Introduction to Compiler Construction in a Java World

304 An Introduction to Compiler Construction in a Java World

int, char and String Literals

An escape (ESC) character in j-- is a \ followed by n, r, t, b, f, ’, ", or \. In addition to

the true, false, and null literals, j-- supports int, char, and String literals as described

by the following regular expressions:

< i n t_literal > = 0|(1 -9){0 -9}

< char_literal > = ’( ESC |~( ’|\| LF| CR )) ’

< string_literal > = "{ ESC | ~ ( " | \ | LF | CR )}"

B.6.2 Syntactic Grammar

compilationUnit ::= [package qualifiedIdentifier ;]

{import qualifiedIdentifier ;}

{typeDeclaration} EOF

qualifiedIdentifier ::= <identifier> {. <identifier>}

typeDeclaration ::= modifiers classDeclaration ...