boolean-type from comparisons

lexer.v

@@ -22,6 +22,10 @@ enum TokenType as u8 {
 	equals
 	less
 	greater
+	eq_eq
+	greater_eq
+	less_eq
+	not_eq
 	lparen
 	rparen
 	lsqparen
@@ -52,7 +56,7 @@ fn str_from_toktype(type TokenType) string {
 		.kw_else {'else'}
 		.kw_for {'for'}
 		.kw_break {'break'}
-		.kw_fn {'break'}
+		.kw_fn {'fn'}
 		.kw_return {'return'}
 		.identifier {'identifier'}
 		.eof {'EOF'}
@@ -74,6 +78,10 @@ fn str_from_toktype(type TokenType) string {
 		.comma {'comma'}
 		.semicolon {'semicolon'}
 		.colon {'colon'}
+		.eq_eq {'eq eq'}
+		.greater_eq {'greater eq'}
+		.less_eq {'less eq'}
+		.not_eq {'not eq'}
 	}
 }
 
@@ -96,6 +104,10 @@ fn toktype_from_delimiter(delimiter string) TokenType {
 		',' {.comma}
 		';' {.semicolon}
 		':' {.colon}
+		'==' {.eq_eq}
+    '>=' {.greater_eq}
+    '<=' {.less_eq}
+    '!=' {.not_eq}
 		else {.unknown}
 	}
 }
@@ -160,7 +172,15 @@ fn lex(input string) ?[]Token {
 		}
 		if is_delimiter(input[right], is_inside_number) && left == right {
 			if !input[right].is_space() {
-				tokens << Token{toktype_from_delimiter(input[right].ascii_str()), input[right].ascii_str()}
+				mut tok_str := input[right].ascii_str()
+					if right + 1 < input.len {
+						combined := input.substr(right, right + 2)
+						if combined in ['==', '>=', '<=', '!='] {
+							tok_str = combined
+								right++
+						}
+					}
+				tokens << Token{toktype_from_delimiter(tok_str), tok_str}
 			}
 			right++
 			left = right