##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################

import DocumentTemplate, Common, Persistence, MethodObject, Globals, os, sys
from types import InstanceType
from logging import getLogger
from App.config import getConfiguration


LOG = getLogger('special_dtml')

class HTML(DocumentTemplate.HTML,Persistence.Persistent,):
    "Persistent HTML Document Templates"

class ClassicHTMLFile(DocumentTemplate.HTMLFile,MethodObject.Method,):
    "Persistent HTML Document Templates read from files"

    class func_code: pass
    func_code=func_code()
    func_code.co_varnames='trueself', 'self', 'REQUEST'
    func_code.co_argcount=3
    _need__name__=1
    _v_last_read=0

    def __init__(self,name,_prefix=None, **kw):
        if _prefix is None: _prefix=getConfiguration().softwarehome
        elif type(_prefix) is not type(''):
            _prefix=Common.package_home(_prefix)
        args=(self, os.path.join(_prefix, name + '.dtml'))
        if not kw.has_key('__name__'):
            kw['__name__']=os.path.split(name)[-1]
        apply(ClassicHTMLFile.inheritedAttribute('__init__'),args,kw)

    def _cook_check(self):
        if Globals.DevelopmentMode:
            __traceback_info__=self.raw
            try:    mtime=os.stat(self.raw)[8]
            except: mtime=0
            if mtime != self._v_last_read:
                self.cook()
                self._v_last_read=mtime
        elif not hasattr(self,'_v_cooked'):
            try: changed=self.__changed__()
            except: changed=1
            self.cook()
            if not changed: self.__changed__(0)

    def _setName(self, name):
        self.__name__ = name
        self._need__name__ = 0

    def __call__(self, *args, **kw):
        self._cook_check()
        return apply(HTMLFile.inheritedAttribute('__call__'),
                     (self,)+args[1:],kw)

defaultBindings = {'name_context': 'context',
                   'name_container': 'container',
                   'name_m_self': 'self',
                   'name_ns': 'caller_namespace',
                   'name_subpath': 'traverse_subpath'}

from Shared.DC.Scripts.Bindings import Bindings
from Acquisition import Explicit, aq_inner, aq_parent
from DocumentTemplate.DT_String import _marker, DTReturn, render_blocks
from DocumentTemplate.DT_Util import TemplateDict, InstanceDict
from AccessControl import getSecurityManager
from ComputedAttribute import ComputedAttribute

class DTMLFile(Bindings, Explicit, ClassicHTMLFile):
    "HTMLFile with bindings and support for __render_with_namespace__"

    func_code = None
    func_defaults = None
    _need__name__=1

    _Bindings_ns_class = TemplateDict
    def _get__roles__(self):
        imp = getattr(aq_parent(aq_inner(self)),
                      '%s__roles__' % self.__name__)
        if hasattr(imp, '__of__'):
            return imp.__of__(self)
        return imp

    __roles__ = ComputedAttribute(_get__roles__, 1)

    # By default, we want to look up names in our container.
    _Bindings_client = 'container'

    def __init__(self, name, _prefix=None, **kw):

        self.ZBindings_edit(defaultBindings)
        self._setFuncSignature()
        apply(DTMLFile.inheritedAttribute('__init__'),
              (self, name, _prefix), kw)

    def getOwner(self, info=0):
        '''
        This method is required of all objects that go into
        the security context stack.
        '''
        return None

    def _exec(self, bound_data, args, kw):
        # Cook if we haven't already
        self._cook_check()

        # Get our caller's namespace, and set up our own.
        cns = bound_data['caller_namespace']
        ns = self._Bindings_ns_class()
        push = ns._push
        ns.guarded_getattr = None
        ns.guarded_getitem = None

        req = None
        kw_bind = kw
        if cns:
            # Someone called us.
            push(cns)
            ns.level = cns.level + 1
            ns.this = getattr(cns, 'this', None)
            # Get their bindings.  Copy the request reference
            # forward, and include older keyword arguments in the
            # current 'keyword_args' binding.
            try:
                last_bound = ns[('current bindings',)]
                last_req = last_bound.get('REQUEST', None)
                if last_req:
                    bound_data['REQUEST'] = last_req
                old_kw = last_bound['keyword_args']
                if old_kw:
                    kw_bind = old_kw.copy()
                    kw_bind.update(kw)
            except: pass
        else:
            # We're first, so get the REQUEST.
            try:
                req = self.aq_acquire('REQUEST')
                if hasattr(req, 'taintWrapper'):
                    req = req.taintWrapper()
            except: pass
            bound_data['REQUEST'] = req
            ns.this = bound_data['context']
        # Bind 'keyword_args' to the complete set of keyword arguments.
        bound_data['keyword_args'] = kw_bind

        # Push globals, initialized variables, REQUEST (if any),
        # and keyword arguments onto the namespace stack

        for nsitem in (self.globals, self._vars, req, kw):
            if nsitem:
                push(nsitem)

        # Push the 'container' (default), 'context', or nothing.
        bind_to = self._Bindings_client
        if bind_to in ('container', 'client'):
            push(InstanceDict(bound_data[bind_to], ns))

        # Push the name bindings, and a reference to grab later.
        push(bound_data)
        push({('current bindings',): bound_data})

        security = getSecurityManager()
        security.addContext(self)
        try:
            value = self.ZDocumentTemplate_beforeRender(ns, _marker)
            if value is _marker:
                try: result = render_blocks(self._v_blocks, ns)
                except DTReturn, v: result = v.v
                except AttributeError:
                    if type(sys.exc_value)==InstanceType and sys.exc_value.args[0]=="_v_blocks":
                        LOG.warn("DTML file '%s' could not be read" % self.raw)
                        raise ValueError, ("DTML file error: "
                                           "Check logfile for details")
                    else:
                        raise

                self.ZDocumentTemplate_afterRender(ns, result)
                return result
            else:
                return value
        finally:
            security.removeContext(self)
            # Clear the namespace, breaking circular references.
            while len(ns): ns._pop()
    from Shared.DC.Scripts.Signature import _setFuncSignature


HTMLFile = ClassicHTMLFile
