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XText entry rule [message #1057846]

Thu, 09 May 2013 09:53

Alfredo Motta

Messages: 41
Registered: June 2012

Member

Hello everybody,

in XText the first rule of the grammar is the entry rule.
When I use the generated parser in my standalone application I do the
following:

   Resource resource = 
resourceSet.createResource(URI.createURI("file:/example.mydsl"));
   InputStream in = new ByteArrayInputStream(inputString.getBytes());
   resource.load(in, resourceSet.getLoadOptions());
   Model model = (Model) resource.getContents().get(0);

where "Model" is the first rule of my grammar.

I am wondering if it is possible to obtain a parser where the entry rule
is any of the other rules defined in the grammar.
In other words I am wondering if it is possible to know if I can write
something like

   Resource resource = 
resourceSet.createResource(URI.createURI("file:/example.mydsl"));
   InputStream in = new ByteArrayInputStream(inputString.getBytes());
   resource.load(in, resourceSet.getLoadOptions());
   RuleOfChoice parsedRule = (RuleOfChoice) resource.getContents().get(0);

where "RuleOfChoice" is one of the rules defined in mydsl, but it is not
the entry rule.

Thank you for your help

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Re: XText entry rule [message #1057849 is a reply to message #1057846]

Thu, 09 May 2013 09:55

Alfredo Motta

Messages: 41
Registered: June 2012

Member

On 05/09/2013 11:53 AM, Alfredo Motta wrote:
> In other words I am wondering if it is possible to know if I can write
> something like

EDIT:
In other words I am wondering if it is possible to write something like:

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Re: XText entry rule [message #1057976 is a reply to message #1057849]

Fri, 10 May 2013 09:30

Alfredo Motta

Messages: 41
Registered: June 2012

Member

I will try to explain myself again.

Does XText produce additional parsers apart from the standard one that
starts parsing the input using the entry rule?

In other words I would like to write something like "parse this input
and use the following rule of the grammar as the entry point"

Thank you

On 05/09/2013 11:55 AM, Alfredo Motta wrote:
> On 05/09/2013 11:53 AM, Alfredo Motta wrote:
>> In other words I am wondering if it is possible to know if I can write
>> something like
>
> EDIT:
> In other words I am wondering if it is possible to write something like:

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Re: XText entry rule [message #1057988 is a reply to message #1057976]

Fri, 10 May 2013 10:52

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

did you have a look at the Parser? It has a method parse(ParserRule rule, Reader reader). The parser rule you could obtain from the GrammarAccess of your language.

Alex

Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext@itemis.de

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