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37 * Implements gmx::TextReader.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
44 #include "textreader.h"
46 #include "gromacs/utility/filestream.h"
47 #include "gromacs/utility/nodelete.h"
48 #include "gromacs/utility/textstream.h"
54 std::string TextReader::readFileToString(const char* filename)
56 TextReader reader(filename);
57 std::string result(reader.readAll());
63 std::string TextReader::readFileToString(const std::string& filename)
65 return readFileToString(filename.c_str());
68 //! Implementation class
69 class TextReader::Impl
73 explicit Impl(const TextInputStreamPointer& stream) :
75 trimLeadingWhiteSpace_(false),
76 trimTrailingWhiteSpace_(false),
77 trimTrailingComment_(false),
82 //! Stream used by this reader.
83 TextInputStreamPointer stream_;
84 //! Whether leading whitespace should be removed.
85 bool trimLeadingWhiteSpace_;
86 //! Whether trailing whitespace should be removed.
87 bool trimTrailingWhiteSpace_;
88 //! Whether a trailing comment should be removed.
89 bool trimTrailingComment_;
90 /*! \brief Character that denotes the start of a comment on a line.
92 * Zero until TextReader::setTrimTrailingComment is called to
93 * activate such trimming with a given character. */
97 TextReader::TextReader(const std::string& filename) :
98 impl_(new Impl(TextInputStreamPointer(new TextInputFile(filename))))
102 TextReader::TextReader(TextInputStream* stream) :
103 impl_(new Impl(TextInputStreamPointer(stream, no_delete<TextInputStream>())))
107 TextReader::TextReader(const TextInputStreamPointer& stream) : impl_(new Impl(stream)) {}
109 TextReader::~TextReader() {}
111 bool TextReader::readLine(std::string* linePtr)
113 if (!impl_->stream_->readLine(linePtr))
117 auto& line = *linePtr;
118 const char whiteSpaceChars[] = " \t\r\n";
119 if (impl_->trimLeadingWhiteSpace_)
121 const size_t endPos = line.find_first_not_of(whiteSpaceChars);
122 if (endPos == std::string::npos)
128 line = line.substr(endPos, std::string::npos);
131 if (impl_->trimTrailingComment_)
133 auto commentPos = line.find(impl_->commentChar_);
134 if (commentPos != std::string::npos)
136 line.resize(commentPos);
139 if (impl_->trimTrailingWhiteSpace_)
141 const size_t endPos = line.find_last_not_of(whiteSpaceChars);
142 if (endPos == std::string::npos)
148 line.resize(endPos + 1);
154 void TextReader::setTrimLeadingWhiteSpace(bool doTrimming)
156 impl_->trimLeadingWhiteSpace_ = doTrimming;
159 void TextReader::setTrimTrailingWhiteSpace(bool doTrimming)
161 impl_->trimTrailingWhiteSpace_ = doTrimming;
164 void TextReader::setTrimTrailingComment(bool doTrimming, char commentChar)
166 impl_->trimTrailingComment_ = doTrimming;
167 if (impl_->trimTrailingComment_)
169 impl_->commentChar_ = commentChar;
173 std::string TextReader::readAll()
177 while (readLine(&line))
184 void TextReader::close()
186 impl_->stream_->close();