Mercurial Repositories > eric / file comparison
comparison: eric7/E5Gui/E5GenericDiffHighlighter.py
eric7/E5Gui/E5GenericDiffHighlighter.py
- branch
- eric7
- changeset 8356
- 68ec9c3d4de5
- parent 8355
- 8a7677a63c8d
- child 8357
- a081458cc57b
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| 8355:8a7677a63c8d | 8356:68ec9c3d4de5 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2015 - 2021 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a syntax highlighter for diff outputs. | |
| 8 """ | |
| 9 | |
| 10 import re | |
| 11 | |
| 12 from PyQt6.QtGui import QSyntaxHighlighter, QTextCharFormat, QFont | |
| 13 | |
| 14 import Preferences | |
| 15 | |
| 16 | |
| 17 def TERMINAL(pattern): | |
| 18 """ | |
| 19 Function to mark a pattern as the final one to search for. | |
| 20 | |
| 21 @param pattern pattern to be marked (string) | |
| 22 @return marked pattern (string) | |
| 23 """ | |
| 24 return "__TERMINAL__:{0}".format(pattern) | |
| 25 | |
| 26 # Cache the results of re.compile for performance reasons | |
| 27 _REGEX_CACHE = {} | |
| 28 | |
| 29 | |
| 30 class E5GenericDiffHighlighter(QSyntaxHighlighter): | |
| 31 """ | |
| 32 Class implementing a generic diff highlighter. | |
| 33 """ | |
| 34 def __init__(self, doc): | |
| 35 """ | |
| 36 Constructor | |
| 37 | |
| 38 @param doc reference to the text document (QTextDocument) | |
| 39 """ | |
| 40 super().__init__(doc) | |
| 41 | |
| 42 self.regenerateRules() | |
| 43 | |
| 44 def __initColours(self): | |
| 45 """ | |
| 46 Private method to initialize the highlighter colours. | |
| 47 """ | |
| 48 self.textColor = Preferences.getDiffColour("TextColor") | |
| 49 self.addedColor = Preferences.getDiffColour("AddedColor") | |
| 50 self.removedColor = Preferences.getDiffColour("RemovedColor") | |
| 51 self.replacedColor = Preferences.getDiffColour("ReplacedColor") | |
| 52 self.contextColor = Preferences.getDiffColour("ContextColor") | |
| 53 self.headerColor = Preferences.getDiffColour("HeaderColor") | |
| 54 self.whitespaceColor = Preferences.getDiffColour("BadWhitespaceColor") | |
| 55 | |
| 56 def createRules(self, *rules): | |
| 57 """ | |
| 58 Public method to create the highlighting rules. | |
| 59 | |
| 60 @param rules set of highlighting rules (list of tuples of rule | |
| 61 pattern (string) and highlighting format (QTextCharFormat)) | |
| 62 """ | |
| 63 for _idx, ruleFormat in enumerate(rules): | |
| 64 rule, formats = ruleFormat | |
| 65 terminal = rule.startswith(TERMINAL('')) | |
| 66 if terminal: | |
| 67 rule = rule[len(TERMINAL('')):] | |
| 68 try: | |
| 69 regex = _REGEX_CACHE[rule] | |
| 70 except KeyError: | |
| 71 regex = _REGEX_CACHE[rule] = re.compile(rule) | |
| 72 self._rules.append((regex, formats, terminal)) | |
| 73 | |
| 74 def formats(self, line): | |
| 75 """ | |
| 76 Public method to determine the highlighting formats for a line of | |
| 77 text. | |
| 78 | |
| 79 @param line text line to be highlighted (string) | |
| 80 @return list of matched highlighting rules (list of tuples of match | |
| 81 object and format (QTextCharFormat)) | |
| 82 """ | |
| 83 matched = [] | |
| 84 for rx, formats, terminal in self._rules: | |
| 85 match = rx.match(line) | |
| 86 if not match: | |
| 87 continue | |
| 88 matched.append([match, formats]) | |
| 89 if terminal: | |
| 90 return matched | |
| 91 | |
| 92 return matched | |
| 93 | |
| 94 def makeFormat(self, fg=None, bg=None, bold=False): | |
| 95 """ | |
| 96 Public method to generate a format definition. | |
| 97 | |
| 98 @param fg foreground color (QColor) | |
| 99 @param bg background color (QColor) | |
| 100 @param bold flag indicating bold text (boolean) | |
| 101 @return format definiton (QTextCharFormat) | |
| 102 """ | |
| 103 font = Preferences.getEditorOtherFonts("MonospacedFont") | |
| 104 charFormat = QTextCharFormat() | |
| 105 charFormat.setFontFamilies([font.family()]) | |
| 106 charFormat.setFontPointSize(font.pointSize()) | |
| 107 | |
| 108 if fg: | |
| 109 charFormat.setForeground(fg) | |
| 110 | |
| 111 if bg: | |
| 112 charFormat.setBackground(bg) | |
| 113 | |
| 114 if bold: | |
| 115 charFormat.setFontWeight(QFont.Weight.Bold) | |
| 116 | |
| 117 return charFormat | |
| 118 | |
| 119 def highlightBlock(self, text): | |
| 120 """ | |
| 121 Public method to highlight a block of text. | |
| 122 | |
| 123 @param text text to be highlighted (string) | |
| 124 """ | |
| 125 formats = self.formats(text) | |
| 126 if not formats: | |
| 127 # nothing matched | |
| 128 self.setFormat(0, len(text), self.normalFormat) | |
| 129 return | |
| 130 | |
| 131 for match, formatStr in formats: | |
| 132 start = match.start() | |
| 133 groups = match.groups() | |
| 134 | |
| 135 # No groups in the regex, assume this is a single rule | |
| 136 # that spans the entire line | |
| 137 if not groups: | |
| 138 self.setFormat(0, len(text), formatStr) | |
| 139 continue | |
| 140 | |
| 141 # Groups exist, rule is a tuple corresponding to group | |
| 142 for groupIndex, group in enumerate(groups): | |
| 143 if not group: | |
| 144 # empty match | |
| 145 continue | |
| 146 | |
| 147 # allow None as a no-op format | |
| 148 length = len(group) | |
| 149 if formatStr[groupIndex]: | |
| 150 self.setFormat(start, start + length, | |
| 151 formatStr[groupIndex]) | |
| 152 start += length | |
| 153 | |
| 154 def regenerateRules(self): | |
| 155 """ | |
| 156 Public method to initialize or regenerate the syntax highlighter rules. | |
| 157 """ | |
| 158 self.normalFormat = self.makeFormat() | |
| 159 | |
| 160 self.__initColours() | |
| 161 | |
| 162 self._rules = [] | |
| 163 self.generateRules() | |
| 164 | |
| 165 def generateRules(self): | |
| 166 """ | |
| 167 Public method to generate the rule set. | |
| 168 | |
| 169 Note: This method must me implemented by derived syntax | |
| 170 highlighters. | |
| 171 """ | |
| 172 pass |
