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from qtpy.QtCore import QRegExp
from qtpy.QtGui import (QColor, QTextCharFormat, QFont, QSyntaxHighlighter)
import keyword
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.Bold)
if 'italic' in style:
_format.setFontItalic(True)
return _format
# Syntax styles that can be shared by all languages
STYLES = {
'keyword': format('blue', 'bold'),
'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'),
'inprompt': format('darkBlue', 'bold'),
'outprompt': format('darkRed', 'bold'),
}
class PromptHighlighter(object):
def __init__(self, formats=None):
self.styles = styles = dict(STYLES, **(formats or {}))
self.rules = [
# Match the prompt incase of a console
(QRegExp(r'IN[^\:]*'), 0, styles['inprompt']),
(QRegExp(r'OUT[^\:]*'), 0, styles['outprompt']),
# Numeric literals
(QRegExp(r'\b[+-]?[0-9]+\b'), 0, styles['numbers']),
]
def highlight(self, text):
for expression, nth, format in self.rules:
index = expression.indexIn(text, 0)
while index >= 0:
index = expression.pos(nth)
length = len(expression.cap(nth))
yield (index, length, format)
index = expression.indexIn(text, index + length)
class PythonHighlighter(QSyntaxHighlighter):
"""Syntax highlighter for the Python language.
"""
# Python keywords
keywords = keyword.kwlist
def __init__(self, document, formats=None):
QSyntaxHighlighter.__init__(self, document)
self.styles = styles = dict(STYLES, **(formats or {}))
# 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("'''"), 1, styles['string2'])
self.tri_double = (QRegExp('"""'), 2, styles['string2'])
rules = []
# Keyword, operator, and brace rules
rules += [(r'\b%s\b' % w, 0, styles['keyword'])
for w in PythonHighlighter.keywords]
# 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 QRegExp for each pattern
self.rules = [(QRegExp(pat), index, fmt)
for (pat, index, fmt) in rules]
def highlightBlock(self, text):
"""Apply syntax highlighting to the given block of text.
"""
# Do other syntax formatting
for expression, nth, format 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, 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)
# 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
return self.currentBlockState() == in_state
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