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::ostream;
  28 using std::istream;
  29 using std::string;
  30 using std::vector;
  31 using std::cout;
  32 using boost::algorithm::trim;
  33 using boost::algorithm::starts_with;
  34 using boost::is_any_of;
  35 using boost::optional;
  36 using boost::lexical_cast;
  37 using namespace sub;
  38
  39 STLTextReader::STLTextReader (istream& in)
  40 {
  41         /* This reader extracts no information about where the subtitle
  42            should be on screen, so its reference is TOP_OF_SUBTITLE.
  43         */
  44         _subtitle.vertical_position.line = 0;
  45         _subtitle.vertical_position.reference = TOP_OF_SUBTITLE;
  46
  47         while (in.good ()) {
  48                 string line;
  49                 getline (in, line);
  50                 if (!in.good ()) {
  51                         return;
  52                 }
  53
  54                 trim (line);
  55
  56                 if (starts_with (line, "//")) {
  57                         continue;
  58                 }
  59
  60                 if (line.size() > 0 && line[0] == '$') {
  61                         /* $ variables */
  62                         vector<string> bits;
  63                         split (bits, line, is_any_of ("="));
  64                         if (bits.size() == 2) {
  65                                 string name = bits[0];
  66                                 trim (name);
  67                                 string value = bits[1];
  68                                 trim (value);
  69
  70                                 set (name, value);
  71                         } else {
  72                                 warn (String::compose ("Unrecognised line %1", line));
  73                         }
  74                 } else {
  75                         /* "Normal" lines */
  76                         size_t divider[2];
  77                         divider[0] = line.find_first_of (",");
  78                         if (divider[0] != string::npos) {
  79                                 divider[1] = line.find_first_of (",", divider[0] + 1);
  80                         }
  81
  82                         if (divider[0] == string::npos || divider[1] == string::npos || divider[0] <= 1 || divider[1] >= line.length() - 1) {
  83                                 warn (String::compose ("Unrecognised line %1", line));
  84                                 continue;
  85                         }
  86
  87                         string from_string = line.substr (0, divider[0] - 1);
  88                         trim (from_string);
  89                         string to_string = line.substr (divider[0] + 1, divider[1] - divider[0] - 1);
  90                         trim (to_string);
  91
  92                         optional<Time> from = time (from_string);
  93                         optional<Time> to = time (to_string);
  94
  95                         if (!from || !to) {
  96                                 warn (String::compose ("Unrecognised line %1", line));
  97                                 continue;
  98                         }
  99
 100                         _subtitle.from = from.get ();
 101                         _subtitle.to = to.get ();
 102
 103                         /* Parse ^B/^I/^U */
 104                         string text = line.substr (divider[1] + 1);
 105                         for (size_t i = 0; i < text.length(); ++i) {
 106                                 if (text[i] == '|') {
 107                                         maybe_push ();
 108                                         _subtitle.vertical_position.line = _subtitle.vertical_position.line.get() + 1;
 109                                 } else if (text[i] == '^') {
 110                                         maybe_push ();
 111                                         if ((i + 1) < text.length()) {
 112                                                 switch (text[i + 1]) {
 113                                                 case 'B':
 114                                                         _subtitle.bold = !_subtitle.bold;
 115                                                         break;
 116                                                 case 'I':
 117                                                         _subtitle.italic = !_subtitle.italic;
 118                                                         break;
 119                                                 case 'U':
 120                                                         _subtitle.underline = !_subtitle.underline;
 121                                                         break;
 122                                                 }
 123                                         }
 124                                         ++i;
 125                                 } else {
 126                                         _subtitle.text += text[i];
 127                                 }
 128                         }
 129
 130                         maybe_push ();
 131                 }
 132         }
 133 }
 134
 135 optional<Time>
 136 STLTextReader::time (string t) const
 137 {
 138         vector<string> b;
 139         split (b, t, is_any_of (":"));
 140         if (b.size() != 4) {
 141                 warn (String::compose ("Unrecognised time %1", t));
 142                 return optional<Time> ();
 143         }
 144
 145         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]));
 146 }
 147
 148 void
 149 STLTextReader::set (string name, string value)
 150 {
 151         if (name == "$FontName") {
 152                 _subtitle.font = value;
 153         } else if (name == "$Bold") {
 154                 _subtitle.bold = value == "True";
 155         } else if (name == "$Italic") {
 156                 _subtitle.italic = value == "True";
 157         } else if (name == "$Underlined") {
 158                 _subtitle.underline = value == "True";
 159         } else if (name == "$FontSize") {
 160                 _subtitle.font_size.set_points (lexical_cast<int> (value));
 161         }
 162 }
 163
 164 void
 165 STLTextReader::maybe_push ()
 166 {
 167         if (!_subtitle.text.empty ()) {
 168                 _subs.push_back (_subtitle);
 169                 _subtitle.text.clear ();
 170                 _subtitle.vertical_position.line = 0;
 171         }
 172 }