visitUnaryPrefixExpr method

@override Uint8List visitUnaryPrefixExpr(UnaryPrefixExpr expr)

-e, !e，++e, --e

Implementation

@override
Uint8List visitUnaryPrefixExpr(UnaryPrefixExpr expr) {
  final bytesBuilder = BytesBuilder();
  final value = compileAST(expr.object);
  if (expr.op == _lexicon.negative) {
    bytesBuilder.add(value);
    bytesBuilder.addByte(HTOpCode.negative);
  } else if (expr.op == _lexicon.logicalNot) {
    bytesBuilder.add(value);
    bytesBuilder.addByte(HTOpCode.logicalNot);
  } else if (expr.op == _lexicon.preIncrement) {
    final constOne = ASTLiteralInteger(1);
    late final ASTNode value;
    final add = BinaryExpr(expr.object, _lexicon.add, constOne);
    value = AssignExpr(expr.object, _lexicon.assign, add);
    final group = GroupExpr(value);
    final bytes = compileAST(group);
    bytesBuilder.add(bytes);
  } else if (expr.op == _lexicon.preDecrement) {
    final constOne = ASTLiteralInteger(1);
    late final ASTNode value;
    final subtract = BinaryExpr(expr.object, _lexicon.subtract, constOne);
    value = AssignExpr(expr.object, _lexicon.assign, subtract);
    final group = GroupExpr(value);
    final bytes = compileAST(group);
    bytesBuilder.add(bytes);
  } else if (expr.op == _lexicon.kTypeof) {
    bytesBuilder.add(value);
    bytesBuilder.addByte(HTOpCode.typeOf);
  } else if (expr.op == _lexicon.kAwait) {
    bytesBuilder.add(value);
    bytesBuilder.addByte(HTOpCode.awaitedValue);
  }
  return bytesBuilder.toBytes();
}