This library is a Lexical Analysis for a minified java syntax. You can find more info about the target syntax in this Document
This tool uses a DFA (Deterministic Finite Automata) as a backend to efficiently tokenize the Code text.
BNF de MiniJAVA
Program ::= 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 ( "&&" | "<" | "+" | "-" | "*" ) Expression
| Expression "[" Expression "]"
| Expression "." "length"
| Expression "." Identifier "(" ( Expression ( "," Expression )* )? ")"
| <INTEGER_LITERAL>
| <BOOLEAN_LITERAL>
| Identifier
| "this"
| "new" "int" "[" Expression "]"
| "new" Identifier "(" ")"
| "!" Expression
| "(" Expression ")"
Identifier ::= <IDENTIFIER>Running this program on example.java yields:
> go run *.go
---------- START ----------
class IDENTIFIER{
public static void main(String[] IDENTIFIER){
System.out.println(new IDENTIFIER().IDENTIFIER(INTEGER_LITERAL));
}
}
class IDENTIFIER {
int IDENTIFIER;
public void IDENTIFIER(){
System.out.println(IDENTIFIER);
}
}
class IDENTIFIER extends IDENTIFIER {
public int IDENTIFIER(int IDENTIFIER){
int IDENTIFIER ;
SINGLE_LINE_COMMENT
for(int IDENTIFIER=INTEGER_LITERAL; IDENTIFIER<=IDENTIFIER; IDENTIFIER++){
IDENTIFIER = IDENTIFIER;
System.out.println(IDENTIFIER);
}
if (IDENTIFIER <= INTEGER_LITERAL)
IDENTIFIER = INTEGER_LITERAL ;
MULTI_LINE_COMMENT
else
IDENTIFIER = IDENTIFIER * (this.IDENTIFIER(IDENTIFIER - INTEGER_LITERAL)) ;
return IDENTIFIER ;
}
}
---------- END ----------