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| 1 | +import Foundation |
| 2 | + |
| 3 | +enum ExecInlineCommandParser { |
| 4 | + struct Match { |
| 5 | + let tokenIndex: Int |
| 6 | + let inlineCommand: String? |
| 7 | + let valueTokenOffset: Int |
| 8 | + |
| 9 | + init(tokenIndex: Int, inlineCommand: String?, valueTokenOffset: Int = 1) { |
| 10 | + self.tokenIndex = tokenIndex |
| 11 | + self.inlineCommand = inlineCommand |
| 12 | + self.valueTokenOffset = valueTokenOffset |
| 13 | + } |
| 14 | + } |
| 15 | + |
| 16 | + private struct CombinedCommandFlag { |
| 17 | + let attachedCommand: String? |
| 18 | + let separateValueCount: Int |
| 19 | + } |
| 20 | + |
| 21 | + private static let posixShellOptionsWithSeparateValues = Set([ |
| 22 | + "--init-file", |
| 23 | + "--rcfile", |
| 24 | + "-O", |
| 25 | + "-o", |
| 26 | + "+O", |
| 27 | + "+o", |
| 28 | + ]) |
| 29 | + |
| 30 | + static func hasPosixInteractiveStartupBeforeInlineCommand( |
| 31 | + _ argv: [String], |
| 32 | + flags: Set<String>) -> Bool |
| 33 | + { |
| 34 | + var idx = 1 |
| 35 | + var sawInteractiveMode = false |
| 36 | + while idx < argv.count { |
| 37 | + let token = argv[idx].trimmingCharacters(in: .whitespacesAndNewlines) |
| 38 | + if token.isEmpty { |
| 39 | + idx += 1 |
| 40 | + continue |
| 41 | + } |
| 42 | + if token == "--" { |
| 43 | + return false |
| 44 | + } |
| 45 | + if self.isPosixInteractiveModeOption(token) { |
| 46 | + sawInteractiveMode = true |
| 47 | + } |
| 48 | + if flags.contains(token) || self.isCombinedCommandFlag(token) { |
| 49 | + return sawInteractiveMode |
| 50 | + } |
| 51 | + if !token.hasPrefix("-"), !token.hasPrefix("+") { |
| 52 | + return false |
| 53 | + } |
| 54 | + let combinedValueCount = self.combinedSeparateValueOptionCount(token) |
| 55 | + if combinedValueCount > 0 { |
| 56 | + idx += 1 + combinedValueCount |
| 57 | + continue |
| 58 | + } |
| 59 | + if self.consumesSeparateValue(token) { |
| 60 | + idx += 2 |
| 61 | + continue |
| 62 | + } |
| 63 | + idx += 1 |
| 64 | + } |
| 65 | + return false |
| 66 | + } |
| 67 | + |
| 68 | + static func hasPosixLoginStartupBeforeInlineCommand( |
| 69 | + _ argv: [String], |
| 70 | + flags: Set<String>) -> Bool |
| 71 | + { |
| 72 | + var idx = 1 |
| 73 | + var sawLoginMode = false |
| 74 | + while idx < argv.count { |
| 75 | + let token = argv[idx].trimmingCharacters(in: .whitespacesAndNewlines) |
| 76 | + if token.isEmpty { |
| 77 | + idx += 1 |
| 78 | + continue |
| 79 | + } |
| 80 | + if token == "--" { |
| 81 | + return false |
| 82 | + } |
| 83 | + if token == "--login" || self.isPosixShortOption(token, containing: "l") { |
| 84 | + sawLoginMode = true |
| 85 | + } |
| 86 | + if flags.contains(token) || self.isCombinedCommandFlag(token) { |
| 87 | + return sawLoginMode |
| 88 | + } |
| 89 | + if !token.hasPrefix("-"), !token.hasPrefix("+") { |
| 90 | + return false |
| 91 | + } |
| 92 | + let combinedValueCount = self.combinedSeparateValueOptionCount(token) |
| 93 | + if combinedValueCount > 0 { |
| 94 | + idx += 1 + combinedValueCount |
| 95 | + continue |
| 96 | + } |
| 97 | + if self.consumesSeparateValue(token) { |
| 98 | + idx += 2 |
| 99 | + continue |
| 100 | + } |
| 101 | + idx += 1 |
| 102 | + } |
| 103 | + return false |
| 104 | + } |
| 105 | + |
| 106 | + static func hasFishInitCommandOption(_ argv: [String]) -> Bool { |
| 107 | + var idx = 1 |
| 108 | + while idx < argv.count { |
| 109 | + let token = argv[idx].trimmingCharacters(in: .whitespacesAndNewlines) |
| 110 | + if token.isEmpty { |
| 111 | + idx += 1 |
| 112 | + continue |
| 113 | + } |
| 114 | + if token == "--" { |
| 115 | + return false |
| 116 | + } |
| 117 | + if token == "-C" || token == "--init-command" { |
| 118 | + return true |
| 119 | + } |
| 120 | + if token.hasPrefix("-C"), token != "-C" { |
| 121 | + return true |
| 122 | + } |
| 123 | + if token.hasPrefix("--init-command=") { |
| 124 | + return true |
| 125 | + } |
| 126 | + if !token.hasPrefix("-"), !token.hasPrefix("+") { |
| 127 | + return false |
| 128 | + } |
| 129 | + idx += 1 |
| 130 | + } |
| 131 | + return false |
| 132 | + } |
| 133 | + |
| 134 | + static func hasFishAttachedCommandOption(_ argv: [String]) -> Bool { |
| 135 | + var idx = 1 |
| 136 | + while idx < argv.count { |
| 137 | + let token = argv[idx].trimmingCharacters(in: .whitespacesAndNewlines) |
| 138 | + if token.isEmpty { |
| 139 | + idx += 1 |
| 140 | + continue |
| 141 | + } |
| 142 | + if token == "--" { |
| 143 | + return false |
| 144 | + } |
| 145 | + if token.hasPrefix("-c"), token != "-c" { |
| 146 | + return true |
| 147 | + } |
| 148 | + if !token.hasPrefix("-"), !token.hasPrefix("+") { |
| 149 | + return false |
| 150 | + } |
| 151 | + idx += 1 |
| 152 | + } |
| 153 | + return false |
| 154 | + } |
| 155 | + |
| 156 | + static func findMatch( |
| 157 | + _ argv: [String], |
| 158 | + flags: Set<String>, |
| 159 | + allowCombinedC: Bool) -> Match? |
| 160 | + { |
| 161 | + var idx = 1 |
| 162 | + while idx < argv.count { |
| 163 | + let token = argv[idx].trimmingCharacters(in: .whitespacesAndNewlines) |
| 164 | + if token.isEmpty { |
| 165 | + idx += 1 |
| 166 | + continue |
| 167 | + } |
| 168 | + if token == "--" { |
| 169 | + break |
| 170 | + } |
| 171 | + let comparableToken = allowCombinedC ? token : token.lowercased() |
| 172 | + if flags.contains(comparableToken) { |
| 173 | + return Match(tokenIndex: idx, inlineCommand: nil) |
| 174 | + } |
| 175 | + if allowCombinedC, let combined = self.parseCombinedCommandFlag(token) { |
| 176 | + if let attachedCommand = combined.attachedCommand { |
| 177 | + return Match(tokenIndex: idx, inlineCommand: attachedCommand, valueTokenOffset: 0) |
| 178 | + } |
| 179 | + return Match( |
| 180 | + tokenIndex: idx, |
| 181 | + inlineCommand: nil, |
| 182 | + valueTokenOffset: 1 + combined.separateValueCount) |
| 183 | + } |
| 184 | + if allowCombinedC, !token.hasPrefix("-"), !token.hasPrefix("+") { |
| 185 | + break |
| 186 | + } |
| 187 | + let combinedValueCount = allowCombinedC ? self.combinedSeparateValueOptionCount(token) : 0 |
| 188 | + if combinedValueCount > 0 { |
| 189 | + idx += 1 + combinedValueCount |
| 190 | + continue |
| 191 | + } |
| 192 | + if allowCombinedC, self.consumesSeparateValue(token) { |
| 193 | + idx += 2 |
| 194 | + continue |
| 195 | + } |
| 196 | + idx += 1 |
| 197 | + } |
| 198 | + return nil |
| 199 | + } |
| 200 | + |
| 201 | + static func extractInlineCommand( |
| 202 | + _ argv: [String], |
| 203 | + flags: Set<String>, |
| 204 | + allowCombinedC: Bool) -> String? |
| 205 | + { |
| 206 | + guard let match = self.findMatch(argv, flags: flags, allowCombinedC: allowCombinedC) else { |
| 207 | + return nil |
| 208 | + } |
| 209 | + if let inlineCommand = match.inlineCommand { |
| 210 | + return inlineCommand |
| 211 | + } |
| 212 | + let nextIndex = match.tokenIndex + match.valueTokenOffset |
| 213 | + let payload = nextIndex < argv.count |
| 214 | + ? argv[nextIndex].trimmingCharacters(in: .whitespacesAndNewlines) |
| 215 | + : "" |
| 216 | + return payload.isEmpty ? nil : payload |
| 217 | + } |
| 218 | + |
| 219 | + private static func isCombinedCommandFlag(_ token: String) -> Bool { |
| 220 | + self.parseCombinedCommandFlag(token) != nil |
| 221 | + } |
| 222 | + |
| 223 | + private static func parseCombinedCommandFlag(_ token: String) -> CombinedCommandFlag? { |
| 224 | + let chars = Array(token) |
| 225 | + guard chars.count >= 2, chars[0] == "-", chars[1] != "-" else { |
| 226 | + return nil |
| 227 | + } |
| 228 | + let optionChars = Array(chars.dropFirst()) |
| 229 | + guard let commandFlagIndex = optionChars.firstIndex(of: "c") else { |
| 230 | + return nil |
| 231 | + } |
| 232 | + if optionChars.contains("-") { |
| 233 | + return nil |
| 234 | + } |
| 235 | + let suffix = String(optionChars.dropFirst(commandFlagIndex + 1)) |
| 236 | + if !suffix.isEmpty, |
| 237 | + suffix.range(of: #"[^A-Za-z]"#, options: .regularExpression) != nil |
| 238 | + { |
| 239 | + return CombinedCommandFlag(attachedCommand: suffix, separateValueCount: 0) |
| 240 | + } |
| 241 | + let separateValueCount = optionChars.reduce(0) { count, char in |
| 242 | + count + ((char == "o" || char == "O") ? 1 : 0) |
| 243 | + } |
| 244 | + return CombinedCommandFlag(attachedCommand: nil, separateValueCount: separateValueCount) |
| 245 | + } |
| 246 | + |
| 247 | + private static func combinedSeparateValueOptionCount(_ token: String) -> Int { |
| 248 | + let chars = Array(token) |
| 249 | + guard chars.count >= 2, chars[0] == "-" || chars[0] == "+", chars[1] != "-" else { |
| 250 | + return 0 |
| 251 | + } |
| 252 | + if chars.dropFirst().contains("-") { |
| 253 | + return 0 |
| 254 | + } |
| 255 | + return chars.dropFirst().reduce(0) { count, char in |
| 256 | + count + ((char == "o" || char == "O") ? 1 : 0) |
| 257 | + } |
| 258 | + } |
| 259 | + |
| 260 | + private static func consumesSeparateValue(_ token: String) -> Bool { |
| 261 | + self.posixShellOptionsWithSeparateValues.contains(token) |
| 262 | + } |
| 263 | + |
| 264 | + private static func isPosixInteractiveModeOption(_ token: String) -> Bool { |
| 265 | + token == "--interactive" || self.isPosixShortOption(token, containing: "i") |
| 266 | + } |
| 267 | + |
| 268 | + private static func isPosixShortOption(_ token: String, containing option: Character) -> Bool { |
| 269 | + let chars = Array(token) |
| 270 | + guard chars.count >= 2, chars[0] == "-", chars[1] != "-" else { |
| 271 | + return false |
| 272 | + } |
| 273 | + if chars.dropFirst().contains("-") { |
| 274 | + return false |
| 275 | + } |
| 276 | + return chars.dropFirst().contains(option) |
| 277 | + } |
| 278 | +} |
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