Function parseSimpleCommand

source code/utils/bash/bashParser.ts:1143–1406

* Parse a simple command: [assignment]* word [arg|redirect]* * Returns variable_assignment if only one assignment and no command.

(P: ParseState)

 * Returns variable_assignment if only one assignment and no command.
 */
function parseSimpleCommand(P: ParseState): TsNode | null {
  const start = P.L.b
  const assignments: TsNode[] = []
  const preRedirects: TsNode[] = []

  while (true) {
    skipBlanks(P.L)
    const a = tryParseAssignment(P)
    if (a) {
      assignments.push(a)
      continue
    }
    const r = tryParseRedirect(P)
    if (r) {
      preRedirects.push(r)
      continue
    }
    break
  }

  skipBlanks(P.L)
  const save = saveLex(P.L)
  const nameTok = nextToken(P.L, 'cmd')
  if (
    nameTok.type === 'EOF' ||
    nameTok.type === 'NEWLINE' ||
    nameTok.type === 'COMMENT' ||
    (nameTok.type === 'OP' &&
      nameTok.value !== '{' &&
      nameTok.value !== '[' &&
      nameTok.value !== '[[') ||
    (nameTok.type === 'WORD' &&
      SHELL_KEYWORDS.has(nameTok.value) &&
      nameTok.value !== 'in')
  ) {
    restoreLex(P.L, save)
    // No command — standalone assignment(s) or redirect
    if (assignments.length === 1 && preRedirects.length === 0) {
      return assignments[0]!
    }
    if (preRedirects.length > 0 && assignments.length === 0) {
      // Bare redirect → redirected_statement with just file_redirect children
      const last = preRedirects[preRedirects.length - 1]!
      return mk(
        P,
        'redirected_statement',
        preRedirects[0]!.startIndex,
        last.endIndex,
        preRedirects,
      )
    }
    if (assignments.length > 1 && preRedirects.length === 0) {
      // `A=1 B=2` with no command → variable_assignments (plural)
      const last = assignments[assignments.length - 1]!
      return mk(
        P,
        'variable_assignments',
        assignments[0]!.startIndex,