AST-Minijava/MiniJavaGrammar.g4 at master · WalbeRodri/AST-Minijava · GitHub

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grammar MiniJavaGrammar;

goal : 	mainClass ( classDeclaration )* EOF;

mainClass : 'class' IDENTIFIER '{' 'public' 'static' 'void' 'main'
	 '(' 'String' '[' ']' IDENTIFIER ')'
	 	 '{' statement '}' '}';

classDeclaration : 'class' IDENTIFIER  ('extends' IDENTIFIER)?
 	'{' (varDeclaration)* ( methodDeclaration )* '}';

varDeclaration : type IDENTIFIER ';' ;

methodDeclaration : 'public' type IDENTIFIER '(' (type IDENTIFIER (',' type IDENTIFIER)*)? ')'
	'{'(varDeclaration)* (statement)* 'return' expression ';' '}' ;

type : 'int' '['']' | 'boolean' | 'int' | IDENTIFIER  ;

statement : '{'(statement)*'}' |
 	'if' '('expression')' statement 'else' statement |
 	'while''('expression')'statement |
 	'System.out.println' '('expression')'';' |
 	IDENTIFIER '=' expression';' |
 	IDENTIFIER '['expression']' '=' expression ';';

expression : expression OP expression |
	expression '['expression']'|
	expression '.' 'length'|
	expression '.' IDENTIFIER '('(expression (','expression)*)?')'|
	'true' |
	'false' |
	IDENTIFIER |
	'this' |
	'new' 'int' '[' expression ']' |
	'new' IDENTIFIER '('')' |
	'!'expression |
	'(' expression ')'|
	INTEGER;

INTEGER :  ('-')?[0-9]+;

IDENTIFIER : ([a-zA-Z] | '_' | [0-9])+;

OP : ('&&'|'<'|'+'|'-'|'*');

SPACE : [ \r\n\t]+ -> skip;