119 lines
4.4 KiB
C#
119 lines
4.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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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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/// Generates text by substituting an object's values for placeholders.
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/// </summary>
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public sealed class Generator
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{
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private readonly IGenerator _generator;
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private readonly List<EventHandler<KeyFoundEventArgs>> _foundHandlers = new List<EventHandler<KeyFoundEventArgs>>();
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private readonly List<EventHandler<KeyNotFoundEventArgs>> _notFoundHandlers = new List<EventHandler<KeyNotFoundEventArgs>>();
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private readonly List<EventHandler<ValueRequestEventArgs>> _valueRequestedHandlers = new List<EventHandler<ValueRequestEventArgs>>();
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/// <summary>
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/// Initializes a new instance of a Generator.
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/// </summary>
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/// <param name="generator">The text generator to wrap.</param>
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internal Generator(IGenerator generator)
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{
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_generator = generator;
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}
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/// <summary>
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/// Occurs when a key/property is found.
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/// </summary>
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public event EventHandler<KeyFoundEventArgs> KeyFound
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{
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add { _foundHandlers.Add(value); }
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remove { _foundHandlers.Remove(value); }
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}
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/// <summary>
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/// Occurs when a key/property is not found in the object graph.
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/// </summary>
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public event EventHandler<KeyNotFoundEventArgs> KeyNotFound
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{
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add { _notFoundHandlers.Add(value); }
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remove { _notFoundHandlers.Remove(value); }
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}
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/// <summary>
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/// Occurs when a setter is encountered and requires a value to be provided.
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/// </summary>
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public event EventHandler<ValueRequestEventArgs> ValueRequested
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{
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add { _valueRequestedHandlers.Add(value); }
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remove { _valueRequestedHandlers.Remove(value); }
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}
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/// <summary>
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/// Occurs when a tag is replaced by its text.
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/// </summary>
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public event EventHandler<TagFormattedEventArgs> TagFormatted;
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/// <summary>
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/// Gets the text that is generated for the given object.
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/// </summary>
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/// <param name="source">The object to generate the text with.</param>
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/// <returns>The text generated for the given object.</returns>
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public string Render(object source)
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{
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return render(CultureInfo.CurrentCulture, source);
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}
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/// <summary>
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/// Gets the text that is generated for the given object.
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/// </summary>
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/// <param name="provider">The format provider to use.</param>
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/// <param name="source">The object to generate the text with.</param>
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/// <returns>The text generated for the given object.</returns>
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public string Render(IFormatProvider provider, object source)
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{
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if (provider == null)
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{
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provider = CultureInfo.CurrentCulture;
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}
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return render(provider, source);
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}
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private string render(IFormatProvider provider, object source)
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{
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Scope keyScope = new Scope(source);
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Scope contextScope = new Scope(new Dictionary<string, object>());
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foreach (EventHandler<KeyFoundEventArgs> handler in _foundHandlers)
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{
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keyScope.KeyFound += handler;
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contextScope.KeyFound += handler;
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}
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foreach (EventHandler<KeyNotFoundEventArgs> handler in _notFoundHandlers)
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{
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keyScope.KeyNotFound += handler;
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contextScope.KeyNotFound += handler;
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}
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foreach (EventHandler<ValueRequestEventArgs> handler in _valueRequestedHandlers)
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{
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contextScope.ValueRequested += handler;
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}
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StringWriter writer = new StringWriter(provider);
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_generator.GetText(writer, keyScope, contextScope, postProcess);
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return writer.ToString();
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}
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private void postProcess(Substitution substitution)
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{
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if (TagFormatted == null)
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{
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return;
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}
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TagFormattedEventArgs args = new TagFormattedEventArgs(substitution.Key, substitution.Substitute, substitution.IsExtension);
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TagFormatted(this, args);
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substitution.Substitute = args.Substitute;
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}
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}
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}
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