/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "ElemAttribute.hpp"



#include <xercesc/sax/AttributeList.hpp>



#include <xalanc/PlatformSupport/DOMStringHelper.hpp>
#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>
#include <xalanc/PlatformSupport/XalanUnicode.hpp>



#include <xalanc/DOMSupport/DOMServices.hpp>



#include "AVT.hpp"
#include "Constants.hpp"
#include "StylesheetConstructionContext.hpp"
#include "StylesheetExecutionContext.hpp"



namespace XALAN_CPP_NAMESPACE {



typedef StylesheetExecutionContext::GetCachedString     GetCachedString;



ElemAttribute::ElemAttribute(
            StylesheetConstructionContext&  constructionContext,
            Stylesheet&                     stylesheetTree,
            const AttributeListType&        atts,
            XalanFileLoc                    lineNumber,
            XalanFileLoc                    columnNumber) :
    ElemTemplateElement(constructionContext,
                        stylesheetTree,
                        lineNumber,
                        columnNumber,
                        StylesheetConstructionContext::ELEMNAME_ATTRIBUTE),
    m_nameAVT(0),   
    m_namespaceAVT(0)
{
    const XalanSize_t   nAttrs = atts.getLength();

    for (XalanSize_t i = 0; i < nAttrs; i++)
    {
        const XalanDOMChar* const   aname = atts.getName(i);

        if(equals(aname, Constants::ATTRNAME_NAME))
        {
            m_nameAVT =
                constructionContext.createAVT(getLocator(), aname, atts.getValue(i), *this);
        }
        else if(equals(aname, Constants::ATTRNAME_NAMESPACE))
        {
            m_namespaceAVT =
                constructionContext.createAVT(getLocator(), aname, atts.getValue(i), *this);
        }
        else if(isAttrOK(
                    aname,
                    atts,
                    i,
                    constructionContext) == false &&
                processSpaceAttr(
                    Constants::ELEMNAME_ATTRIBUTE_WITH_PREFIX_STRING.c_str(),
                    aname,
                    atts,
                    i,
                    constructionContext) == false)
        {
            error(
                constructionContext,
                XalanMessages::ElementHasIllegalAttribute_2Param,
                Constants::ELEMNAME_ATTRIBUTE_WITH_PREFIX_STRING.c_str(),
                aname);
        }
    }

    if(0 == m_nameAVT)
    {
        XalanDOMString  theResult(constructionContext.getMemoryManager());

        error(
            constructionContext,
            XalanMessages::ElementMustHaveAttribute_2Param, 
            Constants::ELEMNAME_ATTRIBUTE_WITH_PREFIX_STRING,
            Constants::ATTRNAME_NAME);
    } 
}



ElemAttribute::~ElemAttribute()
{
}



const XalanDOMString&
ElemAttribute::getElementName() const
{
    return Constants::ELEMNAME_ATTRIBUTE_WITH_PREFIX_STRING;
}



#if !defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
const ElemTemplateElement*
ElemAttribute::startElement(StylesheetExecutionContext& executionContext) const
{
    assert(m_nameAVT != 0);

    ElemTemplateElement::startElement(executionContext);

    XalanDOMString&     attrName = executionContext.getAndPushCachedString();
    
    m_nameAVT->evaluate(attrName, *this, executionContext);

    if(XalanQName::isValidQName(attrName) == false)
    {
        warn(
            executionContext,
            XalanMessages::AttributeNameNotValidQName_1Param, 
            attrName);

        executionContext.pushProcessCurrentAttribute(false);
    }
    else
    {
        // save original attribute name
        const GetCachedString   origAttrNameGuard(executionContext);

        XalanDOMString&     origAttrName = origAttrNameGuard.get();

        origAttrName.assign(attrName);

        const XalanDOMString::size_type     origAttrNameLength = origAttrName.length();

        XalanDOMString::size_type           indexOfNSSep = 0;

        const GetCachedString   attrNameSpaceGuard(executionContext);

        XalanDOMString&     attrNameSpace = attrNameSpaceGuard.get();

        if(0 != m_namespaceAVT)
        {
            m_namespaceAVT->evaluate(attrNameSpace, *this, executionContext);

            indexOfNSSep = indexOf(origAttrName, XalanUnicode::charColon);

            if (attrNameSpace.empty())
            {
                // If there's no namespace, but the attribute has a
                // prefix, then we must strip the prefix off.
                if (indexOfNSSep < origAttrNameLength)
                {
                    substring(origAttrName, attrName, indexOfNSSep + 1);
                }

                // We set this to indicate that there is no prefix any
                // longer.
                indexOfNSSep = origAttrNameLength;
            }
            else
            {
                // See if the namespace already exists.  If it does, we'll get the
                // prefix that was used when it was declared.
                const XalanDOMString*  const    prefix =
                    executionContext.getResultPrefixForNamespace(attrNameSpace);

                // If there is already a prefix for the namespace, and it's length
                // is not 0, and there is no prefix on the attribute name, or
                // it's equal to the prefix on the attribute, then go ahead
                // and use that prefix.
                if(prefix != 0 &&
                   prefix->empty() == false &&
                   (indexOfNSSep == origAttrNameLength ||
                    equals(prefix->c_str(), attrName.c_str(), indexOfNSSep) == true))
                {
                    if(indexOfNSSep < origAttrNameLength)
                    {
                        attrName.reserve(attrName.length() - (indexOfNSSep + 1) + DOMServices::s_XMLNamespaceSeparatorStringLength + prefix->length() + 1);

                        attrName.erase(0, indexOfNSSep + 1);
                    }
                    else
                    {
                        attrName.reserve(
                            attrName.length() + DOMServices::s_XMLNamespaceSeparatorStringLength + prefix->length() + 1);
                    }

                    attrName.insert(0, DOMServices::s_XMLNamespaceSeparatorString);
                    attrName.insert(0, *prefix);
                }
                else
                {
                    const GetCachedString   newPrefixGuard(executionContext);

                    XalanDOMString&     newPrefix = newPrefixGuard.get();

                    // If the prefix on the QName is xmlns, we cannot use it.
                    const bool          fPrefixIsXMLNS =
                        startsWith(origAttrName, DOMServices::s_XMLNamespaceWithSeparator);

                    // If there's a prefix, and it's not xmlns, then use
                    // the prefix that's provided.
                    if(indexOfNSSep < origAttrNameLength &&
                        fPrefixIsXMLNS == false)
                    {
                        substring(origAttrName, newPrefix, 0, indexOfNSSep);

                        // OK, make sure that the prefix provided maps to
                        // the same namespace as the one the user requested,
                        // and see if it's in use...
                        const XalanDOMString* const theNamespace =
                            executionContext.getResultNamespaceForPrefix(newPrefix);

                        if (theNamespace != 0 &&
                            equals(*theNamespace, attrNameSpace) == false &&
                            executionContext.isPendingResultPrefix(newPrefix) == true)
                        {
                            // It doesn't, so we'll need to manufacture a
                            // prefix.
                            newPrefix.clear();

                            // Strip the user-supplied prefix from the name...
                            substring(origAttrName, attrName, indexOfNSSep + 1);
                        }
                    }

                    if (newPrefix.empty() == true)
                    {
                        // If there's a prefix, and it's xmlns, then strip it
                        // off...
                        if (fPrefixIsXMLNS == true)
                        {
                            attrName.erase(0, indexOfNSSep + 1);
                        }

                        // Get a new, unique namespace prefix...
                        executionContext.getUniqueNamespaceValue(newPrefix);

                        // Reserve some space in the string.
                        attrName.reserve(
                            attrName.length() + DOMServices::s_XMLNamespaceSeparatorStringLength + newPrefix.length() + 1);

                        attrName.insert(0, DOMServices::s_XMLNamespaceSeparatorString);
                        attrName.insert(0, newPrefix);
                    }

                    // OK, now we have to generate a namespace declaration...
                    const GetCachedString   nsDeclGuard(executionContext);

                    XalanDOMString&     nsDecl = nsDeclGuard.get();

                    nsDecl.reserve(DOMServices::s_XMLNamespaceWithSeparatorLength + newPrefix.length() + 1);

                    nsDecl.assign(DOMServices::s_XMLNamespaceWithSeparator);

                    nsDecl.append(newPrefix);

                    // Add the namespace declaration...
                    executionContext.addResultAttribute(nsDecl, attrNameSpace);
                }
            }
        }
      // Note we are using original attribute name for these tests. 
        else if(executionContext.isElementPending() == true &&
                !equals(origAttrName, DOMServices::s_XMLNamespace))
        {
            // Don't try to create a namespace declaration for anything that
            // starts with xml:
            if (startsWith(origAttrName, DOMServices::s_XMLString) == true)
            {
                // This just fakes out the test below.  It would be better if
                // we had a better way of testing this...
                indexOfNSSep = origAttrNameLength;
            }
            else
            {
                // make sure that if a prefix is specified on the attribute name, it is valid
                indexOfNSSep = indexOf(origAttrName, XalanUnicode::charColon);

                if(indexOfNSSep < origAttrNameLength)
                {
                    const GetCachedString   nsprefixGuard(executionContext);

                    XalanDOMString&     nsprefix = nsprefixGuard.get();

                    substring(origAttrName, nsprefix, 0, indexOfNSSep);

                    const XalanDOMString* const     theNamespace =
                        getNamespaceForPrefix(nsprefix);

                    if (theNamespace != 0)
                    {
                        attrNameSpace.assign(*theNamespace);

                        const XalanDOMString* const     theResultNamespace =
                            executionContext.getResultNamespaceForPrefix(nsprefix);

                        if (theResultNamespace != 0 &&
                            *theNamespace != *theResultNamespace)
                        {
                            // Oops! There's a conflict between an existing
                            // result namespace and the attribute's namespace.
                            // To be safe, because we are generating namespace
                            // declaration here, rather than somewhere that
                            // knows more about how that result namespace is
                            // used, let's change the prefix of the attribute.
                            nsprefix.clear();

                            executionContext.getUniqueNamespaceValue(nsprefix);

                            // Fix the name by removing the original prefix and
                            // inserting the new one.
                            attrName.erase(0, indexOfNSSep);
                            attrName.insert(attrName.begin(), nsprefix.begin(), nsprefix.end());
                        }
                    }

                    if (attrNameSpace.empty())
                    {
                        warn(
                            executionContext,
                            XalanMessages::PrefixIsNotDeclared_1Param,
                            nsprefix);
                    }
                    else
                    {
                        // Check to see if there's already a namespace declaration in scope...
                        const XalanDOMString* const     prefix =
                            executionContext.getResultPrefixForNamespace(attrNameSpace);

                        if (prefix == 0)
                        {
                            // We need to generate a namespace declaration...
                            const GetCachedString   nsDeclGuard(executionContext);

                            XalanDOMString&     nsDecl = nsDeclGuard.get();

                            nsDecl.reserve(DOMServices::s_XMLNamespaceWithSeparatorLength + nsprefix.length() + 1);

                            nsDecl.assign(DOMServices::s_XMLNamespaceWithSeparator);

                            nsDecl.append(nsprefix);

                            // Add the namespace declaration...
                            executionContext.addResultAttribute(nsDecl, attrNameSpace);
                        }
                    }
                }
            }
        }
        else
        {
            warn(
                executionContext,
                XalanMessages::AttributesCannotBeAdded);
        }

        // If there was no namespace, or the namespace was resolved, process
        // the result attribute.
        
        if (indexOfNSSep == origAttrNameLength || !attrNameSpace.empty())
        {
            executionContext.pushProcessCurrentAttribute(true);
            executionContext.pushCopyTextNodesOnly(true);
        
            XalanDOMString& theResult = executionContext.getAndPushCachedString();
                    
            return beginChildrenToString(executionContext,theResult);
                
        } 
        else
        {
            executionContext.pushProcessCurrentAttribute(false);
        }
    }

    executionContext.getAndPopCachedString();

    return 0;
}



void
ElemAttribute::endElement(StylesheetExecutionContext&       executionContext) const
{
    if (executionContext.popProcessCurrentAttribute() == true)
    {
        endChildrenToString(executionContext);

        XalanDOMString& theResult = executionContext.getAndPopCachedString();
        XalanDOMString& attrName = executionContext.getAndPopCachedString();

        executionContext.addResultAttribute(attrName,theResult);

        executionContext.popCopyTextNodesOnly();
    }
}
#endif



#if defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
void
ElemAttribute::execute(StylesheetExecutionContext&  executionContext) const
{
    assert(m_nameAVT != 0);

    ElemTemplateElement::execute(executionContext);

    const GetCachedString   attrNameGuard(executionContext);

    XalanDOMString&     attrName = attrNameGuard.get();

    m_nameAVT->evaluate(attrName, *this, executionContext);

    if(XalanQName::isValidQName(attrName) == false)
    {
        warn(
            executionContext,
            XalanMessages::AttributeNameNotValidQName_1Param,
            attrName);
    }
    else
    {
        // save original attribute name
        const GetCachedString   origAttrNameGuard(executionContext);

        XalanDOMString&     origAttrName = origAttrNameGuard.get();

        assign(origAttrName, attrName);

        const XalanDOMString::size_type     origAttrNameLength = length(origAttrName);

        XalanDOMString::size_type           indexOfNSSep = 0;

        const GetCachedString   attrNameSpaceGuard(executionContext);

        XalanDOMString&     attrNameSpace = attrNameSpaceGuard.get();

        if(0 != m_namespaceAVT)
        {
            m_namespaceAVT->evaluate(attrNameSpace, *this, executionContext);

            indexOfNSSep = indexOf(origAttrName, XalanUnicode::charColon);

            if(attrNameSpace.empty())
            {
                // If there's no namespace, but the attribute has a
                // prefix, then we must strip the prefix off.
                if (indexOfNSSep < origAttrNameLength)
                {
                    substring(origAttrName, attrName, indexOfNSSep + 1);
                }

                // We set this to indicate that there is no prefix any
                // longer.
                indexOfNSSep = origAttrNameLength;
            }
            else
            {
                // See if the namespace already exists.  If it does, we'll get the
                // prefix that was used when it was declared.
                const XalanDOMString*  const    prefix =
                    executionContext.getResultPrefixForNamespace(attrNameSpace);

                // If there is already a prefix for the namespace, and it's length
                // is not 0, and there is no prefix on the attribute name, or
                // it's equal to the prefix on the attribute, then go ahead
                // and use that prefix.
                if(prefix != 0 &&
                   length(*prefix) != 0 &&
                   (indexOfNSSep == origAttrNameLength ||
                    equals(prefix->c_str(), attrName.c_str(), indexOfNSSep) == true))
                {
                    if(indexOfNSSep < origAttrNameLength)
                    {
                        reserve(
                            attrName,
                            length(attrName) - (indexOfNSSep + 1) + DOMServices::s_XMLNamespaceSeparatorStringLength + length(*prefix) + 1);

                        attrName.erase(0, indexOfNSSep + 1);
                    }
                    else
                    {
                        reserve(
                            attrName,
                            length(attrName) + DOMServices::s_XMLNamespaceSeparatorStringLength + length(*prefix) + 1);
                    }

                    insert(attrName, 0, DOMServices::s_XMLNamespaceSeparatorString);
                    insert(attrName, 0, *prefix);
                }
                else
                {
                    const GetCachedString   newPrefixGuard(executionContext);

                    XalanDOMString&     newPrefix = newPrefixGuard.get();

                    // If the prefix on the QName is xmlns, we cannot use it.
                    const bool          fPrefixIsXMLNS =
                        startsWith(origAttrName, DOMServices::s_XMLNamespaceWithSeparator);

                    // If there's a prefix, and it's not xmlns, then use
                    // the prefix that's provided.
                    if(indexOfNSSep < origAttrNameLength &&
                        fPrefixIsXMLNS == false)
                    {
                        substring(origAttrName, newPrefix, 0, indexOfNSSep);

                        // OK, make sure that the prefix provided maps to
                        // the same namespace as the one the user requested,
                        // and see if it's in use...
                        const XalanDOMString* const theNamespace =
                            executionContext.getResultNamespaceForPrefix(newPrefix);

                        if (theNamespace != 0 &&
                            equals(*theNamespace, attrNameSpace) == false &&
                            executionContext.isPendingResultPrefix(newPrefix) == true)
                        {
                            // It doesn't, so we'll need to manufacture a
                            // prefix.
                            clear(newPrefix);

                            // Strip the user-supplied prefix from the name...
                            substring(origAttrName, attrName, indexOfNSSep + 1);
                        }
                    }

                    if (length(newPrefix) == 0)
                    {
                        // If there's a prefix, and it's xmlns, then strip it
                        // off...
                        if (fPrefixIsXMLNS == true)
                        {
                            attrName.erase(0, indexOfNSSep + 1);
                        }

                        // Get a new, unique namespace prefix...
                        executionContext.getUniqueNamespaceValue(newPrefix);

                        // Reserve some space in the string.
                        reserve(
                            attrName,
                            length(attrName) + DOMServices::s_XMLNamespaceSeparatorStringLength + length(newPrefix) + 1);

                        insert(attrName, 0, DOMServices::s_XMLNamespaceSeparatorString);
                        insert(attrName, 0, newPrefix);
                    }

                    // OK, now we have to generate a namespace declaration...
                    const GetCachedString   nsDeclGuard(executionContext);

                    XalanDOMString&     nsDecl = nsDeclGuard.get();

                    reserve(nsDecl, DOMServices::s_XMLNamespaceWithSeparatorLength + length(newPrefix) + 1);

                    assign(nsDecl, DOMServices::s_XMLNamespaceWithSeparator);

                    append(nsDecl, newPrefix);

                    // Add the namespace declaration...
                    executionContext.addResultAttribute(nsDecl, attrNameSpace);
                }
            }
        }
      // Note we are using original attribute name for these tests. 
        else if(executionContext.isElementPending() == true &&
                !equals(origAttrName, DOMServices::s_XMLNamespace))
        {
            // Don't try to create a namespace declaration for anything that
            // starts with xml:
            if (startsWith(origAttrName, DOMServices::s_XMLString) == true)
            {
                // This just fakes out the test below.  It would be better if
                // we had a better way of testing this...
                indexOfNSSep = origAttrNameLength;
            }
            else
            {
                // make sure that if a prefix is specified on the attribute name, it is valid
                indexOfNSSep = indexOf(origAttrName, XalanUnicode::charColon);

                if(indexOfNSSep < origAttrNameLength)
                {
                    const GetCachedString   nsprefixGuard(executionContext);

                    XalanDOMString&     nsprefix = nsprefixGuard.get();

                    substring(origAttrName, nsprefix, 0, indexOfNSSep);

                    const XalanDOMString* const     theNamespace =
                        getNamespaceForPrefix(nsprefix);

                    if (theNamespace != 0)
                    {
                        assign(attrNameSpace, *theNamespace);

                        const XalanDOMString* const     theResultNamespace =
                            executionContext.getResultNamespaceForPrefix(nsprefix);

                        if (theResultNamespace != 0 &&
                            *theNamespace != *theResultNamespace)
                        {
                            // Oops! There's a conflict between an existing
                            // result namespace and the attribute's namespace.
                            // To be safe, because we are generating namespace
                            // declaration here, rather than somewhere that
                            // knows more about how that result namespace is
                            // used, let's change the prefix of the attribute.
                            nsprefix.clear();

                            executionContext.getUniqueNamespaceValue(nsprefix);

                            // Fix the name by removing the original prefix and
                            // inserting the new one.
                            attrName.erase(0, indexOfNSSep);
                            attrName.insert(attrName.begin(), nsprefix.begin(), nsprefix.end());
                        }
                    }

                    if (attrNameSpace.empty())
                    {
                        // Could not resolve prefix
                        warn(
                            executionContext,
                            XalanMessages::PrefixIsNotDeclared_1Param,
                            nsprefix);
                    }
                    else
                    {
                        // Check to see if there's already a namespace declaration in scope...
                        const XalanDOMString* const     prefix =
                            executionContext.getResultPrefixForNamespace(attrNameSpace);

                        if (prefix == 0)
                        {
                            // We need to generate a namespace declaration...
                            const GetCachedString   nsDeclGuard(executionContext);

                            XalanDOMString&     nsDecl = nsDeclGuard.get();

                            reserve(nsDecl, DOMServices::s_XMLNamespaceWithSeparatorLength + length(nsprefix) + 1);

                            assign(nsDecl, DOMServices::s_XMLNamespaceWithSeparator);

                            append(nsDecl, nsprefix);

                            // Add the namespace declaration...
                            executionContext.addResultAttribute(nsDecl, attrNameSpace);
                        }
                    }
                }
            }
        }
        else
        {
            warn(
                executionContext,
                XalanMessages::AttributesCannotBeAdded);
        }

        // If there was no namespace, or the namespace was resolved, process
        // the result attribute.
        if (indexOfNSSep == origAttrNameLength || !attrNameSpace.empty())
        {
            StylesheetExecutionContext::SetAndRestoreCopyTextNodesOnly  theSetAndRestore(executionContext, true);

            childrenToResultAttribute(
                executionContext,
                attrName);
        }
    }
}
#endif



bool
ElemAttribute::childTypeAllowed(int     xslToken) const
{
    bool    fResult = false;

    switch(xslToken)
    {
        // char-instructions 
    case StylesheetConstructionContext::ELEMNAME_TEXT_LITERAL_RESULT:
    case StylesheetConstructionContext::ELEMNAME_APPLY_TEMPLATES:
    case StylesheetConstructionContext::ELEMNAME_APPLY_IMPORTS:
    case StylesheetConstructionContext::ELEMNAME_CALL_TEMPLATE:
    case StylesheetConstructionContext::ELEMNAME_FOR_EACH:
    case StylesheetConstructionContext::ELEMNAME_VALUE_OF:
    case StylesheetConstructionContext::ELEMNAME_COPY_OF:
    case StylesheetConstructionContext::ELEMNAME_NUMBER:
    case StylesheetConstructionContext::ELEMNAME_CHOOSE:
    case StylesheetConstructionContext::ELEMNAME_IF:
    case StylesheetConstructionContext::ELEMNAME_TEXT:
    case StylesheetConstructionContext::ELEMNAME_COPY:
    case StylesheetConstructionContext::ELEMNAME_VARIABLE:
    case StylesheetConstructionContext::ELEMNAME_MESSAGE:
        fResult = true;
        break;

    default:
        break;
    }

    return fResult;
}



}