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# House
Write a program that outputs the nursery rhyme 'This is the House that Jack Built'.
> [The] process of placing a phrase of clause within another phrase of
> clause is called embedding. It is through the processes of recursion
> and embedding that we are able to take a finite number of forms (words
> and phrases) and construct an infinite number of expressions.
> Furthermore, embedding also allows us to construct an infinitely long
> structure, in theory anyway.
- [papyr.com](http://papyr.com/hypertextbooks/grammar/ph_noun.htm)
The nursery rhyme reads as follows:
```plain
This is the house that Jack built.
This is the malt
that lay in the house that Jack built.
This is the rat
that ate the malt
that lay in the house that Jack built.
This is the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the horse and the hound and the horn
that belonged to the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
```
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
British nursery rhyme [view source](http://en.wikipedia.org/wiki/This_Is_The_House_That_Jack_Built)

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go/house/house.go Normal file
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package house
// ASong holds the data we need to generate a song
type ASong struct {
start string
clauses []string
end string
}
// Embed takes two strings and returns a string with the embedded
func Embed(l, p string) string {
return l + " " + p
}
// Verse takes three things and returns a verse
func Verse(start string, clause []string, end string) string {
ret := start + " "
for i := 0; i < len(clause); i++ {
ret += clause[i] + " "
}
ret += end
return ret
}
// Song generates the whole song
func Song() string {
jackSong := ASong{
start: "This is",
clauses: []string{
"the horse and the hound and the horn\nthat belonged to",
"the farmer sowing his corn\nthat kept",
"the rooster that crowed in the morn\nthat woke",
"the priest all shaven and shorn\nthat married",
"the man all tattered and torn\nthat kissed",
"the maiden all forlorn\nthat milked",
"the cow with the crumpled horn\nthat tossed",
"the dog\nthat worried",
"the cat\nthat killed",
"the rat\nthat ate",
"the malt\nthat lay in",
},
end: "the house that Jack built.",
}
var ret string
for i := len(jackSong.clauses); i >= 0; i-- {
ret += Verse(jackSong.start, jackSong.clauses[i:], jackSong.end) + "\n\n"
}
// Trim the trailing "\n\n"
return ret[:len(ret)-2]
}

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// Embed embeds a noun phrase as the object of relative clause with a
// transitive verb.
//
// Argument relPhrase is a phrase with a relative clause, minus the object
// of the clause. That is, relPhrase consists of a subject, a relative
// pronoun, a transitive verb, possibly a preposition, but then no object.
//
// func Embed(relPhrase, nounPhrase string) string
// Verse generates a verse of a song with relative clauses that have
// a recursive structure.
//
// func Verse(subject string, relPhrases []string, nounPhrase string) string
//
// There are different ways to do this of course, but try using Embed as a
// subroutine and using programmatic recursion that reflects the grammatical
// recursion.
// Song generates the full text of "The House That Jack Built". Oh yes, you
// could just return a string literal, but humor us; use Verse as a subroutine.
//
// func Song() string
package house
import (
"fmt"
"strings"
"testing"
)
var (
s = "This is"
r = []string{
"the cat that broke",
"the vase that was on",
}
p = "the shelf."
last = len(r) - 1
// song copied from readme
song = `This is the house that Jack built.
This is the malt
that lay in the house that Jack built.
This is the rat
that ate the malt
that lay in the house that Jack built.
This is the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.
This is the horse and the hound and the horn
that belonged to the farmer sowing his corn
that kept the rooster that crowed in the morn
that woke the priest all shaven and shorn
that married the man all tattered and torn
that kissed the maiden all forlorn
that milked the cow with the crumpled horn
that tossed the dog
that worried the cat
that killed the rat
that ate the malt
that lay in the house that Jack built.`
)
func TestEmbed(t *testing.T) {
l := r[last]
want := l + " " + p
if e := Embed(l, p); e != want {
t.Fatalf("Embed(%q, %q) = %q, want %q.", l, p, e, want)
}
}
func TestVerse(t *testing.T) {
for i := len(r); i >= 0; i-- {
ri := r[i:]
want := s + " " + strings.Join(append(ri, p), " ")
if v := Verse(s, ri, p); v != want {
t.Fatalf("Verse(%q, %q, %q) = %q, want %q.", s, ri, p, v, want)
}
}
}
func TestSong(t *testing.T) {
s := Song()
if s == song {
return
}
fmt.Print(s)
// a little help in locating an error
got := strings.Split(s, "\n")
want := strings.Split(song, "\n")
var g, w string
var i int
for i, w = range want {
if len(got) <= i {
g = ""
break
}
if g = got[i]; g != w {
break
}
}
t.Fatalf("Song() line %d = %q, want %q", i+1, g, w)
}