Function parsePipeline

source code/utils/bash/bashParser.ts:940–994

* Parse commands joined by | or |&. Flat children with operator leaves. * tree-sitter quirk: `a | b 2>nul | c` hoists the redirect on `b` to wrap * the preceding pipeline fragment — pipeline(redirected_statement( * pipeline(a,|,b), 2>nul), |, c).

(P: ParseState)

 * pipeline(a,|,b), 2>nul), |, c).
 */
function parsePipeline(P: ParseState): TsNode | null {
  let first = parseCommand(P)
  if (!first) return null
  const parts: TsNode[] = [first]
  while (true) {
    const save = saveLex(P.L)
    const t = nextToken(P.L, 'cmd')
    if (t.type === 'OP' && (t.value === '|' || t.value === '|&')) {
      const op = leaf(P, t.value, t)
      skipNewlines(P)
      const next = parseCommand(P)
      if (!next) {
        parts.push(op)
        break
      }
      // Hoist trailing redirect on `next` to wrap current pipeline fragment
      if (
        next.type === 'redirected_statement' &&
        next.children.length >= 2 &&
        parts.length >= 1
      ) {
        const inner = next.children[0]!
        const redirs = next.children.slice(1)
        // Wrap existing parts + op + inner as a pipeline
        const pipeKids = [...parts, op, inner]
        const pipeNode = mk(
          P,
          'pipeline',
          pipeKids[0]!.startIndex,
          inner.endIndex,
          pipeKids,
        )
        const lastR = redirs[redirs.length - 1]!
        const wrapped = mk(
          P,
          'redirected_statement',
          pipeNode.startIndex,
          lastR.endIndex,
          [pipeNode, ...redirs],
        )
        parts.length = 0
        parts.push(wrapped)
        first = wrapped
        continue
      }
      parts.push(op, next)
    } else {
      restoreLex(P.L, save)
      break
    }
  }
  if (parts.length === 1) return parts[0]!
  const last = parts[parts.length - 1]!
  return mk(P, 'pipeline', parts[0]!.startIndex, last.endIndex, parts)
}

/** Parse a single command: simple, compound, or control structure. */
function parseCommand(P: ParseState): TsNode | null {