src/stl_text_reader.cc

   1 /*
   2     Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "stl_text_reader.h"
  21 #include "compose.hpp"
  22 #include <boost/algorithm/string.hpp>
  23 #include <boost/lexical_cast.hpp>
  24 #include <vector>
  25 #include <iostream>
  26
  27 using std::list;
  28 using std::ostream;
  29 using std::istream;
  30 using std::string;
  31 using std::vector;
  32 using std::cout;
  33 using boost::algorithm::trim;
  34 using boost::algorithm::starts_with;
  35 using boost::is_any_of;
  36 using boost::optional;
  37 using boost::lexical_cast;
  38 using namespace sub;
  39
  40 STLTextReader::STLTextReader (istream& in)
  41 {
  42         /* This reader extracts no information about where the subtitle
  43            should be on screen, so its reference is TOP_OF_SUBTITLE.
  44         */
  45         _subtitle.vertical_position.line = 0;
  46         _subtitle.vertical_position.reference = TOP_OF_SUBTITLE;
  47
  48         while (in.good ()) {
  49                 string line;
  50                 getline (in, line);
  51                 if (!in.good ()) {
  52                         return;
  53                 }
  54
  55                 trim (line);
  56
  57                 if (starts_with (line, "//")) {
  58                         continue;
  59                 }
  60
  61                 if (line.size() > 0 && line[0] == '$') {
  62                         /* $ variables */
  63                         vector<string> bits;
  64                         split (bits, line, is_any_of ("="));
  65                         if (bits.size() == 2) {
  66                                 string name = bits[0];
  67                                 trim (name);
  68                                 string value = bits[1];
  69                                 trim (value);
  70
  71                                 set (name, value);
  72                         } else {
  73                                 warn (String::compose ("Unrecognised line %1", line));
  74                         }
  75                 } else {
  76                         /* "Normal" lines */
  77                         size_t divider[2];
  78                         divider[0] = line.find_first_of (",");
  79                         if (divider[0] != string::npos) {
  80                                 divider[1] = line.find_first_of (",", divider[0] + 1);
  81                         }
  82
  83                         if (divider[0] == string::npos || divider[1] == string::npos || divider[0] <= 1 || divider[1] >= line.length() - 1) {
  84                                 warn (String::compose ("Unrecognised line %1", line));
  85                                 continue;
  86                         }
  87
  88                         string from_string = line.substr (0, divider[0] - 1);
  89                         trim (from_string);
  90                         string to_string = line.substr (divider[0] + 1, divider[1] - divider[0] - 1);
  91                         trim (to_string);
  92
  93                         optional<Time> from = time (from_string);
  94                         optional<Time> to = time (to_string);
  95
  96                         if (!from || !to) {
  97                                 warn (String::compose ("Unrecognised line %1", line));
  98                                 continue;
  99                         }
 100
 101                         _subtitle.from = from.get ();
 102                         _subtitle.to = to.get ();
 103
 104                         /* Parse ^B/^I/^U */
 105                         string text = line.substr (divider[1] + 1);
 106                         for (size_t i = 0; i < text.length(); ++i) {
 107                                 if (text[i] == '|') {
 108                                         maybe_push ();
 109                                         _subtitle.vertical_position.line = _subtitle.vertical_position.line.get() + 1;
 110                                 } else if (text[i] == '^') {
 111                                         maybe_push ();
 112                                         if ((i + 1) < text.length()) {
 113                                                 switch (text[i + 1]) {
 114                                                 case 'B':
 115                                                         _subtitle.bold = !_subtitle.bold;
 116                                                         break;
 117                                                 case 'I':
 118                                                         _subtitle.italic = !_subtitle.italic;
 119                                                         break;
 120                                                 case 'U':
 121                                                         _subtitle.underline = !_subtitle.underline;
 122                                                         break;
 123                                                 }
 124                                         }
 125                                         ++i;
 126                                 } else {
 127                                         _subtitle.text += text[i];
 128                                 }
 129                         }
 130
 131                         maybe_push ();
 132                 }
 133         }
 134 }
 135
 136 optional<Time>
 137 STLTextReader::time (string t) const
 138 {
 139         vector<string> b;
 140         split (b, t, is_any_of (":"));
 141         if (b.size() != 4) {
 142                 warn (String::compose ("Unrecognised time %1", t));
 143                 return optional<Time> ();
 144         }
 145
 146         return sub::Time::from_hmsf (lexical_cast<int> (b[0]), lexical_cast<int> (b[1]), lexical_cast<int> (b[2]), lexical_cast<int> (b[3]));
 147 }
 148
 149 void
 150 STLTextReader::set (string name, string value)
 151 {
 152         if (name == "$FontName") {
 153                 _subtitle.font = value;
 154         } else if (name == "$Bold") {
 155                 _subtitle.bold = value == "True";
 156         } else if (name == "$Italic") {
 157                 _subtitle.italic = value == "True";
 158         } else if (name == "$Underlined") {
 159                 _subtitle.underline = value == "True";
 160         } else if (name == "$FontSize") {
 161                 _subtitle.font_size.set_points (lexical_cast<int> (value));
 162         }
 163 }
 164
 165 void
 166 STLTextReader::maybe_push ()
 167 {
 168         if (!_subtitle.text.empty ()) {
 169                 _subs.push_back (_subtitle);
 170                 _subtitle.text.clear ();
 171                 _subtitle.vertical_position.line = 0;
 172         }
 173 }