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Brian Buller
2016-08-13 18:20:14 -05:00
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# Food Chain
Write a program that generates the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'
Write a program that generates the lyrics to the song
"I know an old lady who swallowed a fly". While you could
copy/paste the lyrics, or read them from a file, this
problem is much more interesting if you approach it
algorithmically.
This is a [cumulative song](http://en.wikipedia.org/wiki/Cumulative_song) of unknown origin.
This is one of many common variants.
```plain
I know an old lady who swallowed a fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a spider.
It wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a bird.
How absurd to swallow a bird!
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a cat.
Imagine that, to swallow a cat!
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a dog.
What a hog, to swallow a dog!
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a goat.
Just opened her throat and swallowed a goat!
She swallowed the goat to catch the dog.
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a cow.
I don't know how she swallowed a cow!
She swallowed the cow to catch the goat.
She swallowed the goat to catch the dog.
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.
I know an old lady who swallowed a horse.
She's dead, of course!
```
To run the tests simply run the command `go test` in the exercise directory.
If the test suite contains benchmarks, you can run these with the `-bench`
flag:
go test -bench .
For more detailed info about the Go track see the [help
page](http://help.exercism.io/getting-started-with-go.html).
## Source
Wikipedia [view source](http://en.wikipedia.org/wiki/There_Was_an_Old_Lady_Who_Swallowed_a_Fly)

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go/food-chain/food_chain.go Normal file
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package foodchain
import (
"fmt"
"strings"
)
// TestVersion is an exercism thing
const TestVersion = 1
// An Inedible is something that you probably shouldn't eat.
// At the least, you shouldn't eat it whole/live.
type Inedible struct {
// What it is
Name string
// A quick jab about it
FollowUp string
}
// DoNotEat is a non-exhaustive list of Inedibles. It's recommended
// that you don't eat them. Yet the old lady did.
var DoNotEat = []Inedible{
Inedible{
"fly", "I don't know why she swallowed the fly. Perhaps she'll die.",
},
Inedible{
"spider", "It wriggled and jiggled and tickled inside her.",
},
Inedible{
"bird", "How absurd to swallow a bird!",
},
Inedible{
"cat", "Imagine that, to swallow a cat!",
},
Inedible{
"dog", "What a hog, to swallow a dog!",
},
Inedible{
"goat", "Just opened her throat and swallowed a goat!",
},
Inedible{
"cow", "I don't know how she swallowed a cow!",
},
Inedible{
"horse", "She's dead, of course!",
},
}
// Verse generates the text for a specific verse
func Verse(verseNum int) string {
return strings.Trim(Swallow(verseNum-1, true), "\n")
}
// Verses generates the text for all verses from verse1 to verse2
func Verses(verse1, verse2 int) string {
var ret string
for verse1 <= verse2 {
ret += Verse(verse1) + "\n\n"
verse1++
}
return strings.Trim(ret, "\n")
}
// Song generates all verses
func Song() string {
var ret string
for verseNum := 1; verseNum <= len(DoNotEat); verseNum++ {
ret += Verse(verseNum) + "\n\n"
}
return strings.Trim(ret, "\n")
}
// Swallow generates the text for swallowing something
func Swallow(dneIdx int, first bool) string {
var ret string
if first || dneIdx == len(DoNotEat)-1 {
ret = fmt.Sprintf(
"I know an old lady who swallowed a %s.\n%s\n",
DoNotEat[dneIdx].Name,
DoNotEat[dneIdx].FollowUp,
)
if dneIdx == 0 || dneIdx == len(DoNotEat)-1 {
return ret
}
}
ret += fmt.Sprintf("She swallowed the %s to catch the %s",
DoNotEat[dneIdx].Name,
DoNotEat[dneIdx-1].Name,
)
if DoNotEat[dneIdx-1].Name == "spider" {
ret += " that wriggled and jiggled and tickled inside her.\n"
} else if DoNotEat[dneIdx-1].Name == "fly" {
ret += ".\nI don't know why she swallowed the fly. Perhaps she'll die.\n"
return ret
} else {
ret += ".\n"
}
return ret + Swallow(dneIdx-1, false)
}

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package foodchain
import (
"strings"
"testing"
)
const testVersion = 1
func TestTestVersion(t *testing.T) {
if TestVersion != testVersion {
t.Errorf("Found TestVersion = %v, want %v.", TestVersion, testVersion)
}
}
var ref = []string{``,
`I know an old lady who swallowed a fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a spider.
It wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a bird.
How absurd to swallow a bird!
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a cat.
Imagine that, to swallow a cat!
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a dog.
What a hog, to swallow a dog!
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a goat.
Just opened her throat and swallowed a goat!
She swallowed the goat to catch the dog.
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a cow.
I don't know how she swallowed a cow!
She swallowed the cow to catch the goat.
She swallowed the goat to catch the dog.
She swallowed the dog to catch the cat.
She swallowed the cat to catch the bird.
She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed the fly. Perhaps she'll die.`,
`I know an old lady who swallowed a horse.
She's dead, of course!`,
}
func TestVerse(t *testing.T) {
for v := 1; v <= 8; v++ {
if ret := Verse(v); ret != ref[v] {
t.Fatalf("Verse(%d) =\n%s\n want:\n%s\n", v, ret, ref[v])
}
}
}
func TestVerses(t *testing.T) {
if ret, want := Verses(1, 2), ref[1]+"\n\n"+ref[2]; ret != want {
t.Fatalf("Verses(1, 2) =\n%s\n want:\n%s\n", ret, want)
}
}
func TestSong(t *testing.T) {
if ret, want := Song(), strings.Join(ref[1:], "\n\n"); ret != want {
t.Fatalf("Song() =\n%s\n want:\n%s\n", ret, want)
}
}
func BenchmarkSong(b *testing.B) {
for i := 0; i < b.N; i++ {
Song()
}
}