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|
use shared::path;
use std::path::{Path, PathBuf};
use syn;
pub struct TemplateInput<'a> {
pub ast: &'a syn::DeriveInput,
pub meta: TemplateMeta,
pub path: PathBuf,
pub source: String,
}
impl<'a> TemplateInput<'a> {
pub fn new(ast: &'a syn::DeriveInput) -> TemplateInput<'a> {
let meta = TemplateMeta::new(ast);
let (path, source) = match meta.source {
Source::Source(ref s) => {
let path = match meta.ext {
Some(ref v) => PathBuf::from(format!("_.{}", v)),
None => PathBuf::new(),
};
(path, s.clone())
},
Source::Path(ref s) => {
let path = path::find_template_from_path(s, None);
let src = path::get_template_source(&path);
(path, src)
},
};
TemplateInput { ast, meta, path, source }
}
}
// Holds metadata for the template, based on the `template()` attribute.
pub struct TemplateMeta {
source: Source,
pub print: Print,
pub escaping: EscapeMode,
pub ext: Option<String>,
}
impl TemplateMeta {
fn new(ast: &syn::DeriveInput) -> TemplateMeta {
let attr = ast.attrs
.iter()
.find(|a| a.interpret_meta().unwrap().name() == "template");
if attr.is_none() {
panic!(format!("'template' attribute not found on struct '{}'", ast.ident));
}
let attr = attr.unwrap();
let mut source = None;
let mut print = Print::None;
let mut escaping = None;
let mut ext = None;
if let syn::Meta::List(ref inner) = attr.interpret_meta().unwrap() {
for nm_item in inner.nested.iter() {
if let syn::NestedMeta::Meta(ref item) = *nm_item {
if let syn::Meta::NameValue(ref pair) = *item {
match pair.ident.to_string().as_ref() {
"path" => if let syn::Lit::Str(ref s) = pair.lit {
if source.is_some() {
panic!("must specify 'source' or 'path', not both");
}
source = Some(Source::Path(s.value()));
} else {
panic!("template path must be string literal");
},
"source" => if let syn::Lit::Str(ref s) = pair.lit {
if source.is_some() {
panic!("must specify 'source' or 'path', not both");
}
source = Some(Source::Source(s.value()));
} else {
panic!("template source must be string literal");
},
"print" => if let syn::Lit::Str(ref s) = pair.lit {
print = s.value().into();
} else {
panic!("print value must be string literal");
},
"escape" => if let syn::Lit::Str(ref s) = pair.lit {
escaping = Some(s.value().into());
} else {
panic!("escape value must be string literal");
},
"ext" => if let syn::Lit::Str(ref s) = pair.lit {
ext = Some(s.value());
} else {
panic!("ext value must be string literal");
},
attr => panic!("unsupported annotation key '{}' found", attr),
}
}
}
}
}
let source = source.expect("template path or source not found in attributes");
match (&source, ext.is_some()) {
(&Source::Path(_), true) => {
panic!("'ext' attribute cannot be used with 'path' attribute")
},
(&Source::Source(_), false) => {
panic!("must include 'ext' attribute when using 'source' attribute")
},
_ => {},
}
let escaping = match escaping {
Some(m) => m,
None => {
let ext = match source {
Source::Path(ref p) =>
Path::new(p).extension().map(|s| s.to_str().unwrap()).unwrap_or(""),
Source::Source(_) => ext.as_ref().unwrap(), // Already panicked if None
};
if HTML_EXTENSIONS.contains(&ext) {
EscapeMode::Html
} else {
EscapeMode::None
}
},
};
TemplateMeta { source, print, escaping, ext }
}
}
enum Source {
Path(String),
Source(String),
}
#[derive(PartialEq)]
pub enum EscapeMode {
Html,
None,
}
impl From<String> for EscapeMode {
fn from(s: String) -> EscapeMode {
use self::EscapeMode::*;
match s.as_ref() {
"html" => Html,
"none" => None,
v => panic!("invalid value for escape option: {}", v),
}
}
}
#[derive(PartialEq)]
pub enum Print {
All,
Ast,
Code,
None,
}
impl From<String> for Print {
fn from(s: String) -> Print {
use self::Print::*;
match s.as_ref() {
"all" => All,
"ast" => Ast,
"code" => Code,
"none" => None,
v => panic!("invalid value for print option: {}", v),
}
}
}
const HTML_EXTENSIONS: [&str; 3] = ["html", "htm", "xml"];
|
