Yoyo

Yoyo is a statically-typed scripting language with C-like syntax. The language and interpreter are in active development, so I will add to this file details about the syntax and semantics of Yoyo when they are ready.

Since the parser is not yet complete, the Yoyo interpreter currently simply reads a line of input, tokenizes it, prints a string representation of the result, and repeats. On a lexical error, an error message is printed to stderr but execution continues.

Lexical Syntax

Below is a table listing the different types of tokens in Yoyo and their corresponding lexemes. Notice that else, if, int, print, and while are reserved words and are thus not valid IDs.

Token type	Lexeme (regex)
UINT	[0-9]+
ID	[A-Za-z_][0-9A-Za-z_]*
ELSE	else
IF	if
INT	int
PRINT	print
WHILE	while
PLUS	\+
MINUS	-
MULTIPLY	\*
DIVIDE	/
MOD	%
ASSIGN	=
COMPARE	==|<|>|<=|>=|!=
PAREN_L	\(
PAREN_R	\)
SEMICOLON	;