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Normalize identifiers in librustc_parse.

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This commit is contained in:
Charles Lew 2019-11-23 22:33:40 +08:00
parent b13d65ab92
commit 0bcddfe23a
3 changed files with 22 additions and 4 deletions
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8
Cargo.lock
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@ -3696,6 +3696,7 @@ dependencies = [
"smallvec 1.0.0",
"syntax",
"syntax_pos",
"unicode-normalization",
]
[[package]]
@ -4913,9 +4914,12 @@ dependencies = [
[[package]]
name = "unicode-normalization"
version = "0.1.7"
version = "0.1.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6a0180bc61fc5a987082bfa111f4cc95c4caff7f9799f3e46df09163a937aa25"
checksum = "b561e267b2326bb4cebfc0ef9e68355c7abe6c6f522aeac2f5bf95d56c59bdcf"
dependencies = [
"smallvec 1.0.0",
]
[[package]]
name = "unicode-segmentation"

1
src/librustc_parse/Cargo.toml
View File

@ -20,3 +20,4 @@ rustc_error_codes = { path = "../librustc_error_codes" }
smallvec = { version = "1.0", features = ["union", "may_dangle"] }
syntax_pos = { path = "../libsyntax_pos" }
syntax = { path = "../libsyntax" }
unicode-normalization = "0.1.11"

17
src/librustc_parse/lexer/mod.rs
View File

@ -220,8 +220,7 @@ impl<'a> StringReader<'a> {
if is_raw_ident {
ident_start = ident_start + BytePos(2);
}
// FIXME: perform NFKC normalization here. (Issue #2253)
let sym = self.symbol_from(ident_start);
let sym = self.nfc_symbol_from(ident_start);
if is_raw_ident {
let span = self.mk_sp(start, self.pos);
if !sym.can_be_raw() {
@ -470,6 +469,20 @@ impl<'a> StringReader<'a> {
Symbol::intern(self.str_from_to(start, end))
}
/// As symbol_from, with the text normalized into Unicode NFC form.
fn nfc_symbol_from(&self, start: BytePos) -> Symbol {
use unicode_normalization::{is_nfc_quick, IsNormalized, UnicodeNormalization};
debug!("taking an normalized ident from {:?} to {:?}", start, self.pos);
let sym = self.str_from(start);
match is_nfc_quick(sym.chars()) {
IsNormalized::Yes => Symbol::intern(sym),
_ => {
let sym_str: String = sym.chars().nfc().collect();
Symbol::intern(&sym_str)
}
}
}
/// Slice of the source text spanning from `start` up to but excluding `end`.
fn str_from_to(&self, start: BytePos, end: BytePos) -> &str {
&self.src[self.src_index(start)..self.src_index(end)]