java - 从项目代码中遍历xtext ast

Question

我在 xtext 中有一个 dsl 语法，我在 eclipse 插件中使用它。在插件中，用户手动创建一个新文件(如 https://eclipse.org/Xtext/documentation/102_domainmodelwalkthrough.html 中的 blog.dmodel 文件)

在我的插件代码中，当用户右键单击 dmodel 文件时，他可以从右键单击菜单中选择一个选项，该选项会触发名为 traverseAST() 的方法该方法当前查找

    IWorkspaceRoot root = workspace.getRoot();
    IProject project = root.getProject(projectName);
    IFolder folder = project.getFolder(path);
    IFile file = folder.getFile(fileName);

我知道 IFile 不是我可以用来遍历 AST 的东西，所以我正在尝试以下方法

    @Inject
    static ResourceSet resourceSet;
    public traverseAST(){
        IWorkspaceRoot root = workspace.getRoot();
        IProject project = root.getProject(projectName);
        IFolder folder = project.getFolder(path);
        IFile file = folder.getFile(fileName);
        org.eclipse.emf.common.util.URI uri = org.eclipse.emf.common.util.URI.createPlatformResourceURI(file.getFullPath().toString(), true);
        ResourceSet set  = new ResourceSetImpl();
        Resource resource = set.createResource(uri);
        TreeIterator<Object> x1 = EcoreUtil.getAllContents(resource, true);
        TreeIterator<Object> x2 = EcoreUtil.getAllContents(resource, false);
}

我的资源是org.eclipse.xtext.linking.lazy.LazyLinkingResource@1230a38d uri='platform:/resource/demo/src/blog.dmodel'

但是 x1 和 x2 都是空的。

我做错了什么？

____编辑____根据 Christian Dietrich 的建议，我的代码现在是

    IWorkspaceRoot root = workspace.getRoot();
    IProject project = root.getProject(projectName);
    IFolder folder = project.getFolder(path);
    IFile file = folder.getFile(fileNameWithoutExtension + suffix);
    org.eclipse.emf.common.util.URI uri = org.eclipse.emf.common.util.URI.createPlatformResourceURI(file.getFullPath().toString(), true);
    IResourceSetProvider rs1 = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(uri).get(IResourceSetProvider.class);
    ResourceSet rs = rs1.get(project);
    Resource r = rs.getResource(uri, true);

uri 值为

platform:/resource/demo/src/blog.dmodel

rs1 是

org.eclipse.xtext.ui.resource.XtextResourceSetProvider@2faab150
FactoryProxy[key=Key[type=org.eclipse.xtext.resource.XtextResourceSet, annotation=[none]], provider=com.google.inject.internal.ConstructorBindingImpl$Factory@6185cb4d]

rs 是 org.eclipse.xtext.resource.SynchronizedXtextResourceSet@39fcefea resources=[org.eclipse.xtext.linking.lazy.LazyLinkingResource@25d48650 uri='platform:/resource/demo/src/blog.dmodel']

r 是

org.eclipse.xtext.linking.lazy.LazyLinkingResource@25d48650 uri='platform:/resource/demo/src/blog.dmodel'

但内容是[]

编辑2_

每个请求共享更多代码。

我的 Eclipse 菜单处理程序代码BaseMenuHandler.java 当用户单击下拉菜单中的选项时，将激活以下代码。这是 Eclipse 菜单中标准添加的选项 静态公共(public)类InsertEvents { @覆盖 公共(public)对象执行(ExecutionEvent事件)抛出ExecutionException { IWorkspace 工作空间 = ResourcesPlugin.getWorkspace(); IWorkbenchPage 页面 = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(); Traverse.traverseAST(页面，工作空间); }

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.eclipse.xtext.resource.IResourceServiceProvider;
import org.eclipse.xtext.ui.resource.IResourceSetProvider;
public class Traverse{
    public static void traverseAST(IWorkbenchPage page, IWorkspace workspace) {
        IFile ifile = getSelectedIFile();
        if (ifile != null) {
            String fileName = ifile.getName();
            String fileNameWithoutExtension = fileName.replace(ifile.getFileExtension().toString(), "");
            String projectName = ifile.getProject().getName();
            String path = ifile.getProjectRelativePath().toString().replace("/" + fileName, "");
            IWorkspaceRoot root = workspace.getRoot();
            IProject project = root.getProject(projectName);
            IFolder folder = project.getFolder(path);
            IFile file = folder.getFile(fileNameWithoutExtension + "dmodel");
            if (suffix.equals("dmodel")){
               String path1 = file.getFullPath().toString();
            org.eclipse.emf.common.util.URI uri = org.eclipse.emf.common.util.URI.createPlatformResourceURI(file.getFullPath().toString(), true);
            IResourceSetProvider rs1 = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(uri).get(IResourceSetProvider.class);
            ResourceSet rs = rs1.get(project);
            Resource r = rs.getResource(uri, true);
            TreeIterator<Object> x1 = EcoreUtil.getAllContents(r, true);
            TreeIterator<Object> x2 = EcoreUtil.getAllContents(r, false);

}


        }

blog.dmodel 代码是 15 分钟的教程，没有任何更改: https://eclipse.org/Xtext/documentation/102_domainmodelwalkthrough.html____编辑3____跟随我们的谈话我在 xtext 项目 (blog.mydsl) 下创建了 main

package blog.mydsl;

import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.example.domainmodel.DomainmodelStandaloneSetup;

import com.google.inject.Injector;

public class Main {

    public static void main(String[] args) {
        URI uri = URI.createURI("/Users/Desktop/demo.mydsl");
        Injector i = new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();
        ResourceSet rs = i.getInstance(ResourceSet.class);
        Resource r = rs.getResource(uri, true);
        TreeIterator<Object> x1 = EcoreUtil.getAllContents(r, true);
        while (x1.hasNext()) {
            System.out.println(x1.next());
        }
        TreeIterator<Object> x2 = EcoreUtil.getAllContents(r, false);
        while (x2.hasNext()) {
            System.out.println(x2.next());
        }
    }

}

这似乎有效。因为我没有做类似以下的事情 注入(inject)器 i = new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();在我的原始代码中，这应该是要走的路吗？我应该将插件代码移至 blog.mydsl src 文件夹吗？我应该查看 URI 吗？

Answer 1

以下内容应该有效。

@Inject
IResourceSetProvider resourceSetProvider;
...
URI uri = URI.createPlatformResourceURI(file.getFullPath().toString(), true);
ResourceSet rs = resourceSetProvider.get(project);
Resource r = rs.getResource(uri, true);

如果您不通过 guice (YourDslExecutableExtensionFactory) 创建代码，您可以通过 IResourceServiceProvider.Registry 获取 Injector 或 IResourceSetProvider .INSTANCE.getResourceServiceProvider(uri).get(IResourceSetProvider.class);

更新:

您共享的代码(我必须即兴创作很多)看起来更像是一个调试问题。参见

org.eclipse.emf.common.util.URI uri = org.eclipse.emf.common.util.URI
    .createPlatformResourceURI(file.getFullPath().toString(), true);
IResourceSetProvider rs1 = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(uri)
        .get(IResourceSetProvider.class);
ResourceSet rs = rs1.get(project);
Resource r = rs.getResource(uri, true);
TreeIterator<Object> x1 = EcoreUtil.getAllContents(r, true);
while(x1.hasNext()) {
    System.out.println(x1.next());
}
TreeIterator<Object> x2 = EcoreUtil.getAllContents(r, false);
while(x2.hasNext()) {
    System.out.println(x2.next());
}