## Xalan-C++ API Documentation

### The Xalan C++ XSLT Processor Version 1.6

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# VariablesStack.hpp

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    00001 /*
    00002  * The Apache Software License, Version 1.1
    00003  *
    00004  *
    00005  * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
    00006  * reserved.
    00007  *
    00008  * Redistribution and use in source and binary forms, with or without
    00009  * modification, are permitted provided that the following conditions
    00010  * are met:
    00011  *
    00012  * 1. Redistributions of source code must retain the above copyright
    00013  *    notice, this list of conditions and the following disclaimer.
    00014  *
    00015  * 2. Redistributions in binary form must reproduce the above copyright
    00016  *    notice, this list of conditions and the following disclaimer in
    00017  *    the documentation and/or other materials provided with the
    00018  *    distribution.
    00019  *
    00020  * 3. The end-user documentation included with the redistribution,
    00021  *    if any, must include the following acknowledgment:
    00022  *       "This product includes software developed by the
    00023  *        Apache Software Foundation (http://www.apache.org/)."
    00024  *    Alternately, this acknowledgment may appear in the software itself,
    00025  *    if and wherever such third-party acknowledgments normally appear.
    00026  *
    00027  * 4. The names "Xalan" and "Apache Software Foundation" must
    00028  *    not be used to endorse or promote products derived from this
    00029  *    software without prior written permission. For written
    00030  *    permission, please contact apache@apache.org.
    00031  *
    00032  * 5. Products derived from this software may not be called "Apache",
    00033  *    nor may "Apache" appear in their name, without prior written
    00034  *    permission of the Apache Software Foundation.
    00035  *
    00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    00043  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    00044  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    00045  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00047  * SUCH DAMAGE.
    00048  * ====================================================================
    00049  *
    00050  * This software consists of voluntary contributions made by many
    00051  * individuals on behalf of the Apache Software Foundation and was
    00052  * originally based on software copyright (c) 1999, International
    00053  * Business Machines, Inc., http://www.ibm.com.  For more
    00054  * information on the Apache Software Foundation, please see
    00055  * <http://www.apache.org/>.
    00056  */
    00057 #if !defined(XALAN_VARIABLESSTACK_HEADER_GUARD)
    00058 #define XALAN_VARIABLESSTACK_HEADER_GUARD
    00059
    00060
    00061
    00062 // Base include file.  Must be first.
    00063 #include <xalanc/XSLT/XSLTDefinitions.hpp>
    00064
    00065
    00066
    00067 #include <cassert>
    00068 #include <vector>
    00069
    00070
    00071
    00072 #include <xalanc/XPath/XalanQName.hpp>
    00073 #include <xalanc/XPath/XObject.hpp>
    00074
    00075
    00076
    00077 #include <xalanc/XSLT/XSLTProcessorException.hpp>
    00078
    00079
    00080
    00081 XALAN_CPP_NAMESPACE_BEGIN
    00082
    00083
    00084
    00085 class Arg;
    00086 class ElemTemplateElement;
    00087 class ElemVariable;
    00088 class StylesheetExecutionContext;
    00089 class XalanNode;
    00090
    00091
    00092
    00096 class XALAN_XSLT_EXPORT VariablesStack
    00097 {
    00098 public:
    00099
    00103     explicit
    00104     VariablesStack();
    00105
    00106     ~VariablesStack();
    00107
    00108
    00112     void
    00113     reset();
    00114
    00120     void
    00121     pushElementFrame(const ElemTemplateElement*     elem);
    00122
    00128     void
    00129     popElementFrame(const ElemTemplateElement*  elem);
    00130
    00138     void
    00139     pushContextMarker();
    00140
    00144     void
    00145     popContextMarker();
    00146
    00147     struct ParamsVectorEntry
    00148     {
    00149         ParamsVectorEntry() :
    00150             m_qname(0),
    00151             m_value(),
    00152             m_variable(0)
    00153         {
    00154         }
    00155
    00156         ParamsVectorEntry(
    00157                 const XalanQName*   qname,
    00158                 const XObjectPtr    value) :
    00159             m_qname(qname),
    00160             m_value(value),
    00161             m_variable(0)
    00162         {
    00163         }
    00164
    00165         ParamsVectorEntry(
    00166                 const XalanQName*       qname,
    00167                 const ElemVariable*     variable) :
    00168             m_qname(qname),
    00169             m_value(),
    00170             m_variable(variable)
    00171         {
    00172         }
    00173
    00174         const XalanQName*       m_qname;
    00175
    00176         XObjectPtr              m_value;
    00177
    00178         const ElemVariable*     m_variable;
    00179     };
    00180
    00181 #if defined(XALAN_NO_STD_NAMESPACE)
    00182     typedef vector<ParamsVectorEntry>       ParamsVectorType;
    00183     typedef vector<const ElemVariable*>     RecursionGuardStackType;
    00184 #else
    00185     typedef std::vector<ParamsVectorEntry>      ParamsVectorType;
    00186     typedef std::vector<const ElemVariable*>    RecursionGuardStackType;
    00187 #endif
    00188
    00196     void
    00197     pushParams(
    00198             const ParamsVectorType&     theParams,
    00199             const ElemTemplateElement*  targetTemplate);
    00200
    00211     const XObjectPtr
    00212     getParamVariable(
    00213             const XalanQName&               qname,
    00214             StylesheetExecutionContext&     executionContext,
    00215             bool&                           fNameFound)
    00216     {
    00217         return findXObject(qname, executionContext, true, false, fNameFound);
    00218     }
    00219
    00231     const XObjectPtr
    00232     getVariable(
    00233             const XalanQName&               qname,
    00234             StylesheetExecutionContext&     executionContext,
    00235             bool&                           fNameFound)
    00236     {
    00237         return findXObject(qname, executionContext, false, true, fNameFound);
    00238     }
    00239
    00249     void
    00250     pushVariable(
    00251             const XalanQName&           name,
    00252             const ElemVariable*         var,
    00253             const ElemTemplateElement*  e);
    00254
    00264     void
    00265     pushVariable(
    00266             const XalanQName&           name,
    00267             const XObjectPtr&           val,
    00268             const ElemTemplateElement*  e);
    00269
    00273     void
    00274     start();
    00275
    00279     void
    00280     resetParams();
    00281
    00285     void
    00286     markGlobalStackFrame();
    00287
    00291     void
    00292     unmarkGlobalStackFrame();
    00293
    00301     void
    00302     setCurrentStackFrameIndex(int   currentStackFrameIndex = -1)
    00303     {
    00304         if (currentStackFrameIndex == -1)
    00305             m_currentStackFrameIndex = m_stack.size();
    00306         else
    00307             m_currentStackFrameIndex = currentStackFrameIndex;
    00308     }
    00309
    00316     int
    00317     getCurrentStackFrameIndex() const
    00318     {
    00319         return m_currentStackFrameIndex;
    00320     }
    00321
    00327     int
    00328     getGlobalStackFrameIndex() const
    00329     {
    00330         return m_globalStackFrameIndex;
    00331     }
    00332
    00333     class InvalidStackContextException : public XSLTProcessorException
    00334     {
    00335     public:
    00336
    00337         InvalidStackContextException();
    00338
    00339         virtual
    00340         ~InvalidStackContextException();
    00341
    00342     private:
    00343
    00344     };
    00345
    00346     class PushParamFunctor
    00347     {
    00348     public:
    00349
    00350         PushParamFunctor(VariablesStack&    theVariablesStack) :
    00351             m_variablesStack(theVariablesStack)
    00352         {
    00353         }
    00354
    00355         void
    00356         operator()(const ParamsVectorType::value_type&  theEntry) const;
    00357
    00358     private:
    00359
    00360         VariablesStack&     m_variablesStack;
    00361     };
    00362
    00363     class XALAN_XSLT_EXPORT StackEntry
    00364     {
    00365     public:
    00366
    00371         enum eType { eContextMarker,
    00372                     eVariable,
    00373                     eParam,
    00374                     eActiveParam,
    00375                     eElementFrameMarker,
    00376                     eNextValue };
    00377
    00381         explicit
    00382         StackEntry();
    00383
    00387         StackEntry(
    00388             const XalanQName*   name,
    00389             const XObjectPtr&   val,
    00390             bool                isParam = false);
    00391
    00395         StackEntry(
    00396             const XalanQName*       name,
    00397             const ElemVariable*     var,
    00398             bool                    isParam = false);
    00399
    00403         StackEntry(const ElemTemplateElement*   elem);
    00404
    00405
    00409         StackEntry(const StackEntry&    theSource);
    00410
    00414         ~StackEntry();
    00415
    00421         eType
    00422         getType() const
    00423         {
    00424             return m_type;
    00425         }
    00426
    00432         const XalanQName*
    00433         getName() const
    00434         {
    00435             return m_qname;
    00436         }
    00437
    00443         const XObjectPtr&
    00444         getValue() const
    00445         {
    00446             return m_value;
    00447         }
    00448
    00454         void
    00455         setValue(const XObjectPtr&  theValue)
    00456         {
    00457             m_value = theValue;
    00458         }
    00459
    00465         const ElemVariable*
    00466         getVariable() const
    00467         {
    00468             return m_variable;
    00469         }
    00470
    00471         void
    00472         activate();
    00473
    00474         void
    00475         deactivate();
    00476
    00482         const ElemTemplateElement*
    00483         getElement() const
    00484         {
    00485             return m_element;
    00486         }
    00487
    00488         StackEntry&
    00489         operator=(const StackEntry&     theRHS);
    00490
    00491         bool
    00492         operator==(const StackEntry&    theRHS) const;
    00493
    00494     private:
    00495
    00496         // Data members...
    00497         eType                       m_type;
    00498
    00499         const XalanQName*           m_qname;
    00500
    00501         XObjectPtr                  m_value;
    00502
    00503         const ElemVariable*         m_variable;
    00504
    00505         const ElemTemplateElement*  m_element;
    00506     };
    00507
    00508 #if defined(XALAN_NO_STD_NAMESPACE)
    00509     typedef vector<StackEntry>          VariableStackStackType;
    00510 #else
    00511     typedef std::vector<StackEntry>     VariableStackStackType;
    00512 #endif
    00513
    00514     enum { eDefaultStackSize = 100 };
    00515
    00516 private:
    00517
    00525     bool
    00526     elementFrameAlreadyPushed(const ElemTemplateElement*    elem) const;
    00527
    00533     void
    00534     push(const StackEntry&  theEntry);
    00535
    00539     void
    00540     pop();
    00541
    00547     const StackEntry&
    00548     back() const
    00549     {
    00550         assert(m_stack.empty() == false);
    00551
    00552         return m_stack.back();
    00553     }
    00554
    00555     friend class CommitPushElementFrame;
    00556     friend class EnsurePop;
    00557     friend class PushParamFunctor;
    00558     friend class SetAndRestoreForceGlobalSearch;
    00559
    00560     const XObjectPtr
    00561     findXObject(
    00562             const XalanQName&               name,
    00563             StylesheetExecutionContext&     executionContext,
    00564             bool                            fIsParam,
    00565             bool                            fSearchGlobalSpace,
    00566             bool&                           fNameFound);
    00567
    00568     VariableStackStackType::size_type
    00569     findEntry(
    00570             const XalanQName&   name,
    00571             bool                fIsParam,
    00572             bool                fSearchGlobalSpace);
    00573
    00574
    00575     VariableStackStackType      m_stack;
    00576
    00577     int                         m_globalStackFrameIndex;
    00578
    00579     bool                        m_globalStackFrameMarked;
    00580
    00586     unsigned int                m_currentStackFrameIndex;
    00587
    00593     RecursionGuardStackType     m_guardStack;
    00594 };
    00595
    00596
    00597
    00598 XALAN_CPP_NAMESPACE_END
    00599
    00600
    00601
    00602 #endif  // #if !defined(XALAN_VARIABLESSTACK_HEADER_GUARD)

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Xalan-C++ XSLT Processor Version 1.6 Copyright © 2000, 2001, 2002, 2003 The Apache Software Foundation. All Rights Reserved.