Initial project's source code check-in.

WebsitePanel/Sources/WebsitePanel.Templates/AST/ForeachStatement.cs

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+// Copyright (c) 2011, Outercurve Foundation.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must  retain  the  above copyright notice, this
+//   list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form  must  reproduce the  above  copyright  notice,
+//   this list of conditions  and  the  following  disclaimer in  the documentation
+//   and/or other materials provided with the distribution.
+//
+// - Neither  the  name  of  the  Outercurve Foundation  nor   the   names  of  its
+//   contributors may be used to endorse or  promote  products  derived  from  this
+//   software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,  BUT  NOT  LIMITED TO, THE IMPLIED
+// WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR  PURPOSE  ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+// ANY DIRECT, INDIRECT, INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER  CAUSED AND ON
+// ANY  THEORY  OF  LIABILITY,  WHETHER  IN  CONTRACT,  STRICT  LIABILITY,  OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING  IN  ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+
+namespace WebsitePanel.Templates.AST
+{
+    internal class ForeachStatement : Statement
+    {
+        string elementIdentifier;
+        string indexIdentifier;
+        Expression collection;
+        List<Statement> statements = new List<Statement>();
+
+        public ForeachStatement(int line, int column)
+            : base(line, column)
+        {
+        }
+
+        public string ElementIdentifier
+        {
+            get { return elementIdentifier; }
+            set { elementIdentifier = value; }
+        }
+
+        public string IndexIdentifier
+        {
+            get { return indexIdentifier; }
+            set { indexIdentifier = value; }
+        }
+
+        public Expression Collection
+        {
+            get { return collection; }
+            set { collection = value; }
+        }
+
+        public List<Statement> Statements
+        {
+            get { return statements; }
+        }
+
+        public override void Eval(TemplateContext context, System.IO.StringWriter writer)
+        {
+            // evaluate collection expression
+            object coll = Collection.Eval(context);
+            if(!(coll is IEnumerable))
+                throw new ParserException("Collection expression should evaluate into the value implementing IEnumerable interface.",
+                    Collection.Line, Collection.Column);
+
+            int idx = 0;
+            foreach(object obj in ((IEnumerable)coll))
+            {
+                context.Variables[ElementIdentifier] = obj;
+                if(IndexIdentifier != null)
+                    context.Variables[IndexIdentifier] = idx;
+                idx++;
+
+                // evaluate statements
+                foreach(Statement stm in Statements)
+                    stm.Eval(context, writer);
+            }
+
+            // cleanup context
+            context.Variables.Remove(ElementIdentifier);
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append("{foreach ")
+                .Append(ElementIdentifier).Append(" in ").Append(Collection);
+            if (IndexIdentifier != null)
+                sb.Append(" index ").Append(IndexIdentifier);
+            sb.Append("}");
+            foreach (Statement stm in Statements)
+            {
+                sb.Append(stm);
+            }
+            sb.Append("{/foreach}");
+            return sb.ToString();
+        }
+    }
+}