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lexer grammar RustLexer;
tokens {
EQ, LT, LE, EQEQ, NE, GE, GT, ANDAND, OROR, NOT, TILDE, PLUT,
MINUS, STAR, SLASH, PERCENT, CARET, AND, OR, SHL, SHR, BINOP,
BINOPEQ, AT, DOT, DOTDOT, DOTDOTDOT, COMMA, SEMI, COLON,
MOD_SEP, RARROW, FAT_ARROW, LPAREN, RPAREN, LBRACKET, RBRACKET,
LBRACE, RBRACE, POUND, DOLLAR, UNDERSCORE, LIT_CHAR,
LIT_INTEGER, LIT_FLOAT, LIT_STR, LIT_STR_RAW, LIT_BINARY,
LIT_BINARY_RAW, IDENT, LIFETIME, WHITESPACE, DOC_COMMENT,
COMMENT
}
/* Note: due to antlr limitations, we can't represent XID_start and
* XID_continue properly. ASCII-only substitute. */
fragment XID_start : [_a-zA-Z] ;
fragment XID_continue : [_a-zA-Z0-9] ;
/* Expression-operator symbols */
EQ : '=' ;
LT : '<' ;
LE : '<=' ;
EQEQ : '==' ;
NE : '!=' ;
GE : '>=' ;
GT : '>' ;
ANDAND : '&&' ;
OROR : '||' ;
NOT : '!' ;
TILDE : '~' ;
PLUS : '+' ;
MINUS : '-' ;
STAR : '*' ;
SLASH : '/' ;
PERCENT : '%' ;
CARET : '^' ;
AND : '&' ;
OR : '|' ;
SHL : '<<' ;
SHR : '>>' ;
BINOP
: PLUS
| SLASH
| MINUS
| STAR
| PERCENT
| CARET
| AND
| OR
| SHL
| SHR
;
BINOPEQ : BINOP EQ ;
/* "Structural symbols" */
AT : '@' ;
DOT : '.' ;
DOTDOT : '..' ;
DOTDOTDOT : '...' ;
COMMA : ',' ;
SEMI : ';' ;
COLON : ':' ;
MOD_SEP : '::' ;
RARROW : '->' ;
FAT_ARROW : '=>' ;
LPAREN : '(' ;
RPAREN : ')' ;
LBRACKET : '[' ;
RBRACKET : ']' ;
LBRACE : '{' ;
RBRACE : '}' ;
POUND : '#';
DOLLAR : '$' ;
UNDERSCORE : '_' ;
// Literals
fragment HEXIT
: [0-9a-fA-F]
;
fragment CHAR_ESCAPE
: [nrt\\'"0]
| [xX] HEXIT HEXIT
| 'u' HEXIT HEXIT HEXIT HEXIT
| 'U' HEXIT HEXIT HEXIT HEXIT HEXIT HEXIT HEXIT HEXIT
;
fragment SUFFIX
: IDENT
;
LIT_CHAR
: '\'' ( '\\' CHAR_ESCAPE | ~[\\'\n\t\r] ) '\'' SUFFIX?
;
LIT_BYTE
: 'b\'' ( '\\' ( [xX] HEXIT HEXIT | [nrt\\'"0] ) | ~[\\'\n\t\r] ) '\'' SUFFIX?
;
LIT_INTEGER
: [0-9][0-9_]* SUFFIX?
| '0b' [01][01_]* SUFFIX?
| '0o' [0-7][0-7_]* SUFFIX?
| '0x' [0-9a-fA-F][0-9a-fA-F_]* SUFFIX?
;
LIT_FLOAT
: [0-9][0-9_]* ('.' {
/* dot followed by another dot is a range, no float */
_input.LA(1) != '.' &&
/* dot followed by an identifier is an integer with a function call, no float */
_input.LA(1) != '_' &&
_input.LA(1) != 'a' &&
_input.LA(1) != 'b' &&
_input.LA(1) != 'c' &&
_input.LA(1) != 'd' &&
_input.LA(1) != 'e' &&
_input.LA(1) != 'f' &&
_input.LA(1) != 'g' &&
_input.LA(1) != 'h' &&
_input.LA(1) != 'i' &&
_input.LA(1) != 'j' &&
_input.LA(1) != 'k' &&
_input.LA(1) != 'l' &&
_input.LA(1) != 'm' &&
_input.LA(1) != 'n' &&
_input.LA(1) != 'o' &&
_input.LA(1) != 'p' &&
_input.LA(1) != 'q' &&
_input.LA(1) != 'r' &&
_input.LA(1) != 's' &&
_input.LA(1) != 't' &&
_input.LA(1) != 'u' &&
_input.LA(1) != 'v' &&
_input.LA(1) != 'w' &&
_input.LA(1) != 'x' &&
_input.LA(1) != 'y' &&
_input.LA(1) != 'z' &&
_input.LA(1) != 'A' &&
_input.LA(1) != 'B' &&
_input.LA(1) != 'C' &&
_input.LA(1) != 'D' &&
_input.LA(1) != 'E' &&
_input.LA(1) != 'F' &&
_input.LA(1) != 'G' &&
_input.LA(1) != 'H' &&
_input.LA(1) != 'I' &&
_input.LA(1) != 'J' &&
_input.LA(1) != 'K' &&
_input.LA(1) != 'L' &&
_input.LA(1) != 'M' &&
_input.LA(1) != 'N' &&
_input.LA(1) != 'O' &&
_input.LA(1) != 'P' &&
_input.LA(1) != 'Q' &&
_input.LA(1) != 'R' &&
_input.LA(1) != 'S' &&
_input.LA(1) != 'T' &&
_input.LA(1) != 'U' &&
_input.LA(1) != 'V' &&
_input.LA(1) != 'W' &&
_input.LA(1) != 'X' &&
_input.LA(1) != 'Y' &&
_input.LA(1) != 'Z'
}? | ('.' [0-9][0-9_]*)? ([eE] [-+]? [0-9][0-9_]*)? SUFFIX?)
;
LIT_STR
: '"' ('\\\n' | '\\\r\n' | '\\' CHAR_ESCAPE | .)*? '"' SUFFIX?
;
LIT_BINARY : 'b' LIT_STR SUFFIX?;
LIT_BINARY_RAW : 'rb' LIT_STR_RAW SUFFIX?;
/* this is a bit messy */
fragment LIT_STR_RAW_INNER
: '"' .*? '"'
| LIT_STR_RAW_INNER2
;
fragment LIT_STR_RAW_INNER2
: POUND LIT_STR_RAW_INNER POUND
;
LIT_STR_RAW
: 'r' LIT_STR_RAW_INNER SUFFIX?
;
QUESTION : '?';
IDENT : XID_start XID_continue* ;
fragment QUESTION_IDENTIFIER : QUESTION? IDENT;
LIFETIME : '\'' IDENT ;
WHITESPACE : [ \r\n\t]+ ;
UNDOC_COMMENT : '////' ~[\r\n]* -> type(COMMENT) ;
YESDOC_COMMENT : '///' ~[\r\n]* -> type(DOC_COMMENT) ;
OUTER_DOC_COMMENT : '//!' ~[\r\n]* -> type(DOC_COMMENT) ;
LINE_COMMENT : '//' ~[\r\n]* -> type(COMMENT) ;
DOC_BLOCK_COMMENT
: ('/**' ~[*] | '/*!') (DOC_BLOCK_COMMENT | .)*? '*/' -> type(DOC_COMMENT)
;
BLOCK_COMMENT : '/*' (BLOCK_COMMENT | .)*? '*/' -> type(COMMENT) ;
|
