Initial project's source code check-in.

WebsitePanel/Sources/WebsitePanel.Templates/AST/ForStatement.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.Generic;
+using System.Text;
+
+namespace WebsitePanel.Templates.AST
+{
+    internal class ForStatement : Statement
+    {
+        string indexIdentifier;
+        Expression startIndex;
+        Expression endIndex;
+        List<Statement> statements = new List<Statement>();
+
+        public ForStatement(int line, int column)
+            : base(line, column)
+        {
+        }
+
+        public string IndexIdentifier
+        {
+            get { return indexIdentifier; }
+            set { indexIdentifier = value; }
+        }
+
+        public Expression StartIndex
+        {
+            get { return startIndex; }
+            set { startIndex = value; }
+        }
+
+        public Expression EndIndex
+        {
+            get { return endIndex; }
+            set { endIndex = value; }
+        }
+
+        public List<Statement> Statements
+        {
+            get { return statements; }
+        }
+
+        public override void Eval(TemplateContext context, System.IO.StringWriter writer)
+        {
+            // evaluate indicies
+            object objStartIdx = StartIndex.Eval(context);
+            object objEndIdx = EndIndex.Eval(context);
+
+            // check indicies
+            if (!(objStartIdx is Int32))
+                throw new ParserException("Start index expression should evaluate to integer.", StartIndex.Line, StartIndex.Column);
+            if (!(objEndIdx is Int32))
+                throw new ParserException("End index expression should evaluate to integer.", StartIndex.Line, StartIndex.Column);
+
+            int startIdx = Convert.ToInt32(objStartIdx);
+            int endIdx = Convert.ToInt32(objEndIdx);
+            int step = startIdx < endIdx ? 1 : -1;
+            endIdx += step;
+
+            int i = startIdx;
+            do
+            {
+                context.Variables[IndexIdentifier] = i;
+
+                // evaluate statements
+                foreach (Statement stm in Statements)
+                    stm.Eval(context, writer);
+
+                i += step;
+            }
+            while (i != endIdx);
+
+            // cleanup vars
+            context.Variables.Remove(IndexIdentifier);
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append("{for ")
+                .Append(IndexIdentifier).Append(" = ")
+                .Append(StartIndex).Append(" to ").Append(EndIndex).Append("}");
+            foreach (Statement stm in Statements)
+            {
+                sb.Append(stm);
+            }
+            sb.Append("{/for}");
+            return sb.ToString();
+        }
+    }
+}