mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 16:30:13 +01:00
Jon Meow
90f04700e2
With this, only main.cpp instantiates an arena. Maybe we'll want to split that up more later (e.g., so that the runtime interpreter uses its own arena), but given the intent to have type-checking update the AST, I thought this was a reasonable approach for now in order to avoid ownership complexities. Fixes #769
56 lines
1.6 KiB
C++
56 lines
1.6 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 "common/check.h"
|
|
#include "executable_semantics/common/error.h"
|
|
#include "executable_semantics/common/tracing_flag.h"
|
|
#include "executable_semantics/syntax/lexer.h"
|
|
#include "executable_semantics/syntax/parse_and_lex_context.h"
|
|
#include "executable_semantics/syntax/parser.h"
|
|
|
|
namespace Carbon {
|
|
|
|
auto Parse(Ptr<Arena> arena, const std::string& input_file_name)
|
|
-> std::variant<AST, SyntaxErrorCode> {
|
|
FILE* input_file = fopen(input_file_name.c_str(), "r");
|
|
if (input_file == nullptr) {
|
|
FATAL_PROGRAM_ERROR_NO_LINE() << "Error opening '" << input_file_name
|
|
<< "': " << std::strerror(errno);
|
|
}
|
|
|
|
// Prepare the lexer.
|
|
yyscan_t scanner;
|
|
yylex_init(&scanner);
|
|
yyset_in(input_file, scanner);
|
|
|
|
// Prepare other parser arguments.
|
|
std::optional<AST> ast = std::nullopt;
|
|
ParseAndLexContext context(arena->New<std::string>(input_file_name));
|
|
|
|
// Do the parse.
|
|
auto parser = Parser(arena, scanner, context, &ast);
|
|
if (tracing_output) {
|
|
parser.set_debug_level(1);
|
|
}
|
|
auto syntax_error_code = parser();
|
|
|
|
// Clean up the lexer.
|
|
fclose(input_file);
|
|
yylex_destroy(scanner);
|
|
|
|
// Return an error if appropriate.
|
|
if (syntax_error_code != 0) {
|
|
return syntax_error_code;
|
|
}
|
|
|
|
// Return parse results.
|
|
CHECK(ast != std::nullopt)
|
|
<< "parser validated syntax yet didn't produce an AST.";
|
|
return *ast;
|
|
}
|
|
|
|
} // namespace Carbon
|