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10406753
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2012-05-02T01:57:15.123
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2012-05-02T01:57:15.123
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<p>Here's a VisualWorks Smalltalk version of the interpreter:</p> <pre><code>'From VisualWorks, 7.8 of March 30, 2011 on May 1, 2012 at 9:47:31 PM'! CodeComponent create: #package named: 'IntermediateInterpreter'!"Package IntermediateInterpreter*"! CodeComponent create: #package named: 'IntermediateInterpreter'! Smalltalk defineClass: #IntermediateInterpreter superclass: #{Core.Object} indexedType: #none private: false instanceVariableNames: 'lines currentLineNumber variables stack commands ' classInstanceVariableNames: '' imports: '' category: ''! !IntermediateInterpreter class methodsFor: 'instance creation'! new ^super new initialize ! ! !IntermediateInterpreter methodsFor: 'initialize-release'! initialize stack := OrderedCollection new. variables := Dictionary new. lines := OrderedCollection new. self initializeCommands ! initializeCommands commands := Dictionary new. commands at: 'READ' put: [:values | stack add: (self tokenize: (Dialog request: 'value?' initialAnswer: ''))]; at: 'STORE' put: [:values | variables at: values second put: stack removeLast]; at: 'PUSH' put: [:values | stack add: ((self isVariableName: values second) ifTrue: [variables at: values second] ifFalse: [values second])]; at: 'GREATER' put: [:values | | a b | b := stack removeLast. a := stack removeLast. stack add: (a > b ifTrue: [1.0] ifFalse: [0.0])]; at: 'MULTIPLY' put: [:values | | a b | b := stack removeLast. a := stack removeLast. stack add: a * b ]; at: 'MINUS' put: [:values | | a b | b := stack removeLast. a := stack removeLast. stack add: a - b ]; at: 'TESTFGOTO' put: [:values | (stack removeLast - 0.0) abs < 0.01 ifTrue: [currentLineNumber := values second]]; at: 'TESTTGOTO' put: [:values | (stack removeLast - 1.0) abs < 0.01 ifTrue: [currentLineNumber := values second]]; at: 'PRINT' put: [:values | Transcript show: stack removeLast printString; cr]; at: 'END' put: [:values | currentLineNumber := 0]! ! !IntermediateInterpreter methodsFor: 'testing'! isVariableName: aString (aString isKindOf: String) ifFalse: [^false]. ^aString first isAlphabetic! ! !IntermediateInterpreter methodsFor: 'interpreting'! interpret: aString self createLinesFrom: aString. currentLineNumber := 1. self interpret! interpret | tokens | [currentLineNumber = 0] whileFalse: [tokens := lines at: currentLineNumber. Transcript show: tokens printString; cr. currentLineNumber := currentLineNumber + 1. (commands at: tokens first asUppercase ifAbsent: [self error: 'Unknown command']) value: tokens]! tokenizeLine: aString ^(((aString tokensBasedOn: Character space) reject: [:each | each isEmpty]) collect: [:each | self tokenize: each]) asArray! tokenizeCurrentLine ^(((lines at: currentLineNumber) tokensBasedOn: Character space) reject: [:each | each isEmpty]) collect: [:each | self tokenize: each]! createLinesFrom: aString | stream | stream := aString readStream. [stream atEnd] whileFalse: [lines add: (self tokenizeLine: (stream upTo: Character cr))]! tokenize: each ^(self isVariableName: each) ifTrue: [each] ifFalse: [Number readFrom: each readStream]! ! </code></pre>
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