73 lines
2.5 KiB
C#
73 lines
2.5 KiB
C#
using System;
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using System.IO;
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using System.Text;
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namespace Mustache
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{
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/// <summary>
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/// Substitutes a key placeholder with the textual representation of the associated object.
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/// </summary>
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internal sealed class KeyGenerator : IGenerator
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{
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private readonly string _key;
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private readonly string _format;
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private readonly bool _isVariable;
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private readonly bool _isExtension;
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/// <summary>
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/// Initializes a new instance of a KeyGenerator.
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/// </summary>
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/// <param name="key">The key to substitute with its value.</param>
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/// <param name="alignment">The alignment specifier.</param>
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/// <param name="formatting">The format specifier.</param>
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/// <param name="isExtension">Specifies whether the key was found within triple curly braces.</param>
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public KeyGenerator(string key, string alignment, string formatting, bool isExtension)
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{
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if (key.StartsWith("@"))
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{
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_key = key.Substring(1);
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_isVariable = true;
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}
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else
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{
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_key = key;
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_isVariable = false;
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}
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_format = getFormat(alignment, formatting);
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_isExtension = isExtension;
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}
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private static string getFormat(string alignment, string formatting)
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{
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StringBuilder formatBuilder = new StringBuilder();
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formatBuilder.Append("{0");
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if (!String.IsNullOrWhiteSpace(alignment))
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{
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formatBuilder.Append(",");
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formatBuilder.Append(alignment.TrimStart('+'));
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}
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if (!String.IsNullOrWhiteSpace(formatting))
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{
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formatBuilder.Append(":");
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formatBuilder.Append(formatting);
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}
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formatBuilder.Append("}");
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return formatBuilder.ToString();
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}
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void IGenerator.GetText(TextWriter writer, Scope scope, Scope context, Action<Substitution> postProcessor)
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{
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object value = _isVariable ? context.Find(_key, _isExtension) : scope.Find(_key, _isExtension);
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string result = String.Format(writer.FormatProvider, _format, value);
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Substitution substitution = new Substitution()
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{
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Key = _key,
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Substitute = result,
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IsExtension = _isExtension
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};
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postProcessor(substitution);
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writer.Write(substitution.Substitute);
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}
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}
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}
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