Fix no escaping for standard escapes in regular expressions (#315)

* Add Escape Sequence Support

* Update escape sequence handling

* Patch linter errors

* Patch linter error

* Update handling of escape sequences in patterns

* Update src/zcl_aff_writer_json_schema.clas.testclasses.abap

Co-authored-by: abaplint[bot] <24845621+abaplint[bot]@users.noreply.github.com>

* Remove PCRE from pattern matching syntax

* Add test for quotes

---------

Co-authored-by: abaplint[bot] <24845621+abaplint[bot]@users.noreply.github.com>

src/zcl_aff_abap_doc_parser.clas.abap

@@ -555,7 +555,7 @@ CLASS zcl_aff_abap_doc_parser IMPLEMENTATION.
 
     DATA(string_to_parse) = abap_doc_string.
 
-    FIND ALL OCCURRENCES OF PCRE `\$pattern[\s]*(:[\s]*)?'([^']*)'` IN string_to_parse RESULTS DATA(result_table).
+    FIND ALL OCCURRENCES OF PCRE `\$pattern[\s]*(:[\s]*)?'(\S*)'` IN string_to_parse RESULTS DATA(result_table).
 
     IF lines( result_table ) = 0.
       DATA(msg) = parser_log->get_message_text( msgno = 109 msgv1 = CONV #( abap_doc_annotation-pattern ) ).

src/zcl_aff_abap_doc_parser.clas.testclasses.abap

@@ -658,7 +658,6 @@ CLASS ltcl_aff_abap_doc_parser IMPLEMENTATION.
                                                               exp_text           = |There are several occurrences of annotation { zcl_aff_abap_doc_parser=>abap_doc_annotation-pattern } . First valid is used|
                                                               exp_type           = zif_aff_log=>c_message_type-info
                                                               exp_component_name = `Component Name` ).
-
   ENDMETHOD.
 
 ENDCLASS.

src/zcl_aff_test_types.clas.abap

@@ -68,7 +68,7 @@ CLASS zcl_aff_test_types DEFINITION
       END OF struc_link_wrong_type.
 
     TYPES:
-    "! $pattern '[a-Z]*'
+    "! $pattern '[a-z]*'
     ty_string TYPE string.
 
     TYPES:
@@ -86,10 +86,30 @@ CLASS zcl_aff_test_types DEFINITION
        BEGIN OF string_pattern_simple,
          "! <p class="shorttext">String with pattern</p>
          "! description
-         "! $pattern '[a-Z]*'
+         "! $pattern '[a-z]*'
          string_pattern TYPE string,
        END OF string_pattern_simple.
 
+    TYPES:
+     "! <p class="shorttext">Structure With Pattern Annotation</p>
+     "! Structure with pattern annotation
+       BEGIN OF string_pattern_escape_sequence,
+         "! <p class="shorttext">String with pattern</p>
+         "! description
+         "! $pattern '\n\t\r'
+         string_pattern TYPE string,
+       END OF string_pattern_escape_sequence.
+
+    TYPES:
+     "! <p class="shorttext">Structure With Pattern Annotation</p>
+     "! Structure with pattern annotation
+       BEGIN OF string_pattern_quotes,
+         "! <p class="shorttext">String with pattern</p>
+         "! description
+         "! $pattern '"\"''
+         string_pattern TYPE string,
+       END OF string_pattern_quotes.
+
     TYPES:
       "! in ST val(I()) only allow integers
       "! $values {@link zcl_aff_test_types.data:co_enum}

src/zcl_aff_writer_json_schema.clas.abap

@@ -441,6 +441,8 @@ CLASS zcl_aff_writer_json_schema IMPLEMENTATION.
       ENDIF.
     ENDIF.
     IF abap_doc-pattern IS NOT INITIAL.
+      REPLACE ALL OCCURRENCES OF '\' IN abap_doc-pattern WITH '\\'.
+      REPLACE ALL OCCURRENCES OF '"' IN abap_doc-pattern WITH '\"'.
       write_tag( |"pattern": "{ abap_doc-pattern }",| ).
     ENDIF.
   ENDMETHOD.

src/zcl_aff_writer_json_schema.clas.testclasses.abap

@@ -561,7 +561,9 @@ CLASS ltcl_json_writer_abap_doc DEFINITION FINAL FOR TESTING
       content_media_type_string FOR TESTING RAISING cx_static_check,
       encoding_type_next_level FOR TESTING RAISING cx_static_check,
       pattern_simple FOR TESTING RAISING cx_static_check,
-      pattern_complex FOR TESTING RAISING cx_static_check.
+      pattern_complex FOR TESTING RAISING cx_static_check,
+      pattern_escape_sequence FOR TESTING RAISING cx_static_check,
+      pattern_with_quotes FOR TESTING RAISING cx_static_check.
 
 ENDCLASS.
 
@@ -2806,7 +2808,7 @@ CLASS ltcl_json_writer_abap_doc IMPLEMENTATION.
     ( `        "title": "String with pattern",` )
     ( `        "description": "description",` )
     ( `        "type": "string", ` )
-    ( `        "pattern": "[a-Z]*" ` )
+    ( `        "pattern": "[a-z]*" ` )
     ( `      } ` )
     ( `   }, ` )
     ( `   "additionalProperties": false ` )
@@ -2832,7 +2834,59 @@ CLASS ltcl_json_writer_abap_doc IMPLEMENTATION.
     ( `        "title": "String with pattern",` )
     ( `        "description": "description",` )
     ( `        "type": "string", ` )
-    ( `        "pattern": "[a-Z]*" ` )
+    ( `        "pattern": "[a-z]*" ` )
+    ( `      } ` )
+    ( `   }, ` )
+    ( `   "additionalProperties": false ` )
+    ( ` } ` )
+    ( ) ).
+    zcl_aff_tools_unit_test_helper=>assert_equals_ignore_spaces( act_data = act_schema exp_data = exp_schema ).
+    log = cut->zif_aff_writer~get_log( ).
+    zcl_aff_tools_unit_test_helper=>assert_log_has_no_message( log = log message_severity_threshold = zif_aff_log=>c_message_type-info ).
+  ENDMETHOD.
+
+  METHOD pattern_escape_sequence.
+    DATA(act_schema) = test_generator->generate_type( VALUE zcl_aff_test_types=>string_pattern_escape_sequence( ) ).
+    DATA(exp_schema) = VALUE string_table(
+    ( `   { ` )
+    ( |    "$comment": "This file is autogenerated, do not edit manually, see { zcl_aff_writer_json_schema=>c_link_to_repository } for more information.", | )
+    ( |    "$schema": "{ zcl_aff_writer_json_schema=>c_schema_specification }",| )
+    ( |    "$id": "{ schema_id }",| )
+    ( `    "title": "Structure With Pattern Annotation", ` )
+    ( `    "description": "Structure with pattern annotation", ` )
+    ( `    "type": "object", ` )
+    ( `    "properties": { ` )
+    ( `      "stringPattern": { ` )
+    ( `        "title": "String with pattern",` )
+    ( `        "description": "description",` )
+    ( `        "type": "string", ` )
+    ( `        "pattern": "\\n\\t\\r" ` )
+    ( `      } ` )
+    ( `   }, ` )
+    ( `   "additionalProperties": false ` )
+    ( ` } ` )
+    ( ) ).
+    zcl_aff_tools_unit_test_helper=>assert_equals_ignore_spaces( act_data = act_schema exp_data = exp_schema ).
+    log = cut->zif_aff_writer~get_log( ).
+    zcl_aff_tools_unit_test_helper=>assert_log_has_no_message( log = log message_severity_threshold = zif_aff_log=>c_message_type-info ).
+  ENDMETHOD.
+
+  METHOD pattern_with_quotes.
+    DATA(act_schema) = test_generator->generate_type( VALUE zcl_aff_test_types=>string_pattern_quotes( ) ).
+    DATA(exp_schema) = VALUE string_table(
+    ( `   { ` )
+    ( |    "$comment": "This file is autogenerated, do not edit manually, see { zcl_aff_writer_json_schema=>c_link_to_repository } for more information.", | )
+    ( |    "$schema": "{ zcl_aff_writer_json_schema=>c_schema_specification }",| )
+    ( |    "$id": "{ schema_id }",| )
+    ( `    "title": "Structure With Pattern Annotation", ` )
+    ( `    "description": "Structure with pattern annotation", ` )
+    ( `    "type": "object", ` )
+    ( `    "properties": { ` )
+    ( `      "stringPattern": { ` )
+    ( `        "title": "String with pattern",` )
+    ( `        "description": "description",` )
+    ( `        "type": "string", ` )
+    ( `        "pattern": "\"\\\"'" ` )
     ( `      } ` )
     ( `   }, ` )
     ( `   "additionalProperties": false ` )