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Jon Ross-PerkinsandChandler Carruth
ec182fb00d
Continuing with #3070. Just a dir and file rename (only prefix change is lexer_file_test). Everything in the lex dir should be marked as a move. Note, I think this closes #3070. There may still be further cleanup later, but the organizational changes suggested there are being completed. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
54 lines
1.9 KiB
C++
54 lines
1.9 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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#ifndef CARBON_TOOLCHAIN_LEX_TEST_HELPERS_H_
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#define CARBON_TOOLCHAIN_LEX_TEST_HELPERS_H_
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#include <gmock/gmock.h>
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#include <array>
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#include "common/check.h"
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#include "common/string_helpers.h"
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#include "toolchain/diagnostics/diagnostic_emitter.h"
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namespace Carbon::Testing {
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// A diagnostic translator for tests that lex a single token. Produces
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// locations such as "`12.5`:1:3" to refer to the third character in the token.
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class SingleTokenDiagnosticTranslator
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: public DiagnosticLocationTranslator<const char*> {
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public:
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// Form a translator for a given token. The string provided here must refer
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// to the same character array that we are going to lex.
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explicit SingleTokenDiagnosticTranslator(llvm::StringRef token)
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: token_(token) {}
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auto GetLocation(const char* pos) -> DiagnosticLocation override {
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CARBON_CHECK(StringRefContainsPointer(token_, pos))
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<< "invalid diagnostic location";
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llvm::StringRef prefix = token_.take_front(pos - token_.begin());
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auto [before_last_newline, this_line] = prefix.rsplit('\n');
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if (before_last_newline.size() == prefix.size()) {
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// On first line.
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return {.line_number = 1,
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.column_number = static_cast<int32_t>(pos - token_.begin() + 1)};
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} else {
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// On second or subsequent lines. Note that the line number here is 2
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// more than the number of newlines because `rsplit` removed one newline
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// and `line_number` is 1-based.
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return {.line_number =
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static_cast<int32_t>(before_last_newline.count('\n') + 2),
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.column_number = static_cast<int32_t>(this_line.size() + 1)};
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}
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}
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private:
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llvm::StringRef token_;
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};
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} // namespace Carbon::Testing
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#endif // CARBON_TOOLCHAIN_LEX_TEST_HELPERS_H_
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