Aegisub/aegisub/src/subtitle_format_srt.cpp

// Copyright (c) 2006, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
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//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
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// Aegisub Project http://www.aegisub.org/
//
// $Id$

/// @file subtitle_format_srt.cpp
/// @brief Reading/writing SubRip format subtitles (.SRT)
/// @ingroup subtitle_io
///


///////////
// Headers
#include "config.h"

#include "ass_dialogue.h"
#include "ass_file.h"
#include "subtitle_format_srt.h"
#include "text_file_reader.h"
#include "text_file_writer.h"


/// @brief Can read? 
/// @param filename 
/// @return 
///
bool SRTSubtitleFormat::CanReadFile(wxString filename) {
	return (filename.Right(4).Lower() == _T(".srt"));
}



/// @brief Can write? 
/// @param filename 
/// @return 
///
bool SRTSubtitleFormat::CanWriteFile(wxString filename) {
	return (filename.Right(4).Lower() == _T(".srt"));
}



/// @brief Get name 
/// @return 
///
wxString SRTSubtitleFormat::GetName() {
	return _T("SubRip");
}



/// @brief Get read wildcards 
/// @return 
///
wxArrayString SRTSubtitleFormat::GetReadWildcards() {
	wxArrayString formats;
	formats.Add(_T("srt"));
	return formats;
}



/// @brief Get write wildcards 
/// @return 
///
wxArrayString SRTSubtitleFormat::GetWriteWildcards() {
	return GetReadWildcards();
}



/// @brief Read file 
/// @param filename 
/// @param encoding 
///
void SRTSubtitleFormat::ReadFile(wxString filename,wxString encoding) {
	using namespace std;

	// Reader
	TextFileReader file(filename,encoding);

	// Default
	LoadDefault(false);

	// Parse file
	int linen = 1;
	int fileLine = 0;
	int mode = 0;
	int lines = 0;
	long templ;
	AssDialogue *line = NULL;
	while (file.HasMoreLines()) {
		// Reads line
		wxString curLine = file.ReadLineFromFile();
		fileLine++;

		if (mode == 0) {
			// Checks if there is anything to read
			if (curLine.IsEmpty()) continue;

			// Check if it's a line number
			if (!curLine.IsNumber()) {
				Clear();
				if (line) delete line;
				throw wxString::Format(_T("Parse error on entry %i at line %i (expecting line number). Possible malformed file."),linen,fileLine);
			}

			// Read line number
			curLine.ToLong(&templ);
			if (templ != linen) {
				linen = templ;
			}
			line = new AssDialogue();
			mode = 1;
		}

		else if (mode == 1) {
			// Read timestamps
			if (curLine.substr(13,3) != _T("-->")) {
				Clear();
				if (line) delete line;
				throw wxString::Format(_T("Parse error on entry %i at line %i (expecting timestamps). Possible malformed file."),linen,fileLine);
			}
			line->Start.ParseSRT(curLine.substr(0,12));
			line->End.ParseSRT(curLine.substr(17,12));
			mode = 2;
		}

		else if (mode == 2) {
			// Checks if it's done
			bool eof = !file.HasMoreLines();
			bool isDone = curLine.IsEmpty();

			// Append text
			if (!isDone) {
				if (line->Text != _T("")) line->Text += _T("\\N");
				line->Text += curLine;
			}

			// Done
			if (isDone || eof) {
				mode = 0;
				linen++;
				line->group = _T("[Events]");
				line->Style = _T("Default");
				line->Comment = false;
				line->ParseSRTTags();
				Line->push_back(line);
				lines++;
				line = NULL;
			}
		}
	}

	// No lines?
	if (lines == 0) {
		line = new AssDialogue();
		line->group = _T("[Events]");
		line->Style = _T("Default");
		line->Start.SetMS(0);
		line->End.SetMS(5000);
		Line->push_back(line);
	}
}



/// @brief Write file 
/// @param _filename 
/// @param encoding  
///
void SRTSubtitleFormat::WriteFile(wxString _filename,wxString encoding) {
	// Open file
	TextFileWriter file(_filename,encoding);

	// Convert to SRT
	CreateCopy();
	SortLines();
	StripComments();
	// Tags must be converted in two passes
	// First ASS style overrides are converted to SRT but linebreaks are kept
	ConvertTags(2,_T("\\N"));
	// Then we can recombine overlaps, this requires ASS style linebreaks
	RecombineOverlaps();
	MergeIdentical();
	// And finally convert linebreaks
	ConvertTags(0,_T("\r\n"));
	// Otherwise unclosed overrides might affect lines they shouldn't, see bug #809 for example

	// Write lines
	int i=1;
	using std::list;
	for (list<AssEntry*>::iterator cur=Line->begin();cur!=Line->end();cur++) {
		AssDialogue *current = dynamic_cast<AssDialogue*>(*cur);
		if (current && !current->Comment) {
			// Write line
			file.WriteLineToFile(wxString::Format(_T("%i"),i));
			file.WriteLineToFile(current->Start.GetSRTFormated() + _T(" --> ") + current->End.GetSRTFormated());
			file.WriteLineToFile(current->Text);
			file.WriteLineToFile(_T(""));

			i++;
		}
	}

	// Clean up
	ClearCopy();
}