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3678
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"{ Package: 'stx:libbasic2' }"
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"{ NameSpace: Smalltalk }"
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Object subclass:#TextClassifier
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instanceVariableNames:'wordBag sentences docCounts wordCounts wordFrequencyCounts
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categories vocabulary'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Text-Support'
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!
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!TextClassifier class methodsFor:'documentation'!
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documentation
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"
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3682
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an initial experiment in text classification.
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3678
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see BayesClassifierTest
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[author:]
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cg
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"
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! !
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!TextClassifier class methodsFor:'instance creation'!
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new
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"return an initialized instance"
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^ self basicNew initialize.
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! !
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!TextClassifier methodsFor:'initialization'!
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initialize
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"Invoked when a new instance is created."
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wordBag := Bag new.
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"/ sentences := nil.
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docCounts := Dictionary new.
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wordCounts := Dictionary new.
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wordFrequencyCounts := Dictionary new.
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categories := Set new.
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vocabulary := Set new.
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"/ super initialize. -- commented since inherited method does nothing
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!
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initializeCategory:categoryName
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(categories includes:categoryName) ifFalse:[
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docCounts at:categoryName put:0.
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wordCounts at:categoryName put:0.
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wordFrequencyCounts at:categoryName put:(Dictionary new).
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categories add:categoryName
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].
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! !
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!TextClassifier methodsFor:'text handling'!
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collectWords:lines
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"computes words from lines"
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|words|
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words := lines collectAll:[:l |
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l asCollectionOfSubCollectionsSeparatedByAnyForWhich:[:ch | ch isLetterOrDigit not]
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].
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^ words
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!
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dehyphenate:linesCollection
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"join hypens"
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|lines partialLine|
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lines := OrderedCollection new.
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linesCollection do:[:eachLine |
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|l isHyphenated|
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l := eachLine withoutSeparators.
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l notEmptyOrNil ifTrue:[
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isHyphenated := (l endsWith:'-')
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and:[ l size > 1
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and:[ (l at:(l size-1)) isLetter ]].
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isHyphenated ifFalse:[
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partialLine := (partialLine ? '') , l.
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lines add:partialLine.
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partialLine := nil.
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] ifTrue:[
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l := l copyButLast.
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partialLine := (partialLine ? '') , l.
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].
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].
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].
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partialLine notEmptyOrNil ifTrue:[
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lines add:partialLine
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].
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^ lines
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!
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tokenize:string
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|rawLines lines allWords|
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rawLines := string asCollectionOfLines.
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lines := self dehyphenate:rawLines.
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allWords := self collectWords:lines.
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^ allWords
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! !
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!TextClassifier class methodsFor:'documentation'!
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version
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^ '$Header$'
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!
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version_CVS
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^ '$Header$'
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! !
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