add parser

NlpParser/Nlp.g4

@@ -0,0 +1,28 @@
+grammar Nlp;
+
+nlp_document: LANG_HEADER (section)* ;
+
+section: SECTION_HEAD (sub_section | entry)* ;
+
+sub_section: SUB_SECTION_HEAD (entry)* ;
+
+entry: ENTRY_STRING                             # entry_string_t
+| ENTRY_STRING (LINE_CONCAT ENTRY_STRING)+      # entry_concated_string_t
+| ENTRY_INTEGER                                 # entry_integer_t
+;
+
+LANG_HEADER: 'Language:' [a-zA-Z]+ ;
+
+SECTION_HEAD: '[' NAME_SECTION ']' ;
+SUB_SECTION_HEAD: '<' NAME_SECTION '>' ;
+fragment NAME_SECTION: [ a-zA-Z0-9]+ ;   // section name are consisted of space, char and number
+
+ENTRY_STRING: '"' (STRING_ESC|.)*? '"' ;
+fragment STRING_ESC: '\\"' | '\\\\' ; 
+
+ENTRY_INTEGER: [1-9][0-9]+ ;
+
+SPLITTOR: [ ,;\r\n]+ -> skip;               // ignore all splittor and space
+LINE_CONCAT: '\\' ;
+LINE_COMMENT: '//' ~[\r\n]* -> skip ;       // consume all non-line-breaker. because we need line breaker.
+BLOCK_COMMENT: '/*' .*? '*/' -> skip ;