1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is TransforMiiX XSLT processor code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * The MITRE Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 1999
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * Keith Visco <kvisco@ziplink.net> (Original Author)
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either the GNU General Public License Version 2 or later (the "GPL"), or
27 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 :
39 :
40 : /**
41 : * Represents a BooleanExpr, a binary expression that
42 : * performs a boolean operation between its lvalue and rvalue.
43 : **/
44 :
45 : #include "txExpr.h"
46 : #include "txIXPathContext.h"
47 :
48 : /**
49 : * Evaluates this Expr based on the given context node and processor state
50 : * @param context the context node for evaluation of this Expr
51 : * @param ps the ContextState containing the stack information needed
52 : * for evaluation
53 : * @return the result of the evaluation
54 : **/
55 : nsresult
56 0 : BooleanExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
57 : {
58 0 : *aResult = nsnull;
59 :
60 : bool lval;
61 0 : nsresult rv = leftExpr->evaluateToBool(aContext, lval);
62 0 : NS_ENSURE_SUCCESS(rv, rv);
63 :
64 : // check for early decision
65 0 : if (op == OR && lval) {
66 0 : aContext->recycler()->getBoolResult(true, aResult);
67 :
68 0 : return NS_OK;
69 : }
70 0 : if (op == AND && !lval) {
71 0 : aContext->recycler()->getBoolResult(false, aResult);
72 :
73 0 : return NS_OK;
74 : }
75 :
76 : bool rval;
77 0 : rv = rightExpr->evaluateToBool(aContext, rval);
78 0 : NS_ENSURE_SUCCESS(rv, rv);
79 :
80 : // just use rval, since we already checked lval
81 0 : aContext->recycler()->getBoolResult(rval, aResult);
82 :
83 0 : return NS_OK;
84 : } //-- evaluate
85 :
86 0 : TX_IMPL_EXPR_STUBS_2(BooleanExpr, BOOLEAN_RESULT, leftExpr, rightExpr)
87 :
88 : bool
89 0 : BooleanExpr::isSensitiveTo(ContextSensitivity aContext)
90 : {
91 0 : return leftExpr->isSensitiveTo(aContext) ||
92 0 : rightExpr->isSensitiveTo(aContext);
93 : }
94 :
95 : #ifdef TX_TO_STRING
96 : void
97 0 : BooleanExpr::toString(nsAString& str)
98 : {
99 0 : if ( leftExpr ) leftExpr->toString(str);
100 0 : else str.AppendLiteral("null");
101 :
102 0 : switch ( op ) {
103 : case OR:
104 0 : str.AppendLiteral(" or ");
105 0 : break;
106 : default:
107 0 : str.AppendLiteral(" and ");
108 0 : break;
109 : }
110 0 : if ( rightExpr ) rightExpr->toString(str);
111 0 : else str.AppendLiteral("null");
112 :
113 0 : }
114 : #endif
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