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;
; Emacs mode for Julia
;
(defvar julia-mode-hook nil)
(add-to-list 'auto-mode-alist '("\\.jl\\'" . julia-mode))
(defvar julia-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?_ "w" table) ; underscores in words
(modify-syntax-entry ?@ "w" table)
(modify-syntax-entry ?# "<" table) ; # single-line comment start
(modify-syntax-entry ?\n ">" table) ; \n single-line comment end
(modify-syntax-entry ?\{ "(} " table)
(modify-syntax-entry ?\} "){ " table)
(modify-syntax-entry ?\[ "(] " table)
(modify-syntax-entry ?\] ")[ " table)
(modify-syntax-entry ?\( "() " table)
(modify-syntax-entry ?\) ")( " table)
;(modify-syntax-entry ?\\ "." table) ; \ is an operator outside quotes
(modify-syntax-entry ?' "." table) ; character quote or transpose
;(modify-syntax-entry ?\" "." table)
(modify-syntax-entry ?? "." table)
(modify-syntax-entry ?$ "." table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?* "." table)
(modify-syntax-entry ?+ "." table)
(modify-syntax-entry ?- "." table)
(modify-syntax-entry ?< "." table)
(modify-syntax-entry ?> "." table)
(modify-syntax-entry ?= "." table)
(modify-syntax-entry ?% "." table)
table)
"Syntax table for julia-mode")
;; syntax table that holds within strings
(defvar julia-mode-string-syntax-table
(let ((table (make-syntax-table)))
table)
"Syntax table for julia-mode")
;; disable " inside char quote
(defvar julia-mode-char-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\" "." table)
table)
"Syntax table for julia-mode")
(defconst julia-string-regex
"\"[^\"]*?\\(\\(\\\\\\\\\\)*\\\\\"[^\"]*?\\)*\"")
(defconst julia-char-regex
"\\(\\s(\\|\\s-\\|-\\|[,%=<>\\+*/?&|$!\\^~\\\\;:]\\|^\\)\\('\\(\\([^']*?[^\\\\]\\)\\|\\(\\\\\\\\\\)\\)'\\)")
(defconst julia-unquote-regex
"\\(\\s(\\|\\s-\\|-\\|[,%=<>\\+*/?&|!\\^~\\\\;:]\\|^\\)\\($[a-zA-Z0-9_]+\\)")
(defconst julia-forloop-in-regex
"for +.*[^
].* \\(in\\)\\(\\s-\\|$\\)+")
(defconst julia-font-lock-keywords
(list '("\\<\\(\\|Uint\\(8\\|16\\|32\\|64\\|128\\)\\|Int\\(8\\|16\\|32\\|64\\|128\\)\\|Integer\\|Float\\|Float32\\|Float64\\|Complex128\\|Complex64\\|ComplexPair\\|Bool\\|Char\\|Number\\|Real\\|Int\\|Uint\\|Array\\|DArray\\|AbstractArray\\|AbstractVector\\|AbstractMatrix\\|SubArray\\|StridedArray\\|StridedVector\\|StridedMatrix\\|VecOrMat\\|StridedVecOrMat\\|Range\\|Range1\\|SparseMatrixCSC\\|Tuple\\|NTuple\\|Symbol\\|Function\\|Vector\\|Matrix\\|Union\\|Type\\|Any\\|Complex\\|None\\|String\\|Ptr\\|Void\\|Exception\\|Task\\|Signed\\|Unsigned\\|Associative\\|Dict\\|IO\\|IOStream\\|Ranges\\|Rational\\|Regex\\|RegexMatch\\|Set\\|IntSet\\|ASCIIString\\|UTF8String\\|ByteString\\|Expr\\|WeakRef\\|Nothing\\|ObjectIdDict\\|SubString\\)\\>" .
font-lock-type-face)
(cons
(concat "\\<\\("
(mapconcat
'identity
'("if" "else" "elseif" "while" "for" "begin" "end" "quote"
"try" "catch" "return" "local" "abstract" "function" "macro" "ccall"
"typealias" "break" "continue" "type" "global" "@\\w+"
"module" "import" "export" "const" "let" "bitstype" "do")
"\\|") "\\)\\>")
'font-lock-keyword-face)
'("\\<\\(true\\|false\\|C_NULL\\|Inf\\|NaN\\|Inf32\\|NaN32\\|nothing\\)\\>" . font-lock-constant-face)
(list julia-unquote-regex 2 'font-lock-constant-face)
(list julia-char-regex 2 'font-lock-string-face)
(list julia-forloop-in-regex 1 'font-lock-keyword-face)
;(list julia-string-regex 0 'font-lock-string-face)
))
(defconst julia-block-start-keywords
(list "if" "while" "for" "begin" "try" "function" "type" "let" "macro"
"quote" "do"))
(defconst julia-block-other-keywords
(list "else" "elseif"))
(defconst julia-block-end-keywords
(list "end" "else" "elseif" "catch"))
(defun julia-member (item lst)
(if (null lst)
nil
(or (equal item (car lst))
(julia-member item (cdr lst)))))
(if (not (fboundp 'evenp))
(defun evenp (x) (zerop (% x 2))))
(defun julia-find-comment-open (p0)
(if (< (point) p0)
nil
(if (and (equal (char-after (point)) ?#)
(evenp (julia-strcount
(buffer-substring p0 (point)) ?\")))
t
(progn (backward-char 1)
(julia-find-comment-open p0)))))
(defun julia-in-comment ()
(save-excursion
(end-of-line)
(backward-char 1)
(julia-find-comment-open (line-beginning-position))))
(defun julia-strcount (str chr)
(let ((i 0)
(c 0))
(while (< i (length str))
(if (equal (elt str i) chr)
(setq c (+ c 1)))
(setq i (+ i 1)))
c))
(defun julia-in-brackets ()
(let ((before (buffer-substring (line-beginning-position) (point))))
(> (julia-strcount before ?[)
(julia-strcount before ?]))))
(defun julia-at-keyword (kw-list)
; not a keyword if used as a field name, X.word, or quoted, :word
(and (or (= (point) 1)
(and (not (equal (char-before (point)) ?.))
(not (equal (char-before (point)) ?:))))
(not (julia-in-comment))
(not (julia-in-brackets))
(julia-member (current-word t) kw-list)))
;; if backward-sexp gives an error, move back 1 char to move over the '('
(defun julia-safe-backward-sexp ()
(if (condition-case nil (backward-sexp) (error t))
(error2nil (backward-char))))
; get the position of the last open block
(defun julia-last-open-block-pos (min)
(let ((count 0))
(while (not (or (> count 0) (<= (point) min)))
(julia-safe-backward-sexp)
(setq count
(cond ((julia-at-keyword julia-block-start-keywords)
(+ count 1))
((and (equal (current-word t) "end")
(not (julia-in-comment)) (not (julia-in-brackets)))
(- count 1))
(t count))))
(if (> count 0)
(point)
nil)))
; get indent for last open block
(defun julia-last-open-block (min)
(let ((pos (julia-last-open-block-pos min)))
(and pos
(progn
(goto-char pos)
(+ julia-basic-offset (current-indentation))))))
(defmacro error2nil (body) `(condition-case nil ,body (error nil)))
(defun julia-paren-indent ()
(let* ((p (parse-partial-sexp (save-excursion
;; only indent by paren if the last open
;; paren is closer than the last open
;; block
(or (julia-last-open-block-pos (point-min))
(point-min)))
(progn (beginning-of-line)
(point))))
(pos (cadr p)))
(if (or (= 0 (car p)) (null pos))
nil
(progn (goto-char pos) (+ 1 (current-column))))))
(defun julia-indent-line ()
"Indent current line of julia code"
(interactive)
; (save-excursion
(end-of-line)
(indent-line-to
(or (save-excursion (error2nil (julia-paren-indent)))
(save-excursion
(let ((endtok (progn
(beginning-of-line)
(forward-to-indentation 0)
(julia-at-keyword julia-block-end-keywords))))
(error2nil (+ (julia-last-open-block (point-min))
(if endtok (- julia-basic-offset) 0)))))
;; previous line ends in =
(save-excursion
(if (and (not (equal (point-min) (line-beginning-position)))
(progn
(forward-line -1)
(end-of-line) (backward-char 1)
(equal (char-after (point)) ?=)))
(+ julia-basic-offset (current-indentation))
nil))
;; take same indentation as previous line
(save-excursion (forward-line -1)
(current-indentation))
0))
(when (julia-at-keyword julia-block-end-keywords)
(forward-word 1)))
(defun julia-mode ()
"Major mode for editing julia code"
(interactive)
(kill-all-local-variables)
(set-syntax-table julia-mode-syntax-table)
(set (make-local-variable 'comment-start) "# ")
(set (make-local-variable 'comment-start-skip) "#+\\s-*")
(set (make-local-variable 'font-lock-defaults) '(julia-font-lock-keywords))
; (set (make-local-variable 'font-lock-syntactic-keywords)
; (list
; (list "\\(\\\\\\)\\s-*\".*?\"" 1 julia-mode-char-syntax-table)))
(set (make-local-variable 'font-lock-syntactic-keywords)
(list
(list julia-char-regex 2
julia-mode-char-syntax-table)
; (list julia-string-regex 0
; julia-mode-string-syntax-table)
))
(set (make-local-variable 'indent-line-function) 'julia-indent-line)
(set (make-local-variable 'julia-basic-offset) 4)
(setq indent-tabs-mode nil)
(setq major-mode 'julia-mode)
(setq mode-name "julia")
(run-hooks 'julia-mode-hook))
(provide 'julia-mode)
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