8d0f44fb91
Original-commit: flang-compiler/f18@522822fd5a Reviewed-on: https://github.com/flang-compiler/f18/pull/118
68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_PARSER_STMT_PARSER_H_
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#define FORTRAN_PARSER_STMT_PARSER_H_
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// Basic parsing of statements.
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#include "basic-parsers.h"
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#include "token-parsers.h"
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namespace Fortran::parser {
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// statement(p) parses Statement<P> for some statement type P that is the
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// result type of the argument parser p, while also handling labels and
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// end-of-statement markers.
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// R611 label -> digit [digit]...
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constexpr auto label = space >> digitString / spaceCheck;
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template<typename PA> inline constexpr auto unterminatedStatement(const PA &p) {
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return skipEmptyLines >>
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sourced(construct<Statement<typename PA::resultType>>(
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maybe(label), space >> p));
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}
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constexpr auto endOfLine = "\n"_ch / skipEmptyLines ||
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consumedAllInput >> pure("\n") ||
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fail<const char *>("expected end of line"_err_en_US);
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constexpr auto endOfStmt = space >>
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(";"_ch / skipMany(";"_tok) / maybe(endOfLine) || endOfLine);
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template<typename PA> inline constexpr auto statement(const PA &p) {
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return unterminatedStatement(p) / endOfStmt;
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}
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constexpr auto ignoredStatementPrefix = skipEmptyLines >> maybe(label) >>
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maybe(name / ":") >> space;
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// Error recovery within statements: skip to the end of the line,
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// but not over an END or CONTAINS statement.
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constexpr auto errorRecovery = construct<ErrorRecovery>();
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constexpr auto skipToEndOfLine = SkipTo<'\n'>{} >> errorRecovery;
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constexpr auto stmtErrorRecovery =
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!"END"_tok >> !"CONTAINS"_tok >> skipToEndOfLine;
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// Error recovery across statements: skip the line, unless it looks
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// like it might end the containing construct.
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constexpr auto errorRecoveryStart = ignoredStatementPrefix;
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constexpr auto skipBadLine = SkipPast<'\n'>{} >> errorRecovery;
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constexpr auto executionPartErrorRecovery = errorRecoveryStart >> !"END"_tok >>
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!"CONTAINS"_tok >> !"ELSE"_tok >> !"CASE"_tok >> !"TYPE IS"_tok >>
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!"CLASS"_tok >> !"RANK"_tok >> skipBadLine;
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} // namespace Fortran::parser
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#endif // FORTRAN_PARSER_STMT_PARSER_H_
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