MustacheSharp/mustache-sharp/WithTagDefinition.cs

73 lines
2.5 KiB
C#

using System;
using System.Collections.Generic;
using System.IO;
namespace Mustache
{
/// <summary>
/// Defines a tag that changes the scope to the object passed as an argument.
/// </summary>
internal sealed class WithTagDefinition : ContentTagDefinition
{
private const string contextParameter = "context";
private static readonly TagParameter context = new TagParameter(contextParameter) { IsRequired = true };
/// <summary>
/// Initializes a new instance of a WithTagDefinition.
/// </summary>
public WithTagDefinition()
: base("with", true)
{
}
/// <summary>
/// Gets whether the tag only exists within the scope of its parent.
/// </summary>
protected override bool GetIsContextSensitive()
{
return false;
}
/// <summary>
/// Gets the parameters that can be passed to the tag.
/// </summary>
/// <returns>The parameters.</returns>
protected override IEnumerable<TagParameter> GetParameters()
{
return new TagParameter[] { context };
}
/// <summary>
/// Gets the parameters that are used to create a new child context.
/// </summary>
/// <returns>The parameters that are used to create a new child context.</returns>
public override IEnumerable<TagParameter> GetChildContextParameters()
{
return new TagParameter[] { context };
}
/// <summary>
/// Gets the context to use when building the inner text of the tag.
/// </summary>
/// <param name="writer">The text writer passed</param>
/// <param name="keyScope">The current key scope.</param>
/// <param name="arguments">The arguments passed to the tag.</param>
/// <returns>The scope to use when building the inner text of the tag.</returns>
public override IEnumerable<NestedContext> GetChildContext(
TextWriter writer,
Scope keyScope,
Dictionary<string, object> arguments,
Scope contextScope)
{
object contextSource = arguments[contextParameter];
NestedContext context = new NestedContext()
{
KeyScope = keyScope.CreateChildScope(contextSource),
Writer = writer,
ContextScope = contextScope.CreateChildScope()
};
yield return context;
}
}
}