Xtext headless mode code generation

Xtext

Xtext is a tool used to build DSL in eclipse. It is very convenient to use. Besides developing DSL, it also supports eclipse syntax highlighting, error prompting, and other functions. Http://www.eclipse.org/Xtext/index.html

It is recommended that you read the first several tutorial in the official document to have a rough understanding of the use of xtext. Http://www.eclipse.org/Xtext/documentation.html#FirstFiveMinutes

Code Generation In headless Mode

Generally, xtext-based DSL projects are written in the IDE environment. In this way, although it is convenient for our editing, IDE is clumsy and not easy to automate in project construction and other application scenarios. I suppose you have read the example in the xtext document. Let's take a look at how to generate the corresponding Java code of DSL through command line.

1. Create an xtext Project

2. Write the project name and the corresponding DSL suffix name

3. Run mwe2 to generate a bunch of messy things

4. Download anlr. At this time, you will be prompted to download anlr on the console, enter y, and press Enter.

5. Compile DSL generator. Because it is convenient to use it here, you can directly use the built-in templates.

6.write mainnames, which are used to receive a DSL file and generate greetings.txt

Package org. Kiwi. Text. Hello. generator;

Import java. util. List;

Import org. Eclipse. EMF. Common. util. Uri;

Import org. Eclipse. EMF. ecore. Resource. resource;

Import org. Eclipse. EMF. ecore. Resource. resourceset;

Import org. Eclipse. xtext. generator. igenerator;

Import org. Eclipse. xtext. generator. javaiofilesystemaccess;

Import org. Eclipse. xtext. util. cancelindicator;

Import org. Eclipse. xtext. validation. checkmode;

Import org. Eclipse. xtext. validation. iresourcevalidator;

Import org. Eclipse. xtext. validation. issue;

Import org. Kiwi. Text. Hello. mydslstandalonesetupgenerated;

Import com. Google. Inject. Inject;

Import com. Google. Inject. injector;

Import com. Google. Inject. provider;

Publicclass main {

Publicstatic void main (string [] ARGs ){

If (ARGs. Length = 0 ){

System. Err. println ("aborting: no path to EMF resource provided! ");

Return;

}

Injector injector = new mydslstandalonesetupgenerated (). createinjectoranddoemfregistration ();

Main main = injector. getinstance (main. Class );

Main. rungenerator (ARGs [0]);

}

@ Inject

Private provider <resourceset> resourcesetprovider;

@ Inject

Private iresourcevalidatorvalidator;

@ Inject

Private igeneratorgenerator;

@ Inject

Private javaiofilesystemaccessfileaccess;

Protectedvoid rungenerator (string ){

// Load the resource

Resourceset set = resourcesetprovider. Get ();

Resource resource = set. getresource (URI. createuri (string), true );

// Validate the resource

List <issue> List = validator. Validate (resource, checkmode. All, cancelindicator. nullimpl );

If (! List. isempty ()){

For (issue: List ){

System. Err. println (issue );

}

Return;

}

// Configure and start the generator

Fileaccess. setoutputpath (".");

Generator. dogenerate (resource, fileaccess );

System. Out. println ("code generation finished .");

}

}

7. Configure Java headless

8. Export runnable jar

Note: select "package required libraries into generted jar"

8. Verify

Create the file hello. mydsl with the following content:

Hello Jack!
Hello Lucy!
Hello Nigel!

Execute Code Generation:

The Java-jar hello-dsl.jar hello. mydsl

To greetings.txt:

People to greet: Jack, Lucy, Nigel

More

Here we only show how to use the headless mode, but not how to generate Java code. Refer to the xtext official document on how to generate the JVM language.

References

Http://xtextcasts.org/episodes/12-building-with-ant? View = comments # comment_32

Xtext headless mode code generation