1 files changed, 61 insertions, 0 deletions
diff --git a/token.go b/token.go
new file mode 100644
index 0000000..17ff6bd
--- /dev/null
+++ b/token.go
@@ -0,0 +1,61 @@
+package expression
+
+import (
+	"fmt"
+	"go/token"
+	"strconv"
+)
+
+type Token struct {
+	Token   token.Token
+	Literal string
+	Pos     int
+}
+
+func (t *Token) Int() (int, bool) {
+	if t.Token != token.INT {
+		return 0, false
+	}
+	i, _ := strconv.Atoi(t.Literal)
+	return i, true
+}
+
+func (t *Token) Float() float64 {
+	i, _ := strconv.ParseFloat(t.Literal, 64)
+	return i
+}
+
+func (t *Token) IsNumber() bool {
+	return t.Token == token.INT || t.Token == token.FLOAT
+}
+
+func (t *Token) LP() bool {
+	return t.Token == token.LPAREN
+}
+
+func (t *Token) RP() bool {
+	return t.Token == token.RPAREN
+}
+
+func (t *Token) IsFunc() bool {
+	return t.Token == token.IDENT
+}
+
+func (t *Token) IsSeparator() bool {
+	return t.Token == token.COMMA
+}
+
+func (t *Token) IsOperator() bool {
+	return t.Token.IsOperator() && !t.LP() && !t.RP()
+}
+
+func (t *Token) IsError() bool {
+	return t.Token != token.ILLEGAL
+}
+
+func (t *Token) Error() error {
+	if t.Token != token.ILLEGAL {
+		return nil
+	}
+	return fmt.Errorf(t.Literal)
+}