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# syntax.py
"""
Copyright (c) 2017 DavidBoddie <https://wiki.python.org/moin/DavidBoddie>
HomePage: https://wiki.python.org/moin/PyQt/Python%20syntax%20highlighting
Adapted by Georges Khaznadar <georgesk@debian.org> in 2022:
use the modules from PyQt5
License:
the Modified BSD License
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3)The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
"""
import sys
from QtVersion import *
from PyQt5.QtCore import QRegularExpression
def format(color, style=''):
"""Return a QTextCharFormat with the given attributes.
"""
_color = QColor()
_color.setNamedColor(color)
_format = QTextCharFormat()
_format.setForeground(_color)
if 'bold' in style:
_format.setFontWeight(QFont.Weight(700)) # QFont.Bold
if 'italic' in style:
_format.setFontItalic(True)
return _format
# Syntax styles that can be shared by all languages
STYLES = {
'keyword': format('blue'),
'operator': format('red'),
'brace': format('darkGray'),
'defclass': format('black', 'bold'),
'string': format('magenta'),
'string2': format('darkMagenta'),
'comment': format('darkGreen', 'italic'),
'self': format('black', 'italic'),
'numbers': format('brown'),
}
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):
QSyntaxHighlighter.__init__(self, 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 = (QRegularExpression("'''"), 1, STYLES['string2'])
self.tri_double = (QRegularExpression('"""'), 2, STYLES['string2'])
rules = []
# Keyword, operator, and brace rules
rules += [(r'\b%s\b' % w, 0, STYLES['keyword'])
for w in PythonHighlighter.keywords]
rules += [(r'%s' % o, 0, STYLES['operator'])
for o in PythonHighlighter.operators]
rules += [(r'%s' % b, 0, STYLES['brace'])
for b in PythonHighlighter.braces]
# All other rules
rules += [
# 'self'
(r'\bself\b', 0, STYLES['self']),
# Double-quoted string, possibly containing escape sequences
(r'"[^"\\]*(\\.[^"\\]*)*"', 0, STYLES['string']),
# Single-quoted string, possibly containing escape sequences
(r"'[^'\\]*(\\.[^'\\]*)*'", 0, STYLES['string']),
# 'def' followed by an identifier
(r'\bdef\b\s*(\w+)', 1, STYLES['defclass']),
# 'class' followed by an identifier
(r'\bclass\b\s*(\w+)', 1, STYLES['defclass']),
# From '#' until a newline
(r'#[^\n]*', 0, STYLES['comment']),
# 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']),
]
# Build a QRegularExpression for each pattern
self.rules = [(QRegularExpression(pat), index, fmt)
for (pat, index, fmt) in rules]
def highlightBlock(self, text):
"""Apply syntax highlighting to the given block of text.
"""
# 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)
# Do other syntax formatting
for expression, nth, format in self.rules:
gm = expression.globalMatch(text, 0)
while gm.hasNext():
m = gm.next()
self.setFormat(m.capturedStart(), m.capturedLength(), format)
self.setCurrentBlockState(0)
def match_multiline(self, text, delimiter, in_state, style):
"""Do highlighting of multi-line strings.
``delimiter`` should be a ``QRegularExpression`` 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.
"""
gm = delimiter.globalMatch(text, 0)
while gm.hasNext():
m = gm.next()
# each time a delimiter is matched, toggle self.currentBlockState
if self.currentBlockState() == in_state:
self.setCurrentBlockState(0)
else:
self.setCurrentBlockState(in_state)
# Return True if still inside a multi-line string, False otherwise
return self.currentBlockState() == in_state
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