138 lines
4.8 KiB
C#
138 lines
4.8 KiB
C#
// Copyright (c) 2011, Outercurve Foundation.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// - Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// - Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// - Neither the name of the Outercurve Foundation nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace WebsitePanel.Templates.AST
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{
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internal class IfStatement : Statement
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{
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Expression condition;
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List<ElseIfStatement> elseIfStatements = new List<ElseIfStatement>();
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List<Statement> trueStatements = new List<Statement>();
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List<Statement> falseStatements = new List<Statement>();
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public IfStatement(int line, int column)
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: base(line, column)
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{
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}
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public Expression Condition
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{
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get { return condition; }
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set { condition = value; }
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}
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public List<ElseIfStatement> ElseIfStatements
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{
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get { return elseIfStatements; }
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}
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public List<Statement> TrueStatements
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{
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get { return trueStatements; }
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}
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public List<Statement> FalseStatements
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{
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get { return falseStatements; }
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}
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public override void Eval(TemplateContext context, System.IO.StringWriter writer)
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{
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// evaluate test condition
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bool result = EvalCondition(Condition, context);
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if (result)
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{
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foreach (Statement stm in TrueStatements)
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stm.Eval(context, writer);
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return;
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}
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else
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{
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// process else if statements
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foreach (ElseIfStatement stm in ElseIfStatements)
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{
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if (EvalCondition(stm.Condition, context))
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{
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stm.Eval(context, writer);
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return;
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}
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}
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// process else
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foreach (Statement stm in FalseStatements)
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stm.Eval(context, writer);
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}
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}
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private bool EvalCondition(Expression expr, TemplateContext context)
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{
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object val = expr.Eval(context);
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if (val is Boolean)
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return (Boolean)val;
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else if (val is Int32)
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return ((Int32)val) != 0;
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else if (val is Decimal)
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return ((Decimal)val) != 0;
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else if (val != null)
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return true;
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else
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return false;
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}
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public override string ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("{if ")
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.Append(Condition.ToString()).Append("}");
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// true statements
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foreach (Statement stm in TrueStatements)
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sb.Append(stm);
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// elseif statements
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foreach (Statement stm in ElseIfStatements)
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sb.Append(stm);
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// false statements
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if(FalseStatements.Count > 0)
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{
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sb.Append("{else}");
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foreach (Statement stm in FalseStatements)
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sb.Append(stm);
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}
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sb.Append("{/if}");
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return sb.ToString();
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}
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}
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}
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