74 lines
2.1 KiB
C#
74 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading;
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using FluentValidation;
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using HandlebarsDotNet;
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using MfGames.Gallium;
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using MfGames.Nitride.Contents;
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using MfGames.Nitride.Generators;
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namespace MfGames.Nitride.Handlebars;
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/// <summary>
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/// An operation that applies a common or shared template on the content of
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/// a document that includes theme or styling information.
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/// </summary>
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[WithProperties]
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public partial class ApplyStyleTemplate : OperationBase
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{
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private readonly HandlebarsTemplateCache cache;
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private readonly IValidator<ApplyStyleTemplate> validator;
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public ApplyStyleTemplate(
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IValidator<ApplyStyleTemplate> validator,
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HandlebarsTemplateCache cache)
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{
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this.validator = validator;
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this.cache = cache;
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}
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/// <summary>
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/// Gets or sets the callback used to create a model from a given
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/// entity. This allows for the website to customize what information is
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/// being passed to the template.
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/// </summary>
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public Func<Entity, object>? CreateModelCallback { get; set; }
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/// <summary>
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/// Gets or sets the callback used to determine which template to use
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/// for a given entity. This lets one have a per-page template change.
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/// </summary>
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public Func<Entity, string>? GetTemplateName { get; set; }
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public IHandlebars? Handlebars { get; set; }
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/// <inheritdoc />
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public override IEnumerable<Entity> Run(
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IEnumerable<Entity> input,
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CancellationToken cancellationToken = default)
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{
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// Make sure we have sane data.
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this.validator.ValidateAndThrow(this);
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// Create and set up the Handlebars.
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return input.SelectEntity<ITextContent>(this.Apply);
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}
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private Entity Apply(
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Entity entity,
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ITextContent content)
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{
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object model = this.CreateModelCallback!(entity);
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string name = this.GetTemplateName!(entity);
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HandlebarsTemplate<object, object> template =
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this.cache.GetNamedTemplate(name);
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string result = template(model!);
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return entity.SetTextContent(result);
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}
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}
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