File indexing completed on 2024-06-23 04:28:04

 """
 SPDX-FileCopyrightText: 2017 Eliakin Costa <eliakim170@gmail.com>
 
 SPDX-License-Identifier: GPL-2.0-or-later
 """
 # syntax.py: taken from https://wiki.python.org/moin/PyQt/Python%20syntax%20highlighting
 
 
 from PyQt5.QtCore import QRegExp
 from PyQt5.QtGui import QSyntaxHighlighter
 
 
 class PythonHighlighter (QSyntaxHighlighter):
 
     """Syntax highlighter for the Python language.
     """
     # Python keywords
     keywords = [
         'and', 'assert', 'break', 'class', 'continue', 'def',
         'del', 'elif', 'else', 'except', 'exec', 'finally',
         'for', 'from', 'global', 'if', 'import', 'in',
         'is', 'lambda', 'not', 'or', 'pass', 'print',
         'raise', 'return', 'try', 'while', 'yield',
         'None', 'True', 'False',
     ]
 
     # Python operators
     operators = [
         '=',
         # Comparison
         '==', '!=', '<', '<=', '>', '>=',
         # Arithmetic
         '\+', '-', '\*', '/', '//', '\%', '\*\*',
         # In-place
         '\+=', '-=', '\*=', '/=', '\%=',
         # Bitwise
         '\^', '\|', '\&', '\~', '>>', '<<',
     ]
 
     # Python braces
     braces = [
         '\{', '\}', '\(', '\)', '\[', '\]',
     ]
 
     def __init__(self, document, syntaxStyle):
         QSyntaxHighlighter.__init__(self, document)
 
         self.syntaxStyle = syntaxStyle
         self.document = document
 
         # Multi-line strings (expression, flag, style)
         # FIXME: The triple-quotes in these two lines will mess up the
         # syntax highlighting from this point onward
         self.tri_single = (QRegExp(r"""'''(?!")"""), 1, 'string2')
         self.tri_double = (QRegExp(r'''"""(?!')'''), 2, 'string2')
 
         rules = []
 
         # Keyword, operator, and brace rules
         rules += [(r'\b%s\b' % w, 0, 'keyword')
                   for w in PythonHighlighter.keywords]
         rules += [(r'%s' % o, 0, 'operator')
                   for o in PythonHighlighter.operators]
         rules += [(r'%s' % b, 0, 'brace')
                   for b in PythonHighlighter.braces]
 
         # All other rules
         rules += [
             # 'self'
             (r'\bself\b', 0, 'self'),
 
             # Double-quoted string, possibly containing escape sequences
             (r'"[^"\\]*(\\.[^"\\]*)*"', 0, 'string'),
             # Single-quoted string, possibly containing escape sequences
             (r"'[^'\\]*(\\.[^'\\]*)*'", 0, 'string'),
 
             # 'def' followed by an identifier
             (r'\bdef\b\s*(\w+)', 1, 'defclass'),
             # 'class' followed by an identifier
             (r'\bclass\b\s*(\w+)', 1, 'defclass'),
 
             # From '#' until a newline
             (r'#[^\n]*', 0, 'comment'),
 
             # Numeric literals
             (r'\b[+-]?[0-9]+[lL]?\b', 0, 'numbers'),
             (r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b', 0, 'numbers'),
             (r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b', 0, 'numbers'),
         ]
 
         # Build a QRegExp for each pattern
         self.rules = [(QRegExp(pat), index, identifier)
                       for (pat, index, identifier) in rules]
 
     def highlightBlock(self, text):
         """Apply syntax highlighting to the given block of text."""
         # Do other syntax formatting
         for expression, nth, identifier in self.rules:
             index = expression.indexIn(text, 0)
 
             while index >= 0:
                 # We actually want the index of the nth match
                 index = expression.pos(nth)
                 length = len(expression.cap(nth))
                 self.setFormat(index, length, self.syntaxStyle[identifier])
                 index = expression.indexIn(text, index + length)
 
         self.setCurrentBlockState(0)
 
         # Do multi-line strings
         in_multiline = self.match_multiline(text, *self.tri_single)
         if not in_multiline:
             in_multiline = self.match_multiline(text, *self.tri_double)
 
     def match_multiline(self, text, delimiter, in_state, style):
         """Do highlighting of multi-line strings. ``delimiter`` should be a
         ``QRegExp`` for triple-single-quotes or triple-double-quotes, and
         ``in_state`` should be a unique integer to represent the corresponding
         state changes when inside those strings. Returns True if we're still
         inside a multi-line string when this function is finished.
         """
         # If inside triple-single quotes, start at 0
         if self.previousBlockState() == in_state:
             start = 0
             add = 0
         # Otherwise, look for the delimiter on this line
         else:
             start = delimiter.indexIn(text)
             # Move past this match
             add = delimiter.matchedLength()
 
         # As long as there's a delimiter match on this line...
         while start >= 0:
             # Look for the ending delimiter
             end = delimiter.indexIn(text, start + add)
             # Ending delimiter on this line?
             if end >= add:
                 length = end - start + add + delimiter.matchedLength()
                 self.setCurrentBlockState(0)
             # No; multi-line string
             else:
                 self.setCurrentBlockState(in_state)
                 length = len(text) - start + add
             # Apply formatting
             self.setFormat(start, length, self.syntaxStyle[style])
             # Look for the next match
             start = delimiter.indexIn(text, start + length)
 
         # Return True if still inside a multi-line string, False otherwise
         if self.currentBlockState() == in_state:
             return True
         else:
             return False
 
     def getSyntaxStyle(self):
         return self.syntaxStyle
 
     def setSyntaxStyle(self, syntaxStyle):
         self.syntaxStyle = syntaxStyle