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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2008, 2009, 2010 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
from __future__ import unicode_literals
"""
Basic LilyPond syntax highlighter for QTextEdit.
"""
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QBrush, QFont, QTextCharFormat, QSyntaxHighlighter
import ly.tokenize, ly.words
_keywords = (
ly.words.keywords + ly.words.musiccommands + ly.words.markupcommands +
ly.words.markuplistcommands + ly.words.modes)
def formats():
command = QTextCharFormat()
command.setForeground(QBrush(Qt.darkBlue))
keyword = QTextCharFormat(command)
keyword.setFontWeight(QFont.Bold)
string = QTextCharFormat()
string.setForeground(QBrush(Qt.darkRed))
comment = QTextCharFormat()
comment.setFontItalic(True)
comment.setForeground(QBrush(Qt.darkGray))
delimiter = QTextCharFormat()
delimiter.setFontWeight(QFont.Bold)
special = QTextCharFormat()
special.setFontWeight(QFont.Bold)
special.setForeground(QBrush(Qt.red))
scheme = QTextCharFormat()
scheme.setForeground(QBrush(Qt.darkGreen))
return locals()
class LilyPondHighlighter(QSyntaxHighlighter):
def __init__(self, document):
QSyntaxHighlighter.__init__(self, document)
self.formats = formats()
self.state = []
def highlightBlock(self, text):
tokenizer = ly.tokenize.Tokenizer()
previous = self.previousBlockState()
if 0 <= previous < len(self.state):
tokenizer.thaw(self.state[previous])
for token in tokenizer.tokens(text):
if isinstance(token, tokenizer.Command):
format = token[1:] in _keywords and 'keyword' or 'command'
elif isinstance(token, tokenizer.String):
format = 'string'
elif token in ('{', '}', '<<', '>>', '#{', '#}', '<', '>'):
format = 'delimiter'
elif isinstance(token, tokenizer.Comment):
format = 'comment'
elif isinstance(token, tokenizer.SchemeToken):
format = 'scheme'
else:
continue
self.setFormat(token.pos, len(token), self.formats[format])
state = tokenizer.freeze()
try:
self.setCurrentBlockState(self.state.index(state))
except ValueError:
self.setCurrentBlockState(len(self.state))
self.state.append(state)
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