Migrate extensions to AsciidoctorJ 1.6.0-alpha.3

[robertpanzer]

Moves the Groovy DSL to work on top of AsciidoctorJ 1.6.0-alpha.3

[robertpanzer]

Also tested with the current Gradle plugin with this build file and it seems to work fine: (Rendering the test document from the AsciidoctorGroovyDSLSpec.groovy

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.3'
    }
}

apply plugin: 'org.asciidoctor.convert'

asciidoctorj {
    version = '1.6.0-alpha.3'
    groovyDslVersion = '1.6.0-SNAPSHOT'
}

group 'org.asciidoctor'
version '1.0-SNAPSHOT'

repositories {
    jcenter ()
    mavenLocal()
}

asciidoctor {
    extensions {
        block(name: 'BIG', contexts: [':paragraph']) {
            parent, reader, attributes ->
                def upperLines = reader.readLines()
                        .collect {it.toUpperCase()}
                        .inject('') {a, b -> a + '\n' + b}

                createBlock(parent, 'paragraph', [upperLines], attributes, [:])
        }
        block('small') {
            parent, reader, attributes ->
                def lowerLines = reader.readLines()
                        .collect {it.toLowerCase()}
                        .inject('') {a, b -> a + '\n' + b}

                createBlock(parent, 'paragraph', [lowerLines], attributes, [:])
        }
        blockmacro('capitalize') {
            parent, target, attributes ->
                def capitalLines = target.toLowerCase()
                        .tokenize('_')
                        .collect { it.capitalize() }
                        .join(' ')
                createBlock(parent, 'pass', [capitalLines], attributes)
        }
        inline_macro('man') {
            parent, target, attributes ->
                def options = ["type": ":link", "target": target + ".html"]
                createPhraseNode(parent, "anchor", target, attributes, options).convert()
        }
    }
}