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Use span tokenization in multi-line emission logic
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129 changes: 129 additions & 0 deletions
129
src/libraries/Microsoft.Extensions.Configuration.Binder/gen/SourceWriter.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
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| using System; | ||
| using System.Diagnostics; | ||
| using System.Text; | ||
| using Microsoft.CodeAnalysis.Text; | ||
|
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| namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration | ||
| { | ||
| internal sealed class SourceWriter | ||
| { | ||
| private readonly StringBuilder _sb = new(); | ||
| private int _indentationLevel; | ||
|
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| public int Length => _sb.Length; | ||
| public int IndentationLevel => _indentationLevel; | ||
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| private static readonly char[] s_newLine = Environment.NewLine.ToCharArray(); | ||
|
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| public void WriteBlockStart(string? declaration = null) | ||
| { | ||
| if (declaration is not null) | ||
| { | ||
| WriteLine(declaration); | ||
| } | ||
| WriteLine("{"); | ||
| _indentationLevel++; | ||
| } | ||
|
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| public void WriteBlockEnd(string? extra = null) | ||
| { | ||
| _indentationLevel--; | ||
| Debug.Assert(_indentationLevel > -1); | ||
| WriteLine($"}}{extra}"); | ||
| } | ||
|
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| public void WriteLine(string source) | ||
| { | ||
| _sb.Append(' ', 4 * _indentationLevel); | ||
| _sb.AppendLine(source); | ||
| } | ||
|
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| public unsafe void WriteLine(ReadOnlySpan<char> source) | ||
| { | ||
| _sb.Append(' ', 4 * _indentationLevel); | ||
| fixed (char* ptr = source) | ||
| { | ||
| _sb.Append(ptr, source.Length); | ||
| WriteBlankLine(); | ||
| } | ||
| } | ||
|
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| public void WriteBlock(string source) | ||
| { | ||
| bool isFinalLine; | ||
| ReadOnlySpan<char> remainingText = source.AsSpan(); | ||
|
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| do | ||
| { | ||
| ReadOnlySpan<char> line = GetNextLine(ref remainingText, out isFinalLine); | ||
| switch (line) | ||
| { | ||
| case "{": | ||
| { | ||
| WriteBlockStart(); | ||
| } | ||
| break; | ||
| case "}": | ||
| { | ||
| WriteBlockEnd(); | ||
| } | ||
| break; | ||
| default: | ||
| { | ||
| WriteLine(line); | ||
| } | ||
| break; | ||
| } | ||
| } while (!isFinalLine); | ||
| } | ||
|
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| public void WriteBlankLine() => _sb.AppendLine(); | ||
|
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| public void RemoveBlankLine() | ||
| { | ||
| int newLineLength = s_newLine.Length; | ||
| int lastNewLineStartIndex = Length - newLineLength; | ||
| _sb.Remove(lastNewLineStartIndex, newLineLength); | ||
| } | ||
|
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| public SourceText ToSourceText() | ||
| { | ||
| Debug.Assert(_indentationLevel == 0 && _sb.Length > 0); | ||
| return SourceText.From(_sb.ToString(), Encoding.UTF8); | ||
| } | ||
|
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| private static ReadOnlySpan<char> GetNextLine(ref ReadOnlySpan<char> remainingText, out bool isFinalLine) | ||
| { | ||
| if (remainingText.IsEmpty) | ||
| { | ||
| isFinalLine = true; | ||
| return default; | ||
| } | ||
|
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| ReadOnlySpan<char> next; | ||
| ReadOnlySpan<char> rest; | ||
|
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| remainingText = remainingText.Trim(); | ||
|
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| int lineLength = remainingText.IndexOf(s_newLine); | ||
| if (lineLength == -1) | ||
| { | ||
| lineLength = remainingText.Length; | ||
| isFinalLine = true; | ||
| rest = default; | ||
| } | ||
| else | ||
| { | ||
| rest = remainingText.Slice(lineLength + 1); | ||
| isFinalLine = false; | ||
| } | ||
|
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| next = remainingText.Slice(0, lineLength); | ||
| remainingText = rest; | ||
| return next; | ||
| } | ||
| } | ||
| } |
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