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