Function parseExpression

packages/lang-core/src/parser/expressions.ts:24–331

(tokens: Token[])

 * precedence) parser.
 */
export function parseExpression(tokens: Token[]): ASTNode {
  let pos = 0;

  const cur = (): Token => tokens[pos] ?? { t: T.EOF };
  const adv = (): Token => {
    const tok = cur();
    pos++;
    return tok;
  };
  const eat = (kind: T): void => {
    if (cur().t === kind) pos++;
  };

  // ── Infix precedence lookup ─────────────────────────────────────────────
  function getInfixPrec(tok: Token): number {
    switch (tok.t) {
      case T.Question:
        return PREC_TERNARY;
      case T.Or:
        return PREC_OR;
      case T.And:
        return PREC_AND;
      case T.EqEq:
      case T.NotEq:
        return PREC_EQ;
      case T.Greater:
      case T.Less:
      case T.GreaterEq:
      case T.LessEq:
        return PREC_CMP;
      case T.Plus:
      case T.Minus:
        return PREC_ADD;
      case T.Star:
      case T.Slash:
      case T.Percent:
        return PREC_MUL;
      case T.Dot:
      case T.LBrack:
        return PREC_MEMBER;
      default:
        return 0;
    }
  }

  // ── Main Pratt loop ─────────────────────────────────────────────────────
  function parseExpr(minPrec: number = 0): ASTNode {
    let left = parsePrefix();
    while (getInfixPrec(cur()) > minPrec) {
      left = parseInfix(left);
    }
    return left;
  }

  // ── Prefix / atoms ─────────────────────────────────────────────────────
  function parsePrefix(): ASTNode {
    const tok = cur();