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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::cell::RefCell;
use std::collections::HashMap;
use ast;
use ast::{Ident, Name, TokenTree};
use codemap::Span;
use ext::base::{ExtCtxt, MacExpr, MacResult, MacItems};
use ext::build::AstBuilder;
use parse::token;
use ptr::P;
thread_local! {
static REGISTERED_DIAGNOSTICS: RefCell<HashMap<Name, Option<Name>>> = {
RefCell::new(HashMap::new())
}
}
thread_local! {
static USED_DIAGNOSTICS: RefCell<HashMap<Name, Span>> = {
RefCell::new(HashMap::new())
}
}
fn with_registered_diagnostics<T, F>(f: F) -> T where
F: FnOnce(&mut HashMap<Name, Option<Name>>) -> T,
{
REGISTERED_DIAGNOSTICS.with(move |slot| {
f(&mut *slot.borrow_mut())
})
}
fn with_used_diagnostics<T, F>(f: F) -> T where
F: FnOnce(&mut HashMap<Name, Span>) -> T,
{
USED_DIAGNOSTICS.with(move |slot| {
f(&mut *slot.borrow_mut())
})
}
pub fn expand_diagnostic_used<'cx>(ecx: &'cx mut ExtCtxt,
span: Span,
token_tree: &[TokenTree])
-> Box<MacResult+'cx> {
let code = match token_tree {
[ast::TtToken(_, token::Ident(code, _))] => code,
_ => unreachable!()
};
with_used_diagnostics(|diagnostics| {
match diagnostics.insert(code.name, span) {
Some(previous_span) => {
ecx.span_warn(span, format!(
"diagnostic code {} already used", token::get_ident(code).get()
)[]);
ecx.span_note(previous_span, "previous invocation");
},
None => ()
}
()
});
MacExpr::new(quote_expr!(ecx, ()))
}
pub fn expand_register_diagnostic<'cx>(ecx: &'cx mut ExtCtxt,
span: Span,
token_tree: &[TokenTree])
-> Box<MacResult+'cx> {
let (code, description) = match token_tree {
[ast::TtToken(_, token::Ident(ref code, _))] => {
(code, None)
},
[ast::TtToken(_, token::Ident(ref code, _)),
ast::TtToken(_, token::Comma),
ast::TtToken(_, token::Literal(token::StrRaw(description, _), None))] => {
(code, Some(description))
}
_ => unreachable!()
};
with_registered_diagnostics(|diagnostics| {
if diagnostics.insert(code.name, description).is_some() {
ecx.span_err(span, format!(
"diagnostic code {} already registered", token::get_ident(*code).get()
)[]);
}
});
let sym = Ident::new(token::gensym((
"__register_diagnostic_".to_string() + token::get_ident(*code).get()
)[]));
MacItems::new(vec![quote_item!(ecx, mod $sym {}).unwrap()].into_iter())
}
pub fn expand_build_diagnostic_array<'cx>(ecx: &'cx mut ExtCtxt,
span: Span,
token_tree: &[TokenTree])
-> Box<MacResult+'cx> {
let name = match token_tree {
[ast::TtToken(_, token::Ident(ref name, _))] => name,
_ => unreachable!()
};
let (count, expr) =
with_registered_diagnostics(|diagnostics| {
let descriptions: Vec<P<ast::Expr>> =
diagnostics.iter().filter_map(|(code, description)| {
description.map(|description| {
ecx.expr_tuple(span, vec![
ecx.expr_str(span, token::get_name(*code)),
ecx.expr_str(span, token::get_name(description))])
})
}).collect();
(descriptions.len(), ecx.expr_vec(span, descriptions))
});
MacItems::new(vec![quote_item!(ecx,
pub static $name: [(&'static str, &'static str); $count] = $expr;
).unwrap()].into_iter())
}
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