islands/XmlFeedParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Wed, 24 Jul 2019 21:13:30 +0000
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"{ Package: 'stx:goodies/petitparser/islands' }"
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"{ NameSpace: Smalltalk }"
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PPCompositeParser subclass:#XmlFeedParser
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	instanceVariableNames:'item openItem itemContent closeItem openShoplist shoplistContent
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		closeShoplist shoplist simpleElement stringValue'
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	classVariableNames:''
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	poolDictionaries:''
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	category:'PetitIslands-Examples'
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!
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XmlFeedParser comment:'A XmlFeedParser is Parser of a fake shop feed. Shop feed is a XML file with information about shop products. Shop feed can be malformed (for any reason) the parser will recover from malformed item and will continue on the next valid item.
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Instance Variables
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	closeItem:		<Object>
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	closeName:		<Object>
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	closeShoplist:		<Object>
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	item:		<Object>
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	itemContent:		<Object>
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	name:		<Object>
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	nameContent:		<Object>
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	openItem:		<Object>
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	openName:		<Object>
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	openShoplist:		<Object>
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	shoplist:		<Object>
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	shoplistContent:		<Object>
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	simpleElement:		<Object>
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	stringValue:		<Object>
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closeItem
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	- xxxxx
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closeName
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	- xxxxx
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closeShoplist
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	- xxxxx
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item
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	- xxxxx
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itemContent
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	- xxxxx
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name
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	- xxxxx
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nameContent
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	- xxxxx
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openItem
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	- xxxxx
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openName
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	- xxxxx
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openShoplist
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	- xxxxx
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shoplist
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	- xxxxx
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shoplistContent
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	- xxxxx
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simpleElement
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	- xxxxx
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stringValue
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	- xxxxx
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'
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!
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!XmlFeedParser methodsFor:'grammar'!
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item
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	^ (openItem, itemContent trim, closeItem) trim ==> #second
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!
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itemContent
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	^ (simpleElement trim star) ==> self elementsToDictionaryBlock
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!
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shoplist
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	^ (openShoplist, shoplistContent, closeShoplist) trim ==> #second
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!
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shoplistContent
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	^ (item island ==> #second) star
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!
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start
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	^ shoplist
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stringValue
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	^ (#letter asParser / #digit asParser) star flatten trim
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! !
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!XmlFeedParser methodsFor:'tags'!
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closeItem
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	^ '</' asParser, 'item' asParser trim, '>' asParser
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!
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closeShoplist
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	^ '</' asParser, 'shoplist' asParser trim, '>' asParser
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!
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openItem
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	^ '<' asParser, 'item' asParser trim, '>' asParser
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!
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openShoplist
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	^ '<' asParser, 'shoplist' asParser trim, '>' asParser
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! !
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!XmlFeedParser methodsFor:'xmlSupport'!
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elementsToDictionaryBlock
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 	^ [ :elements | | d | 
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		d := Dictionary new.
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		elements do: [ :e | d at: e first asSymbol put: e second ].
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		d
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	]
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!
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simpleElement
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	^ (
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		(('<' asParser, stringValue trim, '>' asParser) ==> #second),
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		stringValue,
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		(('</' asParser, stringValue trim, '>' asParser) ==> #second)
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	) ==> [ :elements |
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		(elements first = elements third) 
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		ifTrue: [ Array with: elements first with: elements second ]
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		ifFalse: [ PPFailure message: 'malformed element' ]
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 	]
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! !
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