create an abap report that gets a table of strings that represent the source code of a class. Convert it into an xml file. Take care it will have all the details so the class can be recreated by seeing the xml text
Take care to not violate abap compiler rules. It should also work for things that arent in the example!
Solve it by using an object oriented style! I would recommend to tokenize the code first

Example Output:

<class>
 <name>ZCA_CLASS</name>
 <attribute>
  <name>gv_attr</name>
  <type>string</type>
  <comment>Attribut, genutzt für etwas</comment>
 </attribute>
 <method>
  <name>constructor</name>
  <parameter>
   <name>iv_string</name>
   <type>string</type>
   <kind>importing</type>
   <comment>Zu importierender String</comment>
  <parameter>
  <comment>Constructor der Klasse</comment>
  <code>
   <line>"First line"</line>
   <type>Comment</line>
  </code>
  <code>
   <line>Write: 'Hello'.</line>
   <type>Code</line> 
  </code>
 </method>
</class>

Example-Input:
CLASS zca_nn_neuron DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC.

  PUBLIC SECTION.

    TYPES:
      BEGIN OF ts_weight,
        value        TYPE float,
        gradient     TYPE float,
        target       TYPE zca_nn_neuid,
        mutationrate TYPE float,
      END OF ts_weight.

    "! Weights of this neuron
    TYPES tt_weights TYPE STANDARD TABLE OF ts_weight WITH DEFAULT KEY.

    DATA layer_number TYPE i.
    DATA neuron_index TYPE zca_nn_neuid.
    DATA neuron_value TYPE float.
    DATA neuron_gradient TYPE float.

    "! Weights of this neuron
    DATA gt_weights TYPE tt_weights.

    "! Constructor
    "! @parameter iv_layernumber | ID of the layer this neuron belongs to
    "! @parameter iv_neuronindex | ID of this neuron
    "! @parameter iv_neuronvalue | Value of this neuron
    "! @parameter it_weights | Weights of this neuron
    METHODS constructor
      IMPORTING
        !iv_layernumber TYPE i
        !iv_neuronindex TYPE i
        !iv_neuronvalue TYPE float
        !it_weights     TYPE tt_weights.

    "! Activates the neuron
    "! @parameter iv_function | Determines the activation function
    METHODS activateneuron
      IMPORTING
        !iv_function TYPE zca_nn_math=>tv_activation_function.

    "! Sets the desired value of the neuron
    "! @parameter iv_function | Activation function
    "! @parameter iv_value | Desired value
    METHODS set_desired
      IMPORTING
        !iv_function TYPE zca_nn_math=>tv_activation_function
        !iv_value    TYPE float.

    "! Computes the gradient of the neuron
    "! @parameter iv_function | Activation function
    "! @parameter iv_value | Desired value
    METHODS computegradient
      IMPORTING
        !iv_function TYPE zca_nn_math=>tv_activation_function
        !iv_value    TYPE float.

    "! Computes the gradient of the hidden layer
    "! @parameter iv_function | Activation function
    "! @parameter iv_value | Desired value
    METHODS computegradienthidden
      IMPORTING
        !iv_function TYPE zca_nn_math=>tv_activation_function
        !iv_value    TYPE float.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.



CLASS zca_nn_neuron IMPLEMENTATION.


  METHOD activateneuron.
    neuron_value = zca_nn_math=>activationfunction( iv_param = iv_function iv_value = neuron_value ).
  ENDMETHOD.


  METHOD computegradient.
    DATA(lv_error) = neuron_value - iv_value.
    DATA(gradient_out) = lv_error.
*    DATA(gradient_out) = 2 * lv_error.
    neuron_gradient = gradient_out * zca_nn_math=>activationfunctionderivate( iv_param = iv_function iv_value = neuron_value ).
  ENDMETHOD.


  METHOD computegradienthidden.
    neuron_gradient = iv_value * zca_nn_math=>activationfunctionderivate( iv_param = iv_function iv_value = neuron_value ).
  ENDMETHOD.


  METHOD constructor.
    layer_number = iv_layernumber.
    neuron_index = iv_neuronindex.
    neuron_value = iv_neuronvalue.
    gt_weights = it_weights.
  ENDMETHOD.


  METHOD set_desired.
    computegradient( iv_function = iv_function iv_value = iv_value ).
  ENDMETHOD.
ENDCLASS.