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Xtext newbie - ID with array declaration [message #1764364]

Mon, 29 May 2017 08:43

Anton Hughes

Messages: 66
Registered: January 2013

Member

Hello

Im trying to create a dsl that is essentially identical to a simple c++ header file.

I am unsure how to make the following, within the xtext dsl:

   char              myChar[32];

Thanks

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Re: Xtext newbie - ID with array declaration [message #1764365 is a reply to message #1764364]

Mon, 29 May 2017 08:46

Christian Dietrich

Messages: 14735
Registered: July 2009

Senior Member

hmmm am not sure if i can follow you

Decl: type=Type name=ID ('[' dim=INT']')?;
enum Type: char | int32| ...;

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: Xtext newbie - ID with array declaration [message #1764367 is a reply to message #1764365]

Mon, 29 May 2017 08:56

Anton Hughes

Messages: 66
Registered: January 2013

Member

Hi Christian

Apologies for the lack of details.

Dsl
My dsl, currently, looks like this:

struct MyStruct{
	
	int myInt; 
	unsigned int myUnsiggnedInt;
   __time32_t        timestamp;                  
   char              myChar[32];             
	
};

Xtext
And my xtext file is:

grammar mydomain.Mydsl with org.eclipse.xtext.common.Terminals

generate Mydsl "http://mydomain/mydsl"

Model:
	structs+=struct*;

struct:
	'struct' name=ID  '{'
		attributes+=Attribute*
	'};';

Attribute:
	type=AttributeType name=ID ';';

AttributeType:
	elementType=ElementType (array?='[' (length=INT)? ']')?;

ElementType:
	BasicType | StructType;
	


BasicType:
	typeName=('string' | 'int' | 'boolean'  | 'char' | '__time32_t' |  'unsigned int');

StructType:
	struct=[struct];

Problem
The dsl is currently unable to parse the following line:

   char              myChar[32];

[Updated on: Mon, 29 May 2017 08:57]

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Re: Xtext newbie - ID with array declaration [message #1764368 is a reply to message #1764367]

Mon, 29 May 2017 09:08

Christian Dietrich

Messages: 14735
Registered: July 2009

Senior Member

yes but you put the array to the type, not the name (in the grammar)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

[Updated on: Mon, 29 May 2017 09:09]

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Re: Xtext newbie - ID with array declaration [message #1764372 is a reply to message #1764368]

Mon, 29 May 2017 09:35

Anton Hughes

Messages: 66
Registered: January 2013

Member

I have tried your suggestion of:

BasicType:
	typeName=('string' | 'int' | 'boolean' | 'double' | 'char' | '__time32_t' |  'unsigned int');
	
Decl: type=Type name=ID ('[' dim=INT']')?;
enum Type: char | int32;

But I am still getting an error when I try having the following in the dsl:

char              myChar[32];

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Re: Xtext newbie - ID with array declaration [message #1764375 is a reply to message #1764372]

Mon, 29 May 2017 09:41

Christian Dietrich

Messages: 14735
Registered: July 2009

Senior Member

thats not what i meant

Attribute:
	type=AttributeType name=ID  (array?='[' (length=INT)? ']')? ';';

AttributeType:
	elementType=ElementType (array?='[' (length=INT)? ']')?;

ElementType:
	BasicType | StructType;
	


BasicType:
	typeName=('string' | 'int' | 'boolean'  | 'char' | '__time32_t' | UINT);
	
UINT: 'unsigned' 'int';

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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