stepメソッドの展開

StepMethod.groovy

import org.codehaus.groovy.runtime.*

println  "オリジナル"
1.step(5,1) {print "$it "}
println ""

println "AST Browser 上"
1.step(5, 1, {this.print("$it ")})
println ""

println "DefaultGroovyMethods上"
DefaultGroovyMethods.step(1,5,1,{this.print "$it "})
println ""


//DefaultGroovyMethods からコピペと修正
Integer.metaClass.myStep {to, stepNumber, closure ->
    if (stepNumber > 0 && to > delegate) {
        (delegate..to-1).each(){ closure.call(it) }
    } else if (stepNumber < 0 && to < delegate) {
        (delegate..to+1).each(){ closure.call(it) }
    } else if(delegate != to)
        throw new GroovyRuntimeException("Infinite loop in " + delegate + ".step(" + to + ", " + stepNumber + ")")

}

def p ={print "$it "}
println "myStep ++"
1.myStep(5, 1, p)
println ""

println "myStep --"
5.myStep(1, -1, p)
println ""