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#[macro_use] extern crate procedural_masquerade;
extern crate phf_codegen;
extern crate proc_macro;
extern crate proc_macro2;
#[macro_use] extern crate quote;
extern crate syn;
#[allow(unused_imports)] use std::ascii::AsciiExt;
use quote::TokenStreamExt;
use std::iter;
use proc_macro2::{TokenStream, TokenTree};
define_proc_macros! {
#[allow(non_snake_case)]
pub fn cssparser_internal__assert_ascii_lowercase__max_len(input: &str) -> String {
let expr = syn::parse_str(&format!("match x {{ {} }}", input)).unwrap();
let arms = match expr {
syn::Expr::Match(syn::ExprMatch { arms, .. }) => arms,
_ => panic!("expected a match expression, got {:?}", expr)
};
max_len(arms.into_iter().flat_map(|arm| arm.pats).filter_map(|pattern| {
let expr = match pattern {
syn::Pat::Lit(expr) => expr,
syn::Pat::Wild(_) => return None,
_ => panic!("expected string or wildcard pattern, got {:?}", pattern)
};
match *expr.expr {
syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Str(ref lit), .. }) => {
assert_eq!(lit.value(), lit.value().to_ascii_lowercase(),
"string patterns must be given in ASCII lowercase");
Some(lit.value().len())
}
_ => panic!("expected string pattern, got {:?}", expr)
}
}))
}
#[allow(non_snake_case)]
pub fn cssparser_internal__max_len(input: &str) -> String {
max_len(syn::parse_str::<TokenStream>(input).unwrap().into_iter().map(|tt| string_literal(&tt).len()))
}
#[allow(non_snake_case)]
pub fn cssparser_internal__phf_map(input: &str) -> String {
let token_trees: Vec<TokenTree> = syn::parse_str::<TokenStream>(input).unwrap().into_iter().collect();
let value_type = &token_trees[0];
let pairs: Vec<_> = token_trees[1..].chunks(2).map(|chunk| {
let key = string_literal(&chunk[0]);
let value = &chunk[1];
(key.to_ascii_lowercase(), quote!(#value).to_string())
}).collect();
let mut map = phf_codegen::Map::new();
map.phf_path("::cssparser::_internal__phf");
for &(ref key, ref value) in &pairs {
map.entry(&**key, &**value);
}
let mut tokens = quote! {
static MAP: ::cssparser::_internal__phf::Map<&'static str, #value_type> =
};
let mut initializer_bytes = Vec::new();
map.build(&mut initializer_bytes).unwrap();
tokens.append_all(syn::parse_str::<syn::Expr>(::std::str::from_utf8(&initializer_bytes).unwrap()));
tokens.append_all(quote!(;));
tokens.to_string()
}
}
fn max_len<I: Iterator<Item=usize>>(lengths: I) -> String {
let max_length = lengths.max().expect("expected at least one string");
quote!( const MAX_LENGTH: usize = #max_length; ).to_string()
}
fn string_literal(token: &TokenTree) -> String {
let lit: syn::LitStr = syn::parse2(iter::once(token.clone()).collect()).expect(&format!("expected string literal, got {:?}", token));
lit.value()
}