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speed up lint using blocks and types

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This commit is contained in:
llogiq 2016-02-09 06:18:08 +01:00
parent 3b0b9e0e06
commit 275795fab3
1 changed files with 19 additions and 15 deletions
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34
src/regex.rs
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@ -5,12 +5,12 @@ use syntax::ast::Lit_::LitStr;
use syntax::codemap::{Span, BytePos};
use syntax::parse::token::InternedString;
use rustc_front::hir::*;
use rustc_front::intravisit::{Visitor, walk_expr};
use rustc_front::intravisit::{Visitor, walk_block};
use rustc::middle::const_eval::{eval_const_expr_partial, ConstVal};
use rustc::middle::const_eval::EvalHint::ExprTypeChecked;
use rustc::lint::*;
use utils::{is_expn_of, match_path, REGEX_NEW_PATH, span_lint, span_help_and_lint};
use utils::{is_expn_of, match_path, match_type, REGEX_NEW_PATH, span_lint, span_help_and_lint};
/// **What it does:** This lint checks `Regex::new(_)` invocations for correct regex syntax.
///
@ -167,19 +167,23 @@ struct RegexVisitor<'v, 't: 'v> {
}
impl<'v, 't: 'v> Visitor<'v> for RegexVisitor<'v, 't> {
fn visit_expr(&mut self, expr: &'v Expr) {
if let Some(span) = is_expn_of(self.cx, expr.span, "regex") {
if self.spans.contains(&span) {
fn visit_block(&mut self, block: &'v Block) {
if_let_chain!{[
let Some(ref expr) = block.expr,
match_type(self.cx, self.cx.tcx.expr_ty(expr), &["regex", "re", "Regex"]),
let Some(span) = is_expn_of(self.cx, expr.span, "regex")
], {
if self.spans.contains(&span) {
return;
}
span_lint(self.cx,
REGEX_MACRO,
span,
"`regex!(_)` found. \
Please use `Regex::new(_)`, which is faster for now.");
self.spans.insert(span);
return;
}
span_lint(self.cx,
REGEX_MACRO,
span,
"`regex!(_)` found. \
Please use `Regex::new(_)`, which is faster for now.");
self.spans.insert(span);
return;
}
walk_expr(self, expr);
}}
walk_block(self, block);
}
}