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use std::collections::BTreeMap;
use crate::ast::{self, Ident, Name};
use crate::source_map;
use crate::ext::base::{ExtCtxt, MacEager, MacResult};
use crate::parse::token::{self, Token};
use crate::ptr::P;
use crate::symbol::kw;
use crate::tokenstream::{TokenTree};
use smallvec::smallvec;
use syntax_pos::Span;
pub use errors::*;
const MAX_DESCRIPTION_WIDTH: usize = 80;
pub struct ErrorInfo {
pub description: Option<Name>,
pub use_site: Option<Span>
}
pub type ErrorMap = BTreeMap<Name, ErrorInfo>;
pub fn expand_diagnostic_used<'cx>(ecx: &'cx mut ExtCtxt<'_>,
span: Span,
token_tree: &[TokenTree])
-> Box<dyn MacResult+'cx> {
let code = match token_tree {
[
TokenTree::Token(Token { kind: token::Ident(code, _), .. })
] => code,
_ => unreachable!()
};
ecx.parse_sess.registered_diagnostics.with_lock(|diagnostics| {
match diagnostics.get_mut(&code) {
Some(&mut ErrorInfo { description: _, use_site: Some(previous_span) }) => {
ecx.struct_span_warn(span, &format!(
"diagnostic code {} already used", code
)).span_note(previous_span, "previous invocation")
.emit();
}
Some(ref mut info) => {
info.use_site = Some(span);
}
None => {
ecx.span_err(span, &format!(
"used diagnostic code {} not registered", 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<dyn MacResult+'cx> {
let (code, description) = match token_tree {
[
TokenTree::Token(Token { kind: token::Ident(code, _), .. })
] => {
(*code, None)
},
[
TokenTree::Token(Token { kind: token::Ident(code, _), .. }),
TokenTree::Token(Token { kind: token::Comma, .. }),
TokenTree::Token(Token { kind: token::Literal(token::Lit { symbol, .. }), ..})
] => {
(*code, Some(*symbol))
},
_ => unreachable!()
};
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",
code
));
}
let is_url = |l: &str| l.starts_with("[") && l.contains("]:") && l.contains("http");
if msg.lines().any(|line| line.len() > MAX_DESCRIPTION_WIDTH && !is_url(line)) {
ecx.span_err(span, &format!(
"description for error code {} contains a line longer than {} characters.\n\
if you're inserting a long URL use the footnote style to bypass this check.",
code, MAX_DESCRIPTION_WIDTH
));
}
});
ecx.parse_sess.registered_diagnostics.with_lock(|diagnostics| {
let info = ErrorInfo {
description,
use_site: None
};
if diagnostics.insert(code, info).is_some() {
ecx.span_err(span, &format!(
"diagnostic code {} already registered", code
));
}
});
MacEager::items(smallvec![])
}
pub fn expand_build_diagnostic_array<'cx>(ecx: &'cx mut ExtCtxt<'_>,
span: Span,
token_tree: &[TokenTree])
-> Box<dyn MacResult+'cx> {
assert_eq!(token_tree.len(), 3);
let ident = match &token_tree[2] {
&TokenTree::Token(Token { kind: token::Ident(name, _), span })
=> Ident::new(name, span),
_ => unreachable!()
};
let (count, expr) =
ecx.parse_sess.registered_diagnostics.with_lock(|diagnostics| {
let descriptions: Vec<P<ast::Expr>> =
diagnostics.iter().filter_map(|(&code, info)| {
info.description.map(|description| {
ecx.expr_tuple(span, vec![
ecx.expr_str(span, code),
ecx.expr_str(span, description)
])
})
}).collect();
(descriptions.len(), ecx.expr_vec(span, descriptions))
});
let static_ = ecx.lifetime(span, Ident::with_dummy_span(kw::StaticLifetime));
let ty_str = ecx.ty_rptr(
span,
ecx.ty_ident(span, ecx.ident_of("str")),
Some(static_),
ast::Mutability::Immutable,
);
let ty = ecx.ty(
span,
ast::TyKind::Array(
ecx.ty(
span,
ast::TyKind::Tup(vec![ty_str.clone(), ty_str])
),
ast::AnonConst {
id: ast::DUMMY_NODE_ID,
value: ecx.expr_usize(span, count),
},
),
);
MacEager::items(smallvec![
P(ast::Item {
ident,
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
node: ast::ItemKind::Const(
ty,
expr,
),
vis: source_map::respan(span.shrink_to_lo(), ast::VisibilityKind::Public),
span,
tokens: None,
})
])
}