mirror of
https://github.com/mozilla/gecko-dev.git
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d376f9f82e
do_GetAtom() is currently just a synonym for NS_NewAtom(). --HG-- extra : rebase_source : f4409784f931616cbc300591e6b843d30805c273
1005 lines
26 KiB
C++
1005 lines
26 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef TRANSFRMX_EXPR_H
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#define TRANSFRMX_EXPR_H
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#include "mozilla/Attributes.h"
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#include "nsAutoPtr.h"
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#include "txExprResult.h"
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#include "txCore.h"
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#include "nsString.h"
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#include "txOwningArray.h"
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#include "nsIAtom.h"
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#ifdef DEBUG
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#define TX_TO_STRING
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#endif
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/*
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XPath class definitions.
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Much of this code was ported from XSL:P.
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*/
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class nsIAtom;
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class txIMatchContext;
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class txIEvalContext;
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class txNodeSet;
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class txXPathNode;
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/**
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* A Base Class for all XSL Expressions
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**/
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class Expr
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{
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public:
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Expr()
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{
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MOZ_COUNT_CTOR(Expr);
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}
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virtual ~Expr()
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{
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MOZ_COUNT_DTOR(Expr);
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}
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/**
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* Evaluates this Expr based on the given context node and processor state
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* @param context the context node for evaluation of this Expr
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* @param ps the ContextState containing the stack information needed
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* for evaluation
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* @return the result of the evaluation
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**/
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virtual nsresult evaluate(txIEvalContext* aContext,
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txAExprResult** aResult) = 0;
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/**
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* Returns the type of this expression.
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*/
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enum ExprType {
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LOCATIONSTEP_EXPR,
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PATH_EXPR,
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UNION_EXPR,
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LITERAL_EXPR,
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OTHER_EXPR
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};
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virtual ExprType getType()
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{
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return OTHER_EXPR;
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}
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/**
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* Returns the type or types of results this Expr return.
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*/
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typedef uint16_t ResultType;
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enum {
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NODESET_RESULT = 0x01,
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BOOLEAN_RESULT = 0x02,
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NUMBER_RESULT = 0x04,
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STRING_RESULT = 0x08,
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RTF_RESULT = 0x10,
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ANY_RESULT = 0xFFFF
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};
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virtual ResultType getReturnType() = 0;
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bool canReturnType(ResultType aType)
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{
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return (getReturnType() & aType) != 0;
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}
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typedef uint16_t ContextSensitivity;
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enum {
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NO_CONTEXT = 0x00,
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NODE_CONTEXT = 0x01,
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POSITION_CONTEXT = 0x02,
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SIZE_CONTEXT = 0x04,
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NODESET_CONTEXT = POSITION_CONTEXT | SIZE_CONTEXT,
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VARIABLES_CONTEXT = 0x08,
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PRIVATE_CONTEXT = 0x10,
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ANY_CONTEXT = 0xFFFF
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};
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/**
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* Returns true if this expression is sensitive to *any* of
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* the requested contexts in aContexts.
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*/
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virtual bool isSensitiveTo(ContextSensitivity aContexts) = 0;
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/**
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* Returns sub-expression at given position
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*/
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virtual Expr* getSubExprAt(uint32_t aPos) = 0;
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/**
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* Replace sub-expression at given position. Does not delete the old
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* expression, that is the responsibility of the caller.
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*/
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virtual void setSubExprAt(uint32_t aPos, Expr* aExpr) = 0;
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virtual nsresult evaluateToBool(txIEvalContext* aContext,
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bool& aResult);
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virtual nsresult evaluateToString(txIEvalContext* aContext,
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nsString& aResult);
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#ifdef TX_TO_STRING
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/**
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* Returns the String representation of this Expr.
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* @param dest the String to use when creating the String
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* representation. The String representation will be appended to
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* any data in the destination String, to allow cascading calls to
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* other #toString() methods for Expressions.
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* @return the String representation of this Expr.
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**/
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virtual void toString(nsAString& str) = 0;
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#endif
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}; //-- Expr
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#ifdef TX_TO_STRING
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#define TX_DECL_TOSTRING \
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void toString(nsAString& aDest) override;
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#define TX_DECL_GETNAMEATOM \
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nsresult getNameAtom(nsIAtom** aAtom) override;
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#else
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#define TX_DECL_TOSTRING
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#define TX_DECL_GETNAMEATOM
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#endif
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#define TX_DECL_EXPR_BASE \
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nsresult evaluate(txIEvalContext* aContext, txAExprResult** aResult) override; \
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ResultType getReturnType() override; \
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bool isSensitiveTo(ContextSensitivity aContexts) override;
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#define TX_DECL_EXPR \
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TX_DECL_EXPR_BASE \
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TX_DECL_TOSTRING \
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Expr* getSubExprAt(uint32_t aPos) override; \
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void setSubExprAt(uint32_t aPos, Expr* aExpr) override;
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#define TX_DECL_OPTIMIZABLE_EXPR \
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TX_DECL_EXPR \
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ExprType getType() override;
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#define TX_DECL_FUNCTION \
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TX_DECL_GETNAMEATOM \
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TX_DECL_EXPR_BASE
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#define TX_IMPL_EXPR_STUBS_BASE(_class, _ReturnType) \
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Expr::ResultType \
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_class::getReturnType() \
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{ \
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return _ReturnType; \
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}
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#define TX_IMPL_EXPR_STUBS_0(_class, _ReturnType) \
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TX_IMPL_EXPR_STUBS_BASE(_class, _ReturnType) \
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Expr* \
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_class::getSubExprAt(uint32_t aPos) \
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{ \
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return nullptr; \
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} \
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void \
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_class::setSubExprAt(uint32_t aPos, Expr* aExpr) \
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{ \
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NS_NOTREACHED("setting bad subexpression index"); \
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}
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#define TX_IMPL_EXPR_STUBS_1(_class, _ReturnType, _Expr1) \
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TX_IMPL_EXPR_STUBS_BASE(_class, _ReturnType) \
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Expr* \
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_class::getSubExprAt(uint32_t aPos) \
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{ \
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if (aPos == 0) { \
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return _Expr1; \
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} \
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return nullptr; \
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} \
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void \
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_class::setSubExprAt(uint32_t aPos, Expr* aExpr) \
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{ \
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NS_ASSERTION(aPos < 1, "setting bad subexpression index");\
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_Expr1.forget(); \
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_Expr1 = aExpr; \
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}
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#define TX_IMPL_EXPR_STUBS_2(_class, _ReturnType, _Expr1, _Expr2) \
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TX_IMPL_EXPR_STUBS_BASE(_class, _ReturnType) \
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Expr* \
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_class::getSubExprAt(uint32_t aPos) \
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{ \
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switch(aPos) { \
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case 0: \
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return _Expr1; \
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case 1: \
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return _Expr2; \
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default: \
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break; \
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} \
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return nullptr; \
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} \
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void \
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_class::setSubExprAt(uint32_t aPos, Expr* aExpr) \
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{ \
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NS_ASSERTION(aPos < 2, "setting bad subexpression index");\
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if (aPos == 0) { \
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_Expr1.forget(); \
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_Expr1 = aExpr; \
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} \
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else { \
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_Expr2.forget(); \
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_Expr2 = aExpr; \
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} \
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}
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#define TX_IMPL_EXPR_STUBS_LIST(_class, _ReturnType, _ExprList) \
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TX_IMPL_EXPR_STUBS_BASE(_class, _ReturnType) \
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Expr* \
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_class::getSubExprAt(uint32_t aPos) \
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{ \
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return _ExprList.SafeElementAt(aPos); \
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} \
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void \
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_class::setSubExprAt(uint32_t aPos, Expr* aExpr) \
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{ \
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NS_ASSERTION(aPos < _ExprList.Length(), \
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"setting bad subexpression index"); \
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_ExprList[aPos] = aExpr; \
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}
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/**
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* This class represents a FunctionCall as defined by the XPath 1.0
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* Recommendation.
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**/
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class FunctionCall : public Expr
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{
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public:
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/**
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* Adds the given parameter to this FunctionCall's parameter list.
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* The ownership of the given Expr is passed over to the FunctionCall,
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* even on failure.
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* @param aExpr the Expr to add to this FunctionCall's parameter list
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* @return nsresult indicating out of memory
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*/
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nsresult addParam(Expr* aExpr)
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{
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return mParams.AppendElement(aExpr) ?
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NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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/**
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* Check if the number of parameters falls within a range.
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*
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* @param aParamCountMin minimum number of required parameters.
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* @param aParamCountMax maximum number of parameters. If aParamCountMax
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* is negative the maximum number is not checked.
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* @return boolean representing whether the number of parameters falls
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* within the expected range or not.
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*
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* XXX txIEvalContext should be txIParseContest, bug 143291
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*/
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virtual bool requireParams(int32_t aParamCountMin,
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int32_t aParamCountMax,
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txIEvalContext* aContext);
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TX_DECL_TOSTRING
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Expr* getSubExprAt(uint32_t aPos) override;
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void setSubExprAt(uint32_t aPos, Expr* aExpr) override;
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protected:
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txOwningArray<Expr> mParams;
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/*
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* Evaluates the given Expression and converts its result to a number.
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*/
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static nsresult evaluateToNumber(Expr* aExpr, txIEvalContext* aContext,
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double* aResult);
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/*
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* Evaluates the given Expression and converts its result to a NodeSet.
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* If the result is not a NodeSet an error is returned.
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*/
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static nsresult evaluateToNodeSet(Expr* aExpr, txIEvalContext* aContext,
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txNodeSet** aResult);
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/**
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* Returns true if any argument is sensitive to the given context.
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*/
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bool argsSensitiveTo(ContextSensitivity aContexts);
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#ifdef TX_TO_STRING
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/*
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* Returns the name of the function as an atom.
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*/
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virtual nsresult getNameAtom(nsIAtom** aAtom) = 0;
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#endif
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};
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class txCoreFunctionCall : public FunctionCall
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{
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public:
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// This must be ordered in the same order as descriptTable in
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// txCoreFunctionCall.cpp. If you change one, change the other.
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enum eType {
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COUNT = 0, // count()
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ID, // id()
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LAST, // last()
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LOCAL_NAME, // local-name()
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NAMESPACE_URI, // namespace-uri()
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NAME, // name()
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POSITION, // position()
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CONCAT, // concat()
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CONTAINS, // contains()
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NORMALIZE_SPACE, // normalize-space()
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STARTS_WITH, // starts-with()
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STRING, // string()
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STRING_LENGTH, // string-length()
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SUBSTRING, // substring()
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SUBSTRING_AFTER, // substring-after()
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SUBSTRING_BEFORE, // substring-before()
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TRANSLATE, // translate()
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NUMBER, // number()
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ROUND, // round()
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FLOOR, // floor()
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CEILING, // ceiling()
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SUM, // sum()
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BOOLEAN, // boolean()
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_FALSE, // false()
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LANG, // lang()
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_NOT, // not()
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_TRUE // true()
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};
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/*
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* Creates a txCoreFunctionCall of the given type
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*/
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explicit txCoreFunctionCall(eType aType) : mType(aType)
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{
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}
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TX_DECL_FUNCTION
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static bool getTypeFromAtom(nsIAtom* aName, eType& aType);
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private:
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eType mType;
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};
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/*
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* This class represents a NodeTest as defined by the XPath spec
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*/
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class txNodeTest
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{
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public:
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txNodeTest()
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{
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MOZ_COUNT_CTOR(txNodeTest);
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}
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virtual ~txNodeTest()
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{
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MOZ_COUNT_DTOR(txNodeTest);
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}
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/*
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* Virtual methods
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* pretty much a txPattern, but not supposed to be used
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* standalone. The NodeTest node() is different to the
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* Pattern "node()" (document node isn't matched)
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*/
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virtual bool matches(const txXPathNode& aNode,
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txIMatchContext* aContext) = 0;
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virtual double getDefaultPriority() = 0;
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/**
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* Returns the type of this nodetest.
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*/
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enum NodeTestType {
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NAME_TEST,
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NODETYPE_TEST,
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OTHER_TEST
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};
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virtual NodeTestType getType()
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{
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return OTHER_TEST;
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}
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/**
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* Returns true if this expression is sensitive to *any* of
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* the requested flags.
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*/
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virtual bool isSensitiveTo(Expr::ContextSensitivity aContext) = 0;
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#ifdef TX_TO_STRING
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virtual void toString(nsAString& aDest) = 0;
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#endif
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};
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#define TX_DECL_NODE_TEST \
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TX_DECL_TOSTRING \
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bool matches(const txXPathNode& aNode, txIMatchContext* aContext) override; \
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double getDefaultPriority() override; \
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bool isSensitiveTo(Expr::ContextSensitivity aContext) override;
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/*
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* This class represents a NameTest as defined by the XPath spec
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*/
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class txNameTest : public txNodeTest
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{
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public:
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/*
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* Creates a new txNameTest with the given type and the given
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* principal node type
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*/
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txNameTest(nsIAtom* aPrefix, nsIAtom* aLocalName, int32_t aNSID,
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uint16_t aNodeType);
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NodeTestType getType() override;
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TX_DECL_NODE_TEST
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nsCOMPtr<nsIAtom> mPrefix;
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nsCOMPtr<nsIAtom> mLocalName;
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int32_t mNamespace;
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private:
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uint16_t mNodeType;
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};
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/*
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* This class represents a NodeType as defined by the XPath spec
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*/
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class txNodeTypeTest : public txNodeTest
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{
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public:
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enum NodeType {
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COMMENT_TYPE,
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TEXT_TYPE,
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PI_TYPE,
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NODE_TYPE
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};
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/*
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* Creates a new txNodeTypeTest of the given type
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*/
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explicit txNodeTypeTest(NodeType aNodeType)
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: mNodeType(aNodeType)
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{
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}
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/*
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* Sets the name of the node to match. Only availible for pi nodes
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*/
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void setNodeName(const nsAString& aName)
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{
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mNodeName = NS_Atomize(aName);
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}
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NodeType getNodeTestType()
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{
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return mNodeType;
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}
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NodeTestType getType() override;
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TX_DECL_NODE_TEST
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private:
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NodeType mNodeType;
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nsCOMPtr<nsIAtom> mNodeName;
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};
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/**
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* Class representing a nodetest combined with a predicate. May only be used
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* if the predicate is not sensitive to the context-nodelist.
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*/
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class txPredicatedNodeTest : public txNodeTest
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{
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public:
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txPredicatedNodeTest(txNodeTest* aNodeTest, Expr* aPredicate);
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TX_DECL_NODE_TEST
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private:
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nsAutoPtr<txNodeTest> mNodeTest;
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nsAutoPtr<Expr> mPredicate;
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};
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/**
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* Represents an ordered list of Predicates,
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* for use with Step and Filter Expressions
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**/
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class PredicateList {
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public:
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/**
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* Adds the given Expr to the list.
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* The ownership of the given Expr is passed over the PredicateList,
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* even on failure.
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* @param aExpr the Expr to add to the list
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* @return nsresult indicating out of memory
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*/
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nsresult add(Expr* aExpr)
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{
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NS_ASSERTION(aExpr, "missing expression");
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return mPredicates.AppendElement(aExpr) ?
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NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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nsresult evaluatePredicates(txNodeSet* aNodes, txIMatchContext* aContext);
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/**
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* Drops the first predicate without deleting it.
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*/
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void dropFirst()
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{
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mPredicates.RemoveElementAt(0);
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}
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/**
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* returns true if this predicate list is empty
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**/
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bool isEmpty()
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{
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return mPredicates.IsEmpty();
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}
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#ifdef TX_TO_STRING
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/**
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* Returns the String representation of this PredicateList.
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* @param dest the String to use when creating the String
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* representation. The String representation will be appended to
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* any data in the destination String, to allow cascading calls to
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* other #toString() methods for Expressions.
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* @return the String representation of this PredicateList.
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**/
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void toString(nsAString& dest);
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#endif
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protected:
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bool isSensitiveTo(Expr::ContextSensitivity aContext);
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Expr* getSubExprAt(uint32_t aPos)
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{
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|
return mPredicates.SafeElementAt(aPos);
|
|
}
|
|
void setSubExprAt(uint32_t aPos, Expr* aExpr)
|
|
{
|
|
NS_ASSERTION(aPos < mPredicates.Length(),
|
|
"setting bad subexpression index");
|
|
mPredicates[aPos] = aExpr;
|
|
}
|
|
|
|
//-- list of predicates
|
|
txOwningArray<Expr> mPredicates;
|
|
}; //-- PredicateList
|
|
|
|
class LocationStep : public Expr,
|
|
public PredicateList
|
|
{
|
|
public:
|
|
enum LocationStepType {
|
|
ANCESTOR_AXIS = 0,
|
|
ANCESTOR_OR_SELF_AXIS,
|
|
ATTRIBUTE_AXIS,
|
|
CHILD_AXIS,
|
|
DESCENDANT_AXIS,
|
|
DESCENDANT_OR_SELF_AXIS,
|
|
FOLLOWING_AXIS,
|
|
FOLLOWING_SIBLING_AXIS,
|
|
NAMESPACE_AXIS,
|
|
PARENT_AXIS,
|
|
PRECEDING_AXIS,
|
|
PRECEDING_SIBLING_AXIS,
|
|
SELF_AXIS
|
|
};
|
|
|
|
/**
|
|
* Creates a new LocationStep using the given NodeExpr and Axis Identifier
|
|
* @param nodeExpr the NodeExpr to use when matching Nodes
|
|
* @param axisIdentifier the Axis Identifier in which to search for nodes
|
|
**/
|
|
LocationStep(txNodeTest* aNodeTest,
|
|
LocationStepType aAxisIdentifier)
|
|
: mNodeTest(aNodeTest),
|
|
mAxisIdentifier(aAxisIdentifier)
|
|
{
|
|
}
|
|
|
|
TX_DECL_OPTIMIZABLE_EXPR
|
|
|
|
txNodeTest* getNodeTest()
|
|
{
|
|
return mNodeTest;
|
|
}
|
|
void setNodeTest(txNodeTest* aNodeTest)
|
|
{
|
|
mNodeTest.forget();
|
|
mNodeTest = aNodeTest;
|
|
}
|
|
LocationStepType getAxisIdentifier()
|
|
{
|
|
return mAxisIdentifier;
|
|
}
|
|
void setAxisIdentifier(LocationStepType aAxisIdentifier)
|
|
{
|
|
mAxisIdentifier = aAxisIdentifier;
|
|
}
|
|
|
|
private:
|
|
void fromDescendants(const txXPathNode& aNode, txIMatchContext* aCs,
|
|
txNodeSet* aNodes);
|
|
void fromDescendantsRev(const txXPathNode& aNode, txIMatchContext* aCs,
|
|
txNodeSet* aNodes);
|
|
|
|
nsAutoPtr<txNodeTest> mNodeTest;
|
|
LocationStepType mAxisIdentifier;
|
|
};
|
|
|
|
class FilterExpr : public Expr,
|
|
public PredicateList
|
|
{
|
|
public:
|
|
|
|
/**
|
|
* Creates a new FilterExpr using the given Expr
|
|
* @param expr the Expr to use for evaluation
|
|
*/
|
|
explicit FilterExpr(Expr* aExpr)
|
|
: expr(aExpr)
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
nsAutoPtr<Expr> expr;
|
|
|
|
}; //-- FilterExpr
|
|
|
|
|
|
class txLiteralExpr : public Expr {
|
|
public:
|
|
explicit txLiteralExpr(double aDbl)
|
|
: mValue(new NumberResult(aDbl, nullptr))
|
|
{
|
|
}
|
|
explicit txLiteralExpr(const nsAString& aStr)
|
|
: mValue(new StringResult(aStr, nullptr))
|
|
{
|
|
}
|
|
explicit txLiteralExpr(txAExprResult* aValue)
|
|
: mValue(aValue)
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
RefPtr<txAExprResult> mValue;
|
|
};
|
|
|
|
/**
|
|
* Represents an UnaryExpr. Returns the negative value of its expr.
|
|
**/
|
|
class UnaryExpr : public Expr {
|
|
|
|
public:
|
|
|
|
explicit UnaryExpr(Expr* aExpr)
|
|
: expr(aExpr)
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
nsAutoPtr<Expr> expr;
|
|
}; //-- UnaryExpr
|
|
|
|
/**
|
|
* Represents a BooleanExpr, a binary expression that
|
|
* performs a boolean operation between its lvalue and rvalue.
|
|
**/
|
|
class BooleanExpr : public Expr
|
|
{
|
|
public:
|
|
|
|
//-- BooleanExpr Types
|
|
enum _BooleanExprType { AND = 1, OR };
|
|
|
|
BooleanExpr(Expr* aLeftExpr, Expr* aRightExpr, short aOp)
|
|
: leftExpr(aLeftExpr),
|
|
rightExpr(aRightExpr),
|
|
op(aOp)
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
nsAutoPtr<Expr> leftExpr, rightExpr;
|
|
short op;
|
|
}; //-- BooleanExpr
|
|
|
|
/**
|
|
* Represents a MultiplicativeExpr, a binary expression that
|
|
* performs a multiplicative operation between its lvalue and rvalue:
|
|
* * : multiply
|
|
* mod : modulus
|
|
* div : divide
|
|
*
|
|
**/
|
|
class txNumberExpr : public Expr
|
|
{
|
|
public:
|
|
|
|
enum eOp { ADD, SUBTRACT, DIVIDE, MULTIPLY, MODULUS };
|
|
|
|
txNumberExpr(Expr* aLeftExpr, Expr* aRightExpr, eOp aOp)
|
|
: mLeftExpr(aLeftExpr),
|
|
mRightExpr(aRightExpr),
|
|
mOp(aOp)
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
nsAutoPtr<Expr> mLeftExpr, mRightExpr;
|
|
eOp mOp;
|
|
}; //-- MultiplicativeExpr
|
|
|
|
/**
|
|
* Represents a RelationalExpr, an expression that compares its lvalue
|
|
* to its rvalue using:
|
|
* = : equal to
|
|
* < : less than
|
|
* > : greater than
|
|
* <= : less than or equal to
|
|
* >= : greater than or equal to
|
|
*
|
|
**/
|
|
class RelationalExpr : public Expr
|
|
{
|
|
public:
|
|
enum RelationalExprType {
|
|
EQUAL,
|
|
NOT_EQUAL,
|
|
LESS_THAN,
|
|
GREATER_THAN,
|
|
LESS_OR_EQUAL,
|
|
GREATER_OR_EQUAL
|
|
};
|
|
|
|
RelationalExpr(Expr* aLeftExpr, Expr* aRightExpr, RelationalExprType aOp)
|
|
: mLeftExpr(aLeftExpr),
|
|
mRightExpr(aRightExpr),
|
|
mOp(aOp)
|
|
{
|
|
}
|
|
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
bool compareResults(txIEvalContext* aContext, txAExprResult* aLeft,
|
|
txAExprResult* aRight);
|
|
|
|
nsAutoPtr<Expr> mLeftExpr;
|
|
nsAutoPtr<Expr> mRightExpr;
|
|
RelationalExprType mOp;
|
|
};
|
|
|
|
/**
|
|
* VariableRefExpr
|
|
* Represents a variable reference ($refname)
|
|
**/
|
|
class VariableRefExpr : public Expr {
|
|
|
|
public:
|
|
|
|
VariableRefExpr(nsIAtom* aPrefix, nsIAtom* aLocalName, int32_t aNSID);
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
nsCOMPtr<nsIAtom> mPrefix;
|
|
nsCOMPtr<nsIAtom> mLocalName;
|
|
int32_t mNamespace;
|
|
};
|
|
|
|
/**
|
|
* Represents a PathExpr
|
|
**/
|
|
class PathExpr : public Expr {
|
|
|
|
public:
|
|
|
|
//-- Path Operators
|
|
//-- RELATIVE_OP is the default
|
|
//-- LF, changed from static const short to enum
|
|
enum PathOperator { RELATIVE_OP, DESCENDANT_OP };
|
|
|
|
/**
|
|
* Adds the Expr to this PathExpr
|
|
* The ownership of the given Expr is passed over the PathExpr,
|
|
* even on failure.
|
|
* @param aExpr the Expr to add to this PathExpr
|
|
* @return nsresult indicating out of memory
|
|
*/
|
|
nsresult addExpr(Expr* aExpr, PathOperator pathOp);
|
|
|
|
/**
|
|
* Removes and deletes the expression at the given index.
|
|
*/
|
|
void deleteExprAt(uint32_t aPos)
|
|
{
|
|
NS_ASSERTION(aPos < mItems.Length(),
|
|
"killing bad expression index");
|
|
mItems.RemoveElementAt(aPos);
|
|
}
|
|
|
|
TX_DECL_OPTIMIZABLE_EXPR
|
|
|
|
PathOperator getPathOpAt(uint32_t aPos)
|
|
{
|
|
NS_ASSERTION(aPos < mItems.Length(), "getting bad pathop index");
|
|
return mItems[aPos].pathOp;
|
|
}
|
|
void setPathOpAt(uint32_t aPos, PathOperator aPathOp)
|
|
{
|
|
NS_ASSERTION(aPos < mItems.Length(), "setting bad pathop index");
|
|
mItems[aPos].pathOp = aPathOp;
|
|
}
|
|
|
|
private:
|
|
class PathExprItem {
|
|
public:
|
|
nsAutoPtr<Expr> expr;
|
|
PathOperator pathOp;
|
|
};
|
|
|
|
nsTArray<PathExprItem> mItems;
|
|
|
|
/*
|
|
* Selects from the descendants of the context node
|
|
* all nodes that match the Expr
|
|
*/
|
|
nsresult evalDescendants(Expr* aStep, const txXPathNode& aNode,
|
|
txIMatchContext* aContext,
|
|
txNodeSet* resNodes);
|
|
};
|
|
|
|
/**
|
|
* This class represents a RootExpr, which only matches the Document node
|
|
**/
|
|
class RootExpr : public Expr {
|
|
public:
|
|
/**
|
|
* Creates a new RootExpr
|
|
*/
|
|
RootExpr()
|
|
#ifdef TX_TO_STRING
|
|
: mSerialize(true)
|
|
#endif
|
|
{
|
|
}
|
|
|
|
TX_DECL_EXPR
|
|
|
|
#ifdef TX_TO_STRING
|
|
public:
|
|
void setSerialize(bool aSerialize)
|
|
{
|
|
mSerialize = aSerialize;
|
|
}
|
|
|
|
private:
|
|
// When a RootExpr is used in a PathExpr it shouldn't be serialized
|
|
bool mSerialize;
|
|
#endif
|
|
}; //-- RootExpr
|
|
|
|
/**
|
|
* Represents a UnionExpr
|
|
**/
|
|
class UnionExpr : public Expr {
|
|
public:
|
|
/**
|
|
* Adds the PathExpr to this UnionExpr
|
|
* The ownership of the given Expr is passed over the UnionExpr,
|
|
* even on failure.
|
|
* @param aExpr the Expr to add to this UnionExpr
|
|
* @return nsresult indicating out of memory
|
|
*/
|
|
nsresult addExpr(Expr* aExpr)
|
|
{
|
|
return mExpressions.AppendElement(aExpr) ?
|
|
NS_OK : NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
/**
|
|
* Removes and deletes the expression at the given index.
|
|
*/
|
|
void deleteExprAt(uint32_t aPos)
|
|
{
|
|
NS_ASSERTION(aPos < mExpressions.Length(),
|
|
"killing bad expression index");
|
|
|
|
delete mExpressions[aPos];
|
|
mExpressions.RemoveElementAt(aPos);
|
|
}
|
|
|
|
TX_DECL_OPTIMIZABLE_EXPR
|
|
|
|
private:
|
|
|
|
txOwningArray<Expr> mExpressions;
|
|
|
|
}; //-- UnionExpr
|
|
|
|
/**
|
|
* Class specializing in executing expressions like "@foo" where we are
|
|
* interested in different result-types, and expressions like "@foo = 'hi'"
|
|
*/
|
|
class txNamedAttributeStep : public Expr
|
|
{
|
|
public:
|
|
txNamedAttributeStep(int32_t aNsID, nsIAtom* aPrefix,
|
|
nsIAtom* aLocalName);
|
|
|
|
TX_DECL_EXPR
|
|
|
|
private:
|
|
int32_t mNamespace;
|
|
nsCOMPtr<nsIAtom> mPrefix;
|
|
nsCOMPtr<nsIAtom> mLocalName;
|
|
};
|
|
|
|
/**
|
|
*
|
|
*/
|
|
class txUnionNodeTest : public txNodeTest
|
|
{
|
|
public:
|
|
nsresult addNodeTest(txNodeTest* aNodeTest)
|
|
{
|
|
return mNodeTests.AppendElement(aNodeTest) ?
|
|
NS_OK : NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
TX_DECL_NODE_TEST
|
|
|
|
private:
|
|
txOwningArray<txNodeTest> mNodeTests;
|
|
};
|
|
|
|
/**
|
|
* Expression that failed to parse
|
|
*/
|
|
class txErrorExpr : public Expr
|
|
{
|
|
public:
|
|
#ifdef TX_TO_STRING
|
|
explicit txErrorExpr(const nsAString& aStr)
|
|
: mStr(aStr)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
TX_DECL_EXPR
|
|
|
|
#ifdef TX_TO_STRING
|
|
private:
|
|
nsString mStr;
|
|
#endif
|
|
};
|
|
|
|
#endif
|
|
|
|
|