| @@ -0,0 +1,1208 @@ |
| 1 | import Foundation |
| 2 | |
| 3 | /// Modal editing as Doom's evil gives it: normal, insert, visual and visual-line states; |
| 4 | /// counts, registers, operators with motions and text objects, `.` repeat, evil-snipe's `s` |
| 5 | /// and `S`, `Y` to the end of the line, and the unnamed register on the system clipboard. |
| 6 | /// Keys go in; edits, moves and commands come out for the editor to apply. |
| 7 | public struct Vim: Sendable { |
| 8 | public enum Mode: String, Sendable { |
| 9 | case normal, insert, visual |
| 10 | case visualLine = "visual-line" |
| 11 | |
| 12 | /// The keymap mode name for bindings. |
| 13 | public var keymapMode: String { |
| 14 | switch self { |
| 15 | case .normal: "normal" |
| 16 | case .insert: "insert" |
| 17 | case .visual, .visualLine: "visual" |
| 18 | } |
| 19 | } |
| 20 | } |
| 21 | |
| 22 | public enum Action: Equatable, Sendable { |
| 23 | /// Replace text and put the caret (and, in visual states, the selection) somewhere. |
| 24 | case edit([TextEdit], caret: Int) |
| 25 | case move(caret: Int) |
| 26 | /// The selection to show in a visual state, `lowerBound..<upperBound`. |
| 27 | case select(Range<Int>) |
| 28 | case command(String) |
| 29 | case undo(Int) |
| 30 | case redo(Int) |
| 31 | case setClipboard(String) |
| 32 | /// Ask for a search pattern (`/`, `?`) or an ex command (`:`). |
| 33 | case prompt(String) |
| 34 | case message(String) |
| 35 | } |
| 36 | |
| 37 | public struct Context: Sendable { |
| 38 | public var text: String |
| 39 | public var caret: Int |
| 40 | public var clipboard: String? |
| 41 | /// Lines in a half page, for C-d and C-u. |
| 42 | public var halfPage: Int |
| 43 | |
| 44 | public init(text: String, caret: Int, clipboard: String? = nil, halfPage: Int = 15) { |
| 45 | self.text = text |
| 46 | self.caret = caret |
| 47 | self.clipboard = clipboard |
| 48 | self.halfPage = halfPage |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | public private(set) var mode: Mode = .normal |
| 53 | /// Keys of the command being typed. |
| 54 | public private(set) var pending: [KeyChord] = [] |
| 55 | var registers: [Character: (text: String, linewise: Bool)] = [:] |
| 56 | /// What the clipboard held when this engine last wrote it, and whether that was whole lines. |
| 57 | var clipboardRecord: (text: String, linewise: Bool)? |
| 58 | var anchor = 0 |
| 59 | var goalColumn: Int? |
| 60 | var lastFind: (kind: Character, char: String)? |
| 61 | var lastSnipe: (forward: Bool, chars: String)? |
| 62 | var lastSearch: (pattern: String, forward: Bool)? |
| 63 | /// The keys and inserted text of the last change, for `.`. |
| 64 | var lastChange: (keys: [KeyChord], inserted: String?)? |
| 65 | var changeKeys: [KeyChord]? |
| 66 | var insertStart = 0 |
| 67 | /// The caret when the command began, for commands that keep its column. |
| 68 | var caretForApply = 0 |
| 69 | /// Typed in insert state since it began, kept by `inserted(_:)`. |
| 70 | var insertedText = "" |
| 71 | |
| 72 | public init() {} |
| 73 | |
| 74 | // MARK: - Feeding keys |
| 75 | |
| 76 | public mutating func feed(_ key: KeyChord, _ context: Context) -> [Action] { |
| 77 | switch mode { |
| 78 | case .insert: |
| 79 | return insertKey(key, context) |
| 80 | case .normal, .visual, .visualLine: |
| 81 | pending.append(key) |
| 82 | let keys = pending |
| 83 | caretForApply = context.caret |
| 84 | var buffer = Buffer(context) |
| 85 | switch parse(keys, &buffer, context) { |
| 86 | case .incomplete: |
| 87 | return [] |
| 88 | case .invalid: |
| 89 | pending = [] |
| 90 | return [] |
| 91 | case .done(let actions): |
| 92 | pending = [] |
| 93 | return actions |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /// Text typed in insert state, recorded for `.`. |
| 99 | public mutating func inserted(_ text: String) { |
| 100 | insertedText += text |
| 101 | } |
| 102 | |
| 103 | public mutating func deletedBackward() { |
| 104 | if !insertedText.isEmpty { insertedText.removeLast() } |
| 105 | } |
| 106 | |
| 107 | private mutating func insertKey(_ key: KeyChord, _ context: Context) -> [Action] { |
| 108 | let buffer = Buffer(context) |
| 109 | if key == KeyChord("ESC") || key == KeyChord("[", .control) || key == KeyChord("g", .control) { |
| 110 | mode = .normal |
| 111 | if var keys = changeKeys { |
| 112 | keys.append(KeyChord("ESC")) |
| 113 | lastChange = (keys, insertedText) |
| 114 | changeKeys = nil |
| 115 | } |
| 116 | let caret = context.caret |
| 117 | let lineStart = buffer.lineStart(caret) |
| 118 | return [.move(caret: caret > lineStart ? caret - 1 : caret)] |
| 119 | } |
| 120 | if key == KeyChord("w", .control) { |
| 121 | let start = buffer.wordBackward(context.caret, bigWord: false, stopAtLine: true) |
| 122 | guard start < context.caret else { return [] } |
| 123 | return [.edit([TextEdit(range: start..<context.caret, replacement: "")], caret: start)] |
| 124 | } |
| 125 | if key == KeyChord("u", .control) { |
| 126 | let start = buffer.firstNonBlank(buffer.lineStart(context.caret)) |
| 127 | let from = context.caret > start ? start : buffer.lineStart(context.caret) |
| 128 | guard from < context.caret else { return [] } |
| 129 | return [.edit([TextEdit(range: from..<context.caret, replacement: "")], caret: from)] |
| 130 | } |
| 131 | return [] |
| 132 | } |
| 133 | |
| 134 | /// Whether a key in insert state belongs to the text system. |
| 135 | public func passesThrough(_ key: KeyChord) -> Bool { |
| 136 | guard mode == .insert else { return false } |
| 137 | return !(key == KeyChord("ESC") || key == KeyChord("[", .control) || key == KeyChord("g", .control) |
| 138 | || key == KeyChord("w", .control) || key == KeyChord("u", .control)) |
| 139 | } |
| 140 | |
| 141 | public mutating func enterInsert(at caret: Int, keys: [KeyChord]) { |
| 142 | mode = .insert |
| 143 | insertStart = caret |
| 144 | insertedText = "" |
| 145 | changeKeys = keys |
| 146 | } |
| 147 | |
| 148 | // MARK: - Parsing |
| 149 | |
| 150 | enum Parse { |
| 151 | case incomplete |
| 152 | case invalid |
| 153 | case done([Action]) |
| 154 | } |
| 155 | |
| 156 | struct Command { |
| 157 | var register: Character? |
| 158 | var count: Int? |
| 159 | var keys: ArraySlice<KeyChord> |
| 160 | } |
| 161 | |
| 162 | /// `evil-shift-width`, which Doom keeps equal to `tab-width`: 8 in Org. |
| 163 | static let shiftWidth = 8 |
| 164 | |
| 165 | /// What `indent-according-to-mode` gives a line after `line` in Org: under a list item, |
| 166 | /// its text's column; under a heading, none; otherwise `line`'s own indentation. |
| 167 | static func indentation(for buffer: Buffer, line: Int) -> String { |
| 168 | let text = buffer.substring(buffer.lineStart(line)..<buffer.lineEnd(line)) |
| 169 | let item = try! NSRegularExpression(pattern: "^[ \\t]*([-+*]|[0-9]+[.)])[ \\t]+") |
| 170 | let ns = text as NSString |
| 171 | if text.hasPrefix("*") { return "" } |
| 172 | if let m = item.firstMatch(in: text, range: NSRange(location: 0, length: ns.length)) { |
| 173 | return String(repeating: " ", count: m.range.length) |
| 174 | } |
| 175 | return String(text.prefix { $0 == " " || $0 == "\t" }) |
| 176 | } |
| 177 | |
| 178 | static func digit(_ key: KeyChord) -> Int? { |
| 179 | guard key.modifiers.isEmpty, key.key.count == 1, let d = Int(key.key) else { return nil } |
| 180 | return d |
| 181 | } |
| 182 | |
| 183 | /// Reads `"r` and a count off the front of `keys`. |
| 184 | static func prefix(_ keys: [KeyChord]) -> (register: Character?, count: Int?, rest: ArraySlice<KeyChord>)? { |
| 185 | var rest = keys[...] |
| 186 | var register: Character? |
| 187 | if rest.first?.key == "\"", rest.first?.modifiers.isEmpty == true { |
| 188 | guard rest.count >= 2 else { return nil } |
| 189 | register = rest[rest.startIndex + 1].key == "SPC" ? " " : rest[rest.startIndex + 1].key.first |
| 190 | rest = rest.dropFirst(2) |
| 191 | } |
| 192 | var count: Int? |
| 193 | while let key = rest.first, let d = digit(key), !(d == 0 && count == nil) { |
| 194 | count = (count ?? 0) * 10 + d |
| 195 | rest = rest.dropFirst() |
| 196 | } |
| 197 | return (register, count, rest) |
| 198 | } |
| 199 | |
| 200 | mutating func parse(_ keys: [KeyChord], _ buffer: inout Buffer, _ context: Context) -> Parse { |
| 201 | guard let (register, count, rest) = Self.prefix(keys) else { return .incomplete } |
| 202 | guard let first = rest.first else { return .incomplete } |
| 203 | let visual = mode == .visual || mode == .visualLine |
| 204 | let n = count ?? 1 |
| 205 | let caret = context.caret |
| 206 | |
| 207 | // Operators. |
| 208 | let operatorKeys: [String: String] = ["d": "d", "c": "c", "y": "y", ">": ">", "<": "<"] |
| 209 | var op: String? |
| 210 | var afterOp = rest.dropFirst() |
| 211 | if first.modifiers.isEmpty, let o = operatorKeys[first.key] { |
| 212 | op = o |
| 213 | } else if first.key == "g", first.modifiers.isEmpty { |
| 214 | guard let second = rest.dropFirst().first else { return .incomplete } |
| 215 | if ["~", "u", "U"].contains(second.key), second.modifiers.isEmpty { |
| 216 | op = "g" + second.key |
| 217 | afterOp = rest.dropFirst(2) |
| 218 | } |
| 219 | } |
| 220 | if let op { |
| 221 | if visual { |
| 222 | let range = visualRange(buffer, caret) |
| 223 | return .done(apply(op, range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
| 224 | } |
| 225 | // A second count and the motion. |
| 226 | guard let (_, count2, motionKeys) = Self.prefix(Array(afterOp)), let motionFirst = motionKeys.first else { return .incomplete } |
| 227 | let total = n * (count2 ?? 1) |
| 228 | let doubled = op.count == 1 ? op : String(op.last!) |
| 229 | if motionFirst.key == doubled, motionFirst.modifiers.isEmpty, motionKeys.count == 1 || (op.count == 2 && motionFirst.key == String(op.last!)) { |
| 230 | // dd, cc, yy, >>, <<, g~~, guu, gUU: whole lines. |
| 231 | let startLine = buffer.lineStart(caret) |
| 232 | var end = startLine |
| 233 | for _ in 0..<total { |
| 234 | let next = buffer.lineEnd(end) |
| 235 | end = next < buffer.length ? next + 1 : next |
| 236 | if end >= buffer.length { break } |
| 237 | } |
| 238 | return .done(apply(op, range: startLine..<max(end, buffer.lineEnd(startLine)), linewise: true, buffer, register: register, keys: keys, count: total)) |
| 239 | } |
| 240 | if motionFirst.key == "i" || motionFirst.key == "a", motionFirst.modifiers.isEmpty { |
| 241 | guard motionKeys.count >= 2 else { return .incomplete } |
| 242 | guard let object = textObject(motionFirst.key == "i", motionKeys[motionKeys.startIndex + 1], buffer, caret, count: total) else { return .invalid } |
| 243 | return .done(apply(op, range: object.range, linewise: object.linewise, buffer, register: register, keys: keys, count: total)) |
| 244 | } |
| 245 | var motionCaret = caret |
| 246 | if op == "c", motionFirst.key == "w" || motionFirst.key == "W", motionFirst.modifiers.isEmpty, |
| 247 | let c = buffer.char(caret), !Buffer.isBlank(c) { |
| 248 | // cw acts as ce on a word. |
| 249 | var end = caret |
| 250 | for _ in 0..<total { end = buffer.wordEnd(end, bigWord: motionFirst.key == "W", fromInside: true) } |
| 251 | return .done(apply(op, range: caret..<min(buffer.length, end + 1), linewise: false, buffer, register: register, keys: keys, count: total)) |
| 252 | } |
| 253 | switch motion(Array(motionKeys), &buffer, &motionCaret, count: total, operatorPending: true) { |
| 254 | case .incomplete: return .incomplete |
| 255 | case .invalid: return .invalid |
| 256 | case .moved(let target, let kind): |
| 257 | var range: Range<Int> |
| 258 | var linewise = false |
| 259 | switch kind { |
| 260 | case .linewise: |
| 261 | let a = buffer.lineStart(min(caret, target)) |
| 262 | let b = buffer.lineEnd(max(caret, target)) |
| 263 | range = a..<min(buffer.length, b + 1) |
| 264 | linewise = true |
| 265 | case .inclusive: |
| 266 | range = min(caret, target)..<min(buffer.length, max(caret, target) + 1) |
| 267 | case .exclusive: |
| 268 | range = min(caret, target)..<max(caret, target) |
| 269 | // dw at the end of a line stops at the line's end. |
| 270 | if motionFirst.key == "w" || motionFirst.key == "W", buffer.lineStart(range.upperBound) != buffer.lineStart(range.lowerBound), range.upperBound > range.lowerBound { |
| 271 | var end = buffer.lineEnd(range.lowerBound) |
| 272 | if end == range.lowerBound, total == 1 { end = min(buffer.length, end + 1) } |
| 273 | let upper = buffer.firstNonBlankOrEnd(buffer.lineStart(range.upperBound)) == range.upperBound |
| 274 | ? max(range.lowerBound, min(end, range.upperBound)) : range.upperBound |
| 275 | range = range.lowerBound..<(upper == range.lowerBound ? end : upper) |
| 276 | if buffer.lineStart(range.upperBound) != buffer.lineStart(range.lowerBound) { |
| 277 | range = range.lowerBound..<buffer.lineEnd(range.lowerBound) |
| 278 | } |
| 279 | } |
| 280 | } |
| 281 | return .done(apply(op, range: range, linewise: linewise, buffer, register: register, keys: keys, count: total)) |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | if visual, first.modifiers.isEmpty { |
| 286 | switch first.key { |
| 287 | case "ESC": |
| 288 | mode = .normal |
| 289 | return .done([.move(caret: buffer.clampNormal(caret))]) |
| 290 | case "o": |
| 291 | let old = anchor |
| 292 | anchor = caret |
| 293 | return .done(visualActions(buffer, old)) |
| 294 | case "x": |
| 295 | let range = visualRange(buffer, caret) |
| 296 | return .done(apply("d", range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
| 297 | case "~", "u", "U": |
| 298 | let range = visualRange(buffer, caret) |
| 299 | return .done(apply(first.key == "~" ? "g~" : "g" + first.key, range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
| 300 | case "J": |
| 301 | let range = visualRange(buffer, caret) |
| 302 | let lines = max(2, buffer.lineCount(range.range)) |
| 303 | mode = .normal |
| 304 | return .done(join(buffer, at: range.range.lowerBound, lines: lines, keys: keys)) |
| 305 | case "p", "P": |
| 306 | let range = visualRange(buffer, caret) |
| 307 | guard let (text, linewise) = paste(register, context) else { return .done([]) } |
| 308 | mode = .normal |
| 309 | var replacement = text |
| 310 | if linewise, !range.linewise { replacement = "\n" + text } |
| 311 | if !linewise, range.linewise { replacement += "\n" } |
| 312 | let removed = buffer.substring(range.range) |
| 313 | var actions: [Action] = [.edit([TextEdit(range: range.range, replacement: replacement)], caret: range.range.lowerBound + (linewise ? 0 : max(0, replacement.utf16.count - 1)))] |
| 314 | actions += store(removed, linewise: range.linewise, register: nil, yank: false) |
| 315 | return .done(actions) |
| 316 | case "v": |
| 317 | if mode == .visual { |
| 318 | mode = .normal |
| 319 | return .done([.move(caret: buffer.clampNormal(caret))]) |
| 320 | } |
| 321 | mode = .visual |
| 322 | return .done(visualActions(buffer, caret)) |
| 323 | case "V": |
| 324 | if mode == .visualLine { |
| 325 | mode = .normal |
| 326 | return .done([.move(caret: buffer.clampNormal(caret))]) |
| 327 | } |
| 328 | mode = .visualLine |
| 329 | return .done(visualActions(buffer, caret)) |
| 330 | case "i", "a": |
| 331 | guard rest.count >= 2 else { return .incomplete } |
| 332 | guard let object = textObject(first.key == "i", rest[rest.startIndex + 1], buffer, caret, count: n) else { return .invalid } |
| 333 | if object.linewise { mode = .visualLine } |
| 334 | anchor = object.range.lowerBound |
| 335 | let end = max(object.range.lowerBound, object.range.upperBound - 1) |
| 336 | return .done(visualActions(buffer, end)) |
| 337 | default: |
| 338 | break |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | if !visual { |
| 343 | switch (first.key, first.modifiers) { |
| 344 | case ("i", []), ("a", []), ("I", []), ("A", []), ("o", []), ("O", []): |
| 345 | return .done(enterInsert(first.key, buffer, caret, keys: keys)) |
| 346 | case ("v", []): |
| 347 | mode = .visual |
| 348 | anchor = caret |
| 349 | return .done(visualActions(buffer, caret)) |
| 350 | case ("V", []): |
| 351 | mode = .visualLine |
| 352 | anchor = caret |
| 353 | return .done(visualActions(buffer, caret)) |
| 354 | case ("x", []), ("<delete>", []): |
| 355 | guard let c = buffer.char(caret), c != 10 else { return .done([]) } |
| 356 | let end = min(buffer.lineEnd(caret), caret + n) |
| 357 | return .done(apply("d", range: caret..<end, linewise: false, buffer, register: register, keys: keys, count: n)) |
| 358 | case ("X", []): |
| 359 | let start = max(buffer.lineStart(caret), caret - n) |
| 360 | guard start < caret else { return .done([]) } |
| 361 | return .done(apply("d", range: start..<caret, linewise: false, buffer, register: register, keys: keys, count: n)) |
| 362 | case ("D", []), ("C", []): |
| 363 | var end = buffer.lineEnd(caret) |
| 364 | for _ in 1..<max(1, n) where end < buffer.length { end = buffer.lineEnd(end + 1) } |
| 365 | return .done(apply(first.key == "D" ? "d" : "c", range: caret..<end, linewise: false, buffer, register: register, keys: keys, count: n)) |
| 366 | case ("Y", []): |
| 367 | // `evil-want-Y-yank-to-eol`. |
| 368 | return .done(apply("y", range: caret..<buffer.lineEnd(caret), linewise: false, buffer, register: register, keys: keys, count: n)) |
| 369 | case ("p", []), ("P", []): |
| 370 | guard let (text, linewise) = paste(register, context) else { return .done([]) } |
| 371 | let repeated = String(repeating: text, count: n) |
| 372 | if linewise { |
| 373 | let body = repeated.hasSuffix("\n") ? repeated : repeated + "\n" |
| 374 | if first.key == "p" { |
| 375 | let end = buffer.lineEnd(caret) |
| 376 | if end >= buffer.length { |
| 377 | let insertion = "\n" + String(body.dropLast()) |
| 378 | return .done(change([TextEdit(range: end..<end, replacement: insertion)], caret: buffer.firstNonBlankIn(insertion, at: end + 1), keys: keys)) |
| 379 | } |
| 380 | return .done(change([TextEdit(range: (end + 1)..<(end + 1), replacement: body)], caret: buffer.firstNonBlankIn(body, at: end + 1), keys: keys)) |
| 381 | } |
| 382 | let start = buffer.lineStart(caret) |
| 383 | return .done(change([TextEdit(range: start..<start, replacement: body)], caret: buffer.firstNonBlankIn(body, at: start), keys: keys)) |
| 384 | } |
| 385 | let at = first.key == "p" && buffer.char(caret).map({ $0 != 10 }) == true ? caret + 1 : caret |
| 386 | return .done(change([TextEdit(range: at..<at, replacement: repeated)], caret: at + max(0, repeated.utf16.count - 1), keys: keys)) |
| 387 | case ("J", []): |
| 388 | return .done(join(buffer, at: caret, lines: max(2, n), keys: keys)) |
| 389 | case ("~", []): |
| 390 | let end = min(buffer.lineEnd(caret), caret + n) |
| 391 | guard end > caret else { return .done([]) } |
| 392 | let flipped = String(buffer.substring(caret..<end).map { $0.isUppercase ? Character($0.lowercased()) : Character($0.uppercased()) }) |
| 393 | return .done(change([TextEdit(range: caret..<end, replacement: flipped)], caret: buffer.clampNormal(end, in: buffer.lineStart(caret)), keys: keys)) |
| 394 | case ("r", []): |
| 395 | guard rest.count >= 2 else { return .incomplete } |
| 396 | let target = rest[rest.startIndex + 1] |
| 397 | let char = target.key == "SPC" ? " " : target.key == "RET" ? "\n" : target.key |
| 398 | guard char.count == 1, caret + n <= buffer.lineEnd(caret) else { return .done([]) } |
| 399 | let replacement = char == "\n" ? "\n" : String(repeating: char, count: n) |
| 400 | return .done(change([TextEdit(range: caret..<(caret + n), replacement: replacement)], caret: char == "\n" ? caret + 1 : caret + n - 1, keys: keys)) |
| 401 | case ("u", []): |
| 402 | return .done([.undo(n)]) |
| 403 | case ("r", [.control]): |
| 404 | return .done([.redo(n)]) |
| 405 | case (".", []): |
| 406 | return .done(repeatChange(n, context)) |
| 407 | case (":", []): |
| 408 | return .done([.prompt(":")]) |
| 409 | case ("/", []), ("?", []): |
| 410 | return .done([.prompt(first.key)]) |
| 411 | case ("Z", []): |
| 412 | guard rest.count >= 2 else { return .incomplete } |
| 413 | switch rest[rest.startIndex + 1].key { |
| 414 | case "Z": return .done([.command("app.save")]) |
| 415 | case "Q": return .done([.message("ZQ isn't available; use the window's close button")]) |
| 416 | default: return .invalid |
| 417 | } |
| 418 | default: |
| 419 | break |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | // Motions move the caret, or extend the selection in visual states. |
| 424 | var target = caret |
| 425 | switch motion(Array(rest), &buffer, &target, count: n, operatorPending: false) { |
| 426 | case .incomplete: return .incomplete |
| 427 | case .invalid: return .invalid |
| 428 | case .moved(let to, _): |
| 429 | if visual { return .done(visualActions(buffer, to)) } |
| 430 | return .done([.move(caret: buffer.clampNormal(to))]) |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | // MARK: - Motions |
| 435 | |
| 436 | enum MotionKind { case exclusive, inclusive, linewise } |
| 437 | |
| 438 | enum MotionResult { |
| 439 | case incomplete |
| 440 | case invalid |
| 441 | case moved(Int, MotionKind) |
| 442 | } |
| 443 | |
| 444 | mutating func motion(_ keys: [KeyChord], _ buffer: inout Buffer, _ caret: inout Int, count n: Int, operatorPending: Bool) -> MotionResult { |
| 445 | guard let key = keys.first else { return .incomplete } |
| 446 | let c = caret |
| 447 | func column(_ position: Int) -> Int { position - buffer.lineStart(position) } |
| 448 | switch (key.key, key.modifiers) { |
| 449 | case ("h", []), ("<left>", []), ("DEL", []): |
| 450 | goalColumn = nil |
| 451 | return .moved(max(buffer.lineStart(c), c - n), .exclusive) |
| 452 | case ("l", []), ("<right>", []), ("SPC", []): |
| 453 | goalColumn = nil |
| 454 | let end = buffer.lineEnd(c) |
| 455 | let limit = operatorPending ? end : max(buffer.lineStart(c), end - 1) |
| 456 | return .moved(min(limit, c + n), .exclusive) |
| 457 | case ("j", []), ("k", []), ("<down>", []), ("<up>", []), ("d", [.control]), ("u", [.control]), ("+", []), ("-", []), ("RET", []): |
| 458 | let down = ["j", "<down>", "+", "RET"].contains(key.key) || key == KeyChord("d", .control) |
| 459 | let lines = key.modifiers.contains(.control) ? (n == 1 ? 15 : n) : n |
| 460 | let goal = goalColumn ?? column(c) |
| 461 | var line = buffer.lineStart(c) |
| 462 | var moved = 0 |
| 463 | for _ in 0..<lines { |
| 464 | if down { |
| 465 | let end = buffer.lineEnd(line) |
| 466 | guard end < buffer.length, end + 1 <= buffer.length else { break } |
| 467 | if end + 1 == buffer.length { break } |
| 468 | line = end + 1 |
| 469 | } else { |
| 470 | guard line > 0 else { break } |
| 471 | line = buffer.lineStart(line - 1) |
| 472 | } |
| 473 | moved += 1 |
| 474 | } |
| 475 | if moved == 0, !key.modifiers.contains(.control) { return .invalid } |
| 476 | if ["+", "-", "RET"].contains(key.key) { return .moved(buffer.firstNonBlank(line), .linewise) } |
| 477 | goalColumn = goal |
| 478 | let length = buffer.lineEnd(line) - line |
| 479 | return .moved(line + min(goal, operatorPending ? length : max(0, length - 1)), .linewise) |
| 480 | case ("w", []), ("W", []): |
| 481 | goalColumn = nil |
| 482 | var p = c |
| 483 | for _ in 0..<n { p = buffer.wordForward(p, bigWord: key.key == "W") } |
| 484 | return .moved(p, .exclusive) |
| 485 | case ("b", []), ("B", []): |
| 486 | goalColumn = nil |
| 487 | var p = c |
| 488 | for _ in 0..<n { p = buffer.wordBackward(p, bigWord: key.key == "B", stopAtLine: false) } |
| 489 | return .moved(p, .exclusive) |
| 490 | case ("e", []), ("E", []): |
| 491 | goalColumn = nil |
| 492 | var p = c |
| 493 | for _ in 0..<n { p = buffer.wordEnd(p, bigWord: key.key == "E", fromInside: false) } |
| 494 | return .moved(p, .inclusive) |
| 495 | case ("0", []), ("<home>", []): |
| 496 | goalColumn = nil |
| 497 | return .moved(buffer.lineStart(c), .exclusive) |
| 498 | case ("^", []): |
| 499 | goalColumn = nil |
| 500 | return .moved(buffer.firstNonBlank(buffer.lineStart(c)), .exclusive) |
| 501 | case ("$", []), ("<end>", []): |
| 502 | var line = buffer.lineStart(c) |
| 503 | for _ in 1..<max(1, n) where buffer.lineEnd(line) < buffer.length { line = buffer.lineEnd(line) + 1 } |
| 504 | goalColumn = Int.max |
| 505 | let end = buffer.lineEnd(line) |
| 506 | if mode == .visual { return .moved(end, .inclusive) } |
| 507 | return .moved(max(line, end - 1), .inclusive) |
| 508 | case ("G", []): |
| 509 | // `evil-start-of-line` nil: the column stays. |
| 510 | let line = n > 1 || keys.count > 1 ? buffer.lineOffset(n) : buffer.lineStart(buffer.length) |
| 511 | let column = c - buffer.lineStart(c) |
| 512 | let length = buffer.lineEnd(line) - line |
| 513 | return .moved(line + min(column, operatorPending ? length : max(0, length - 1)), .linewise) |
| 514 | case ("g", []): |
| 515 | guard keys.count >= 2 else { return .incomplete } |
| 516 | switch keys[1].key { |
| 517 | case "g": |
| 518 | let line = buffer.lineOffset(n) |
| 519 | let column = c - buffer.lineStart(c) |
| 520 | let length = buffer.lineEnd(line) - line |
| 521 | return .moved(line + min(column, operatorPending ? length : max(0, length - 1)), .linewise) |
| 522 | case "e", "E": |
| 523 | var p = c |
| 524 | for _ in 0..<n { p = buffer.wordEndBackward(p, bigWord: keys[1].key == "E") } |
| 525 | return .moved(p, .inclusive) |
| 526 | case "j": |
| 527 | return motion([KeyChord("j")], &buffer, &caret, count: n, operatorPending: operatorPending) |
| 528 | case "k": |
| 529 | return motion([KeyChord("k")], &buffer, &caret, count: n, operatorPending: operatorPending) |
| 530 | case "_": |
| 531 | let end = buffer.lineEnd(c) |
| 532 | var p = end |
| 533 | while p > buffer.lineStart(c), let ch = buffer.char(p - 1), Buffer.isBlank(ch) { p -= 1 } |
| 534 | return .moved(max(buffer.lineStart(c), p - 1), .inclusive) |
| 535 | default: |
| 536 | return .invalid |
| 537 | } |
| 538 | case ("f", []), ("F", []), ("t", []), ("T", []): |
| 539 | guard keys.count >= 2 else { return .incomplete } |
| 540 | let char = keys[1].key == "SPC" ? " " : keys[1].key |
| 541 | guard char.count == 1 else { return .invalid } |
| 542 | lastFind = (Character(key.key), char) |
| 543 | guard let p = find(Character(key.key), char, buffer, c, count: n) else { return .invalid } |
| 544 | return .moved(p, key.key == "f" || key.key == "t" ? .inclusive : .exclusive) |
| 545 | case (";", []), (",", []): |
| 546 | guard let last = lastFind else { return .invalid } |
| 547 | var kind = last.kind |
| 548 | if key.key == "," { |
| 549 | kind = ["f": "F", "F": "f", "t": "T", "T": "t"][kind]! |
| 550 | } |
| 551 | guard let p = find(kind, last.char, buffer, c, count: n, repeating: true) else { return .invalid } |
| 552 | return .moved(p, kind == "f" || kind == "t" ? .inclusive : .exclusive) |
| 553 | case ("s", []), ("S", []) where !operatorPending: |
| 554 | // evil-snipe with `evil-snipe-scope` line. |
| 555 | guard keys.count >= 3 else { return .incomplete } |
| 556 | let chars = keys[1].key + keys[2].key |
| 557 | lastSnipe = (key.key == "s", chars) |
| 558 | guard let p = snipe(forward: key.key == "s", chars, buffer, c, count: n) else { return .invalid } |
| 559 | return .moved(p, .exclusive) |
| 560 | case ("%", []): |
| 561 | guard let p = buffer.matchingBracket(c) else { return .invalid } |
| 562 | return .moved(p, .inclusive) |
| 563 | case ("}", []), ("{", []): |
| 564 | var p = c |
| 565 | for _ in 0..<n { p = buffer.paragraph(p, forward: key.key == "}") } |
| 566 | return .moved(p, .exclusive) |
| 567 | case ("n", []), ("N", []): |
| 568 | guard let search = lastSearch else { return .invalid } |
| 569 | let forward = key.key == "n" ? search.forward : !search.forward |
| 570 | guard let p = buffer.search(search.pattern, from: c, forward: forward, count: n) else { return .invalid } |
| 571 | return .moved(p, .exclusive) |
| 572 | case ("*", []), ("#", []): |
| 573 | guard let word = buffer.wordAt(c) else { return .invalid } |
| 574 | let pattern = "\\b" + NSRegularExpression.escapedPattern(for: word) + "\\b" |
| 575 | lastSearch = (pattern, key.key == "*") |
| 576 | guard let p = buffer.search(pattern, from: buffer.wordStart(c), forward: key.key == "*", count: n) else { return .invalid } |
| 577 | return .moved(p, .exclusive) |
| 578 | default: |
| 579 | return .invalid |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | func find(_ kind: Character, _ char: String, _ buffer: Buffer, _ c: Int, count n: Int, repeating: Bool = false) -> Int? { |
| 584 | let target = char.utf16.first! |
| 585 | let forward = kind == "f" || kind == "t" |
| 586 | var p = c |
| 587 | for i in 0..<n { |
| 588 | var q = p |
| 589 | // Repeating t/T starts past the character it stopped before. |
| 590 | let skip = repeating && i == 0 && (kind == "t" || kind == "T") ? 1 : 0 |
| 591 | if forward { |
| 592 | q += 1 + skip |
| 593 | while q < buffer.lineEnd(c), buffer.char(q) != target { q += 1 } |
| 594 | guard q < buffer.lineEnd(c) else { return nil } |
| 595 | } else { |
| 596 | q -= 1 + skip |
| 597 | while q >= buffer.lineStart(c), buffer.char(q) != target { q -= 1 } |
| 598 | guard q >= buffer.lineStart(c) else { return nil } |
| 599 | } |
| 600 | p = q |
| 601 | } |
| 602 | if kind == "t" { return p - 1 } |
| 603 | if kind == "T" { return p + 1 } |
| 604 | return p |
| 605 | } |
| 606 | |
| 607 | func snipe(forward: Bool, _ chars: String, _ buffer: Buffer, _ c: Int, count n: Int) -> Int? { |
| 608 | let line = buffer.substring(buffer.lineStart(c)..<buffer.lineEnd(c)) as NSString |
| 609 | let start = buffer.lineStart(c) |
| 610 | let smart = chars == chars.lowercased() |
| 611 | var p = c - start |
| 612 | for _ in 0..<n { |
| 613 | let range: NSRange |
| 614 | if forward { |
| 615 | guard p + 1 < line.length else { return nil } |
| 616 | range = line.range(of: chars, options: smart ? .caseInsensitive : [], range: NSRange(location: p + 1, length: line.length - p - 1)) |
| 617 | } else { |
| 618 | guard p > 0 else { return nil } |
| 619 | range = line.range(of: chars, options: smart ? [.caseInsensitive, .backwards] : .backwards, range: NSRange(location: 0, length: p)) |
| 620 | } |
| 621 | guard range.location != NSNotFound else { return nil } |
| 622 | p = range.location |
| 623 | } |
| 624 | return start + p |
| 625 | } |
| 626 | |
| 627 | // MARK: - Text objects |
| 628 | |
| 629 | func textObject(_ inner: Bool, _ key: KeyChord, _ buffer: Buffer, _ c: Int, count: Int) -> (range: Range<Int>, linewise: Bool)? { |
| 630 | switch key.key { |
| 631 | case "w", "W": |
| 632 | return buffer.wordObject(c, inner: inner, bigWord: key.key == "W", count: count).map { ($0, false) } |
| 633 | case "\"", "'", "`": |
| 634 | return buffer.quoteObject(c, quote: key.key.utf16.first!, inner: inner).map { ($0, false) } |
| 635 | case "(", ")", "b": |
| 636 | return buffer.bracketObject(c, open: 40, close: 41, inner: inner).map { ($0, false) } |
| 637 | case "[", "]": |
| 638 | return buffer.bracketObject(c, open: 91, close: 93, inner: inner).map { ($0, false) } |
| 639 | case "{", "}", "B": |
| 640 | return buffer.bracketObject(c, open: 123, close: 125, inner: inner).map { ($0, false) } |
| 641 | case "<", ">": |
| 642 | return buffer.bracketObject(c, open: 60, close: 62, inner: inner).map { ($0, false) } |
| 643 | case "p": |
| 644 | return buffer.paragraphObject(c, inner: inner).map { ($0, true) } |
| 645 | default: |
| 646 | return nil |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | // MARK: - Applying |
| 651 | |
| 652 | func visualRange(_ buffer: Buffer, _ caret: Int) -> (range: Range<Int>, linewise: Bool) { |
| 653 | let a = min(anchor, caret) |
| 654 | let b = max(anchor, caret) |
| 655 | if mode == .visualLine { |
| 656 | let end = buffer.lineEnd(b) |
| 657 | return (buffer.lineStart(a)..<min(buffer.length, end + 1), true) |
| 658 | } |
| 659 | return (a..<min(buffer.length, b + 1), false) |
| 660 | } |
| 661 | |
| 662 | func visualActions(_ buffer: Buffer, _ caret: Int) -> [Action] { |
| 663 | let a = min(anchor, caret) |
| 664 | let b = max(anchor, caret) |
| 665 | let range = mode == .visualLine ? buffer.lineStart(a)..<buffer.lineEnd(b) : a..<min(buffer.length, b + 1) |
| 666 | return [.move(caret: caret), .select(range)] |
| 667 | } |
| 668 | |
| 669 | mutating func store(_ text: String, linewise: Bool, register: Character?, yank: Bool) -> [Action] { |
| 670 | if register == "_" { return [] } |
| 671 | if let register, register.isLetter { |
| 672 | let key = Character(register.lowercased()) |
| 673 | if register.isUppercase, let existing = registers[key] { |
| 674 | registers[key] = (existing.text + text, existing.linewise || linewise) |
| 675 | } else { |
| 676 | registers[key] = (text, linewise) |
| 677 | } |
| 678 | return [] |
| 679 | } |
| 680 | if yank { registers["0"] = (text, linewise) } |
| 681 | clipboardRecord = (text, linewise) |
| 682 | return [.setClipboard(text)] |
| 683 | } |
| 684 | |
| 685 | func paste(_ register: Character?, _ context: Context) -> (String, Bool)? { |
| 686 | if let register, register != "\"", register != "+", register != "*" { |
| 687 | return registers[Character(register.lowercased())] |
| 688 | } |
| 689 | guard let clip = context.clipboard ?? clipboardRecord?.text else { return nil } |
| 690 | if let record = clipboardRecord, record.text == clip { return (clip, record.linewise) } |
| 691 | return (clip, false) |
| 692 | } |
| 693 | |
| 694 | mutating func change(_ edits: [TextEdit], caret: Int, keys: [KeyChord]) -> [Action] { |
| 695 | lastChange = (keys, nil) |
| 696 | return [.edit(edits, caret: caret)] |
| 697 | } |
| 698 | |
| 699 | mutating func apply(_ op: String, range: Range<Int>, linewise: Bool, _ buffer: Buffer, register: Character?, keys: [KeyChord], count: Int) -> [Action] { |
| 700 | let wasVisual = mode == .visual || mode == .visualLine |
| 701 | let context0Column = max(0, caretForApply - buffer.lineStart(caretForApply)) |
| 702 | mode = .normal |
| 703 | let text = buffer.substring(range) |
| 704 | switch op { |
| 705 | case "y": |
| 706 | var actions = store(text, linewise: linewise, register: register, yank: true) |
| 707 | let caret = linewise && !wasVisual ? min(range.lowerBound, buffer.length) : range.lowerBound |
| 708 | actions.append(.move(caret: linewise && wasVisual ? buffer.lineStart(range.lowerBound) : caret)) |
| 709 | return actions |
| 710 | case "d": |
| 711 | var actions = store(text, linewise: linewise, register: register, yank: false) |
| 712 | var deletion = range |
| 713 | if linewise, range.upperBound >= buffer.length, range.lowerBound > 0, buffer.char(range.upperBound - 1) != 10 || range.upperBound == buffer.length { |
| 714 | // The last line takes the newline before it. |
| 715 | if buffer.char(range.lowerBound - 1) == 10, range.upperBound == buffer.length, !(text.hasSuffix("\n")) { |
| 716 | deletion = (range.lowerBound - 1)..<range.upperBound |
| 717 | } |
| 718 | } |
| 719 | let after = buffer.removing(deletion) |
| 720 | var caret = deletion.lowerBound |
| 721 | if linewise { |
| 722 | let column = context0Column |
| 723 | let line = after.lineStart(min(deletion.lowerBound, after.length)) |
| 724 | let length = after.lineEnd(line) - line |
| 725 | caret = line + min(column, max(0, length - 1)) |
| 726 | } else { |
| 727 | caret = after.clampNormal(caret) |
| 728 | } |
| 729 | lastChange = (wasVisual ? [] : keys, nil) |
| 730 | actions.insert(.edit([TextEdit(range: deletion, replacement: "")], caret: caret), at: 0) |
| 731 | return actions |
| 732 | case "c": |
| 733 | var actions = store(text, linewise: linewise, register: register, yank: false) |
| 734 | var deletion = range |
| 735 | var replacement = "" |
| 736 | if linewise { |
| 737 | // cc keeps the newline and indents as the line before it calls for. |
| 738 | replacement = range.lowerBound == 0 ? "" : Self.indentation(for: buffer, line: range.lowerBound - 1) |
| 739 | if buffer.char(range.upperBound - 1) == 10 { deletion = range.lowerBound..<(range.upperBound - 1) } |
| 740 | } |
| 741 | let caret = deletion.lowerBound + replacement.utf16.count |
| 742 | actions.insert(.edit([TextEdit(range: deletion, replacement: replacement)], caret: caret), at: 0) |
| 743 | enterInsert(at: caret, keys: wasVisual ? [] : keys) |
| 744 | return actions |
| 745 | case ">", "<": |
| 746 | let start = buffer.lineStart(range.lowerBound) |
| 747 | var edits: [TextEdit] = [] |
| 748 | var line = start |
| 749 | let end = linewise ? range.upperBound : max(range.upperBound, buffer.lineEnd(max(range.lowerBound, range.upperBound - 1))) |
| 750 | while line < end || (line == start && line <= buffer.length) { |
| 751 | let lineEnd = buffer.lineEnd(line) |
| 752 | if lineEnd > line { |
| 753 | if op == ">" { |
| 754 | edits.append(TextEdit(range: line..<line, replacement: String(repeating: " ", count: Self.shiftWidth))) |
| 755 | } else { |
| 756 | let indent = buffer.substring(line..<buffer.firstNonBlankOrEnd(line)) |
| 757 | let remove = min(Self.shiftWidth, indent.count) |
| 758 | if remove > 0 { edits.append(TextEdit(range: line..<(line + remove), replacement: "")) } |
| 759 | } |
| 760 | } |
| 761 | guard lineEnd < buffer.length else { break } |
| 762 | line = lineEnd + 1 |
| 763 | if line >= end { break } |
| 764 | } |
| 765 | lastChange = (wasVisual ? [] : keys, nil) |
| 766 | return [.edit(edits, caret: start)] |
| 767 | default: |
| 768 | let transformed: String |
| 769 | switch op { |
| 770 | case "gu": transformed = text.lowercased() |
| 771 | case "gU": transformed = text.uppercased() |
| 772 | default: transformed = String(text.map { $0.isUppercase ? Character($0.lowercased()) : Character($0.uppercased()) }) |
| 773 | } |
| 774 | lastChange = (wasVisual ? [] : keys, nil) |
| 775 | return [.edit([TextEdit(range: range, replacement: transformed)], caret: range.lowerBound)] |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | mutating func enterInsert(_ key: String, _ buffer: Buffer, _ caret: Int, keys: [KeyChord]) -> [Action] { |
| 780 | switch key { |
| 781 | case "i": |
| 782 | enterInsert(at: caret, keys: keys) |
| 783 | return [.move(caret: caret)] |
| 784 | case "a": |
| 785 | let p = buffer.char(caret).map { $0 != 10 } == true ? caret + 1 : caret |
| 786 | enterInsert(at: p, keys: keys) |
| 787 | return [.move(caret: p)] |
| 788 | case "I": |
| 789 | let p = buffer.firstNonBlank(buffer.lineStart(caret)) |
| 790 | enterInsert(at: p, keys: keys) |
| 791 | return [.move(caret: p)] |
| 792 | case "A": |
| 793 | let p = buffer.lineEnd(caret) |
| 794 | enterInsert(at: p, keys: keys) |
| 795 | return [.move(caret: p)] |
| 796 | case "o": |
| 797 | let end = buffer.lineEnd(caret) |
| 798 | let indent = Self.indentation(for: buffer, line: caret) |
| 799 | enterInsert(at: end + 1 + indent.utf16.count, keys: keys) |
| 800 | return [.edit([TextEdit(range: end..<end, replacement: "\n" + indent)], caret: end + 1 + indent.utf16.count)] |
| 801 | default: |
| 802 | let start = buffer.lineStart(caret) |
| 803 | let indent = Self.indentation(for: buffer, line: max(0, start - 1)) == "" || start == 0 ? "" : Self.indentation(for: buffer, line: start - 1) |
| 804 | enterInsert(at: start + indent.utf16.count, keys: keys) |
| 805 | return [.edit([TextEdit(range: start..<start, replacement: indent + "\n")], caret: start + indent.utf16.count)] |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | mutating func join(_ buffer: Buffer, at caret: Int, lines: Int, keys: [KeyChord]) -> [Action] { |
| 810 | var edits: [TextEdit] = [] |
| 811 | var line = buffer.lineStart(caret) |
| 812 | var position = caret |
| 813 | for _ in 1..<lines { |
| 814 | let end = buffer.lineEnd(line) |
| 815 | guard end < buffer.length else { break } |
| 816 | let nextStart = end + 1 |
| 817 | let nextText = buffer.firstNonBlankOrEnd(nextStart) |
| 818 | let joinsEmpty = buffer.lineEnd(nextStart) == nextText |
| 819 | let separator = joinsEmpty || buffer.char(nextText) == 41 ? "" : (end > line && buffer.char(end - 1) == 32 ? "" : " ") |
| 820 | var from = end |
| 821 | while from > line, let c = buffer.char(from - 1), c == 32 || c == 9 { from -= 1 } |
| 822 | if !separator.isEmpty || from == end { from = end } |
| 823 | edits.append(TextEdit(range: from..<nextText, replacement: separator)) |
| 824 | position = from |
| 825 | line = nextStart |
| 826 | } |
| 827 | guard !edits.isEmpty else { return [] } |
| 828 | lastChange = (keys, nil) |
| 829 | // Positions in edits refer to the original text; apply back to front. |
| 830 | let shift = edits.dropLast().reduce(0) { $0 + $1.replacement.utf16.count - $1.range.count } |
| 831 | return [.edit(edits, caret: position + shift)] |
| 832 | } |
| 833 | |
| 834 | mutating func repeatChange(_ count: Int, _ context: Context) -> [Action] { |
| 835 | guard let change = lastChange, !change.keys.isEmpty else { return [] } |
| 836 | var copy = self |
| 837 | copy.lastChange = nil |
| 838 | copy.pending = [] |
| 839 | var keys = change.keys |
| 840 | if count > 1, let (_, _, rest) = Self.prefix(keys) { |
| 841 | keys = Array("\(count)".map { KeyChord(String($0)) }) + Array(rest) |
| 842 | } |
| 843 | var actions: [Action] = [] |
| 844 | var text = context.text |
| 845 | var caret = context.caret |
| 846 | for key in keys { |
| 847 | if copy.mode == .insert, key == KeyChord("ESC") { |
| 848 | if let inserted = change.inserted, !inserted.isEmpty { |
| 849 | let edit = TextEdit(range: caret..<caret, replacement: inserted) |
| 850 | actions.append(.edit([edit], caret: caret + inserted.utf16.count)) |
| 851 | text = edit.apply(to: text) |
| 852 | caret += inserted.utf16.count |
| 853 | } |
| 854 | } |
| 855 | let produced = copy.feed(key, Context(text: text, caret: caret, clipboard: context.clipboard, halfPage: context.halfPage)) |
| 856 | for action in produced { |
| 857 | switch action { |
| 858 | case .edit(let edits, let to): |
| 859 | var new = text |
| 860 | for edit in edits.sorted(by: { $0.range.lowerBound > $1.range.lowerBound }) { new = edit.apply(to: new) } |
| 861 | text = new |
| 862 | caret = to |
| 863 | case .move(let to): |
| 864 | caret = to |
| 865 | default: |
| 866 | break |
| 867 | } |
| 868 | actions.append(action) |
| 869 | } |
| 870 | } |
| 871 | let preserved = (registers, clipboardRecord) |
| 872 | self = copy |
| 873 | registers = preserved.0 |
| 874 | clipboardRecord = copy.clipboardRecord ?? preserved.1 |
| 875 | lastChange = change |
| 876 | return actions |
| 877 | } |
| 878 | |
| 879 | /// `/pattern` or `?pattern` from the prompt: the caret's new place. |
| 880 | public mutating func search(_ pattern: String, forward: Bool, _ context: Context) -> [Action] { |
| 881 | lastSearch = (pattern, forward) |
| 882 | let buffer = Buffer(context) |
| 883 | guard let p = buffer.search(pattern, from: context.caret, forward: forward, count: 1) else { return [.message("Search failed: \(pattern)")] } |
| 884 | if mode == .visual || mode == .visualLine { return visualActions(buffer, p) } |
| 885 | return [.move(caret: p)] |
| 886 | } |
| 887 | |
| 888 | /// Leave a visual state without acting, as `ESC` does. |
| 889 | public mutating func reset() { |
| 890 | pending = [] |
| 891 | if mode == .visual || mode == .visualLine { mode = .normal } |
| 892 | } |
| 893 | |
| 894 | // MARK: - Text |
| 895 | |
| 896 | struct Buffer { |
| 897 | let ns: NSString |
| 898 | var length: Int { ns.length } |
| 899 | |
| 900 | init(_ context: Context) { ns = context.text as NSString } |
| 901 | init(_ text: String) { ns = text as NSString } |
| 902 | |
| 903 | func char(_ i: Int) -> unichar? { i >= 0 && i < ns.length ? ns.character(at: i) : nil } |
| 904 | func substring(_ r: Range<Int>) -> String { ns.substring(with: NSRange(location: r.lowerBound, length: r.count)) } |
| 905 | func lineStart(_ i: Int) -> Int { ns.lineRange(for: NSRange(location: min(i, ns.length), length: 0)).location } |
| 906 | func lineEnd(_ i: Int) -> Int { |
| 907 | var end = 0 |
| 908 | ns.getLineStart(nil, end: nil, contentsEnd: &end, for: NSRange(location: min(i, ns.length), length: 0)) |
| 909 | return end |
| 910 | } |
| 911 | func removing(_ r: Range<Int>) -> Buffer { Buffer(ns.replacingCharacters(in: NSRange(location: r.lowerBound, length: r.count), with: "")) } |
| 912 | func applying(_ edits: [TextEdit]) -> Buffer { |
| 913 | var text = ns as String |
| 914 | for edit in edits.sorted(by: { $0.range.lowerBound > $1.range.lowerBound }) { text = edit.apply(to: text) } |
| 915 | return Buffer(text) |
| 916 | } |
| 917 | |
| 918 | static func isBlank(_ c: unichar) -> Bool { c == 32 || c == 9 } |
| 919 | static func isSpace(_ c: unichar) -> Bool { c == 32 || c == 9 || c == 10 || c == 13 } |
| 920 | static func isWord(_ c: unichar) -> Bool { |
| 921 | guard let scalar = Unicode.Scalar(c) else { return true } |
| 922 | return CharacterSet.alphanumerics.contains(scalar) || c == 95 |
| 923 | } |
| 924 | |
| 925 | /// 0 blank, 1 word, 2 other. |
| 926 | func kind(_ i: Int, bigWord: Bool) -> Int { |
| 927 | guard let c = char(i) else { return 0 } |
| 928 | if Self.isSpace(c) { return 0 } |
| 929 | if bigWord { return 1 } |
| 930 | return Self.isWord(c) ? 1 : 2 |
| 931 | } |
| 932 | |
| 933 | func clampNormal(_ i: Int) -> Int { clampNormal(i, in: lineStart(i)) } |
| 934 | func clampNormal(_ i: Int, in line: Int) -> Int { |
| 935 | let end = lineEnd(line) |
| 936 | return max(line, min(i, end > line ? end - 1 : line)) |
| 937 | } |
| 938 | |
| 939 | func firstNonBlank(_ line: Int) -> Int { |
| 940 | var p = line |
| 941 | let end = lineEnd(line) |
| 942 | while p < end, let c = char(p), Self.isBlank(c) { p += 1 } |
| 943 | return p == end && end > line ? end - 1 : (p == end ? line : p) |
| 944 | } |
| 945 | |
| 946 | func firstNonBlankOrEnd(_ line: Int) -> Int { |
| 947 | var p = line |
| 948 | let end = lineEnd(line) |
| 949 | while p < end, let c = char(p), Self.isBlank(c) { p += 1 } |
| 950 | return p |
| 951 | } |
| 952 | |
| 953 | func firstNonBlankIn(_ inserted: String, at start: Int) -> Int { |
| 954 | start + inserted.prefix { $0 == " " || $0 == "\t" }.utf16.count |
| 955 | } |
| 956 | |
| 957 | func lineOffset(_ number: Int) -> Int { |
| 958 | var line = 0 |
| 959 | for _ in 1..<max(1, number) { |
| 960 | let end = lineEnd(line) |
| 961 | guard end < length, end + 1 < length else { break } |
| 962 | line = end + 1 |
| 963 | } |
| 964 | return line |
| 965 | } |
| 966 | |
| 967 | func lineCount(_ r: Range<Int>) -> Int { |
| 968 | substring(r).filter { $0 == "\n" }.count + (r.upperBound > 0 && char(r.upperBound - 1) == 10 ? 0 : 1) |
| 969 | } |
| 970 | |
| 971 | func wordForward(_ c: Int, bigWord: Bool) -> Int { |
| 972 | var p = c |
| 973 | let k = kind(p, bigWord: bigWord) |
| 974 | if k != 0 { while p < length, kind(p, bigWord: bigWord) == k { p += 1 } } |
| 975 | // Skip blanks; an empty line is a word. |
| 976 | while p < length, kind(p, bigWord: bigWord) == 0 { |
| 977 | if char(p) == 10, p > c, char(p - 1) == 10 { return p } |
| 978 | if char(p) == 10, p + 1 < length, char(p + 1) == 10, p + 1 > c { return p + 1 } |
| 979 | p += 1 |
| 980 | } |
| 981 | return min(p, length) |
| 982 | } |
| 983 | |
| 984 | func wordBackward(_ c: Int, bigWord: Bool, stopAtLine: Bool) -> Int { |
| 985 | var p = c |
| 986 | guard p > 0 else { return 0 } |
| 987 | p -= 1 |
| 988 | while p > 0, kind(p, bigWord: bigWord) == 0 { |
| 989 | if char(p) == 10, char(p - 1) == 10, !stopAtLine { return p } |
| 990 | if stopAtLine, char(p) == 10 { return p + 1 } |
| 991 | p -= 1 |
| 992 | } |
| 993 | let k = kind(p, bigWord: bigWord) |
| 994 | while p > 0, kind(p - 1, bigWord: bigWord) == k, k != 0 { p -= 1 } |
| 995 | return p |
| 996 | } |
| 997 | |
| 998 | func wordEnd(_ c: Int, bigWord: Bool, fromInside: Bool) -> Int { |
| 999 | var p = fromInside ? c : c + 1 |
| 1000 | while p < length, kind(p, bigWord: bigWord) == 0 { p += 1 } |
| 1001 | let k = kind(p, bigWord: bigWord) |
| 1002 | while p + 1 < length, kind(p + 1, bigWord: bigWord) == k, k != 0 { p += 1 } |
| 1003 | return min(p, max(0, length - 1)) |
| 1004 | } |
| 1005 | |
| 1006 | func wordEndBackward(_ c: Int, bigWord: Bool) -> Int { |
| 1007 | var p = c |
| 1008 | let k = kind(p, bigWord: bigWord) |
| 1009 | while p > 0, kind(p, bigWord: bigWord) == k, k != 0 { p -= 1 } |
| 1010 | while p > 0, kind(p, bigWord: bigWord) == 0 { p -= 1 } |
| 1011 | return p |
| 1012 | } |
| 1013 | |
| 1014 | func wordStart(_ c: Int) -> Int { |
| 1015 | var p = c |
| 1016 | while p > 0, let ch = char(p - 1), Self.isWord(ch) { p -= 1 } |
| 1017 | return p |
| 1018 | } |
| 1019 | |
| 1020 | func wordAt(_ c: Int) -> String? { |
| 1021 | var p = c |
| 1022 | while p < lineEnd(c), let ch = char(p), !Self.isWord(ch) { p += 1 } |
| 1023 | guard let ch = char(p), Self.isWord(ch) else { return nil } |
| 1024 | let start = wordStart(p) |
| 1025 | var end = p |
| 1026 | while end < length, let e = char(end), Self.isWord(e) { end += 1 } |
| 1027 | return substring(start..<end) |
| 1028 | } |
| 1029 | |
| 1030 | func matchingBracket(_ c: Int) -> Int? { |
| 1031 | let pairs: [unichar: (unichar, Bool)] = [40: (41, true), 91: (93, true), 123: (125, true), 41: (40, false), 93: (91, false), 125: (123, false)] |
| 1032 | var p = c |
| 1033 | let end = lineEnd(c) |
| 1034 | while p < end, let ch = char(p), pairs[ch] == nil { p += 1 } |
| 1035 | guard let open = char(p), let (close, forward) = pairs[open] else { return nil } |
| 1036 | var depth = 0 |
| 1037 | var q = p |
| 1038 | while q >= 0, q < length { |
| 1039 | if char(q) == open { depth += 1 } |
| 1040 | if char(q) == close { |
| 1041 | depth -= 1 |
| 1042 | if depth == 0 { return q } |
| 1043 | } |
| 1044 | q += forward ? 1 : -1 |
| 1045 | } |
| 1046 | return nil |
| 1047 | } |
| 1048 | |
| 1049 | func paragraph(_ c: Int, forward: Bool) -> Int { |
| 1050 | func blank(_ line: Int) -> Bool { substring(line..<lineEnd(line)).allSatisfy { $0 == " " || $0 == "\t" } } |
| 1051 | var line = lineStart(c) |
| 1052 | if forward { |
| 1053 | while lineEnd(line) < length, blank(line) { line = lineEnd(line) + 1 } |
| 1054 | while lineEnd(line) < length { |
| 1055 | line = lineEnd(line) + 1 |
| 1056 | if blank(line) { return line } |
| 1057 | } |
| 1058 | return max(0, length - (length > 0 && char(length - 1) == 10 ? 1 : 0)) |
| 1059 | } |
| 1060 | while line > 0, blank(line) { line = lineStart(line - 1) } |
| 1061 | while line > 0 { |
| 1062 | line = lineStart(line - 1) |
| 1063 | if blank(line) { return line } |
| 1064 | } |
| 1065 | return 0 |
| 1066 | } |
| 1067 | |
| 1068 | func search(_ pattern: String, from c: Int, forward: Bool, count: Int) -> Int? { |
| 1069 | guard let regex = try? NSRegularExpression(pattern: pattern) else { return nil } |
| 1070 | let all = regex.matches(in: ns as String, range: NSRange(location: 0, length: length)).map(\.range.location) |
| 1071 | guard !all.isEmpty else { return nil } |
| 1072 | var p = c |
| 1073 | for _ in 0..<count { |
| 1074 | if forward { |
| 1075 | p = all.first { $0 > p } ?? all[0] |
| 1076 | } else { |
| 1077 | p = all.last { $0 < p } ?? all[all.count - 1] |
| 1078 | } |
| 1079 | } |
| 1080 | return p |
| 1081 | } |
| 1082 | |
| 1083 | func wordObject(_ c: Int, inner: Bool, bigWord: Bool, count: Int) -> Range<Int>? { |
| 1084 | guard c < length else { return nil } |
| 1085 | var start = c |
| 1086 | var end = c |
| 1087 | let k = kind(c, bigWord: bigWord) |
| 1088 | let lineS = lineStart(c) |
| 1089 | let lineE = lineEnd(c) |
| 1090 | while start > lineS, kind(start - 1, bigWord: bigWord) == k, char(start - 1) != 10 { start -= 1 } |
| 1091 | while end < lineE, kind(end, bigWord: bigWord) == k { end += 1 } |
| 1092 | if inner { |
| 1093 | for _ in 1..<max(1, count) { |
| 1094 | let k2 = kind(end, bigWord: bigWord) |
| 1095 | while end < lineE, kind(end, bigWord: bigWord) == k2 { end += 1 } |
| 1096 | } |
| 1097 | return start..<end |
| 1098 | } |
| 1099 | for _ in 1..<max(1, count) { |
| 1100 | while end < lineE, let ch = char(end), Self.isBlank(ch) { end += 1 } |
| 1101 | let k2 = kind(end, bigWord: bigWord) |
| 1102 | while end < lineE, kind(end, bigWord: bigWord) == k2 { end += 1 } |
| 1103 | } |
| 1104 | if k == 0 { |
| 1105 | let k2 = kind(end, bigWord: bigWord) |
| 1106 | while end < lineE, kind(end, bigWord: bigWord) == k2 { end += 1 } |
| 1107 | return start..<end |
| 1108 | } |
| 1109 | var trailing = end |
| 1110 | while trailing < lineE, let ch = char(trailing), Self.isBlank(ch) { trailing += 1 } |
| 1111 | if trailing > end { return start..<trailing } |
| 1112 | while start > lineS, let ch = char(start - 1), Self.isBlank(ch) { start -= 1 } |
| 1113 | return start..<end |
| 1114 | } |
| 1115 | |
| 1116 | func quoteObject(_ c: Int, quote: unichar, inner: Bool) -> Range<Int>? { |
| 1117 | let s = lineStart(c) |
| 1118 | let e = lineEnd(c) |
| 1119 | var positions: [Int] = [] |
| 1120 | var p = s |
| 1121 | while p < e { |
| 1122 | if char(p) == quote, p == s || char(p - 1) != 92 { positions.append(p) } |
| 1123 | p += 1 |
| 1124 | } |
| 1125 | var pair: (Int, Int)? |
| 1126 | var i = 0 |
| 1127 | while i + 1 < positions.count { |
| 1128 | if positions[i] <= c, c <= positions[i + 1] { pair = (positions[i], positions[i + 1]); break } |
| 1129 | i += 2 |
| 1130 | } |
| 1131 | guard let (open, close) = pair else { return nil } |
| 1132 | if inner { return (open + 1)..<close } |
| 1133 | var end = close + 1 |
| 1134 | while end < e, let ch = char(end), Self.isBlank(ch) { end += 1 } |
| 1135 | var start = open |
| 1136 | if end == close + 1 { while start > s, let ch = char(start - 1), Self.isBlank(ch) { start -= 1 } } |
| 1137 | return start..<end |
| 1138 | } |
| 1139 | |
| 1140 | func bracketObject(_ c: Int, open: unichar, close: unichar, inner: Bool) -> Range<Int>? { |
| 1141 | var depth = 0 |
| 1142 | var p = c |
| 1143 | var start: Int? |
| 1144 | if char(c) == open { |
| 1145 | start = c |
| 1146 | } else { |
| 1147 | if char(c) == close { p = c - 1 } |
| 1148 | while p >= 0 { |
| 1149 | if char(p) == close { depth += 1 } |
| 1150 | if char(p) == open { |
| 1151 | if depth == 0 { start = p; break } |
| 1152 | depth -= 1 |
| 1153 | } |
| 1154 | p -= 1 |
| 1155 | } |
| 1156 | } |
| 1157 | if start == nil { |
| 1158 | var f = c |
| 1159 | while f < lineEnd(c), char(f) != open { f += 1 } |
| 1160 | if f < lineEnd(c) { start = f } |
| 1161 | } |
| 1162 | guard let s = start else { return nil } |
| 1163 | depth = 0 |
| 1164 | var q = s |
| 1165 | var end: Int? |
| 1166 | while q < length { |
| 1167 | if char(q) == open { depth += 1 } |
| 1168 | if char(q) == close { |
| 1169 | depth -= 1 |
| 1170 | if depth == 0 { end = q; break } |
| 1171 | } |
| 1172 | q += 1 |
| 1173 | } |
| 1174 | guard let e = end else { return nil } |
| 1175 | if !inner { return s..<(e + 1) } |
| 1176 | var innerStart = s + 1 |
| 1177 | var innerEnd = e |
| 1178 | // A block that starts and ends on its own lines keeps them. |
| 1179 | if char(innerStart) == 10, lineStart(innerEnd) == innerEnd || substring(lineStart(innerEnd)..<innerEnd).allSatisfy({ $0 == " " || $0 == "\t" }) { |
| 1180 | innerStart += 1 |
| 1181 | innerEnd = lineStart(innerEnd) |
| 1182 | } |
| 1183 | return innerStart..<innerEnd |
| 1184 | } |
| 1185 | |
| 1186 | func paragraphObject(_ c: Int, inner: Bool) -> Range<Int>? { |
| 1187 | func blank(_ line: Int) -> Bool { substring(line..<lineEnd(line)).allSatisfy { $0 == " " || $0 == "\t" } } |
| 1188 | var start = lineStart(c) |
| 1189 | let isBlank = blank(start) |
| 1190 | while start > 0, blank(lineStart(start - 1)) == isBlank { start = lineStart(start - 1) } |
| 1191 | var end = lineEnd(c) |
| 1192 | while end < length, end + 1 <= length, end + 1 < length || !isBlank, blank(end + 1) == isBlank, end + 1 < length { |
| 1193 | end = lineEnd(end + 1) |
| 1194 | } |
| 1195 | var upper = min(length, end + 1) |
| 1196 | if !inner { |
| 1197 | var after = upper |
| 1198 | while after < length, blank(after) { |
| 1199 | let next = lineEnd(after) |
| 1200 | after = min(length, next + 1) |
| 1201 | if next >= length { break } |
| 1202 | } |
| 1203 | upper = after |
| 1204 | } |
| 1205 | return start..<upper |
| 1206 | } |
| 1207 | } |
| 1208 | } |