Function maskBracesInQuotedContexts

src/utils/bash/ast.ts:332–372

* Mask `{` characters that appear inside single- or double-quoted contexts. * Uses a single-pass bash-aware quote-state scanner instead of a regex. * * A naive regex (`/'[^']*'/g`) mis-detects spans when a `'` appears inside * a double-quoted string: for `echo "it's" {a'}',b}`, it matches from t

(cmd: string)

 * either is safe. Secondary defense: BRACE_EXPANSION_RE in walkArgument.
 */
function maskBracesInQuotedContexts(cmd: string): string {
  // Fast path: no `{` → nothing to mask. Skips the char-by-char scan for
  // the >90% of commands with no braces (`ls -la`, `git status`, etc).
  if (!cmd.includes('{')) return cmd
  const out: string[] = []
  let inSingle = false
  let inDouble = false
  let i = 0
  while (i < cmd.length) {
    const c = cmd[i]!
    if (inSingle) {
      // Bash single quotes: no escapes, `'` always terminates.
      if (c === "'") inSingle = false
      out.push(c === '{' ? ' ' : c)
      i++
    } else if (inDouble) {
      // Bash double quotes: `\` escapes `"` and `\` (also `$`, backtick,
      // newline — but those don't affect quote state so we let them pass).
      if (c === '\\' && (cmd[i + 1] === '"' || cmd[i + 1] === '\\')) {
        out.push(c, cmd[i + 1]!)
        i += 2
      } else {
        if (c === '"') inDouble = false
        out.push(c === '{' ? ' ' : c)
        i++
      }
    } else {
      // Unquoted: `\` escapes any next char.
      if (c === '\\' && i + 1 < cmd.length) {
        out.push(c, cmd[i + 1]!)
        i += 2
      } else {
        if (c === "'") inSingle = true
        else if (c === '"') inDouble = true
        out.push(c)
        i++
      }
    }
  }
  return out.join('')
}

const DOLLAR = String.fromCharCode(0x24)