Monaco 中有个展开选择的功能，默认如果我们选择 function，扩展选择就会选择到行尾，再扩展就会选中整个函数，效果如下：

Monaco 可以自定义选择范围，通过 registerSelectionRangeProvider 注册 selectionRangeProvider 处理函数

实现 provideSelectionRanges 并返回选择范围

返回位置信息 SelectRange

代码实现如下

export function selectionRangeProvider(
  editor: monacoEditor.editor.IStandaloneCodeEditor,
  monaco: typeof monacoEditor
) {
  return monaco.languages.registerSelectionRangeProvider("mySpecialLanguage", {
    provideSelectionRanges: function(model, positions, token) {
      const ranges = positions.map(position => {
          const word = model.getWordAtPosition(position);
        if (word) {
            
              const range = 
                  new monaco.Range(
                      position.lineNumber,
                      word.startColumn,
                      position.lineNumber,
                      word.endColumn
            )
              
          return [{range: range}];
          }
        return [{ range: new monaco.Range(position.lineNumber, position.column, position.lineNumber, position.column) },
        { range: new monaco.Range(position.lineNumber, position.column, position.lineNumber, position.column) }]
        
        ;
      });
      return ranges;
  }
});

}