#| -*-Scheme-*-

$Id: javamode.scm,v 1.16 2007/01/05 21:19:23 cph Exp $

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|#

;;;; Major Mode for Java Programs

;;; This isn't a very good mode for Java, but it is good enough for
;;; some purposes and it was quickly implemented.  The major flaw is
;;; that it indents the body of a definition, such as a method or
;;; nested class, exactly the same as a continued statement.  The only
;;; way to treat these cases differently is to do more sophisticated
;;; parsing that recognizes that the contexts are different.  This
;;; could be done using the keyparser, but that would be much more
;;; work than this was.

(declare (usual-integrations))

(define-major-mode java c "Java"
  "Major mode for editing Java code.
This is just like C mode, except that
  (1) comments begin with // and end at the end of line, and
  (2) c-continued-brace-offset defaults to -2 instead of 0.

\\{java}"
  (lambda (buffer)
    (local-set-variable! syntax-table java-syntax-table buffer)
    (local-set-variable! syntax-ignore-comments-backwards #f buffer)
    (local-set-variable! comment-locator-hook java-comment-locate buffer)
    (local-set-variable! comment-indent-hook java-comment-indentation buffer)
    (local-set-variable! comment-start "// " buffer)
    (local-set-variable! comment-end "" buffer)
    (local-set-variable! c-continued-brace-offset -2 buffer)
    (local-set-variable! local-abbrev-table
			 (ref-variable java-mode-abbrev-table buffer)
			 buffer)
    (event-distributor/invoke! (ref-variable java-mode-hook buffer) buffer)))

(define-command java-mode
  "Enter Java mode."
  ()
  (lambda () (set-current-major-mode! (ref-mode-object java))))

(define-variable java-mode-abbrev-table
  "Mode-specific abbrev table for Java code.")
(define-abbrev-table 'java-mode-abbrev-table '())

(define-variable java-mode-hook
  "An event distributor that is invoked when entering Java mode."
  (make-event-distributor))

(define java-syntax-table
  (let ((syntax-table (make-char-syntax-table c-syntax-table)))
    (set-char-syntax! syntax-table #\/ ". 1456")
    (set-char-syntax! syntax-table #\newline ">")
    syntax-table))

(define (java-comment-locate mark)
  (let ((state (parse-partial-sexp mark (line-end mark 0))))
    (and (parse-state-in-comment? state)
	 (re-match-forward "/\\(/+\\|\\*+\\)[ \t]*"
			   (parse-state-comment-start state))
	 (cons (re-match-start 0) (re-match-end 0)))))

(define (java-comment-indentation mark)
  (let ((column
	 (cond ((re-match-forward "^/\\*" mark)
		0)
	       ((and (match-forward "//" mark)
		     (within-indentation? mark))
		(c-compute-indentation mark))
	       (else
		(ref-variable comment-column mark)))))
    (if (within-indentation? mark)
	column
	(max (+ (mark-column (horizontal-space-start mark)) 1)
	     column))))

(define-major-mode php c "PHP"
  "Major mode for editing PHP code.
This is just like C mode, except that
  (1) comments begin with // and end at the end of line, and
  (2) $ is a symbol constituent rather than a word constituent.

\\{php}"
  (lambda (buffer)
    (local-set-variable! syntax-table php-syntax-table buffer)
    (local-set-variable! syntax-ignore-comments-backwards #f buffer)
    (local-set-variable! comment-locator-hook java-comment-locate buffer)
    (local-set-variable! comment-indent-hook java-comment-indentation buffer)
    (local-set-variable! comment-start "// " buffer)
    (local-set-variable! comment-end "" buffer)
    (local-set-variable! local-abbrev-table
			 (ref-variable php-mode-abbrev-table buffer)
			 buffer)
    (event-distributor/invoke! (ref-variable php-mode-hook buffer) buffer)))

(define-command PHP-mode
  "Enter PHP mode."
  ()
  (lambda () (set-current-major-mode! (ref-mode-object php))))

(define-variable php-mode-abbrev-table
  "Mode-specific abbrev table for PHP code.")
(define-abbrev-table 'php-mode-abbrev-table '())

(define-variable php-mode-hook
  "An event distributor that is invoked when entering PHP mode."
  (make-event-distributor))

(define php-syntax-table
  (let ((syntax-table (make-char-syntax-table java-syntax-table)))
    (set-char-syntax! syntax-table #\$ ". p")
    syntax-table))