Exercise 3 - Implementation

Base Transformation

Transformation class containing the MT definition. All rules are defined in the ruleStore().

package flowchartToHtmlExamples
import static yamtl.dsl.Rule.*
import org.eclipse.emf.ecore.EPackage
import yamtl.core.YAMTLModule
import yamtl.groovy.YAMTLGroovyExtensions
import yamtl.groovy.YAMTLGroovyExtensions_dynamicEMF

class Example3 extends YAMTLModule {
    public Example3(EPackage flowchartPk, EPackage htmlPk) {
        YAMTLGroovyExtensions_dynamicEMF.init(this)

        header().in("in", flowchartPk).out("out", htmlPk)

        ruleStore([
            //This parent rule is abstract, so it will not be applied directly
            //but it can be executed by its children
            rule('Flowchart2H1')
                //TODO: Implement the parent rule here

            //This child rule inherits from the previous one
            rule('Subflow2H1')
                //TODO: Implement the child rule here

        ])

    }
}

Solution

The correct transformation definition for this problem is:

package flowchartToHtmlExamples
import static yamtl.dsl.Rule.*
import org.eclipse.emf.ecore.EPackage
import yamtl.core.YAMTLModule
import yamtl.groovy.YAMTLGroovyExtensions
import yamtl.groovy.YAMTLGroovyExtensions_dynamicEMF

class Example3 extends YAMTLModule {
    public Example3(EPackage flowchartPk, EPackage htmlPk) {
        YAMTLGroovyExtensions_dynamicEMF.init(this)

        header().in("in", flowchartPk).out("out", htmlPk)

        ruleStore([
            //This parent rule is abstract, so it will not be applied directly
            //but it can be executed by its children
            rule('Flowchart2H1')
                .isAbstract()
                .in("f", flowchartPk.Flowchart)
                .out("h1", htmlPk.H1, {
                    h1.value = "Flowchart " + f.name
                }),

            //This child rule inherits from the previous one
            rule('Subflow2H1')
                .inheritsFrom(['Flowchart2H1'])
                .in("f", flowchartPk.Subflow)
                .out("h1", htmlPk.H1, {
                    //r.h.s h1.value is inherited from the parent rule
                    //'e' object is passed to the parent rule to calculate h1.value
                    h1.value = "Subflow " + h1.value
                })
        ])

    }
}

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Last update: October 13, 2023