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