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86 lines
2.7 KiB
C++
86 lines
2.7 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 "common/check.h"
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#include "common/error.h"
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#include "executable_semantics/common/error_builders.h"
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#include "executable_semantics/syntax/lexer.h"
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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 "llvm/Support/Error.h"
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namespace Carbon {
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auto ParseImpl(yyscan_t scanner, Nonnull<Arena*> arena,
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std::string_view input_file_name, bool trace) -> ErrorOr<AST> {
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// Prepare other parser arguments.
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std::optional<AST> ast = std::nullopt;
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ParseAndLexContext context(arena->New<std::string>(input_file_name), trace);
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// Do the parse.
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auto parser = Parser(arena, scanner, context, &ast);
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if (trace) {
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parser.set_debug_level(1);
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}
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if (auto syntax_error_code = parser(); syntax_error_code != 0) {
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const std::string error_message = context.error_messages().empty()
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? "Unknown parser error"
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: context.error_messages()[0];
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return Error(error_message);
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}
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// Return parse results.
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CHECK(ast != std::nullopt)
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<< "parser validated syntax yet didn't produce an AST.";
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return *ast;
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}
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auto Parse(Nonnull<Arena*> arena, std::string_view input_file_name, bool trace)
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-> ErrorOr<AST> {
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std::string name_str(input_file_name);
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FILE* input_file = fopen(name_str.c_str(), "r");
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if (input_file == nullptr) {
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return ProgramError(SourceLocation(name_str.c_str(), 0))
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<< "Error opening file: " << std::strerror(errno);
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}
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// Prepare the lexer.
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yyscan_t scanner;
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yylex_init(&scanner);
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auto buffer = yy_create_buffer(input_file, YY_BUF_SIZE, scanner);
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yy_switch_to_buffer(buffer, scanner);
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ErrorOr<AST> result = ParseImpl(scanner, arena, input_file_name, trace);
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// Clean up the lexer.
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yy_delete_buffer(buffer, scanner);
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yylex_destroy(scanner);
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fclose(input_file);
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return result;
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}
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auto ParseFromString(Nonnull<Arena*> arena, std::string_view input_file_name,
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std::string_view file_contents, bool trace)
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-> ErrorOr<AST> {
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// Prepare the lexer.
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yyscan_t scanner;
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yylex_init(&scanner);
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auto buffer =
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yy_scan_bytes(file_contents.data(), file_contents.size(), scanner);
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yy_switch_to_buffer(buffer, scanner);
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ErrorOr<AST> result = ParseImpl(scanner, arena, input_file_name, trace);
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// Clean up the lexer.
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yy_delete_buffer(buffer, scanner);
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yylex_destroy(scanner);
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return result;
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}
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} // namespace Carbon
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