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extern crate proc_macro;
use proc_macro::TokenStream;
#[allow(non_snake_case)]
#[proc_macro]
pub fn cssparser_internal__assert_ascii_lowercase__max_len(input: TokenStream) -> TokenStream {
let expr: syn::ExprMatch = syn::parse_macro_input!(input);
let strings = expr
.arms
.iter()
.flat_map(|arm| match arm.pat {
syn::Pat::Or(ref p) => p.cases.iter().collect(),
ref p => vec![p],
})
.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)
}
_ => panic!("expected string pattern, got {:?}", expr),
}
});
max_len(strings)
}
#[allow(non_snake_case)]
#[proc_macro]
pub fn cssparser_internal__max_len(input: TokenStream) -> TokenStream {
struct Input(Vec<syn::LitStr>);
impl syn::parse::Parse for Input {
fn parse(input: syn::parse::ParseStream) -> syn::parse::Result<Self> {
let mut strings = Vec::new();
while !input.is_empty() {
strings.push(input.parse()?)
}
Ok(Self(strings))
}
}
let strings: Input = syn::parse_macro_input!(input);
max_len(strings.0.iter())
}
fn max_len<'a, I: Iterator<Item = &'a syn::LitStr>>(strings: I) -> TokenStream {
let max_length = strings
.map(|s| s.value().len())
.max()
.expect("expected at least one string");
quote::quote!( pub(super) const MAX_LENGTH: usize = #max_length; ).into()
}
#[allow(non_snake_case)]
#[proc_macro]
pub fn cssparser_internal__phf_map(input: TokenStream) -> TokenStream {
struct Input {
value_type: syn::Type,
keys: Vec<syn::LitStr>,
values: Vec<syn::Expr>,
}
impl syn::parse::Parse for Input {
fn parse(input: syn::parse::ParseStream) -> syn::parse::Result<Self> {
let mut keys = Vec::new();
let mut values = Vec::new();
let value_type = input.parse()?;
while !input.is_empty() {
keys.push(input.parse()?);
values.push(input.parse()?);
}
Ok(Input {
value_type,
keys,
values,
})
}
}
let Input {
value_type,
keys,
values,
} = syn::parse_macro_input!(input);
let keys = keys
.iter()
.map(|s| syn::LitStr::new(&s.value().to_ascii_lowercase(), s.span()));
quote::quote!(
pub(super) static MAP: Map<&'static str, #value_type> = phf_map! {
#(
#keys => #values,
)*
};
)
.into()
}