mirror of
https://github.com/moses-smt/mosesdecoder.git
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176 lines
5.4 KiB
C++
176 lines
5.4 KiB
C++
#ifndef UTIL_FILE_PIECE_H
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#define UTIL_FILE_PIECE_H
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#include "util/ersatz_progress.hh"
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#include "util/exception.hh"
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#include "util/file.hh"
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#include "util/mmap.hh"
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#include "util/read_compressed.hh"
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#include "util/string_piece.hh"
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#include <cstddef>
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#include <iosfwd>
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#include <string>
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#include <cassert>
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#include <stdint.h>
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namespace util {
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class ParseNumberException : public Exception {
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public:
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explicit ParseNumberException(StringPiece value) throw();
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~ParseNumberException() throw() {}
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};
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extern const bool kSpaces[256];
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// Memory backing the returned StringPiece may vanish on the next call.
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class FilePiece {
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public:
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// 1 MB default.
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explicit FilePiece(const char *file, std::ostream *show_progress = NULL, std::size_t min_buffer = 1048576);
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// Takes ownership of fd. name is used for messages.
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explicit FilePiece(int fd, const char *name = NULL, std::ostream *show_progress = NULL, std::size_t min_buffer = 1048576);
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/* Read from an istream. Don't use this if you can avoid it. Raw fd IO is
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* much faster. But sometimes you just have an istream like Boost's HTTP
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* server and want to parse it the same way.
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* name is just used for messages and FileName().
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*/
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explicit FilePiece(std::istream &stream, const char *name = NULL, std::size_t min_buffer = 1048576);
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~FilePiece();
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char get() {
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if (position_ == position_end_) {
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Shift();
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if (at_end_) throw EndOfFileException();
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}
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return *(position_++);
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}
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// Leaves the delimiter, if any, to be returned by get(). Delimiters defined by isspace().
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StringPiece ReadDelimited(const bool *delim = kSpaces) {
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SkipSpaces(delim);
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return Consume(FindDelimiterOrEOF(delim));
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}
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/// Read word until the line or file ends.
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bool ReadWordSameLine(StringPiece &to, const bool *delim = kSpaces) {
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assert(delim[static_cast<unsigned char>('\n')]);
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// Skip non-enter spaces.
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for (; ; ++position_) {
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if (position_ == position_end_) {
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try {
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Shift();
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} catch (const util::EndOfFileException &e) { return false; }
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// And break out at end of file.
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if (position_ == position_end_) return false;
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}
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if (!delim[static_cast<unsigned char>(*position_)]) break;
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if (*position_ == '\n') return false;
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}
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// We can't be at the end of file because there's at least one character open.
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to = Consume(FindDelimiterOrEOF(delim));
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return true;
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}
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/** Read a line of text from the file.
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*
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* Unlike ReadDelimited, this includes leading spaces and consumes the
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* delimiter. It is similar to getline in that way.
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*
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* If strip_cr is true, any trailing carriate return (as would be found on
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* a file written on Windows) will be left out of the returned line.
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*
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* Throws EndOfFileException if the end of the file is encountered. If the
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* file does not end in a newline, this could mean that the last line is
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* never read.
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*/
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StringPiece ReadLine(char delim = '\n', bool strip_cr = true);
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/** Read a line of text from the file, or return false on EOF.
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*
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* This is like ReadLine, except it returns false where ReadLine throws
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* EndOfFileException. Like ReadLine it may not read the last line in the
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* file if the file does not end in a newline.
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*
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* If strip_cr is true, any trailing carriate return (as would be found on
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* a file written on Windows) will be left out of the returned line.
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*/
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bool ReadLineOrEOF(StringPiece &to, char delim = '\n', bool strip_cr = true);
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float ReadFloat();
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double ReadDouble();
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long int ReadLong();
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unsigned long int ReadULong();
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// Skip spaces defined by isspace.
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void SkipSpaces(const bool *delim = kSpaces) {
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assert(position_ <= position_end_);
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for (; ; ++position_) {
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if (position_ == position_end_) {
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Shift();
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// And break out at end of file.
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if (position_ == position_end_) return;
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}
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assert(position_ < position_end_);
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if (!delim[static_cast<unsigned char>(*position_)]) return;
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}
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}
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uint64_t Offset() const {
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return position_ - data_.begin() + mapped_offset_;
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}
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const std::string &FileName() const { return file_name_; }
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private:
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void InitializeNoRead(const char *name, std::size_t min_buffer);
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// Calls InitializeNoRead, so don't call both.
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void Initialize(const char *name, std::ostream *show_progress, std::size_t min_buffer);
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template <class T> T ReadNumber();
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StringPiece Consume(const char *to) {
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assert(to >= position_);
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StringPiece ret(position_, to - position_);
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position_ = to;
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return ret;
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}
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const char *FindDelimiterOrEOF(const bool *delim = kSpaces);
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void Shift();
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// Backends to Shift().
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void MMapShift(uint64_t desired_begin);
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void TransitionToRead();
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void ReadShift();
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const char *position_, *last_space_, *position_end_;
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scoped_fd file_;
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const uint64_t total_size_;
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const uint64_t page_;
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std::size_t default_map_size_;
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uint64_t mapped_offset_;
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// Order matters: file_ should always be destroyed after this.
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scoped_memory data_;
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bool at_end_;
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bool fallback_to_read_;
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ErsatzProgress progress_;
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std::string file_name_;
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ReadCompressed fell_back_;
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};
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} // namespace util
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#endif // UTIL_FILE_PIECE_H
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