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Eclipse Command Language
Bartosz Czerwiński
Cracow, Poland
Eclipse Day 2012, September 13
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Agenda
DSL
Scripting in Eclipse
ECL
–Core Concepts
–Architecture
–Applicability
–Future
Live Demo
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DSL
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Domain Specific Language
Most languages are general purpouse languages
Language Oriented Programming *
Domain-Specific Language (noun): a computer programming language of limited expressiveness focused on a particular domain *
Why do we need DSLs?
* Martin Fowler
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Types of DSLs
Internal (Embedded) – a particular idiom of writing a code in a host language
– Fluent Interfaces (Method Chaining)
– Flexible Syntax
–Method Missing
– Reflection (Annotations)
External – a separate language or a set of resources that facilitate the way of how a user is interacting with its environment within a particular domain
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Scripting in Eclipse Platform
EclipseShell
– http://eclipse-shell.sourceforge.net/
Eclipse Monkey
– Task automation and scripting, API exploration
– Based on Groovy Monkey Project
– http://www.eclipse.org/proposals/eclipse-monkey/
Eclipse Glimmer
– JRuby DSL for developing user interfaces
– http://www.eclipse.org/proposals/glimmer/
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ECL
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Eclipse Command Language
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echo „Hello World”
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Eclipse Command Language
Scripting and Automation Framework
Easily Extensible & Flexible
Command-oriented
Distributed
Q7 Platform scripting language
Entirely open-source
Introduced by Xored Software at EclipseCon 2008
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Core concepts
Model Driven Engineering
Functional Programming
REST
SOA
TCL
Microsoft® PowerShell™
Unix pipes
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Eclipse Modeling Framework Meta description of domain-specific model
Commands
Pipes
Script-lets
Eclipse Extension Points
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What’s under the hood?
Actual implementation of domain-specific logic
Provide means of communication between commands
Abstraction layer above commands, pipes (DSL specific)
Effectively associate Scriptlets with commands
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Scriptlet
An independent unit (Actor)
Stateless
Pipes are (conceptually) immutable
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list-plugins sort-by EMF Objects
Scriptlet
ListPluginsService SortByService
Command
Pipe
Eclip
se
Exte
nsio
n P
oin
ts
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Scriptlet c.d.
Domain Model
Distributed communication
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S
S
S
S
S TCP/IP
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Desktop Applications Distributed Systems Web Applications
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Applicability
Scripting & Automation
Instrumentation
Productivity
Issue Tracking
Issue Investigation
DSL Toolkits
Scripting & Automation
Mash-ups
Scripting & Automation
Remote Control
Remote Support
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Demo 1
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Telnet Console
Core features
Interacting remotely with Eclipse UI
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Demo 2
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Q7
Functional and UI testing platform
Handcrafted for Eclipse
Runtime Intelligence
State Management
Utilizes ECL as its core scripting language
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Future
Comprehensive DSL orchestration
Truly distributed
Code Injection
ECL core in other languages (Python, Scala, Ruby, ...) and their interoperability
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... | get-dom-nodes „a” | foreach js:{set-attr target „_top”}
... | get-list | script python:{sorted( $_, key=itemgetter(1) )}
get-data-sets | host1:remove-duplicates \ | host2:get-graphviz-layout twopi
get-data-set calls | get-node –query „self.duration < 13”
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Thank you!
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Special thanks to Andrey Platov and Ivan Inozemtsev
from Xored Software Inc.
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Resources
Sources and Extenstions
– https://github.com/xored/ecl/
– https://github.com/xored/q7.extensions.ecl
API (http://download.xored.com/q7/docs/ecl-api/1.2.4.html)
New Command Guide (http://help.xored.com/display/ECL/New+Command+Guide)
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