Initial revision

intern/python/modules/mcf/utils/quote.py

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+'''
+Generic quoting functions (very fast),
+generalised to allow use in any number of
+situations, but normally you'll want to create
+a new function based on these patterns which
+has the default args you need.  This will
+prevent an extra function call.
+'''
+import string, regex
+# create a translator which is fully worked out...
+
+def _quote(somestring,trans,start='"',stop='"'):
+	'''
+	Return a quoted version of somestring.
+	'''
+	# would be _so_ much better if we could use the
+	# getitem, consider...
+	# return '%s%s%s'%(start,string.join(map(trans.__getitem__, somestring), ''),stop)
+	temp = list(somestring)
+	for charno in xrange(len(temp)):
+		temp[charno]= trans[temp[charno]]
+	return '%s%s%s'%(start,string.join(temp, ''),stop)
+
+def compilerex(trans):
+	'''
+	Compiles a suitable regex from a dictionary
+	translation table.  Should be used at design
+	time in most cases to improve speed.  Note:
+	is not a very intelligent algo.  You could
+	do better by creating a character-class []
+	for the single-character keys and then the
+	groups for the or-ing after it, but I've not
+	got the time at the moment.
+	'''
+	keyset = trans.keys()
+	multitrans = []
+	for x in range(len(keyset)):
+		if len(keyset[x]) != len(trans[keyset[x]]):
+			multitrans.append((keyset[x],trans[keyset[x]]))
+		if len(keyset[x])!= 1:
+			keyset[x] = '\(%s\)'%keyset[x]
+	if multitrans:
+		return 1,regex.compile(string.join(keyset,'\|'))
+
+
+def quote2(somestring,trans,rex,start='',stop=''):
+	'''
+	Should be a faster version of _quote once
+	the regex is built.  Rex should be a simple
+	or'ing of all characters requiring substitution,
+	use character ranges whereever possible (should
+	be in most cases)
+	'''
+	temp = list(somestring)
+	curpos = 0
+	try:
+		while 	rex.search(somestring,curpos) != -1:
+			pos = rex.regs[0]
+			print pos
+			replacement = list(trans[rex.group(0)])
+			temp[pos[0]:pos[1]] = replacement
+			curpos = pos[0]+len(replacement)
+	except (IndexError,regex.error):
+		pass
+	return '%s%s%s'%(start,string.join(temp, ''),stop)
+# compatability
+_quote2 = quote2
+
+def reprq(obj, qtype):
+	'''
+	Return representation of a string obj as a string with qtype 
+	quotes surrounding it.  Usable when linearising Python objects
+	to languages which have only a particular type of string. (Such
+	as VRML).  This is not a generalised nor a particularly reliable
+	solution.  You should use the _quote2 function instead.
+	'''
+	return '%s%s%s'%(qtype,string.join(string.split(string.join(string.split(obj, '\\'), '\\\\'), qtype), '\\%s'%qtype),qtype)
+