Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Xslt / InvokeGenerator.cs / 1305376 / InvokeGenerator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Collections.Generic; using System.Diagnostics; using System.Xml.Xsl.Qil; namespace System.Xml.Xsl.Xslt { using T = XmlQueryTypeFactory; /** InvokeGenerator is one of the trikest peaces here. ARGS: QilFunction func -- Functions which should be invoked. Arguments of this function (formalArgs) are Let nodes anotated with names and default valies. Problem 1 is that default values can contain references to previouse args of this function. Problem 2 is that default values shouldn't contain fixup nodes. ArrayList actualArgs -- Array of QilNodes anotated with names. When name of formalArg match name actualArg last one is used as invokeArg, otherwise formalArg's default value is cloned and used. **/ internal class InvokeGenerator : QilCloneVisitor { private bool debug; private StackiterStack; private QilList formalArgs; private QilList invokeArgs; private int curArg; // this.Clone() depends on this value private XsltQilFactory fac; public InvokeGenerator(XsltQilFactory f, bool debug) : base(f.BaseFactory) { this.debug = debug; this.fac = f; this.iterStack = new Stack (); } public QilNode GenerateInvoke(QilFunction func, IList actualArgs) { iterStack.Clear(); formalArgs = func.Arguments; invokeArgs = fac.ActualParameterList(); // curArg is an instance variable used in Clone() method for (curArg = 0; curArg < formalArgs.Count; curArg ++) { // Find actual value for a given formal arg QilParameter formalArg = (QilParameter)formalArgs[curArg]; QilNode invokeArg = FindActualArg(formalArg, actualArgs); // If actual value was not specified, use the default value and copy its debug comment if (invokeArg == null) { if (debug) { if (formalArg.Name.NamespaceUri == XmlReservedNs.NsXslDebug) { Debug.Assert(formalArg.Name.LocalName == "namespaces", "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs()"); Debug.Assert(formalArg.DefaultValue != null, "PrecompileProtoTemplatesHeaders() set it"); invokeArg = Clone(formalArg.DefaultValue); } else { invokeArg = fac.DefaultValueMarker(); } } else { Debug.Assert(formalArg.Name.NamespaceUri != XmlReservedNs.NsXslDebug, "Cur,Pos,Last don't have default values and should be always added to by caller in AddImplicitArgs(). We don't have $namespaces in !debug."); invokeArg = Clone(formalArg.DefaultValue); } } XmlQueryType formalType = formalArg.XmlType; XmlQueryType invokeType = invokeArg.XmlType; // Possible arg types: anyType, node-set, string, boolean, and number fac.CheckXsltType(formalArg); fac.CheckXsltType(invokeArg); if (!invokeType.IsSubtypeOf(formalType)) { // This may occur only if inferred type of invokeArg is XslFlags.None Debug.Assert(invokeType == T.ItemS, "Actual argument type is not a subtype of formal argument type"); invokeArg = fac.TypeAssert(invokeArg, formalType); } invokeArgs.Add(invokeArg); } // Create Invoke node and wrap it with previous parameter declarations QilNode invoke = fac.Invoke(func, invokeArgs); while (iterStack.Count != 0) invoke = fac.Loop(iterStack.Pop(), invoke); return invoke; } private QilNode FindActualArg(QilParameter formalArg, IList actualArgs) { QilName argName = formalArg.Name; Debug.Assert(argName != null); foreach (XslNode actualArg in actualArgs) { if (actualArg.Name.Equals(argName)) { return ((VarPar)actualArg).Value; } } return null; } // ------------------------------------ QilCloneVisitor ------------------------------------- protected override QilNode VisitReference(QilNode n) { QilNode replacement = FindClonedReference(n); // If the reference is internal for the subtree being cloned, return it as is if (replacement != null) { return replacement; } // Replacement was not found, thus the reference is external for the subtree being cloned. // The case when it refers to one of previous arguments (xsl:param can refer to previous // xsl:param's) must be taken care of. for (int prevArg = 0; prevArg < curArg; prevArg++) { Debug.Assert(formalArgs[prevArg] != null, "formalArg must be in the list"); Debug.Assert(invokeArgs[prevArg] != null, "This arg should be compiled already"); // Is this a reference to prevArg? if (n == formalArgs[prevArg]) { // If prevArg is a literal, just clone it if (invokeArgs[prevArg] is QilLiteral) { return invokeArgs[prevArg].ShallowClone(fac.BaseFactory); } // If prevArg is not an iterator, cache it in an iterator, and return it if (!(invokeArgs[prevArg] is QilIterator)) { QilIterator var = fac.BaseFactory.Let(invokeArgs[prevArg]); iterStack.Push(var); invokeArgs[prevArg] = var; } Debug.Assert(invokeArgs[prevArg] is QilIterator); return invokeArgs[prevArg]; } } // This is a truly external reference, return it as is return n; } protected override QilNode VisitFunction(QilFunction n) { // No need to change function references return n; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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