72 lines
2.5 KiB
C#
72 lines
2.5 KiB
C#
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 changes the scope to the object passed as an argument.
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/// </summary>
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internal sealed class WithTagDefinition : ContentTagDefinition
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{
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private const string contextParameter = "context";
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private static readonly TagParameter context = new TagParameter(contextParameter) { IsRequired = true };
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/// <summary>
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/// Initializes a new instance of a WithTagDefinition.
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/// </summary>
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public WithTagDefinition()
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: base("with", 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[] { context };
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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[] { context };
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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="keyScope">The current key 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(
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TextWriter writer,
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Scope keyScope,
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Dictionary<string, object> arguments,
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Scope contextScope)
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{
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object contextSource = arguments[contextParameter];
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NestedContext context = new NestedContext()
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{
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KeyScope = keyScope.CreateChildScope(contextSource),
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Writer = writer,
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ContextScope = contextScope.CreateChildScope()
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};
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yield return context;
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}
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}
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}
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