go/bottle-song/coverage.html


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				<option value="file0">bottlesong/bottle_song.go (100.0%)</option>
				
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				<span>not tracked</span>
			
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		<pre class="file" id="file0" style="display: none">// Package bottlesong generates the lrics to the Ten Green Bottles Bootles song.
// Adapted from the 99 Bottles of Beer exercise.
package bottlesong

import (
        "errors"
        "fmt"
        "strings"
)

// Number type let's us map numbers to strings for the song.
type Number int

// The numbers.
const (
        Zero Number = iota
        One
        Two
        Three
        Four
        Five
        Six
        Seven
        Eight
        Nine
        Ten
)

// The lower and upper bound numbers.
const (
        MinNumber = One
        MaxNumber = Ten
)

// NumberNames maps Number to string representations.
var NumberNames = map[Number]string{
        Zero:  "Zero",
        One:   "One",
        Two:   "Two",
        Three: "Three",
        Four:  "Four",
        Five:  "Five",
        Six:   "Six",
        Seven: "Seven",
        Eight: "Eight",
        Nine:  "Nine",
        Ten:   "Ten",
}

// String implements the Stringer interface for a Number.
func (n Number) String() string <span class="cov8" title="126">{
        return NumberNames[n]
}</span>

// Int implements the Stringer interface for a Number.
func (n Number) Int() int <span class="cov10" title="325">{
        return int(n)
}</span>

// Verse returns a single verse from 99 Bottles of Beer on the Wall song.
func Verse(bootleCount int) (string, error) <span class="cov6" title="44">{
        fs1 := "%[1]s green bottle%[2]s hanging on the wall,\n"
        fs2 := "And if one green bottle should accidentally fall,\n"
        fs3 := "There'll be %[1]s green bottle%[2]s hanging on the wall.\n"

        var plural string

        if bootleCount &lt; MinNumber.Int() </span><span class="cov1" title="1">{
                return "", errors.New("you can't have zero or less bottles")
        }</span>

        <span class="cov6" title="43">if bootleCount &gt; MaxNumber.Int() </span><span class="cov1" title="1">{
                return "", errors.New("you can't have more than 10 bottles")
        }</span>

        <span class="cov6" title="42">if bootleCount &gt; MinNumber.Int() </span><span class="cov6" title="36">{
                plural = "s"
        }</span>

        <span class="cov6" title="42">line1 := fmt.Sprintf(fs1, Number(bootleCount).String(), plural)
        line2 := fmt.Sprintf(fs1, Number(bootleCount).String(), plural)

        line3 := fs2

        bootleCount--

        if bootleCount == Zero.Int() || bootleCount &gt; MinNumber.Int() </span><span class="cov6" title="37">{
                plural = "s"
        }</span> else<span class="cov3" title="5"> {
                plural = ""
        }</span>

        <span class="cov6" title="42">bootleWord := strings.ToLower(Number(bootleCount).String())

        // yeah, I could have just used 0 here.
        if bootleCount == Zero.Int() </span><span class="cov3" title="6">{
                bootleWord = "no"
                plural = "s"
        }</span>

        <span class="cov6" title="42">line4 := fmt.Sprintf(fs3, bootleWord, plural)

        return line1 + line2 + line3 + line4, nil</span>
}

// Verses returns select verselyricss 10 Green Bottles Hanging on the Wall song.
func Verses(start, takeDown int) (string, error) <span class="cov5" title="19">{
        var verses string

        if start &lt; takeDown </span><span class="cov1" title="1">{
                return "", fmt.Errorf("not enough bottles %[1]d to take down %[2]d", start, takeDown)
        }</span>

        <span class="cov5" title="18">for line, count := start, takeDown; count &gt; 0; line, count = line-1, count-1 </span><span class="cov6" title="39">{
                // This can't return an error because because of the other fast fails are making sure line is valid here.
                verse, _ := Verse(line)

                verses += verse

                if count &gt; 1 </span><span class="cov5" title="21">{
                        verses += "\n"
                }</span>
        }

        <span class="cov5" title="18">return verses, nil</span>
}

// Recite returns the verses of the song.
func Recite(startBottles, takeDown int) []string <span class="cov5" title="20">{
        if startBottles &lt; MinNumber.Int() || startBottles &gt; MaxNumber.Int() </span><span class="cov1" title="1">{
                return []string{}
        }</span>

        <span class="cov5" title="19">if takeDown &lt; MinNumber.Int() || takeDown &gt; MaxNumber.Int() </span><span class="cov1" title="1">{
                return []string{}
        }</span>

        <span class="cov5" title="18">data, _ := Verses(startBottles, takeDown)
        lines := strings.Split(data, "\n")

        return lines[:len(lines)-1]</span>
}
</pre>
		
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