DSLs in Groovy Say what you mean, Mean what you say Scott Davis - - PowerPoint PPT Presentation

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DSLs in Groovy Say what you mean, Mean what you say Scott Davis - - PowerPoint PPT Presentation

Jun 19, 2023 216 likes •682 views

DSLs in Groovy Say what you mean, Mean what you say Scott Davis Scott Davis What is a Domain Specific Language? Domain Language DSL: a specific tool for a specific job SQL select title, author from book where isbn = abc123;

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Scott Davis

DSLs in Groovy

Say what you mean, Mean what you say

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Scott Davis

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What is a Domain Specific Language?

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Domain

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Language

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DSL: a specific tool for a specific job

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SQL

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select title, author from book where isbn = ‘abc123’;

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<target name="compile" description="Compiles the Java code"> <mkdir dir="${build.dir}" /> <mkdir dir="${classes.dir}" /> <javac srcdir="${source.dir}" destdir="${classes.dir}" debug="on" deprecation="on"> <classpath refid="compile.classpath"/> </javac> <copy todir="${classes.dir}"> <fileset dir="${source.dir}"> <include name="**/*.properties" /> <include name="**/*.xml" /> </fileset> </copy> </target>

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Internal

  • r

External?

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Simplicity

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* Cornstarch * Corn flour * Corn syrup solids * Mono and diglycerides * Soy lecithin * Polysorbate 60 * Dextrin * Calcium caseinate * Sodium stearol lactylate * Wheat gluten * Calcium sulfate * Natural and artificial flavors * Caramel color * Sorbic acid (to retain freshness) * Artificial color (yellow 5, red 40)

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select * from books;

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What is Groovy?

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Groovy is a DSL for Java

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public class HelloJava{ public static void main(String[] args){ System.out.println("Hello Java"); } } println “Hello Groovy”

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A DSL for Installation

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#!/usr/bin/env groovy if(args){ def project = args[0] println "Installing ${project}..." "cp jboss.tar.gz /install/jboss".execute() println "Finished installing ${project}..." } else{ println """USAGE: install jboss [from src/dir] [to dest/dir]""" }

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A DSL for Time

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Integer.metaClass.getHour = {-> delegate * 60 } Integer.metaClass.getMinutes = {-> delegate } println 1.hour + 30.minutes

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A DSL is a specific tool Internal or External To simplify the solution

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DSLs in Groovy

Say what you mean, Mean what you say

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Scott Davis

Questions? Thanks for your time.

scott@thirstyhead.com

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Photo Credits

http://commons.wikimedia.org/wiki/Image:John_Hill_and_John_Linthicum_shaking_hands.jpg http://commons.wikimedia.org/wiki/Image:Computer_keyboard.gif http://flickr.com/photos/lourdes_place/1384832252/sizes/l/ http://flickr.com/photos/lydian/2732579654/sizes/o/ http://commons.wikimedia.org/wiki/Image:Rosetta_Stone.JPG http://upload.wikimedia.org/wikipedia/commons/d/dc/Hammer-vertical.jpg http://upload.wikimedia.org/wikipedia/commons/7/74/Swiss_army_similar_knife(side).jpg http://sourcemaking.com/files/sm/images/hammer.jpg http://flickr.com/photos/cyron/97468482/ http://commons.wikimedia.org/wiki/Image:Furniture_installation_tools.jpg http://www.chiefhomeofficer.com/wp-content/uploads/2008/04/folders-image-courtesy- dpscsmdgov.jpg http://upload.wikimedia.org/wikipedia/commons/2/21/Cylinder.png http://commons.wikimedia.org/wiki/File:ParseTree.svg http://upload.wikimedia.org/wikipedia/commons/0/0d/XML_To_XML_Transformation.png http://flickr.com/photos/alternatewords/2292389441 http://en.wikipedia.org/wiki/Image:Hostess_twinkies.jpg http://commons.wikimedia.org/wiki/File:RelojDespertador.jpg