import javax.xml.parsers.SAXParserFactory
import org.xml.sax.helpers.DefaultHandler
import org.xml.sax.InputSource
import groovy.xml.MarkupBuilder

def getDSLString(File xml, Writer w, String indent = '  ') {
  def handler = new GroovyMarkupDSLHandler(w, indent)
  def reader = SAXParserFactory.newInstance().newSAXParser().xmlReader
  reader.contentHandler = handler
  reader.parse(new InputSource(xml.newInputStream()))
}

def s1 = new StringWriter()
getDSLString(new File('test1.xml'), s1)
def expected1 = '''\
root {
  a {
    b {
      c {
      }
    }
  }
}'''
assert expected1 == s1.toString()
// 逆変換(一旦DSLにしたものをMarkupした結果のXMLと元のXMLを比較)
assert new File('test1.xml').text == Eval.me("""
  def sw = new StringWriter()
  def xml = new groovy.xml.MarkupBuilder(sw)
  xml.doubleQuotes = true
  xml.${s1.toString()}
  sw.toString()
""")

def s2 = new StringWriter()
getDSLString(new File('test2.xml'), s2, ' '*4) // タブ=スペース*4
def expected2 = '''\
root {
    a(hoge: 'val1', fuga: 'val2') {
    }
    b {
    }
    c(hoge: 'val3') {
        d {
            mkp.yield('val4')
        }
        e {
            f(hoge: 'val5') {
                mkp.yield('ばりゅー６')
            }
        }
    }
}'''
assert expected2 == s2.toString()
// 逆変換(一旦DSLにしたものをMarkupした結果のXMLと元のXMLを比較)
assert new File('test2.xml').text == Eval.me("""
  def sw = new StringWriter()
  def xml = new groovy.xml.MarkupBuilder(sw)
  xml.doubleQuotes = true
  xml.${s2.toString()}
  sw.toString()
""")