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https://github.com/kovidgoyal/calibre.git
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Add a rudimentary syntax highlighter for the markdown editor widget
Somebody that cares is welcome to improve it
This commit is contained in:
Kovid Goyal
parent
1b9759a4ef
commit
2108ddd6f2
@ -30,6 +30,11 @@ class MarkdownEdit(QPlainTextEdit):
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smarten_punctuation = pyqtSignal()
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smarten_punctuation = pyqtSignal()
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def __init__(self, parent=None):
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super().__init__(parent)
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from calibre.gui2.markdown_syntax_highlighter import MarkdownHighlighter
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self.highlighter = MarkdownHighlighter(self.document())
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def contextMenuEvent(self, ev):
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def contextMenuEvent(self, ev):
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m = self.createStandardContextMenu()
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m = self.createStandardContextMenu()
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m.addSeparator()
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m.addSeparator()
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345
src/calibre/gui2/markdown_syntax_highlighter.py
Normal file
345
src/calibre/gui2/markdown_syntax_highlighter.py
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@ -0,0 +1,345 @@
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#!/usr/bin/env python
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# License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
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import re
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from qt.core import (
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QApplication, QBrush, QColor, QFont, QSyntaxHighlighter, QTextCharFormat,
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QTextCursor, QTextLayout,
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)
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from calibre.gui2.palette import dark_link_color, light_link_color
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class MarkdownHighlighter(QSyntaxHighlighter):
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MARKDOWN_KEYS_REGEX = {
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'Bold' : re.compile('(?P<delim>\*\*)(?P<text>.+)(?P=delim)'),
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'uBold': re.compile('(?P<delim>__)(?P<text>[^_]{2,})(?P=delim)'),
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'Italic': re.compile('(?P<delim>\*)(?P<text>[^*]{2,})(?P=delim)'),
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'uItalic': re.compile('(?P<delim>_)(?P<text>[^_]+)(?P=delim)'),
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'Link': re.compile('(?u)(^|(?P<pre>[^!]))\[.*?\]:?[ \t]*\(?[^)]+\)?'),
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'Image': re.compile('(?u)!\[.*?\]\(.+?\)'),
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'HeaderAtx': re.compile('(?u)^\#{1,6}(.*?)\#*(\n|$)'),
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'Header': re.compile('^(.+)[ \t]*\n(=+|-+)[ \t]*\n+'),
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'CodeBlock': re.compile('^([ ]{4,}|\t).*'),
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'UnorderedList': re.compile('(?u)^\s*(\* |\+ |- )+\s*'),
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'UnorderedListStar': re.compile('^\s*(\* )+\s*'),
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'OrderedList': re.compile('(?u)^\s*(\d+\. )\s*'),
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'BlockQuote': re.compile('(?u)^\s*>+\s*'),
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'BlockQuoteCount': re.compile('^[ \t]*>[ \t]?'),
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'CodeSpan': re.compile('(?P<delim>`+).+?(?P=delim)'),
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'HR': re.compile('(?u)^(\s*(\*|-)\s*){3,}$'),
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'eHR': re.compile('(?u)^(\s*(\*|=)\s*){3,}$'),
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'Html': re.compile('<.+?>')
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}
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light_theme = {
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"bold": {"color":"#859900", "font-weight":"bold", "font-style":"normal"},
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"emphasis": {"color":"#b58900", "font-weight":"bold", "font-style":"italic"},
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"link": {"color":light_link_color.name(), "font-weight":"normal", "font-style":"normal"},
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"image": {"color":"#cb4b16", "font-weight":"normal", "font-style":"normal"},
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"header": {"color":"#2aa198", "font-weight":"bold", "font-style":"normal"},
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"unorderedlist": {"color":"red", "font-weight":"normal", "font-style":"normal"},
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"orderedlist": {"color":"red", "font-weight":"normal", "font-style":"normal"},
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"blockquote": {"color":"red", "font-weight":"normal", "font-style":"normal"},
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"codespan": {"color":"#ff5800", "font-weight":"normal", "font-style":"normal"},
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"codeblock": {"color":"#ff5800", "font-weight":"normal", "font-style":"normal"},
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"line": {"color":"#2aa198", "font-weight":"normal", "font-style":"normal"},
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"html": {"color":"#c000c0", "font-weight":"normal", "font-style":"normal"}
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}
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dark_theme = {
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"bold": {"color":"#859900", "font-weight":"bold", "font-style":"normal"},
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"emphasis": {"color":"#b58900", "font-weight":"bold", "font-style":"italic"},
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"link": {"color":dark_link_color.name(), "font-weight":"normal", "font-style":"normal"},
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"image": {"color":"#cb4b16", "font-weight":"normal", "font-style":"normal"},
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"header": {"color":"#2aa198", "font-weight":"bold", "font-style":"normal"},
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"unorderedlist": {"color":"yellow", "font-weight":"normal", "font-style":"normal"},
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"orderedlist": {"color":"yellow", "font-weight":"normal", "font-style":"normal"},
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"blockquote": {"color":"yellow", "font-weight":"normal", "font-style":"normal"},
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"codespan": {"color":"#90ee90", "font-weight":"normal", "font-style":"normal"},
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"codeblock": {"color":"#ff9900", "font-weight":"normal", "font-style":"normal"},
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"line": {"color":"#2aa198", "font-weight":"normal", "font-style":"normal"},
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"html": {"color":"#F653A6", "font-weight":"normal", "font-style":"normal"}
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}
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def __init__(self, parent):
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super().__init__(parent)
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theme = self.dark_theme if QApplication.instance().is_dark_theme else self.light_theme
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self.setTheme(theme)
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def setTheme(self, theme):
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self.theme = theme
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self.MARKDOWN_KWS_FORMAT = {}
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['bold']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['bold']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['bold']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['Bold'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['bold']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['bold']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['bold']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['uBold'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['emphasis']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['emphasis']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['emphasis']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['Italic'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['emphasis']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['emphasis']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['emphasis']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['uItalic'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['link']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['link']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['link']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['Link'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['image']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['image']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['image']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['Image'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['header']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['header']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['header']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['Header'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['header']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['header']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['header']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['HeaderAtx'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['unorderedlist']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['unorderedlist']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['unorderedlist']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['UnorderedList'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['orderedlist']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['orderedlist']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['orderedlist']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['OrderedList'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['blockquote']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['blockquote']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['blockquote']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['BlockQuote'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['codespan']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['codespan']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['codespan']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['CodeSpan'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['codeblock']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['codeblock']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['codeblock']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['CodeBlock'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['line']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['line']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['line']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['HR'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['line']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['line']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['line']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['eHR'] = format
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format = QTextCharFormat()
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format.setForeground(QBrush(QColor(theme['html']['color'])))
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format.setFontWeight(QFont.Weight.Bold if theme['html']['font-weight']=='bold' else QFont.Weight.Normal)
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format.setFontItalic(True if theme['html']['font-style']=='italic' else False)
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self.MARKDOWN_KWS_FORMAT['HTML'] = format
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self.rehighlight()
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def highlightBlock(self, text):
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self.highlightMarkdown(text,0)
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self.highlightHtml(text)
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def highlightMarkdown(self, text, strt):
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cursor = QTextCursor(self.document())
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bf = cursor.blockFormat()
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#Block quotes can contain all elements so process it first
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self.highlightBlockQuote(text, cursor, bf, strt)
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#If empty line no need to check for below elements just return
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if self.highlightEmptyLine(text, cursor, bf, strt):
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return
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#If horizontal line, look at pevious line to see if its a header, process and return
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if self.highlightHorizontalLine(text, cursor, bf, strt):
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return
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if self.highlightAtxHeader(text, cursor, bf, strt):
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return
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self.highlightList(text, cursor, bf, strt)
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self.highlightLink(text, cursor, bf, strt)
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self.highlightImage(text, cursor, bf, strt)
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self.highlightCodeSpan(text, cursor, bf, strt)
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self.highlightEmphasis(text, cursor, bf, strt)
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self.highlightBold(text, cursor, bf, strt)
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self.highlightCodeBlock(text, cursor, bf, strt)
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def highlightBlockQuote(self, text, cursor, bf, strt):
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found = False
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mo = re.search(self.MARKDOWN_KEYS_REGEX['BlockQuote'],text)
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if mo:
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self.setFormat(mo.start(), mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['BlockQuote'])
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unquote = re.sub(self.MARKDOWN_KEYS_REGEX['BlockQuoteCount'],'',text)
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spcs = re.match(self.MARKDOWN_KEYS_REGEX['BlockQuoteCount'],text)
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spcslen = 0
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if spcs:
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spcslen = len(spcs.group(0))
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self.highlightMarkdown(unquote,spcslen)
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found = True
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return found
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def highlightEmptyLine(self, text, cursor, bf, strt):
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textAscii = str(text.replace('\u2029','\n'))
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if textAscii.strip():
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return False
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else:
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return True
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def highlightHorizontalLine(self, text, cursor, bf, strt):
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found = False
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for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['HR'],text):
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prevBlock = self.currentBlock().previous()
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prevCursor = QTextCursor(prevBlock)
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prev = prevBlock.text()
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prevAscii = str(prev.replace('\u2029','\n'))
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if prevAscii.strip():
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#print "Its a header"
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prevCursor.select(QTextCursor.LineUnderCursor)
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#prevCursor.setCharFormat(self.MARKDOWN_KWS_FORMAT['Header'])
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formatRange = QTextLayout.FormatRange()
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formatRange.format = self.MARKDOWN_KWS_FORMAT['Header']
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formatRange.length = prevCursor.block().length()
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formatRange.start = 0
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prevCursor.block().layout().setAdditionalFormats([formatRange])
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self.setFormat(mo.start()+strt, mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['HR'])
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for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['eHR'],text):
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prevBlock = self.currentBlock().previous()
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prevCursor = QTextCursor(prevBlock)
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prev = prevBlock.text()
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prevAscii = str(prev.replace('\u2029','\n'))
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if prevAscii.strip():
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#print "Its a header"
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prevCursor.select(QTextCursor.LineUnderCursor)
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#prevCursor.setCharFormat(self.MARKDOWN_KWS_FORMAT['Header'])
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formatRange = QTextLayout.FormatRange()
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formatRange.format = self.MARKDOWN_KWS_FORMAT['Header']
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formatRange.length = prevCursor.block().length()
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formatRange.start = 0
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prevCursor.block().layout().setAdditionalFormats([formatRange])
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self.setFormat(mo.start()+strt, mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['HR'])
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return found
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def highlightAtxHeader(self, text, cursor, bf, strt):
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found = False
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for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['HeaderAtx'],text):
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#bf.setBackground(QBrush(QColor(7,54,65)))
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#cursor.movePosition(QTextCursor.End)
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#cursor.mergeBlockFormat(bf)
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self.setFormat(mo.start()+strt, mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['HeaderAtx'])
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found = True
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return found
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def highlightList(self, text, cursor, bf, strt):
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found = False
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for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['UnorderedList'],text):
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self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['UnorderedList'])
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found = True
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for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['OrderedList'],text):
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self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['OrderedList'])
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found = True
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return found
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|
||||||
|
def highlightLink(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['Link'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['Link'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightImage(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['Image'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['Image'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightCodeSpan(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['CodeSpan'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['CodeSpan'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightBold(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['Bold'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['Bold'])
|
||||||
|
found = True
|
||||||
|
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['uBold'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['uBold'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightEmphasis(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
unlist = re.sub(self.MARKDOWN_KEYS_REGEX['UnorderedListStar'],'',text)
|
||||||
|
spcs = re.match(self.MARKDOWN_KEYS_REGEX['UnorderedListStar'],text)
|
||||||
|
spcslen = 0
|
||||||
|
if spcs:
|
||||||
|
spcslen = len(spcs.group(0))
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['Italic'],unlist):
|
||||||
|
self.setFormat(mo.start()+strt+spcslen, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['Italic'])
|
||||||
|
found = True
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['uItalic'],text):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start()-strt, self.MARKDOWN_KWS_FORMAT['uItalic'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightCodeBlock(self, text, cursor, bf, strt):
|
||||||
|
found = False
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['CodeBlock'],text):
|
||||||
|
stripped = text.lstrip()
|
||||||
|
if stripped[0] not in ('*','-','+','>'):
|
||||||
|
self.setFormat(mo.start()+strt, mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['CodeBlock'])
|
||||||
|
found = True
|
||||||
|
return found
|
||||||
|
|
||||||
|
def highlightHtml(self, text):
|
||||||
|
for mo in re.finditer(self.MARKDOWN_KEYS_REGEX['Html'], text):
|
||||||
|
self.setFormat(mo.start(), mo.end() - mo.start(), self.MARKDOWN_KWS_FORMAT['HTML'])
|
||||||
Loading…
x
Reference in New Issue
Block a user