Function parseArithPrimary

src/utils/bash/bashParser.ts:4321–4424

(
  P: ParseState,
  stop: string,
  mode: ArithMode,
)

}

function parseArithPrimary(
  P: ParseState,
  stop: string,
  mode: ArithMode,
): TsNode | null {
  skipBlanks(P.L)
  if (isArithStop(P, stop)) return null
  const c = peek(P.L)
  if (c === '(') {
    const s = P.L.b
    advance(P.L)
    const open = mk(P, '(', s, P.L.b, [])
    // Parenthesized expression may contain comma-separated exprs
    const inners = parseArithCommaList(P, ')', mode)
    skipBlanks(P.L)
    let close: TsNode
    if (peek(P.L) === ')') {
      const cs = P.L.b
      advance(P.L)
      close = mk(P, ')', cs, P.L.b, [])
    } else {
      close = mk(P, ')', P.L.b, P.L.b, [])
    }
    return mk(P, 'parenthesized_expression', open.startIndex, close.endIndex, [
      open,
      ...inners,
      close,
    ])
  }
  if (c === '"') {
    return parseDoubleQuoted(P)
  }
  if (c === '$') {
    return parseDollarLike(P)
  }
  if (isDigit(c)) {
    const s = P.L.b
    while (isDigit(peek(P.L))) advance(P.L)
    // Hex: 0x1f
    if (
      P.L.b - s === 1 &&
      c === '0' &&
      (peek(P.L) === 'x' || peek(P.L) === 'X')
    ) {
      advance(P.L)
      while (isHexDigit(peek(P.L))) advance(P.L)
    }
    // Base notation: BASE#DIGITS e.g. 2#1010, 16#ff
    else if (peek(P.L) === '#') {
      advance(P.L)
      while (isBaseDigit(peek(P.L))) advance(P.L)
    }
    return mk(P, 'number', s, P.L.b, [])
  }
  if (isIdentStart(c)) {
    const s = P.L.b
    while (isIdentChar(peek(P.L))) advance(P.L)
    const nc = peek(P.L)