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.
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 |
|
| WHILE | while |
| PLUS | \+ |
| MINUS | - |
| MULTIPLY | \* |
| DIVIDE | / |
| MOD | % |
| ASSIGN | = |
| COMPARE | ==|<|>|<=|>=|!= |
| PAREN_L | \( |
| PAREN_R | \) |
| SEMICOLON | ; |