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|
grammar osmo_codegen;
//options {
//language = Python;
//}
root :
(pdu_spec | ie_spec | ie_alias)*
;
ie_alias: 'ie_alias' ie_name ie_name;
ie_name : ID;
ie_spec : 'ie_spec' ID
ie_field_def*
'end_ie_spec'
;
ie_field_def
: ie_field_name ie_field_len ie_field_type ie_field_opts
;
ie_field_name
: ID;
ie_field_len
: (NUMERIC | '*');
ie_field_type
: ('byte' | 'bytes' | 'bit' | 'bits' | 'bcd');
ie_field_opts
: field_val? ie_field_cond? ie_field_endian?;
ie_field_cond
: 'if (' ie_field_name COMP_OP NUMERIC ')';
ie_field_endian
: ('big' | 'little');
/* PDU */
pdu_spec
: 'pdu_spec' ID
pdu_field_def*
'end_pdu_spec'
;
pdu_field_mode
: 'mand' | 'opt' | 'cond';
field_val
: ('val'|'value') NUMERIC;
field_tag
: 'tag' NUMERIC;
pdu_field_size
: NUMERIC ('-' NUMERIC)? ;
pdu_field_opts
: ('uplink_only' | 'downlink_only')
;
pdu_field_type
: (
('V4u' field_val?)
| ('V4l' field_val?)
| ('V' pdu_field_size field_val?)
| ('TLV' pdu_field_size? field_val? field_tag)
| ('LV' pdu_field_size field_val?)
| ('TV' pdu_field_size field_val? field_tag)
| ('T' field_val? field_tag)
| ('TV4' field_val? field_tag)
) pdu_field_opts*;
pdu_field_def
: ID pdu_field_mode pdu_field_type;
/* LEXER RULES */
fragment
NEWLINE : '\r'? '\n';
ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
;
NUMERIC : INT | HEX ;
COMMENT
: '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
| '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
| '#' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
WS : ( ' '
| '\t'
| '\r'
| '\n'
) {$channel=HIDDEN;}
;
STRING
: '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
;
COMP_OP : '==' | '<' | '>' | '>=' | '<=' | '!=';
fragment
HEX_DIGIT : ('0'..'9'|'a'..'f'|'A'..'F') ;
fragment
ESC_SEQ
: '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\')
| UNICODE_ESC
| OCTAL_ESC
;
fragment
OCTAL_ESC
: '\\' ('0'..'3') ('0'..'7') ('0'..'7')
| '\\' ('0'..'7') ('0'..'7')
| '\\' ('0'..'7')
;
fragment
UNICODE_ESC
: '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
;
fragment
INT : '0'..'9'+
;
fragment
HEX : '0x' HEX_DIGIT+
;
|
