Scanner working for single character tokens.

golox/internal/runner/token.go

@@ -0,0 +1,33 @@
+package runner
+
+import "fmt"
+
+type Token struct {
+	Type    TokenType
+	Lexme   string
+	Literal interface{}
+	Line    int
+}
+
+func NewToken(
+	typ TokenType,
+	lexme string,
+	lit interface{},
+	line int,
+) Token {
+	return Token{
+		Type:    typ,
+		Lexme:   lexme,
+		Literal: lit,
+		Line:    line,
+	}
+}
+
+func (t Token) String() string {
+	return fmt.Sprintf(
+		"%s %s %v",
+		t.Type,
+		t.Lexme,
+		t.Literal,
+	)
+}