Syntax highlighting for examples.
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Gabriel Linder
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@ -10,6 +10,7 @@ from pyqtgraph.python2_3 import basestring
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from pyqtgraph.Qt import QtGui, QT_LIB
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from .utils import buildFileList, path, examples
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from .syntax import PythonHighlighter
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if QT_LIB == 'PySide':
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@ -33,6 +34,7 @@ class ExampleLoader(QtGui.QMainWindow):
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self.codeBtn = QtGui.QPushButton('Run Edited Code')
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self.codeLayout = QtGui.QGridLayout()
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self.ui.codeView.setLayout(self.codeLayout)
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self.hl = PythonHighlighter(self.ui.codeView.document())
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self.codeLayout.addItem(QtGui.QSpacerItem(100,100,QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding), 0, 0)
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self.codeLayout.addWidget(self.codeBtn, 1, 1)
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self.codeBtn.hide()
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186
examples/syntax.py
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186
examples/syntax.py
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@ -0,0 +1,186 @@
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# based on https://github.com/art1415926535/PyQt5-syntax-highlighting
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from pyqtgraph.Qt import QtCore, QtGui
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QRegExp = QtCore.QRegExp
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QFont = QtGui.QFont
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QColor = QtGui.QColor
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QTextCharFormat = QtGui.QTextCharFormat
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QSyntaxHighlighter = QtGui.QSyntaxHighlighter
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def format(color, style=''):
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"""
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Return a QTextCharFormat with the given attributes.
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"""
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_color = QColor()
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if type(color) is not str:
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_color.setRgb(color[0], color[1], color[2])
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else:
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_color.setNamedColor(color)
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_format = QTextCharFormat()
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_format.setForeground(_color)
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if 'bold' in style:
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_format.setFontWeight(QFont.Bold)
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if 'italic' in style:
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_format.setFontItalic(True)
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return _format
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# Syntax styles that can be shared by all languages
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STYLES = {
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'keyword': format('blue'),
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'operator': format('red'),
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'brace': format('darkGray'),
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'defclass': format('black', 'bold'),
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'string': format('magenta'),
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'string2': format('darkMagenta'),
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'comment': format('darkGreen', 'italic'),
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'self': format('black', 'italic'),
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'numbers': format('brown'),
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}
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class PythonHighlighter(QSyntaxHighlighter):
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"""Syntax highlighter for the Python language.
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"""
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# Python keywords
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keywords = [
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'and', 'assert', 'break', 'class', 'continue', 'def',
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'del', 'elif', 'else', 'except', 'exec', 'finally',
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'for', 'from', 'global', 'if', 'import', 'in',
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'is', 'lambda', 'not', 'or', 'pass', 'print',
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'raise', 'return', 'try', 'while', 'yield',
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'None', 'True', 'False',
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]
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# Python operators
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operators = [
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'=',
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# Comparison
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'==', '!=', '<', '<=', '>', '>=',
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# Arithmetic
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'\+', '-', '\*', '/', '//', '\%', '\*\*',
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# In-place
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'\+=', '-=', '\*=', '/=', '\%=',
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# Bitwise
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'\^', '\|', '\&', '\~', '>>', '<<',
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]
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# Python braces
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braces = [
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'\{', '\}', '\(', '\)', '\[', '\]',
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]
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def __init__(self, document):
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QSyntaxHighlighter.__init__(self, document)
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# Multi-line strings (expression, flag, style)
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# FIXME: The triple-quotes in these two lines will mess up the
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# syntax highlighting from this point onward
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self.tri_single = (QRegExp("'''"), 1, STYLES['string2'])
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self.tri_double = (QRegExp('"""'), 2, STYLES['string2'])
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rules = []
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# Keyword, operator, and brace rules
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rules += [(r'\b%s\b' % w, 0, STYLES['keyword'])
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for w in PythonHighlighter.keywords]
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rules += [(r'%s' % o, 0, STYLES['operator'])
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for o in PythonHighlighter.operators]
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rules += [(r'%s' % b, 0, STYLES['brace'])
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for b in PythonHighlighter.braces]
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# All other rules
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rules += [
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# 'self'
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(r'\bself\b', 0, STYLES['self']),
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# 'def' followed by an identifier
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(r'\bdef\b\s*(\w+)', 1, STYLES['defclass']),
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# 'class' followed by an identifier
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(r'\bclass\b\s*(\w+)', 1, STYLES['defclass']),
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# Numeric literals
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(r'\b[+-]?[0-9]+[lL]?\b', 0, STYLES['numbers']),
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(r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b', 0, STYLES['numbers']),
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(r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b', 0, STYLES['numbers']),
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# Double-quoted string, possibly containing escape sequences
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(r'"[^"\\]*(\\.[^"\\]*)*"', 0, STYLES['string']),
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# Single-quoted string, possibly containing escape sequences
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(r"'[^'\\]*(\\.[^'\\]*)*'", 0, STYLES['string']),
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# From '#' until a newline
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(r'#[^\n]*', 0, STYLES['comment']),
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]
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# Build a QRegExp for each pattern
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self.rules = [(QRegExp(pat), index, fmt)
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for (pat, index, fmt) in rules]
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def highlightBlock(self, text):
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"""Apply syntax highlighting to the given block of text.
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"""
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# Do other syntax formatting
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for expression, nth, format in self.rules:
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index = expression.indexIn(text, 0)
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while index >= 0:
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# We actually want the index of the nth match
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index = expression.pos(nth)
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length = len(expression.cap(nth))
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self.setFormat(index, length, format)
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index = expression.indexIn(text, index + length)
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self.setCurrentBlockState(0)
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# Do multi-line strings
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in_multiline = self.match_multiline(text, *self.tri_single)
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if not in_multiline:
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in_multiline = self.match_multiline(text, *self.tri_double)
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def match_multiline(self, text, delimiter, in_state, style):
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"""Do highlighting of multi-line strings. ``delimiter`` should be a
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``QRegExp`` for triple-single-quotes or triple-double-quotes, and
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``in_state`` should be a unique integer to represent the corresponding
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state changes when inside those strings. Returns True if we're still
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inside a multi-line string when this function is finished.
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"""
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# If inside triple-single quotes, start at 0
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if self.previousBlockState() == in_state:
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start = 0
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add = 0
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# Otherwise, look for the delimiter on this line
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else:
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start = delimiter.indexIn(text)
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# Move past this match
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add = delimiter.matchedLength()
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# As long as there's a delimiter match on this line...
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while start >= 0:
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# Look for the ending delimiter
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end = delimiter.indexIn(text, start + add)
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# Ending delimiter on this line?
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if end >= add:
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length = end - start + add + delimiter.matchedLength()
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self.setCurrentBlockState(0)
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# No; multi-line string
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else:
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self.setCurrentBlockState(in_state)
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length = len(text) - start + add
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# Apply formatting
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self.setFormat(start, length, style)
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# Look for the next match
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start = delimiter.indexIn(text, start + length)
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# Return True if still inside a multi-line string, False otherwise
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if self.currentBlockState() == in_state:
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return True
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else:
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return False
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