<DECIMAL_INTEGER>: 0 | [1-9] [0-9]*    ;
<HEX_INTEGER>: 0[xX][0-9a-fA-F]+        ;
<OCTAL_INTEGER>: 0[0-7]+        ;

<EXPONENT>: [eE] [\-\+]? [0-9]+         ;
<FLOAT_TYPE>: [fFdD]    ;

<ESCAPE_SEQUENCE>: \\ ([btnfr\"\'\\] | ([0-3] [0-7]{0,2} | [4-7][0-7]?))       ;

<INTEGER_LITERAL>: (<DECIMAL_INTEGER> | <HEX_INTEGER> | <OCTAL_INTEGER>) [lL]?  ;
<FLOATING_POINT_LITERAL>: [0-9]+ \. [0-9]* <EXPONENT>? <FLOAT_TYPE>? | \. [0-9]+ <EXPONENT>? <FLOAT_TYPE>? | [0-9]+ <EXPONENT> <FLOAT_TYPE>? | [0-9]+ <FLOAT_TYPE>      ;
<BOOLEAN_LITERAL>: true | false ;
<CHARACTER_LITERAL>: \' ([^\\\'] | <ESCAPE_SEQUENCE> ) \'       ;
<STRING_LITERAL>: \" ([^\\\"] | <ESCAPE_SEQUENCE> )* \"      ;
<NULL_LITERAL>: null    ;

<IDENTIFIER>: [a-zA-Z_] \w*     ;

<GT>: \> ;
<LT>: \< ;


<eol>: \r | \n | \r\n   ;
<whitespace>: \s+       ;
<JAVADOC>: \/\*\*;
<comment>: \/\/ [^\r\n]* <eol>  ;
<comment2>: \/\* ;