mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 16:50:16 +01:00
Geoff Romer
e324935139
- Give unary `-` and `not` the same precedence as in C++ - Add detail to parse error messages, and make the --trace flag also enable parser debug tracing - Make any new shift-reduce conflicts into build errors - Use `%precedence` rather than `%nonassoc` where possible, in order to catch more grammar bugs at build time
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "executable_semantics/syntax/parse.h"
|
|
|
|
#include <iostream>
|
|
|
|
#include "executable_semantics/syntax/parse_and_lex_context.h"
|
|
#include "executable_semantics/syntax/parser.h"
|
|
#include "executable_semantics/tracing_flag.h"
|
|
|
|
extern FILE* yyin;
|
|
|
|
namespace Carbon {
|
|
|
|
// Returns an abstract representation of the program contained in the
|
|
// well-formed input file, or if the file was malformed, a description of the
|
|
// problem.
|
|
auto parse(const std::string& input_file_name)
|
|
-> std::variant<AST, SyntaxErrorCode> {
|
|
yyin = fopen(input_file_name.c_str(), "r");
|
|
if (yyin == nullptr) {
|
|
std::cerr << "Error opening '" << input_file_name
|
|
<< "': " << std::strerror(errno) << std::endl;
|
|
exit(1);
|
|
}
|
|
|
|
std::optional<AST> parsed_input = std::nullopt;
|
|
ParseAndLexContext context(input_file_name);
|
|
|
|
auto parser = yy::parser(parsed_input, context);
|
|
if (tracing_output) {
|
|
parser.set_debug_level(1);
|
|
}
|
|
auto syntax_error_code = parser();
|
|
if (syntax_error_code != 0) {
|
|
return syntax_error_code;
|
|
}
|
|
|
|
if (parsed_input == std::nullopt) {
|
|
std::cerr << "Internal error: parser validated syntax yet didn't produce "
|
|
"an AST.\n";
|
|
exit(1);
|
|
}
|
|
return *parsed_input;
|
|
}
|
|
|
|
} // namespace Carbon
|