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DT_With.py

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'''Nested namespace access

   The 'with' tag is used to introduce nested namespaces.

   The text enclosed in the with tag is rendered using information
   from the given variable or expression.

   For example, if the variable 'person' is bound to an object that
   has attributes 'name' and 'age', then a 'with' tag like the
   following can be used to access these attributes::

     <!--#with person-->
       <!--#var name-->,
       <!--#var age-->
     <!--#/with-->

   Eather a 'name' or an 'expr' attribute may be used to specify data.
   A 'mapping' attribute may be used to indicate that the given data
   should be treated as mapping object, rather than as an object with
   named attributes.

''' 

__rcs_id__='$Id: DT_With.py,v 1.1 2003/04/16 02:53:49 sc Exp $'
__version__='$Revision: 1.1 $'[11:-2]

from DT_Util import parse_params, name_param, InstanceDict, render_blocks, str
from DT_Util import TemplateDict
class With:
    blockContinuations=()
    name='with'
    mapping=None
    only=0
    
    def __init__(self, blocks):
        tname, args, section = blocks[0]
        args=parse_params(args, name='', expr='', mapping=1, only=1)
        name,expr=name_param(args,'with',1)
        if expr is None: expr=name
        else: expr=expr.eval
        self.__name__, self.expr = name, expr
        self.section=section.blocks
        if args.has_key('mapping') and args['mapping']: self.mapping=1
        if args.has_key('only') and args['only']: self.only=1

    def render(self, md):
        expr=self.expr
        if type(expr) is type(''): v=md[expr]
        else: v=expr(md)

        if not self.mapping:
            if type(v) is type(()) and len(v)==1: v=v[0]
            v=InstanceDict(v,md)

        if self.only:
            _md=md
            md=TemplateDict()
            if hasattr(_md, 'validate'):
                md.validate=_md.validate

        md._push(v)
        try: return render_blocks(self.section, md)
        finally: md._pop(1)

    __call__=render

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