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https://github.com/carbon-language/carbon-lang.git
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Richard SmithandJon Ross-Perkins
ea60e4f491
This will be more correct if a user file is named prelude.carbon, and reduces the explorer runtime by about 10% by removing a string comparison from the check for whether trace output is enabled. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
74 lines
2.3 KiB
C++
74 lines
2.3 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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#ifndef CARBON_EXPLORER_SYNTAX_PARSE_AND_LEX_CONTEXT_H_
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#define CARBON_EXPLORER_SYNTAX_PARSE_AND_LEX_CONTEXT_H_
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#include <variant>
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#include "explorer/ast/ast.h"
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#include "explorer/common/source_location.h"
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#include "explorer/syntax/parser.h" // from parser.ypp
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namespace Carbon {
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// The state and functionality that is threaded "globally" through the
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// lexing/parsing process.
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class ParseAndLexContext {
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public:
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// Creates an instance analyzing the given input file.
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ParseAndLexContext(Nonnull<const std::string*> input_file_name,
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FileKind file_kind, bool parser_debug)
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: input_file_name_(input_file_name),
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file_kind_(file_kind),
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parser_debug_(parser_debug) {}
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// Formats ands records a lexing oor parsing error. Returns an error token as
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// a convenience.
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auto RecordSyntaxError(Error error) -> Parser::symbol_type;
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auto RecordSyntaxError(const std::string& message) -> Parser::symbol_type;
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auto source_loc() const -> SourceLocation {
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return SourceLocation(input_file_name_,
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static_cast<int>(current_token_position.begin.line),
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file_kind_);
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}
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auto parser_debug() const -> bool { return parser_debug_; }
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// The source range of the token being (or just) lex'd.
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location current_token_position;
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auto take_errors() -> std::vector<Error> {
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std::vector<Error> errors = std::move(errors_);
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errors_.clear();
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return errors;
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}
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private:
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// A path to the file processed, relative to the current working directory
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// when *this is called.
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Nonnull<const std::string*> input_file_name_;
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// The kind of file being processed.
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FileKind file_kind_;
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bool parser_debug_;
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std::vector<Error> errors_;
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};
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} // namespace Carbon
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// Gives flex the yylex prototype we want.
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#define YY_DECL \
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auto yylex(Carbon::Nonnull<Carbon::Arena*> /*arena*/, yyscan_t yyscanner, \
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Carbon::ParseAndLexContext& context) \
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->Carbon::Parser::symbol_type
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// Declares yylex for the parser's sake.
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YY_DECL;
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#endif // CARBON_EXPLORER_SYNTAX_PARSE_AND_LEX_CONTEXT_H_
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