Julien Lebosquain
4 years ago
40 changed files with 457 additions and 873 deletions
@ -1,275 +0,0 @@ |
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using System; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Runtime.CompilerServices; |
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using Avalonia.Utilities; |
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namespace Avalonia.Media.TextFormatting |
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{ |
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public readonly struct CharacterBufferRange : IReadOnlyList<char> |
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{ |
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/// <summary>
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/// Getting an empty character string
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/// </summary>
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public static CharacterBufferRange Empty => new CharacterBufferRange(); |
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/// <summary>
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/// Construct <see cref="CharacterBufferRange"/> from character array
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/// </summary>
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/// <param name="characterArray">character array</param>
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/// <param name="offsetToFirstChar">character buffer offset to the first character</param>
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/// <param name="characterLength">character length</param>
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public CharacterBufferRange( |
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char[] characterArray, |
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int offsetToFirstChar, |
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int characterLength |
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) |
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: this( |
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new CharacterBufferReference(characterArray, offsetToFirstChar), |
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characterLength |
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) |
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{ } |
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/// <summary>
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/// Construct <see cref="CharacterBufferRange"/> from string
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/// </summary>
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/// <param name="characterString">character string</param>
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/// <param name="offsetToFirstChar">character buffer offset to the first character</param>
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/// <param name="characterLength">character length</param>
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public CharacterBufferRange( |
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string characterString, |
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int offsetToFirstChar, |
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int characterLength |
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) |
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: this( |
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new CharacterBufferReference(characterString, offsetToFirstChar), |
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characterLength |
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) |
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{ } |
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/// <summary>
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/// Construct a <see cref="CharacterBufferRange"/> from <see cref="CharacterBufferReference"/>
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/// </summary>
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/// <param name="characterBufferReference">character buffer reference</param>
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/// <param name="characterLength">number of characters</param>
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public CharacterBufferRange( |
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CharacterBufferReference characterBufferReference, |
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int characterLength |
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) |
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{ |
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if (characterLength < 0) |
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{ |
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throw new ArgumentOutOfRangeException("characterLength", "ParameterCannotBeNegative"); |
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} |
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int maxLength = characterBufferReference.CharacterBuffer.Length > 0 ? |
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characterBufferReference.CharacterBuffer.Length - characterBufferReference.OffsetToFirstChar : |
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0; |
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if (characterLength > maxLength) |
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{ |
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throw new ArgumentOutOfRangeException("characterLength", $"ParameterCannotBeGreaterThan {maxLength}"); |
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} |
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CharacterBufferReference = characterBufferReference; |
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Length = characterLength; |
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} |
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/// <summary>
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/// Construct a <see cref="CharacterBufferRange"/> from part of another <see cref="CharacterBufferRange"/>
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/// </summary>
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internal CharacterBufferRange( |
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CharacterBufferRange characterBufferRange, |
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int offsetToFirstChar, |
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int characterLength |
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) : |
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this( |
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characterBufferRange.CharacterBuffer, |
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characterBufferRange.OffsetToFirstChar + offsetToFirstChar, |
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characterLength |
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) |
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{ } |
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/// <summary>
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/// Construct a <see cref="CharacterBufferRange"/> from string
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/// </summary>
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internal CharacterBufferRange( |
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string charString |
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) : |
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this( |
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charString, |
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0, |
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charString.Length |
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) |
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{ } |
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/// <summary>
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/// Construct <see cref="CharacterBufferRange"/> from memory buffer
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/// </summary>
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internal CharacterBufferRange( |
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ReadOnlyMemory<char> charBuffer, |
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int offsetToFirstChar, |
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int characterLength |
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) : |
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this( |
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new CharacterBufferReference(charBuffer, offsetToFirstChar), |
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characterLength |
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) |
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{ } |
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/// <summary>
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/// Construct a <see cref="CharacterBufferRange"/> by extracting text info from a text run
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/// </summary>
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internal CharacterBufferRange(TextRun textRun) |
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{ |
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CharacterBufferReference = textRun.CharacterBufferReference; |
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Length = textRun.Length; |
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} |
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public char this[int index] |
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{ |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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get |
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{ |
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#if DEBUG
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if (index.CompareTo(0) < 0 || index.CompareTo(Length) > 0) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(index)); |
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} |
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#endif
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return CharacterBuffer.Span[CharacterBufferReference.OffsetToFirstChar + index]; |
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} |
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} |
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/// <summary>
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/// Gets a reference to the character buffer
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/// </summary>
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public CharacterBufferReference CharacterBufferReference { get; } |
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/// <summary>
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/// Gets the number of characters in text source character store
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/// </summary>
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public int Length { get; } |
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/// <summary>
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/// Gets a span from the character buffer range
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/// </summary>
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public ReadOnlySpan<char> Span => CharacterBuffer.Span.Slice(OffsetToFirstChar, Length); |
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/// <summary>
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/// Gets the character memory buffer
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/// </summary>
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internal ReadOnlyMemory<char> CharacterBuffer => CharacterBufferReference.CharacterBuffer; |
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/// <summary>
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/// Gets the character offset relative to the beginning of buffer to
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/// the first character of the run
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/// </summary>
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internal int OffsetToFirstChar => CharacterBufferReference.OffsetToFirstChar; |
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/// <summary>
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/// Indicate whether the character buffer range is empty
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/// </summary>
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internal bool IsEmpty => CharacterBuffer.Length == 0 || Length <= 0; |
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internal CharacterBufferRange Take(int length) |
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{ |
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if (IsEmpty) |
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{ |
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return this; |
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} |
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if (length > Length) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(length)); |
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} |
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return new CharacterBufferRange(CharacterBufferReference, length); |
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} |
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internal CharacterBufferRange Skip(int length) |
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{ |
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if (IsEmpty) |
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{ |
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return this; |
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} |
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if (length > Length) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(length)); |
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} |
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if (length == Length) |
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{ |
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return new CharacterBufferRange(new CharacterBufferReference(), 0); |
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} |
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var characterBufferReference = new CharacterBufferReference(CharacterBuffer, OffsetToFirstChar + length); |
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return new CharacterBufferRange(characterBufferReference, Length - length); |
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} |
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/// <summary>
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/// Compute hash code
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/// </summary>
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public override int GetHashCode() |
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{ |
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return CharacterBufferReference.GetHashCode() ^ Length; |
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} |
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/// <summary>
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/// Test equality with the input object
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/// </summary>
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/// <param name="obj"> The object to test </param>
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public override bool Equals(object? obj) |
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{ |
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if (obj is CharacterBufferRange range) |
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{ |
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return Equals(range); |
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} |
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return false; |
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} |
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/// <summary>
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/// Test equality with the input CharacterBufferRange
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/// </summary>
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/// <param name="value"> The CharacterBufferRange value to test </param>
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public bool Equals(CharacterBufferRange value) |
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{ |
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return CharacterBufferReference.Equals(value.CharacterBufferReference) |
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&& Length == value.Length; |
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} |
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/// <summary>
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/// Compare two CharacterBufferRange for equality
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/// </summary>
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/// <param name="left">left operand</param>
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/// <param name="right">right operand</param>
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/// <returns>whether or not two operands are equal</returns>
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public static bool operator ==(CharacterBufferRange left, CharacterBufferRange right) |
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{ |
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return left.Equals(right); |
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} |
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/// <summary>
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/// Compare two CharacterBufferRange for inequality
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/// </summary>
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/// <param name="left">left operand</param>
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/// <param name="right">right operand</param>
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/// <returns>whether or not two operands are equal</returns>
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public static bool operator !=(CharacterBufferRange left, CharacterBufferRange right) |
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{ |
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return !(left == right); |
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} |
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int IReadOnlyCollection<char>.Count => Length; |
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public IEnumerator<char> GetEnumerator() => new ImmutableReadOnlyListStructEnumerator<char>(this); |
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); |
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} |
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} |
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@ -1,115 +0,0 @@ |
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using System; |
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namespace Avalonia.Media.TextFormatting |
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{ |
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/// <summary>
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/// Text character buffer reference
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/// </summary>
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public readonly struct CharacterBufferReference : IEquatable<CharacterBufferReference> |
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{ |
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/// <summary>
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/// Construct character buffer reference from character array
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/// </summary>
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/// <param name="characterArray">character array</param>
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/// <param name="offsetToFirstChar">character buffer offset to the first character</param>
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public CharacterBufferReference(char[] characterArray, int offsetToFirstChar = 0) |
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: this(characterArray.AsMemory(), offsetToFirstChar) |
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{ } |
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/// <summary>
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/// Construct character buffer reference from string
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/// </summary>
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/// <param name="characterString">character string</param>
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/// <param name="offsetToFirstChar">character buffer offset to the first character</param>
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public CharacterBufferReference(string characterString, int offsetToFirstChar = 0) |
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: this(characterString.AsMemory(), offsetToFirstChar) |
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{ } |
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/// <summary>
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/// Construct character buffer reference from memory buffer
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/// </summary>
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internal CharacterBufferReference(ReadOnlyMemory<char> characterBuffer, int offsetToFirstChar = 0) |
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{ |
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if (offsetToFirstChar < 0) |
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{ |
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throw new ArgumentOutOfRangeException("offsetToFirstChar", "ParameterCannotBeNegative"); |
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} |
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// maximum offset is one less than CharacterBuffer.Count, except that zero is always a valid offset
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// even in the case of an empty or null character buffer
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var maxOffset = characterBuffer.Length == 0 ? 0 : Math.Max(0, characterBuffer.Length - 1); |
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if (offsetToFirstChar > maxOffset) |
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{ |
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throw new ArgumentOutOfRangeException("offsetToFirstChar", $"ParameterCannotBeGreaterThan, {maxOffset}"); |
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} |
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CharacterBuffer = characterBuffer; |
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OffsetToFirstChar = offsetToFirstChar; |
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} |
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/// <summary>
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/// Gets the character memory buffer
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/// </summary>
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public ReadOnlyMemory<char> CharacterBuffer { get; } |
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/// <summary>
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/// Gets the character offset relative to the beginning of buffer to
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/// the first character of the run
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/// </summary>
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public int OffsetToFirstChar { get; } |
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/// <summary>
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/// Compute hash code
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/// </summary>
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public override int GetHashCode() |
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{ |
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return CharacterBuffer.IsEmpty ? 0 : CharacterBuffer.GetHashCode(); |
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} |
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/// <summary>
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/// Test equality with the input object
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/// </summary>
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/// <param name="obj"> The object to test. </param>
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public override bool Equals(object? obj) |
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{ |
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if (obj is CharacterBufferReference reference) |
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{ |
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return Equals(reference); |
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} |
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return false; |
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} |
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/// <summary>
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/// Test equality with the input CharacterBufferReference
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/// </summary>
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/// <param name="value"> The characterBufferReference value to test </param>
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public bool Equals(CharacterBufferReference value) |
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{ |
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return CharacterBuffer.Equals(value.CharacterBuffer); |
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} |
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/// <summary>
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/// Compare two CharacterBufferReference for equality
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/// </summary>
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/// <param name="left">left operand</param>
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/// <param name="right">right operand</param>
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/// <returns>whether or not two operands are equal</returns>
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public static bool operator ==(CharacterBufferReference left, CharacterBufferReference right) |
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{ |
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return left.Equals(right); |
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} |
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/// <summary>
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/// Compare two CharacterBufferReference for inequality
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/// </summary>
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/// <param name="left">left operand</param>
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/// <param name="right">right operand</param>
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/// <returns>whether or not two operands are equal</returns>
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public static bool operator !=(CharacterBufferReference left, CharacterBufferReference right) |
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{ |
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return !(left == right); |
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} |
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} |
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} |
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@ -0,0 +1,15 @@ |
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using System; |
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using System.Runtime.InteropServices; |
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namespace Avalonia.UnitTests |
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{ |
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public static class TextTestHelper |
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{ |
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public static int GetStartCharIndex(ReadOnlyMemory<char> text) |
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{ |
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if (!MemoryMarshal.TryGetString(text, out _, out var start, out _)) |
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throw new InvalidOperationException("text memory should have been a string"); |
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return start; |
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} |
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} |
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} |
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