author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:20:16 +0200 | |
changeset 36 | 0ed94ceaa377 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright 2005 Frerich Raabe <raabe@kde.org> |
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* Copyright (C) 2006 Apple Computer, Inc. |
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* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#if ENABLE(XPATH) |
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#include "XPathPredicate.h" |
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#include "Node.h" |
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#include "XPathFunctions.h" |
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#include "XPathUtil.h" |
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#include "XPathValue.h" |
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#include <math.h> |
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#include <wtf/MathExtras.h> |
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namespace WebCore { |
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namespace XPath { |
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Number::Number(double value) |
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: m_value(value) |
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{ |
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} |
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Value Number::evaluate() const |
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{ |
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return m_value; |
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} |
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StringExpression::StringExpression(const String& value) |
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: m_value(value) |
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{ |
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} |
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Value StringExpression::evaluate() const |
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{ |
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return m_value; |
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} |
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Value Negative::evaluate() const |
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{ |
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Value p(subExpr(0)->evaluate()); |
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return -p.toNumber(); |
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} |
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|
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NumericOp::NumericOp(Opcode opcode, Expression* lhs, Expression* rhs) |
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: m_opcode(opcode) |
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{ |
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addSubExpression(lhs); |
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addSubExpression(rhs); |
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} |
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|
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Value NumericOp::evaluate() const |
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{ |
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Value lhs(subExpr(0)->evaluate()); |
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Value rhs(subExpr(1)->evaluate()); |
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double leftVal = lhs.toNumber(); |
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double rightVal = rhs.toNumber(); |
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|
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switch (m_opcode) { |
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case OP_Add: |
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return leftVal + rightVal; |
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case OP_Sub: |
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return leftVal - rightVal; |
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case OP_Mul: |
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return leftVal * rightVal; |
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case OP_Div: |
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return leftVal / rightVal; |
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case OP_Mod: |
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return fmod(leftVal, rightVal); |
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} |
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ASSERT_NOT_REACHED(); |
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return 0.0; |
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} |
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|
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EqTestOp::EqTestOp(Opcode opcode, Expression* lhs, Expression* rhs) |
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: m_opcode(opcode) |
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{ |
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addSubExpression(lhs); |
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addSubExpression(rhs); |
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} |
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bool EqTestOp::compare(const Value& lhs, const Value& rhs) const |
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{ |
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110 |
if (lhs.isNodeSet()) { |
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|
111 |
const NodeSet& lhsSet = lhs.toNodeSet(); |
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|
112 |
if (rhs.isNodeSet()) { |
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diff
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|
113 |
// If both objects to be compared are node-sets, then the comparison will be true if and only if |
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|
114 |
// there is a node in the first node-set and a node in the second node-set such that the result of |
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|
115 |
// performing the comparison on the string-values of the two nodes is true. |
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|
116 |
const NodeSet& rhsSet = rhs.toNodeSet(); |
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|
117 |
for (unsigned lindex = 0; lindex < lhsSet.size(); ++lindex) |
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|
118 |
for (unsigned rindex = 0; rindex < rhsSet.size(); ++rindex) |
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|
119 |
if (compare(stringValue(lhsSet[lindex]), stringValue(rhsSet[rindex]))) |
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|
120 |
return true; |
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|
121 |
return false; |
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|
122 |
} |
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|
123 |
if (rhs.isNumber()) { |
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|
124 |
// If one object to be compared is a node-set and the other is a number, then the comparison will be true |
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|
125 |
// if and only if there is a node in the node-set such that the result of performing the comparison on the number |
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|
126 |
// to be compared and on the result of converting the string-value of that node to a number using the number function is true. |
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|
127 |
for (unsigned lindex = 0; lindex < lhsSet.size(); ++lindex) |
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|
128 |
if (compare(Value(stringValue(lhsSet[lindex])).toNumber(), rhs)) |
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|
129 |
return true; |
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|
130 |
return false; |
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|
131 |
} |
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|
132 |
if (rhs.isString()) { |
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|
133 |
// If one object to be compared is a node-set and the other is a string, then the comparison will be true |
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|
134 |
// if and only if there is a node in the node-set such that the result of performing the comparison on |
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|
135 |
// the string-value of the node and the other string is true. |
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|
136 |
for (unsigned lindex = 0; lindex < lhsSet.size(); ++lindex) |
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|
137 |
if (compare(stringValue(lhsSet[lindex]), rhs)) |
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|
138 |
return true; |
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|
139 |
return false; |
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|
140 |
} |
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|
141 |
if (rhs.isBoolean()) { |
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|
142 |
// If one object to be compared is a node-set and the other is a boolean, then the comparison will be true |
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|
143 |
// if and only if the result of performing the comparison on the boolean and on the result of converting |
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|
144 |
// the node-set to a boolean using the boolean function is true. |
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|
145 |
return compare(lhs.toBoolean(), rhs); |
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|
146 |
} |
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|
147 |
ASSERT(0); |
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|
148 |
} |
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|
149 |
if (rhs.isNodeSet()) { |
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|
150 |
const NodeSet& rhsSet = rhs.toNodeSet(); |
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|
151 |
if (lhs.isNumber()) { |
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|
152 |
for (unsigned rindex = 0; rindex < rhsSet.size(); ++rindex) |
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|
153 |
if (compare(lhs, Value(stringValue(rhsSet[rindex])).toNumber())) |
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|
154 |
return true; |
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|
155 |
return false; |
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|
156 |
} |
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|
157 |
if (lhs.isString()) { |
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|
158 |
for (unsigned rindex = 0; rindex < rhsSet.size(); ++rindex) |
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|
159 |
if (compare(lhs, stringValue(rhsSet[rindex]))) |
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|
160 |
return true; |
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|
161 |
return false; |
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|
162 |
} |
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|
163 |
if (lhs.isBoolean()) |
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|
164 |
return compare(lhs, rhs.toBoolean()); |
dd21522fd290
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|
165 |
ASSERT(0); |
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|
166 |
} |
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|
167 |
|
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|
168 |
// Neither side is a NodeSet. |
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|
169 |
switch (m_opcode) { |
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|
170 |
case OP_EQ: |
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|
171 |
case OP_NE: |
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|
172 |
bool equal; |
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|
173 |
if (lhs.isBoolean() || rhs.isBoolean()) |
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|
174 |
equal = lhs.toBoolean() == rhs.toBoolean(); |
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|
175 |
else if (lhs.isNumber() || rhs.isNumber()) |
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|
176 |
equal = lhs.toNumber() == rhs.toNumber(); |
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|
177 |
else |
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|
178 |
equal = lhs.toString() == rhs.toString(); |
dd21522fd290
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|
179 |
|
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|
180 |
if (m_opcode == OP_EQ) |
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|
181 |
return equal; |
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|
182 |
return !equal; |
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|
183 |
case OP_GT: |
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|
184 |
return lhs.toNumber() > rhs.toNumber(); |
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|
185 |
case OP_GE: |
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|
186 |
return lhs.toNumber() >= rhs.toNumber(); |
dd21522fd290
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|
187 |
case OP_LT: |
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|
188 |
return lhs.toNumber() < rhs.toNumber(); |
dd21522fd290
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|
189 |
case OP_LE: |
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|
190 |
return lhs.toNumber() <= rhs.toNumber(); |
dd21522fd290
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|
191 |
} |
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|
192 |
ASSERT(0); |
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|
193 |
return false; |
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|
194 |
} |
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|
195 |
|
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|
196 |
Value EqTestOp::evaluate() const |
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|
197 |
{ |
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|
198 |
Value lhs(subExpr(0)->evaluate()); |
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|
199 |
Value rhs(subExpr(1)->evaluate()); |
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|
200 |
|
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|
201 |
return compare(lhs, rhs); |
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|
202 |
} |
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|
203 |
|
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|
204 |
LogicalOp::LogicalOp(Opcode opcode, Expression* lhs, Expression* rhs) |
dd21522fd290
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diff
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|
205 |
: m_opcode(opcode) |
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|
206 |
{ |
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|
207 |
addSubExpression(lhs); |
dd21522fd290
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|
208 |
addSubExpression(rhs); |
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|
209 |
} |
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|
210 |
|
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|
211 |
bool LogicalOp::shortCircuitOn() const |
dd21522fd290
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|
212 |
{ |
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|
213 |
if (m_opcode == OP_And) |
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|
214 |
return false; //false and foo |
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diff
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|
215 |
|
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|
216 |
return true; //true or bar |
dd21522fd290
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|
217 |
} |
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Value LogicalOp::evaluate() const |
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{ |
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Value lhs(subExpr(0)->evaluate()); |
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// This is not only an optimization, http://www.w3.org/TR/xpath |
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// dictates that we must do short-circuit evaluation |
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bool lhsBool = lhs.toBoolean(); |
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if (lhsBool == shortCircuitOn()) |
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return lhsBool; |
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return subExpr(1)->evaluate().toBoolean(); |
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} |
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Value Union::evaluate() const |
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{ |
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Value lhsResult = subExpr(0)->evaluate(); |
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Value rhs = subExpr(1)->evaluate(); |
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if (!lhsResult.isNodeSet() || !rhs.isNodeSet()) |
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return NodeSet(); |
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NodeSet& resultSet = lhsResult.modifiableNodeSet(); |
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const NodeSet& rhsNodes = rhs.toNodeSet(); |
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HashSet<Node*> nodes; |
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for (size_t i = 0; i < resultSet.size(); ++i) |
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nodes.add(resultSet[i]); |
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for (size_t i = 0; i < rhsNodes.size(); ++i) { |
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Node* node = rhsNodes[i]; |
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if (nodes.add(node).second) |
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resultSet.append(node); |
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} |
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// It is also possible to use merge sort to avoid making the result unsorted; |
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// but this would waste the time in cases when order is not important. |
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resultSet.markSorted(false); |
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return lhsResult; |
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} |
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Predicate::Predicate(Expression* expr) |
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: m_expr(expr) |
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{ |
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} |
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Predicate::~Predicate() |
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{ |
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delete m_expr; |
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} |
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bool Predicate::evaluate() const |
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{ |
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ASSERT(m_expr != 0); |
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Value result(m_expr->evaluate()); |
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// foo[3] means foo[position()=3] |
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if (result.isNumber()) |
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return EqTestOp(EqTestOp::OP_EQ, createFunction("position"), new Number(result.toNumber())).evaluate().toBoolean(); |
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return result.toBoolean(); |
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} |
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} |
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} |
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#endif // ENABLE(XPATH) |