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coverage.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>luhn: Go Coverage Report</title>
<style>
body {
background: black;
color: rgb(80, 80, 80);
}
body, pre, #legend span {
font-family: Menlo, monospace;
font-weight: bold;
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position: fixed;
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height: 42px;
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margin-top: 50px;
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float: left;
margin-left: 10px;
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margin-top: 10px;
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</style>
</head>
<body>
<div id="topbar">
<div id="nav">
<select id="files">
<option value="file0">luhn/luhn.go (90.9%)</option>
</select>
</div>
<div id="legend">
<span>not tracked</span>
<span class="cov0">no coverage</span>
<span class="cov1">low coverage</span>
<span class="cov2">*</span>
<span class="cov3">*</span>
<span class="cov4">*</span>
<span class="cov5">*</span>
<span class="cov6">*</span>
<span class="cov7">*</span>
<span class="cov8">*</span>
<span class="cov9">*</span>
<span class="cov10">high coverage</span>
</div>
</div>
<div id="content">
<pre class="file" id="file0" style="display: none">// Package luhn is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers and Canadian Social Insurance Numbers.
package luhn
import (
"fmt"
"regexp"
"strconv"
"strings"
)
// debug set to true to enable debugging output.
var debug bool = false
// dPrint prints the passed output when the global var `debug` is true.
func dPrint(s string, a ...interface{}) <span class="cov10" title="438">{
if debug </span><span class="cov0" title="0">{
fmt.Println("DEBUG:", s, "=", a)
}</span>
}
// reverse returns a reversed string.
func reverse(s string) string <span class="cov5" title="17">{
var b string
for _, r := range s </span><span class="cov8" title="189">{
b = string(r) + b
}</span>
<span class="cov5" title="17">return b</span>
}
// isValidInput returns true when the string only has digits or spaces in it and has a length greater than 1.
func isValidInput(s string) bool <span class="cov5" title="26">{
if len(s) <= 1 </span><span class="cov2" title="3">{
return false
}</span>
<span class="cov5" title="23">m, e := regexp.MatchString(`^[0-9]+$`, s)
if e != nil </span><span class="cov0" title="0">{
panic(e)</span>
}
<span class="cov5" title="23">return m</span>
}
// Valid returns true when the passed number (`string`) is a valid luhn number.
func Valid(id string) bool <span class="cov5" title="26">{
var sum int
dPrint("id", id)
// 0. remove spaces from the string
id = strings.ReplaceAll(id, " ", "")
// 1. is the string is valid?
if !isValidInput(id) </span><span class="cov4" title="9">{
return false
}</span>
<span class="cov5" title="17">dPrint("id", id)
di := reverse(id)
dPrint("di", di)
// 2. reverse the string
// 3. double numbers with index 1, 3, 5, ...
// 4. if the doubled number is > 9, subtract 9 from it
// 5. sum the numbers.
for i, r := range di </span><span class="cov8" title="189">{
dPrint("r", string(r))
s := string(r)
n, e := strconv.Atoi(s)
if e != nil </span><span class="cov0" title="0">{
panic(e)</span>
}
<span class="cov8" title="189">if i%2 != 0 </span><span class="cov7" title="90">{
n *= 2
if n > 9 </span><span class="cov6" title="56">{
n -= 9
}</span>
}
<span class="cov8" title="189">dPrint("n", n)
sum += n</span>
}
// 6. if the sum is divisible by 10, it's valid
<span class="cov5" title="17">return sum%10 == 0</span>
}
</pre>
</div>
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