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46 lines
1.3 KiB
C++
46 lines
1.3 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 "executable_semantics/syntax/parse.h"
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#include <iostream>
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#include "executable_semantics/syntax/parse_and_lex_context.h"
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#include "executable_semantics/syntax/parser.h"
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#include "executable_semantics/tracing_flag.h"
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extern FILE* yyin;
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namespace Carbon {
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// Returns an abstract representation of the program contained in the
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// well-formed input file, or if the file was malformed, a description of the
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// problem.
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auto parse(const std::string& input_file_name)
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-> std::variant<AST, SyntaxErrorCode> {
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yyin = fopen(input_file_name.c_str(), "r");
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if (yyin == nullptr) {
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std::cerr << "Error opening '" << input_file_name
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<< "': " << std::strerror(errno) << std::endl;
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exit(1);
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}
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std::optional<AST> parsed_input = std::nullopt;
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ParseAndLexContext context(input_file_name);
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auto syntax_error_code = yy::parser(parsed_input, context)();
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if (syntax_error_code != 0) {
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return syntax_error_code;
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}
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if (parsed_input == std::nullopt) {
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std::cerr << "Internal error: parser validated syntax yet didn't produce "
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"an AST.\n";
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exit(1);
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}
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return *parsed_input;
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}
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} // namespace Carbon
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