Parse string methods.

[appsup-dart]

Parse string methods.

[apgapg]

For using strings methods you need to override callexpression and provide the funciton manually. For example parseAsString(24)

[danielweil]

Yes, that I am aware. My problem is I want the parser to be able to handle string directly in the expression. I that possible?

Instead of image 1, do it as image 2.

[apgapg]

@danielweil '2'.days doesnt make any sense. See the expression parsing is failing at 24 char

[danielweil]

It is a method I created. If it was any other in dart language, is there any way that it would work?

For instance,

"2 ".trim()

What about the parseAsString(24) you told me above, can you be a bit more clear? Do I have to implement this in a custom class? Like "x.parseAsString(24)", {'x': CustomClass}?

[apgapg]

class ResponseEvaluator extends ExpressionEvaluator {
  const ResponseEvaluator();

  @override
  dynamic evalCallExpression(
    CallExpression expression,
    Map<String, dynamic> context,
  ) {
    if (expression.callee is Variable &&
        (expression.callee as Variable).identifier.name == "roundOff") {
      final arguments =
          expression.arguments.map((e) => eval(e, context)).toList();
      return Function.apply(roundOff, arguments);
    } else if (expression.callee is Variable &&
        (expression.callee as Variable).identifier.name == "subtractDates") {
      final arguments =
          expression.arguments.map((e) => eval(e, context)).toList();
      return Function.apply(subtractDates, arguments);
    } else if (expression.callee is Variable &&
        (expression.callee as Variable).identifier.name == "toString") {
      final arguments =
          expression.arguments.map((e) => eval(e, context)).toList();
      return Function.apply(convertToString, arguments);
    } else if (expression.callee is Variable &&
        (expression.callee as Variable).identifier.name == "toDouble") {
      final arguments =
          expression.arguments.map((e) => eval(e, context)).toList();
      return Function.apply(convertToDouble, arguments);
    }
    return super.evalCallExpression(expression, context);
  }
}

@danielweil See how i created custom methods for utilising string methods. Note you cant access string methods directly here because. expression wont evaluate.

to use above methods toString(23)

[danielweil]

Thanks! That cleared all my doubts!