author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Fri, 04 Sep 2015 14:06:56 +0100 | |
changeset 535 | a8feb0f47574 |
parent 421 | 7e08b31e0dae |
child 650 | 4c6ed0a28d18 |
permissions | -rw-r--r-- |
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"{ Package: 'stx:goodies/petitparser' }" |
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Object subclass:#PPContextMemento |
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instanceVariableNames:'stream position properties' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'PetitParser-Core' |
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! |
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!PPContextMemento methodsFor:'accessing'! |
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position |
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^ position |
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! |
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position: anInteger |
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position := anInteger |
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! |
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stream |
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^ stream |
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! |
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stream: aStream |
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stream := aStream |
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! ! |
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!PPContextMemento methodsFor:'accessing - properties'! |
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hasProperty: aKey |
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"Test if the property aKey is present." |
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^ properties notNil and: [ properties includesKey: aKey ] |
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! |
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keysAndValuesDo: aBlock |
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properties ifNil: [ ^ self ]. |
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properties keysAndValuesDo: [ :key :value | aBlock value: key value: value copy ] |
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! |
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propertiesSize |
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properties ifNil: [ ^ 0 ]. |
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^ properties size. |
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! |
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propertyAt: aKey |
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"Answer the property value associated with aKey." |
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^ self propertyAt: aKey ifAbsent: [ self error: 'Property not found' ] |
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! |
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propertyAt: aKey ifAbsent: aBlock |
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"Answer the property value associated with aKey or, if aKey isn't found, answer the result of evaluating aBlock." |
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properties isNil |
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ifTrue: [ ^ aBlock value ] |
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ifFalse: [ |
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(properties includesKey: aKey) ifTrue: [ |
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^ (properties at: aKey) copy |
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]. |
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^ aBlock value |
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] |
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! |
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propertyAt: aKey ifAbsentPut: aBlock |
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"Answer the property associated with aKey or, if aKey isn't found store the result of evaluating aBlock as new value." |
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^ self propertyAt: aKey ifAbsent: [ self propertyAt: aKey put: aBlock value ] |
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! |
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propertyAt: aKey put: anObject |
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"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." |
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^ (properties ifNil: [ properties := Dictionary new: 1 ]) |
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at: aKey put: (anObject copy) |
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! |
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removeProperty: aKey |
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"Remove the property with aKey. Answer the property or raise an error if aKey isn't found." |
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^ self removeProperty: aKey ifAbsent: [ self error: 'Property not found' ] |
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! |
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removeProperty: aKey ifAbsent: aBlock |
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"Remove the property with aKey. Answer the value or, if aKey isn't found, answer the result of evaluating aBlock." |
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| answer | |
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properties isNil ifTrue: [ ^ aBlock value ]. |
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answer := properties removeKey: aKey ifAbsent: aBlock. |
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properties isEmpty ifTrue: [ properties := nil ]. |
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^ answer |
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! ! |
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!PPContextMemento methodsFor:'comparing'! |
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= anObject |
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(self == anObject) ifTrue: [ ^ true ]. |
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(anObject class = PPContextMemento) ifFalse: [ ^ false ]. |
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(anObject stream == stream) ifFalse: [ ^ false ]. |
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(anObject position = position) ifFalse: [ ^ false ]. |
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(self propertiesSize = anObject propertiesSize) ifFalse: [ ^ false ]. |
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self keysAndValuesDo: [ :key :value | |
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(anObject hasProperty: key) ifFalse: [ ^ false ]. |
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((anObject propertyAt: key) = value) ifFalse: [ ^ false ]. |
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]. |
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^ true. |
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! |
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hash |
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^ (position hash bitXor: stream hash) bitXor: properties hash. |
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! ! |
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