Updated to IDLWAVE v5.7 (see idlwave.org), and variable cleanup

1 files changed, 242 insertions, 0 deletions

diff --git a/lisp/progmodes/idlw-complete-structtag.el b/lisp/progmodes/idlw-complete-structtag.el
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+;;; idlw-complete-structtag.el --- Completion of structure tags.
+;; Copyright (c) 2001,2002 Free Software Foundation
+
+;; Author: Carsten Dominik <[email protected]>
+;; Maintainer: J.D. Smith <[email protected]>
+;; Version: 1.2
+;; Keywords: languages
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Completion of structure tags can be done automatically in the
+;; shell, since the list of tags can be determined dynamically through
+;; interaction with IDL.
+
+;; Completion of structure tags in a source buffer is highly ambiguous
+;; since you never know what kind of structure a variable will hold at
+;; runtime.  To make this feature useful in source buffers, we need a
+;; special assumption/convention.  We will assume that the structure is
+;; defined in the same buffer and directly assigned to the correct
+;; variable.  This is mainly useful for applications in which there is one
+;; main structure which contains a large amount of information (and many
+;; tags).  For example, many widget applications define a "state" structure
+;; that contains all important data about the application.  The different
+;; routines called by the event handler then use this structure.  If you
+;; use the same variable name for this structure throughout your
+;; application (a good idea for many reasons), IDLWAVE can support
+;; completion for its tags.
+;;
+;; This file is a completion plugin which implements this kind of
+;; completion. It is also an example which shows how completion plugins
+;; should be programmed.
+;;
+;; New versions of IDLWAVE, documentation, and more information available
+;; from:
+;;                 http://idlwave.org
+;;
+;; INSTALLATION
+;; ============
+;; Put this file on the emacs load path and load it with the following 
+;; line in your .emacs file:
+;;
+;;   (add-hook 'idlwave-load-hook 
+;;             (lambda () (require 'idlw-complete-structtag)))
+;;
+;; DESCRIPTION
+;; ===========
+;; Suppose your IDL program contains something like
+;;
+;;     myvar = state.a*
+;;
+;; where the star marks the cursor position.  If you now press the
+;; completion key M-TAB, IDLWAVE searches the current file for a
+;; structure definition
+;;
+;;   state = {tag1:val1, tag2:val2, ...}
+;;
+;; and offers the tags for completion.
+;;
+;; In the idlwave shell, idlwave sends a "print,tag_names()" for the
+;; variable to idl and determines the current tag list dynamically.
+;;
+;; Notes
+;; -----
+;;  - The structure definition assignment "state = {...}" must use the
+;;    same variable name as the the completion location "state.*".
+;;  - The structure definition must be in the same file.
+;;  - The structure definition is searched backwards and then forward
+;;    from the current position, until a definition with tags is found.
+;;  - The file is parsed again for each new completion variable and location.
+;;  - You can force an update of the tag list with the usual command
+;;    to update routine info in IDLWAVE: C-c C-i
+
+
+;; Some variables to identify the previously used structure
+(defvar idlwave-current-tags-var nil)
+(defvar idlwave-current-tags-buffer nil)
+(defvar idlwave-current-tags-completion-pos nil)
+
+;; The tag list used for completion will be stored in the following vars
+(defvar idlwave-current-struct-tags nil)
+(defvar idlwave-sint-structtags nil)
+
+;; Create the sintern type for structure talks
+(idlwave-new-sintern-type 'structtag)
+
+;; Hook the plugin into idlwave
+(add-to-list 'idlwave-complete-special 'idlwave-complete-structure-tag)
+(add-hook 'idlwave-update-rinfo-hook 'idlwave-structtag-reset)
+
+;;; The main code follows below
+
+(defun idlwave-complete-structure-tag ()
+  "Complete a structure tag.
+This works by looking in the current file for a structure assignment to a
+variable with the same name and takes the tags from there.  Quite useful
+for big structures like the state variables of a widget application.
+
+In the idlwave shell, the current content of the variable is used to get
+an up-to-date completion list."
+  (interactive)
+  (let ((pos (point))
+        start
+	(case-fold-search t))
+    (if (save-excursion
+	  ;; Check if the context is right.
+          ;; In the shell, this could be extended to expressions like
+          ;; x[i+4].name.g*.  But it is complicated because we would have
+          ;; to really parse this expression.  For now, we allow only
+          ;; substructures, like "aaa.bbb.ccc.ddd"
+	  (skip-chars-backward "[a-zA-Z0-9._$]")
+          (setq start (point)) ;; remember the start of the completion pos.
+	  (and (< (point) pos)
+	       (not (equal (char-before) ?!)) ; no sysvars
+	       (looking-at "\\([a-zA-Z][.a-zA-Z0-9_]*\\)\\.")
+	       (>= pos (match-end 0))
+	       (not (string= (downcase (match-string 1)) "self"))))
+	(let* ((var (downcase (match-string 1))))
+	  ;; Check if we need to update the "current" structure.  Basically we
+          ;; do it always, except for subsequent completions at the same
+          ;; spot, to save a bit of time.  Implementation:  We require
+          ;; an update if
+          ;; - the variable is different or
+          ;; - the buffer is different or
+          ;; - we are completing at a different position
+	  (if (or (not (string= var (or idlwave-current-tags-var "@")))
+		  (not (eq (current-buffer) idlwave-current-tags-buffer))
+                  (not (equal start idlwave-current-tags-completion-pos)))
+	      (idlwave-prepare-structure-tag-completion var))
+          (setq idlwave-current-tags-completion-pos start)
+	  (setq idlwave-completion-help-info 
+		(list 'idlwave-complete-structure-tag-help))
+	  (idlwave-complete-in-buffer 'structtag 'structtag 
+				      idlwave-current-struct-tags nil
+				      "Select a structure tag" "structure tag")
+	  t) ; we did the completion: return t to skip other completions
+      nil))) ; return nil to allow looking for other ways to complete
+
+(defun idlwave-structtag-reset ()
+  "Force an update of the current structure tag list upon next use."
+  (setq idlwave-current-tags-buffer nil))
+
+(defvar idlwave-structtag-struct-location nil
+  "The location of the structure definition, for help display.")
+
+(defun idlwave-prepare-structure-tag-completion (var)
+  "Find and parse the tag list for structure tag completion."
+  ;; This works differently in source buffers and in the shell
+  (if (eq major-mode 'idlwave-shell-mode)
+      ;; OK, we are in the shell, do it dynamically
+      (progn
+        (message "preparing shell tags") 
+        ;; The following call puts the tags into `idlwave-current-struct-tags'
+        (idlwave-complete-structure-tag-query-shell var)
+        ;; initialize
+        (setq idlwave-sint-structtags nil
+              idlwave-current-tags-buffer (current-buffer)
+              idlwave-current-tags-var var
+              idlwave-structtag-struct-location (point)
+              idlwave-current-struct-tags
+              (mapcar (lambda (x)
+                        (list (idlwave-sintern-structtag x 'set)))
+                      idlwave-current-struct-tags))
+        (if (not idlwave-current-struct-tags)
+            (error "Cannot complete structure tags of variable %s" var)))
+    ;; Not the shell, so probably a source buffer.
+    (unless
+        (catch 'exit
+          (save-excursion
+            (goto-char (point-max))
+            ;; Find possible definitions of the structure.
+            (while (idlwave-find-structure-definition var nil 'all)
+              (let ((tags (idlwave-struct-tags)))
+                (when tags 
+                  ;; initialize
+                  (setq idlwave-sint-structtags nil
+                        idlwave-current-tags-buffer (current-buffer)
+                        idlwave-current-tags-var var
+                        idlwave-structtag-struct-location (point)
+                        idlwave-current-struct-tags
+                        (mapcar (lambda (x)
+                                  (list (idlwave-sintern-structtag x 'set)))
+                                tags))
+                  (throw 'exit t))))))
+      (error "Cannot complete structure tags of variable %s" var))))
+
+(defun idlwave-complete-structure-tag-query-shell (var)
+  "Ask the shell for the tags of the structure in variable or expression VAR."
+  (idlwave-shell-send-command
+   (format "if size(%s,/TYPE) eq 8 then print,tag_names(%s)" var var)
+   'idlwave-complete-structure-tag-get-tags-from-help
+   'hide 'wait))
+
+(defvar idlwave-shell-prompt-pattern)
+(defvar idlwave-shell-command-output)
+(defun idlwave-complete-structure-tag-get-tags-from-help ()
+  "Filter structure tag name output, result to `idlwave-current-struct-tags'."
+    (setq idlwave-current-struct-tags
+	  (if (string-match (concat "tag_names(.*) *\n"
+				    "\\(\\(.*[\r\n]?\\)*\\)"
+				    "\\(" idlwave-shell-prompt-pattern "\\)")
+			    idlwave-shell-command-output)
+	      (split-string (match-string 1 idlwave-shell-command-output)))))
+
+
+;; Fake help in the source buffer for structure tags.
+;; kwd and name are global-variables here.
+(defvar name)
+(defvar kwd)
+(defvar idlwave-help-do-struct-tag)
+(defun idlwave-complete-structure-tag-help (mode word)
+  (cond
+   ((eq mode 'test)
+    ;; fontify only in source buffers, not in the shell.
+    (not (equal idlwave-current-tags-buffer
+                (get-buffer (idlwave-shell-buffer)))))
+   ((eq mode 'set)
+    (setq kwd word
+	  idlwave-help-do-struct-tag idlwave-structtag-struct-location))
+   (t (error "This should not happen"))))
+
+(provide 'idlw-complete-structtag)
+
+;;; idlw-complete-structtag.el ends here
+
+