Parse JSON without array name into internal table

[ashok_mohan]

I my report program there is a json string.

[{"duration":258,"length":2051,"status":6},{"duration":333,"length":1623,"status":6},{"duration":523,"length":3367,"status":6},{"duration":540,"length":2921,"status":6},{"duration":380,"length":1302,"status":6},{"duration":1008,"length":4570,"status":6},{"duration":271,"length":1942,"status":6},{"duration":629,"length":3981,"status":6},{"duration":925,"length":4280,"status":6},{"duration":646,"length":3895,"status":6},{"duration":923,"length":4839,"status":6},{"duration":611,"length":2896,"status":6},{"duration":692,"length":3143,"status":6},{"duration":747,"length":3307,"status":6},{"duration":380,"length":2414,"status":6},{"duration":1125,"length":4977,"status":6},{"duration":484,"length":5832,"status":6},{"duration":384,"length":1229,"status":6},{"duration":459,"length":3908,"status":6},{"duration":1216,"length":4664,"status":6},{"duration":299,"length":2244,"status":6},{"duration":751,"length":3442,"status":6},{"duration":1487,"length":6676,"status":6},{"duration":1022,"length":5333,"status":6},{"duration":1620,"length":6792,"status":6},{"duration":1241,"length":6961,"status":6},{"duration":741,"length":4309,"status":6},{"duration":1540,"length":6069,"status":6},{"duration":1578,"length":6580,"status":6},{"duration":890,"length":5754,"status":6},{"duration":488,"length":2902,"status":6},{"duration":288,"length":2785,"status":6},{"duration":562,"length":2016,"status":6},{"duration":756,"length":3454,"status":6},{"duration":478,"length":3712,"status":6},{"duration":1291,"length":4702,"status":6},{"duration":734,"length":5289,"status":6},{"duration":719,"length":4823,"status":6},{"duration":1481,"length":7950,"status":6},{"duration":435,"length":3299,"status":6},{"duration":207,"length":1704,"status":6},{"duration":1197,"length":5029,"status":6},{"duration":561,"length":4100,"status":6},{"duration":609,"length":6206,"status":6},{"duration":858,"length":5799,"status":6},{"duration":1098,"length":8816,"status":6},{"duration":2024,"length":10465,"status":6},{"duration":2649,"length":9847,"status":6},{"duration":1106,"length":8252,"status":6},{"duration":608,"length":3442,"status":6},{"duration":717,"length":4396,"status":6},{"duration":852,"length":6764,"status":6},{"duration":651,"length":5122,"status":6},{"duration":1657,"length":6967,"status":6},{"duration":1059,"length":5298,"status":6},{"duration":1730,"length":8068,"status":6},{"duration":1444,"length":7038,"status":6},{"duration":908,"length":7140,"status":6},{"duration":663,"length":6908,"status":6},{"duration":663,"length":6908,"status":6}]

But here, there is no array name. I have created an internal table with the fields duration, length and name. I want to save the data on to the internal table. When I do CALL TRANSFORMATION it results in  runtime error.  Can anyone tell how to move these values to the internal table?

[former_member202253]

Hello Ashok,

Please find below code,

Let me know if that's work for you...

Pass the table which has all required field.

	CALL METHOD json2abap
	EXPORTING
	json_string = jsondata
	var_name	= 'items'
	CHANGING
	abap_data   = lt_order_data.

method JSON2ABAP.

*/************************************************/*

*/ Input any abap data and this method tries to   /*

*/ fill it with the data in the JSON string.      /*

*/  Thanks to Juan Diaz for helping here!!        /*

*/************************************************/*

  type-pools: abap, js.

  data:

    js_script type string,

    js_started type i value 0,

    l_json_string type string,

    js_property_table type   js_property_tab,

    js_property type line of js_property_tab,

    l_property_path type string,

    item_path type string.

  data:

    l_type  type c,

    l_value type string,

    linetype type string,

    l_comp type line of ABAP_COMPDESCR_TAB.

  data:

    datadesc type ref to CL_ABAP_TYPEDESCR,

    drefdesc type ref to CL_ABAP_TYPEDESCR,

    linedesc type ref to CL_ABAP_TYPEDESCR,

    strudesc type ref to CL_ABAP_STRUCTDESCR,

    tabldesc type ref to CL_ABAP_TABLEDESCR.

  data newline type ref to data.

  field-symbols:

    <abap_data> type any,

    <itab> type any table,

    <comp> type any,

    <jsprop> type line of js_property_tab,

    <abapcomp> type abap_compdescr.

  define assign_scalar_value.

    "   &1   <abap_data>

    "   &2   js_property-value

    describe field &1 type l_type.

    l_value = &2.

* convert or adapt scalar values to ABAP.

    case l_type.

      when 'D'. " date type

        if l_value cs '-'.

          replace all occurrences of '-' in l_value with space.

          condense l_value no-gaps.

        endif.

      when 'T'. " time type

        if l_value cs ':'.

          replace all occurrences of ':' in l_value with space.

          condense l_value no-gaps.

        endif.

      when others.

        " may be other conversions or checks could be implemented here.

    endcase.

    &1 = l_value.

  end-of-definition.

  if js_object is not bound.

    if json_string is initial. exit. endif. " exit method if there is nothing to parse

    l_json_string = json_string.

    js_object = cl_java_script=>create( ).

***************************************************

*  Parse JSON using JavaScript                    *

***************************************************

    js_object->bind( exporting name_obj = 'abap_data' name_prop = 'json_string'    changing data = l_json_string ).

    js_object->bind( exporting name_obj = 'abap_data' name_prop = 'script_started' changing data = js_started ).

* We use the JavaScript engine included in ABAP to read the JSON string.

* We simply use the recommended way to eval a JSON string as specified

* in RFC 4627 (http://www.ietf.org/rfc/rfc4627.txt).

*

* Security considerations:

*

*   Generally there are security issues with scripting languages.  JSON

*   is a subset of JavaScript, but it is a safe subset that excludes

*   assignment and invocation.

*

*   A JSON text can be safely passed into JavaScript's eval() function

*   (which compiles and executes a string) if all the characters not

*   enclosed in strings are in the set of characters that form JSON

*   tokens.  This can be quickly determined in JavaScript with two

*   regular expressions and calls to the test and replace methods.

*

*      var my_JSON_object = !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(

*             text.replace(/"(\\.|[^"\\])*"/g, ''))) &&

*         eval('(' + text + ')');

    concatenate

         'var json_obj; '

         'var json_text; '

         'function start() { '

         '  if(abap_data.script_started) { return; } '

         '  json_text = abap_data.json_string;'

         '  json_obj = !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test( '

         '      json_text.replace(/"(\\.|[^"\\])*"/g, ''''))) && '

         '    eval(''('' + json_text + '')''); '

         '  abap_data.script_started = 1; '

         '} '

         'if(!abap_data.script_started) start(); '

       into js_script respecting blanks separated by xnl.

    js_object->compile( script_name = 'json_parser'     script = js_script ).

    js_object->execute( script_name = 'json_parser' ).

    if js_object->last_error_message is not initial.

      " RAISE EXCEPTION

    endif.

  endif.

*

* Get ABAP data type, dereference if necessary and start

  datadesc = cl_abap_typedescr=>DESCRIBE_BY_DATA( abap_data ).

  if datadesc->kind eq cl_abap_typedescr=>kind_ref.

    assign abap_data->* to <abap_data>.

  else.

    assign abap_data to <abap_data>.

  endif.

  datadesc = cl_abap_typedescr=>DESCRIBE_BY_DATA( <abap_data> ).

**

  if var_name is not initial.

    concatenate property_path var_name into l_property_path separated by '.'.

  else.

    l_property_path = property_path.

  endif.

**

  js_property_table = js_object->get_properties_scope_global( property_path = l_property_path ).

* If the table is empty, try with the lowercase name of the param, to increase the chances of a match.

  if js_property_table is initial.

    translate l_property_path to lower case.

    js_property_table = js_object->get_properties_scope_global( property_path = l_property_path ).

  endif.

  case datadesc->kind.

    when cl_abap_typedescr=>kind_elem.

* Scalar: process ABAP elements. Assume no type conversions for the moment.

      if var_name is initial.

        RAISE EXCEPTION type zcx_json

          EXPORTING

            message = 'VAR_NAME is required for scalar values.'.

      endif.

      js_property_table = js_object->get_properties_scope_global( property_path = property_path ).

      read table js_property_table with key name = var_name into js_property.

      if sy-subrc eq 0.

        assign_scalar_value <abap_data> js_property-value.

      endif.

    when cl_abap_typedescr=>kind_struct.

* Translate JS properties to upper case. This is risky, but necessary

* if we want a little interoperability with ABAP structures.

      loop at js_property_table assigning <jsprop>.

        translate <jsprop>-name to upper case.

      endloop.

* Process ABAP structures

      strudesc ?= datadesc.

      loop at strudesc->COMPONENTS into l_comp.

        assign component l_comp-name of structure <abap_data> to <comp>.

        case l_comp-type_kind.

          when    cl_abap_typedescr=>TYPEKIND_STRUCT1  " 'v'

               or cl_abap_typedescr=>TYPEKIND_STRUCT2  " 'u'

               or cl_abap_typedescr=>TYPEKIND_TABLE.   " 'h' (may need a different treatment one day)

            concatenate l_property_path l_comp-name into item_path separated by '.'.

*> Recursive call here

            json2abap( exporting property_path = item_path changing abap_data = <comp> js_object = js_object ).

**        when cl_abap_typedescr=>TYPEKIND_TABLE. " 'h' (may need a different treatment one day)

          when others.

* Process scalars in structures (same as the kind_elem above)

            read table js_property_table with key name = l_comp-name into js_property.

            if sy-subrc eq 0.

              assign_scalar_value <comp> js_property-value.

            endif.

        endcase.

      endloop.

    when cl_abap_typedescr=>kind_table.

* Process ABAP tables

      if js_property_table is not initial.

        tabldesc ?= datadesc.

        linedesc = tabldesc->get_table_line_type( ).

        linetype = linedesc->get_relative_name( ).

        assign <abap_data> to <itab>.

        DELETE js_property_table WHERE kind NE 'O'.

        loop at js_property_table into js_property.

          create data newline type (linetype).

          concatenate l_property_path js_property-name into item_path separated by '.'.

          condense item_path.

*> Recursive call here

          json2abap( exporting property_path = item_path changing abap_data = newline js_object = js_object ).

          assign newline->* to <comp>.

          insert <comp> into table <itab>.

          free newline.

        endloop.

      endif.

    when others. " kind_class, kind_intf

      " forget it.

  endcase.

endmethod.

Hopefully this will help.

Thanks,

Nikhil