Initial project's source code check-in.

WebsitePanel/Sources/WebsitePanel.Templates/AST/IfStatement.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 IfStatement : Statement
+    {
+        Expression condition;
+        List<ElseIfStatement> elseIfStatements = new List<ElseIfStatement>();
+        List<Statement> trueStatements = new List<Statement>();
+        List<Statement> falseStatements = new List<Statement>();
+
+        public IfStatement(int line, int column)
+            : base(line, column)
+        {
+        }
+
+        public Expression Condition
+        {
+            get { return condition; }
+            set { condition = value; }
+        }
+
+        public List<ElseIfStatement> ElseIfStatements
+        {
+            get { return elseIfStatements; }
+        }
+
+        public List<Statement> TrueStatements
+        {
+            get { return trueStatements; }
+        }
+
+        public List<Statement> FalseStatements
+        {
+            get { return falseStatements; }
+        }
+
+        public override void Eval(TemplateContext context, System.IO.StringWriter writer)
+        {
+            // evaluate test condition
+            bool result = EvalCondition(Condition, context);
+
+            if (result)
+            {
+                foreach (Statement stm in TrueStatements)
+                    stm.Eval(context, writer);
+                return;
+            }
+            else
+            {
+                // process else if statements
+                foreach (ElseIfStatement stm in ElseIfStatements)
+                {
+                    if (EvalCondition(stm.Condition, context))
+                    {
+                        stm.Eval(context, writer);
+                        return;
+                    }
+                }
+
+                // process else
+                foreach (Statement stm in FalseStatements)
+                    stm.Eval(context, writer);
+            }
+        }
+
+        private bool EvalCondition(Expression expr, TemplateContext context)
+        {
+            object val = expr.Eval(context);
+            if (val is Boolean)
+                return (Boolean)val;
+            else if (val is Int32)
+                return ((Int32)val) != 0;
+            else if (val is Decimal)
+                return ((Decimal)val) != 0;
+            else if (val != null)
+                return true;
+            else
+                return false;
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append("{if ")
+                .Append(Condition.ToString()).Append("}");
+
+            // true statements
+            foreach (Statement stm in TrueStatements)
+                sb.Append(stm);
+
+            // elseif statements
+            foreach (Statement stm in ElseIfStatements)
+                sb.Append(stm);
+
+            // false statements
+            if(FalseStatements.Count > 0)
+            {
+                sb.Append("{else}");
+                foreach (Statement stm in FalseStatements)
+                    sb.Append(stm);
+            }
+
+            sb.Append("{/if}");
+            return sb.ToString();
+        }
+    }
+}