我正在测试使我的 dsl Jvm 兼容的想法,并且我想测试扩展 Xbase 和使用解释器的可能性。我试图制作一个与解释器一起使用的最小测试项目,但我遇到了运行时错误。我想我了解适应 Xbase 的一般概念,但不确定解释器的设置/入口点如何,并且找不到有关我遇到的错误或如何解决的任何信息。以下是我的情况的相关文件:
文本.xtext:
import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
import "http://www.eclipse.org/xtext/common/JavaVMTypes" as types
Program returns Program:
{Program}
'program' name=ID '{'
variables=Var_Section?
run=XExpression?
'}'
;
Var_Section returns VarSection:
{VarSection}
'variables' '{'
decls+=XVariableDeclaration+
'}'
;
@Override // Change syntax
XVariableDeclaration returns xbase::XVariableDeclaration:
type=JvmTypeReference name=ID '=' right=XLiteral ';'
;
@Override // Do not allow declarations outside of variable region
XExpressionOrVarDeclaration returns xbase::XExpression:
XExpression;
TestJvmModelInferrer:
def dispatch void infer(Program element, IJvmDeclaredTypeAcceptor acceptor, boolean isPreIndexingPhase) {
acceptor.accept(element.toClass(element.fullyQualifiedName)) [
documentation = element.documentation
if (element.variables !== null) {
for (decl : element.variables.decls) {
members += decl.toField(decl.name, decl.type) [
static = true
initializer = decl.right
visibility = JvmVisibility.PUBLIC
]
}
}
if (element.run !== null) {
members += element.run.toMethod('main', typeRef(Void::TYPE)) [
parameters += element.run.toParameter("args", typeRef(String).addArrayTypeDimension)
visibility = JvmVisibility.PUBLIC
static = true
body = element.run
]
}
]
}
测试用例:
@Inject ParseHelper<Program> parseHelper
@Inject extension ValidationTestHelper
@Inject XbaseInterpreter interpreter
@Test
def void basicInterpret() {
val result = parseHelper.parse('''
program program1 {
variables {
int var1 = 0;
double var2 = 3.4;
}
var1 = 13
}
''')
result.assertNoErrors
var interpretResult = interpreter.evaluate(result.run)
println(interpretResult.result)
部分堆栈跟踪:
java.lang.IllegalStateException: Could not access field: program1.var1 on instance: null
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._assignValueTo(XbaseInterpreter.java:1262)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.assignValueTo(XbaseInterpreter.java:1221)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:1213)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:216)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:190)
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:180)