I am writing a simple little DSL for specifying constraints on messages, and Have been trying without success for a while to embed XBase expressions into the language.
The Grammar looks like this:
grammar org.xtext.businessrules.BusinessRules with org.eclipse.xtext.xbase.Xbase
//import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
import "http://www.eclipse.org/xtext/common/JavaVMTypes" as jvmTypes
generate businessRules "http://www.xtext.org/businessrules/BusinessRules"
Start:
rules+=Constraint*;
Constraint:
{Constraint}
'FOR' 'PAYLOAD' payload=PAYLOAD 'ELEMENT' element=ID 'CONSTRAINED BY' constraint=XExpression;
PAYLOAD:
"SimulationSessionEvents"
|"stacons"
|"any"
;
Range:
'above' min=INT ('below' max=INT)?
|'below' max=INT ('above' min=INT)?
;
When trying to parse a file such as:
FOR PAYLOAD SimulationSessionEvents ELEMENT matrix CONSTRAINED BY …
I can’t get it to work for … = any kind of Arithmetic expression, although it works for …= loop or if expression, or even just a number. As soon as I do something like ‘-5’ or ‘4-5’ it says Couldn't resolve reference to JvmIdentifiableElement '-', even though the Xbase.xtext Grammar looks like it allows these expressions.
I don’t think I’m missing any Jars, as it doesn’t complain when I run the mwe workflow, but only when trying to parse the input file.
Any help would be much appreciated.
edit:
The buildpath for the project is the following:
C:\Program Files\eclipse\plugins\org.eclipse.xtext_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.ecore.xmi_2.7.0.v20120127-1122.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.ecore_2.7.0.v20120127-1122.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.common_2.7.0.v20120127-1122.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtext.util_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\com.google.guava_10.0.1.1.jar
C:\Program Files\eclipse\plugins\com.google.inject_3.0.0.no_aop.jar
C:\Program Files\eclipse\plugins\javax.inject_1.0.0.v20091030.jar
C:\Program Files\eclipse\plugins\org.antlr.runtime_3.2.0.v201101311130.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe.core_1.2.1.v201112070431.jar
C:\Program Files\eclipse\plugins\org.apache.commons.cli_1.2.0.v201105210650.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe2.runtime_2.2.0.v201112070431.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe.utils_1.2.1.v201112070431.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtext.xbase_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtext.common.types_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.apache.log4j_1.2.15.v201012070815.jar
C:\Program Files\eclipse\plugins\org.apache.commons.logging_1.0.4.v201101211617.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtext.generator_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtend_1.1.0.v201108020519.jar
C:\Program Files\eclipse\plugins\com.ibm.icu_4.4.2.v20110823.jar
C:\Program Files\eclipse\plugins\org.eclipse.xpand_1.1.0.v201108020519.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtend.typesystem.emf_1.0.1.v201108020519.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.codegen.ecore_2.7.0.v20120130-0943.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.codegen_2.6.0.v20120130-0943.jar
C:\Program Files\eclipse\plugins\de.itemis.xtext.antlr_2.0.0.v201108011202.jar
C:\Program Files\eclipse\plugins\org.antlr.generator_3.2.0.v201108011202.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe2.lib_2.2.0.v201112070431.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtext.xbase.lib_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.eclipse.xtend2.lib_2.2.1.v201112130541.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe2.launch_2.2.0.v201112071250.jar
C:\Program Files\eclipse\plugins\org.eclipse.emf.mwe2.language_2.2.0.v201112071250.jar
Problem fixed, it turns out you need to include the xbase.lib jar on the build path of the project that actually declares models of your DSL.