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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::BTreeMap;
use ast;
use ast::{Ident, Name, TokenTree};
use codemap::Span;
use ext::base::{ExtCtxt, MacEager, MacResult};
use ext::build::AstBuilder;
use parse::token;
use ptr::P;
use util::small_vector::SmallVector;
// Maximum width of any line in an extended error description (inclusive).
const MAX_DESCRIPTION_WIDTH: usize = 80;
thread_local! {
static REGISTERED_DIAGNOSTICS: RefCell<BTreeMap<Name, Option<Name>>> = {
RefCell::new(BTreeMap::new())
}
}
thread_local! {
static USED_DIAGNOSTICS: RefCell<BTreeMap<Name, Span>> = {
RefCell::new(BTreeMap::new())
}
}
fn with_registered_diagnostics<T, F>(f: F) -> T where
F: FnOnce(&mut BTreeMap<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 BTreeMap<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.len(), token_tree.get(0)) {
(1, Some(&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)
));
ecx.span_note(previous_span, "previous invocation");
},
None => ()
}
()
});
with_registered_diagnostics(|diagnostics| {
if !diagnostics.contains_key(&code.name) {
ecx.span_err(span, &format!(
"used diagnostic code {} not registered", &token::get_ident(code)
));
}
});
MacEager::expr(ecx.expr_tuple(span, Vec::new()))
}
pub fn expand_register_diagnostic<'cx>(ecx: &'cx mut ExtCtxt,
span: Span,
token_tree: &[TokenTree])
-> Box<MacResult+'cx> {
let (code, description) = match (
token_tree.len(),
token_tree.get(0),
token_tree.get(1),
token_tree.get(2)
) {
(1, Some(&ast::TtToken(_, token::Ident(ref code, _))), None, None) => {
(code, None)
},
(3, Some(&ast::TtToken(_, token::Ident(ref code, _))),
Some(&ast::TtToken(_, token::Comma)),
Some(&ast::TtToken(_, token::Literal(token::StrRaw(description, _), None)))) => {
(code, Some(description))
}
_ => unreachable!()
};
// Check that the description starts and ends with a newline and doesn't
// overflow the maximum line width.
description.map(|raw_msg| {
let msg = raw_msg.as_str();
if !msg.starts_with("\n") || !msg.ends_with("\n") {
ecx.span_err(span, &format!(
"description for error code {} doesn't start and end with a newline",
token::get_ident(*code)
));
}
if msg.lines().any(|line| line.len() > MAX_DESCRIPTION_WIDTH) {
ecx.span_err(span, &format!(
"description for error code {} contains a line longer than {} characters",
token::get_ident(*code), MAX_DESCRIPTION_WIDTH
));
}
raw_msg
});
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)
));
}
});
let sym = Ident::new(token::gensym(&(
"__register_diagnostic_".to_string() + &token::get_ident(*code)
)));
MacEager::items(SmallVector::many(vec![
ecx.item_mod(
span,
span,
sym,
Vec::new(),
Vec::new()
)
]))
}
pub fn expand_build_diagnostic_array<'cx>(ecx: &'cx mut ExtCtxt,
span: Span,
token_tree: &[TokenTree])
-> Box<MacResult+'cx> {
let name = match (token_tree.len(), token_tree.get(0)) {
(1, Some(&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))
});
let static_ = ecx.lifetime(span, ecx.name_of("'static"));
let ty_str = ecx.ty_rptr(
span,
ecx.ty_ident(span, ecx.ident_of("str")),
Some(static_),
ast::MutImmutable,
);
let ty = ecx.ty(
span,
ast::TyFixedLengthVec(
ecx.ty(
span,
ast::TyTup(vec![ty_str.clone(), ty_str])
),
ecx.expr_usize(span, count),
),
);
MacEager::items(SmallVector::many(vec![
P(ast::Item {
ident: name.clone(),
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
node: ast::ItemStatic(
ty,
ast::MutImmutable,
expr,
),
vis: ast::Public,
span: span,
})
]))
}
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