101 lines
3.4 KiB
C#
101 lines
3.4 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.Linq;
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namespace Mustache
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{
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/// <summary>
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/// Defines a tag that conditionally prints its content.
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/// </summary>
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internal abstract class ConditionTagDefinition : ContentTagDefinition
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{
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private const string conditionParameter = "condition";
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/// <summary>
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/// Initializes a new instance of a ConditionTagDefinition.
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/// </summary>
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/// <param name="tagName">The name of the tag.</param>
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protected ConditionTagDefinition(string tagName)
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: base(tagName, true)
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{
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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[] { new TagParameter(conditionParameter) { IsRequired = true } };
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}
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/// <summary>
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/// Gets the tags that come into scope within the context of the current tag.
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/// </summary>
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/// <returns>The child tag definitions.</returns>
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protected override IEnumerable<string> GetChildTags()
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{
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return new string[] { "elif", "else" };
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}
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/// <summary>
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/// Gets whether the given tag's generator should be used for a secondary (or substitute) text block.
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/// </summary>
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/// <param name="definition">The tag to inspect.</param>
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/// <returns>True if the tag's generator should be used as a secondary generator.</returns>
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public override bool ShouldCreateSecondaryGroup(TagDefinition definition)
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{
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return new string[] { "elif", "else" }.Contains(definition.Name);
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}
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/// <summary>
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/// Gets whether the primary generator group should be used to render the tag.
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/// </summary>
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/// <param name="arguments">The arguments passed to the tag.</param>
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/// <returns>
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/// True if the primary generator group should be used to render the tag;
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/// otherwise, false to use the secondary group.
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/// </returns>
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public override bool ShouldGeneratePrimaryGroup(Dictionary<string, object> arguments)
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{
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object condition = arguments[conditionParameter];
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return isConditionSatisfied(condition);
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}
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private bool isConditionSatisfied(object condition)
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{
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if (condition == null || condition == DBNull.Value)
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{
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return false;
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}
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if (condition is IEnumerable enumerable)
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{
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return enumerable.Cast<object>().Any();
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}
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if (condition is Char)
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{
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return (Char)condition != '\0';
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}
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try
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{
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decimal number = (decimal)Convert.ChangeType(condition, typeof(decimal));
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return number != 0.0m;
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}
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catch
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{
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return true;
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}
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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[0];
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}
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}
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}
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