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Controlling generator behavior with parameters [message #1790240]

Thu, 07 June 2018 10:56

Alexandros Karypidis

Messages: 104
Registered: March 2010

Senior Member

Hi,

I would like to provide a set of parameters that control various aspects of my generator (e.g. tab width to give an example). How does one communicate outside information to the generator?

1) Looking at AbstractGenerator I see that there is an "IGeneratorContext context" argument but that only gives access to a cancellation request indicator to allow you to fast-exit, so it's not of much use. I would want something where I can pass some opaque (to xtext) data that my generator knows how to interpret.

2) I will need to allow parameters to be set via the maven plugin. The documentation I have found here, does not list what other options I can pass as configuration. Does xtext-maven-plugin have a complete reference page with all options? Is there an option where I could define some string that is opaquely passed to the language generator for interpretation?

Thanks!
Alex

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Re: Controlling generator behavior with parameters [message #1790241 is a reply to message #1790240]

Thu, 07 June 2018 11:02

Christian Dietrich

Messages: 12391
Registered: July 2009

Senior Member

(1) usually such things are done via preferences inside eclipse. or a composent that reeads prefs in eclipse and has another binding in standalone mode that reads from somewhere else.
(2) no there is no docs. you need to read the source ocde. but i am not aware of anything beeing there to support this.

Need professional support for Xtext, Xpand, EMF?
Go to: https://xtext.itemis.com
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Controlling generator behavior with parameters [message #1790243 is a reply to message #1790241]

Thu, 07 June 2018 11:09

Alexandros Karypidis

Messages: 104
Registered: March 2010

Senior Member

Thanks for this info.

So, (1) would mean I can only do this in the IDE which is not what I am after. I will download (2) to have a look.

Even if I were to modify the maven plugin to be able to define such a string, it'd need to the generator, meaning xtext runtime needs to be involved.

I guess a quick hack would be to set a system property that the generator looks at and avoid all this.

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Re: Controlling generator behavior with parameters [message #1790245 is a reply to message #1790243]

Thu, 07 June 2018 11:15

Christian Dietrich

Messages: 12391
Registered: July 2009

Senior Member

the aliternative would to have a service X (singleton) and inject it to the generator and fill it from the maven plugin

Need professional support for Xtext, Xpand, EMF?
Go to: https://xtext.itemis.com
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Controlling generator behavior with parameters [message #1790299 is a reply to message #1790245]

Fri, 08 June 2018 07:16

Uli Merkel

Messages: 236
Registered: June 2013

Senior Member

I just extended my grammar as:

Model: {Model}
('generator_options' options+=Option? (',' options+=Option)*)+;
Option: name=ID ('=' value=STRING)?;

In the Generator, I added some Utilities:

// *** advanced Option utilities
static Map<String, String> myOptions = new TreeMap<String, String>(String.CASE_INSENSITIVE_ORDER);

def loadMyOptions(EList<Option> options) {
myOptions.clear
for (Option option : options) {
myOptions.put(option.name, option.value ?: "")
}
return ("")
}

def getMyOption(String key) {
return myOptions.get(key) ?: ""
}

def boolean isMyOption(String key) {
return myOptions.containsKey(key)
}

def boolean isMyOption(String key, String compareValue) {
compareValue.equals(getMyOption(key))
}

def boolean isMyOptionIgnoreCase(String key, String compareValue) {
compareValue.equalsIgnoreCase(getMyOption(key))
}
...
def universalPreparation(Model sm) {
loadMyOptions(sm.options)
return ""
}

and activated this with:

override void doGenerate(Resource resource, IFileSystemAccess fsa) {
var String scriptFileName = resource.getURI().lastSegment.toString();
scriptfileName = scriptFileName;
outFileBase = scriptFileName.substring(0, scriptFileName.lastIndexOf("."));
universalPreparation(resource.contents.head as Model)
fsa.generateFile('DEMO.umevis0.graphml',genDemoVisout())
....

HIH, Uli

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