以编程方式添加Java代码模板 [英] Add Java code template programmatically

问题描述

我喜欢Eclipse允许我使用Tab键在方法调用中跳转参数。我想让我的插件提供类似的功能。准确地说，我将一些文本注入编辑器，我想强调具体的语法，让程序员使用Tab键跳转到下一个匹配项。

I like when Eclipse lets me jump between parameters in a method call using a Tab key. I would like my plugin to provide a similar functionality. To be precise, I am injecting some piece of text into the editor and I would like to highlight specific syntax and let the programmer jump to the next match using the Tab key.

这是一个例子。假设我动态地创建了以下代码段：

Here is an example. Lets suppose I dynamically created the following snippet:

String a = "bogus string";
int i = a.[?]

我会将其注入编辑器，想要 [？] 被突出显示并准备修改（用户可能键入 length（））。此外，如果有更多的 [？] 碎片，我希望用户使用Tab移动到下一个。

I will inject that into the editor and I would like that [?] is highlighted and ready for modification (user might type length()). Moreover, if there is more [?] fragments, I would like user to use Tab to move to the next one.

经过研究，我发现可以使用模板。但是，我在网上找不到任何相关的例子。有没有人有这样的经验？

After researching a bit, I found that it might be done using templates. However, I can't find any relevant examples on the Web. Does anybody have experience with this?

更新：

我发现两个链接这可能是有用的，虽然我仍然无法提出解决方案。

I found two links that might be useful, although I am still not able to come up with a solution.

link one

link two

推荐答案

样本处理程序代码：

AbstractTextEditor activeEditor = 
        (AbstractTextEditor) HandlerUtil.getActiveEditor(event);

ISourceViewer sourceViewer = 
        (ISourceViewer) activeEditor.getAdapter(ITextOperationTarget.class);

Point range = sourceViewer.getSelectedRange();

// You can generate template dynamically here!
Template template = new Template("sample", 
        "sample description", 
        "no-context", 
        "private void ${name}(){\r\n" + 
        "\tSystem.out.println(\"${name}\")\r\n"
        + "}\r\n", true);

IRegion region = new Region(range.x, range.y);
TemplateContextType contextType = new TemplateContextType("test");
TemplateContext ctx =
    new DocumentTemplateContext(contextType, 
        sourceViewer.getDocument(), 
        range.x, 
        range.y);

TemplateProposal proposal 
    = new TemplateProposal(template, ctx, region, null);

proposal.apply(sourceViewer, (char) 0, 0, 0);

结果：

我建议你使用 org.eclipse.jdt.ui.javaCompletionProposalComputer 扩展名。它允许你可以提供模板更合法的方式。

I suggest you use org.eclipse.jdt.ui.javaCompletionProposalComputer extension. It allows you can contribute Template more legal way.

在我的代码中，有黑客，因为没有办法得到 ISourceViewer 合法。我知道 ISourceViewer 是 ITextTargetOperation 本身，但它不是API（非法铸造）。并且模板旨在设计为由 TemplateCompletionProcessor 或 TemplateCompletionProposalComputer 使用。

In my codes, there are hacks since there is no way to get ISourceViewer legally. I know ISourceViewer is ITextTargetOperation itself, but it is not API(Illegal Casting). And Template is intended to designed to be used by TemplateCompletionProcessor or TemplateCompletionProposalComputer.

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