# -*- coding: UTF-8 -*-
#
# Desc:    This file is part of the eCromedos document preparation system
# Date:    2006/03/09
# Author:  Tobias Koch (tkoch@ecromedos.net)
# License: GNU General Public License, version 2
# URL:     http://www.ecromedos.net
#

def getInstance(config):
	'''Returns a plugin instance.'''
	return Plugin(config)
#end function


class Plugin:

	def __init__(self, config):
		pass
	#end function


	def flush(self):
		pass
	#end function


	def process(self, node, format):
		'''Strip leading and trailing white-space from node content.'''

		default_nodes = [
			"title",
			"author",
			"subject",
			"date",
			"publisher",
			"dedication",
			"caption"]

		if node.name in default_nodes:
			do_strip = True
		else:
			do_strip = False
			prop = node.properties
			while prop:
				if prop.name == "strip":
					if prop.content.lower() == "yes": do_strip = True
					break
				#end if
				prop = prop.next
			#end while
		#end if

		if not do_strip: return node

		# lstrip
		if node.children:
			for child in node.children:
				if child.type == "text":
					if child.prev and child.prev.type != "text":
						if child.prev.children == None:
							break
						#end if
					#end if
					string = child.getContent()
					stripped = string.lstrip()
					if not stripped:
						child.setContent("")
					elif len(stripped) < len(string):
						child.setContent(stripped)
						break
					else:
						break
					#end if
				#end if
			#end for
		#end if

		# rstrip
		child = node.last
		while child:
			if child.type == "text":
				if child.next and child.next.type != "text":
					if child.next.children == None:
						break
					#end if
				#end if
				string = child.getContent()
				stripped = string.rstrip()
				if not stripped:
					child.setContent("")
				elif len(stripped) < len(string):
					child.setContent(stripped)
					break
				else:
					break
				#end if
			#end if
			if child.children:
				child = child.last
			else:
				child = child.prev
			#end if
		#end while

		return node
	#end function

#end class