Function parseCommand

source code/utils/bash/bashParser.ts:997–1137

Parse a single command: simple, compound, or control structure.

(P: ParseState)

/** Parse a single command: simple, compound, or control structure. */
function parseCommand(P: ParseState): TsNode | null {
  skipBlanks(P.L)
  const save = saveLex(P.L)
  const t = nextToken(P.L, 'cmd')

  if (t.type === 'EOF') {
    restoreLex(P.L, save)
    return null
  }

  // Negation — tree-sitter wraps just the command, redirects go outside.
  // `! cmd > out` → redirected_statement(negated_command(!, cmd), >out)
  if (t.type === 'OP' && t.value === '!') {
    const bang = leaf(P, '!', t)
    const inner = parseCommand(P)
    if (!inner) {
      restoreLex(P.L, save)
      return null
    }
    // If inner is a redirected_statement, hoist redirects outside negation
    if (inner.type === 'redirected_statement' && inner.children.length >= 2) {
      const cmd = inner.children[0]!
      const redirs = inner.children.slice(1)
      const neg = mk(P, 'negated_command', bang.startIndex, cmd.endIndex, [
        bang,
        cmd,
      ])
      const lastR = redirs[redirs.length - 1]!
      return mk(P, 'redirected_statement', neg.startIndex, lastR.endIndex, [
        neg,
        ...redirs,
      ])
    }
    return mk(P, 'negated_command', bang.startIndex, inner.endIndex, [
      bang,
      inner,
    ])
  }

  if (t.type === 'OP' && t.value === '(') {
    const open = leaf(P, '(', t)
    const body = parseStatements(P, ')')
    const closeTok = nextToken(P.L, 'cmd')
    const close =
      closeTok.type === 'OP' && closeTok.value === ')'
        ? leaf(P, ')', closeTok)
        : mk(P, ')', open.endIndex, open.endIndex, [])
    const node = mk(P, 'subshell', open.startIndex, close.endIndex, [
      open,
      ...body,
      close,
    ])
    return maybeRedirect(P, node)
  }

  if (t.type === 'OP' && t.value === '((') {
    const open = leaf(P, '((', t)
    const exprs = parseArithCommaList(P, '))', 'var')