如何在Xtext中嵌入XBase表達式DSL

我正在寫一個簡單的小型DSL來指定對消息的約束，並且一直試圖將XBase表達式嵌入到語言中一段時間沒有成功。如何在Xtext中嵌入XBase表達式DSL

的語法如下：

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)? 
;

當試圖解析文件如：

通過約束有效載荷SimulationSessionEvents元矩陣...

我不能讓它爲......工作... =任何類型的算術表達式，儘管它適用於... =循環或表達式，甚至只是一個數字。只要我做'-5'或'4-5'之類的東西，它就表示Couldn't resolve reference to JvmIdentifiableElement '-'，即使Xbase.xtext語法看起來像它允許這些表達式。

我不認爲我錯過了任何Jars，因爲它不會抱怨當我運行我的工作流程，但只有當試圖解析輸入文件。

任何幫助將不勝感激。

編輯：該項目的構建路徑如下：

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

來源

2012-06-26 Marcus Mathioudakis