如何在编写语句后缩进制表符空间

Question

如何在Xtext中编写语句后获得用于美化的制表空间    这是我的代码在Xtext语法中：

 Block:
      '_block' 
         name=ID
     '_endblock' 
    ;

和UI模板

override complete_BLOCK(EObject model, RuleCall ruleCall, ContentAssistContext context, ICompletionProposalAcceptor acceptor) {
      super.complete_BLOCK(model, ruleCall, context, acceptor)
      acceptor.accept(createCompletionProposal("_block \n    
    _endblock","_block",null,context));

}

如何在编写块语句后缩进制表符空间？

Answer 1

实现格式化程序

1. 打开mwe2文件
2. 将formatter = {generateStub = true}添加到工作流程的language = StandardLanguage {部分
3. 重新生成语言
4. 打开MyDslFormatter Xtend类并实现它

调用格式化程序

1. 标记要格式化的部分或不标记以格式化所有内容
2. 调用rightclick - ＆gt;来源 - ＆gt;格式或快捷方式Cmd / Crtl + Shift + F

这是一个非常天真的自动编辑策略的无故障保护

package org.xtext.example.mydsl1.ui;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentCommand;
import org.eclipse.jface.text.IAutoEditStrategy;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.xtext.ui.editor.autoedit.DefaultAutoEditStrategyProvider;

import com.google.inject.Inject;
import com.google.inject.Provider;

public class YourAutoEditStrategyProvider extends DefaultAutoEditStrategyProvider {

    public static class BlockStrategy implements IAutoEditStrategy {

        private static final String BLOCK =  "_block";

        protected int findEndOfWhiteSpace(IDocument document, int offset, int end) throws BadLocationException {
            while (offset < end) {
                char c= document.getChar(offset);
                if (c != ' ' && c != '\t') {
                    return offset;
                }
                offset++;
            }
            return end;
        }

        @Override
        public void customizeDocumentCommand(IDocument d, DocumentCommand c) {
            if ("\n".equals(c.text)) {
                if (d.getLength()> BLOCK.length()) {
                    try {
                        if ((BLOCK+" ").equals(d.get(c.offset-BLOCK.length()-1, BLOCK.length()+1)) || (BLOCK).equals(d.get(c.offset-BLOCK.length(), BLOCK.length()))) {
                            int p= (c.offset == d.getLength() ? c.offset  - 1 : c.offset);
                            IRegion info= d.getLineInformationOfOffset(p);
                            int start= info.getOffset();

                            // find white spaces
                            int end= findEndOfWhiteSpace(d, start, c.offset);
                            int l = 0;
                            StringBuilder buf= new StringBuilder(c.text);
                            if (end > start) {
                                // append to input
                                buf.append(d.get(start, end - start));
                                l += (end - start);
                            }

                            buf.append("\t");
                            buf.append("\n");
                            buf.append(d.get(start, end - start));

                            c.text= buf.toString();
                            c.caretOffset = c.offset+2+l;
                            c.shiftsCaret=false;
                        }
                    } catch (BadLocationException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    }

    @Inject
    private Provider<BlockStrategy> blockStrategy;

    @Override
    protected void configure(IEditStrategyAcceptor acceptor) {
        super.configure(acceptor);
        acceptor.accept(blockStrategy.get(), IDocument.DEFAULT_CONTENT_TYPE);
    }

}

并且不要忘记绑定

class MyDslUiModule extends AbstractMyDslUiModule {

    override bindAbstractEditStrategyProvider() {
        YourAutoEditStrategyProvider
    }

}