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(OO/humor version for gst)
| Date: | 06/11/07 |
| Author: | Paul H. Hargrove |
| URL: | n/a |
| Comments: | 2 |
| Info: | http://www.gnu.org/software/smalltalk/ |
| Score: |  (3.00 in 28 votes) |
" OO version for Smalltalk "
" Paul H. Hargrove 2007.06.10 "
" "
" Some people claim Smalltalk allows one to take OO to ridiculous extremes. "
" This program attempts to demonstrate that (with suitable self-ridicule). "
" Excluding the comments, no method is longer than three 80-char lines. "
" For aggressive code reuse, no string literal appears more than once. "
" 99 bottles is the default, but other lengths can be specified at "
" object instantiation. "
" "
" Written for and tested w/ GNU Smalltalk 2.3.5 "
!Number methodsFor: 'drinking songs'!
asBottles
"String factory: turns bottle count into English"
^((self = 0) ifTrue: ['no more'] ifFalse: [self printString]),
' bottle', ((self = 1) ifTrue: [' '] ifFalse: ['s ']), 'of beer'.
! !
!String methodsFor: 'drinking songs'!
initialUpper |s|
"String factory: generates a copy with an initial capital"
^(s := (String withAll: self)) at: 1 put: (s first asUppercase); yourself.
! !
"Objects of class BeerSong are songs. Send asString to return the lyrics."
Object subclass: #BeerSong
instanceVariableNames: 'lyrics sizeOfWall bottleCount bottleString'
classVariableNames: ''
poolDictionaries: ''
category: 'Drinking-Songs'
! !
!BeerSong class methodsFor: 'instantiation'!
new
"new: with default song length of 99 bottles"
^self new: 99.
!
new: wallSizeInUnitsOfBottles
^super new initialize: wallSizeInUnitsOfBottles
! !
!BeerSong methodsFor: 'initialization'!
initialize: aNumber
"We generate the lyrics lazily when you show: them"
"So initially we just set the maximum and current counts"
lyrics := WriteStream on: String new.
sizeOfWall := aNumber.
bottleCount := 0.
!
!BeerSong methodsFor: 'manipulating bottles'!
adjust: aNumber
"Changes the bottleCount and updates bottleString to match"
bottleString := (bottleCount := bottleCount + aNumber) asBottles.
!
buyBeer
"Buy as much beer as will fit on my wall"
"ToDo: could we buy 'splits' when sizeOfWall is non-integer?"
"ToDo: if sizeOfWall < 0 do we sell beer?"
self adjust: sizeOfWall truncated.
!
drinkOne
"What inevitably happens when passing beer bottles among friends"
self adjust: -1.
!
report
"Who keeps beer on a wall? Is the fridge full of snacks?"
^bottleString, ' on the wall'.
!
!BeerSong methodsFor: 'private utilities'!
planParty
"Let's party, we'll need tunes and some brews"
self purchase.
!
breathe
"Breathe after each verse, to avoid passing out"
lyrics nextPutAll: '.'; nl; nl.
!
!BeerSong methodsFor: 'singing verses'!
checkWall
"I'm still sober enough to capitalize"
lyrics nextPutAll: self report initialUpper;
nextPutAll: ', ', bottleString, '.'; nl.
^bottleCount >= 1.
!
takeDown
"Hey buddy, could you pass me a cold one?"
lyrics nextPutAll: 'Take one down and pass it around, ';
nextPutAll: self drinkOne report.
self breathe.
!
passOut
"Anybody sober enough to make it to the store and back?"
lyrics nextPutAll: 'Go to the store and buy some more... ';
nextPutAll: self report.
self breathe.
!
drinkBeer
"The party's not over 'till the beer runs out"
[self checkWall] whileTrue: [self takeDown].
!
throwParty
"The next one of these has got to be BYOB"
self buyBeer drinkBeer buyBeer passOut.
!
asString
"We generate the lyrics only once and cache them"
lyrics isEmpty ifTrue: [ self throwParty ].
^lyrics contents.
! !
"For a shorter song: Transcript show: (BeerSong new: 2)!"
Transcript show: BeerSong new!
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Alternative Versions
| Version | Author | Date | Comments | Rate |
|---|---|---|---|---|
| Squeak, VisualWorks | Jim Freeman | 07/03/05 | 4 | |
| standard version | Patrick M. Ryan | 04/20/05 | 0 | |
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Comments
Shows off the feature of extending core classes. I like this version better than the block closure-using one. Reason for this being that it appeals more to common programming techniques (and my personal dislike of heavy block closure usage).