1 /* This file is part of EdiTeX, an editor of mathematical
2 * expressions based on TeX syntax.
4 * Copyright (C) 2002-2003 Luca Padovani <lpadovan@cs.unibo.it>,
5 * 2003 Paolo Marinelli <pmarinel@cs.unibo.it>.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * For more information, please visit the project's home page
22 * http://helm.cs.unibo.it/editex/
23 * or send an email to <lpadovan@cs.unibo.it>
29 #include "TPushLexer.hh"
30 #include "APushParser.hh"
32 TPushLexer::TPushLexer(ALogger& l, APushParser& p) : APushLexer(l, p)
51 TPushLexer::transaction(char ch, State newState)
55 case '{': parser.push(TToken(TToken::BEGIN)); break;
56 case '}': parser.push(TToken(TToken::END)); break;
57 case '$': parser.push(TToken(TToken::SHIFT)); break;
58 case '&': parser.push(TToken(TToken::ALIGN)); break;
60 case '\r': parser.push(TToken(TToken::EOL, ch)); break;
61 case '^': parser.push(TToken(TToken::SUPERSCRIPT)); break;
62 case '_': parser.push(TToken(TToken::SUBSCRIPT)); break;
64 case ' ': parser.push(TToken(TToken::IGNORABLE_SPACE, ch)); break;
65 case '~': parser.push(TToken(TToken::ACTIVE, ch)); break;
66 case '%': parser.push(TToken(TToken::COMMENT)); break;
68 if (isalpha(ch)) parser.push(TToken(TToken::LETTER, ch));
69 else if (isdigit(ch)) parser.push(TToken(TToken::DIGIT, ch));
70 else parser.push(TToken(TToken::OTHER, ch));
77 TPushLexer::push(char ch)
82 if (ch == '\\') state = ESCAPE;
83 else if (ch == '#') state = PARAMETER;
85 else transaction(ch, ACCEPT);
93 else if (ch == -1) error();
96 parser.push(TToken(TToken::CONTROL, ch));
103 parser.push(TToken(TToken::CONTROL, buffer));
109 parser.push(TToken(TToken::CONTROL, buffer));
113 else if (isalpha(ch))
114 buffer.push_back(ch);
117 parser.push(TToken(TToken::CONTROL, buffer));
123 parser.push(TToken(TToken::CONTROL, buffer));
125 if (isspace(ch)) state = IGNORE_SPACE;
126 else transaction(ch, ACCEPT);
130 if (ch == '\\') state = ESCAPE;
131 else if (ch == '#') state = PARAMETER;
132 else if (isspace(ch)) ;
133 else if (ch == -1) state = ACCEPT;
134 else transaction(ch, ACCEPT);
137 if (ch == -1) error();
140 parser.push(TToken(TToken::PARAMETER, ch));
154 TPushLexer::drop(bool alt)
156 std::string restore = "";
162 restore = parser.drop(alt);
163 if (restore.length() > 0 && restore[0] == '\\')
165 buffer = std::string(restore, 1, restore.length() - 1);
166 state = (buffer.length() > 0) ? MACRO : ESCAPE;
173 if (alt) buffer.erase();
174 else buffer.erase(buffer.length() - 1, 1);
175 if (buffer.length() == 0) state = ESCAPE;
188 TPushLexer::displayCursor()
192 case ESCAPE: parser.setCursorHint("\\"); break;
193 case MACRO: parser.setCursorHint("\\" + buffer); break;
194 case PARAMETER: parser.setCursorHint("#"); break;
195 default: parser.setCursorHint(""); break;
200 TPushLexer::error() const