src/stl_text_reader.cc

   1 /*
   2     Copyright (C) 2014 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
  26 using std::list;
  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         _subtitle.vertical_position.line = 0;
  42         _subtitle.vertical_position.reference = TOP_OF_SCREEN;
  43
  44         while (in.good ()) {
  45                 string line;
  46                 getline (in, line);
  47                 if (!in.good ()) {
  48                         return;
  49                 }
  50
  51                 trim (line);
  52
  53                 if (starts_with (line, "//")) {
  54                         continue;
  55                 }
  56
  57                 if (line.size() > 0 && line[0] == '$') {
  58                         /* $ variables */
  59                         vector<string> bits;
  60                         split (bits, line, is_any_of ("="));
  61                         if (bits.size() == 2) {
  62                                 string name = bits[0];
  63                                 trim (name);
  64                                 string value = bits[1];
  65                                 trim (value);
  66
  67                                 set (name, value);
  68                         } else {
  69                                 warn (String::compose ("Unrecognised line %1", line));
  70                         }
  71                 } else {
  72                         /* "Normal" lines */
  73                         size_t divider[2];
  74                         divider[0] = line.find_first_of (",");
  75                         if (divider[0] != string::npos) {
  76                                 divider[1] = line.find_first_of (",", divider[0] + 1);
  77                         }
  78
  79                         if (divider[0] == string::npos || divider[1] == string::npos || divider[0] <= 1 || divider[1] >= line.length() - 1) {
  80                                 warn (String::compose ("Unrecognised line %1", line));
  81                                 continue;
  82                         }
  83
  84                         string from_string = line.substr (0, divider[0] - 1);
  85                         trim (from_string);
  86                         string to_string = line.substr (divider[0] + 1, divider[1] - divider[0] - 1);
  87                         trim (to_string);
  88
  89                         optional<FrameTime> from = time (from_string);
  90                         optional<FrameTime> to = time (to_string);
  91
  92                         if (!from || !to) {
  93                                 warn (String::compose ("Unrecognised line %1", line));
  94                                 continue;
  95                         }
  96
  97                         _subtitle.from.set_frame (from.get ());
  98                         _subtitle.to.set_frame (to.get ());
  99
 100                         /* Parse ^B/^I/^U */
 101                         string text = line.substr (divider[1] + 1);
 102                         for (size_t i = 0; i < text.length(); ++i) {
 103                                 if (text[i] == '|') {
 104                                         maybe_push ();
 105                                         _subtitle.vertical_position.line = _subtitle.vertical_position.line.get() + 1;
 106                                 } else if (text[i] == '^') {
 107                                         maybe_push ();
 108                                         if ((i + 1) < text.length()) {
 109                                                 switch (text[i + 1]) {
 110                                                 case 'B':
 111                                                         _subtitle.bold = !_subtitle.bold;
 112                                                         break;
 113                                                 case 'I':
 114                                                         _subtitle.italic = !_subtitle.italic;
 115                                                         break;
 116                                                 case 'U':
 117                                                         _subtitle.underline = !_subtitle.underline;
 118                                                         break;
 119                                                 }
 120                                         }
 121                                         ++i;
 122                                 } else {
 123                                         _subtitle.text += text[i];
 124                                 }
 125                         }
 126
 127                         maybe_push ();
 128                 }
 129         }
 130 }
 131
 132 optional<FrameTime>
 133 STLTextReader::time (string t) const
 134 {
 135         vector<string> b;
 136         split (b, t, is_any_of (":"));
 137         if (b.size() != 4) {
 138                 warn (String::compose ("Unrecognised time %1", t));
 139                 return optional<FrameTime> ();
 140         }
 141
 142         return FrameTime (lexical_cast<int> (b[0]), lexical_cast<int> (b[1]), lexical_cast<int> (b[2]), lexical_cast<int> (b[3]));
 143 }
 144
 145 void
 146 STLTextReader::set (string name, string value)
 147 {
 148         if (name == "$FontName") {
 149                 _subtitle.font = value;
 150         } else if (name == "$Bold") {
 151                 _subtitle.bold = value == "True";
 152         } else if (name == "$Italic") {
 153                 _subtitle.italic = value == "True";
 154         } else if (name == "$Underlined") {
 155                 _subtitle.underline = value == "True";
 156         } else if (name == "$FontSize") {
 157                 _subtitle.font_size.set_points (lexical_cast<int> (value));
 158         }
 159 }
 160
 161 void
 162 STLTextReader::maybe_push ()
 163 {
 164         if (!_subtitle.text.empty ()) {
 165                 _subs.push_back (_subtitle);
 166                 _subtitle.text.clear ();
 167                 _subtitle.vertical_position.line = 0;
 168         }
 169 }