--- /dev/null
+/*
+ Copyright (C) 2005 SKYRIX Software AG
+
+ This file is part of SOPE.
+
+ SOPE is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
+
+ SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with SOPE; see the file COPYING. If not, write to the
+ Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA.
+*/
+
+#include <NGObjWeb/WOxElemBuilder.h>
+
+/*
+ This builder processes elements in a way inspired by the Zope TAL. It is
+ incomplete / work in progress.
+
+ Since this builds scans the attributes of _all_ tags, it might lead to some
+ slow-down when parsing templates. But this should be negligible in the real
+ world (with WO template caching)
+
+ Note: for processing 'TAL associations', we also need a (TALES?)
+ WOAssociation subclass.
+
+ Supported attributes:
+
+ Processing order as per Zope doc:
+ 1. define
+ 2. condition
+ 3. repeat
+ 4. content OR replace
+ 5. attributes
+ 6. omit-tag
+*/
+
+@interface WOxTalElemBuilder : WOxElemBuilder
+{
+}
+
+@end
+
+#include <SaxObjC/XMLNamespaces.h>
+#include "decommon.h"
+
+@implementation WOxTalElemBuilder
+
+- (WOElement *)buildElement:(id<DOMElement>)_element templateBuilder:(id)_b {
+ // TODO: scan attributes for TAL/VAR attributes
+ id<NSObject,DOMNamedNodeMap> attrs;
+ unsigned len;
+
+ attrs = [_element attributes];
+ if ((len = [attrs length]) > 0) {
+ id<NSObject,DOMAttr> talDefine = nil; // len=6, d, define
+ id<NSObject,DOMAttr> talCondition = nil; // len=9, c, condition
+ id<NSObject,DOMAttr> talRepeat = nil; // len=6, r, repeat
+ id<NSObject,DOMAttr> talContent = nil; // len=7, c, content
+ id<NSObject,DOMAttr> talReplace = nil; // len=7, r, replace
+ id<NSObject,DOMAttr> talAttributes = nil; // len=10, a, attributes
+ id<NSObject,DOMAttr> talOmitTag = nil; // len=8, o, omit-tag
+ unsigned i;
+
+ /* collect TAL attributes */
+
+ for (i = 0; i < len; i++) {
+ id<NSObject,DOMAttr> attr;
+ NSString *ns, *aname;
+ unsigned alen;
+ unichar c0;
+ BOOL isBindNS = NO;
+
+ attr = [attrs objectAtIndex:i];
+ aname = [attr name];
+ alen = [aname length];
+
+ /* some pre-filtering based on name */
+
+ if (alen < 6 || alen > 10)
+ continue;
+ c0 = [aname characterAtIndex:0];
+ if (!(c0 == 'd' && alen == 6 /* define */) &&
+ !(c0 == 'c' && (alen == 9 || alen == 7)) &&
+ !(c0 == 'r' && (alen == 6 || alen == 7)) &&
+ !(c0 == 'a' && alen == 10 /* attributes */) &&
+ !(c0 == 'o' && alen == 8 /* omit-tag */))
+ continue;
+
+ /* check namespace */
+
+ ns = [attr namespaceURI];
+ // TODO: cache isEqualToString method?
+ if (![XMLNS_Zope_TAL isEqualToString:ns] &&
+ !(isBindNS = [XMLNS_OD_BIND isEqualToString:ns]))
+ continue;
+
+ /* check names and derive attributes */
+
+ // TODO: use var:if instead of tal:condition
+ // and var:foreach instead of tal:repeat
+ // ?
+ // TODO: the biggest issue to be solved is how to know when
+ // the element itself would be dynamic and resolve the binding
+ // => eg: <var:if> aka WOConditional and 'tal:condition'
+
+ switch (c0) {
+ case 'd':
+ if (alen == 6 && [aname isEqualToString:@"define"])
+ talDefine = attr;
+ break;
+ case 'c':
+ if (alen == 7 && [aname isEqualToString:@"content"])
+ talContent = attr;
+ else if (alen == 9 && [aname isEqualToString:@"condition"])
+ talCondition = attr;
+ break;
+ case 'r':
+ if (alen == 6 && [aname isEqualToString:@"repeat"])
+ talRepeat = attr;
+ else if (alen == 7 && [aname isEqualToString:@"replace"])
+ talReplace = attr;
+ break;
+ case 'a':
+ if (alen == 10 && [aname isEqualToString:@"attributes"])
+ talAttributes = attr;
+ break;
+ case 'o':
+ if (alen == 8 && [aname isEqualToString:@"omit-tag"])
+ talOmitTag = attr;
+ break;
+ }
+ }
+
+ /* process TAL attributes */
+ }
+
+ return [self->nextBuilder buildElement:_element templateBuilder:_b];
+}
+
+@end /* WOxTalElemBuilder */
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