"
I am a basic structure represing a class being compiled.

The CodeGen (or more of them) can operate on me, adding methods.

I keep track of methods, ids, and inlined methods as well as the return variables for code gen.

In the end ClassBuilder can create a Smalltalk class from my data.
"
Class {
	#name : 'PPCClass',
	#superclass : 'Object',
	#instVars : [
		'methodDictionary',
		'currentMethod',
		'constants',
		'idGen',
		'methodStack',
		'returnVariable',
		'properties'
	],
	#category : 'PetitCompiler-Compiler-Codegen'
}

{ #category : 'instance creation' }
PPCClass class >> new [
	"return an initialized instance"

	^ self basicNew initialize.
]

{ #category : 'constants' }
PPCClass >> addConstant: value as: name [    
	(constants includesKey: name) ifTrue:[ 
		(constants at: name) ~= value ifTrue:[ 
			self error:'Duplicate constant!'.
		].
		^ self.
	].
	constants at: name put: value

	"Modified: / 29-05-2015 / 07:22:39 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'variables' }
PPCClass >> allocateReturnVariable [    
	^ self allocateReturnVariableNamed: 'retval'

	"Created: / 23-04-2015 / 18:03:40 / Jan Vrany <jan.vrany@fit.cvut.cz>"
	"Modified: / 15-06-2015 / 17:52:56 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'variables' }
PPCClass >> allocateReturnVariableNamed: name [
	"Allocate (or return previously allocated one) temporary variable used for
	 storing a parser's return value (the parsed object)"                 
	^ currentMethod allocateReturnVariableNamed: name

	"Created: / 15-06-2015 / 18:04:48 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'variables' }
PPCClass >> allocateTemporaryVariableNamed: preferredName [ 
	"Allocate a new variable with (preferably) given name.
	 Returns a real variable name that should be used."
	
	^ self currentNonInlineMethod allocateTemporaryVariableNamed: preferredName

	"Created: / 23-04-2015 / 17:33:31 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'ids' }
PPCClass >> asClassName: string [
	"e.g. '234znak 43 ) 2' asLegalSelector = #v234znak432"
	
	| toUse |

	toUse := string asString select: [:char | char isAlphaNumeric or: [ char = $_ ] ].
	(toUse isEmpty or: [ toUse first isLetter not ])
		ifTrue: [ toUse := 'v', toUse ].

	toUse first isLowercase ifTrue: [
		toUse := toUse copy.
		toUse at: 1 put: toUse first asUppercase		
	].
	^ toUse asSymbol

	"Modified: / 10-05-2015 / 07:29:57 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'ids' }
PPCClass >> asSelector: string [
	"e.g. '234znak 43 ) 2' asLegalSelector = #v234znak432"
	
	| toUse |

	toUse := string select: [:char | char isAlphaNumeric or: [ char = $_ ] ].
	(toUse isEmpty or: [ toUse first isLetter not ])
		ifTrue: [ toUse := 'v', toUse ].
	toUse first isUppercase ifFalse:[
		toUse := toUse copy.
		toUse at: 1 put: toUse first asLowercase
	].
	^toUse

	"Modified: / 10-05-2015 / 07:29:57 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'method cache' }
PPCClass >> cachedMethod: id [
	^ methodDictionary at: id ifAbsent: [ nil ]
]

{ #category : 'method cache' }
PPCClass >> cachedMethod: id ifPresent: aBlock [
	^ methodDictionary at: id ifPresent: aBlock
]

{ #category : 'accessing' }
PPCClass >> classVariables [
	^ constants keys asArray
]

{ #category : 'accessing' }
PPCClass >> constants [
	^ constants
]

{ #category : 'accessing' }
PPCClass >> currentMethod [
	^ currentMethod 
]

{ #category : 'accessing' }
PPCClass >> currentNonInlineMethod [
	^ methodStack 
		detect:[:m | m isInline not ] 
		ifNone:[ self error: 'No non-inlined method']

	"Created: / 23-04-2015 / 17:33:31 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'accessing' }
PPCClass >> currentReturnVariable [
	^ currentMethod returnVariable 
]

{ #category : 'accessing-properties' }
PPCClass >> hasProperty: aKey [
	"Test if the property aKey is present."
	
	^ properties notNil and: [ properties includesKey: aKey ]
]

{ #category : 'ids' }
PPCClass >> idFor: anObject [
	^ idGen idFor: anObject
]

{ #category : 'ids' }
PPCClass >> idFor: anObject defaultName: defaultName [
	^ idGen idFor: anObject defaultName: defaultName
]

{ #category : 'accessing' }
PPCClass >> idGen [
	^ idGen
]

{ #category : 'accessing' }
PPCClass >> idGen: anObject [
	idGen := anObject
]

{ #category : 'accessing' }
PPCClass >> ids [
	^ idGen ids
]

{ #category : 'initialization' }
PPCClass >> initialize [
	super initialize.

	methodStack := Stack new.
	methodDictionary := IdentityDictionary new.
	constants := Dictionary new.
	idGen := PPCIdGenerator new.
]

{ #category : 'accessing' }
PPCClass >> instanceAndClassVariables [
	| collection |
	collection := OrderedCollection new.
	collection addAll: self instanceVariables.
	collection addAll: self classVariables.
	^ collection
]

{ #category : 'accessing' }
PPCClass >> instanceVariables [
	^ #()
]

{ #category : 'accessing' }
PPCClass >> methodDictionary [
	^ methodDictionary
]

{ #category : 'accessing' }
PPCClass >> name [
	^ self asClassName: (self propertyAt: #name)
]

{ #category : 'accessing' }
PPCClass >> name: value [
	^ self propertyAt: #name put: value
]

{ #category : 'ids' }
PPCClass >> numberIdFor: object [
	^ idGen numericIdFor: object
]

{ #category : 'support' }
PPCClass >> parsedValueOf: aBlock to: aString [
	| tmpVarirable method |

	self assert:aBlock isBlock.
	self assert:aString isNil not.
	
	tmpVarirable := returnVariable.
	returnVariable := aString.
	method := [
		aBlock value
	] ensure:[ returnVariable := tmpVarirable ].

	self assert: (method isMethod).	
	^ method
]

{ #category : 'support' }
PPCClass >> pop [
	| retval |
	retval := methodStack pop.
	currentMethod := methodStack isEmpty 
		ifTrue: [ nil ]
		ifFalse: [ methodStack top ].
	^ retval

	"Modified: / 21-11-2014 / 12:27:25 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'accessing-properties' }
PPCClass >> properties [
	^ properties
]

{ #category : 'accessing-properties' }
PPCClass >> properties: aDictionary [
	properties := aDictionary 
]

{ #category : 'accessing-properties' }
PPCClass >> propertyAt: aKey [ 
	^ self propertyAt: aKey  ifAbsent: [ nil ]
]

{ #category : 'accessing-properties' }
PPCClass >> propertyAt: aKey ifAbsent: aBlock [
	"Answer the property value associated with aKey or, if aKey isn't found, answer the result of evaluating aBlock."
	
	^ properties isNil
		ifTrue: [ aBlock value ]
		ifFalse: [ properties at: aKey ifAbsent: aBlock ]
]

{ #category : 'accessing-properties' }
PPCClass >> propertyAt: aKey ifAbsentPut: aBlock [
	"Answer the property associated with aKey or, if aKey isn't found store the result of evaluating aBlock as new value."
	
	^ self propertyAt: aKey ifAbsent: [ self propertyAt: aKey put: aBlock value ]
]

{ #category : 'accessing-properties' }
PPCClass >> propertyAt: aKey put: anObject [
	"Set the property at aKey to be anObject. If aKey is not found, create a new entry for aKey and set is value to anObject. Answer anObject."

	^ (properties ifNil: [ properties := Dictionary new: 1 ])
		at: aKey put: anObject
]

{ #category : 'support' }
PPCClass >> push [
	methodStack push: currentMethod.
	(methodStack size > 500 )ifTrue: [ self error: 'unless it is very complex grammar, there is an error somewhere' ]

	"Modified: / 21-11-2014 / 12:27:18 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'support' }
PPCClass >> returnVariable [
	self error: 'Should never be called and accessed outside this class'.
	^ returnVariable 
]

{ #category : 'accessing' }
PPCClass >> rootMethod [
	^ self propertyAt: #rootMethod ifAbsent: nil

]

{ #category : 'accessing' }
PPCClass >> rootMethod: value [
	^ self propertyAt: #rootMethod put: value

]

{ #category : 'accessing' }
PPCClass >> selectors [
	^ methodDictionary keys
]

{ #category : 'support' }
PPCClass >> startInline [
	| indentationLevel |
	indentationLevel := currentMethod indentationLevel.
	
	currentMethod := PPCInlinedMethod new.
	currentMethod returnVariable: returnVariable.
	currentMethod indentationLevel: indentationLevel.
	self push.

	"Modified: / 01-06-2015 / 21:48:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'support' }
PPCClass >> startInline: id [
	| indentationLevel |
	(methodDictionary includesKey: id) ifTrue: [ self error: 'OOOUPS!' ].
	indentationLevel := currentMethod indentationLevel.
	
	currentMethod := PPCInlinedMethod new.
	currentMethod id: id.   
	currentMethod returnVariable: returnVariable.
	currentMethod indentationLevel: indentationLevel.
	self push.

	"Modified: / 01-06-2015 / 21:48:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'support' }
PPCClass >> startMethod: id category: category [
	(methodDictionary includesKey: id) ifTrue: [ self error: 'OOOUPS!' ].

	currentMethod := PPCMethod new.
	currentMethod id: id.
	currentMethod category: category.
	
	self push.      
	self store: currentMethod as: id.

	"Modified: / 01-06-2015 / 21:19:41 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'support' }
PPCClass >> stopInline [
	^ self pop.

	"Modified: / 01-06-2015 / 21:37:59 / Jan Vrany <jan.vrany@fit.cvut.cz>"
]

{ #category : 'support' }
PPCClass >> stopMethod [
   self store: currentMethod as: currentMethod methodName.
	^ self pop.

]

{ #category : 'method cache' }
PPCClass >> store: method as: id [
	self assert: (method isKindOf: PPCMethod).
	methodDictionary at: id put: method.
]

{ #category : 'accessing' }
PPCClass >> superclass [
	^ self propertyAt: #superclass
]

{ #category : 'accessing' }
PPCClass >> superclass: value [
	^ self propertyAt: #superclass put: value
]