Groovy for Domain-specific Languages - Second Edition

Chapter 10

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Now that we understand the building mechanism, it is a trivial matter to change our
LogBuilder script to create some actual markup. Here, with a few modifications,
we can turn our script into PoorMansTagBuilder20:

class PoorMansTagBuilder20 extends BuilderSupport {

def indent = 0

def createNode(name){

indent.times {print " "}

println "<${name}>"

indent++

return name

}

def createNode(name, value){

indent.times {print " "}

println "<${name}>" + value

indent++

return name

}

def createNode(name, Map attributes){

indent.times {print " "}

print "<${name} "

print attributes.collect {

"${it.key}='${it.value}'"

}.join(' ')

println ">"

indent++

return name

}

def createNode(name, Map attributes, value){

indent.times {print " "}

print "<${name} "

print attributes.collect {

"${it.key}='${it.value}'"

}.join(' ')

println ">" + value

indent++

return name

}

void setParent(parent, child){

// Don't care since we are just streaming to output

}

void nodeCompleted(parent, node) {

indent--