cnpj on the way

cnpj/lib.go

@@ -0,0 +1,65 @@
+package cnpj
+
+import (
+	"strconv"
+	"unicode"
+)
+
+//Gets a string and formats is as CPF
+func Format(s string) string {
+	raw := Strip(s)
+	ret := raw[0:2] + "." + raw[2:5] + "." + raw[5:8] + "/" + raw[8:12] + "-" + raw[12:14]
+	return ret
+
+}
+
+//Removes all non-digit symbols
+func Strip(s string) string {
+	ret := ""
+	for _, v := range s {
+		if unicode.IsDigit(v) {
+			ret = ret + string(v)
+		}
+	}
+	return ret
+}
+
+//Checks if verification digit are respected
+func Check(s string) bool {
+	raw := Strip(s)
+	nums := make([]int, 0)
+	for _, v := range raw {
+		i, _ := strconv.Atoi(string(v))
+		nums = append(nums, i)
+	}
+
+	d1 := 0
+	mul := 5
+	for _, v := range nums[0 : len(nums)-2] {
+		d1 = d1 + (v * mul)
+		mul--
+		if mul == 2 {
+			mul = 9
+		}
+	}
+	mod1 := 11 - ((d1) % 11)
+	if mod1 > 10 {
+		mod1 = 0
+	}
+
+	d2 := 0
+	mul = 6
+	for _, v := range nums[0 : len(nums)-2] {
+		d2 = d2 + (v * mul)
+		mul--
+		if mul == 2 {
+			mul = 9
+		}
+	}
+	d2 = d2 + (mod1 * mul)
+	mod2 := 11 - ((d2) % 11)
+	if mod2 > 10 {
+		mod2 = 0
+	}
+	return mod1 == nums[len(nums)-2] && mod2 == nums[len(nums)-1]
+}

cnpj/lib_test.go

@@ -0,0 +1,20 @@
+package cnpj
+
+import (
+	"log"
+	"testing"
+)
+
+func TestFormat(t *testing.T) {
+	log.Printf(Format("03794020685"))
+}
+
+func TestCheck(t *testing.T) {
+	for _, v := range []string{
+		"60.119.200/0001-90",
+	} {
+		ret := Check(v)
+		log.Printf("%s=>%v", v, ret)
+	}
+
+}