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########################################################################
#
# File Name: AttributeValueTemplate.py
#
#
"""
Implementation of AVTs from the XSLT Spec.
WWW: http://4suite.com/4XSLT e-mail: support@4suite.com
Copyright (c) 1999-2000 FourThought Inc, USA. All Rights Reserved.
See http://4suite.com/COPYRIGHT for license and copyright information
"""
import re, string
from xml.xslt import XsltException, Error
from xml.xpath import XPathParser, Conversions
g_braceSplitPattern = re.compile(r'([\{\}])')
class AttributeValueTemplate:
def __init__(self, source,reparse = 1):
self.source = source
if reparse:
self._plainParts = []
self._parsedParts = []
self._parse()
def _parse(self):
parser = XPathParser.XPathParser()
curr_plain_part = ''
curr_template_part = ''
in_plain_part = 1
split_form = re.split(g_braceSplitPattern, self.source)
skip_flag = 0
for i in range(len(split_form)):
segment = split_form[i]
if skip_flag:
skip_flag = skip_flag - 1
continue
if segment in ['{', '}']:
#Here we are accounting for a possible blank segment in between
try:
next = split_form[i + 1] + split_form[i + 2]
except IndexError:
next = None
if next == segment:
if in_plain_part:
curr_plain_part = curr_plain_part + segment
else:
curr_template_part = curr_template_part + segment
skip_flag = 2
elif segment == '{':
if in_plain_part:
self._plainParts.append(curr_plain_part)
in_plain_part = 0
curr_plain_part = ''
else:
raise XsltException(Error.AVT_SYNTAX)
else:
if not in_plain_part:
parsed = parser.parseExpression(curr_template_part)
self._parsedParts.append(parsed)
in_plain_part = 1
curr_template_part = ''
else:
raise XsltException(Error.AVT_SYNTAX)
else:
if in_plain_part:
curr_plain_part = curr_plain_part + segment
else:
curr_template_part = curr_template_part + segment
if in_plain_part:
self._plainParts.append(curr_plain_part)
else:
raise XsltException(Error.AVT_SYNTAX)
def evaluate(self, context):
result = ''
expansions = map(
lambda x, c=context: Conversions.StringValue(x.evaluate(c)),
self._parsedParts
)
for i in range(len(self._parsedParts)):
result = result + self._plainParts[i] + expansions[i]
result = result + self._plainParts[-1]
return result
def __repr__(self):
return self.source
def __getinitargs__(self):
return (self.source, 0)
def __getstate__(self):
return (self._plainParts,self._parsedParts)
def __setstate__(self, state):
# Nothing to do
self._plainParts,self._parsedParts = state
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