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* Ability to configure font features * Minor adjustments --------- Co-authored-by: Herman Kirshin <herman.kirshin@jetbrains.com> Co-authored-by: Benedikt Stebner <Gillibald@users.noreply.github.com>pull/14430/head
Herman K
2 years ago
committed by
GitHub
GitHub
18 changed files with 479 additions and 19 deletions
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using System.Globalization; |
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using System.Text; |
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using System.Text.RegularExpressions; |
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namespace Avalonia.Media; |
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/// <summary>
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/// Font feature
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/// </summary>
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public record FontFeature |
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{ |
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private const int DefaultValue = 1; |
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private const int InfinityEnd = -1; |
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private static readonly Regex s_featureRegex = new Regex( |
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@"^\s*(?<Value>[+-])?\s*(?<Tag>\w{4})\s*(\[\s*(?<Start>\d+)?(\s*(?<Separator>:)\s*)?(?<End>\d+)?\s*\])?\s*(?(Value)()|(=\s*(?<Value>\d+|on|off)))?\s*$", |
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RegexOptions.Compiled | RegexOptions.ExplicitCapture); |
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/// <summary>Gets or sets the tag.</summary>
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public string Tag |
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{ |
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get; |
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init; |
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} |
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/// <summary>Gets or sets the value.</summary>
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public int Value |
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{ |
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get; |
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init; |
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} |
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/// <summary>Gets or sets the start.</summary>
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public int Start |
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{ |
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get; |
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init; |
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} |
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/// <summary>Gets or sets the end.</summary>
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public int End |
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{ |
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get; |
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init; |
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} |
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/// <summary>
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/// Creates an instance of FontFeature.
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/// </summary>
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public FontFeature() |
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{ |
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Tag = string.Empty; |
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Value = DefaultValue; |
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Start = 0; |
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End = InfinityEnd; |
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} |
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/// <summary>
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/// Parses a string to return a <see cref="FontFeature"/>.
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/// Syntax is the following:
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///
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/// Syntax Value Start End
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/// Setting value:
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/// kern 1 0 ∞ Turn feature on
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/// +kern 1 0 ∞ Turn feature on
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/// -kern 0 0 ∞ Turn feature off
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/// kern=0 0 0 ∞ Turn feature off
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/// kern=1 1 0 ∞ Turn feature on
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/// aalt=2 2 0 ∞ Choose 2nd alternate
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/// Setting index:
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/// kern[] 1 0 ∞ Turn feature on
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/// kern[:] 1 0 ∞ Turn feature on
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/// kern[5:] 1 5 ∞ Turn feature on, partial
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/// kern[:5] 1 0 5 Turn feature on, partial
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/// kern[3:5] 1 3 5 Turn feature on, range
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/// kern[3] 1 3 3+1 Turn feature on, single char
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/// Mixing it all:
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/// aalt[3:5]=2 2 3 5 Turn 2nd alternate on for range
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///
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/// </summary>
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/// <param name="s">The string.</param>
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/// <returns>The <see cref="FontFeature"/>.</returns>
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// ReSharper disable once UnusedMember.Global
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public static FontFeature Parse(string s) |
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{ |
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var match = s_featureRegex.Match(s); |
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if (!match.Success) |
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{ |
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return new FontFeature(); |
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} |
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var hasSeparator = match.Groups["Separator"].Value == ":"; |
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var hasStart = int.TryParse(match.Groups["Start"].Value, NumberStyles.None, CultureInfo.InvariantCulture, out var start); |
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var hasEnd = int.TryParse(match.Groups["End"].Value, NumberStyles.None, CultureInfo.InvariantCulture, out var end); |
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var stringValue = match.Groups["Value"].Value; |
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if (stringValue == "-" || stringValue.ToUpperInvariant() == "OFF") |
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stringValue = "0"; |
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if (stringValue == "+" || stringValue.ToUpperInvariant() == "ON") |
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stringValue = "1"; |
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var result = new FontFeature |
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{ |
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Tag = match.Groups["Tag"].Value, |
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Start = hasStart ? start : 0, |
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End = hasEnd ? end : hasStart && !hasSeparator ? (start + 1) : InfinityEnd, |
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Value = int.TryParse(stringValue, NumberStyles.None, CultureInfo.InvariantCulture, out var value) ? value : DefaultValue, |
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}; |
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return result; |
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} |
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/// <summary>
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/// Gets a string representation of the <see cref="FontFeature"/>.
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/// </summary>
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/// <returns>The string representation.</returns>
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public override string ToString() |
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{ |
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var result = new StringBuilder(128); |
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if (Value == 0) |
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result.Append('-'); |
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result.Append(Tag ?? string.Empty); |
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if (Start != 0 || End != InfinityEnd) |
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{ |
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result.Append('['); |
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if (Start > 0) |
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result.Append(Start.ToString(CultureInfo.InvariantCulture)); |
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if (End != Start + 1) |
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{ |
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result.Append(':'); |
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if (End != InfinityEnd) |
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result.Append(End.ToString(CultureInfo.InvariantCulture)); |
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} |
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result.Append(']'); |
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} |
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if (Value is DefaultValue or 0) |
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{ |
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return result.ToString(); |
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} |
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result.Append('='); |
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result.Append(Value.ToString(CultureInfo.InvariantCulture)); |
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return result.ToString(); |
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} |
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} |
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@ -0,0 +1,10 @@ |
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using Avalonia.Collections; |
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namespace Avalonia.Media; |
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/// <summary>
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/// List of font feature settings
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/// </summary>
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public class FontFeatureCollection : AvaloniaList<FontFeature> |
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{ |
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} |
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