token:		keyword | identifier | constant | string-litteral | punctuator

keyword:	"auto" | "break" | "case" | "char" | "const" | "continue"
		| "default" | "do" | "double" | "else" | "enum" | "extern"
		| "float" | "for" | "goto" | "if" | "inline" | "int" | "long"
		| "register" | "restrict" | "return" | "short" | "signed"
		| "sizeof" | "static" | "struct" | "switch" | "typedef"
		| "union" | "unsigned" | "void" | "volatile" | "while"
		| "_Bool" | "_Complex" | "_Imaginary"

punctuator:	"[" | "]" | "(" | ")" | "{" | "}" | "." | "->" | "++" | "--"
		| "&" | "*" | "+" | "-" | "~" | "!" | "/" | "%" | "<<" | ">>"
		| "<" | ">" | "<=" | ">=" | "==" | "!=" | "^" | "|" | "&&"
		| "||" | "?" | ":" | ";" | "..." | "=" | "*=" | "/=" | "%="
		| "+=" | "-=" | "<<=" | ">>=" | "&=" | "^=" | "|=" | "," | "#"
		| "##" | "<:" | ":>" | "<%" | "%>" | "%:" | "%:%:"

type-specifier:		"void" | "char" | "short" | "int" | "long" | "float"
			| "double" | "signed" | "unsigned" | "_Bool"
			| "_Complex" | "_Imaginary" | struct-or-union-specifier
			| enum-specifier | typedef-name

function-specifier:	"inline"

function-specifier:	"inline"

type-qualifier:	"const" | "restrict" | "volatile"

pointer:	"*" type-qualifier-list-opt { "*" type-qualifier-list-opt }

parameter-list:		parameter-declaration { "," parameter-declaration }

parameter-declaration:	declaration-specifiers ( declarator
		| abstract-declarator-opt )

identifier-list:	identifier { "," identifier }

compound-statement:	{ block-item-list-opt }

block-item-list:	block-item { block-item }

block-item:	declaration | statement

function-definition:	declaration-specifiers declarator declaration-list-opt
		compound-statement

declaration-list:	declaration { declaration }

digit:		"0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"

lparen:		"("
		(rule 1)

new-line:	"\n"

==

rule 1:		- there must not be preceding white spaces