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| 1 | //===-- include/flang/Parser/source.h ---------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef FORTRAN_PARSER_SOURCE_H_ |
| 10 | #define FORTRAN_PARSER_SOURCE_H_ |
| 11 | |
| 12 | // Source file content is lightly normalized when the file is read. |
| 13 | // - Line ending markers are converted to single newline characters |
| 14 | // - A newline character is added to the last line of the file if one is needed |
| 15 | // - A Unicode byte order mark is recognized if present. |
| 16 | |
| 17 | #include "characters.h" |
| 18 | #include "flang/Common/reference.h" |
| 19 | #include "llvm/Support/MemoryBuffer.h" |
| 20 | #include "llvm/Support/raw_ostream.h" |
| 21 | #include <cstddef> |
| 22 | #include <list> |
| 23 | #include <map> |
| 24 | #include <optional> |
| 25 | #include <set> |
| 26 | #include <string> |
| 27 | #include <utility> |
| 28 | #include <vector> |
| 29 | |
| 30 | namespace llvm { |
| 31 | class raw_ostream; |
| 32 | } |
| 33 | |
| 34 | namespace Fortran::parser { |
| 35 | |
| 36 | std::string DirectoryName(std::string path); |
| 37 | std::optional<std::string> LocateSourceFile( |
| 38 | std::string name, const std::list<std::string> &searchPath); |
| 39 | std::vector<std::string> LocateSourceFileAll( |
| 40 | std::string name, const std::vector<std::string> &searchPath); |
| 41 | |
| 42 | class SourceFile; |
| 43 | |
| 44 | struct SourcePosition { |
| 45 | common::Reference<const SourceFile> sourceFile; |
| 46 | common::Reference<const std::string> |
| 47 | path; // may not be sourceFile.path() when #line present |
| 48 | int line, column; |
| 49 | int trueLineNumber; |
| 50 | }; |
| 51 | |
| 52 | class SourceFile { |
| 53 | public: |
| 54 | explicit SourceFile(Encoding e) : encoding_{e} {} |
| 55 | ~SourceFile(); |
| 56 | const std::string &path() const { return path_; } |
| 57 | llvm::ArrayRef<char> content() const { |
| 58 | return buf_->getBuffer().slice(bom_end_, buf_end_ - bom_end_); |
| 59 | } |
| 60 | std::size_t bytes() const { return content().size(); } |
| 61 | std::size_t lines() const { return lineStart_.size(); } |
| 62 | Encoding encoding() const { return encoding_; } |
| 63 | |
| 64 | bool Open(std::string path, llvm::raw_ostream &error); |
| 65 | bool ReadStandardInput(llvm::raw_ostream &error); |
| 66 | void Close(); |
| 67 | SourcePosition GetSourcePosition(std::size_t) const; |
| 68 | std::size_t GetLineStartOffset(int lineNumber) const { |
| 69 | return lineStart_.at(lineNumber - 1); |
| 70 | } |
| 71 | const std::string &SavePath(std::string &&); |
| 72 | void LineDirective(int trueLineNumber, const std::string &, int); |
| 73 | llvm::raw_ostream &Dump(llvm::raw_ostream &) const; |
| 74 | |
| 75 | private: |
| 76 | struct SourcePositionOrigin { |
| 77 | const std::string &path; |
| 78 | int line; |
| 79 | }; |
| 80 | |
| 81 | void ReadFile(); |
| 82 | void IdentifyPayload(); |
| 83 | void RecordLineStarts(); |
| 84 | |
| 85 | std::string path_; |
| 86 | std::unique_ptr<llvm::WritableMemoryBuffer> buf_; |
| 87 | std::vector<std::size_t> lineStart_; |
| 88 | std::size_t bom_end_{0}; |
| 89 | std::size_t buf_end_; |
| 90 | Encoding encoding_; |
| 91 | std::set<std::string> distinctPaths_; |
| 92 | std::map<std::size_t, SourcePositionOrigin> origins_; |
| 93 | }; |
| 94 | } // namespace Fortran::parser |
| 95 | #endif // FORTRAN_PARSER_SOURCE_H_ |
| 96 |
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