118 lines
4.3 KiB
C#
118 lines
4.3 KiB
C#
// Copyright (c) 2012, 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 ForStatement : Statement
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{
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string indexIdentifier;
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Expression startIndex;
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Expression endIndex;
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List<Statement> statements = new List<Statement>();
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public ForStatement(int line, int column)
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: base(line, column)
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{
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}
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public string IndexIdentifier
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{
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get { return indexIdentifier; }
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set { indexIdentifier = value; }
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}
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public Expression StartIndex
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{
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get { return startIndex; }
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set { startIndex = value; }
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}
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public Expression EndIndex
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{
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get { return endIndex; }
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set { endIndex = value; }
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}
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public List<Statement> Statements
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{
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get { return statements; }
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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 indicies
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object objStartIdx = StartIndex.Eval(context);
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object objEndIdx = EndIndex.Eval(context);
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// check indicies
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if (!(objStartIdx is Int32))
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throw new ParserException("Start index expression should evaluate to integer.", StartIndex.Line, StartIndex.Column);
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if (!(objEndIdx is Int32))
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throw new ParserException("End index expression should evaluate to integer.", StartIndex.Line, StartIndex.Column);
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int startIdx = Convert.ToInt32(objStartIdx);
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int endIdx = Convert.ToInt32(objEndIdx);
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int step = startIdx < endIdx ? 1 : -1;
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endIdx += step;
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int i = startIdx;
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do
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{
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context.Variables[IndexIdentifier] = i;
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// evaluate statements
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foreach (Statement stm in Statements)
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stm.Eval(context, writer);
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i += step;
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}
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while (i != endIdx);
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// cleanup vars
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context.Variables.Remove(IndexIdentifier);
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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("{for ")
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.Append(IndexIdentifier).Append(" = ")
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.Append(StartIndex).Append(" to ").Append(EndIndex).Append("}");
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foreach (Statement stm in Statements)
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{
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sb.Append(stm);
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}
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sb.Append("{/for}");
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return sb.ToString();
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}
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}
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}
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