diff -r 501c964e20e7 -r 0059d2d09ab8 E5Gui/E5GenericDiffHighlighter.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/E5Gui/E5GenericDiffHighlighter.py Sun Feb 08 19:12:05 2015 +0100
@@ -0,0 +1,159 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2015 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a syntax highlighter for diff outputs.
+"""
+
+from __future__ import unicode_literals
+
+import re
+
+from PyQt5.QtGui import QSyntaxHighlighter, QColor, QTextCharFormat, QFont
+
+import Preferences
+
+def TERMINAL(pattern):
+ """
+ Function to mark a pattern as the final one to search for.
+
+ @param pattern pattern to be marked (string)
+ @param return marked pattern (string)
+ """
+ return "__TERMINAL__:{0}".format(pattern)
+
+# Cache the results of re.compile for performance reasons
+_REGEX_CACHE = {}
+
+class E5GenericDiffHighlighter(QSyntaxHighlighter):
+ """
+ Class implementing a generic diff highlighter.
+ """
+ def __init__(self, doc):
+ """
+ Constructor
+
+ @param doc reference to the text document (QTextDocument)
+ """
+ super(E5GenericDiffHighlighter, self).__init__(doc)
+
+ self.textColor = QColor(0, 0, 0)
+ self.addedColor = QColor(190, 237, 190)
+ self.removedColor = QColor(237, 190, 190)
+ self.replacedColor = QColor(190, 190, 237)
+ self.contextColor = QColor(255, 220, 168)
+ self.headerColor = QColor(190, 190, 237)
+
+ self.normalFormat = self.makeFormat()
+
+ self._rules = []
+ self.generateRules()
+
+ def generateRules(self):
+ """
+ Public method to generate the rule set.
+
+ Note: This method must me implemented by derived syntax
+ highlighters.
+ """
+ pass
+
+ def createRules(self, *rules):
+ """
+ Public method to create the highlighting rules.
+
+ @param rules set of highlighting rules (list of tuples of rule
+ pattern (string) and highlighting format (QTextCharFormat))
+ """
+ for idx, ruleFormat in enumerate(rules):
+ rule, formats = ruleFormat
+ terminal = rule.startswith(TERMINAL(''))
+ if terminal:
+ rule = rule[len(TERMINAL('')):]
+ try:
+ regex = _REGEX_CACHE[rule]
+ except KeyError:
+ regex = _REGEX_CACHE[rule] = re.compile(rule)
+ self._rules.append((regex, formats, terminal))
+
+ def formats(self, line):
+ """
+ Public method to determine the highlighting formats for a line of
+ text.
+
+ @param line text line to be highlighted (string)
+ @return list of matched highlighting rules (list of tuples of match
+ object and format (QTextCharFormat))
+ """
+ matched = []
+ for rx, formats, terminal in self._rules:
+ match = rx.match(line)
+ if not match:
+ continue
+ matched.append([match, formats])
+ if terminal:
+ return matched
+
+ return matched
+
+ def makeFormat(self, fg=None, bg=None, bold=False):
+ """
+ Public method to generate a format definition.
+
+ @param fg foreground color (QColor)
+ @param bg background color (QColor)
+ @param bold flag indicating bold text (boolean)
+ @return format definiton (QTextCharFormat)
+ """
+ font = Preferences.getEditorOtherFonts("MonospacedFont")
+ format = QTextCharFormat()
+ format.setFontFamily(font.family())
+ format.setFontPointSize(font.pointSize())
+
+ if fg:
+ format.setForeground(fg)
+
+ if bg:
+ format.setBackground(bg)
+
+ if bold:
+ format.setFontWeight(QFont.Bold)
+
+ return format
+
+ def highlightBlock(self, text):
+ """
+ Public method to highlight a block of text.
+
+ @param text text to be highlighted (string)
+ """
+ formats = self.formats(text)
+ if not formats:
+ # nothing matched
+ self.setFormat(0, len(text), self.normalFormat)
+ return
+
+ for match, format in formats:
+ start = match.start()
+ groups = match.groups()
+
+ # No groups in the regex, assume this is a single rule
+ # that spans the entire line
+ if not groups:
+ self.setFormat(0, len(text), format)
+ continue
+
+ # Groups exist, rule is a tuple corresponding to group
+ for groupIndex, group in enumerate(groups):
+ if not group:
+ # empty match
+ continue
+
+ # allow None as a no-op format
+ length = len(group)
+ if format[groupIndex]:
+ self.setFormat(start, start + length,
+ format[groupIndex])
+ start += length
