edu.illinois.cs.cs125.questioner.antlr.java.JavaLexer.g4 Maven / Gradle / Ivy
/*
[The "BSD licence"]
Copyright (c) 2013 Terence Parr, Sam Harwell
Copyright (c) 2017 Ivan Kochurkin (upgrade to Java 8)
All rights reserved.
Redistribution and use in entry and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of entry code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
lexer grammar JavaLexer;
// Keywords
ABSTRACT: 'abstract';
ASSERT: 'assert';
BOOLEAN: 'boolean';
BREAK: 'break';
BYTE: 'byte';
CASE: 'case';
CATCH: 'catch';
CHAR: 'char';
CLASS: 'class';
CONST: 'const';
CONTINUE: 'continue';
DEFAULT: 'default';
DO: 'do';
DOUBLE: 'double';
ELSE: 'else';
ENUM: 'enum';
EXTENDS: 'extends';
FINAL: 'final';
FINALLY: 'finally';
FLOAT: 'float';
FOR: 'for';
IF: 'if';
GOTO: 'goto';
IMPLEMENTS: 'implements';
IMPORT: 'import';
INSTANCEOF: 'instanceof';
INT: 'int';
INTERFACE: 'interface';
LONG: 'long';
NATIVE: 'native';
NEW: 'new';
PACKAGE: 'package';
PRIVATE: 'private';
PROTECTED: 'protected';
PUBLIC: 'public';
RECORD: 'record';
RETURN: 'return';
SHORT: 'short';
STATIC: 'static';
STRICTFP: 'strictfp';
SUPER: 'super';
SWITCH: 'switch';
SYNCHRONIZED: 'synchronized';
THIS: 'this';
THROW: 'throw';
THROWS: 'throws';
TRANSIENT: 'transient';
TRY: 'try';
VOID: 'void';
VOLATILE: 'volatile';
YIELD: 'yield';
WHILE: 'while';
// Literals
DECIMAL_LITERAL: ('0' | [1-9] (Digits? | '_'+ Digits)) [lL]?;
HEX_LITERAL: '0' [xX] [0-9a-fA-F] ([0-9a-fA-F_]* [0-9a-fA-F])? [lL]?;
OCT_LITERAL: '0' '_'* [0-7] ([0-7_]* [0-7])? [lL]?;
BINARY_LITERAL: '0' [bB] [01] ([01_]* [01])? [lL]?;
FLOAT_LITERAL: (Digits '.' Digits? | '.' Digits) ExponentPart? [fFdD]?
| Digits (ExponentPart [fFdD]? | [fFdD])
;
HEX_FLOAT_LITERAL: '0' [xX] (HexDigits '.'? | HexDigits? '.' HexDigits) [pP] [+-]? Digits [fFdD]?;
BOOL_LITERAL: 'true'
| 'false'
;
CHAR_LITERAL: '\'' (~['\\\r\n] | EscapeSequence) '\'';
STRING_LITERAL: '"' (~["\\\r\n] | EscapeSequence)* '"';
TEXT_BLOCK_LITERAL: '"""' .*? '"""';
NULL_LITERAL: 'null';
// Separators
LPAREN: '(';
RPAREN: ')';
LBRACE: '{';
RBRACE: '}';
LBRACK: '[';
RBRACK: ']';
SEMI: ';';
COMMA: ',';
DOT: '.';
// Operators
ASSIGN: '=';
GT: '>';
LT: '<';
BANG: '!';
TILDE: '~';
QUESTION: '?';
COLON: ':';
EQUAL: '==';
LE: '<=';
GE: '>=';
NOTEQUAL: '!=';
AND: '&&';
OR: '||';
INC: '++';
DEC: '--';
ADD: '+';
SUB: '-';
MUL: '*';
DIV: '/';
BITAND: '&';
BITOR: '|';
CARET: '^';
MOD: '%';
ADD_ASSIGN: '+=';
SUB_ASSIGN: '-=';
MUL_ASSIGN: '*=';
DIV_ASSIGN: '/=';
AND_ASSIGN: '&=';
OR_ASSIGN: '|=';
XOR_ASSIGN: '^=';
MOD_ASSIGN: '%=';
LSHIFT_ASSIGN: '<<=';
RSHIFT_ASSIGN: '>>=';
URSHIFT_ASSIGN: '>>>=';
// Java 8 tokens
ARROW: '->';
COLONCOLON: '::';
// Additional symbols not defined in the lexical specification
AT: '@';
ELLIPSIS: '...';
// Whitespace and comments
WS: [ \t\r\n\u000C]+ -> channel(HIDDEN);
COMMENT: '/*' .*? '*/';
LINE_COMMENT: '//' ~[\r\n]* -> channel(HIDDEN);
// Identifiers
IDENTIFIER: Letter LetterOrDigit*;
// Fragment rules
fragment ExponentPart
: [eE] [+-]? Digits
;
fragment EscapeSequence
: '\\' [btnfr"'\\]
| '\\' ([0-3]? [0-7])? [0-7]
| '\\' 'u'+ HexDigit HexDigit HexDigit HexDigit
;
fragment HexDigits
: HexDigit ((HexDigit | '_')* HexDigit)?
;
fragment HexDigit
: [0-9a-fA-F]
;
fragment Digits
: [0-9] ([0-9_]* [0-9])?
;
fragment LetterOrDigit
: Letter
| [0-9]
;
fragment Letter
: [a-zA-Z$_] // these are the "java letters" below 0x7F
| ~[\u0000-\u007F\uD800-\uDBFF] // covers all characters above 0x7F which are not a surrogate
| [\uD800-\uDBFF] [\uDC00-\uDFFF] // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
;