+/* This file is part of EdiTeX, an editor of mathematical
+ * expressions based on TeX syntax.
+ *
+ * Copyright (C) 2002-2003 Luca Padovani <lpadovan@cs.unibo.it>,
+ * 2003 Paolo Marinelli <pmarinel@cs.unibo.it>.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * For more information, please visit the project's home page
+ * http://helm.cs.unibo.it/editex/
+ * or send an email to <lpadovan@cs.unibo.it>
+ */
+
+#include <string>
+#include <cctype>
+#include <cassert>
#include "TToken.hh"
#include "TPushLexer.hh"
{
buffer.erase();
state = ACCEPT;
+
+ displayCursor();
}
void
case '^': parser.push(TToken(TToken::SUPERSCRIPT)); break;
case '_': parser.push(TToken(TToken::SUBSCRIPT)); break;
case '\t':
- case ' ': parser.push(TToken(TToken::SPACE, ch)); break;
+ case ' ': parser.push(TToken(TToken::IGNORABLE_SPACE, ch)); break;
case '~': parser.push(TToken(TToken::ACTIVE, ch)); break;
case '%': parser.push(TToken(TToken::COMMENT)); break;
default:
case ACCEPT:
if (ch == '\\') state = ESCAPE;
else if (ch == '#') state = PARAMETER;
- else if (ch == '\b') parser.push(TToken(TToken::GDELETE));
else if (ch == -1) ;
else transaction(ch, ACCEPT);
break;
buffer.push_back(ch);
state = MACRO;
}
- else if (ch == '\b')
- {
- state = ACCEPT;
- }
else if (ch == -1) error();
else
{
buffer.erase();
state = PARAMETER;
}
- else if (ch == '\b')
- {
- buffer.erase(buffer.length() - 1, 1);
- if (buffer.length() == 0) state = ESCAPE;
- }
else if (isalpha(ch))
buffer.push_back(ch);
else if (ch == -1)
if (ch == '\\') state = ESCAPE;
else if (ch == '#') state = PARAMETER;
else if (isspace(ch)) ;
- else if (ch == '\b') parser.push(TToken(TToken::GDELETE));
else if (ch == -1) state = ACCEPT;
else transaction(ch, ACCEPT);
break;
break;
}
+ displayCursor();
+
+}
+
+void
+TPushLexer::drop(bool alt)
+{
+ std::string restore = "";
+
+ switch (state)
+ {
+ case ACCEPT:
+ case IGNORE_SPACE:
+ restore = parser.drop(alt);
+ if (restore.length() > 0 && restore[0] == '\\')
+ {
+ buffer = std::string(restore, 1, restore.length() - 1);
+ state = (buffer.length() > 0) ? MACRO : ESCAPE;
+ }
+ break;
+ case ESCAPE:
+ state = ACCEPT;
+ break;
+ case MACRO:
+ if (alt) buffer.erase();
+ else buffer.erase(buffer.length() - 1, 1);
+ if (buffer.length() == 0) state = ESCAPE;
+ break;
+ case PARAMETER:
+ default:
+ assert(0);
+ break;
+ }
+
+ displayCursor();
+
+}
+
+void
+TPushLexer::displayCursor()
+{
switch (state)
{
case ESCAPE: parser.setCursorHint("\\"); break;