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Chandler Carruth
dd0890619a
Just spotted these while looking at warnings that seem to fire on our code are probably are things we'd fix if we saw them. None of these seem important FWIW. Also removes a redundant flag that is part of `-Wall`. I have a follow-up for the high-value warning I spotted that motivated me to look at all of this. But it's noisy so kept it as a separate PR.
59 lines
2.0 KiB
C++
59 lines
2.0 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_EXPLORER_SYNTAX_LEX_SCAN_HELPER_H_
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#define CARBON_EXPLORER_SYNTAX_LEX_SCAN_HELPER_H_
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#include <string>
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#include "explorer/syntax/parse_and_lex_context.h"
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#include "explorer/syntax/parser.h"
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// Exposes yyinput; defined in lexer.lpp.
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extern auto YyinputWrapper(yyscan_t yyscanner) -> int;
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namespace Carbon {
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class StringLexHelper {
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public:
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StringLexHelper(const char* text, yyscan_t yyscanner,
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Carbon::ParseAndLexContext& context)
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: str_(text), yyscanner_(yyscanner), context_(context), is_eof_(false) {}
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// Advances yyscanner by one char. Sets is_eof to true and returns false on
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// EOF.
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auto Advance() -> bool;
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// Returns the last scanned char.
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auto last_char() -> char { return str_.back(); }
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// Returns the scanned string.
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auto str() -> const std::string& { return str_; }
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auto is_eof() -> bool { return is_eof_; }
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private:
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std::string str_;
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yyscan_t yyscanner_;
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Carbon::ParseAndLexContext& context_;
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// Skips reading next char.
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bool is_eof_;
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};
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// Tries to Read `hashtag_num` hashtags. Returns true on success.
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// Reads `hashtag_num` characters on success, and number of consecutive hashtags
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// (< `hashtag_num`) + 1 characters on failure.
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auto ReadHashTags(Carbon::StringLexHelper& scan_helper, size_t hashtag_num)
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-> bool;
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// Removes quotes and escapes a single line string. Reports an error on
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// invalid escaping.
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auto ProcessSingleLineString(llvm::StringRef str,
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Carbon::ParseAndLexContext& context,
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size_t hashtag_num) -> Carbon::Parser::symbol_type;
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auto ProcessMultiLineString(llvm::StringRef str,
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Carbon::ParseAndLexContext& context,
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size_t hashtag_num) -> Carbon::Parser::symbol_type;
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} // namespace Carbon
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#endif // CARBON_EXPLORER_SYNTAX_LEX_SCAN_HELPER_H_
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