BNF for JavaParser

/*
 * Modifiers. We match all modifiers in a single rule to reduce the chances of
 * syntax errors for simple modifier mistakes. It will also enable us to give
 * better error messages.
 */

/*
 * Declaration syntax follows.
 */

// void ClassDeclaration() #void :

/*
 * Type, name and expression syntax follows.
 */

/*
 * Expression syntax follows.
 */

/*
 * This expansion has been written this way instead of:
 *   Assignment() | TernaryExpression()
 * for performance reasons.
 * However, it is a weakening of the grammar for it allows the LHS of
 * assignments to be any conditional expression whereas it can only be
 * a primary expression.  Consider adding a semantic predicate to work
 * around this.
 */

// This production is to determine lookahead only.  The LOOKAHEAD specifications
// below are not used, but they are there just to indicate that we know about
// this.

/*
 * The third LOOKAHEAD specification below is to parse to PrimarySuffix
 * if there is an expression between the "[...]".
 */

/*
 * Statement syntax follows.
 */

/* Annotation syntax follows. */

/* Annotation Types. */

<DEFAULT> SPECIAL_TOKEN : { 
<WHITESPACE: (" " | "\t" | "\n" | "\r" | "\f")+>
}

<DEFAULT> MORE : { 
"//"
|<"/**" ~["/"]>
|"/*"
}

<IN_SINGLE_LINE_COMMENT> SPECIAL_TOKEN : { 
<SINGLE_LINE_COMMENT: "\n" | "\r" | "\r\n">
}

<IN_FORMAL_COMMENT> SPECIAL_TOKEN : { 
<FORMAL_COMMENT: "*/">
}

<IN_MULTI_LINE_COMMENT> SPECIAL_TOKEN : { 
<MULTI_LINE_COMMENT: "*/">
}

<IN_SINGLE_LINE_COMMENT, IN_FORMAL_COMMENT, IN_MULTI_LINE_COMMENT> MORE : { 
<~[]>
}

<DEFAULT> TOKEN : { 
<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">
|<FALSE: "false">
|<FINAL: "final">
|<FINALLY: "finally">
|<FLOAT: "float">
|<FOR: "for">
|<GOTO: "goto">
|<IF: "if">
|<IMPLEMENTS: "implements">
|<IMPORT: "import">
|<INSTANCEOF: "instanceof">
|<INT: "int">
|<INTERFACE: "interface">
|<LONG: "long">
|<NATIVE: "native">
|<NEW: "new">
|<NULL: "null">
|<PACKAGE: "package">
|<PRIVATE: "private">
|<PROTECTED: "protected">
|<PUBLIC: "public">
|<RETURN: "return">
|<SHORT: "short">
|<STATIC: "static">
|<STRICTFP: "strictfp">
|<SUPER: "super">
|<SWITCH: "switch">
|<SYNCHRONIZED: "synchronized">
|<THIS: "this">
|<THROW: "throw">
|<THROWS: "throws">
|<TRANSIENT: "transient">
|<TRUE: "true">
|<TRY: "try">
|<VOID: "void">
|<VOLATILE: "volatile">
|<WHILE: "while">
}

<DEFAULT> TOKEN : { 
<INTEGER_LITERAL: <DECIMAL_LITERAL> (["l","L"])? | <HEX_LITERAL> (["l","L"])? | <OCTAL_LITERAL> (["l","L"])?>
|<FLOATING_POINT_LITERAL: <DECIMAL_FLOATING_POINT_LITERAL> | <HEXADECIMAL_FLOATING_POINT_LITERAL>>
|<CHARACTER_LITERAL: "\'" (~["\'","\\","\n","\r"] | "\\" (["n","t","b","r","f","\\","\'","\""] | ["0"-"7"] (["0"-"7"])? | ["0"-"3"] ["0"-"7"] ["0"-"7"])) "\'">
|<STRING_LITERAL: "\"" (~["\"","\\","\n","\r"] | "\\" (["n","t","b","r","f","\\","\'","\""] | ["0"-"7"] (["0"-"7"])? | ["0"-"3"] ["0"-"7"] ["0"-"7"]))* "\"">
}

<DEFAULT> TOKEN : { 
<LPAREN: "(">
|<RPAREN: ")">
|<LBRACE: "{">
|<RBRACE: "}">
|<LBRACKET: "[">
|<RBRACKET: "]">
|<SEMICOLON: ";">
|<COMMA: ",">
|<DOT: ".">
}

<DEFAULT> TOKEN : { 
<ASSIGN: "=">
|<GT: ">">
|<LT: "<">
|<BANG: "!">
|<TILDE: "~">
|<HOOK: "?">
|<COLON: ":">
|<EQ: "==">
|<LE: "<=">
|<GE: ">=">
|<NE: "!=">
|<SC_OR: "||">
|<SC_AND: "&&">
|<INCR: "++">
|<DECR: "--">
|<PLUS: "+">
|<MINUS: "-">
|<STAR: "*">
|<SLASH: "/">
|<BIT_AND: "&">
|<BIT_OR: "|">
|<XOR: "^">
|<REM: "%">
|<LSHIFT: "<<">
|<RSIGNEDSHIFT: ">>">
|<RUNSIGNEDSHIFT: ">>>">
|<PLUSASSIGN: "+=">
|<MINUSASSIGN: "-=">
|<STARASSIGN: "*=">
|<SLASHASSIGN: "/=">
|<ANDASSIGN: "&=">
|<ORASSIGN: "|=">
|<XORASSIGN: "^=">
|<REMASSIGN: "%=">
|<LSHIFTASSIGN: "<<=">
|<RSIGNEDSHIFTASSIGN: ">>=">
|<RUNSIGNEDSHIFTASSIGN: ">>>=">
}

<DEFAULT> TOKEN : { 
<IDENTIFIER: <LETTER> (<PART_LETTER>)*>
|}