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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
94872ef6da
Fundamentally this `.Print()` is wrong for debug output at present because `.fixed_spelling()` can be empty. It's also inconsistent with other enums to use it. We frequently print tokens for debugging, and it's easy to forget to specify `.name()` there. Diagnostics use formatv, so we can provide a format_provider and address it in one spot that way. It also makes it harder to just forget to do the right thing.
90 lines
4.3 KiB
C++
90 lines
4.3 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/lexer/token_kind.h"
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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#include <cstring>
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#include "llvm/ADT/StringRef.h"
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namespace Carbon::Testing {
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namespace {
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using ::testing::MatchesRegex;
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// We restrict symbols to punctuation characters that are expected to be widely
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// available on modern keyboards used for programming.
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constexpr llvm::StringLiteral SymbolRegex =
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R"([\[\]{}!@#%^&*()/?\\|;:.,<>=+~-]+)";
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// We restrict keywords to be lowercase ASCII letters and underscores with one
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// exception: `Self`.
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constexpr llvm::StringLiteral KeywordRegex = "[a-z_]+|Self";
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#define CARBON_TOKEN(TokenName) \
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TEST(TokenKindTest, TokenName) { \
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EXPECT_FALSE(TokenKind::TokenName.is_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_keyword()); \
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EXPECT_EQ("", TokenKind::TokenName.fixed_spelling()); \
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}
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#define CARBON_SYMBOL_TOKEN(TokenName, Spelling) \
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TEST(TokenKindTest, TokenName) { \
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EXPECT_TRUE(TokenKind::TokenName.is_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_grouping_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_opening_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_closing_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_keyword()); \
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EXPECT_EQ(Spelling, TokenKind::TokenName.fixed_spelling()); \
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EXPECT_THAT(Spelling, MatchesRegex(SymbolRegex.str())); \
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}
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#define CARBON_OPENING_GROUP_SYMBOL_TOKEN(TokenName, Spelling, ClosingName) \
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TEST(TokenKindTest, TokenName) { \
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EXPECT_TRUE(TokenKind::TokenName.is_symbol()); \
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EXPECT_TRUE(TokenKind::TokenName.is_grouping_symbol()); \
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EXPECT_TRUE(TokenKind::TokenName.is_opening_symbol()); \
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EXPECT_EQ(TokenKind::ClosingName, TokenKind::TokenName.closing_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_closing_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_keyword()); \
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EXPECT_EQ(Spelling, TokenKind::TokenName.fixed_spelling()); \
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EXPECT_THAT(Spelling, MatchesRegex(SymbolRegex.str())); \
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}
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#define CARBON_CLOSING_GROUP_SYMBOL_TOKEN(TokenName, Spelling, OpeningName) \
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TEST(TokenKindTest, TokenName) { \
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EXPECT_TRUE(TokenKind::TokenName.is_symbol()); \
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EXPECT_TRUE(TokenKind::TokenName.is_grouping_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_opening_symbol()); \
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EXPECT_TRUE(TokenKind::TokenName.is_closing_symbol()); \
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EXPECT_EQ(TokenKind::OpeningName, TokenKind::TokenName.opening_symbol()); \
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EXPECT_FALSE(TokenKind::TokenName.is_keyword()); \
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EXPECT_EQ(Spelling, TokenKind::TokenName.fixed_spelling()); \
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EXPECT_THAT(Spelling, MatchesRegex(SymbolRegex.str())); \
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}
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#define CARBON_KEYWORD_TOKEN(TokenName, Spelling) \
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TEST(TokenKindTest, TokenName) { \
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EXPECT_FALSE(TokenKind::TokenName.is_symbol()); \
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EXPECT_TRUE(TokenKind::TokenName.is_keyword()); \
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EXPECT_EQ(Spelling, TokenKind::TokenName.fixed_spelling()); \
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EXPECT_THAT(Spelling, MatchesRegex(KeywordRegex.str())); \
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}
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#include "toolchain/lexer/token_kind.def"
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// Verify that the symbol tokens are sorted from longest to shortest. This is
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// important to ensure that simply in-order testing will identify tokens
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// following the max-munch rule.
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TEST(TokenKindTest, SymbolsInDescendingLength) {
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int previous_length = INT_MAX;
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#define CARBON_SYMBOL_TOKEN(TokenName, Spelling) \
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EXPECT_LE(llvm::StringRef(Spelling).size(), previous_length) \
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<< "Symbol token not in descending length order: " << #TokenName; \
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previous_length = llvm::StringRef(Spelling).size();
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#include "toolchain/lexer/token_kind.def"
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EXPECT_GT(previous_length, 0);
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}
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} // namespace
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} // namespace Carbon::Testing
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