Question

序言

将VTK库与C ++一起使用，我经常要写这样的东西：

vtkInteractorStyleRubberBandZoom *isrbz = vtkInteractorStyleRubberBandZoom::New();

此外，每次我需要在程序中使用新的VTK类时，我必须在源文件的某处添加#include“vtkInteractorStyleRubberBandZoom.h”

如何自动化它，所以我必须一次输入每个极其冗长的类名而不是三个？

我尝试为它编写Emacs次要模式。已经有可能存在的解决方案（YaSnippet？），但我认为自己编写也是一个很好的练习。

代码

;vtk-mode.el
;add to .emacs:
;(load  "vtk-mode")
;(global-set-key [(control =)] 'expand-vtk)

(defun expand-vtk ()
  (interactive)
  (setq now (point))
  (setq vtkstart (search-backward "vtk"))
  (setq vtkend (- (search-forward " ") 1))
  (setq vtkname (buffer-substring vtkstart vtkend))

  ;check for #include "vtkBlah.h"
  (setq includename (format "#include \"%s.h\"\n" vtkname))
  (search-backward includename nil (append-include-vtk includename))
  (goto-char (+ now (length includename)))

  (insert (format "= %s::New();" vtkname)))

(defun append-include-vtk (incname)
  (goto-char 0)
  (insert incname))

问题

基本上，它起作用，只是搜索包含名称总是失败，例如： G：

vtkSomething *smth /*press C-= here, it looks backward for 
#include "vtkSomething.h", can't find it and 
calls append-include-vtk, adding it to the beginning 
of the file, then comes back here and expands this line into: */

vtkSomething *smth = vtkSomething::New();

//and let's add another instance of vtkSomething...
vtkSomething *smth2 /*press C-= again, it looks backward for 
#include "vtkSomething", and fails, despite the fact 
that it was added by the previous command. So it adds it again."*/

我在搜索后退时遇到了什么问题？

（代码中还有另一个（至少一个）错误，如果向后搜索成功，我不应该添加（长度包含名称），但是现在我对如何使其成功更感兴趣，首先）

Answer 1

好的，我明白了。不知何故，我有一个想法，搜索后退（noerror）的第三个参数是回调，但事实并非如此。因此，每次都会对其进行评估，而不仅仅是在搜索失败时。它应该是这样的：

(defun expand-vtk ()
  (interactive)
  (setq now (point))
  (setq vtkstart (search-backward "vtk"))
  (setq vtkend (- (search-forward " ") 1))
  (setq vtkname (buffer-substring vtkstart vtkend))

  ;check for #include "vtkBlah.h"
  (setq includename (format "#include \"%s.h\"\n" vtkname))
  (if (search-backward includename nil t) 
      (goto-char now) 
      (progn (append-include-vtk includename) 
             (goto-char (+ now (length includename)))))  

  (insert (format "= %s::New();" vtkname)))

(defun append-include-vtk (incname)
  (goto-char 0)
  (insert incname))

Answer 2

内置于Emacs中的命令可以帮助您避免输入难以忍受的长类名dabbrev-expand（绑定到M-/）：

(dabbrev-expand ARG)

Expand previous word "dynamically".

Expands to the most recent, preceding word for which this is a prefix.
If no suitable preceding word is found, words following point are
considered.  If still no suitable word is found, then look in the
buffers accepted by the function pointed out by variable
`dabbrev-friend-buffer-function'.

输入vtkInteractorStyleRubberBandZoom一次，下次需要时，只需输入vtkI M-/。

Emacs Lisp向后搜索

2 个答案: