90 lines
3.4 KiB
C#
90 lines
3.4 KiB
C#
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using System;
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namespace mustache
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{
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/// <summary>
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/// Removes unnecessary whitespace from static text.
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/// </summary>
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internal sealed class Trimmer
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{
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private bool hasHeader;
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private bool hasFooter;
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private bool hasTag;
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private bool canTrim;
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/// <summary>
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/// Initializes a new instance of a Trimmer.
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/// </summary>
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public Trimmer()
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{
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hasTag = false;
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canTrim = true;
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}
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/// <summary>
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/// Processes the given text, creating a StaticGenerator and adding it to the current compound generator.
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/// </summary>
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/// <param name="generator">The compound generator to add the static generator to.</param>
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/// <param name="isHeader">Gets whether we're encountered the header tag.</param>
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/// <param name="value">The static text to trim.</param>
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public void AddStaticGeneratorBeforeTag(CompoundGenerator generator, bool isHeader, string value)
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{
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string trimmed = processLines(value);
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hasHeader |= isHeader;
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hasFooter |= hasHeader && !isHeader;
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addStaticGenerator(generator, trimmed);
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}
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/// <summary>
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/// Processes the given text, creating a StaticGenerator and adding it to the current compound generator.
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/// </summary>
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/// <param name="generator">The compound generator to add the static generator to.</param>
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/// <param name="isOutput">Specifies whether the tag results in output.</param>
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/// <param name="value">The static text to trim.</param>
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public void AddStaticGenerator(CompoundGenerator generator, bool isOutput, string value)
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{
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string trimmed = processLines(value);
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canTrim &= !isOutput;
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addStaticGenerator(generator, trimmed);
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}
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private string processLines(string value)
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{
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string trimmed = value;
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int newline = value.IndexOf(Environment.NewLine);
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if (newline == -1)
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{
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canTrim &= String.IsNullOrWhiteSpace(value);
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}
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else
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{
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// finish processing the previous line
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if (canTrim && hasTag && (!hasHeader || !hasFooter))
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{
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string lineEnd = trimmed.Substring(0, newline);
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if (String.IsNullOrWhiteSpace(lineEnd))
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{
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trimmed = trimmed.Substring(newline + Environment.NewLine.Length);
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}
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}
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// start processing the next line
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hasTag = false;
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hasHeader = false;
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hasFooter = false;
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int lastNewline = value.LastIndexOf(Environment.NewLine);
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string lineStart = value.Substring(lastNewline + Environment.NewLine.Length);
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canTrim = String.IsNullOrWhiteSpace(lineStart);
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}
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return trimmed;
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}
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private static void addStaticGenerator(CompoundGenerator generator, string trimmed)
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{
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if (trimmed.Length > 0)
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{
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StaticGenerator leading = new StaticGenerator(trimmed);
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generator.AddGenerator(leading);
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}
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}
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}
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}
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