Using Imenu (emacs) for actionscript

If you use emacs as your editor while programming in actionscript, then this tweak could be really useful for you.

Emacs has got Imenu facility which allows finding major definitions in a file/buffer. In the context of actionscript this includes class definitions, private/protected/public variables, getters/setters and ofcourse functions. Thus, using Imenu you can bind your keys so that it jump on the definition of a function when those keys are pressed. When you change the contents of the file, you can press

*Rescan*

to make it re-read the buffer and generate a new indexing of the file contents. You can also set

'imenu-auto-rescan'

to a non-nil value so that it automatically scans your file, everytime you make any changes. Here is screenshot of the Imenu:

actionscript-mode is already available for emacs and thus by using the mode you can get all sort of code-coloring. After adding actionscript-mode to your mode-list, you need to add this code to your .emacs to get the desired functionality.

(add-hook 'actionscript-mode-hook 'imenu-add-menubar-index)
(add-hook 'actionscript-mode-hook 'actionscript-init-imenu)
(defun actionscript-init-imenu ()
  (interactive)
  (setq imenu-generic-expression as-imenu-as-generic-expression)
  (global-set-key [mouse-3] 'imenu))(defvar as-imenu-as-generic-expression
  ` (
    ("variables"
     ,(concat
       "^"
        "[ t]*(public|protected|mx_internal|private)"
        "[ t]+var"
        "[ t]+([a-zA-Z_][a-zA-Z0-9_]*)"     ; match function name
        "[ t]*:([a-zA-Z_][a-zA-Z0-9_]*)"        ), 2)

    ;; Getters
    ("Getters"
     ,(concat
       "^"
       "[ t]*(override[ tn]+)?"
        "[ t]*(public|protected|mx_internal|private)"
        "[ t]+function"
        "[ t]+"
        "(get[ t]+([a-zA-Z_][a-zA-Z0-9_]*)[ t]*)()"
       ) 3)

    ;;setters
    ("setters"
     ,(concat
       "^"
       "[ t]*(override[ tn]+)?"
        "[ t]*(public|protected|mx_internal|private)"
        "[ t]+function"
        "[ t]+"
        "(set[ t]+([a-zA-Z_][a-zA-Z0-9_]*)[ t]*)"
        "("
        "([a-zA-Z_][a-zA-Z0-9_]*):([a-zA-Z_][a-zA-Z0-9_]*)[ tn]*"
        ")"
       ) 3)

;; Class definitions
    (nil
     ,(concat
         "^"
         "((public|protected|mx_internal|private)[ t]+)?"
         "(class|interface)[ t]+"
         "("                                ; the string we want to get
         "[a-zA-Z0-9_]+"                      ; class name
         ")"
         "[ tn]*"
         "(extends [ tn]*[a-zA-Z0-9_]+)?"
         "[ tn]*";;[:{]"
         "(implements [ tn]*([a-zA-Z0-9_]+[,][ tn]*)*[a-zA-Z0-9_])?"
         "[ tn]*";;[:{]"
         ) 4)

;; General function name regexp
    (nil
     ,(concat
       "^"
       "[ t]*(override[ tn]+)?"
        "[ t]*(public|protected|mx_internal|private)"
       "([ t]+static)?"
        "[ t]+function"
        "[ t]+([a-zA-Z_][a-zA-Z0-9_]*)"     ; match function name
        "[ t]*("
        "[^)]*)"
       ) 4)
    )
  "Imenu generic expression for C++ mode.  See `imenu-generic-expression'.")

Attached is my .emacs file

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Filed under: actionscript, emacs