), Expr::Path(_)) => {
+ buf.writeln("{")?;
+ self.visit_expr(buf, arg)?;
+ buf.writeln("}")?;
+ }
+ _ => {
+ self.visit_expr(buf, arg)?;
+ }
+ }
+
+ if borrow {
+ buf.write(")");
+ }
+ }
+ Ok(())
+ }
+
+ fn visit_attr(
+ &mut self,
+ buf: &mut Buffer,
+ obj: &Expr<'_>,
+ attr: &str,
+ ) -> Result<DisplayWrap, CompileError> {
+ if let Expr::Var(name) = *obj {
+ if name == "loop" {
+ if attr == "index" {
+ buf.write("(_loop_item.index + 1)");
+ return Ok(DisplayWrap::Unwrapped);
+ } else if attr == "index0" {
+ buf.write("_loop_item.index");
+ return Ok(DisplayWrap::Unwrapped);
+ } else if attr == "first" {
+ buf.write("_loop_item.first");
+ return Ok(DisplayWrap::Unwrapped);
+ } else if attr == "last" {
+ buf.write("_loop_item.last");
+ return Ok(DisplayWrap::Unwrapped);
+ } else {
+ return Err("unknown loop variable".into());
+ }
+ }
+ }
+ self.visit_expr(buf, obj)?;
+ buf.write(&format!(".{}", normalize_identifier(attr)));
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_index(
+ &mut self,
+ buf: &mut Buffer,
+ obj: &Expr<'_>,
+ key: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write("&");
+ self.visit_expr(buf, obj)?;
+ buf.write("[");
+ self.visit_expr(buf, key)?;
+ buf.write("]");
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_call(
+ &mut self,
+ buf: &mut Buffer,
+ left: &Expr<'_>,
+ args: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ match left {
+ Expr::Attr(left, method) if **left == Expr::Var("loop") => match *method {
+ "cycle" => match args {
+ [arg] => {
+ if matches!(arg, Expr::Array(arr) if arr.is_empty()) {
+ return Err("loop.cycle(…) cannot use an empty array".into());
+ }
+ buf.write("({");
+ buf.write("let _cycle = &(");
+ self.visit_expr(buf, arg)?;
+ buf.writeln(");")?;
+ buf.writeln("let _len = _cycle.len();")?;
+ buf.writeln("if _len == 0 {")?;
+ buf.writeln("return ::core::result::Result::Err(::askama::Error::Fmt(::core::fmt::Error));")?;
+ buf.writeln("}")?;
+ buf.writeln("_cycle[_loop_item.index % _len]")?;
+ buf.writeln("})")?;
+ }
+ _ => return Err("loop.cycle(…) expects exactly one argument".into()),
+ },
+ s => return Err(format!("unknown loop method: {:?}", s).into()),
+ },
+ left => {
+ match left {
+ Expr::Var(name) => match self.locals.resolve(name) {
+ Some(resolved) => buf.write(&resolved),
+ None => buf.write(&format!("(&self.{})", normalize_identifier(name))),
+ },
+ left => {
+ self.visit_expr(buf, left)?;
+ }
+ }
+
+ buf.write("(");
+ self._visit_args(buf, args)?;
+ buf.write(")");
+ }
+ }
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_unary(
+ &mut self,
+ buf: &mut Buffer,
+ op: &str,
+ inner: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write(op);
+ self.visit_expr(buf, inner)?;
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_range(
+ &mut self,
+ buf: &mut Buffer,
+ op: &str,
+ left: &Option<Box<Expr<'_>>>,
+ right: &Option<Box<Expr<'_>>>,
+ ) -> Result<DisplayWrap, CompileError> {
+ if let Some(left) = left {
+ self.visit_expr(buf, left)?;
+ }
+ buf.write(op);
+ if let Some(right) = right {
+ self.visit_expr(buf, right)?;
+ }
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_binop(
+ &mut self,
+ buf: &mut Buffer,
+ op: &str,
+ left: &Expr<'_>,
+ right: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ self.visit_expr(buf, left)?;
+ buf.write(&format!(" {} ", op));
+ self.visit_expr(buf, right)?;
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_group(
+ &mut self,
+ buf: &mut Buffer,
+ inner: &Expr<'_>,
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write("(");
+ self.visit_expr(buf, inner)?;
+ buf.write(")");
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_tuple(
+ &mut self,
+ buf: &mut Buffer,
+ exprs: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write("(");
+ for (index, expr) in exprs.iter().enumerate() {
+ if index > 0 {
+ buf.write(" ");
+ }
+ self.visit_expr(buf, expr)?;
+ buf.write(",");
+ }
+ buf.write(")");
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_array(
+ &mut self,
+ buf: &mut Buffer,
+ elements: &[Expr<'_>],
+ ) -> Result<DisplayWrap, CompileError> {
+ buf.write("[");
+ for (i, el) in elements.iter().enumerate() {
+ if i > 0 {
+ buf.write(", ");
+ }
+ self.visit_expr(buf, el)?;
+ }
+ buf.write("]");
+ Ok(DisplayWrap::Unwrapped)
+ }
+
+ fn visit_path(&mut self, buf: &mut Buffer, path: &[&str]) -> DisplayWrap {
+ for (i, part) in path.iter().enumerate() {
+ if i > 0 {
+ buf.write("::");
+ }
+ buf.write(part);
+ }
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_var(&mut self, buf: &mut Buffer, s: &str) -> DisplayWrap {
+ if s == "self" {
+ buf.write(s);
+ return DisplayWrap::Unwrapped;
+ }
+
+ buf.write(normalize_identifier(&self.locals.resolve_or_self(s)));
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_bool_lit(&mut self, buf: &mut Buffer, s: &str) -> DisplayWrap {
+ buf.write(s);
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_str_lit(&mut self, buf: &mut Buffer, s: &str) -> DisplayWrap {
+ buf.write(&format!("\"{}\"", s));
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_char_lit(&mut self, buf: &mut Buffer, s: &str) -> DisplayWrap {
+ buf.write(&format!("'{}'", s));
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_num_lit(&mut self, buf: &mut Buffer, s: &str) -> DisplayWrap {
+ buf.write(s);
+ DisplayWrap::Unwrapped
+ }
+
+ fn visit_target(
+ &mut self,
+ buf: &mut Buffer,
+ initialized: bool,
+ first_level: bool,
+ target: &Target<'a>,
+ ) {
+ match target {
+ Target::Name("_") => {
+ buf.write("_");
+ }
+ Target::Name(name) => {
+ let name = normalize_identifier(name);
+ match initialized {
+ true => self.locals.insert(name, LocalMeta::initialized()),
+ false => self.locals.insert_with_default(name),
+ }
+ buf.write(name);
+ }
+ Target::Tuple(path, targets) => {
+ buf.write(&path.join("::"));
+ buf.write("(");
+ for target in targets {
+ self.visit_target(buf, initialized, false, target);
+ buf.write(",");
+ }
+ buf.write(")");
+ }
+ Target::Struct(path, targets) => {
+ buf.write(&path.join("::"));
+ buf.write(" { ");
+ for (name, target) in targets {
+ buf.write(normalize_identifier(name));
+ buf.write(": ");
+ self.visit_target(buf, initialized, false, target);
+ buf.write(",");
+ }
+ buf.write(" }");
+ }
+ Target::Path(path) => {
+ self.visit_path(buf, path);
+ }
+ Target::StrLit(s) => {
+ if first_level {
+ buf.write("&");
+ }
+ self.visit_str_lit(buf, s);
+ }
+ Target::NumLit(s) => {
+ if first_level {
+ buf.write("&");
+ }
+ self.visit_num_lit(buf, s);
+ }
+ Target::CharLit(s) => {
+ if first_level {
+ buf.write("&");
+ }
+ self.visit_char_lit(buf, s);
+ }
+ Target::BoolLit(s) => {
+ if first_level {
+ buf.write("&");
+ }
+ buf.write(s);
+ }
+ }
+ }
+
+ /* Helper methods for dealing with whitespace nodes */
+
+ // Combines `flush_ws()` and `prepare_ws()` to handle both trailing whitespace from the
+ // preceding literal and leading whitespace from the succeeding literal.
+ fn handle_ws(&mut self, ws: Ws) {
+ self.flush_ws(ws);
+ self.prepare_ws(ws);
+ }
+
+ fn should_trim_ws(&self, ws: Option<Whitespace>) -> WhitespaceHandling {
+ match ws {
+ Some(Whitespace::Suppress) => WhitespaceHandling::Suppress,
+ Some(Whitespace::Preserve) => WhitespaceHandling::Preserve,
+ Some(Whitespace::Minimize) => WhitespaceHandling::Minimize,
+ None => self.whitespace,
+ }
+ }
+
+ // If the previous literal left some trailing whitespace in `next_ws` and the
+ // prefix whitespace suppressor from the given argument, flush that whitespace.
+ // In either case, `next_ws` is reset to `None` (no trailing whitespace).
+ fn flush_ws(&mut self, ws: Ws) {
+ if self.next_ws.is_none() {
+ return;
+ }
+
+ // If `whitespace` is set to `suppress`, we keep the whitespace characters only if there is
+ // a `+` character.
+ match self.should_trim_ws(ws.0) {
+ WhitespaceHandling::Preserve => {
+ let val = self.next_ws.unwrap();
+ if !val.is_empty() {
+ self.buf_writable.push(Writable::Lit(val));
+ }
+ }
+ WhitespaceHandling::Minimize => {
+ let val = self.next_ws.unwrap();
+ if !val.is_empty() {
+ self.buf_writable
+ .push(Writable::Lit(match val.contains('\n') {
+ true => "\n",
+ false => " ",
+ }));
+ }
+ }
+ WhitespaceHandling::Suppress => {}
+ }
+ self.next_ws = None;
+ }
+
+ // Sets `skip_ws` to match the suffix whitespace suppressor from the given
+ // argument, to determine whether to suppress leading whitespace from the
+ // next literal.
+ fn prepare_ws(&mut self, ws: Ws) {
+ self.skip_ws = self.should_trim_ws(ws.1);
+ }
+}
+
+struct Buffer {
+ // The buffer to generate the code into
+ buf: String,
+ // The current level of indentation (in spaces)
+ indent: u8,
+ // Whether the output buffer is currently at the start of a line
+ start: bool,
+}
+
+impl Buffer {
+ fn new(indent: u8) -> Self {
+ Self {
+ buf: String::new(),
+ indent,
+ start: true,
+ }
+ }
+
+ fn writeln(&mut self, s: &str) -> Result<(), CompileError> {
+ if s == "}" {
+ self.dedent()?;
+ }
+ if !s.is_empty() {
+ self.write(s);
+ }
+ self.buf.push('\n');
+ if s.ends_with('{') {
+ self.indent();
+ }
+ self.start = true;
+ Ok(())
+ }
+
+ fn write(&mut self, s: &str) {
+ if self.start {
+ for _ in 0..(self.indent * 4) {
+ self.buf.push(' ');
+ }
+ self.start = false;
+ }
+ self.buf.push_str(s);
+ }
+
+ fn indent(&mut self) {
+ self.indent += 1;
+ }
+
+ fn dedent(&mut self) -> Result<(), CompileError> {
+ if self.indent == 0 {
+ return Err("dedent() called while indentation == 0".into());
+ }
+ self.indent -= 1;
+ Ok(())
+ }
+}
+
+#[derive(Clone, Default)]
+struct LocalMeta {
+ refs: Option<String>,
+ initialized: bool,
+}
+
+impl LocalMeta {
+ fn initialized() -> Self {
+ Self {
+ refs: None,
+ initialized: true,
+ }
+ }
+
+ fn with_ref(refs: String) -> Self {
+ Self {
+ refs: Some(refs),
+ initialized: true,
+ }
+ }
+}
+
+// type SetChain<'a, T> = MapChain<'a, T, ()>;
+
+#[derive(Debug)]
+struct MapChain<'a, K, V>
+where
+ K: cmp::Eq + hash::Hash,
+{
+ parent: Option<&'a MapChain<'a, K, V>>,
+ scopes: Vec<HashMap<K, V>>,
+}
+
+impl<'a, K: 'a, V: 'a> MapChain<'a, K, V>
+where
+ K: cmp::Eq + hash::Hash,
+{
+ fn new() -> MapChain<'a, K, V> {
+ MapChain {
+ parent: None,
+ scopes: vec![HashMap::new()],
+ }
+ }
+
+ fn with_parent<'p>(parent: &'p MapChain<'_, K, V>) -> MapChain<'p, K, V> {
+ MapChain {
+ parent: Some(parent),
+ scopes: vec![HashMap::new()],
+ }
+ }
+
+ /// Iterates the scopes in reverse and returns `Some(LocalMeta)`
+ /// from the first scope where `key` exists.
+ fn get(&self, key: &K) -> Option<&V> {
+ let scopes = self.scopes.iter().rev();
+ scopes
+ .filter_map(|set| set.get(key))
+ .next()
+ .or_else(|| self.parent.and_then(|set| set.get(key)))
+ }
+
+ fn is_current_empty(&self) -> bool {
+ self.scopes.last().unwrap().is_empty()
+ }
+
+ fn insert(&mut self, key: K, val: V) {
+ self.scopes.last_mut().unwrap().insert(key, val);
+
+ // Note that if `insert` returns `Some` then it implies
+ // an identifier is reused. For e.g. `{% macro f(a, a) %}`
+ // and `{% let (a, a) = ... %}` then this results in a
+ // generated template, which when compiled fails with the
+ // compile error "identifier `a` used more than once".
+ }
+
+ fn insert_with_default(&mut self, key: K)
+ where
+ V: Default,
+ {
+ self.insert(key, V::default());
+ }
+
+ fn push(&mut self) {
+ self.scopes.push(HashMap::new());
+ }
+
+ fn pop(&mut self) {
+ self.scopes.pop().unwrap();
+ assert!(!self.scopes.is_empty());
+ }
+}
+
+impl MapChain<'_, &str, LocalMeta> {
+ fn resolve(&self, name: &str) -> Option<String> {
+ let name = normalize_identifier(name);
+ self.get(&name).map(|meta| match &meta.refs {
+ Some(expr) => expr.clone(),
+ None => name.to_string(),
+ })
+ }
+
+ fn resolve_or_self(&self, name: &str) -> String {
+ let name = normalize_identifier(name);
+ self.resolve(name)
+ .unwrap_or_else(|| format!("self.{}", name))
+ }
+}
+
+fn median(sizes: &mut [usize]) -> usize {
+ sizes.sort_unstable();
+ if sizes.len() % 2 == 1 {
+ sizes[sizes.len() / 2]
+ } else {
+ (sizes[sizes.len() / 2 - 1] + sizes[sizes.len() / 2]) / 2
+ }
+}
+
+#[derive(Clone, PartialEq)]
+enum AstLevel {
+ Top,
+ Block,
+ Nested,
+}
+
+impl Copy for AstLevel {}
+
+#[derive(Clone)]
+enum DisplayWrap {
+ Wrapped,
+ Unwrapped,
+}
+
+impl Copy for DisplayWrap {}
+
+#[derive(Debug)]
+enum Writable<'a> {
+ Lit(&'a str),
+ Expr(&'a Expr<'a>),
+}
+
+// Identifiers to be replaced with raw identifiers, so as to avoid
+// collisions between template syntax and Rust's syntax. In particular
+// [Rust keywords](https://doc.rust-lang.org/reference/keywords.html)
+// should be replaced, since they're not reserved words in Askama
+// syntax but have a high probability of causing problems in the
+// generated code.
+//
+// This list excludes the Rust keywords *self*, *Self*, and *super*
+// because they are not allowed to be raw identifiers, and *loop*
+// because it's used something like a keyword in the template
+// language.
+static USE_RAW: [(&str, &str); 47] = [
+ ("as", "r#as"),
+ ("break", "r#break"),
+ ("const", "r#const"),
+ ("continue", "r#continue"),
+ ("crate", "r#crate"),
+ ("else", "r#else"),
+ ("enum", "r#enum"),
+ ("extern", "r#extern"),
+ ("false", "r#false"),
+ ("fn", "r#fn"),
+ ("for", "r#for"),
+ ("if", "r#if"),
+ ("impl", "r#impl"),
+ ("in", "r#in"),
+ ("let", "r#let"),
+ ("match", "r#match"),
+ ("mod", "r#mod"),
+ ("move", "r#move"),
+ ("mut", "r#mut"),
+ ("pub", "r#pub"),
+ ("ref", "r#ref"),
+ ("return", "r#return"),
+ ("static", "r#static"),
+ ("struct", "r#struct"),
+ ("trait", "r#trait"),
+ ("true", "r#true"),
+ ("type", "r#type"),
+ ("unsafe", "r#unsafe"),
+ ("use", "r#use"),
+ ("where", "r#where"),
+ ("while", "r#while"),
+ ("async", "r#async"),
+ ("await", "r#await"),
+ ("dyn", "r#dyn"),
+ ("abstract", "r#abstract"),
+ ("become", "r#become"),
+ ("box", "r#box"),
+ ("do", "r#do"),
+ ("final", "r#final"),
+ ("macro", "r#macro"),
+ ("override", "r#override"),
+ ("priv", "r#priv"),
+ ("typeof", "r#typeof"),
+ ("unsized", "r#unsized"),
+ ("virtual", "r#virtual"),
+ ("yield", "r#yield"),
+ ("try", "r#try"),
+];
+
+fn normalize_identifier(ident: &str) -> &str {
+ if let Some(word) = USE_RAW.iter().find(|x| x.0 == ident) {
+ word.1
+ } else {
+ ident
+ }
+}
diff --git a/askama_derive/src/heritage.rs b/askama_derive/src/heritage.rs
new file mode 100644
index 0000000..52c14a2
--- /dev/null
+++ b/askama_derive/src/heritage.rs
@@ -0,0 +1,126 @@
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+
+use crate::config::Config;
+use crate::parser::{Expr, Loop, Macro, Node};
+use crate::CompileError;
+
+pub(crate) struct Heritage<'a> {
+ pub(crate) root: &'a Context<'a>,
+ pub(crate) blocks: BlockAncestry<'a>,
+}
+
+impl Heritage<'_> {
+ pub(crate) fn new<'n, S: std::hash::BuildHasher>(
+ mut ctx: &'n Context<'n>,
+ contexts: &'n HashMap<&'n Path, Context<'n>, S>,
+ ) -> Heritage<'n> {
+ let mut blocks: BlockAncestry<'n> = ctx
+ .blocks
+ .iter()
+ .map(|(name, def)| (*name, vec![(ctx, *def)]))
+ .collect();
+
+ while let Some(ref path) = ctx.extends {
+ ctx = &contexts[path.as_path()];
+ for (name, def) in &ctx.blocks {
+ blocks.entry(name).or_insert_with(Vec::new).push((ctx, def));
+ }
+ }
+
+ Heritage { root: ctx, blocks }
+ }
+}
+
+type BlockAncestry<'a> = HashMap<&'a str, Vec<(&'a Context<'a>, &'a Node<'a>)>>;
+
+pub(crate) struct Context<'a> {
+ pub(crate) nodes: &'a [Node<'a>],
+ pub(crate) extends: Option<PathBuf>,
+ pub(crate) blocks: HashMap<&'a str, &'a Node<'a>>,
+ pub(crate) macros: HashMap<&'a str, &'a Macro<'a>>,
+ pub(crate) imports: HashMap<&'a str, PathBuf>,
+}
+
+impl Context<'_> {
+ pub(crate) fn new<'n>(
+ config: &Config<'_>,
+ path: &Path,
+ nodes: &'n [Node<'n>],
+ ) -> Result<Context<'n>, CompileError> {
+ let mut extends = None;
+ let mut blocks = Vec::new();
+ let mut macros = HashMap::new();
+ let mut imports = HashMap::new();
+ let mut nested = vec![nodes];
+ let mut top = true;
+
+ while let Some(nodes) = nested.pop() {
+ for n in nodes {
+ match n {
+ Node::Extends(Expr::StrLit(extends_path)) if top => match extends {
+ Some(_) => return Err("multiple extend blocks found".into()),
+ None => {
+ extends = Some(config.find_template(extends_path, Some(path))?);
+ }
+ },
+ Node::Macro(name, m) if top => {
+ macros.insert(*name, m);
+ }
+ Node::Import(_, import_path, scope) if top => {
+ let path = config.find_template(import_path, Some(path))?;
+ imports.insert(*scope, path);
+ }
+ Node::Extends(_) | Node::Macro(_, _) | Node::Import(_, _, _) if !top => {
+ return Err(
+ "extends, macro or import blocks not allowed below top level".into(),
+ );
+ }
+ def @ Node::BlockDef(_, _, _, _) => {
+ blocks.push(def);
+ if let Node::BlockDef(_, _, nodes, _) = def {
+ nested.push(nodes);
+ }
+ }
+ Node::Cond(branches, _) => {
+ for (_, _, nodes) in branches {
+ nested.push(nodes);
+ }
+ }
+ Node::Loop(Loop {
+ body, else_block, ..
+ }) => {
+ nested.push(body);
+ nested.push(else_block);
+ }
+ Node::Match(_, _, arms, _) => {
+ for (_, _, arm) in arms {
+ nested.push(arm);
+ }
+ }
+ _ => {}
+ }
+ }
+ top = false;
+ }
+
+ let blocks: HashMap<_, _> = blocks
+ .iter()
+ .map(|def| {
+ if let Node::BlockDef(_, name, _, _) = def {
+ (*name, *def)
+ } else {
+ unreachable!()
+ }
+ })
+ .collect();
+
+ Ok(Context {
+ nodes,
+ extends,
+ blocks,
+ macros,
+ imports,
+ })
+ }
+}
diff --git a/askama_derive/src/input.rs b/askama_derive/src/input.rs
new file mode 100644
index 0000000..c09f3d0
--- /dev/null
+++ b/askama_derive/src/input.rs
@@ -0,0 +1,255 @@
+use crate::config::{Config, Syntax};
+use crate::generator::TemplateArgs;
+use crate::CompileError;
+
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+
+use mime::Mime;
+
+pub(crate) struct TemplateInput<'a> {
+ pub(crate) ast: &'a syn::DeriveInput,
+ pub(crate) config: &'a Config<'a>,
+ pub(crate) syntax: &'a Syntax<'a>,
+ pub(crate) source: Source,
+ pub(crate) print: Print,
+ pub(crate) escaper: &'a str,
+ pub(crate) ext: Option<String>,
+ pub(crate) mime_type: String,
+ pub(crate) parent: Option<&'a syn::Type>,
+ pub(crate) path: PathBuf,
+}
+
+impl TemplateInput<'_> {
+ /// Extract the template metadata from the `DeriveInput` structure. This
+ /// mostly recovers the data for the `TemplateInput` fields from the
+ /// `template()` attribute list fields; it also finds the of the `_parent`
+ /// field, if any.
+ pub(crate) fn new<'n>(
+ ast: &'n syn::DeriveInput,
+ config: &'n Config<'_>,
+ args: TemplateArgs,
+ ) -> Result<TemplateInput<'n>, CompileError> {
+ let TemplateArgs {
+ source,
+ print,
+ escaping,
+ ext,
+ syntax,
+ ..
+ } = args;
+
+ // Validate the `source` and `ext` value together, since they are
+ // related. In case `source` was used instead of `path`, the value
+ // of `ext` is merged into a synthetic `path` value here.
+ let source = source.expect("template path or source not found in attributes");
+ let path = match (&source, &ext) {
+ (&Source::Path(ref path), _) => config.find_template(path, None)?,
+ (&Source::Source(_), Some(ext)) => PathBuf::from(format!("{}.{}", ast.ident, ext)),
+ (&Source::Source(_), None) => {
+ return Err("must include 'ext' attribute when using 'source' attribute".into())
+ }
+ };
+
+ // Check to see if a `_parent` field was defined on the context
+ // struct, and store the type for it for use in the code generator.
+ let parent = match ast.data {
+ syn::Data::Struct(syn::DataStruct {
+ fields: syn::Fields::Named(ref fields),
+ ..
+ }) => fields
+ .named
+ .iter()
+ .find(|f| f.ident.as_ref().filter(|name| *name == "_parent").is_some())
+ .map(|f| &f.ty),
+ _ => None,
+ };
+
+ if parent.is_some() {
+ eprint!(
+ " --> in struct {}\n = use of deprecated field '_parent'\n",
+ ast.ident
+ );
+ }
+
+ // Validate syntax
+ let syntax = syntax.map_or_else(
+ || Ok(config.syntaxes.get(config.default_syntax).unwrap()),
+ |s| {
+ config
+ .syntaxes
+ .get(&s)
+ .ok_or_else(|| CompileError::from(format!("attribute syntax {} not exist", s)))
+ },
+ )?;
+
+ // Match extension against defined output formats
+
+ let escaping = escaping.unwrap_or_else(|| {
+ path.extension()
+ .map(|s| s.to_str().unwrap())
+ .unwrap_or("")
+ .to_string()
+ });
+
+ let mut escaper = None;
+ for (extensions, path) in &config.escapers {
+ if extensions.contains(&escaping) {
+ escaper = Some(path);
+ break;
+ }
+ }
+
+ let escaper = escaper.ok_or_else(|| {
+ CompileError::from(format!("no escaper defined for extension '{}'", escaping))
+ })?;
+
+ let mime_type =
+ extension_to_mime_type(ext_default_to_path(ext.as_deref(), &path).unwrap_or("txt"))
+ .to_string();
+
+ Ok(TemplateInput {
+ ast,
+ config,
+ syntax,
+ source,
+ print,
+ escaper,
+ ext,
+ mime_type,
+ parent,
+ path,
+ })
+ }
+
+ #[inline]
+ pub(crate) fn extension(&self) -> Option<&str> {
+ ext_default_to_path(self.ext.as_deref(), &self.path)
+ }
+}
+
+#[inline]
+fn ext_default_to_path<'a>(ext: Option<&'a str>, path: &'a Path) -> Option<&'a str> {
+ ext.or_else(|| extension(path))
+}
+
+fn extension(path: &Path) -> Option<&str> {
+ let ext = path.extension().map(|s| s.to_str().unwrap())?;
+
+ const JINJA_EXTENSIONS: [&str; 3] = ["j2", "jinja", "jinja2"];
+ if JINJA_EXTENSIONS.contains(&ext) {
+ Path::new(path.file_stem().unwrap())
+ .extension()
+ .map(|s| s.to_str().unwrap())
+ .or(Some(ext))
+ } else {
+ Some(ext)
+ }
+}
+
+pub(crate) enum Source {
+ Path(String),
+ Source(String),
+}
+
+#[derive(PartialEq)]
+pub(crate) enum Print {
+ All,
+ Ast,
+ Code,
+ None,
+}
+
+impl FromStr for Print {
+ type Err = CompileError;
+
+ fn from_str(s: &str) -> Result<Print, Self::Err> {
+ use self::Print::*;
+ Ok(match s {
+ "all" => All,
+ "ast" => Ast,
+ "code" => Code,
+ "none" => None,
+ v => return Err(format!("invalid value for print option: {}", v,).into()),
+ })
+ }
+}
+
+impl Default for Print {
+ fn default() -> Self {
+ Self::None
+ }
+}
+
+pub(crate) fn extension_to_mime_type(ext: &str) -> Mime {
+ let basic_type = mime_guess::from_ext(ext).first_or_octet_stream();
+ for (simple, utf_8) in &TEXT_TYPES {
+ if &basic_type == simple {
+ return utf_8.clone();
+ }
+ }
+ basic_type
+}
+
+const TEXT_TYPES: [(Mime, Mime); 6] = [
+ (mime::TEXT_PLAIN, mime::TEXT_PLAIN_UTF_8),
+ (mime::TEXT_HTML, mime::TEXT_HTML_UTF_8),
+ (mime::TEXT_CSS, mime::TEXT_CSS_UTF_8),
+ (mime::TEXT_CSV, mime::TEXT_CSV_UTF_8),
+ (
+ mime::TEXT_TAB_SEPARATED_VALUES,
+ mime::TEXT_TAB_SEPARATED_VALUES_UTF_8,
+ ),
+ (
+ mime::APPLICATION_JAVASCRIPT,
+ mime::APPLICATION_JAVASCRIPT_UTF_8,
+ ),
+];
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_ext() {
+ assert_eq!(extension(Path::new("foo-bar.txt")), Some("txt"));
+ assert_eq!(extension(Path::new("foo-bar.html")), Some("html"));
+ assert_eq!(extension(Path::new("foo-bar.unknown")), Some("unknown"));
+
+ assert_eq!(extension(Path::new("foo/bar/baz.txt")), Some("txt"));
+ assert_eq!(extension(Path::new("foo/bar/baz.html")), Some("html"));
+ assert_eq!(extension(Path::new("foo/bar/baz.unknown")), Some("unknown"));
+ }
+
+ #[test]
+ fn test_double_ext() {
+ assert_eq!(extension(Path::new("foo-bar.html.txt")), Some("txt"));
+ assert_eq!(extension(Path::new("foo-bar.txt.html")), Some("html"));
+ assert_eq!(extension(Path::new("foo-bar.txt.unknown")), Some("unknown"));
+
+ assert_eq!(extension(Path::new("foo/bar/baz.html.txt")), Some("txt"));
+ assert_eq!(extension(Path::new("foo/bar/baz.txt.html")), Some("html"));
+ assert_eq!(
+ extension(Path::new("foo/bar/baz.txt.unknown")),
+ Some("unknown")
+ );
+ }
+
+ #[test]
+ fn test_skip_jinja_ext() {
+ assert_eq!(extension(Path::new("foo-bar.html.j2")), Some("html"));
+ assert_eq!(extension(Path::new("foo-bar.html.jinja")), Some("html"));
+ assert_eq!(extension(Path::new("foo-bar.html.jinja2")), Some("html"));
+
+ assert_eq!(extension(Path::new("foo/bar/baz.txt.j2")), Some("txt"));
+ assert_eq!(extension(Path::new("foo/bar/baz.txt.jinja")), Some("txt"));
+ assert_eq!(extension(Path::new("foo/bar/baz.txt.jinja2")), Some("txt"));
+ }
+
+ #[test]
+ fn test_only_jinja_ext() {
+ assert_eq!(extension(Path::new("foo-bar.j2")), Some("j2"));
+ assert_eq!(extension(Path::new("foo-bar.jinja")), Some("jinja"));
+ assert_eq!(extension(Path::new("foo-bar.jinja2")), Some("jinja2"));
+ }
+}
diff --git a/askama_derive/src/lib.rs b/askama_derive/src/lib.rs
index b41fa6a..2acf583 100644
--- a/askama_derive/src/lib.rs
+++ b/askama_derive/src/lib.rs
@@ -2,9 +2,99 @@
#![deny(elided_lifetimes_in_paths)]
#![deny(unreachable_pub)]
+use std::borrow::Cow;
+use std::fmt;
+
use proc_macro::TokenStream;
+use proc_macro2::Span;
+
+mod config;
+mod generator;
+mod heritage;
+mod input;
+mod parser;
#[proc_macro_derive(Template, attributes(template))]
pub fn derive_template(input: TokenStream) -> TokenStream {
- askama_shared::derive_template(input.into()).into()
+ generator::derive_template(input)
+}
+
+#[derive(Debug, Clone)]
+struct CompileError {
+ msg: Cow<'static, str>,
+ span: Span,
}
+
+impl CompileError {
+ fn new<S: Into<Cow<'static, str>>>(s: S, span: Span) -> Self {
+ Self {
+ msg: s.into(),
+ span,
+ }
+ }
+
+ fn into_compile_error(self) -> TokenStream {
+ syn::Error::new(self.span, self.msg)
+ .to_compile_error()
+ .into()
+ }
+}
+
+impl std::error::Error for CompileError {}
+
+impl fmt::Display for CompileError {
+ #[inline]
+ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+ fmt.write_str(&self.msg)
+ }
+}
+
+impl From<&'static str> for CompileError {
+ #[inline]
+ fn from(s: &'static str) -> Self {
+ Self::new(s, Span::call_site())
+ }
+}
+
+impl From<String> for CompileError {
+ #[inline]
+ fn from(s: String) -> Self {
+ Self::new(s, Span::call_site())
+ }
+}
+
+// This is used by the code generator to decide whether a named filter is part of
+// Askama or should refer to a local `filters` module. It should contain all the
+// filters shipped with Askama, even the optional ones (since optional inclusion
+// in the const vector based on features seems impossible right now).
+const BUILT_IN_FILTERS: &[&str] = &[
+ "abs",
+ "capitalize",
+ "center",
+ "e",
+ "escape",
+ "filesizeformat",
+ "fmt",
+ "format",
+ "indent",
+ "into_f64",
+ "into_isize",
+ "join",
+ "linebreaks",
+ "linebreaksbr",
+ "paragraphbreaks",
+ "lower",
+ "lowercase",
+ "safe",
+ "trim",
+ "truncate",
+ "upper",
+ "uppercase",
+ "urlencode",
+ "urlencode_strict",
+ "wordcount",
+ // optional features, reserve the names anyway:
+ "json",
+ "markdown",
+ "yaml",
+];
diff --git a/askama_derive/src/parser.rs b/askama_derive/src/parser.rs
new file mode 100644
index 0000000..efcad73
--- /dev/null
+++ b/askama_derive/src/parser.rs
@@ -0,0 +1,1885 @@
+use std::cell::Cell;
+use std::str;
+
+use nom::branch::alt;
+use nom::bytes::complete::{escaped, is_not, tag, take_till, take_until};
+use nom::character::complete::{anychar, char, digit1};
+use nom::combinator::{complete, consumed, cut, eof, map, not, opt, peek, recognize, value};
+use nom::error::{Error, ErrorKind};
+use nom::multi::{fold_many0, many0, many1, separated_list0, separated_list1};
+use nom::sequence::{delimited, pair, preceded, terminated, tuple};
+use nom::{self, error_position, AsChar, IResult, InputTakeAtPosition};
+
+use crate::config::Syntax;
+use crate::CompileError;
+
+#[derive(Debug, PartialEq)]
+pub(crate) enum Node<'a> {
+ Lit(&'a str, &'a str, &'a str),
+ Comment(Ws),
+ Expr(Ws, Expr<'a>),
+ Call(Ws, Option<&'a str>, &'a str, Vec<Expr<'a>>),
+ LetDecl(Ws, Target<'a>),
+ Let(Ws, Target<'a>, Expr<'a>),
+ Cond(Vec<Cond<'a>>, Ws),
+ Match(Ws, Expr<'a>, Vec<When<'a>>, Ws),
+ Loop(Loop<'a>),
+ Extends(Expr<'a>),
+ BlockDef(Ws, &'a str, Vec<Node<'a>>, Ws),
+ Include(Ws, &'a str),
+ Import(Ws, &'a str, &'a str),
+ Macro(&'a str, Macro<'a>),
+ Raw(Ws, &'a str, &'a str, &'a str, Ws),
+ Break(Ws),
+ Continue(Ws),
+}
+
+#[derive(Debug, PartialEq)]
+pub(crate) struct Loop<'a> {
+ pub(crate) ws1: Ws,
+ pub(crate) var: Target<'a>,
+ pub(crate) iter: Expr<'a>,
+ pub(crate) cond: Option<Expr<'a>>,
+ pub(crate) body: Vec<Node<'a>>,
+ pub(crate) ws2: Ws,
+ pub(crate) else_block: Vec<Node<'a>>,
+ pub(crate) ws3: Ws,
+}
+
+#[derive(Debug, PartialEq)]
+pub(crate) enum Expr<'a> {
+ BoolLit(&'a str),
+ NumLit(&'a str),
+ StrLit(&'a str),
+ CharLit(&'a str),
+ Var(&'a str),
+ Path(Vec<&'a str>),
+ Array(Vec<Expr<'a>>),
+ Attr(Box<Expr<'a>>, &'a str),
+ Index(Box<Expr<'a>>, Box<Expr<'a>>),
+ Filter(&'a str, Vec<Expr<'a>>),
+ Unary(&'a str, Box<Expr<'a>>),
+ BinOp(&'a str, Box<Expr<'a>>, Box<Expr<'a>>),
+ Range(&'a str, Option<Box<Expr<'a>>>, Option<Box<Expr<'a>>>),
+ Group(Box<Expr<'a>>),
+ Tuple(Vec<Expr<'a>>),
+ Call(Box<Expr<'a>>, Vec<Expr<'a>>),
+ RustMacro(&'a str, &'a str),
+ Try(Box<Expr<'a>>),
+}
+
+impl Expr<'_> {
+ /// Returns `true` if enough assumptions can be made,
+ /// to determine that `self` is copyable.
+ pub(crate) fn is_copyable(&self) -> bool {
+ self.is_copyable_within_op(false)
+ }
+
+ fn is_copyable_within_op(&self, within_op: bool) -> bool {
+ use Expr::*;
+ match self {
+ BoolLit(_) | NumLit(_) | StrLit(_) | CharLit(_) => true,
+ Unary(.., expr) => expr.is_copyable_within_op(true),
+ BinOp(_, lhs, rhs) => {
+ lhs.is_copyable_within_op(true) && rhs.is_copyable_within_op(true)
+ }
+ Range(..) => true,
+ // The result of a call likely doesn't need to be borrowed,
+ // as in that case the call is more likely to return a
+ // reference in the first place then.
+ Call(..) | Path(..) => true,
+ // If the `expr` is within a `Unary` or `BinOp` then
+ // an assumption can be made that the operand is copy.
+ // If not, then the value is moved and adding `.clone()`
+ // will solve that issue. However, if the operand is
+ // implicitly borrowed, then it's likely not even possible
+ // to get the template to compile.
+ _ => within_op && self.is_attr_self(),
+ }
+ }
+
+ /// Returns `true` if this is an `Attr` where the `obj` is `"self"`.
+ pub(crate) fn is_attr_self(&self) -> bool {
+ match self {
+ Expr::Attr(obj, _) if matches!(obj.as_ref(), Expr::Var("self")) => true,
+ Expr::Attr(obj, _) if matches!(obj.as_ref(), Expr::Attr(..)) => obj.is_attr_self(),
+ _ => false,
+ }
+ }
+}
+
+pub(crate) type When<'a> = (Ws, Target<'a>, Vec<Node<'a>>);
+
+#[derive(Debug, PartialEq)]
+pub(crate) struct Macro<'a> {
+ pub(crate) ws1: Ws,
+ pub(crate) args: Vec<&'a str>,
+ pub(crate) nodes: Vec<Node<'a>>,
+ pub(crate) ws2: Ws,
+}
+
+#[derive(Debug, PartialEq)]
+pub(crate) enum Target<'a> {
+ Name(&'a str),
+ Tuple(Vec<&'a str>, Vec<Target<'a>>),
+ Struct(Vec<&'a str>, Vec<(&'a str, Target<'a>)>),
+ NumLit(&'a str),
+ StrLit(&'a str),
+ CharLit(&'a str),
+ BoolLit(&'a str),
+ Path(Vec<&'a str>),
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub(crate) enum Whitespace {
+ Preserve,
+ Suppress,
+ Minimize,
+}
+
+impl From<char> for Whitespace {
+ fn from(c: char) -> Self {
+ match c {
+ '+' => Self::Preserve,
+ '-' => Self::Suppress,
+ '~' => Self::Minimize,
+ _ => panic!("unsupported `Whitespace` conversion"),
+ }
+ }
+}
+
+/// First field is "minus/plus sign was used on the left part of the item".
+///
+/// Second field is "minus/plus sign was used on the right part of the item".
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub(crate) struct Ws(pub(crate) Option<Whitespace>, pub(crate) Option<Whitespace>);
+
+pub(crate) type Cond<'a> = (Ws, Option<CondTest<'a>>, Vec<Node<'a>>);
+
+#[derive(Debug, PartialEq)]
+pub(crate) struct CondTest<'a> {
+ pub(crate) target: Option<Target<'a>>,
+ pub(crate) expr: Expr<'a>,
+}
+
+fn is_ws(c: char) -> bool {
+ matches!(c, ' ' | '\t' | '\r' | '\n')
+}
+
+fn not_ws(c: char) -> bool {
+ !is_ws(c)
+}
+
+fn ws<'a, O>(
+ inner: impl FnMut(&'a str) -> IResult<&'a str, O>,
+) -> impl FnMut(&'a str) -> IResult<&'a str, O> {
+ delimited(take_till(not_ws), inner, take_till(not_ws))
+}
+
+fn split_ws_parts(s: &str) -> Node<'_> {
+ let trimmed_start = s.trim_start_matches(is_ws);
+ let len_start = s.len() - trimmed_start.len();
+ let trimmed = trimmed_start.trim_end_matches(is_ws);
+ Node::Lit(&s[..len_start], trimmed, &trimmed_start[trimmed.len()..])
+}
+
+/// Skips input until `end` was found, but does not consume it.
+/// Returns tuple that would be returned when parsing `end`.
+fn skip_till<'a, O>(
+ end: impl FnMut(&'a str) -> IResult<&'a str, O>,
+) -> impl FnMut(&'a str) -> IResult<&'a str, (&'a str, O)> {
+ enum Next<O> {
+ IsEnd(O),
+ NotEnd(char),
+ }
+ let mut next = alt((map(end, Next::IsEnd), map(anychar, Next::NotEnd)));
+ move |start: &'a str| {
+ let mut i = start;
+ loop {
+ let (j, is_end) = next(i)?;
+ match is_end {
+ Next::IsEnd(lookahead) => return Ok((i, (j, lookahead))),
+ Next::NotEnd(_) => i = j,
+ }
+ }
+ }
+}
+
+struct State<'a> {
+ syntax: &'a Syntax<'a>,
+ loop_depth: Cell<usize>,
+}
+
+fn take_content<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let p_start = alt((
+ tag(s.syntax.block_start),
+ tag(s.syntax.comment_start),
+ tag(s.syntax.expr_start),
+ ));
+
+ let (i, _) = not(eof)(i)?;
+ let (i, content) = opt(recognize(skip_till(p_start)))(i)?;
+ let (i, content) = match content {
+ Some("") => {
+ // {block,comment,expr}_start follows immediately.
+ return Err(nom::Err::Error(error_position!(i, ErrorKind::TakeUntil)));
+ }
+ Some(content) => (i, content),
+ None => ("", i), // there is no {block,comment,expr}_start: take everything
+ };
+ Ok((i, split_ws_parts(content)))
+}
+
+fn identifier(input: &str) -> IResult<&str, &str> {
+ recognize(pair(identifier_start, opt(identifier_tail)))(input)
+}
+
+fn identifier_start(s: &str) -> IResult<&str, &str> {
+ s.split_at_position1_complete(
+ |c| !(c.is_alpha() || c == '_' || c >= '\u{0080}'),
+ nom::error::ErrorKind::Alpha,
+ )
+}
+
+fn identifier_tail(s: &str) -> IResult<&str, &str> {
+ s.split_at_position1_complete(
+ |c| !(c.is_alphanum() || c == '_' || c >= '\u{0080}'),
+ nom::error::ErrorKind::Alpha,
+ )
+}
+
+fn bool_lit(i: &str) -> IResult<&str, &str> {
+ alt((tag("false"), tag("true")))(i)
+}
+
+fn expr_bool_lit(i: &str) -> IResult<&str, Expr<'_>> {
+ map(bool_lit, Expr::BoolLit)(i)
+}
+
+fn variant_bool_lit(i: &str) -> IResult<&str, Target<'_>> {
+ map(bool_lit, Target::BoolLit)(i)
+}
+
+fn num_lit(i: &str) -> IResult<&str, &str> {
+ recognize(pair(digit1, opt(pair(char('.'), digit1))))(i)
+}
+
+fn expr_num_lit(i: &str) -> IResult<&str, Expr<'_>> {
+ map(num_lit, Expr::NumLit)(i)
+}
+
+fn expr_array_lit(i: &str) -> IResult<&str, Expr<'_>> {
+ delimited(
+ ws(char('[')),
+ map(separated_list1(ws(char(',')), expr_any), Expr::Array),
+ ws(char(']')),
+ )(i)
+}
+
+fn variant_num_lit(i: &str) -> IResult<&str, Target<'_>> {
+ map(num_lit, Target::NumLit)(i)
+}
+
+fn str_lit(i: &str) -> IResult<&str, &str> {
+ let (i, s) = delimited(
+ char('"'),
+ opt(escaped(is_not("\\\""), '\\', anychar)),
+ char('"'),
+ )(i)?;
+ Ok((i, s.unwrap_or_default()))
+}
+
+fn expr_str_lit(i: &str) -> IResult<&str, Expr<'_>> {
+ map(str_lit, Expr::StrLit)(i)
+}
+
+fn variant_str_lit(i: &str) -> IResult<&str, Target<'_>> {
+ map(str_lit, Target::StrLit)(i)
+}
+
+fn char_lit(i: &str) -> IResult<&str, &str> {
+ let (i, s) = delimited(
+ char('\''),
+ opt(escaped(is_not("\\\'"), '\\', anychar)),
+ char('\''),
+ )(i)?;
+ Ok((i, s.unwrap_or_default()))
+}
+
+fn expr_char_lit(i: &str) -> IResult<&str, Expr<'_>> {
+ map(char_lit, Expr::CharLit)(i)
+}
+
+fn variant_char_lit(i: &str) -> IResult<&str, Target<'_>> {
+ map(char_lit, Target::CharLit)(i)
+}
+
+fn expr_var(i: &str) -> IResult<&str, Expr<'_>> {
+ map(identifier, Expr::Var)(i)
+}
+
+fn path(i: &str) -> IResult<&str, Vec<&str>> {
+ let root = opt(value("", ws(tag("::"))));
+ let tail = separated_list1(ws(tag("::")), identifier);
+
+ match tuple((root, identifier, ws(tag("::")), tail))(i) {
+ Ok((i, (root, start, _, rest))) => {
+ let mut path = Vec::new();
+ path.extend(root);
+ path.push(start);
+ path.extend(rest);
+ Ok((i, path))
+ }
+ Err(err) => {
+ if let Ok((i, name)) = identifier(i) {
+ // The returned identifier can be assumed to be path if:
+ // - Contains both a lowercase and uppercase character, i.e. a type name like `None`
+ // - Doesn't contain any lowercase characters, i.e. it's a constant
+ // In short, if it contains any uppercase characters it's a path.
+ if name.contains(char::is_uppercase) {
+ return Ok((i, vec![name]));
+ }
+ }
+
+ // If `identifier()` fails then just return the original error
+ Err(err)
+ }
+ }
+}
+
+fn expr_path(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, path) = path(i)?;
+ Ok((i, Expr::Path(path)))
+}
+
+fn named_target(i: &str) -> IResult<&str, (&str, Target<'_>)> {
+ let (i, (src, target)) = pair(identifier, opt(preceded(ws(char(':')), target)))(i)?;
+ Ok((i, (src, target.unwrap_or(Target::Name(src)))))
+}
+
+fn variant_lit(i: &str) -> IResult<&str, Target<'_>> {
+ alt((
+ variant_str_lit,
+ variant_char_lit,
+ variant_num_lit,
+ variant_bool_lit,
+ ))(i)
+}
+
+fn target(i: &str) -> IResult<&str, Target<'_>> {
+ let mut opt_opening_paren = map(opt(ws(char('('))), |o| o.is_some());
+ let mut opt_closing_paren = map(opt(ws(char(')'))), |o| o.is_some());
+ let mut opt_opening_brace = map(opt(ws(char('{'))), |o| o.is_some());
+
+ let (i, lit) = opt(variant_lit)(i)?;
+ if let Some(lit) = lit {
+ return Ok((i, lit));
+ }
+
+ // match tuples and unused parentheses
+ let (i, target_is_tuple) = opt_opening_paren(i)?;
+ if target_is_tuple {
+ let (i, is_empty_tuple) = opt_closing_paren(i)?;
+ if is_empty_tuple {
+ return Ok((i, Target::Tuple(Vec::new(), Vec::new())));
+ }
+
+ let (i, first_target) = target(i)?;
+ let (i, is_unused_paren) = opt_closing_paren(i)?;
+ if is_unused_paren {
+ return Ok((i, first_target));
+ }
+
+ let mut targets = vec![first_target];
+ let (i, _) = cut(tuple((
+ fold_many0(
+ preceded(ws(char(',')), target),
+ || (),
+ |_, target| {
+ targets.push(target);
+ },
+ ),
+ opt(ws(char(','))),
+ ws(cut(char(')'))),
+ )))(i)?;
+ return Ok((i, Target::Tuple(Vec::new(), targets)));
+ }
+
+ // match structs
+ let (i, path) = opt(path)(i)?;
+ if let Some(path) = path {
+ let i_before_matching_with = i;
+ let (i, _) = opt(ws(tag("with")))(i)?;
+
+ let (i, is_unnamed_struct) = opt_opening_paren(i)?;
+ if is_unnamed_struct {
+ let (i, targets) = alt((
+ map(char(')'), |_| Vec::new()),
+ terminated(
+ cut(separated_list1(ws(char(',')), target)),
+ pair(opt(ws(char(','))), ws(cut(char(')')))),
+ ),
+ ))(i)?;
+ return Ok((i, Target::Tuple(path, targets)));
+ }
+
+ let (i, is_named_struct) = opt_opening_brace(i)?;
+ if is_named_struct {
+ let (i, targets) = alt((
+ map(char('}'), |_| Vec::new()),
+ terminated(
+ cut(separated_list1(ws(char(',')), named_target)),
+ pair(opt(ws(char(','))), ws(cut(char('}')))),
+ ),
+ ))(i)?;
+ return Ok((i, Target::Struct(path, targets)));
+ }
+
+ return Ok((i_before_matching_with, Target::Path(path)));
+ }
+
+ // neither literal nor struct nor path
+ map(identifier, Target::Name)(i)
+}
+
+fn arguments(i: &str) -> IResult<&str, Vec<Expr<'_>>> {
+ delimited(
+ ws(char('(')),
+ separated_list0(char(','), ws(expr_any)),
+ ws(char(')')),
+ )(i)
+}
+
+fn macro_arguments(i: &str) -> IResult<&str, &str> {
+ delimited(char('('), recognize(nested_parenthesis), char(')'))(i)
+}
+
+fn nested_parenthesis(i: &str) -> IResult<&str, ()> {
+ let mut nested = 0;
+ let mut last = 0;
+ let mut in_str = false;
+ let mut escaped = false;
+
+ for (i, b) in i.chars().enumerate() {
+ if !(b == '(' || b == ')') || !in_str {
+ match b {
+ '(' => nested += 1,
+ ')' => {
+ if nested == 0 {
+ last = i;
+ break;
+ }
+ nested -= 1;
+ }
+ '"' => {
+ if in_str {
+ if !escaped {
+ in_str = false;
+ }
+ } else {
+ in_str = true;
+ }
+ }
+ '\\' => {
+ escaped = !escaped;
+ }
+ _ => (),
+ }
+ }
+
+ if escaped && b != '\\' {
+ escaped = false;
+ }
+ }
+
+ if nested == 0 {
+ Ok((&i[last..], ()))
+ } else {
+ Err(nom::Err::Error(error_position!(
+ i,
+ ErrorKind::SeparatedNonEmptyList
+ )))
+ }
+}
+
+fn parameters(i: &str) -> IResult<&str, Vec<&str>> {
+ delimited(
+ ws(char('(')),
+ separated_list0(char(','), ws(identifier)),
+ ws(char(')')),
+ )(i)
+}
+
+fn expr_group(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, expr) = preceded(ws(char('(')), opt(expr_any))(i)?;
+ let expr = match expr {
+ Some(expr) => expr,
+ None => {
+ let (i, _) = char(')')(i)?;
+ return Ok((i, Expr::Tuple(vec![])));
+ }
+ };
+
+ let (i, comma) = ws(opt(peek(char(','))))(i)?;
+ if comma.is_none() {
+ let (i, _) = char(')')(i)?;
+ return Ok((i, Expr::Group(Box::new(expr))));
+ }
+
+ let mut exprs = vec![expr];
+ let (i, _) = fold_many0(
+ preceded(char(','), ws(expr_any)),
+ || (),
+ |_, expr| {
+ exprs.push(expr);
+ },
+ )(i)?;
+ let (i, _) = pair(ws(opt(char(','))), char(')'))(i)?;
+ Ok((i, Expr::Tuple(exprs)))
+}
+
+fn expr_single(i: &str) -> IResult<&str, Expr<'_>> {
+ alt((
+ expr_bool_lit,
+ expr_num_lit,
+ expr_str_lit,
+ expr_char_lit,
+ expr_path,
+ expr_rust_macro,
+ expr_array_lit,
+ expr_var,
+ expr_group,
+ ))(i)
+}
+
+enum Suffix<'a> {
+ Attr(&'a str),
+ Index(Expr<'a>),
+ Call(Vec<Expr<'a>>),
+ Try,
+}
+
+fn expr_attr(i: &str) -> IResult<&str, Suffix<'_>> {
+ map(
+ preceded(
+ ws(pair(char('.'), not(char('.')))),
+ cut(alt((num_lit, identifier))),
+ ),
+ Suffix::Attr,
+ )(i)
+}
+
+fn expr_index(i: &str) -> IResult<&str, Suffix<'_>> {
+ map(
+ preceded(ws(char('[')), cut(terminated(expr_any, ws(char(']'))))),
+ Suffix::Index,
+ )(i)
+}
+
+fn expr_call(i: &str) -> IResult<&str, Suffix<'_>> {
+ map(arguments, Suffix::Call)(i)
+}
+
+fn expr_try(i: &str) -> IResult<&str, Suffix<'_>> {
+ map(preceded(take_till(not_ws), char('?')), |_| Suffix::Try)(i)
+}
+
+fn filter(i: &str) -> IResult<&str, (&str, Option<Vec<Expr<'_>>>)> {
+ let (i, (_, fname, args)) = tuple((char('|'), ws(identifier), opt(arguments)))(i)?;
+ Ok((i, (fname, args)))
+}
+
+fn expr_filtered(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, (obj, filters)) = tuple((expr_prefix, many0(filter)))(i)?;
+
+ let mut res = obj;
+ for (fname, args) in filters {
+ res = Expr::Filter(fname, {
+ let mut args = match args {
+ Some(inner) => inner,
+ None => Vec::new(),
+ };
+ args.insert(0, res);
+ args
+ });
+ }
+
+ Ok((i, res))
+}
+
+fn expr_prefix(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, (ops, mut expr)) = pair(many0(ws(alt((tag("!"), tag("-"))))), expr_suffix)(i)?;
+ for op in ops.iter().rev() {
+ expr = Expr::Unary(op, Box::new(expr));
+ }
+ Ok((i, expr))
+}
+
+fn expr_suffix(i: &str) -> IResult<&str, Expr<'_>> {
+ let (mut i, mut expr) = expr_single(i)?;
+ loop {
+ let (j, suffix) = opt(alt((expr_attr, expr_index, expr_call, expr_try)))(i)?;
+ i = j;
+ match suffix {
+ Some(Suffix::Attr(attr)) => expr = Expr::Attr(expr.into(), attr),
+ Some(Suffix::Index(index)) => expr = Expr::Index(expr.into(), index.into()),
+ Some(Suffix::Call(args)) => expr = Expr::Call(expr.into(), args),
+ Some(Suffix::Try) => expr = Expr::Try(expr.into()),
+ None => break,
+ }
+ }
+ Ok((i, expr))
+}
+
+fn expr_rust_macro(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, (mname, _, args)) = tuple((identifier, char('!'), macro_arguments))(i)?;
+ Ok((i, Expr::RustMacro(mname, args)))
+}
+
+macro_rules! expr_prec_layer {
+ ( $name:ident, $inner:ident, $op:expr ) => {
+ fn $name(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, left) = $inner(i)?;
+ let (i, right) = many0(pair(
+ ws(tag($op)),
+ $inner,
+ ))(i)?;
+ Ok((
+ i,
+ right.into_iter().fold(left, |left, (op, right)| {
+ Expr::BinOp(op, Box::new(left), Box::new(right))
+ }),
+ ))
+ }
+ };
+ ( $name:ident, $inner:ident, $( $op:expr ),+ ) => {
+ fn $name(i: &str) -> IResult<&str, Expr<'_>> {
+ let (i, left) = $inner(i)?;
+ let (i, right) = many0(pair(
+ ws(alt(($( tag($op) ),+,))),
+ $inner,
+ ))(i)?;
+ Ok((
+ i,
+ right.into_iter().fold(left, |left, (op, right)| {
+ Expr::BinOp(op, Box::new(left), Box::new(right))
+ }),
+ ))
+ }
+ }
+}
+
+expr_prec_layer!(expr_muldivmod, expr_filtered, "*", "/", "%");
+expr_prec_layer!(expr_addsub, expr_muldivmod, "+", "-");
+expr_prec_layer!(expr_shifts, expr_addsub, ">>", "<<");
+expr_prec_layer!(expr_band, expr_shifts, "&");
+expr_prec_layer!(expr_bxor, expr_band, "^");
+expr_prec_layer!(expr_bor, expr_bxor, "|");
+expr_prec_layer!(expr_compare, expr_bor, "==", "!=", ">=", ">", "<=", "<");
+expr_prec_layer!(expr_and, expr_compare, "&&");
+expr_prec_layer!(expr_or, expr_and, "||");
+
+fn expr_handle_ws(i: &str) -> IResult<&str, Whitespace> {
+ alt((char('-'), char('+'), char('~')))(i).map(|(s, r)| (s, Whitespace::from(r)))
+}
+
+fn expr_any(i: &str) -> IResult<&str, Expr<'_>> {
+ let range_right = |i| pair(ws(alt((tag("..="), tag("..")))), opt(expr_or))(i);
+ alt((
+ map(range_right, |(op, right)| {
+ Expr::Range(op, None, right.map(Box::new))
+ }),
+ map(
+ pair(expr_or, opt(range_right)),
+ |(left, right)| match right {
+ Some((op, right)) => Expr::Range(op, Some(Box::new(left)), right.map(Box::new)),
+ None => left,
+ },
+ ),
+ ))(i)
+}
+
+fn expr_node<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ |i| tag_expr_start(i, s),
+ cut(tuple((
+ opt(expr_handle_ws),
+ ws(expr_any),
+ opt(expr_handle_ws),
+ |i| tag_expr_end(i, s),
+ ))),
+ ));
+ let (i, (_, (pws, expr, nws, _))) = p(i)?;
+ Ok((i, Node::Expr(Ws(pws, nws), expr)))
+}
+
+fn block_call(i: &str) -> IResult<&str, Node<'_>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("call")),
+ cut(tuple((
+ opt(tuple((ws(identifier), ws(tag("::"))))),
+ ws(identifier),
+ ws(arguments),
+ opt(expr_handle_ws),
+ ))),
+ ));
+ let (i, (pws, _, (scope, name, args, nws))) = p(i)?;
+ let scope = scope.map(|(scope, _)| scope);
+ Ok((i, Node::Call(Ws(pws, nws), scope, name, args)))
+}
+
+fn cond_if(i: &str) -> IResult<&str, CondTest<'_>> {
+ let mut p = preceded(
+ ws(tag("if")),
+ cut(tuple((
+ opt(delimited(
+ ws(alt((tag("let"), tag("set")))),
+ ws(target),
+ ws(char('=')),
+ )),
+ ws(expr_any),
+ ))),
+ );
+ let (i, (target, expr)) = p(i)?;
+ Ok((i, CondTest { target, expr }))
+}
+
+fn cond_block<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Cond<'a>> {
+ let mut p = tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("else")),
+ cut(tuple((
+ opt(cond_if),
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(|i| parse_template(i, s)),
+ ))),
+ ));
+ let (i, (_, pws, _, (cond, nws, _, block))) = p(i)?;
+ Ok((i, (Ws(pws, nws), cond, block)))
+}
+
+fn block_if<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ cond_if,
+ cut(tuple((
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(tuple((
+ |i| parse_template(i, s),
+ many0(|i| cond_block(i, s)),
+ cut(tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("endif")),
+ opt(expr_handle_ws),
+ ))),
+ ))),
+ ))),
+ ));
+ let (i, (pws1, cond, (nws1, _, (block, elifs, (_, pws2, _, nws2))))) = p(i)?;
+
+ let mut res = vec![(Ws(pws1, nws1), Some(cond), block)];
+ res.extend(elifs);
+ Ok((i, Node::Cond(res, Ws(pws2, nws2))))
+}
+
+fn match_else_block<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, When<'a>> {
+ let mut p = tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("else")),
+ cut(tuple((
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(|i| parse_template(i, s)),
+ ))),
+ ));
+ let (i, (_, pws, _, (nws, _, block))) = p(i)?;
+ Ok((i, (Ws(pws, nws), Target::Name("_"), block)))
+}
+
+fn when_block<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, When<'a>> {
+ let mut p = tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("when")),
+ cut(tuple((
+ ws(target),
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(|i| parse_template(i, s)),
+ ))),
+ ));
+ let (i, (_, pws, _, (target, nws, _, block))) = p(i)?;
+ Ok((i, (Ws(pws, nws), target, block)))
+}
+
+fn block_match<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("match")),
+ cut(tuple((
+ ws(expr_any),
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(tuple((
+ ws(many0(ws(value((), |i| block_comment(i, s))))),
+ many1(|i| when_block(i, s)),
+ cut(tuple((
+ opt(|i| match_else_block(i, s)),
+ cut(tuple((
+ ws(|i| tag_block_start(i, s)),
+ opt(expr_handle_ws),
+ ws(tag("endmatch")),
+ opt(expr_handle_ws),
+ ))),
+ ))),
+ ))),
+ ))),
+ ));
+ let (i, (pws1, _, (expr, nws1, _, (_, arms, (else_arm, (_, pws2, _, nws2)))))) = p(i)?;
+
+ let mut arms = arms;
+ if let Some(arm) = else_arm {
+ arms.push(arm);
+ }
+
+ Ok((i, Node::Match(Ws(pws1, nws1), expr, arms, Ws(pws2, nws2))))
+}
+
+fn block_let(i: &str) -> IResult<&str, Node<'_>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(alt((tag("let"), tag("set")))),
+ cut(tuple((
+ ws(target),
+ opt(tuple((ws(char('=')), ws(expr_any)))),
+ opt(expr_handle_ws),
+ ))),
+ ));
+ let (i, (pws, _, (var, val, nws))) = p(i)?;
+
+ Ok((
+ i,
+ if let Some((_, val)) = val {
+ Node::Let(Ws(pws, nws), var, val)
+ } else {
+ Node::LetDecl(Ws(pws, nws), var)
+ },
+ ))
+}
+
+fn parse_loop_content<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Vec<Node<'a>>> {
+ s.loop_depth.set(s.loop_depth.get() + 1);
+ let result = parse_template(i, s);
+ s.loop_depth.set(s.loop_depth.get() - 1);
+ result
+}
+
+fn block_for<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let if_cond = preceded(ws(tag("if")), cut(ws(expr_any)));
+ let else_block = |i| {
+ let mut p = preceded(
+ ws(tag("else")),
+ cut(tuple((
+ opt(expr_handle_ws),
+ delimited(
+ |i| tag_block_end(i, s),
+ |i| parse_template(i, s),
+ |i| tag_block_start(i, s),
+ ),
+ opt(expr_handle_ws),
+ ))),
+ );
+ let (i, (pws, nodes, nws)) = p(i)?;
+ Ok((i, (pws, nodes, nws)))
+ };
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("for")),
+ cut(tuple((
+ ws(target),
+ ws(tag("in")),
+ cut(tuple((
+ ws(expr_any),
+ opt(if_cond),
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ cut(tuple((
+ |i| parse_loop_content(i, s),
+ cut(tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ opt(else_block),
+ ws(tag("endfor")),
+ opt(expr_handle_ws),
+ ))),
+ ))),
+ ))),
+ ))),
+ ));
+ let (i, (pws1, _, (var, _, (iter, cond, nws1, _, (body, (_, pws2, else_block, _, nws2)))))) =
+ p(i)?;
+ let (nws3, else_block, pws3) = else_block.unwrap_or_default();
+ Ok((
+ i,
+ Node::Loop(Loop {
+ ws1: Ws(pws1, nws1),
+ var,
+ iter,
+ cond,
+ body,
+ ws2: Ws(pws2, nws3),
+ else_block,
+ ws3: Ws(pws3, nws2),
+ }),
+ ))
+}
+
+fn block_extends(i: &str) -> IResult<&str, Node<'_>> {
+ let (i, (_, name)) = tuple((ws(tag("extends")), ws(expr_str_lit)))(i)?;
+ Ok((i, Node::Extends(name)))
+}
+
+fn block_block<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut start = tuple((
+ opt(expr_handle_ws),
+ ws(tag("block")),
+ cut(tuple((ws(identifier), opt(expr_handle_ws), |i| {
+ tag_block_end(i, s)
+ }))),
+ ));
+ let (i, (pws1, _, (name, nws1, _))) = start(i)?;
+
+ let mut end = cut(tuple((
+ |i| parse_template(i, s),
+ cut(tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("endblock")),
+ cut(tuple((opt(ws(tag(name))), opt(expr_handle_ws)))),
+ ))),
+ )));
+ let (i, (contents, (_, pws2, _, (_, nws2)))) = end(i)?;
+
+ Ok((
+ i,
+ Node::BlockDef(Ws(pws1, nws1), name, contents, Ws(pws2, nws2)),
+ ))
+}
+
+fn block_include(i: &str) -> IResult<&str, Node<'_>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("include")),
+ cut(pair(ws(str_lit), opt(expr_handle_ws))),
+ ));
+ let (i, (pws, _, (name, nws))) = p(i)?;
+ Ok((i, Node::Include(Ws(pws, nws), name)))
+}
+
+fn block_import(i: &str) -> IResult<&str, Node<'_>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("import")),
+ cut(tuple((
+ ws(str_lit),
+ ws(tag("as")),
+ cut(pair(ws(identifier), opt(expr_handle_ws))),
+ ))),
+ ));
+ let (i, (pws, _, (name, _, (scope, nws)))) = p(i)?;
+ Ok((i, Node::Import(Ws(pws, nws), name, scope)))
+}
+
+fn block_macro<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut start = tuple((
+ opt(expr_handle_ws),
+ ws(tag("macro")),
+ cut(tuple((
+ ws(identifier),
+ ws(parameters),
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ ))),
+ ));
+ let (i, (pws1, _, (name, params, nws1, _))) = start(i)?;
+
+ let mut end = cut(tuple((
+ |i| parse_template(i, s),
+ cut(tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("endmacro")),
+ cut(tuple((opt(ws(tag(name))), opt(expr_handle_ws)))),
+ ))),
+ )));
+ let (i, (contents, (_, pws2, _, (_, nws2)))) = end(i)?;
+
+ assert_ne!(name, "super", "invalid macro name 'super'");
+
+ Ok((
+ i,
+ Node::Macro(
+ name,
+ Macro {
+ ws1: Ws(pws1, nws1),
+ args: params,
+ nodes: contents,
+ ws2: Ws(pws2, nws2),
+ },
+ ),
+ ))
+}
+
+fn block_raw<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let endraw = tuple((
+ |i| tag_block_start(i, s),
+ opt(expr_handle_ws),
+ ws(tag("endraw")),
+ opt(expr_handle_ws),
+ peek(|i| tag_block_end(i, s)),
+ ));
+
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("raw")),
+ cut(tuple((
+ opt(expr_handle_ws),
+ |i| tag_block_end(i, s),
+ consumed(skip_till(endraw)),
+ ))),
+ ));
+
+ let (_, (pws1, _, (nws1, _, (contents, (i, (_, pws2, _, nws2, _)))))) = p(i)?;
+ let (lws, val, rws) = match split_ws_parts(contents) {
+ Node::Lit(lws, val, rws) => (lws, val, rws),
+ _ => unreachable!(),
+ };
+ let ws1 = Ws(pws1, nws1);
+ let ws2 = Ws(pws2, nws2);
+ Ok((i, Node::Raw(ws1, lws, val, rws, ws2)))
+}
+
+fn break_statement<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((opt(expr_handle_ws), ws(tag("break")), opt(expr_handle_ws)));
+ let (j, (pws, _, nws)) = p(i)?;
+ if s.loop_depth.get() == 0 {
+ return Err(nom::Err::Failure(error_position!(i, ErrorKind::Tag)));
+ }
+ Ok((j, Node::Break(Ws(pws, nws))))
+}
+
+fn continue_statement<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ opt(expr_handle_ws),
+ ws(tag("continue")),
+ opt(expr_handle_ws),
+ ));
+ let (j, (pws, _, nws)) = p(i)?;
+ if s.loop_depth.get() == 0 {
+ return Err(nom::Err::Failure(error_position!(i, ErrorKind::Tag)));
+ }
+ Ok((j, Node::Continue(Ws(pws, nws))))
+}
+
+fn block_node<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ |i| tag_block_start(i, s),
+ alt((
+ block_call,
+ block_let,
+ |i| block_if(i, s),
+ |i| block_for(i, s),
+ |i| block_match(i, s),
+ block_extends,
+ block_include,
+ block_import,
+ |i| block_block(i, s),
+ |i| block_macro(i, s),
+ |i| block_raw(i, s),
+ |i| break_statement(i, s),
+ |i| continue_statement(i, s),
+ )),
+ cut(|i| tag_block_end(i, s)),
+ ));
+ let (i, (_, contents, _)) = p(i)?;
+ Ok((i, contents))
+}
+
+fn block_comment_body<'a>(mut i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ let mut level = 0;
+ loop {
+ let (end, tail) = take_until(s.syntax.comment_end)(i)?;
+ match take_until::<_, _, Error<_>>(s.syntax.comment_start)(i) {
+ Ok((start, _)) if start.as_ptr() < end.as_ptr() => {
+ level += 1;
+ i = &start[2..];
+ }
+ _ if level > 0 => {
+ level -= 1;
+ i = &end[2..];
+ }
+ _ => return Ok((end, tail)),
+ }
+ }
+}
+
+fn block_comment<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Node<'a>> {
+ let mut p = tuple((
+ |i| tag_comment_start(i, s),
+ cut(tuple((
+ opt(expr_handle_ws),
+ |i| block_comment_body(i, s),
+ |i| tag_comment_end(i, s),
+ ))),
+ ));
+ let (i, (_, (pws, tail, _))) = p(i)?;
+ let nws = if tail.ends_with('-') {
+ Some(Whitespace::Suppress)
+ } else if tail.ends_with('+') {
+ Some(Whitespace::Preserve)
+ } else if tail.ends_with('~') {
+ Some(Whitespace::Minimize)
+ } else {
+ None
+ };
+ Ok((i, Node::Comment(Ws(pws, nws))))
+}
+
+fn parse_template<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, Vec<Node<'a>>> {
+ many0(alt((
+ complete(|i| take_content(i, s)),
+ complete(|i| block_comment(i, s)),
+ complete(|i| expr_node(i, s)),
+ complete(|i| block_node(i, s)),
+ )))(i)
+}
+
+fn tag_block_start<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.block_start)(i)
+}
+fn tag_block_end<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.block_end)(i)
+}
+fn tag_comment_start<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.comment_start)(i)
+}
+fn tag_comment_end<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.comment_end)(i)
+}
+fn tag_expr_start<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.expr_start)(i)
+}
+fn tag_expr_end<'a>(i: &'a str, s: &State<'_>) -> IResult<&'a str, &'a str> {
+ tag(s.syntax.expr_end)(i)
+}
+
+pub(crate) fn parse<'a>(
+ src: &'a str,
+ syntax: &'a Syntax<'a>,
+) -> Result<Vec<Node<'a>>, CompileError> {
+ let state = State {
+ syntax,
+ loop_depth: Cell::new(0),
+ };
+ match parse_template(src, &state) {
+ Ok((left, res)) => {
+ if !left.is_empty() {
+ Err(format!("unable to parse template:\n\n{:?}", left).into())
+ } else {
+ Ok(res)
+ }
+ }
+
+ Err(nom::Err::Error(err)) | Err(nom::Err::Failure(err)) => {
+ let nom::error::Error { input, .. } = err;
+ let offset = src.len() - input.len();
+ let (source_before, source_after) = src.split_at(offset);
+
+ let source_after = match source_after.char_indices().enumerate().take(41).last() {
+ Some((40, (i, _))) => format!("{:?}...", &source_after[..i]),
+ _ => format!("{:?}", source_after),
+ };
+
+ let (row, last_line) = source_before.lines().enumerate().last().unwrap();
+ let column = last_line.chars().count();
+
+ let msg = format!(
+ "problems parsing template source at row {}, column {} near:\n{}",
+ row + 1,
+ column,
+ source_after,
+ );
+ Err(msg.into())
+ }
+
+ Err(nom::Err::Incomplete(_)) => Err("parsing incomplete".into()),
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::{Expr, Node, Whitespace, Ws};
+ use crate::config::Syntax;
+
+ fn check_ws_split(s: &str, res: &(&str, &str, &str)) {
+ match super::split_ws_parts(s) {
+ Node::Lit(lws, s, rws) => {
+ assert_eq!(lws, res.0);
+ assert_eq!(s, res.1);
+ assert_eq!(rws, res.2);
+ }
+ _ => {
+ panic!("fail");
+ }
+ }
+ }
+
+ #[test]
+ fn test_ws_splitter() {
+ check_ws_split("", &("", "", ""));
+ check_ws_split("a", &("", "a", ""));
+ check_ws_split("\ta", &("\t", "a", ""));
+ check_ws_split("b\n", &("", "b", "\n"));
+ check_ws_split(" \t\r\n", &(" \t\r\n", "", ""));
+ }
+
+ #[test]
+ #[should_panic]
+ fn test_invalid_block() {
+ super::parse("{% extend \"blah\" %}", &Syntax::default()).unwrap();
+ }
+
+ #[test]
+ fn test_parse_filter() {
+ use Expr::*;
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ strvar|e }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Filter("e", vec![Var("strvar")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ 2|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Filter("abs", vec![NumLit("2")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ -2|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter("abs", vec![Unary("-", NumLit("2").into())]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1 - 2)|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter(
+ "abs",
+ vec![Group(
+ BinOp("-", NumLit("1").into(), NumLit("2").into()).into()
+ )]
+ ),
+ )],
+ );
+ }
+
+ #[test]
+ fn test_parse_numbers() {
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ 2 }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::NumLit("2"),)],
+ );
+ assert_eq!(
+ super::parse("{{ 2.5 }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::NumLit("2.5"),)],
+ );
+ }
+
+ #[test]
+ fn test_parse_var() {
+ let s = Syntax::default();
+
+ assert_eq!(
+ super::parse("{{ foo }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Var("foo"))],
+ );
+ assert_eq!(
+ super::parse("{{ foo_bar }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Var("foo_bar"))],
+ );
+
+ assert_eq!(
+ super::parse("{{ none }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Var("none"))],
+ );
+ }
+
+ #[test]
+ fn test_parse_const() {
+ let s = Syntax::default();
+
+ assert_eq!(
+ super::parse("{{ FOO }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Path(vec!["FOO"]))],
+ );
+ assert_eq!(
+ super::parse("{{ FOO_BAR }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Path(vec!["FOO_BAR"]))],
+ );
+
+ assert_eq!(
+ super::parse("{{ NONE }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Path(vec!["NONE"]))],
+ );
+ }
+
+ #[test]
+ fn test_parse_path() {
+ let s = Syntax::default();
+
+ assert_eq!(
+ super::parse("{{ None }}", &s).unwrap(),
+ vec![Node::Expr(Ws(None, None), Expr::Path(vec!["None"]))],
+ );
+ assert_eq!(
+ super::parse("{{ Some(123) }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Path(vec!["Some"])),
+ vec![Expr::NumLit("123")]
+ ),
+ )],
+ );
+
+ assert_eq!(
+ super::parse("{{ Ok(123) }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(Box::new(Expr::Path(vec!["Ok"])), vec![Expr::NumLit("123")]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ Err(123) }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(Box::new(Expr::Path(vec!["Err"])), vec![Expr::NumLit("123")]),
+ )],
+ );
+ }
+
+ #[test]
+ fn test_parse_var_call() {
+ assert_eq!(
+ super::parse("{{ function(\"123\", 3) }}", &Syntax::default()).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Var("function")),
+ vec![Expr::StrLit("123"), Expr::NumLit("3")]
+ ),
+ )],
+ );
+ }
+
+ #[test]
+ fn test_parse_path_call() {
+ let s = Syntax::default();
+
+ assert_eq!(
+ super::parse("{{ Option::None }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Path(vec!["Option", "None"])
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ Option::Some(123) }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Path(vec!["Option", "Some"])),
+ vec![Expr::NumLit("123")],
+ ),
+ )],
+ );
+
+ assert_eq!(
+ super::parse("{{ self::function(\"123\", 3) }}", &s).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Path(vec!["self", "function"])),
+ vec![Expr::StrLit("123"), Expr::NumLit("3")],
+ ),
+ )],
+ );
+ }
+
+ #[test]
+ fn test_parse_root_path() {
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ std::string::String::new() }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Path(vec!["std", "string", "String", "new"])),
+ vec![]
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ ::std::string::String::new() }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Expr::Call(
+ Box::new(Expr::Path(vec!["", "std", "string", "String", "new"])),
+ vec![]
+ ),
+ )],
+ );
+ }
+
+ #[test]
+ fn change_delimiters_parse_filter() {
+ let syntax = Syntax {
+ expr_start: "{=",
+ expr_end: "=}",
+ ..Syntax::default()
+ };
+
+ super::parse("{= strvar|e =}", &syntax).unwrap();
+ }
+
+ #[test]
+ fn test_precedence() {
+ use Expr::*;
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ a + b == c }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "==",
+ BinOp("+", Var("a").into(), Var("b").into()).into(),
+ Var("c").into(),
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a + b * c - d / e }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "-",
+ BinOp(
+ "+",
+ Var("a").into(),
+ BinOp("*", Var("b").into(), Var("c").into()).into(),
+ )
+ .into(),
+ BinOp("/", Var("d").into(), Var("e").into()).into(),
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a * (b + c) / -d }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "/",
+ BinOp(
+ "*",
+ Var("a").into(),
+ Group(BinOp("+", Var("b").into(), Var("c").into()).into()).into()
+ )
+ .into(),
+ Unary("-", Var("d").into()).into()
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a || b && c || d && e }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "||",
+ BinOp(
+ "||",
+ Var("a").into(),
+ BinOp("&&", Var("b").into(), Var("c").into()).into(),
+ )
+ .into(),
+ BinOp("&&", Var("d").into(), Var("e").into()).into(),
+ )
+ )],
+ );
+ }
+
+ #[test]
+ fn test_associativity() {
+ use Expr::*;
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ a + b + c }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "+",
+ BinOp("+", Var("a").into(), Var("b").into()).into(),
+ Var("c").into()
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a * b * c }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "*",
+ BinOp("*", Var("a").into(), Var("b").into()).into(),
+ Var("c").into()
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a && b && c }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "&&",
+ BinOp("&&", Var("a").into(), Var("b").into()).into(),
+ Var("c").into()
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a + b - c + d }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "+",
+ BinOp(
+ "-",
+ BinOp("+", Var("a").into(), Var("b").into()).into(),
+ Var("c").into()
+ )
+ .into(),
+ Var("d").into()
+ )
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a == b != c > d > e == f }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "==",
+ BinOp(
+ ">",
+ BinOp(
+ ">",
+ BinOp(
+ "!=",
+ BinOp("==", Var("a").into(), Var("b").into()).into(),
+ Var("c").into()
+ )
+ .into(),
+ Var("d").into()
+ )
+ .into(),
+ Var("e").into()
+ )
+ .into(),
+ Var("f").into()
+ )
+ )],
+ );
+ }
+
+ #[test]
+ fn test_odd_calls() {
+ use Expr::*;
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ a[b](c) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Call(
+ Box::new(Index(Box::new(Var("a")), Box::new(Var("b")))),
+ vec![Var("c")],
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (a + b)(c) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Call(
+ Box::new(Group(Box::new(BinOp(
+ "+",
+ Box::new(Var("a")),
+ Box::new(Var("b"))
+ )))),
+ vec![Var("c")],
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ a + b(c) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "+",
+ Box::new(Var("a")),
+ Box::new(Call(Box::new(Var("b")), vec![Var("c")])),
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (-a)(b) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Call(
+ Box::new(Group(Box::new(Unary("-", Box::new(Var("a")))))),
+ vec![Var("b")],
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ -a(b) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Unary("-", Box::new(Call(Box::new(Var("a")), vec![Var("b")])),),
+ )],
+ );
+ }
+
+ #[test]
+ fn test_parse_comments() {
+ let s = &Syntax::default();
+
+ assert_eq!(
+ super::parse("{##}", s).unwrap(),
+ vec![Node::Comment(Ws(None, None))],
+ );
+ assert_eq!(
+ super::parse("{#- #}", s).unwrap(),
+ vec![Node::Comment(Ws(Some(Whitespace::Suppress), None))],
+ );
+ assert_eq!(
+ super::parse("{# -#}", s).unwrap(),
+ vec![Node::Comment(Ws(None, Some(Whitespace::Suppress)))],
+ );
+ assert_eq!(
+ super::parse("{#--#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Suppress),
+ Some(Whitespace::Suppress)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#- foo\n bar -#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Suppress),
+ Some(Whitespace::Suppress)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#- foo\n {#- bar\n -#} baz -#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Suppress),
+ Some(Whitespace::Suppress)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#+ #}", s).unwrap(),
+ vec![Node::Comment(Ws(Some(Whitespace::Preserve), None))],
+ );
+ assert_eq!(
+ super::parse("{# +#}", s).unwrap(),
+ vec![Node::Comment(Ws(None, Some(Whitespace::Preserve)))],
+ );
+ assert_eq!(
+ super::parse("{#++#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Preserve),
+ Some(Whitespace::Preserve)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#+ foo\n bar +#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Preserve),
+ Some(Whitespace::Preserve)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#+ foo\n {#+ bar\n +#} baz -+#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Preserve),
+ Some(Whitespace::Preserve)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#~ #}", s).unwrap(),
+ vec![Node::Comment(Ws(Some(Whitespace::Minimize), None))],
+ );
+ assert_eq!(
+ super::parse("{# ~#}", s).unwrap(),
+ vec![Node::Comment(Ws(None, Some(Whitespace::Minimize)))],
+ );
+ assert_eq!(
+ super::parse("{#~~#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Minimize),
+ Some(Whitespace::Minimize)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#~ foo\n bar ~#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Minimize),
+ Some(Whitespace::Minimize)
+ ))],
+ );
+ assert_eq!(
+ super::parse("{#~ foo\n {#~ bar\n ~#} baz -~#}", s).unwrap(),
+ vec![Node::Comment(Ws(
+ Some(Whitespace::Minimize),
+ Some(Whitespace::Minimize)
+ ))],
+ );
+
+ assert_eq!(
+ super::parse("{# foo {# bar #} {# {# baz #} qux #} #}", s).unwrap(),
+ vec![Node::Comment(Ws(None, None))],
+ );
+ }
+
+ #[test]
+ fn test_parse_tuple() {
+ use super::Expr::*;
+ let syntax = Syntax::default();
+ assert_eq!(
+ super::parse("{{ () }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Tuple(vec![]),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1) }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Group(Box::new(NumLit("1"))),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1,) }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Tuple(vec![NumLit("1")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1, ) }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Tuple(vec![NumLit("1")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1 ,) }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Tuple(vec![NumLit("1")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1 , ) }}", &syntax).unwrap(),
+ vec![Node::Expr(Ws(None, None), Tuple(vec![NumLit("1")]),)],
+ );
+ assert_eq!(
+ super::parse("{{ (1, 2) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Tuple(vec![NumLit("1"), NumLit("2")]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1, 2,) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Tuple(vec![NumLit("1"), NumLit("2")]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1, 2, 3) }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Tuple(vec![NumLit("1"), NumLit("2"), NumLit("3")]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ ()|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter("abs", vec![Tuple(vec![])]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ () | abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp("|", Box::new(Tuple(vec![])), Box::new(Var("abs"))),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1)|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter("abs", vec![Group(Box::new(NumLit("1")))]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1) | abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "|",
+ Box::new(Group(Box::new(NumLit("1")))),
+ Box::new(Var("abs"))
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1,)|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter("abs", vec![Tuple(vec![NumLit("1")])]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1,) | abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "|",
+ Box::new(Tuple(vec![NumLit("1")])),
+ Box::new(Var("abs"))
+ ),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1, 2)|abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ Filter("abs", vec![Tuple(vec![NumLit("1"), NumLit("2")])]),
+ )],
+ );
+ assert_eq!(
+ super::parse("{{ (1, 2) | abs }}", &syntax).unwrap(),
+ vec![Node::Expr(
+ Ws(None, None),
+ BinOp(
+ "|",
+ Box::new(Tuple(vec![NumLit("1"), NumLit("2")])),
+ Box::new(Var("abs"))
+ ),
+ )],
+ );
+ }
+}
diff --git a/askama_derive/templates/a.html b/askama_derive/templates/a.html
new file mode 100644
index 0000000..257cc56
--- /dev/null
+++ b/askama_derive/templates/a.html
@@ -0,0 +1 @@
+foo
diff --git a/askama_derive/templates/b.html b/askama_derive/templates/b.html
new file mode 100644
index 0000000..5716ca5
--- /dev/null
+++ b/askama_derive/templates/b.html
@@ -0,0 +1 @@
+bar
diff --git a/askama_derive/templates/sub/b.html b/askama_derive/templates/sub/b.html
new file mode 100644
index 0000000..5716ca5
--- /dev/null
+++ b/askama_derive/templates/sub/b.html
@@ -0,0 +1 @@
+bar
diff --git a/askama_derive/templates/sub/c.html b/askama_derive/templates/sub/c.html
new file mode 100644
index 0000000..7601807
--- /dev/null
+++ b/askama_derive/templates/sub/c.html
@@ -0,0 +1 @@
+baz
diff --git a/askama_derive/templates/sub/sub1/d.html b/askama_derive/templates/sub/sub1/d.html
new file mode 100644
index 0000000..fa11a6a
--- /dev/null
+++ b/askama_derive/templates/sub/sub1/d.html
@@ -0,0 +1 @@
+echo
generated by cgit (git 2.34.1) at 2024-11-25 06:00:16 +0000