synhigh.py

"""
Copyright 2010 Mark Holmquist and Logan May. All rights reserved.

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.

THIS SOFTWARE IS PROVIDED BY MARK HOLMQUIST AND LOGAN MAY ``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 MARK HOLMQUIST OR LOGAN
MAY OR CONTRIBUTORS 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.

The views and conclusions contained in the software and documentation are those of the
authors and should not be interpreted as representing official policies, either expressed
or implied, of Mark Holmquist and Logan May.
"""

from PyQt4 import QtGui, QtCore

def format(color, style='', bgcolor=''):
	"""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)
	if bgcolor != '':
		_color.setNamedColor(bgcolor)
		_format.setBackground(_color)

	return _format

class SyntaxHighlighter (QtGui.QSyntaxHighlighter):

	def __init__(self, fileobj):
		QtGui.QSyntaxHighlighter.__init__(self, fileobj.parent.textedit.document())

		self.styles = {
			'keyword': format('red'),
			'preproc': format('green'),
			'brace': format('darkBlue'),
			'defclass': format('black', 'bold'),
			'literal': format('magenta'),
			'comment': format('darkGreen', 'italic'),
			'wsspace': format('black', bgcolor='blue'),
			'wstab': format('black', bgcolor='red')
		}
		self.rules = []
		rules = []


# C++ ______________________________________________________________________________________________________________________

		if fileobj.language == "C++":
			keywords = ['and','and_eq','asm','auto','bitand','bitor','bool','break','case','catch','char','class','compl','const','const_cast','continue','default','delete','do','double','dynamic_cast','else','enum','explicit','export','extern','false','float','for','friend','goto','if','inline','int','long','mutable','namespace','new','not','not_eq','operator','or','or_eq','private','protected','public','register','reinterpret_cast','return','short','signed','sizeof','static','static_cast','struct','switch','template','this','throw','true','try','typedef','typeid','typename','union','unsigned','using','virtual','void','volatile','wchar_t','while','xor','xor_eq']
			rules += [(r'\b%s\b' % w, 0, self.styles['keyword']) for w in keywords]

			preprocs = ['#define','#error','#include','#line','#pragma','#undef','#if','#ifdef','#ifndef','#else','#elif','#endif']
			rules += [(r'%s' % w, 0, self.styles['preproc']) for w in preprocs]


			braces = ['\{','\}','\(','\)','\[','\]']
			rules += [(r'%s' % w, 0, self.styles['brace']) for w in braces]

			rules += [
					(r'"[^"\\]*(\\.[^"\\]*)*"', 0, self.styles['literal']), # Double-quote strings
					(r"'[^'\\]*(\\.[^'\\]*)*'", 0, self.styles['literal']), # Single-quote strings
					(r'\b\d+\b', 0, self.styles['literal']), # Numbers
					(r'\/\/[^\n]*', 0, self.styles['comment'])
			]

# PYTHON ______________________________________________________________________________________________________________________



		elif fileobj.language == "Python":
			keywords = ['and', 'del', 'for', 'is', 'raise', 'assert', 'elif', 'from', 'lambda', 'return', 'break', 'else', 'global', 'not', 'try', 'class', 'except', 'if', 'or', 'while', 'continue', 'exec', 'import', 'pass', 'yield', 'def', 'finally', 'in', 'print']
			rules += [(r'\b%s\b' % w, 0, self.styles['keyword']) for w in keywords]

			preprocs = ['import', 'from' ]
			
			rules += [(r'%s' % w, 0, self.styles['preproc']) for w in preprocs]
			
			rules += [(r'def\:', 0, self.styles['defclass'])]
	

			braces = ['\{','\}','\(','\)','\[','\]']
			rules += [(r'%s' % w, 0, self.styles['brace']) for w in braces]

			rules += [
					(r'"[^"\\]*(\\.[^"\\]*)*"', 0, self.styles['literal']), # Double-quote strings
					(r"'[^'\\]*(\\.[^'\\]*)*'", 0, self.styles['literal']), # Single-quote strings
					(r'\b\d+\b', 0, self.styles['literal']), #Numbers
					(r'\#[^\n]*', 0, self.styles['comment'])
			]


# LOLCODE ______________________________________________________________________________________________________________________



		elif fileobj.language == "LOLCODE":
			keywords = ['HAI', 'KTHXBYE', 'VISIBLE', 'GIMMEH', 'I HAS A', 'IM IN YR LOOP', 'IM OUTTA YR LOOP', 'IZ', 'BIGGER THAN', 'UP' ]
			rules += [(r'\b%s\b' % w, 0, self.styles['keyword']) for w in keywords]

			preprocs = ['CAN HAS']
			
			rules += [(r'%s' % w, 0, self.styles['preproc']) for w in preprocs]
			
			rules += [(r'def\:', 0, self.styles['defclass'])]


			braces = ['\{','\}','\(','\)','\[','\]']
			rules += [(r'%s' % w, 0, self.styles['brace']) for w in braces]

			rules += [
					(r'"[^"\\]*(\\.[^"\\]*)*"', 0, self.styles['literal']), # Double-quote strings
					(r"'[^'\\]*(\\.[^'\\]*)*'", 0, self.styles['literal']), # Single-quote strings
					(r'\b\d+\b', 0, self.styles['literal']), #Numbers
					(r'BTW[^\n]*', 0, self.styles['comment'])
			]

# PROLOG ______________________________________________________________________________________________________________________




		elif fileobj.language == "Prolog":
			keywords = ['block', 'dynamic', 'mode', 'module', 'multifile', 'meta_predicate', 'parallel', 'sequential', 'volatile' ]
			rules += [(r'\b%s\b' % w, 0, self.styles['keyword']) for w in keywords]

			# in the case of prolog i've used the preproc style to highlight capitals for variables.
			preprocs = [(r'\b[A-Z]+[a-zA-Z]*\b')]
			
			rules += [(r'%s' % w, 0, self.styles['preproc']) for w in preprocs]
			
			rules += [(r'def\:', 0, self.styles['defclass'])]


			braces = ['\{','\}','\(','\)','\[','\]']
			rules += [(r'%s' % w, 0, self.styles['brace']) for w in braces]

			rules += [
					(r'"[^"\\]*(\\.[^"\\]*)*"', 0, self.styles['literal']), # Double-quote strings
					(r"'[^'\\]*(\\.[^'\\]*)*'", 0, self.styles['literal']), # Single-quote strings
					(r'\b\d+\b', 0, self.styles['literal']), #Numbers
					(r'\%[^\n]*', 0, self.styles['comment'])
			]


# LISP _______________________________________________________________________________________________________________________



		elif fileobj.language == "Lisp":
			keywords = ['car','cdr','setq','quote','eval','append','list','cons','atom','listp','null','memberp','nil','t','defun','abs','expt','sqrt','max','min','cond']
			rules += [(r'\b%s\b' % w, 0, self.styles['keyword']) for w in keywords]

			braces = ['\(','\)']
			rules += [(r'%s' % w, 0, self.styles['brace']) for w in braces]

			rules += [
					(r'"[^"\\]*(\\.[^"\\]*)*"', 0, self.styles['literal']), # Double-quote strings
					(r"'[^'\\]*(\\.[^'\\]*)*'", 0, self.styles['literal']), # Single-quote strings
					(r'\b\d+\b', 0, self.styles['literal']), #Numbers
					(r'\;[^\n]*', 0, self.styles['comment'])
			]


# WHITESPACE ____________________________________________________________________________________________________________________



		elif fileobj.language == "Whitespace":
			# OK, we're gonna do some crazy stuff with this one. Most of it needs to be defined by hand.
			rules += [
					(r' ', 0, self.styles['wsspace']),
					(r'\t', 0, self.styles['wstab'])
			]

		self.rules = [(QtCore.QRegExp(pattern), index, formatz) for (pattern, index, formatz) in rules]

	def highlightBlock(self, 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 = expression.cap(nth).length()
				self.setFormat(index, length, format)
				index = expression.indexIn(text, index + length)
		self.setCurrentBlockState(0)