lecture-y - websrv0a.sdu.dkwebsrv0a.sdu.dk/ups/swc/slides/lecture-xx-slides.pdf · • pim:...

6/13/16

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TEMPLATES,XML&XSLT

SSE02 UlrikSchultz ,MMMI 1

DynamicallygeneratedHTML (drivenbyhostlanguage)

• Context:dynamicallygeneratedhtml

• Keypoint:programsthat“print”htmlarehardtoread,embedcodeinsidehtmlinstead

• Concretetechnologies:JSP,ASP.NET

<html><ul><li>Coffee,10kr</li><li>Tea,5kr</li><li>Chocolate,7kr</li></ul></html>

voidprintPrices(List<Item>all){print(“<html>\n<ul>\n”);for(Itemi:all)print(“<li>”+i.name()+”,“+i.price()

+”kr</li>\n”);print(“</ul>\n</html>\n”);}

• Coffe,10kr• Tea,5kr• Chocolate,7kr


DynamicallygeneratedHTML (drivenbyhostlanguage)





<html><ul><li>Apple,2kr</li><li>Orange,3 kr</li><li>Kiwi,2 kr</li><li>Melon,30kr</li><li>Banana,5kr</li></ul></html>

<html><ul><li>Croissant,12kr</li><li>Baguette,17kr</li></ul></html>


voidprintPrices(List<Item>all){print(“<html>\n<ul>\n”);for(Itemi:all)print(“<li>”+i.name()+”,“+i.price()

+”kr</li>\n”);print(“</ul>\n</html>\n”);}






<html><ul>≪FORi:all≫><li>≪i.name()≫,≪i.price()≫ kr</li>

≪ENDFOR≫</ul></html>

DynamicallygeneratedHTML (drivenbyhostlanguage)<html>

<ul><li>Apple,2kr</li><li>Orange,3 kr</li><li>Kiwi,2 kr</li><li>Melon,30kr</li><li>Banana,5kr</li></ul></html>

<html><ul><li>Croissant,12kr</li><li>Baguette,17kr</li></ul></html>







DynamicallygeneratedHTML (drivenbyhostlanguage) • Coffe,10kr

• Tea,5kr• Chocolate,7kr

<html><ul>≪FORi:all≫><li>≪i.name()≫,≪i.price()≫ kr</li>

≪ENDFOR≫</ul></html>


• Context:generatedofcodeinsomelanguage

• Keypoint:programsthat“print”codearehardtoread,embedgeneratorinsidecodeinstead

• Concretetechnologies:JET,Velocity,xtend(xpand),…

voidprint_output(){printf(“Coffee,10kr\n”);printf(“Tea,5kr\n”);printf(“Chocolate,7kr”);}

voidprint_output(){≪FORi:all≫printf(“≪i.name()≫,≪i.price()≫ kr\n”);≪ENDFOR≫}

Generatedcode (drivenbyhostlanguage)


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• Context:generatedofcodeinsomelanguage

• Keypoint:programsthat“print”codearehardtoread,embedgeneratorinsidecodeinstead

• Concretetechnology:XSLT,generatesarbitraryoutputgivenXMLdocumentasinput

voidprint_output(){printf(“Coffee,10kr\n”);printf(“Tea,5kr\n”);printf(“Chocolate,7kr”);}

voidprint_output(){<xsl:for-eachselect=“item”>printf(“<xsl:value-of select=“name”/>,<xsl:value-of select=“price”/>kr\n”);

</xsl:for-each>}

Generatedcode(drivenbyXSLT)


<itemname=“Coffee”price=“10”/><itemname=“Tea”price=”5”/><itemname=“Chocolate”price=”7”/>

Assessment• Template-based programming (JET)suitable for“quick-and-dirty”codegenerators– easytostart,modify,evolve– maintenancecanbetricky– limitedpowercomparedtofullcompiler

• Languageworkbench:powerful, complex• Templates builtintohostlanguage (xtend):fairlyflexible,mustunderstandframeworkandlanguage

• XML/XSLT:easy fortheright tasks,relativelysimple


MDSDModel-Driven SoftwareDevelopment

SWC UlrikSchultz ,MMMI 9

Goal:“SoftwareFactories”• Automation =>

– increased development speed– enhanced software quality

• Separationof concerns =>– maintainabilitythroughredundancy avoidance andmanageability oftechnologicalchanges

• Softwareproduct line=>– reusability– expert knowledge insoftware form

• Programming abstraction=>– manageability ofcomplexity– productive environment


MDSD• MDSD=Model-Driven SoftwareDevelopment

– modelsare abstract andformalat the sametime– modelsare part ofthesoftware (notjustdocumentation)

• Keyconcepts:– Domain-Specific Language (definedbymetamodel)– Domain-specificplatform

• Approach:– FormalmodelspecifiedusingDSL– Automatically transformed tocodeusingdomain-specificplatform

– Supplemented bymanuallywritten codeasappropriate


MDSD


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MDSDusingxtextxtext

grammarDSLprogram(statemachine,guispec,…)

plugincode(e.g.,actions)

generatedcodeSWC UlrikSchultz ,MMMI 13

xtendgenerator

library,framework

MDSDusingXSLTXMLXML

documents

hand-writtenCcode

generatedcodefromXSLT


Saxon

Clibrary(pluse.g.fsm.hand

fsm.c)

BasicConcepts• MDA:Standard forMDSD,reuseofarchitecture, toolsandgenerators

– metamodelspecifiedusingUMLprofile– genericgeneratorsforeachplatform(J2EE,CORBA,…)

• PIM:Platform-Independent Model• PSM:Platform-SpecificModel

– generatedfromPIMviamodel-to-modeltransform– precursortogeneratedcode


Architecture-CentricMDSD


Modeling


Modelingwithxtext

DSLprogram(e.g.,specificGUIorstatemachine)

xtext grammar(ormaybeBNF)

anything,e.g.statemachines

xtext grammar(orEMF)

xtextgrammar

xtextlanguage

namereferences[…],stuffchecked

byxtend,…

whatthegeneratedcodedoes


anything

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Modelingstatemachines withXML+XSLT

XMLdocuments(cookinghood,…)

Statemachinegrammarschema

event-basedreactivesystems

Statemachine XMLschema

XML

XMLSchema

“onlyonehandlerperstateforeach

event”,…

whatthestatechart doeswhenaneventarrives


Statemachinespecificationlanguage

Transformations


Transformationsforstatemachineswithxtext

Machine.javaState.java

“howtogeneratecodeforstatetransition”,. . .

Javacodeimplementingmain

hood.sm2statemachine.xtext

gen_machine.xtend

hood_machine.java,…statemachine

implementedinJava whatthestatemachine doesSWC UlrikSchultz ,MMMI 21

(doable,butnotreallysupported)

TransformationsforstatemachineswithXML+XSLT

fsm.hfsm.c

“howtogeneratecodeforentryandexitactions

Ccodeimplementingactions

hood.xml,…machine.xsd

gen_machine.xsl,…

hood_machine.c,…statemachine

implementedinC whatthestatechart partofthestatemachine doesSWC UlrikSchultz ,MMMI 22

machine2enum.xsl,…

MDSDversusDSLsetc?

• MDSD:industry-approachtoDSLs– heavyontools,focusonUML-basedmodelsandgraphical(UML-like)syntax

–model-centricapproachusefulforlong-livingartifacts

• Case-in-point(s):– eclipseecore,Matlab/Simulink,Esterel SCADE,...– Robotics:DSLRobworkshop,largenumberofMDSD-basedcontributionsatICRASDIRworkshop


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