highlighter.py

from PyQt5 import QtCore, QtGui

def unspace(lst):
    lst2 = lst[:]
    for i in lst2:
        if ' ' in i:
            lst.append(i.replace(' ', ''))




class RickHighlighter(QtGui.QSyntaxHighlighter):
    """Syntax highlighter for the Python language.
    """
    # Rickroll keywords
    keywords = [
        'i just wanna tell u how im feeling', 'give', "py:",
        'to_string', 'to_int', 'to_float', 'length', 'take me to ur heart', 'say goodbye'
    ]
    keywords2 = [
        'and if u ask me how im feeling', 'we know the',
        "and we're gonna play it", 'gonna',
        'when i give my', 'it will be completely',
        'there aint no mistaking', 'if they ever get u down',
        'desert u', 'run around', 'together forever and never to part',
        'together forever with']

    unspace(keywords)
    unspace(keywords2)
    
    # Rickroll operators
    operators = [
        'up',
        # Comparison
        'is', 'aint', 'islessthan', 'islessthanorequalto',
        'isgreaterthan', 'isgreaterthanorequalto',
        # Arithmetics
        '\+', '-', '\*', '/', '//', '\%', '\*\*'
        ]

    
    # Braces
    braces = [
        '\{', '\}', '\(', '\)', '\[', '\]',
    ]

    def __init__(self, STYLES, parent: QtGui.QTextDocument) -> None:
        super().__init__(parent)

        # Multi-line strings (expression, flag, style)
        self.tri_single = (QtCore.QRegExp("'''"), 1, STYLES['string2'])
        self.tri_double = (QtCore.QRegExp('"""'), 2, STYLES['string2'])

        rules = []

        # Keyword, operator, and brace rules
        rules += [(r'\b%s\b' % w, 0, STYLES['keyword'])
            for w in self.keywords]
        rules += [(r'\b%s\b' % w, 0, STYLES['keyword2'])
            for w in self.keywords2]
        rules += [(r'%s' % o, 0, STYLES['operator'])
            for o in self.operators]
        rules += [(r'%s' % b, 0, STYLES['brace'])
            for b in self.braces]

        # All other rules
        rules += [
            # 'self'
            (r'\bself\b', 0, STYLES['self']),

            # 'def' followed by an identifier
            (r'\bgonna\b\s*(\w+)', 1, STYLES['defclass']),
            # 'class' followed by an identifier
            (r'\bclass\b\s*(\w+)', 1, STYLES['defclass']),

            # Numeric literals
            (r'\b[+-]?[0-9]+[lL]?\b', 0, STYLES['numbers']),
            (r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b', 0, STYLES['numbers']),
            (r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b', 0, STYLES['numbers']),

            # Double-quoted string, possibly containing escape sequences
            (r'"[^"\\]*(\\.[^"\\]*)*"', 0, STYLES['string']),
            # Single-quoted string, possibly containing escape sequences
            (r"'[^'\\]*(\\.[^'\\]*)*'", 0, STYLES['string']),

            # From '#' until a newline
            (r'#[^\n]*', 0, STYLES['comment']),
        ]

        # Build a QRegExp for each pattern
        self.rules = [(QtCore.QRegExp(pat), index, fmt)
            for (pat, index, fmt) in rules]

    def highlightBlock(self, text):
        """Apply syntax highlighting to the given block of text.
        """
        self.tripleQuoutesWithinStrings = []
        # Do other syntax formatting
        for expression, nth, format in self.rules:
            index = expression.indexIn(text, 0)
            if index >= 0:
                # if there is a string we check
                # if there are some triple quotes within the string
                # they will be ignored if they are matched again
                if expression.pattern() == r'#[^\n]*' and expression.pattern() \
                   in [r'"[^"\\]*(\\.[^"\\]*)*"', r"'[^'\\]*(\\.[^'\\]*)*'"]:
                    index += 1
                    expression.indexIn(text, index)
                    continue
                if expression.pattern() in [r'"[^"\\]*(\\.[^"\\]*)*"', r"'[^'\\]*(\\.[^'\\]*)*'"]:
                    innerIndex = self.tri_single[0].indexIn(text, index + 1)
                    if innerIndex == -1:
                        innerIndex = self.tri_double[0].indexIn(text, index + 1)

                    if innerIndex != -1:
                        tripleQuoteIndexes = range(innerIndex, innerIndex + 3)
                        self.tripleQuoutesWithinStrings.extend(tripleQuoteIndexes)

            while index >= 0:
                # skipping triple quotes within strings
                if index in self.tripleQuoutesWithinStrings:
                    index += 1
                    expression.indexIn(text, index)
                    continue

                # We actually want the index of the nth match
                index = expression.pos(nth)
                length = len(expression.cap(nth))
                self.setFormat(index, length, format)
                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)
            # skipping triple quotes within strings
            if start in self.tripleQuoutesWithinStrings:
                return False
            # 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, 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