Rfc5424.g4

/*
 * Copyright 2018-2021 simple-syslog authors
 * All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


grammar Rfc5424;

@header {
//CHECKSTYLE:OFF
/*
 * Copyright 2018-2022 simple-syslog authors
 * All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

}

 heroku_https_log_drain : octet_prefix sp header (sp)? (msg)? #herokuHttpsMsg;

 octet_prefixed  : octet_prefix sp syslog_msg;

 syslog_msg      : header sp structured_data (sp)? (bom)? (msg)? #syslogMsg;

 octet_prefix    : nonzero_digit digit*;

 header          : pri? version? sp? timestamp sp hostname sp app_name sp procid sp msgid #syslogHeader;

 pri             : LESS_THAN prival GREATER_THAN #headerPriority
 ;

 prival          : digit (digit? | (digit digit)) #headerPriorityValue
 ;

 version         : nonzero_digit  (digit? | (digit digit))#headerVersion
 ;

 hostname        : nilvalue #headerNilHostName
 | printusascii* #headerHostName
 ;

 app_name        : nilvalue  #headerNilAppName
 | printusascii* #headerAppName
 ;

 procid          : nilvalue #headerNilProcId
 | printusascii* #headerProcId
 ;

 msgid           : nilvalue #headerNilMsgId
 | printusascii* #headerMsgId
 ;

 timestamp       : nilvalue #headerNilTimestamp
 | (full_date CAP_T full_time) #headerTimeStamp
 ;

 full_date       : date_fullyear DASH date_month DASH date_mday ;

 date_fullyear   : digit digit digit digit ;

 date_month      : digit digit  ;

 date_mday       : digit digit ;

 full_time       : partial_time time_offset ;

 partial_time    : time_hour COLON time_minute COLON time_second (time_secfrac)? ;

 time_hour       : digit digit ;

 time_minute     : digit digit ;

 time_second     : digit digit ;

 time_secfrac    :PERIOD digit (digit? | (digit digit) | (digit digit digit) | (digit digit digit digit) | (digit digit digit digit digit));

 time_offset     : CAP_Z | time_numoffset;

 time_numoffset  : (PLUS | DASH) time_hour COLON time_minute;


 structured_data : nilvalue
 | LEFT_BRACE sd_element RIGHT_BRACE (LEFT_BRACE sd_element RIGHT_BRACE)*
 ;

 sd_element      : sd_id (sp sd_param)* #sdElement;

 sd_param        : param_name EQUALS QUOTE param_value QUOTE #sdParam;

 sd_id           : sd_name ;

 param_name      : sd_name #paramName;

 param_value     : (~('"' | '\\' | ']' ) | '\\' ('"' | '\\' | ']'))* #paramValue;

 sd_name         : printusasciinospecials* ;

 msg          :msg_utf8 #msgUTF8
 ;

 //msg_any         : octet*;

 msg_utf8        : utf_8_string;

 bom             : (U_00EF U_00BB U_00BF) | U_FEFF;
 utf_8_string    : octet*;

 octet           : (U_0000 | U_0001 | U_0002 | U_0003 | U_0004 | U_0005 | U_0006 | U_0007 | U_0008 | TAB | LF | U_000B | U_000C | CR | U_000E | U_000F | U_0010 | U_0011 | U_0012 | U_0013 | U_0014 | U_0015 | U_0016 | U_0017 | U_0018 | U_0019 | U_001A | U_001B | U_001C | U_001D | U_001E | U_001F | SPACE | EXCLAMATION | QUOTE | POUND | DOLLAR | PERCENT | AMPERSAND | APOSTROPHE | LEFT_PAREN | RIGHT_PAREN | ASTERISK | PLUS | COMMA | DASH | PERIOD | SLASH | ZERO | ONE | TWO | THREE | FOUR | FIVE | SIX | SEVEN | EIGHT | NINE | COLON | SEMICOLON | LESS_THAN | EQUALS | GREATER_THAN | QUESTION | AT | CAP_A | CAP_B | CAP_C | CAP_D | CAP_E | CAP_F | CAP_G | CAP_H | CAP_I | CAP_J | CAP_K | CAP_L | CAP_M | CAP_N | CAP_O | CAP_P | CAP_Q | CAP_R | CAP_S | CAP_T | CAP_U | CAP_V | CAP_W | CAP_X | CAP_Y | CAP_Z | LEFT_BRACE | BACKSLASH | RIGHT_BRACE | CARAT | UNDERSCORE | ACCENT | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | LEFT_CURLY_BRACE | PIPE | RIGHT_CURLY_BRACE | TILDE | U_007F | U_0080 | U_0081 | U_0082 | U_0083 | U_0084 | U_0085 | U_0086 | U_0087 | U_0088 | U_0089 | U_008A | U_008B | U_008C | U_008D | U_008E | U_008F | U_0090 | U_0091 | U_0092 | U_0093 | U_0094 | U_0095 | U_0096 | U_0097 | U_0098 | U_0099 | U_009A | U_009B | U_009C | U_009D | U_009E | U_009F | U_00A0 | U_00A1 | U_00A2 | U_00A3 | U_00A4 | U_00A5 | U_00A6 | U_00A7 | U_00A8 | U_00A9 | U_00AA | U_00AB | U_00AC | U_00AD | U_00AE | U_00AF | U_00B0 | U_00B1 | U_00B2 | U_00B3 | U_00B4 | U_00B5 | U_00B6 | U_00B7 | U_00B8 | U_00B9 | U_00BA | U_00BB | U_00BC | U_00BD | U_00BE | U_00BF | U_00C0 | U_00C1 | U_00C2 | U_00C3 | U_00C4 | U_00C5 | U_00C6 | U_00C7 | U_00C8 | U_00C9 | U_00CA | U_00CB | U_00CC | U_00CD | U_00CE | U_00CF | U_00D0 | U_00D1 | U_00D2 | U_00D3 | U_00D4 | U_00D5 | U_00D6 | U_00D7 | U_00D8 | U_00D9 | U_00DA | U_00DB | U_00DC | U_00DD | U_00DE | U_00DF | U_00E0 | U_00E1 | U_00E2 | U_00E3 | U_00E4 | U_00E5 | U_00E6 | U_00E7 | U_00E8 | U_00E9 | U_00EA | U_00EB | U_00EC | U_00ED | U_00EE | U_00EF | U_00F0 | U_00F1 | U_00F2 | U_00F3 | U_00F4 | U_00F5 | U_00F6 | U_00F7 | U_00F8 | U_00F9 | U_00FA | U_00FB | U_00FC | U_00FD | U_00FE | U_00FF);

 sp              : SPACE;

 printusascii    : (EXCLAMATION | QUOTE | POUND | DOLLAR | PERCENT | AMPERSAND | APOSTROPHE | LEFT_PAREN | RIGHT_PAREN | ASTERISK | PLUS | COMMA | DASH | PERIOD | SLASH | ZERO | ONE | TWO | THREE | FOUR | FIVE | SIX | SEVEN | EIGHT | NINE | COLON | SEMICOLON | LESS_THAN | EQUALS | GREATER_THAN | QUESTION | AT | CAP_A | CAP_B | CAP_C | CAP_D | CAP_E | CAP_F | CAP_G | CAP_H | CAP_I | CAP_J | CAP_K | CAP_L | CAP_M | CAP_N | CAP_O | CAP_P | CAP_Q | CAP_R | CAP_S | CAP_T | CAP_U | CAP_V | CAP_W | CAP_X | CAP_Y | CAP_Z | LEFT_BRACE | BACKSLASH | RIGHT_BRACE | CARAT | UNDERSCORE | ACCENT | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | LEFT_CURLY_BRACE | PIPE | RIGHT_CURLY_BRACE | TILDE);

 printusasciinospecials    : (EXCLAMATION | POUND | DOLLAR | PERCENT | AMPERSAND | APOSTROPHE | LEFT_PAREN | RIGHT_PAREN | ASTERISK | PLUS | COMMA | DASH | PERIOD | SLASH | ZERO | ONE | TWO | THREE | FOUR | FIVE | SIX | SEVEN | EIGHT | NINE | COLON | SEMICOLON | LESS_THAN | GREATER_THAN | QUESTION | AT | CAP_A | CAP_B | CAP_C | CAP_D | CAP_E | CAP_F | CAP_G | CAP_H | CAP_I | CAP_J | CAP_K | CAP_L | CAP_M | CAP_N | CAP_O | CAP_P | CAP_Q | CAP_R | CAP_S | CAP_T | CAP_U | CAP_V | CAP_W | CAP_X | CAP_Y | CAP_Z | LEFT_BRACE | BACKSLASH | CARAT | UNDERSCORE | ACCENT | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | LEFT_CURLY_BRACE | PIPE | RIGHT_CURLY_BRACE | TILDE);

 nonzero_digit   : (ONE | TWO | THREE | FOUR | FIVE | SIX | SEVEN | EIGHT | NINE);

 digit           : ZERO #zeroDigit
 | nonzero_digit #nonZeroDigit
 ;

 nilvalue        : DASH;

//////////////////////////////////////////////////////////////////////////
// Lexer rules generated for each distinct character in original grammar
// per http://www.unicode.org/charts/PDF/U0000.pdf
//////////////////////////////////////////////////////////////////////////

TAB : '\\u0009';
LF : '\\u000A';
CR : '\\u000D';
SPACE : ' ';
EXCLAMATION : '!';
QUOTE : '"';
POUND : '#';
DOLLAR : '$';
PERCENT : '%';
AMPERSAND : '&';
APOSTROPHE : '\'';
LEFT_PAREN : '(';
RIGHT_PAREN : ')';
ASTERISK : '*';
PLUS : '+';
COMMA : ',';
DASH : '-';
PERIOD : '.';
SLASH : '/';
ZERO : '0';
ONE : '1';
TWO : '2';
THREE : '3';
FOUR : '4';
FIVE : '5';
SIX : '6';
SEVEN : '7';
EIGHT : '8';
NINE : '9';
COLON : ':';
SEMICOLON : ';';
LESS_THAN : '<';
EQUALS : '=';
GREATER_THAN : '>';
QUESTION : '?';
AT : '@';
CAP_A : 'A';
CAP_B : 'B';
CAP_C : 'C';
CAP_D : 'D';
CAP_E : 'E';
CAP_F : 'F';
CAP_G : 'G';
CAP_H : 'H';
CAP_I : 'I';
CAP_J : 'J';
CAP_K : 'K';
CAP_L : 'L';
CAP_M : 'M';
CAP_N : 'N';
CAP_O : 'O';
CAP_P : 'P';
CAP_Q : 'Q';
CAP_R : 'R';
CAP_S : 'S';
CAP_T : 'T';
CAP_U : 'U';
CAP_V : 'V';
CAP_W : 'W';
CAP_X : 'X';
CAP_Y : 'Y';
CAP_Z : 'Z';
LEFT_BRACE : '[';
BACKSLASH : '\\';
RIGHT_BRACE : ']';
CARAT : '^';
UNDERSCORE : '_';
ACCENT : '`';
A : 'a';
B : 'b';
C : 'c';
D : 'd';
E : 'e';
F : 'f';
G : 'g';
H : 'h';
I : 'i';
J : 'j';
K : 'k';
L : 'l';
M : 'm';
N : 'n';
O : 'o';
P : 'p';
Q : 'q';
R : 'r';
S : 's';
T : 't';
U : 'u';
V : 'v';
W : 'w';
X : 'x';
Y : 'y';
Z : 'z';
LEFT_CURLY_BRACE : '{';
PIPE : '|';
RIGHT_CURLY_BRACE : '}';
TILDE : '~';
U_0000 : '\u0000';
U_0001 : '\u0001';
U_0002 : '\u0002';
U_0003 : '\u0003';
U_0004 : '\u0004';
U_0005 : '\u0005';
U_0006 : '\u0006';
U_0007 : '\u0007';
U_0008 : '\u0008';
U_000B : '\u000B';
U_000C : '\u000C';
U_000E : '\u000E';
U_000F : '\u000F';
U_0010 : '\u0010';
U_0011 : '\u0011';
U_0012 : '\u0012';
U_0013 : '\u0013';
U_0014 : '\u0014';
U_0015 : '\u0015';
U_0016 : '\u0016';
U_0017 : '\u0017';
U_0018 : '\u0018';
U_0019 : '\u0019';
U_001A : '\u001A';
U_001B : '\u001B';
U_001C : '\u001C';
U_001D : '\u001D';
U_001E : '\u001E';
U_001F : '\u001F';
U_007F : '\u007F';
U_0080 : '\u0080';
U_0081 : '\u0081';
U_0082 : '\u0082';
U_0083 : '\u0083';
U_0084 : '\u0084';
U_0085 : '\u0085';
U_0086 : '\u0086';
U_0087 : '\u0087';
U_0088 : '\u0088';
U_0089 : '\u0089';
U_008A : '\u008A';
U_008B : '\u008B';
U_008C : '\u008C';
U_008D : '\u008D';
U_008E : '\u008E';
U_008F : '\u008F';
U_0090 : '\u0090';
U_0091 : '\u0091';
U_0092 : '\u0092';
U_0093 : '\u0093';
U_0094 : '\u0094';
U_0095 : '\u0095';
U_0096 : '\u0096';
U_0097 : '\u0097';
U_0098 : '\u0098';
U_0099 : '\u0099';
U_009A : '\u009A';
U_009B : '\u009B';
U_009C : '\u009C';
U_009D : '\u009D';
U_009E : '\u009E';
U_009F : '\u009F';
U_00A0 : '\u00A0';
U_00A1 : '\u00A1';
U_00A2 : '\u00A2';
U_00A3 : '\u00A3';
U_00A4 : '\u00A4';
U_00A5 : '\u00A5';
U_00A6 : '\u00A6';
U_00A7 : '\u00A7';
U_00A8 : '\u00A8';
U_00A9 : '\u00A9';
U_00AA : '\u00AA';
U_00AB : '\u00AB';
U_00AC : '\u00AC';
U_00AD : '\u00AD';
U_00AE : '\u00AE';
U_00AF : '\u00AF';
U_00B0 : '\u00B0';
U_00B1 : '\u00B1';
U_00B2 : '\u00B2';
U_00B3 : '\u00B3';
U_00B4 : '\u00B4';
U_00B5 : '\u00B5';
U_00B6 : '\u00B6';
U_00B7 : '\u00B7';
U_00B8 : '\u00B8';
U_00B9 : '\u00B9';
U_00BA : '\u00BA';
U_00BB : '\u00BB';
U_00BC : '\u00BC';
U_00BD : '\u00BD';
U_00BE : '\u00BE';
U_00BF : '\u00BF';
U_00C0 : '\u00C0';
U_00C1 : '\u00C1';
U_00C2 : '\u00C2';
U_00C3 : '\u00C3';
U_00C4 : '\u00C4';
U_00C5 : '\u00C5';
U_00C6 : '\u00C6';
U_00C7 : '\u00C7';
U_00C8 : '\u00C8';
U_00C9 : '\u00C9';
U_00CA : '\u00CA';
U_00CB : '\u00CB';
U_00CC : '\u00CC';
U_00CD : '\u00CD';
U_00CE : '\u00CE';
U_00CF : '\u00CF';
U_00D0 : '\u00D0';
U_00D1 : '\u00D1';
U_00D2 : '\u00D2';
U_00D3 : '\u00D3';
U_00D4 : '\u00D4';
U_00D5 : '\u00D5';
U_00D6 : '\u00D6';
U_00D7 : '\u00D7';
U_00D8 : '\u00D8';
U_00D9 : '\u00D9';
U_00DA : '\u00DA';
U_00DB : '\u00DB';
U_00DC : '\u00DC';
U_00DD : '\u00DD';
U_00DE : '\u00DE';
U_00DF : '\u00DF';
U_00E0 : '\u00E0';
U_00E1 : '\u00E1';
U_00E2 : '\u00E2';
U_00E3 : '\u00E3';
U_00E4 : '\u00E4';
U_00E5 : '\u00E5';
U_00E6 : '\u00E6';
U_00E7 : '\u00E7';
U_00E8 : '\u00E8';
U_00E9 : '\u00E9';
U_00EA : '\u00EA';
U_00EB : '\u00EB';
U_00EC : '\u00EC';
U_00ED : '\u00ED';
U_00EE : '\u00EE';
U_00EF : '\u00EF';
U_00F0 : '\u00F0';
U_00F1 : '\u00F1';
U_00F2 : '\u00F2';
U_00F3 : '\u00F3';
U_00F4 : '\u00F4';
U_00F5 : '\u00F5';
U_00F6 : '\u00F6';
U_00F7 : '\u00F7';
U_00F8 : '\u00F8';
U_00F9 : '\u00F9';
U_00FA : '\u00FA';
U_00FB : '\u00FB';
U_00FC : '\u00FC';
U_00FD : '\u00FD';
U_00FE : '\u00FE';
U_00FF : '\u00FF';
U_FEFF : '\uFEFF';
WS: [\n\r]+ -> skip;