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1 | import Foundation |
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2 | |
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3 | /// Modal editing as Doom's evil gives it: normal, insert, visual and visual-line states; |
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4 | /// counts, registers, operators with motions and text objects, `.` repeat, evil-snipe's `s` |
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5 | /// and `S`, `Y` to the end of the line, and the unnamed register on the system clipboard. |
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6 | /// Keys go in; edits, moves and commands come out for the editor to apply. |
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7 | public struct Vim: Sendable { |
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8 | public enum Mode: String, Sendable { |
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9 | case normal, insert, visual |
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10 | case visualLine = "visual-line" |
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11 | |
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12 | /// The keymap mode name for bindings. |
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13 | public var keymapMode: String { |
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14 | switch self { |
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15 | case .normal: "normal" |
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16 | case .insert: "insert" |
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17 | case .visual, .visualLine: "visual" |
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18 | } |
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19 | } |
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20 | } |
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21 | |
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22 | public enum Action: Equatable, Sendable { |
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23 | /// Replace text and put the caret (and, in visual states, the selection) somewhere. |
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24 | case edit([TextEdit], caret: Int) |
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25 | case move(caret: Int) |
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26 | /// The selection to show in a visual state, `lowerBound..<upperBound`. |
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27 | case select(Range<Int>) |
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28 | case command(String) |
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29 | case undo(Int) |
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30 | case redo(Int) |
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31 | case setClipboard(String) |
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32 | /// Ask for a search pattern (`/`, `?`) or an ex command (`:`). |
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33 | case prompt(String) |
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34 | case message(String) |
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35 | } |
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36 | |
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37 | public struct Context: Sendable { |
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38 | public var text: String |
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39 | public var caret: Int |
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40 | public var clipboard: String? |
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41 | /// Lines in a half page, for C-d and C-u. |
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42 | public var halfPage: Int |
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43 | |
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44 | public init(text: String, caret: Int, clipboard: String? = nil, halfPage: Int = 15) { |
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45 | self.text = text |
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46 | self.caret = caret |
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47 | self.clipboard = clipboard |
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48 | self.halfPage = halfPage |
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49 | } |
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50 | } |
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51 | |
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52 | public private(set) var mode: Mode = .normal |
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53 | /// Keys of the command being typed. |
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54 | public private(set) var pending: [KeyChord] = [] |
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55 | var registers: [Character: (text: String, linewise: Bool)] = [:] |
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56 | /// What the clipboard held when this engine last wrote it, and whether that was whole lines. |
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57 | var clipboardRecord: (text: String, linewise: Bool)? |
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58 | var anchor = 0 |
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59 | var goalColumn: Int? |
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60 | var lastFind: (kind: Character, char: String)? |
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61 | var lastSnipe: (forward: Bool, chars: String)? |
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62 | var lastSearch: (pattern: String, forward: Bool)? |
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63 | /// The keys and inserted text of the last change, for `.`. |
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64 | var lastChange: (keys: [KeyChord], inserted: String?)? |
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65 | var changeKeys: [KeyChord]? |
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66 | var insertStart = 0 |
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67 | /// The caret when the command began, for commands that keep its column. |
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68 | var caretForApply = 0 |
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69 | /// Typed in insert state since it began, kept by `inserted(_:)`. |
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70 | var insertedText = "" |
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71 | |
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72 | public init() {} |
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73 | |
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74 | // MARK: - Feeding keys |
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75 | |
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76 | public mutating func feed(_ key: KeyChord, _ context: Context) -> [Action] { |
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77 | switch mode { |
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78 | case .insert: |
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79 | return insertKey(key, context) |
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80 | case .normal, .visual, .visualLine: |
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81 | pending.append(key) |
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82 | let keys = pending |
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83 | caretForApply = context.caret |
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84 | var buffer = Buffer(context) |
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85 | switch parse(keys, &buffer, context) { |
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86 | case .incomplete: |
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87 | return [] |
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88 | case .invalid: |
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89 | pending = [] |
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90 | return [] |
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91 | case .done(let actions): |
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92 | pending = [] |
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93 | return actions |
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94 | } |
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95 | } |
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96 | } |
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97 | |
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98 | /// Text typed in insert state, recorded for `.`. |
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99 | public mutating func inserted(_ text: String) { |
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100 | insertedText += text |
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101 | } |
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102 | |
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103 | public mutating func deletedBackward() { |
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104 | if !insertedText.isEmpty { insertedText.removeLast() } |
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105 | } |
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106 | |
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107 | private mutating func insertKey(_ key: KeyChord, _ context: Context) -> [Action] { |
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108 | let buffer = Buffer(context) |
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109 | if key == KeyChord("ESC") || key == KeyChord("[", .control) || key == KeyChord("g", .control) { |
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110 | mode = .normal |
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111 | if var keys = changeKeys { |
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112 | keys.append(KeyChord("ESC")) |
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113 | lastChange = (keys, insertedText) |
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114 | changeKeys = nil |
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115 | } |
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116 | let caret = context.caret |
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117 | let lineStart = buffer.lineStart(caret) |
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118 | return [.move(caret: caret > lineStart ? caret - 1 : caret)] |
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119 | } |
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120 | if key == KeyChord("w", .control) { |
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121 | let start = buffer.wordBackward(context.caret, bigWord: false, stopAtLine: true) |
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122 | guard start < context.caret else { return [] } |
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123 | return [.edit([TextEdit(range: start..<context.caret, replacement: "")], caret: start)] |
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124 | } |
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125 | if key == KeyChord("u", .control) { |
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126 | let start = buffer.firstNonBlank(buffer.lineStart(context.caret)) |
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127 | let from = context.caret > start ? start : buffer.lineStart(context.caret) |
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128 | guard from < context.caret else { return [] } |
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129 | return [.edit([TextEdit(range: from..<context.caret, replacement: "")], caret: from)] |
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130 | } |
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131 | return [] |
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132 | } |
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133 | |
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134 | /// Whether a key in insert state belongs to the text system. |
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135 | public func passesThrough(_ key: KeyChord) -> Bool { |
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136 | guard mode == .insert else { return false } |
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137 | return !(key == KeyChord("ESC") || key == KeyChord("[", .control) || key == KeyChord("g", .control) |
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138 | || key == KeyChord("w", .control) || key == KeyChord("u", .control)) |
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139 | } |
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140 | |
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141 | public mutating func enterInsert(at caret: Int, keys: [KeyChord]) { |
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142 | mode = .insert |
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143 | insertStart = caret |
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144 | insertedText = "" |
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145 | changeKeys = keys |
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146 | } |
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147 | |
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148 | // MARK: - Parsing |
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149 | |
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150 | enum Parse { |
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151 | case incomplete |
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152 | case invalid |
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153 | case done([Action]) |
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154 | } |
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155 | |
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156 | struct Command { |
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157 | var register: Character? |
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158 | var count: Int? |
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159 | var keys: ArraySlice<KeyChord> |
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160 | } |
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161 | |
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162 | /// `evil-shift-width`, which Doom keeps equal to `tab-width`: 8 in Org. |
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163 | static let shiftWidth = 8 |
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164 | |
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165 | /// What `indent-according-to-mode` gives a line after `line` in Org: under a list item, |
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166 | /// its text's column; under a heading, none; otherwise `line`'s own indentation. |
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167 | static func indentation(for buffer: Buffer, line: Int) -> String { |
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168 | let text = buffer.substring(buffer.lineStart(line)..<buffer.lineEnd(line)) |
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169 | let item = try! NSRegularExpression(pattern: "^[ \\t]*([-+*]|[0-9]+[.)])[ \\t]+") |
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170 | let ns = text as NSString |
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171 | if text.hasPrefix("*") { return "" } |
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172 | if let m = item.firstMatch(in: text, range: NSRange(location: 0, length: ns.length)) { |
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173 | return String(repeating: " ", count: m.range.length) |
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174 | } |
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175 | return String(text.prefix { $0 == " " || $0 == "\t" }) |
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176 | } |
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177 | |
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178 | static func digit(_ key: KeyChord) -> Int? { |
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179 | guard key.modifiers.isEmpty, key.key.count == 1, let d = Int(key.key) else { return nil } |
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180 | return d |
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181 | } |
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182 | |
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183 | /// Reads `"r` and a count off the front of `keys`. |
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184 | static func prefix(_ keys: [KeyChord]) -> (register: Character?, count: Int?, rest: ArraySlice<KeyChord>)? { |
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185 | var rest = keys[...] |
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186 | var register: Character? |
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187 | if rest.first?.key == "\"", rest.first?.modifiers.isEmpty == true { |
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188 | guard rest.count >= 2 else { return nil } |
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189 | register = rest[rest.startIndex + 1].key == "SPC" ? " " : rest[rest.startIndex + 1].key.first |
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190 | rest = rest.dropFirst(2) |
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191 | } |
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192 | var count: Int? |
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193 | while let key = rest.first, let d = digit(key), !(d == 0 && count == nil) { |
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194 | count = (count ?? 0) * 10 + d |
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195 | rest = rest.dropFirst() |
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196 | } |
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197 | return (register, count, rest) |
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198 | } |
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199 | |
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200 | mutating func parse(_ keys: [KeyChord], _ buffer: inout Buffer, _ context: Context) -> Parse { |
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201 | guard let (register, count, rest) = Self.prefix(keys) else { return .incomplete } |
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202 | guard let first = rest.first else { return .incomplete } |
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203 | let visual = mode == .visual || mode == .visualLine |
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204 | let n = count ?? 1 |
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205 | let caret = context.caret |
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206 | |
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207 | // Operators. |
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208 | let operatorKeys: [String: String] = ["d": "d", "c": "c", "y": "y", ">": ">", "<": "<"] |
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209 | var op: String? |
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210 | var afterOp = rest.dropFirst() |
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211 | if first.modifiers.isEmpty, let o = operatorKeys[first.key] { |
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212 | op = o |
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213 | } else if first.key == "g", first.modifiers.isEmpty { |
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214 | guard let second = rest.dropFirst().first else { return .incomplete } |
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215 | if ["~", "u", "U"].contains(second.key), second.modifiers.isEmpty { |
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216 | op = "g" + second.key |
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217 | afterOp = rest.dropFirst(2) |
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218 | } |
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219 | } |
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220 | if let op { |
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221 | if visual { |
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222 | let range = visualRange(buffer, caret) |
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223 | return .done(apply(op, range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
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224 | } |
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225 | // A second count and the motion. |
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226 | guard let (_, count2, motionKeys) = Self.prefix(Array(afterOp)), let motionFirst = motionKeys.first else { return .incomplete } |
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227 | let total = n * (count2 ?? 1) |
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228 | let doubled = op.count == 1 ? op : String(op.last!) |
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229 | if motionFirst.key == doubled, motionFirst.modifiers.isEmpty, motionKeys.count == 1 || (op.count == 2 && motionFirst.key == String(op.last!)) { |
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230 | // dd, cc, yy, >>, <<, g~~, guu, gUU: whole lines. |
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231 | let startLine = buffer.lineStart(caret) |
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232 | var end = startLine |
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233 | for _ in 0..<total { |
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234 | let next = buffer.lineEnd(end) |
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235 | end = next < buffer.length ? next + 1 : next |
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236 | if end >= buffer.length { break } |
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237 | } |
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238 | return .done(apply(op, range: startLine..<max(end, buffer.lineEnd(startLine)), linewise: true, buffer, register: register, keys: keys, count: total)) |
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239 | } |
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240 | if motionFirst.key == "i" || motionFirst.key == "a", motionFirst.modifiers.isEmpty { |
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241 | guard motionKeys.count >= 2 else { return .incomplete } |
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242 | guard let object = textObject(motionFirst.key == "i", motionKeys[motionKeys.startIndex + 1], buffer, caret, count: total) else { return .invalid } |
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243 | return .done(apply(op, range: object.range, linewise: object.linewise, buffer, register: register, keys: keys, count: total)) |
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244 | } |
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245 | var motionCaret = caret |
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246 | if op == "c", motionFirst.key == "w" || motionFirst.key == "W", motionFirst.modifiers.isEmpty, |
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247 | let c = buffer.char(caret), !Buffer.isBlank(c) { |
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248 | // cw acts as ce on a word. |
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249 | var end = caret |
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250 | for _ in 0..<total { end = buffer.wordEnd(end, bigWord: motionFirst.key == "W", fromInside: true) } |
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251 | return .done(apply(op, range: caret..<min(buffer.length, end + 1), linewise: false, buffer, register: register, keys: keys, count: total)) |
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252 | } |
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253 | switch motion(Array(motionKeys), &buffer, &motionCaret, count: total, operatorPending: true) { |
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254 | case .incomplete: return .incomplete |
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255 | case .invalid: return .invalid |
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256 | case .moved(let target, let kind): |
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257 | var range: Range<Int> |
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258 | var linewise = false |
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259 | switch kind { |
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260 | case .linewise: |
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261 | let a = buffer.lineStart(min(caret, target)) |
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262 | let b = buffer.lineEnd(max(caret, target)) |
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263 | range = a..<min(buffer.length, b + 1) |
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264 | linewise = true |
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265 | case .inclusive: |
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266 | range = min(caret, target)..<min(buffer.length, max(caret, target) + 1) |
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267 | case .exclusive: |
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268 | range = min(caret, target)..<max(caret, target) |
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269 | // dw at the end of a line stops at the line's end. |
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270 | if motionFirst.key == "w" || motionFirst.key == "W", buffer.lineStart(range.upperBound) != buffer.lineStart(range.lowerBound), range.upperBound > range.lowerBound { |
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271 | var end = buffer.lineEnd(range.lowerBound) |
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272 | if end == range.lowerBound, total == 1 { end = min(buffer.length, end + 1) } |
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273 | let upper = buffer.firstNonBlankOrEnd(buffer.lineStart(range.upperBound)) == range.upperBound |
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274 | ? max(range.lowerBound, min(end, range.upperBound)) : range.upperBound |
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275 | range = range.lowerBound..<(upper == range.lowerBound ? end : upper) |
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276 | if buffer.lineStart(range.upperBound) != buffer.lineStart(range.lowerBound) { |
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277 | range = range.lowerBound..<buffer.lineEnd(range.lowerBound) |
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278 | } |
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279 | } |
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280 | } |
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281 | return .done(apply(op, range: range, linewise: linewise, buffer, register: register, keys: keys, count: total)) |
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282 | } |
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283 | } |
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284 | |
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285 | if visual, first.modifiers.isEmpty { |
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286 | switch first.key { |
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287 | case "ESC": |
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288 | mode = .normal |
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289 | return .done([.move(caret: buffer.clampNormal(caret))]) |
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290 | case "o": |
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291 | let old = anchor |
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292 | anchor = caret |
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293 | return .done(visualActions(buffer, old)) |
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294 | case "x": |
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295 | let range = visualRange(buffer, caret) |
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296 | return .done(apply("d", range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
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297 | case "~", "u", "U": |
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298 | let range = visualRange(buffer, caret) |
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299 | return .done(apply(first.key == "~" ? "g~" : "g" + first.key, range: range.range, linewise: range.linewise, buffer, register: register, keys: keys, count: n)) |
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300 | case "J": |
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301 | let range = visualRange(buffer, caret) |
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302 | let lines = max(2, buffer.lineCount(range.range)) |
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303 | mode = .normal |
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304 | return .done(join(buffer, at: range.range.lowerBound, lines: lines, keys: keys)) |
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305 | case "p", "P": |
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306 | let range = visualRange(buffer, caret) |
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307 | guard let (text, linewise) = paste(register, context) else { return .done([]) } |
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308 | mode = .normal |
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309 | var replacement = text |
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310 | if linewise, !range.linewise { replacement = "\n" + text } |
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311 | if !linewise, range.linewise { replacement += "\n" } |
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312 | let removed = buffer.substring(range.range) |
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313 | var actions: [Action] = [.edit([TextEdit(range: range.range, replacement: replacement)], caret: range.range.lowerBound + (linewise ? 0 : max(0, replacement.utf16.count - 1)))] |
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314 | actions += store(removed, linewise: range.linewise, register: nil, yank: false) |
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315 | return .done(actions) |
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316 | case "v": |
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317 | if mode == .visual { |
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318 | mode = .normal |
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319 | return .done([.move(caret: buffer.clampNormal(caret))]) |
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320 | } |
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321 | mode = .visual |
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322 | return .done(visualActions(buffer, caret)) |
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323 | case "V": |
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324 | if mode == .visualLine { |
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325 | mode = .normal |
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326 | return .done([.move(caret: buffer.clampNormal(caret))]) |
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327 | } |
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328 | mode = .visualLine |
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329 | return .done(visualActions(buffer, caret)) |
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330 | case "i", "a": |
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331 | guard rest.count >= 2 else { return .incomplete } |
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332 | guard let object = textObject(first.key == "i", rest[rest.startIndex + 1], buffer, caret, count: n) else { return .invalid } |
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333 | if object.linewise { mode = .visualLine } |
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334 | anchor = object.range.lowerBound |
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335 | let end = max(object.range.lowerBound, object.range.upperBound - 1) |
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336 | return .done(visualActions(buffer, end)) |
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337 | default: |
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338 | break |
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339 | } |
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340 | } |
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341 | |
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342 | if !visual { |
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343 | switch (first.key, first.modifiers) { |
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344 | case ("i", []), ("a", []), ("I", []), ("A", []), ("o", []), ("O", []): |
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345 | return .done(enterInsert(first.key, buffer, caret, keys: keys)) |
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346 | case ("v", []): |
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347 | mode = .visual |
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348 | anchor = caret |
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349 | return .done(visualActions(buffer, caret)) |
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350 | case ("V", []): |
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351 | mode = .visualLine |
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352 | anchor = caret |
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353 | return .done(visualActions(buffer, caret)) |
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354 | case ("x", []), ("<delete>", []): |
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355 | guard let c = buffer.char(caret), c != 10 else { return .done([]) } |
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356 | let end = min(buffer.lineEnd(caret), caret + n) |
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357 | return .done(apply("d", range: caret..<end, linewise: false, buffer, register: register, keys: keys, count: n)) |
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358 | case ("X", []): |
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359 | let start = max(buffer.lineStart(caret), caret - n) |
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360 | guard start < caret else { return .done([]) } |
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361 | return .done(apply("d", range: start..<caret, linewise: false, buffer, register: register, keys: keys, count: n)) |
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362 | case ("D", []), ("C", []): |
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363 | var end = buffer.lineEnd(caret) |
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364 | for _ in 1..<max(1, n) where end < buffer.length { end = buffer.lineEnd(end + 1) } |
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365 | return .done(apply(first.key == "D" ? "d" : "c", range: caret..<end, linewise: false, buffer, register: register, keys: keys, count: n)) |
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366 | case ("Y", []): |
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367 | // `evil-want-Y-yank-to-eol`. |
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368 | return .done(apply("y", range: caret..<buffer.lineEnd(caret), linewise: false, buffer, register: register, keys: keys, count: n)) |
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369 | case ("p", []), ("P", []): |
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370 | guard let (text, linewise) = paste(register, context) else { return .done([]) } |
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371 | let repeated = String(repeating: text, count: n) |
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372 | if linewise { |
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373 | let body = repeated.hasSuffix("\n") ? repeated : repeated + "\n" |
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374 | if first.key == "p" { |
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375 | let end = buffer.lineEnd(caret) |
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376 | if end >= buffer.length { |
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377 | let insertion = "\n" + String(body.dropLast()) |
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378 | return .done(change([TextEdit(range: end..<end, replacement: insertion)], caret: buffer.firstNonBlankIn(insertion, at: end + 1), keys: keys)) |
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379 | } |
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380 | return .done(change([TextEdit(range: (end + 1)..<(end + 1), replacement: body)], caret: buffer.firstNonBlankIn(body, at: end + 1), keys: keys)) |
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381 | } |
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382 | let start = buffer.lineStart(caret) |
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383 | return .done(change([TextEdit(range: start..<start, replacement: body)], caret: buffer.firstNonBlankIn(body, at: start), keys: keys)) |
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384 | } |
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385 | let at = first.key == "p" && buffer.char(caret).map({ $0 != 10 }) == true ? caret + 1 : caret |
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386 | return .done(change([TextEdit(range: at..<at, replacement: repeated)], caret: at + max(0, repeated.utf16.count - 1), keys: keys)) |
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387 | case ("J", []): |
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388 | return .done(join(buffer, at: caret, lines: max(2, n), keys: keys)) |
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389 | case ("~", []): |
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390 | let end = min(buffer.lineEnd(caret), caret + n) |
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391 | guard end > caret else { return .done([]) } |
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392 | let flipped = String(buffer.substring(caret..<end).map { $0.isUppercase ? Character($0.lowercased()) : Character($0.uppercased()) }) |
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393 | return .done(change([TextEdit(range: caret..<end, replacement: flipped)], caret: buffer.clampNormal(end, in: buffer.lineStart(caret)), keys: keys)) |
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394 | case ("r", []): |
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395 | guard rest.count >= 2 else { return .incomplete } |
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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 | } |