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reader/spirv: Allow leading underscore in identifiers

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Bug: tint:1292
Change-Id: I738c981f503545075115101a3ead30941a19d95a
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/72320
Reviewed-by: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
This commit is contained in:
Ben Clayton 2021-12-09 16:55:04 +00:00 committed by Tint LUCI CQ
parent 01e4b54497
commit 4e6e113816
2 changed files with 11 additions and 3 deletions
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9
src/reader/spirv/parser_impl.cc
View File

@ -750,7 +750,14 @@ bool ParserImpl::IsValidIdentifier(const std::string& str) {
return false;
}
std::locale c_locale("C");
if (!std::isalpha(str[0], c_locale)) {
if (str[0] == '_') {
if (str.length() == 1u || str[1] == '_') {
// https://www.w3.org/TR/WGSL/#identifiers
// must not be '_' (a single underscore)
// must not start with two underscores
return false;
}
} else if (!std::isalpha(str[0], c_locale)) {
return false;
}
for (const char& ch : str) {

5
src/reader/spirv/parser_impl_test.cc
View File

@ -202,8 +202,9 @@ TEST_F(SpvParserTest, Impl_Source_InvalidId) {
TEST_F(SpvParserTest, Impl_IsValidIdentifier) {
EXPECT_FALSE(ParserImpl::IsValidIdentifier("")); // empty
EXPECT_FALSE(
ParserImpl::IsValidIdentifier("_")); // leading underscore, but ok later
EXPECT_FALSE(ParserImpl::IsValidIdentifier("_"));
EXPECT_FALSE(ParserImpl::IsValidIdentifier("__"));
EXPECT_TRUE(ParserImpl::IsValidIdentifier("_x"));
EXPECT_FALSE(
ParserImpl::IsValidIdentifier("9")); // leading digit, but ok later
EXPECT_FALSE(ParserImpl::IsValidIdentifier(" ")); // leading space