UnaryExpr and fix type check for BynaryExpr

lexer.v

@@ -26,6 +26,12 @@ enum TokenType as u8 {
 	greater_eq
 	less_eq
 	not_eq
+	plus_eq
+	minus_eq
+	star_eq
+	slash_eq
+	increment
+	decrement
 	lparen
 	rparen
 	lsqparen
@@ -46,43 +52,7 @@ struct Token {
 }
 
 fn str_from_toktype(type TokenType) string {
-	return match type {
-		.integer {'integer'}
-		.real {'real'}
-		.boolean {'boolean'}
-		.kw_let {'let'}
-		.type {'type'}
-		.kw_if {'if'}
-		.kw_else {'else'}
-		.kw_for {'for'}
-		.kw_break {'break'}
-		.kw_fn {'fn'}
-		.kw_return {'return'}
-		.identifier {'identifier'}
-		.eof {'EOF'}
-		.unknown {'unknown'}
-		.plus {'plus'}
-		.minus {'minus'}
-		.star {'star'}
-		.slash {'slash'}
-		.equals {'equals'}
-		.less {'less'}
-		.greater {'greater'}
-		.lparen {'lparen'}
-		.rparen {'rparen'}
-		.lsqparen {'lsqparen'}
-		.rsqparen {'rsqparen'}
-		.lbracket {'lbracket'}
-		.rbracket {'rbracket'}
-		.dot {'dot'}
-		.comma {'comma'}
-		.semicolon {'semicolon'}
-		.colon {'colon'}
-		.eq_eq {'eq eq'}
-		.greater_eq {'greater eq'}
-		.less_eq {'less eq'}
-		.not_eq {'not eq'}
-	}
+	return type.str()
 }
 
 fn toktype_from_delimiter(delimiter string) TokenType {
@@ -108,6 +78,12 @@ fn toktype_from_delimiter(delimiter string) TokenType {
     '>=' {.greater_eq}
     '<=' {.less_eq}
     '!=' {.not_eq}
+		'+=' {.plus_eq}
+		'-=' {.minus_eq}
+		'*=' {.star_eq}
+		'/=' {.slash_eq}
+		'++' {.increment}
+		'--' {.decrement}
 		else {.unknown}
 	}
 }
@@ -175,7 +151,7 @@ fn lex(input string) ?[]Token {
 				mut tok_str := input[right].ascii_str()
 					if right + 1 < input.len {
 						combined := input.substr(right, right + 2)
-						if combined in ['==', '>=', '<=', '!='] {
+						if combined in ['==', '>=', '<=', '!=', '+=', '-=', '*=', '/=', '++', '--'] {
 							tok_str = combined
 								right++
 						}