A new keyword match needs to be added, as well as syntax for pattern matching.
The syntax is as follows:
match_stmt = "match" expr "{" (patterns ("if" expr)? "{" stmt* "}")* "}";
match_expr = "match" expr "{" (patterns ("if" expr)? "=>" expr)* "}";
patterns = pattern ("|" pattern)*;
pattern = range | table_pat | list_pat | literal_pat | binding_pat;
range = int ":" int;
table_pat = "{" (literal_pat ":" pattern),* ("," "...")? "}";
list_pat = "[" pattern,* ("," "...")? "]";
literal_pat = str | int | float | bool | undef | table | list | fn;
binding_pat = ("const" | "let") id ("=" pattern)? | "_";
precedence needs to be cleared up slightly here, but this should be a solid base for patterns.