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#[macro_use] extern crate procedural_masquerade;
extern crate phf_codegen;
extern crate proc_macro;
#[macro_use] extern crate quote;
extern crate syn;
use std::ascii::AsciiExt;
define_proc_macros! {
#[allow(non_snake_case)]
pub fn cssparser_internal__assert_ascii_lowercase__max_len(input: &str) -> String {
let expr = syn::parse_expr(&format!("match x {{ {} }}", input)).unwrap();
let arms = match expr {
syn::Expr { node: syn::ExprKind::Match(_, ref arms), .. } => arms,
_ => panic!("expected a match expression, got {:?}", expr)
};
max_len(arms.iter().flat_map(|arm| &arm.pats).filter_map(|pattern| {
let expr = match *pattern {
syn::Pat::Lit(ref expr) => expr,
syn::Pat::Wild => return None,
_ => panic!("expected string or wildcard pattern, got {:?}", pattern)
};
match **expr {
syn::Expr { node: syn::ExprKind::Lit(syn::Lit::Str(ref string, _)), .. } => {
assert_eq!(*string, string.to_ascii_lowercase(),
"string patterns must be given in ASCII lowercase");
Some(string.len())
}
_ => panic!("expected string pattern, got {:?}", expr)
}
}))
}
#[allow(non_snake_case)]
pub fn cssparser_internal__max_len(input: &str) -> String {
max_len(syn::parse_token_trees(input).unwrap().iter().map(|tt| string_literal(tt).len()))
}
#[allow(non_snake_case)]
pub fn cssparser_internal__phf_map(input: &str) -> String {
let token_trees = syn::parse_token_trees(input).unwrap();
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(::std::str::from_utf8(&initializer_bytes).unwrap());
tokens.append(";");
tokens.into_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; ).into_string()
}
fn string_literal(token: &syn::TokenTree) -> &str {
match *token {
syn::TokenTree::Token(syn::Token::Literal(syn::Lit::Str(ref string, _))) => string,
_ => panic!("expected string literal, got {:?}", token)
}
}