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extern crate askama_shared as shared;
#[macro_use]
extern crate nom;
extern crate proc_macro;
#[macro_use]
extern crate quote;
#[macro_use(parse_quote)]
extern crate syn;
mod input;
mod generator;
mod parser;
use input::Print;
use parser::{Macro, Node};
use proc_macro::TokenStream;
use shared::path;
use std::borrow::Cow;
use std::collections::HashMap;
use std::path::Path;
#[proc_macro_derive(Template, attributes(template))]
pub fn derive_template(input: TokenStream) -> TokenStream {
let ast: syn::DeriveInput = syn::parse(input).unwrap();
match ast.data {
syn::Data::Struct(ref data) => data,
_ => panic!("#[derive(Template)] can only be used with structs"),
};
build_template(&ast).parse().unwrap()
}
/// 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) -> String {
let data = input::TemplateInput::new(ast);
let nodes = parser::parse(data.source.as_ref());
let imports = Imports::new(&nodes, &data.path);
if data.meta.print == Print::Ast || data.meta.print == Print::All {
println!("{:?}", nodes);
}
let code = generator::generate(&data, &nodes, &imports.macro_map());
if data.meta.print == Print::Code || data.meta.print == Print::All {
println!("{}", code);
}
code
}
struct Imports<'a> {
sources: HashMap<&'a str, Cow<'a, str>>,
}
impl<'a> Imports<'a> {
fn new(parent_nodes: &'a [Node], parent_path: &'a Path) -> Imports<'a> {
let sources = parent_nodes.iter().filter_map(|n| {
match *n {
Node::Import(_, import_path, scope) => {
let path = path::find_template_from_path(import_path, Some(parent_path));
let src = path::get_template_source(&path);
Some((scope, Cow::Owned(src)))
},
_ => None,
}
}).collect();
Imports { sources }
}
fn macro_map(&'a self) -> HashMap<(&'a str, &'a str), Macro<'a>> {
let mut macro_map = HashMap::new();
for (scope, s) in &self.sources {
for n in parser::parse(s.as_ref()) {
match n {
Node::Macro(name, m) => macro_map.insert((*scope, name), m),
_ => None,
};
}
}
macro_map
}
}
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