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ExportStringBuilder.cs
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ExportStringBuilder.cs
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// <copyright file="ExportStringBuilder.cs" company="Microsoft Corporation">
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License (MIT). See LICENSE in the repo root for license information.
// </copyright>
using System.Text;
namespace Microsoft.Health.Fhir.SpecManager.Language;
/// <summary>An export string builder.</summary>
public class ExportStringBuilder
{
/// <summary>The current level of indentation.</summary>
private int _indentation = 0;
/// <summary>The indent character.</summary>
private char _indentChar = ' ';
/// <summary>The number of repetitions of the indent character per level.</summary>
private int _charsPerLevel = 2;
/// <summary>The string builder.</summary>
private StringBuilder _sb;
/// <summary>
/// Initializes a new instance of the <see cref="ExportStringBuilder"/> class.
/// </summary>
public ExportStringBuilder()
{
_sb = new();
}
/// <summary>Gets the current level of indentation.</summary>
public int Indentation => _indentation;
/// <summary>Gets the indentation character.</summary>
public char IndentationChar => _indentChar;
/// <summary>Gets the characters per indentation level.</summary>
public int CharactersPerIndentation => _charsPerLevel;
/// <summary>Returns a string that represents the current object.</summary>
/// <returns>A string that represents the current object.</returns>
public override string ToString() => _sb.ToString();
/// <summary>Increase indent.</summary>
public void IncreaseIndent()
{
_indentation++;
}
/// <summary>Opens a scope (writes literal on a line, then indents).</summary>
/// <param name="openLiteral">(Optional) The scope open literal.</param>
public void OpenScope(string openLiteral = "{")
{
WriteLineIndented(openLiteral);
IncreaseIndent();
}
/// <summary>Decrease indent.</summary>
public void DecreaseIndent()
{
if (_indentation <= 0)
{
throw new System.Exception($"Cannot decrease indentation below: {_indentation}");
}
_indentation--;
}
/// <summary>Closes a scope (decreases indent, then writes literal on a line).</summary>
/// <param name="closeLiteral">(Optional) The close literal.</param>
public void CloseScope(string closeLiteral = "}")
{
DecreaseIndent();
WriteLineIndented(closeLiteral);
}
/// <summary>
/// Reopens a scope (decreases indent, writes a literal, then increases indent).
/// </summary>
/// <param name="literal">The literal.</param>
public void ReopenScope(string literal)
{
DecreaseIndent();
WriteLineIndented(literal);
IncreaseIndent();
}
/// <summary>Sets an indent.</summary>
/// <param name="level">The level.</param>
public void SetIndent(int level)
{
if (level < 0)
{
throw new System.ArgumentOutOfRangeException(nameof(level));
}
_indentation = level;
}
/// <summary>Sets indentation character.</summary>
/// <param name="indentChar">The indent character.</param>
public void SetIndentationChar(char indentChar)
{
_indentChar = indentChar;
}
/// <summary>Sets characters per indentation.</summary>
/// <exception cref="ArgumentOutOfRangeException">Thrown when one or more arguments are outside the
/// required range.</exception>
/// <param name="charsPerIndentLevel">The characters per indent level.</param>
public void SetCharsPerIndentation(int charsPerIndentLevel)
{
if (charsPerIndentLevel < 0)
{
throw new System.ArgumentOutOfRangeException(nameof(charsPerIndentLevel));
}
_charsPerLevel = charsPerIndentLevel;
}
/// <summary>Appends a sb.</summary>
/// <param name="sb">The string builder.</param>
public void Append(ExportStringBuilder sb)
{
_sb.Append(sb._sb.ToString());
}
/// <summary>Writes.</summary>
/// <param name="value">The value.</param>
public void Write(string value)
{
_sb.Append(value);
}
/// <summary>Writes a line.</summary>
/// <param name="value">The value.</param>
public void WriteLine(string value)
{
_sb.AppendLine(value);
}
/// <summary>Writes a value, indented.</summary>
/// <param name="value">The value.</param>
public void WriteIndented(string value)
{
int count = _indentation * _charsPerLevel;
if (count == 0)
{
_sb.Append(value);
return;
}
// optimize common value
if (_indentChar == ' ')
{
switch (count)
{
case 1:
_sb.Append(" ");
_sb.Append(value);
return;
case 2:
_sb.Append(" ");
_sb.Append(value);
return;
case 3:
_sb.Append(" ");
_sb.Append(value);
return;
case 4:
_sb.Append(" ");
_sb.Append(value);
return;
case 5:
_sb.Append(" ");
_sb.Append(value);
return;
case 6:
_sb.Append(" ");
_sb.Append(value);
return;
case 7:
_sb.Append(" ");
_sb.Append(value);
return;
case 8:
_sb.Append(" ");
_sb.Append(value);
return;
case 9:
_sb.Append(" ");
_sb.Append(value);
return;
case 10:
_sb.Append(" ");
_sb.Append(value);
return;
}
}
_sb.Append(new string(_indentChar, count));
_sb.Append(value);
}
/// <summary>Writes a value, indented.</summary>
/// <param name="value">The value.</param>
public void WriteLineIndented(string value)
{
int count = _indentation * _charsPerLevel;
if (count == 0)
{
_sb.AppendLine(value);
return;
}
// optimize common value
if (_indentChar == ' ')
{
switch (count)
{
case 1:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 2:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 3:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 4:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 5:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 6:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 7:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 8:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 9:
_sb.Append(" ");
_sb.AppendLine(value);
return;
case 10:
_sb.Append(" ");
_sb.AppendLine(value);
return;
}
}
_sb.Append(new string(_indentChar, count));
_sb.AppendLine(value);
}
}