Add check 102 to detect SY-SYSID usage

docs/_checks/102.md

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+---
+title: Use of system ID
+cNumber: CHECK_102
+rfc: true
+index: 102
+---
+
+Coupling your logic to the name of the SAP system (`SY-SYSID`) is generally a bad idea. Use this check to find all uses of the system ID.

src/checks/zcl_aoc_check_102.clas.abap

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+"! <p class="shorttext synchronized">102 - Use of system ID</p>
+CLASS zcl_aoc_check_102 DEFINITION
+  PUBLIC
+  INHERITING FROM zcl_aoc_super
+  FINAL.
+
+  PUBLIC SECTION.
+    METHODS constructor.
+
+    METHODS check REDEFINITION.
+ENDCLASS.
+
+
+CLASS zcl_aoc_check_102 IMPLEMENTATION.
+  METHOD constructor.
+    super->constructor( ).
+
+    version = '001'.
+    position = '102'.
+
+    has_attributes = abap_true.
+    attributes_ok  = abap_true.
+
+    enable_rfc( ).
+
+    insert_scimessage( iv_code = gc_code-usage_uncategorized
+                       iv_text = TEXT-001 ).
+    insert_scimessage( iv_code = gc_code-in_condition
+                       iv_text = TEXT-002 ).
+    insert_scimessage( iv_code = gc_code-first_letter_used
+                       iv_text = TEXT-003 ).
+    insert_scimessage( iv_code = gc_code-as_default_value
+                       iv_text = TEXT-004 ).
+    insert_scimessage( iv_code = gc_code-in_concatenate
+                       iv_text = TEXT-005 ).
+    insert_scimessage( iv_code = gc_code-overridden
+                       iv_text = TEXT-006 ).
+    insert_scimessage( iv_code = gc_code-assigned_to_variable
+                       iv_text = TEXT-007 ).
+    insert_scimessage( iv_code = gc_code-in_database_select
+                       iv_text = TEXT-008 ).
+    insert_scimessage( iv_code = gc_code-in_write
+                       iv_text = TEXT-009 ).
+    insert_scimessage( iv_code = gc_code-in_message
+                       iv_text = TEXT-010 ).
+    insert_scimessage( iv_code = gc_code-within_macro
+                       iv_text = TEXT-011 ).
+  ENDMETHOD.
+
+  METHOD check.
+    " abapOpenChecks
+    " https://github.com/larshp/abapOpenChecks
+    " MIT License
+
+    DATA(lo_helper) = NEW lcl_check_helper( io_scan ).
+
+    LOOP AT io_scan->statements ASSIGNING FIELD-SYMBOL(<ls_statement>).
+      LOOP AT io_scan->tokens ASSIGNING FIELD-SYMBOL(<ls_token>)
+           FROM <ls_statement>-from TO <ls_statement>-to
+           WHERE str CP 'SY-SYSID*'
+              OR str CP '@SY-SYSID*'.
+
+        DATA(lv_index_token) = sy-tabix.
+
+        DATA(lv_error_code) = lo_helper->determine_error_code( is_token       = <ls_token>
+                                                               iv_index_token = lv_index_token
+                                                               is_statement   = <ls_statement> ).
+
+        IF lv_error_code IS INITIAL.
+          " No error
+          CONTINUE.
+        ENDIF.
+
+        DATA(lv_include) = io_scan->get_include( <ls_statement>-level ).
+
+        inform( p_sub_obj_name = lv_include
+                p_line         = <ls_token>-row
+                p_kind         = mv_errty
+                p_test         = myname
+                p_code         = lv_error_code ).
+      ENDLOOP.
+    ENDLOOP.
+  ENDMETHOD.
+ENDCLASS.

src/checks/zcl_aoc_check_102.clas.locals_def.abap

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+CONSTANTS:
+  BEGIN OF gc_code,
+    usage_uncategorized  TYPE sci_errc VALUE '001',
+    in_condition         TYPE sci_errc VALUE '002',
+    first_letter_used    TYPE sci_errc VALUE '003',
+    as_default_value     TYPE sci_errc VALUE '004',
+    in_concatenate       TYPE sci_errc VALUE '005',
+    overridden           TYPE sci_errc VALUE '006',
+    assigned_to_variable TYPE sci_errc VALUE '007',
+    in_database_select   TYPE sci_errc VALUE '008',
+    in_write             TYPE sci_errc VALUE '009',
+    in_message           TYPE sci_errc VALUE '010',
+    within_macro         TYPE sci_errc VALUE '011',
+  END OF gc_code.
+
+CLASS lcl_check_helper DEFINITION.
+
+  PUBLIC SECTION.
+    METHODS constructor
+      IMPORTING
+        io_scan TYPE REF TO zcl_aoc_scan.
+
+    METHODS determine_error_code
+      IMPORTING
+        is_token             TYPE stokesx
+        iv_index_token       TYPE sy-tabix
+        is_statement         TYPE sstmnt
+      RETURNING
+        VALUE(rv_error_code) TYPE sci_errc.
+
+  PRIVATE SECTION.
+    DATA mo_scan TYPE REF TO zcl_aoc_scan.
+
+    METHODS is_using_only_first_letter
+      IMPORTING
+        is_token         TYPE stokesx
+      RETURNING
+        VALUE(rv_result) TYPE abap_bool.
+
+    METHODS is_used_in_macro
+      IMPORTING
+        is_statement     TYPE sstmnt
+      RETURNING
+        VALUE(rv_result) TYPE abap_bool.
+ENDCLASS.

src/checks/zcl_aoc_check_102.clas.locals_imp.abap

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+CLASS lcl_check_helper IMPLEMENTATION.
+  METHOD constructor.
+    mo_scan = io_scan.
+  ENDMETHOD.
+
+  METHOD determine_error_code.
+    IF is_using_only_first_letter( is_token ) = abap_true.
+      rv_error_code = gc_code-first_letter_used.
+      RETURN.
+    ENDIF.
+
+    IF is_used_in_macro( is_statement ) = abap_true.
+      rv_error_code = gc_code-within_macro.
+      RETURN.
+    ENDIF.
+
+    ASSIGN mo_scan->tokens[ is_statement-from ] TO FIELD-SYMBOL(<ls_first_token_of_statement>).
+
+    CASE <ls_first_token_of_statement>-str.
+      WHEN zcl_aoc_scan=>gc_keyword-types
+          OR zcl_aoc_scan=>gc_keyword-ranges.
+        " Ignore
+        RETURN.
+      WHEN zcl_aoc_scan=>gc_keyword-concatenate.
+        rv_error_code = gc_code-in_concatenate.
+      WHEN is_token-str.
+        rv_error_code = gc_code-overridden.
+      WHEN zcl_aoc_scan=>gc_keyword-select.
+        rv_error_code = gc_code-in_database_select.
+      WHEN zcl_aoc_scan=>gc_keyword-write.
+        rv_error_code = gc_code-in_write.
+      WHEN zcl_aoc_scan=>gc_keyword-message.
+        rv_error_code = gc_code-in_message.
+      WHEN zcl_aoc_scan=>gc_keyword-if
+          OR zcl_aoc_scan=>gc_keyword-elseif
+          OR zcl_aoc_scan=>gc_keyword-case
+          OR zcl_aoc_scan=>gc_keyword-when
+          OR zcl_aoc_scan=>gc_keyword-check
+          OR zcl_aoc_scan=>gc_keyword-assert.
+        rv_error_code = gc_code-in_condition.
+      WHEN zcl_aoc_scan=>gc_keyword-methods
+          OR zcl_aoc_scan=>gc_keyword-class_methods
+          OR zcl_aoc_scan=>gc_keyword-data
+          OR zcl_aoc_scan=>gc_keyword-class_data.
+        ASSIGN mo_scan->tokens[ iv_index_token - 1 ] TO FIELD-SYMBOL(<ls_token_before_sysid>).
+
+        CASE <ls_token_before_sysid>-str.
+          WHEN zcl_aoc_scan=>gc_keyword-default.
+            rv_error_code = gc_code-as_default_value.
+          WHEN zcl_aoc_scan=>gc_keyword-like
+              OR zcl_aoc_scan=>gc_keyword-type.
+            " Ignore
+            RETURN.
+        ENDCASE.
+      WHEN OTHERS.
+        READ TABLE mo_scan->tokens ASSIGNING <ls_token_before_sysid> INDEX iv_index_token - 1.
+
+        IF <ls_token_before_sysid>-str = '='
+            AND iv_index_token - is_statement-from = 2.
+          rv_error_code = gc_code-assigned_to_variable.
+        ELSE.
+          rv_error_code = gc_code-usage_uncategorized.
+        ENDIF.
+    ENDCASE.
+  ENDMETHOD.
+
+  METHOD is_using_only_first_letter.
+    CASE is_token-str.
+      WHEN 'SY-SYSID+0(1)' OR 'SY-SYSID(1)'.
+        rv_result = abap_true.
+    ENDCASE.
+  ENDMETHOD.
+
+  METHOD is_used_in_macro.
+    ASSIGN mo_scan->tokens[ is_statement-to + 1 ] TO FIELD-SYMBOL(<ls_token_after_statement>).
+
+    IF sy-subrc = 0
+        AND <ls_token_after_statement>-str = zcl_aoc_scan=>gc_keyword-end_of_definition.
+      rv_result = abap_true.
+    ENDIF.
+  ENDMETHOD.
+ENDCLASS.