visitVarDecl method

@override Uint8List visitVarDecl(VarDecl stmt)

Implementation

@override
Uint8List visitVarDecl(VarDecl stmt) {
  final bytesBuilder = BytesBuilder();
  // Only const declaration with a const expression as initializer
  // can be compiled into a const declaration,
  // otherwise will be compiled as a normal variable declaration,
  // with a static warning output.
  if (stmt.isConstValue) {
    bytesBuilder.addByte(HTOpCode.constDecl);
    bytesBuilder.add(_parseIdentifier(stmt.id.id));
    if (stmt.classId != null) {
      bytesBuilder.addByte(1); // bool: has class id
      bytesBuilder.add(_parseIdentifier(stmt.classId!));
    } else {
      bytesBuilder.addByte(0); // bool: has class id
    }
    bytesBuilder.addByte(stmt.isTopLevel ? 1 : 0);
    late int type, index;
    if (stmt.value is bool) {
      type = HTConstantType.boolean.index;
      index = _currentConstantTable.addGlobalConstant<bool>(stmt.value);
    } else if (stmt.value is int) {
      type = HTConstantType.integer.index;
      index = _currentConstantTable.addGlobalConstant<int>(stmt.value);
    } else if (stmt.value is double) {
      type = HTConstantType.float.index;
      index = _currentConstantTable.addGlobalConstant<double>(stmt.value);
    } else if (stmt.value is String) {
      type = HTConstantType.string.index;
      index = _currentConstantTable.addGlobalConstant<String>(stmt.value);
    }
    bytesBuilder.addByte(type);
    bytesBuilder.add(_uint16(index));
  } else {
    bytesBuilder.addByte(HTOpCode.varDecl);
    bytesBuilder.add(_parseIdentifier(stmt.id.id));
    if (stmt.classId != null) {
      bytesBuilder.addByte(1); // bool: has class id
      bytesBuilder.add(_parseIdentifier(stmt.classId!));
    } else {
      bytesBuilder.addByte(0); // bool: has class id
    }
    bytesBuilder.addByte(stmt.isField ? 1 : 0);
    bytesBuilder.addByte(stmt.isExternal ? 1 : 0);
    bytesBuilder.addByte(stmt.isStatic ? 1 : 0);
    bytesBuilder.addByte(stmt.isMutable ? 1 : 0);
    bytesBuilder.addByte(stmt.isTopLevel ? 1 : 0);
    bytesBuilder.addByte(stmt.lateFinalize ? 1 : 0);
    bytesBuilder.addByte(stmt.lateInitialize ? 1 : 0);
    if (stmt.declType != null) {
      bytesBuilder.addByte(1); // bool: has type decl
      final typeDecl = compileAST(stmt.declType!);
      bytesBuilder.add(typeDecl);
    } else {
      bytesBuilder.addByte(0); // bool: has type decl
    }
    if (stmt.initializer != null) {
      bytesBuilder.addByte(1); // bool: has initializer
      final initializer = compileAST(stmt.initializer!, endOfExec: true);
      if (stmt.lateInitialize) {
        bytesBuilder.add(_uint16(stmt.initializer!.line));
        bytesBuilder.add(_uint16(stmt.initializer!.column));
        bytesBuilder.add(_uint16(initializer.length));
      }
      bytesBuilder.add(initializer);
    } else {
      bytesBuilder.addByte(0); // bool: has initializer
    }
  }
  if (stmt.hasEndOfStmtMark) {
    bytesBuilder.addByte(HTOpCode.endOfStmt);
  }
  return bytesBuilder.toBytes();
}