--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/xml/XPathPredicate.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2005 Frerich Raabe <raabe@kde.org>
+ * Copyright (C) 2006 Apple Computer, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef XPathPredicate_h
+#define XPathPredicate_h
+
+#if ENABLE(XPATH)
+
+#include "XPathExpressionNode.h"
+#include "XPathValue.h"
+
+namespace WebCore {
+
+    namespace XPath {
+        
+        class Number : public Expression {
+        public:
+            Number(double);
+        private:
+            virtual Value evaluate() const;
+            virtual Value::Type resultType() const { return Value::NumberValue; }
+
+            Value m_value;
+        };
+
+        class StringExpression : public Expression {
+        public:
+            StringExpression(const String&);
+        private:
+            virtual Value evaluate() const;
+            virtual Value::Type resultType() const { return Value::StringValue; }
+
+            Value m_value;
+        };
+
+        class Negative : public Expression {
+        private:
+            virtual Value evaluate() const;
+            virtual Value::Type resultType() const { return Value::NumberValue; }
+        };
+
+        class NumericOp : public Expression {
+        public:
+            enum Opcode {
+                OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
+            };
+            NumericOp(Opcode, Expression* lhs, Expression* rhs);
+        private:
+            virtual Value evaluate() const;
+            virtual Value::Type resultType() const { return Value::NumberValue; }
+
+            Opcode m_opcode;
+        };
+
+        class EqTestOp : public Expression {
+        public:
+            enum Opcode { OP_EQ, OP_NE, OP_GT, OP_LT, OP_GE, OP_LE };
+            EqTestOp(Opcode, Expression* lhs, Expression* rhs);
+            virtual Value evaluate() const;
+        private:
+            virtual Value::Type resultType() const { return Value::BooleanValue; }
+            bool compare(const Value&, const Value&) const;
+
+            Opcode m_opcode;
+        };
+
+        class LogicalOp : public Expression {
+        public:
+            enum Opcode { OP_And, OP_Or };
+            LogicalOp(Opcode, Expression* lhs, Expression* rhs);
+        private:
+            virtual Value::Type resultType() const { return Value::BooleanValue; }
+            bool shortCircuitOn() const;
+            virtual Value evaluate() const;
+
+            Opcode m_opcode;
+        };
+
+        class Union : public Expression {
+        private:
+            virtual Value evaluate() const;
+            virtual Value::Type resultType() const { return Value::NodeSetValue; }
+        };
+
+        class Predicate : public Noncopyable {
+        public:
+            Predicate(Expression*);
+            ~Predicate();
+            bool evaluate() const;
+
+            bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
+            bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
+
+        private:
+            Expression* m_expr;
+        };
+
+    }
+
+}
+
+#endif // ENABLE(XPATH)
+
+#endif // XPathPredicate_h