VariableAction.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / XsltOld / VariableAction.cs / 1305376 / VariableAction.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System.Diagnostics; 
using System.Xml.XPath;
 
namespace System.Xml.Xsl.XsltOld {
    using Res = System.Xml.Utils.Res;

    internal enum VariableType { 
        GlobalVariable,
        GlobalParameter, 
        LocalVariable, 
        LocalParameter,
        WithParameter, 
    }

    internal class VariableAction : ContainerAction, IXsltContextVariable {
        public static object BeingComputedMark = new object(); 
        private const int ValueCalculated = 2;
 
        protected XmlQualifiedName  name; 
        protected string            nameStr;
        protected string            baseUri; 
        protected int               selectKey = Compiler.InvalidQueryKey;
        protected int               stylesheetid;
        protected VariableType      varType;
        private   int               varKey; 

        internal int Stylesheetid { 
            get { return this.stylesheetid; } 
        }
        internal XmlQualifiedName Name { 
            get { return this.name; }
        }
        internal string NameStr {
            get { return this.nameStr; } 
        }
        internal VariableType VarType { 
            get { return this.varType; } 
        }
        internal int VarKey { 
            get { return this.varKey; }
        }
        internal bool IsGlobal {
            get { return this.varType == VariableType.GlobalVariable || this.varType == VariableType.GlobalParameter; } 
        }
 
        internal VariableAction(VariableType type) { 
            this.varType = type;
        } 

        internal override void Compile(Compiler compiler) {
            this.stylesheetid = compiler.Stylesheetid;
            this.baseUri      = compiler.Input.BaseURI; 
            CompileAttributes(compiler);
            CheckRequiredAttribute(compiler, this.name, "name"); 
 

            if (compiler.Recurse()) { 
                CompileTemplate(compiler);
                compiler.ToParent();

                if (this.selectKey != Compiler.InvalidQueryKey && this.containedActions != null) { 
                    throw XsltException.Create(Res.Xslt_VariableCntSel2, this.nameStr);
                } 
            } 
            if (this.containedActions != null) {
                baseUri = baseUri + '#' + compiler.GetUnicRtfId(); 
            } else {
                baseUri = null;
            }
 
            this.varKey = compiler.InsertVariable(this);
        } 
 
        internal override bool CompileAttribute(Compiler compiler) {
            string name   = compiler.Input.LocalName; 
            string value  = compiler.Input.Value;

            if (Ref.Equal(name, compiler.Atoms.Name)) {
                Debug.Assert(this.name == null && this.nameStr == null); 
                this.nameStr = value;
                this.name    = compiler.CreateXPathQName(this.nameStr); 
            } 
            else if (Ref.Equal(name, compiler.Atoms.Select)) {
                this.selectKey = compiler.AddQuery(value); 
            }
            else {
                return false;
            } 

            return true; 
        } 

        internal override void Execute(Processor processor, ActionFrame frame) { 
            Debug.Assert(processor != null && frame != null && frame.State != ValueCalculated);
            object value = null;

            switch(frame.State) { 
            case Initialized:
                if (IsGlobal) { 
                    if (frame.GetVariable(this.varKey) != null) { // This var was calculated already 
                        frame.Finished();
                        break; 
                    }
                    // Mark that the variable is being computed to check for circular references
                    frame.SetVariable(this.varKey, BeingComputedMark);
                } 
                // If this is a parameter, check whether the caller has passed the value
                if (this.varType == VariableType.GlobalParameter) { 
                    value = processor.GetGlobalParameter(this.name); 
                } else if (this.varType == VariableType.LocalParameter) {
                    value = processor.GetParameter(this.name); 
                }
                if (value != null) {
                    goto case ValueCalculated;
                } 

                // If value was not passed, check the 'select' attribute 
                if (this.selectKey != Compiler.InvalidQueryKey) { 
                    value = processor.RunQuery(frame, this.selectKey);
                    goto case ValueCalculated; 
                }

                // If there is no 'select' attribute and the content is empty, use the empty string
                if (this.containedActions == null) { 
                    value = string.Empty;
                    goto case ValueCalculated; 
                } 

                // RTF case 
                NavigatorOutput output = new NavigatorOutput(this.baseUri);
                processor.PushOutput(output);
                processor.PushActionFrame(frame);
                frame.State = ProcessingChildren; 
                break;
 
            case ProcessingChildren: 
                RecordOutput recOutput = processor.PopOutput();
                Debug.Assert(recOutput is NavigatorOutput); 
                value = ((NavigatorOutput)recOutput).Navigator;
                goto case ValueCalculated;

            case ValueCalculated: 
                Debug.Assert(value != null);
                frame.SetVariable(this.varKey, value); 
                frame.Finished(); 
                break;
 
            default:
                Debug.Fail("Invalid execution state inside VariableAction.Execute");
    		    break;
            } 
        }
 
        // ---------------------- IXsltContextVariable -------------------- 

        XPathResultType IXsltContextVariable.VariableType { 
            get { return XPathResultType.Any; }
        }
        object IXsltContextVariable.Evaluate(XsltContext xsltContext) {
            return ((XsltCompileContext)xsltContext).EvaluateVariable(this); 
        }
        bool   IXsltContextVariable.IsLocal { 
            get { return this.varType == VariableType.LocalVariable  || this.varType == VariableType.LocalParameter;  } 
        }
        bool   IXsltContextVariable.IsParam { 
            get { return this.varType == VariableType.LocalParameter || this.varType == VariableType.GlobalParameter; }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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VariableAction.cs source code in C# .NET

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