| 1 | using System.Diagnostics.CodeAnalysis; |
| 2 | |
| 3 | namespace CascadeIDE.Services.ChordNotation; |
| 4 | |
| 5 | /// <summary> |
| 6 | /// Синтаксический слой «как в UI / hotkeys»: <c>Ctrl+K</c>, <c>Ctrl + Shift + P</c>, <c>⌘K</c>, последовательности через пробел. |
| 7 | /// Разбор не смешивает платформенные строки с грамматикой Vim — результат тот же <see cref="NormalizedKeySequence"/>, что и после <see cref="ChordSemanticNormalizer.FromVimSteps"/>. |
| 8 | /// </summary> |
| 9 | public static class KeyGestureChordSyntax |
| 10 | { |
| 11 | private const char CommandKeySymbol = '\u2318'; // ⌘ |
| 12 | |
| 13 | /// <summary>Пробельно-разделённые токены: каждый либо аккорд с «+», либо префикс ⌘, либо plain.</summary> |
| 14 | public static bool TryParseToNormalized(string? input, out NormalizedKeySequence? sequence, out string error) |
| 15 | { |
| 16 | sequence = null; |
| 17 | error = ""; |
| 18 | |
| 19 | if (string.IsNullOrEmpty(input)) |
| 20 | { |
| 21 | sequence = NormalizedKeySequence.Empty; |
| 22 | return true; |
| 23 | } |
| 24 | |
| 25 | var trimmed = CollapseSpacesAroundPlus(input.Trim()); |
| 26 | var tokens = trimmed.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries); |
| 27 | var steps = new List<NormalizedSequenceStep>(tokens.Length); |
| 28 | |
| 29 | foreach (var raw in tokens) |
| 30 | { |
| 31 | if (!TryParseOneToken(raw, out var step, out var err)) |
| 32 | { |
| 33 | error = err; |
| 34 | return false; |
| 35 | } |
| 36 | |
| 37 | steps.Add(step); |
| 38 | } |
| 39 | |
| 40 | sequence = new NormalizedKeySequence(steps); |
| 41 | return true; |
| 42 | } |
| 43 | |
| 44 | /// <summary>Схлопывает пробелы вокруг <c>+</c>, чтобы <c>Ctrl + Shift + P</c> оставался одним токеном при split по пробелам.</summary> |
| 45 | private static string CollapseSpacesAroundPlus(string input) |
| 46 | { |
| 47 | if (!input.Contains('+', StringComparison.Ordinal)) |
| 48 | return input; |
| 49 | var parts = input.Split('+'); |
| 50 | for (var i = 0; i < parts.Length; i++) |
| 51 | parts[i] = parts[i].Trim(); |
| 52 | return string.Join("+", parts); |
| 53 | } |
| 54 | |
| 55 | private static bool TryParseOneToken(string token, [NotNullWhen(true)] out NormalizedSequenceStep? step, out string error) |
| 56 | { |
| 57 | error = ""; |
| 58 | step = null; |
| 59 | token = token.Trim(); |
| 60 | if (token.Length == 0) |
| 61 | { |
| 62 | error = "Пустой токен."; |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | // ⌘K без плюса |
| 67 | if (token.Length >= 2 && token[0] == CommandKeySymbol) |
| 68 | { |
| 69 | var rest = token[1..]; |
| 70 | step = new NormalizedChordStep(ChordModifierKeys.Meta, ChordSemanticNormalizer.NormalizeKeySymbol(rest)); |
| 71 | return true; |
| 72 | } |
| 73 | |
| 74 | if (!token.Contains('+', StringComparison.Ordinal)) |
| 75 | { |
| 76 | step = new NormalizedPlainKeyStep(ChordSemanticNormalizer.NormalizeKeySymbol(token)); |
| 77 | return true; |
| 78 | } |
| 79 | |
| 80 | var parts = token.Split('+', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries); |
| 81 | if (parts.Length < 2) |
| 82 | { |
| 83 | error = $"Ожидалось хотя бы Mod+Key, получено: «{token}»."; |
| 84 | return false; |
| 85 | } |
| 86 | |
| 87 | ChordModifierKeys mods = 0; |
| 88 | for (var i = 0; i < parts.Length - 1; i++) |
| 89 | { |
| 90 | var mk = MapModifierWord(parts[i]); |
| 91 | if (mk == null) |
| 92 | { |
| 93 | error = $"Неизвестный модификатор: «{parts[i]}»."; |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | mods |= mk.Value; |
| 98 | } |
| 99 | |
| 100 | var key = ChordSemanticNormalizer.NormalizeKeySymbol(parts[^1]); |
| 101 | step = new NormalizedChordStep(mods, key); |
| 102 | return true; |
| 103 | } |
| 104 | |
| 105 | private static ChordModifierKeys? MapModifierWord(string word) |
| 106 | { |
| 107 | if (word.Length == 1 && word[0] == CommandKeySymbol) |
| 108 | return ChordModifierKeys.Meta; |
| 109 | |
| 110 | var w = word.Trim(); |
| 111 | if (w.Length == 0) |
| 112 | return null; |
| 113 | |
| 114 | return w.ToUpperInvariant() switch |
| 115 | { |
| 116 | "CTRL" or "CONTROL" => ChordModifierKeys.Control, |
| 117 | "ALT" or "OPTION" => ChordModifierKeys.Alt, |
| 118 | "SHIFT" => ChordModifierKeys.Shift, |
| 119 | "META" or "CMD" or "COMMAND" or "WIN" or "SUPER" => ChordModifierKeys.Meta, |
| 120 | _ => null |
| 121 | }; |
| 122 | } |
| 123 | } |
| 124 | |