##############################################################################
#
# Zope Public License (ZPL) Version 1.0
# -------------------------------------
#
# Copyright (c) Digital Creations. All rights reserved.
#
# This license has been certified as Open Source(tm).
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# 3. Digital Creations requests that attribution be given to Zope
# in any manner possible. Zope includes a "Powered by Zope"
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# continues to grow. This is one way to assure that growth.
#
# 4. All advertising materials and documentation mentioning
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# "This product includes software developed by Digital Creations
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# then this clause is waived.
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# 5. Names associated with Zope or Digital Creations must not be used to
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# prior written permission from Digital Creations.
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# 6. Modified redistributions of any form whatsoever must retain
# the following acknowledgment:
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# "This product includes software developed by Digital Creations
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# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
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#
# This software consists of contributions made by Digital Creations and
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# attributions are listed in the accompanying credits file.
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##############################################################################
''' The Let tag was contributed to Zope by and is copyright, 1999
Phillip J. Eby. Permission has been granted to release the Let tag
under the Zope Public License.
Let name=value...
The 'let' tag is used to bind variables to values within a block.
The text enclosed in the let tag is rendered using information
from thegivenvariablesexpressions. import
For example::
<!--#let foofunc="foo()" my_bar=bar-->
foo() = <!--#var foofunc-->,
bar = <!--#var my_bar-->
<!--#/let-->
Notice that both 'name' and 'expr' style attributes may be used to
specify data. 'name' style attributes (e.g. my_bar=bar) will be
rendered as they are for var/with/in/etc. Quoted attributes will
be treated as Python expressions.
Variables are processed in sequence, so later assignments can
reference and/or overwrite the results of previous assignments,
as desired.
'''
from DT_Util import render_blocks,Eval,expr_globals,ParseError,regex,strip
from DT_Util import str# Probably needed due to hysterical pickles.
class Let:
blockContinuations=()
name='let'
def __init__(self, blocks):
tname, args, section = blocks[0]
self.__name__ = args
self.section = section.blocks
self.args = args = parse_let_params(args)
for i in range(len(args)):
name,expr = args[i]
if expr[:1]=='"' and expr[-1:]=='"' and len(expr) > 1:
# expr shorthand
expr=expr[1:-1]
try: args[i] = name, Eval(expr, expr_globals).eval
except SyntaxError, v:
m,(huh,l,c,src) = v
raise ParseError, (
'<strong>Expression (Python) Syntax error</strong>:'
'\n<pre>\n%s\n</pre>\n' % v[0],
'let')
def render(self, md):
d={}; md._push(d)
try:
for name,expr in self.args:
if type(expr) is type(''): d[name]=md[expr]
else: d[name]=expr(md)
return render_blocks(self.section, md)
finally: md._pop(1)
__call__ = render
def parse_let_params(text,
result=None,
tag='let',
parmre=regex.compile(
'\([\0- ]*\([^\0- =\"]+\)=\([^\0- =\"]+\)\)'),
qparmre=regex.compile(
'\([\0- ]*\([^\0- =\"]+\)="\([^"]*\)\"\)'),
**parms):
result=result or []
if parmre.match(text) >= 0:
name=parmre.group(2)
value=parmre.group(3)
l=len(parmre.group(1))
elif qparmre.match(text) >= 0:
name=qparmre.group(2)
value='"%s"' % qparmre.group(3)
l=len(qparmre.group(1))
else:
if not text or not strip(text): return result
raise ParseError, ('invalid parameter: "%s"' % text, tag)
result.append((name,value))
text=strip(text[l:])
if text: return apply(parse_let_params,(text,result,tag),parms)
else: return result
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