82 lines
2.8 KiB
C#
82 lines
2.8 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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namespace mustache
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{
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/// <summary>
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/// Defines a tag that can iterate over a collection of items and render
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/// the content using each item as the context.
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/// </summary>
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internal sealed class EachTagDefinition : ContentTagDefinition
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{
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private const string collectionParameter = "collection";
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private static readonly TagParameter collection = new TagParameter(collectionParameter) { IsRequired = true };
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/// <summary>
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/// Initializes a new instance of an EachTagDefinition.
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/// </summary>
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public EachTagDefinition()
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: base("each", true)
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{
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}
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/// <summary>
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/// Gets whether the tag only exists within the scope of its parent.
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/// </summary>
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protected override bool GetIsContextSensitive()
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{
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return false;
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}
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/// <summary>
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/// Gets the parameters that can be passed to the tag.
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/// </summary>
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/// <returns>The parameters.</returns>
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protected override IEnumerable<TagParameter> GetParameters()
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{
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return new TagParameter[] { collection };
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}
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/// <summary>
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/// Gets the context to use when building the inner text of the tag.
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/// </summary>
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/// <param name="writer">The text writer passed</param>
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/// <param name="scope">The current scope.</param>
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/// <param name="arguments">The arguments passed to the tag.</param>
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/// <returns>The scope to use when building the inner text of the tag.</returns>
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public override IEnumerable<NestedContext> GetChildContext(TextWriter writer, KeyScope scope, Dictionary<string, object> arguments)
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{
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object value = arguments[collectionParameter];
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IEnumerable enumerable = value as IEnumerable;
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if (enumerable == null)
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{
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yield break;
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}
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foreach (object item in enumerable)
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{
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yield return new NestedContext() { KeyScope = scope.CreateChildScope(item), Writer = writer };
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}
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}
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/// <summary>
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/// Gets the tags that are in scope under this tag.
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/// </summary>
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/// <returns>The name of the tags that are in scope.</returns>
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protected override IEnumerable<string> GetChildTags()
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{
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return new string[] { };
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}
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/// <summary>
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/// Gets the parameters that are used to create a new child context.
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/// </summary>
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/// <returns>The parameters that are used to create a new child context.</returns>
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public override IEnumerable<TagParameter> GetChildContextParameters()
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{
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return new TagParameter[] { collection };
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}
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}
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}
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