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pk19604014andGeoff Romer
2017eb4da0
* Initial implementation of block string literals following lexical_conventions/string_literals.md. Enabled yyinput() in flex to implement parsing. Added ParseBlockStringLiteral() helper to handler further transformations such as indenting. Modified formar_grammar to support single-quoted strings to prevent a failure on lexer.lpp. * Fixed _find_string_end quote parameter type int -> str. * Update executable_semantics/syntax/BUILD Co-authored-by: Geoff Romer <gromer@google.com> * Addressed code review comments - split table-drived test into individual tests, renamed constants to match style guide. * Addressed code review comments -- using EXPECT_THAT_EXPECTED() in tests, lexer comments and code cleanup. Co-authored-by: Geoff Romer <gromer@google.com>
56 lines
1.8 KiB
C++
56 lines
1.8 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 EXECUTABLE_SEMANTICS_SYNTAX_DRIVER_H_
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#define EXECUTABLE_SEMANTICS_SYNTAX_DRIVER_H_
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#include <variant>
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#include "executable_semantics/ast/ast.h"
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#include "executable_semantics/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, bool trace)
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: input_file_name_(input_file_name), trace_(trace) {}
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// Writes a syntax error diagnostic containing message to standard error.
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auto PrintDiagnostic(const std::string& message) -> void;
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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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}
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auto trace() const -> bool { return trace_; }
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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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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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bool trace_;
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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 // EXECUTABLE_SYNTAX_DRIVER_H_
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