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# syntax.py
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
def format(color, style=''):
"""Return a QTextCharFormat with the given attributes.
"""
_color = QtGui.QColor()
_color.setNamedColor(color)
_format = QtGui.QTextCharFormat()
_format.setForeground(_color)
if 'bold' in style:
_format.setFontWeight(QtGui.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 (QtGui.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, 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 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']),
# 'def' followed by an identifier
(r'\bvoid\b\s*(\w+)', 1, STYLES['defclass']),
# 'class' followed by an identifier
(r'\bint\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() 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
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