diff --git a/lexer.v b/lexer.v
index 3757296..0f9d203 100644
--- a/lexer.v
+++ b/lexer.v
@@ -1,11 +1,30 @@
 module main
 
+import term
+
 enum TokenType as u8 {
 	integer
 	real
-	operator
 	keyword
 	identifier
+	plus
+	minus
+	star
+	slash
+	equals
+	less
+	greater
+	lparen
+	rparen
+	lsqparen
+	rsqparen
+	lbracket
+	rbracket
+	dot
+	comma
+	semicolon
+	colon
+	newline
 	eof
 	unknown
 }
@@ -15,47 +34,95 @@ struct Token {
 	text string
 }
 
+
 fn str_from_toktype(type TokenType) string {
 	return match type {
 		.integer {'integer'}
 		.real {'real'}
-		.operator {'operator'}
 		.keyword {'keyword'}
 		.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'}
+		.newline {'newline'}
+	}
+}
+
+fn toktype_from_delimiter(delimiter string) TokenType {
+	return match delimiter {
+		'(' {.lparen}
+		')' {.rparen}
+		'[' {.lsqparen}
+		']' {.rsqparen}
+		'{' {.lbracket}
+		'}' {.rbracket}
+		'+' {.plus}
+		'-' {.minus}
+		'*' {.star}
+		'/' {.slash}
+		'=' {.equals}
+		'<' {.less}
+		'>' {.greater}
+		'.' {.dot}
+		',' {.comma}
+		';' {.semicolon}
+		':' {.colon}
+		'\n' {.newline}
+		else {.unknown}
 	}
 }
 
 fn is_delimiter(c u8) bool {
-	return " +-*/,;%<>()[]{}=\n".contains(c.ascii_str())
-}
-
-fn is_operator(c u8) bool {
-	return "+-*/=".contains(c.ascii_str())
+	return " +-*/.,;:%<>()[]{}=\n".contains(c.ascii_str())
 }
 
 fn is_real(str string) bool {
-
 	left, right := str.split_once(".") or {return false}
 	return !right.contains(".") && left.is_int() && right.is_int()
 }
 
 fn is_keyword(str string) bool {
 	return [
-		"void", "int", "real", "if", "else", "while", "break", "fn", "return"
+		"void", "int", "real", "bool", "if", "else", "for", "break", "fn", "return"
 	].contains(str)
 }
 
 fn print_tok(tok Token) {
-	println("${tok.text:8} (${str_from_toktype(tok.type)})")
+	println("${tok.text.replace("\n", "\\n"):8} (${str_from_toktype(tok.type)})")
 }
 
-fn lex(input string) {
+fn print_toks(toks []Token) {
+	for tok in toks {
+		print_tok(tok)
+	}
+}
+
+fn lex(input string) ?[]Token {
 	mut left := 0
 	mut right := 0
+	mut line := 1
+	mut tokens := []Token{}
 
 	for (right < input.len && left <= right) {
+		if input[right] == `\n` {
+			line++
+		}
 		if !is_delimiter(input[right]) {
 			right++
 		}
@@ -63,8 +130,8 @@ fn lex(input string) {
 			break
 		}
 		if is_delimiter(input[right]) && left == right {
-			if is_operator(input[right]) {
-				print_tok(Token{TokenType.operator, input[right].ascii_str()})
+			if input[right] != ` ` {
+				tokens << Token{toktype_from_delimiter(input[right].ascii_str()), input[right].ascii_str()}
 			}
 			right++
 			left = right
@@ -72,18 +139,20 @@ fn lex(input string) {
 		else if (is_delimiter(input[right]) && left != right) || (right == input.len && left != right) {
 			subs := input.substr(left, right)
 			if is_keyword(subs) {
-				print_tok(Token{TokenType.keyword, subs})
+				tokens << Token{TokenType.keyword, subs}
 			} else if subs.is_int() {
-				print_tok(Token{TokenType.integer, subs})
+				tokens << Token{TokenType.integer, subs}
 			} else if is_real(subs) {
-				print_tok(Token{TokenType.real, subs})
+				tokens << Token{TokenType.real, subs}
 			} else if subs.is_identifier() {
-				print_tok(Token{TokenType.identifier, subs})
+				tokens << Token{TokenType.identifier, subs}
 			} else if !subs.is_identifier() && !is_delimiter(input[right-1])  {
-				print_tok(Token{TokenType.unknown, subs})
+				eprintln(term.red("ERROR: found invalid token " + subs + " at line " + line.str()))
+				return none
 			}
 			left = right
 		}
 	}
-	print_tok(Token{TokenType.eof, "EOF"})
+	tokens << Token{TokenType.eof, "EOF"}
+	return tokens
 }
diff --git a/main.v b/main.v
index 0b4cf19..e8bd6c9 100644
--- a/main.v
+++ b/main.v
@@ -1,7 +1,10 @@
 module main
 
+import os
+
 fn main() {
-	content := "real x = 6.50;"
-	println("for string : \"" + content + "\"")
-	lex(content)
+	content := os.read_file("test.one") or { return }
+	println("---------\n" + content + "---------")
+	tokens := lex(content) or { return }
+	print_toks(tokens)
 }
diff --git a/test.one b/test.one
new file mode 100644
index 0000000..0a36409
--- /dev/null
+++ b/test.one
@@ -0,0 +1,3 @@
+fn bool singledigit(int x) {
+  return x < 10;
+}
diff --git a/v.mod b/v.mod
index 1e8b39c..d22950c 100644
--- a/v.mod
+++ b/v.mod
@@ -1,6 +1,6 @@
 Module {
-	name: 'vlexer'
-	description: 'onelang lexer in v'
+	name: 'onev'
+	description: 'onelang compuler in v'
 	version: '0.0.0'
 	license: 'MIT'
 	dependencies: []