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Adding built-in types to the domain model example [message #848415]

Wed, 18 April 2012 07:47

Louis van der Stam

Messages: 2
Registered: April 2012

Junior Member

Hi,

I'm quite new to xText. Currently I'm working my way through the tutorial and making modifications to examine different behavior.

With the domain model example, I have been trying to add built-in primitive types (string, int, boolean) instead of requiring them to be defined through the "DataType" rule. I want to remove the "DataType" rule from the model.

My attempts have been unsuccessful thus far. Where my main problem seems to be to get the build-in types recognised as a subtype of "Type" and get the editor to show the built-in types as an alternative.

So my question is what approaches are there to achieve the addition of built-in types to the domain model example and if there are multiple what would be the preffered option. Examples of the model modification and/or code would be appriciated.

Regards,

Louis

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Re: Adding built-in types to the domain model example [message #848455 is a reply to message #848415]

Wed, 18 April 2012 08:33

Holger Schill

Messages: 75
Registered: July 2009

Member

Hi Louis,

if I understood you right you would like to reference JavaTypes? There
is a common way
http://www.eclipse.org/Xtext/documentation/2_0_0/199a-jvmtypes.php.

As alternative you could extens xbase
http://www.eclipse.org/Xtext/documentation/2_0_0/199e-xbase-language-reference.php.

The shipped DomainModelExample since Xtext 2.0 extends xbase so you
might have a look here.

Cheers,

Holger

--
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Re: Adding built-in types to the domain model example [message #848487 is a reply to message #848455]

Wed, 18 April 2012 09:18

Louis van der Stam

Messages: 2
Registered: April 2012

Junior Member

Hello Holger,

thank you for your response.

- if I understood you right you would like to reference JavaTypes?
The types I gave were just examples and most likely they would be closely resembling the primitive types in many programming languages. So yes they are JavaTypes, but no I'm not trying to reference all JavaTypes.

- There is a common way [link not allowed] www.eclipse.org/Xtext/documentation/2_0_0/199a-jvmtypes.php.
For me the link doesn't work, I guess you are pointing me to the xText documentation.

- As alternative you could extens xbase [link not allowed] www.eclipse.org/Xtext/documentation/2_0_0/199e-xbase-language-reference.php.
For me the link doesn't work, I guess you are pointing me to the xText documentation.

- The shipped DomainModelExample since Xtext 2.0 extends xbase so you might have a look here.
I haven't worked through the tutorials completely... But I'have skipped ahead and looked at the shipped example. With the example, when I create a new property, I get a huge list of JAVA types when I hit CTRL-<space>. I need only the primitive language types and the Entities defined in the model to be available as the type for an entity. So it seems to me that the java type mapping is a bit to much for me.

Can you suggest another way to achieve the built-in types without importing the all JavaTypes?

Regards,

Louis

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Re: Adding built-in types to the domain model example [message #848682 is a reply to message #848487]

Wed, 18 April 2012 13:27

Holger Schill

Messages: 75
Registered: July 2009

Member

Hello Luis,

remove the dots at the end of the URLs and the links should work.

If you have the need to have a real reference to the primitive types
www.eclipse.org/Xtext/documentation/2_0_0/199a-jvmtypes.php should be
the way to go. Just filter for types in java.lang or something like this
in the scopeProvider.
If there is no need for you to have a real reference you could establish
a small grammar to define types and reference them in the
domainModelExample with a crossreference and ship the file with the
defined types as library with your language.

Cheers,
Holger

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Re: Adding built-in types to the domain model example [message #849919 is a reply to message #848682]

Thu, 19 April 2012 15:22

Mariusz Mariusz

Messages: 17
Registered: April 2012

Junior Member

I have similar problem: I would like to add my custom/built-in/atomic types to the default tutorial grammar:

Domainmodel:
  (elements += AbstractElement)*
;

PackageDeclaration:
  'package' name = QualifiedName '{'
    (elements += AbstractElement)*
  '}'
;

AbstractElement:
  PackageDeclaration | Type | Import
;

QualifiedName:
  ID ('.' ID)*
;

Import:
  'import' importedNamespace = QualifiedNameWithWildcard
;
  
QualifiedNameWithWildcard:
  QualifiedName '.*'?
;
  
Type:
  DataType | Entity
;
  
DataType:
  'datatype' name=ID
;
 
Entity:
  'entity' name = ID 
              ('extends' superType = [Entity | QualifiedName])?
  '{'
    (features += Feature)*
  '}'
;
 
Feature:
  (many ?= 'many')? name = ID ':' type = [Type | QualifiedName]
;

I have tried many approaches but still failed. For instance can someone explain why the following modification does not work (the generated editor error message: "extraneous input 'bool' expecting RULE_ID"):

Type:
  (DataType | Entity | PrimitiveType)
;

PrimitiveType:
	{PrimitiveType}('integer'|'float'|'string'|'bool')
;

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Re: Adding built-in types to the domain model example [message #850681 is a reply to message #849919]

Fri, 20 April 2012 08:24

Mariusz Mariusz

Messages: 17
Registered: April 2012

Junior Member

Finally I found the solution. Basically the problem was caused by a wrong cross-referencing to [Type]. Now a few new rules have been introduced and the cross-referencing is performed outside the Feature rule (this post was helpful: www.eclipse.org/forums/index.php/m/523812/).

Here is the modified Xtext tutorial with added built-in/atomic/custom types:

Domainmodel:
  (elements += AbstractElement)*
;

PackageDeclaration:
  'package' name = QualifiedName '{'
    (elements += AbstractElement)*
  '}'
;

AbstractElement:
  PackageDeclaration | Type | Import
;

QualifiedName:
  ID ('.' ID)*
;

Import:
  'import' importedNamespace = QualifiedNameWithWildcard
;
  
QualifiedNameWithWildcard:
  QualifiedName '.*'?
;
  
Type:
  DataType | Entity
;

TypeRef :
EntityRef | BuiltInRef;

EntityRef :
entity=[Entity | QualifiedName];

BuiltInRef :
name=('integer'|'float'|'string'|'bool'|'date') 
;
  
DataType:
  'datatype' name=ID
;
 
Entity:
  'entity' name = ID 
              ('extends' superType = [Entity | QualifiedName])?
  '{'
    (features += Feature)*
  '}'
;
 
Feature:
  (many ?= 'many')? name = ID ':' type = TypeRef
;

Moderator: I think you can mark this post as [SOLVED]

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