112 lines
4.2 KiB
C#
112 lines
4.2 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;
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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 ForeachStatement : Statement
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{
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string elementIdentifier;
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string indexIdentifier;
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Expression collection;
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List<Statement> statements = new List<Statement>();
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public ForeachStatement(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 ElementIdentifier
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{
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get { return elementIdentifier; }
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set { elementIdentifier = value; }
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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 Collection
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{
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get { return collection; }
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set { collection = 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 collection expression
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object coll = Collection.Eval(context);
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if(!(coll is IEnumerable))
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throw new ParserException("Collection expression should evaluate into the value implementing IEnumerable interface.",
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Collection.Line, Collection.Column);
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int idx = 0;
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foreach(object obj in ((IEnumerable)coll))
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{
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context.Variables[ElementIdentifier] = obj;
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if(IndexIdentifier != null)
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context.Variables[IndexIdentifier] = idx;
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idx++;
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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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}
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// cleanup context
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context.Variables.Remove(ElementIdentifier);
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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("{foreach ")
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.Append(ElementIdentifier).Append(" in ").Append(Collection);
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if (IndexIdentifier != null)
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sb.Append(" index ").Append(IndexIdentifier);
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sb.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("{/foreach}");
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return sb.ToString();
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}
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}
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}
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