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regent-mode.el
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regent-mode.el
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;;; regent-mode.el --- a major-mode for editing Regent scripts -*- lexical-binding: t -*-
;; Based on lua-mode.
;; Author: 2011-2013 immerrr <immerrr+lua@gmail.com>
;; 2010-2011 Reuben Thomas <rrt@sc3d.org>
;; 2006 Juergen Hoetzel <juergen@hoetzel.info>
;; 2004 various (support for Lua 5 and byte compilation)
;; 2001 Christian Vogler <cvogler@gradient.cis.upenn.edu>
;; 1997 Bret Mogilefsky <mogul-lua@gelatinous.com> starting from
;; tcl-mode by Gregor Schmid <schmid@fb3-s7.math.tu-berlin.de>
;; with tons of assistance from
;; Paul Du Bois <pld-lua@gelatinous.com> and
;; Aaron Smith <aaron-lua@gelatinous.com>.
;;
;; URL: http://immerrr.github.com/lua-mode
;; Version: 20151025
;; Package-Requires: ((emacs "24.3"))
;;
;; This file is NOT part of Emacs.
;;
;; This program 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
;; of the License, or (at your option) any later version.
;;
;; This program 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 this program; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
;; MA 02110-1301, USA.
;; Keywords: languages, processes, tools
;; This field is expanded to commit SHA and commit date during the
;; archive creation.
;; Revision: $Format:%h (%cD)$
;;
;;; Commentary:
;; regent-mode provides support for editing Regent, including automatic
;; indentation, syntactical font-locking, running interactive shell,
;; interacting with `hs-minor-mode' and online documentation lookup.
;; The following variables are available for customization (see more via
;; `M-x customize-group regent`):
;; - Var `regent-indent-level':
;; indentation offset in spaces
;; - Var `regent-indent-string-contents':
;; set to `t` if you like to have contents of multiline strings to be
;; indented like comments
;; - Var `regent-indent-nested-block-content-align':
;; set to `nil' to stop aligning the content of nested blocks with the
;; open parenthesis
;; - Var `regent-indent-close-paren-align':
;; set to `t' to align close parenthesis with the open parenthesis,
;; rather than with the beginning of the line
;; - Var `regent-mode-hook':
;; list of functions to execute when regent-mode is initialized
;; - Var `regent-documentation-url':
;; base URL for documentation lookup
;; - Var `regent-documentation-function': function used to
;; show documentation (`eww` is a viable alternative for Emacs 25)
;; These are variables/commands that operate on the Regent process:
;; - Var `regent-default-application':
;; command to start the Regent process (REPL)
;; - Var `regent-default-command-switches':
;; arguments to pass to the Regent process on startup (make sure `-i` is there
;; if you expect working with Regent shell interactively)
;; - Cmd `regent-start-process': start new REPL process, usually happens automatically
;; - Cmd `regent-kill-process': kill current REPL process
;; These are variables/commands for interaction with the Regent process:
;; - Cmd `regent-show-process-buffer': switch to REPL buffer
;; - Cmd `regent-hide-process-buffer': hide window showing REPL buffer
;; - Var `regent-always-show': show REPL buffer after sending something
;; - Cmd `regent-send-buffer': send whole buffer
;; - Cmd `regent-send-current-line': send current line
;; - Cmd `regent-send-defun': send current top-level function
;; - Cmd `regent-send-region': send active region
;; - Cmd `regent-restart-with-whole-file': restart REPL and send whole buffer
;; See "M-x apropos-command ^regent-" for a list of commands.
;; See "M-x customize-group regent" for a list of customizable variables.
;;; Code:
(eval-when-compile
(require 'cl-lib))
(require 'comint)
(require 'newcomment)
(require 'rx)
;; rx-wrappers for Regent
(eval-when-compile
;; Silence compilation warning about `compilation-error-regexp-alist' defined
;; in compile.el.
(require 'compile))
(eval-and-compile
(if (fboundp #'rx-let)
(progn
;; Emacs 27+ way of customizing rx
(defvar regent--rx-bindings)
(setq
regent--rx-bindings
'((symbol (&rest x) (seq symbol-start (or x) symbol-end))
(ws (* (any " \t")))
(ws+ (+ (any " \t")))
(regent-name (symbol (seq (+ (any alpha "_")) (* (any alnum "_")))))
(regent-funcname (seq regent-name (* ws "." ws regent-name)
(opt ws ":" ws regent-name)))
(regent-funcheader
;; Outer (seq ...) is here to shy-group the definition
(seq (or (seq (symbol "function") ws (group-n 1 regent-funcname))
(seq (group-n 1 regent-funcname) ws "=" ws
(symbol "function")))))
(regent-number
(seq (or (seq (+ digit) (opt ".") (* digit))
(seq (* digit) (opt ".") (+ digit)))
(opt (regexp "[eE][+-]?[0-9]+"))))
(regent-assignment-op (seq "=" (or buffer-end (not (any "=")))))
(regent-token (or "+" "-" "*" "/" "%" "^" "#" "==" "~=" "<=" ">=" "<"
">" "=" ";" ":" "," "." ".." "..."
;; Terra tokens
"`" "@"
))
(regent-keyword
(symbol "and" "break" "do" "else" "elseif" "end" "for" "function"
"goto" "if" "in" "local" "not" "or" "repeat" "return"
"then" "until" "while"
;; Terra keywords
"defer" "emit" "escape" "import" "quote" "struct" "terra"
"var"
;; Regent keywords
"__block" "__constant_time_launch" "__context" "__cuda"
"__delete" "__demand" "__execution" "__fence" "__fields"
"__forbid" "__future" "__idempotent" "__import_ispace"
"__import_region" "__import_partition"
"__import_cross_product" "__index_launch" "__inline"
"__inner" "__leaf" "__local" "__line" "__mapping"
"__openmp" "__optimize" "__parallel" "__parallelize_with"
"__parallel_prefix" "__physical" "__predicate" "__raw"
"__replicable" "__runtime" "__spmd" "__task" "__trace"
"__unroll" "__vectorize" "acquire" "aliased"
"allocate_scratch_fields" "adjust" "advance" "arrive"
"await" "arrives" "attach" "awaits" "atomic" "complete"
"copy" "cross_product" "cross_product_array" "detach"
"disjoint" "dynamic_cast" "dynamic_collective"
"dynamic_collective_get_result" "exclusive" "extern"
"equal" "fill" "hdf5" "image" "incomplete" "isnull"
"ispace" "list_cross_product" "list_cross_product_complete"
"list_slice_partition" "list_duplicate_partition"
"list_invert" "list_phase_barriers" "list_range"
"list_ispace" "list_from_element" "max" "min" "must_epoch"
"new" "no_access_flag" "null" "partition" "phase_barrier"
"preimage" "product" "reads" "reduces" "relaxed" "release"
"rescape" "region" "restrict" "simultaneous" "static_cast"
"unsafe_cast" "wild" "with_scratch_fields" "where" "writes"
"fspace" "rexpr" "rquote" "task"
))))
(defmacro regent-rx (&rest regexps)
(eval `(rx-let ,regent--rx-bindings
(rx ,@regexps))))
(defun regent-rx-to-string (form &optional no-group)
(rx-let-eval regent--rx-bindings
(rx-to-string form no-group))))
(progn
;; Pre-Emacs 27 way of customizing rx
(defvar regent-rx-constituents)
(defvar rx-parent)
(defun regent-rx-to-string (form &optional no-group)
"Regent-specific replacement for `rx-to-string'.
See `rx-to-string' documentation for more information FORM and
NO-GROUP arguments."
(let ((rx-constituents regent-rx-constituents))
(rx-to-string form no-group)))
(defmacro regent-rx (&rest regexps)
"Regent-specific replacement for `rx'.
See `rx' documentation for more information about REGEXPS param."
(cond ((null regexps)
(error "No regexp"))
((cdr regexps)
(regent-rx-to-string `(and ,@regexps) t))
(t
(regent-rx-to-string (car regexps) t))))
(defun regent--new-rx-form (form)
"Add FORM definition to `regent-rx' macro.
FORM is a cons (NAME . DEFN), see more in `rx-constituents' doc.
This function enables specifying new definitions using old ones:
if DEFN is a list that starts with `:rx' symbol its second
element is itself expanded with `regent-rx-to-string'. "
(let ((form-definition (cdr form)))
(when (and (listp form-definition) (eq ':rx (car form-definition)))
(setcdr form (regent-rx-to-string (cadr form-definition) 'nogroup)))
(push form regent-rx-constituents)))
(defun regent--rx-symbol (form)
;; form is a list (symbol XXX ...)
;; Skip initial 'symbol
(setq form (cdr form))
;; If there's only one element, take it from the list, otherwise wrap the
;; whole list into `(or XXX ...)' form.
(setq form (if (eq 1 (length form))
(car form)
(append '(or) form)))
(and (fboundp 'rx-form) ; Silence Emacs 27's byte-compiler.
(rx-form `(seq symbol-start ,form symbol-end) rx-parent)))
(setq regent-rx-constituents (copy-sequence rx-constituents))
(mapc 'regent--new-rx-form
`((symbol regent--rx-symbol 1 nil)
(ws . "[ \t]*") (ws+ . "[ \t]+")
(regent-name :rx (symbol (regexp "[[:alpha:]_]+[[:alnum:]_]*")))
(regent-funcname
:rx (seq regent-name (* ws "." ws regent-name)
(opt ws ":" ws regent-name)))
(regent-funcheader
;; Outer (seq ...) is here to shy-group the definition
:rx (seq (or (seq (symbol "function"
;; Terra keywords
"struct"
"terra"
;; Regent keywords
"fspace"
"task"
)
ws (group-n 1 regent-funcname))
(seq (group-n 1 regent-funcname) ws "=" ws
(symbol "function"
;; Terra keywords
"struct"
"terra"
;; Regent keywords
"fspace"
"task"
)))))
(regent-number
:rx (seq (or (seq (+ digit) (opt ".") (* digit))
(seq (* digit) (opt ".") (+ digit)))
(opt (regexp "[eE][+-]?[0-9]+"))))
(regent-assignment-op
:rx (seq "=" (or buffer-end (not (any "=")))))
(regent-token
:rx (or "+" "-" "*" "/" "%" "^" "#" "==" "~=" "<=" ">=" "<"
">" "=" ";" ":" "," "." ".." "..."
;; Terra tokens
"`" "@"
))
(regent-keyword
:rx (symbol "and" "break" "do" "else" "elseif" "end" "for" "function"
"goto" "if" "in" "local" "not" "or" "repeat" "return"
"then" "until" "while"
;; Terra keywords
"defer" "emit" "escape" "import" "quote" "struct"
"terra" "var"
;; Regent keywords
"__block" "__context" "__cuda" "__delete"
"__demand" "__execution" "__external" "__fence"
"__fields" "__forbid" "__future" "__idempotent"
"__import_ispace" "__import_partition"
"__import_region" "__index_launch" "__inline"
"__inner" "__leaf" "__mapping" "__openmp"
"__optimize" "__parallel" "__parallel_prefix"
"__parallelize_with" "__physical" "__predicate"
"__raw" "__replicable" "__runtime" "__spmd"
"__task" "__trace" "__unroll" "__vectorize"
"acquire" "adjust" "advance" "aliased"
"allocate_scratch_fields" "arrive" "arrives"
"atomic" "attach" "await" "awaits" "complete"
"copy" "cross_product" "cross_product_array"
"detach" "disjoint" "dynamic_cast"
"dynamic_collective"
"dynamic_collective_get_result" "equal" "exclusive"
"extern" "fill" "hdf5" "image" "incomplete"
"isnull" "ispace" "list_cross_product"
"list_cross_product_complete"
"list_duplicate_partition" "list_from_element"
"list_invert" "list_ispace" "list_phase_barriers"
"list_range" "list_slice_partition" "max" "min"
"must_epoch" "new" "no_access_flag" "null"
"partition" "phase_barrier" "preimage" "product"
"reads" "reduces" "region" "relaxed" "release"
"restrict" "simultaneous" "static_cast"
"unsafe_cast" "where" "wild" "with_scratch_fields"
"writes"
)))
))))
;; Local variables
(defgroup regent nil
"Major mode for editing Regent code."
:prefix "regent-"
:group 'languages)
(defcustom regent-indent-level 2
"Amount by which Regent subexpressions are indented."
:type 'integer
:group 'regent
:safe #'integerp)
(defcustom regent-comment-start "-- "
"Default value of `comment-start'."
:type 'string
:group 'regent)
(defcustom regent-comment-start-skip "---*[ \t]*"
"Default value of `comment-start-skip'."
:type 'string
:group 'regent)
(defcustom regent-default-application "regent"
"Default application to run in Regent process."
:type '(choice (string)
(cons string integer))
:group 'regent)
(defcustom regent-default-command-switches (list "-i")
"Command switches for `regent-default-application'.
Should be a list of strings."
:type '(repeat string)
:group 'regent)
(make-variable-buffer-local 'regent-default-command-switches)
(defcustom regent-always-show t
"*Non-nil means display regent-process-buffer after sending a command."
:type 'boolean
:group 'regent)
(defcustom regent-documentation-function 'browse-url
"Function used to fetch the Regent reference manual."
:type `(radio (function-item browse-url)
,@(when (fboundp 'eww) '((function-item eww)))
,@(when (fboundp 'w3m-browse-url) '((function-item w3m-browse-url)))
(function :tag "Other function"))
:group 'regent)
(defcustom regent-documentation-url
(or (and (file-readable-p "/usr/share/doc/lua/manual.html")
"file:///usr/share/doc/lua/manual.html")
"http://www.lua.org/manual/5.1/manual.html")
"URL pointing to the Lua reference manual."
:type 'string
:group 'regent)
(defvar regent-process nil
"The active Regent process")
(defvar regent-process-buffer nil
"Buffer used for communication with the Regent process")
(defun regent--customize-set-prefix-key (prefix-key-sym prefix-key-val)
(cl-assert (eq prefix-key-sym 'regent-prefix-key))
(set prefix-key-sym (if (and prefix-key-val (> (length prefix-key-val) 0))
;; read-kbd-macro returns a string or a vector
;; in both cases (elt x 0) is ok
(elt (read-kbd-macro prefix-key-val) 0)))
(if (fboundp 'regent-prefix-key-update-bindings)
(regent-prefix-key-update-bindings)))
(defcustom regent-prefix-key "\C-c"
"Prefix for all regent-mode commands."
:type 'string
:group 'regent
:set 'regent--customize-set-prefix-key
:get '(lambda (sym)
(let ((val (eval sym))) (if val (single-key-description (eval sym)) ""))))
(defvar regent-mode-menu (make-sparse-keymap "Regent")
"Keymap for regent-mode's menu.")
(defvar regent-prefix-mode-map
(eval-when-compile
(let ((result-map (make-sparse-keymap)))
(mapc (lambda (key_defn)
(define-key result-map (read-kbd-macro (car key_defn)) (cdr key_defn)))
'(("C-l" . regent-send-buffer)
("C-f" . regent-search-documentation)))
result-map))
"Keymap that is used to define keys accessible by `regent-prefix-key'.
If the latter is nil, the keymap translates into `regent-mode-map' verbatim.")
(defvar regent--electric-indent-chars
(mapcar #'string-to-char '("}" "]" ")")))
(defvar regent-mode-map
(let ((result-map (make-sparse-keymap)))
(unless (boundp 'electric-indent-chars)
(mapc (lambda (electric-char)
(define-key result-map
(read-kbd-macro
(char-to-string electric-char))
#'regent-electric-match))
regent--electric-indent-chars))
(define-key result-map [menu-bar regent-mode] (cons "Regent" regent-mode-menu))
;; FIXME: see if the declared logic actually works
;; handle prefix-keyed bindings:
;; * if no prefix, set prefix-map as parent, i.e.
;; if key is not defined look it up in prefix-map
;; * if prefix is set, bind the prefix-map to that key
(if (boundp 'regent-prefix-key)
(define-key result-map (vector regent-prefix-key) regent-prefix-mode-map)
(set-keymap-parent result-map regent-prefix-mode-map))
result-map)
"Keymap used in regent-mode buffers.")
(defvar regent-electric-flag t
"If t, electric actions (like automatic reindentation) will happen when an electric
key like `{' is pressed")
(make-variable-buffer-local 'regent-electric-flag)
(defcustom regent-prompt-regexp "[^\n]*\\(>[\t ]+\\)+$"
"Regexp which matches the Regent program's prompt."
:type 'regexp
:group 'regent)
(defcustom regent-traceback-line-re
;; This regexp skips prompt and meaningless "stdin:N:" prefix when looking
;; for actual file-line locations.
"^\\(?:[\t ]*\\|.*>[\t ]+\\)\\(?:[^\n\t ]+:[0-9]+:[\t ]*\\)*\\(?:\\([^\n\t ]+\\):\\([0-9]+\\):\\)"
"Regular expression that describes tracebacks and errors."
:type 'regexp
:group 'regent)
(defvar regent--repl-buffer-p nil
"Buffer-local flag saying if this is a Regent REPL buffer.")
(make-variable-buffer-local 'regent--repl-buffer-p)
(defadvice compilation-find-file (around regent--repl-find-file
(marker filename directory &rest formats)
activate)
"Return Regent REPL buffer when looking for \"stdin\" file in it."
(if (and
regent--repl-buffer-p
(string-equal filename "stdin")
;; NOTE: this doesn't traverse `compilation-search-path' when
;; looking for filename.
(not (file-exists-p (expand-file-name
filename
(when directory (expand-file-name directory))))))
(setq ad-return-value (current-buffer))
ad-do-it))
(defadvice compilation-goto-locus (around regent--repl-goto-locus
(msg mk end-mk)
activate)
"When message points to Regent REPL buffer, go to the message itself.
Usually, stdin:XX line number points to nowhere."
(let ((errmsg-buf (marker-buffer msg))
(error-buf (marker-buffer mk)))
(if (and (with-current-buffer errmsg-buf regent--repl-buffer-p)
(eq error-buf errmsg-buf))
(progn
(compilation-set-window (display-buffer (marker-buffer msg)) msg)
(goto-char msg))
ad-do-it)))
(defcustom regent-indent-string-contents nil
"If non-nil, contents of multiline string will be indented.
Otherwise leading amount of whitespace on each line is preserved."
:group 'regent
:type 'boolean)
(defcustom regent-indent-nested-block-content-align t
"If non-nil, the contents of nested blocks are indented to
align with the column of the opening parenthesis, rather than
just forward by `regent-indent-level'."
:group 'regent
:type 'boolean)
(defcustom regent-indent-close-paren-align t
"If non-nil, close parenthesis are aligned with their open
parenthesis. If nil, close parenthesis are aligned to the
beginning of the line."
:group 'regent
:type 'boolean)
(defcustom regent-jump-on-traceback t
"*Jump to innermost traceback location in *regent* buffer. When this
variable is non-nil and a traceback occurs when running Regent code in a
process, jump immediately to the source code of the innermost
traceback location."
:type 'boolean
:group 'regent)
(defcustom regent-mode-hook nil
"Hooks called when Regent mode fires up."
:type 'hook
:group 'regent)
(defvar regent-region-start (make-marker)
"Start of special region for Regent communication.")
(defvar regent-region-end (make-marker)
"End of special region for Regent communication.")
(defvar regent-emacs-menu
'(["Restart With Whole File" regent-restart-with-whole-file t]
["Kill Process" regent-kill-process t]
["Hide Process Buffer" regent-hide-process-buffer t]
["Show Process Buffer" regent-show-process-buffer t]
["Beginning Of Proc" regent-beginning-of-proc t]
["End Of Proc" regent-end-of-proc t]
["Set Regent-Region Start" regent-set-regent-region-start t]
["Set Regent-Region End" regent-set-regent-region-end t]
["Send Regent-Region" regent-send-regent-region t]
["Send Current Line" regent-send-current-line t]
["Send Region" regent-send-region t]
["Send Proc" regent-send-proc t]
["Send Buffer" regent-send-buffer t]
["Search Documentation" regent-search-documentation t])
"Emacs menu for Regent mode.")
;; the whole defconst is inside eval-when-compile, because it's later referenced
;; inside another eval-and-compile block
(eval-and-compile
(defconst
regent--builtins
(let*
((modules
'("_G" "_VERSION" "assert" "collectgarbage" "dofile" "error" "getfenv"
"getmetatable" "ipairs" "load" "loadfile" "loadstring" "module"
"next" "pairs" "pcall" "print" "rawequal" "rawget" "rawlen" "rawset"
"require" "select" "setfenv" "setmetatable" "tonumber" "tostring"
"type" "unpack" "xpcall" "self"
("bit32" . ("arshift" "band" "bnot" "bor" "btest" "bxor" "extract"
"lrotate" "lshift" "replace" "rrotate" "rshift"))
("coroutine" . ("create" "isyieldable" "resume" "running" "status"
"wrap" "yield"))
("debug" . ("debug" "getfenv" "gethook" "getinfo" "getlocal"
"getmetatable" "getregistry" "getupvalue" "getuservalue"
"setfenv" "sethook" "setlocal" "setmetatable"
"setupvalue" "setuservalue" "traceback" "upvalueid"
"upvaluejoin"))
("io" . ("close" "flush" "input" "lines" "open" "output" "popen"
"read" "stderr" "stdin" "stdout" "tmpfile" "type" "write"))
("math" . ("abs" "acos" "asin" "atan" "atan2" "ceil" "cos" "cosh"
"deg" "exp" "floor" "fmod" "frexp" "huge" "ldexp" "log"
"log10" "max" "maxinteger" "min" "mininteger" "modf" "pi"
"pow" "rad" "random" "randomseed" "sin" "sinh" "sqrt"
"tan" "tanh" "tointeger" "type" "ult"))
("os" . ("clock" "date" "difftime" "execute" "exit" "getenv"
"remove" "rename" "setlocale" "time" "tmpname"))
("package" . ("config" "cpath" "loaded" "loaders" "loadlib" "path"
"preload" "searchers" "searchpath" "seeall"))
("string" . ("byte" "char" "dump" "find" "format" "gmatch" "gsub"
"len" "lower" "match" "pack" "packsize" "rep" "reverse"
"sub" "unpack" "upper"))
("table" . ("concat" "insert" "maxn" "move" "pack" "remove" "sort"
"unpack"))
("utf8" . ("char" "charpattern" "codepoint" "codes" "len"
"offset")))))
(cl-labels
((module-name-re (x)
(concat "\\(?1:\\_<"
(if (listp x) (car x) x)
"\\_>\\)"))
(module-members-re (x) (if (listp x)
(concat "\\(?:[ \t]*\\.[ \t]*"
"\\_<\\(?2:"
(regexp-opt (cdr x))
"\\)\\_>\\)?")
"")))
(concat
;; common prefix:
;; - beginning-of-line
;; - or neither of [ '.', ':' ] to exclude "foo.string.rep"
;; - or concatenation operator ".."
"\\(?:^\\|[^:. \t]\\|[.][.]\\)"
;; optional whitespace
"[ \t]*"
"\\(?:"
;; any of modules/functions
(mapconcat (lambda (x) (concat (module-name-re x)
(module-members-re x)))
modules
"\\|")
"\\)"))))
"A regexp that matches Regent builtin functions & variables.
This is a compilation of 5.1, 5.2 and 5.3 builtins taken from the
index of respective Regent reference manuals.")
(eval-and-compile
(defun regent-make-delimited-matcher (elt-regexp sep-regexp end-regexp)
"Construct matcher function for `font-lock-keywords' to match a sequence.
It's supposed to match sequences with following EBNF:
ELT-REGEXP { SEP-REGEXP ELT-REGEXP } END-REGEXP
The sequence is parsed one token at a time. If non-nil is
returned, `match-data' will have one or more of the following
groups set according to next matched token:
1. matched element token
2. unmatched garbage characters
3. misplaced token (i.e. SEP-REGEXP when ELT-REGEXP is expected)
4. matched separator token
5. matched end token
Blanks & comments between tokens are silently skipped.
Groups 6-9 can be used in any of argument regexps."
(let*
((delimited-matcher-re-template
"\\=\\(?2:.*?\\)\\(?:\\(?%s:\\(?4:%s\\)\\|\\(?5:%s\\)\\)\\|\\(?%s:\\(?1:%s\\)\\)\\)")
;; There's some magic to this regexp. It works as follows:
;;
;; A. start at (point)
;; B. non-greedy match of garbage-characters (?2:)
;; C. try matching separator (?4:) or end-token (?5:)
;; D. try matching element (?1:)
;;
;; Simple, but there's a trick: pt.C and pt.D are embraced by one more
;; group whose purpose is determined only after the template is
;; formatted (?%s:):
;;
;; - if element is expected, then D's parent group becomes "shy" and C's
;; parent becomes group 3 (aka misplaced token), so if D matches when
;; an element is expected, it'll be marked with warning face.
;;
;; - if separator-or-end-token is expected, then it's the opposite:
;; C's parent becomes shy and D's will be matched as misplaced token.
(elt-expected-re (format delimited-matcher-re-template
3 sep-regexp end-regexp "" elt-regexp))
(sep-or-end-expected-re (format delimited-matcher-re-template
"" sep-regexp end-regexp 3 elt-regexp)))
(lambda (end)
(let* ((prev-elt-p (match-beginning 1))
(prev-end-p (match-beginning 5))
(regexp (if prev-elt-p sep-or-end-expected-re elt-expected-re))
(comment-start (regent-comment-start-pos (syntax-ppss)))
(parse-stop end))
;; If token starts inside comment, or end-token was encountered, stop.
(when (and (not comment-start)
(not prev-end-p))
;; Skip all comments & whitespace. forward-comment doesn't have boundary
;; argument, so make sure point isn't beyond parse-stop afterwards.
(while (and (< (point) end)
(forward-comment 1)))
(goto-char (min (point) parse-stop))
;; Reuse comment-start variable to store beginning of comment that is
;; placed before line-end-position so as to make sure token search doesn't
;; enter that comment.
(setq comment-start
(regent-comment-start-pos
(save-excursion
(parse-partial-sexp (point) parse-stop
nil nil nil 'stop-inside-comment)))
parse-stop (or comment-start parse-stop))
;; Now, let's match stuff. If regular matcher fails, declare a span of
;; non-blanks 'garbage', and the next iteration will start from where the
;; garbage ends. If couldn't match any garbage, move point to the end
;; and return nil.
(or (re-search-forward regexp parse-stop t)
(re-search-forward "\\(?1:\\(?2:[^ \t]+\\)\\)" parse-stop 'skip)
(prog1 nil (goto-char end)))))))))
(defvar regent-font-lock-keywords
`(;; highlight the hash-bang line "#!/foo/bar/regent" as comment
("^#!.*$" . font-lock-comment-face)
;; Builtin constants
(,(regent-rx (symbol "true" "false" "nil"))
. font-lock-constant-face)
;; Keywords
(,(regent-rx regent-keyword)
. font-lock-keyword-face)
;; Labels used by the "goto" statement
;; Highlights the following syntax: ::label::
(,(regent-rx "::" ws regent-name ws "::")
. font-lock-constant-face)
;; Highlights the name of the label in the "goto" statement like
;; "goto label"
(,(regent-rx (symbol (seq "goto" ws+ (group-n 1 regent-name))))
(1 font-lock-constant-face))
;; Highlight Regent builtin functions and variables
(,regent--builtins
(1 font-lock-builtin-face) (2 font-lock-builtin-face nil noerror))
("^[ \t]*\\_<for\\_>"
(,(regent-make-delimited-matcher (regent-rx regent-name) ","
(regent-rx (or (symbol "in") regent-assignment-op)))
nil nil
(1 font-lock-variable-name-face nil noerror)
(2 font-lock-warning-face t noerror)
(3 font-lock-warning-face t noerror)))
;; Handle local variable/function names
;; local blalba, xyzzy =
;; ^^^^^^ ^^^^^
;;
;; local function foobar(x,y,z)
;; ^^^^^^
;; local foobar = function(x,y,z)
;; ^^^^^^
("^[ \t]*\\_<local\\_>"
(0 font-lock-keyword-face)
;; (* nonl) at the end is to consume trailing characters or otherwise they
;; delimited matcher would attempt to parse them afterwards and wrongly
;; highlight parentheses as incorrect variable name characters.
(,(regent-rx point ws regent-funcheader (* nonl))
nil nil
(1 font-lock-function-name-face nil noerror))
(,(regent-make-delimited-matcher (regent-rx regent-name) ","
(regent-rx regent-assignment-op))
nil nil
(1 font-lock-variable-name-face nil noerror)
(2 font-lock-warning-face t noerror)
(3 font-lock-warning-face t noerror)))
(,(regent-rx (or bol ";") ws regent-funcheader)
(1 font-lock-function-name-face))
(,(regent-rx (or (group-n 1
"@" (symbol "author" "copyright" "field" "release"
"return" "see" "usage" "description"))
(seq (group-n 1 "@" (symbol "param" "class" "name")) ws+
(group-n 2 regent-name))))
(1 font-lock-keyword-face t)
(2 font-lock-variable-name-face t noerror)))
"Default expressions to highlight in Regent mode.")
(defvar regent-imenu-generic-expression
`(("Requires" ,(regent-rx (or bol ";") ws (opt (seq (symbol "local") ws)) (group-n 1 regent-name) ws "=" ws (symbol "require")) 1)
(nil ,(regent-rx (or bol ";") ws (opt (seq (symbol "local") ws)) regent-funcheader) 1))
"Imenu generic expression for regent-mode. See `imenu-generic-expression'.")
(defvar regent-sexp-alist '(("then" . "end")
("function" . "end")
("do" . "end")
("repeat" . "until")
;; Terra keywords
("escape" . "end")
("quote" . "end")
("terra" . "end")
;; Regent keywords
("rescape" . "end")
("rexpr" . "end")
("rquote" . "end")
("task" . "end")
))
(define-abbrev-table 'regent-mode-abbrev-table
'(("end" "end" regent-indent-line :system t)
("else" "else" regent-indent-line :system t)
("elseif" "elseif" regent-indent-line :system t)))
(defvar regent-mode-syntax-table
(with-syntax-table (copy-syntax-table)
;; main comment syntax: begins with "--", ends with "\n"
(modify-syntax-entry ?- ". 12")
(modify-syntax-entry ?\n ">")
;; main string syntax: bounded by ' or "
(modify-syntax-entry ?\' "\"")
(modify-syntax-entry ?\" "\"")
;; single-character binary operators: punctuation
(modify-syntax-entry ?+ ".")
(modify-syntax-entry ?* ".")
(modify-syntax-entry ?/ ".")
(modify-syntax-entry ?^ ".")
(modify-syntax-entry ?% ".")
(modify-syntax-entry ?> ".")
(modify-syntax-entry ?< ".")
(modify-syntax-entry ?= ".")
(modify-syntax-entry ?~ ".")
(syntax-table))
"`regent-mode' syntax table.")
;;;###autoload
(define-derived-mode regent-mode prog-mode "Regent"
"Major mode for editing Regent code."
:abbrev-table regent-mode-abbrev-table
:syntax-table regent-mode-syntax-table
:group 'regent
(setq-local font-lock-defaults '(regent-font-lock-keywords ;; keywords
nil ;; keywords-only
nil ;; case-fold
nil ;; syntax-alist
nil ;; syntax-begin
))
(setq-local syntax-propertize-function
'regent--propertize-multiline-bounds)
(setq-local parse-sexp-lookup-properties t)
(setq-local indent-line-function 'regent-indent-line)
(setq-local beginning-of-defun-function 'regent-beginning-of-proc)
(setq-local end-of-defun-function 'regent-end-of-proc)
(setq-local comment-start regent-comment-start)
(setq-local comment-start-skip regent-comment-start-skip)
(setq-local comment-use-syntax t)
(setq-local fill-paragraph-function #'regent--fill-paragraph)
(with-no-warnings
(setq-local comment-use-global-state t))
(setq-local imenu-generic-expression regent-imenu-generic-expression)
(when (boundp 'electric-indent-chars)
;; If electric-indent-chars is not defined, electric indentation is done
;; via `regent-mode-map'.
(setq-local electric-indent-chars
(append electric-indent-chars regent--electric-indent-chars)))
;; setup menu bar entry (XEmacs style)
(if (and (featurep 'menubar)
(boundp 'current-menubar)
(fboundp 'set-buffer-menubar)
(fboundp 'add-menu)
(not (assoc "Regent" current-menubar)))
(progn
(set-buffer-menubar (copy-sequence current-menubar))
(add-menu nil "Regent" regent-emacs-menu)))
;; Append Regent menu to popup menu for Emacs.
(if (boundp 'mode-popup-menu)
(setq mode-popup-menu
(cons (concat mode-name " Mode Commands") regent-emacs-menu)))
;; hideshow setup
(unless (assq 'regent-mode hs-special-modes-alist)
(add-to-list 'hs-special-modes-alist
`(regent-mode
,(regexp-opt (mapcar 'car regent-sexp-alist) 'words) ;start
,(regexp-opt (mapcar 'cdr regent-sexp-alist) 'words) ;end
nil regent-forward-sexp))))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.rg\\'" . regent-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist '("regent" . regent-mode))
(defun regent-electric-match (arg)
"Insert character and adjust indentation."
(interactive "P")
(let (blink-paren-function)
(self-insert-command (prefix-numeric-value arg)))
(if regent-electric-flag
(regent-indent-line))
(blink-matching-open))
;; private functions
(defun regent--fill-paragraph (&optional justify region)
;; Implementation of forward-paragraph for filling.
;;
;; This function works around a corner case in the following situations:
;;
;; <>
;; -- some very long comment ....
;; some_code_right_after_the_comment
;;
;; If point is at the beginning of the comment line, fill paragraph code
;; would have gone for comment-based filling and done the right thing, but it
;; does not find a comment at the beginning of the empty line before the
;; comment and falls back to text-based filling ignoring comment-start and
;; spilling the comment into the code.
(save-excursion
(while (and (not (eobp))
(progn (move-to-left-margin)
(looking-at paragraph-separate)))
(forward-line 1))
(let ((fill-paragraph-handle-comment t))
(fill-paragraph justify region))))
(defun regent-prefix-key-update-bindings ()
(let (old-cons)
(if (eq regent-prefix-mode-map (keymap-parent regent-mode-map))
;; if prefix-map is a parent, delete the parent
(set-keymap-parent regent-mode-map nil)
;; otherwise, look for it among children
(if (setq old-cons (rassoc regent-prefix-mode-map regent-mode-map))
(delq old-cons regent-mode-map)))
(if (null regent-prefix-key)
(set-keymap-parent regent-mode-map regent-prefix-mode-map)
(define-key regent-mode-map (vector regent-prefix-key) regent-prefix-mode-map))))
(defun regent-set-prefix-key (new-key-str)
"Changes `regent-prefix-key' properly and updates keymaps
This function replaces previous prefix-key binding with a new one."
(interactive "sNew prefix key (empty string means no key): ")
(regent--customize-set-prefix-key 'regent-prefix-key new-key-str)
(message "Prefix key set to %S" (single-key-description regent-prefix-key))
(regent-prefix-key-update-bindings))
(defun regent-string-p (&optional pos)
"Returns true if the point is in a string."
(save-excursion (elt (syntax-ppss pos) 3)))
(defun regent-comment-start-pos (parsing-state)
"Return position of comment containing current point.
If point is not inside a comment, return nil."
(and parsing-state (nth 4 parsing-state) (nth 8 parsing-state)))
(defun regent-comment-or-string-p (&optional pos)
"Returns true if the point is in a comment or string."
(save-excursion (let ((parse-result (syntax-ppss pos)))
(or (elt parse-result 3) (elt parse-result 4)))))
(defun regent-comment-or-string-start-pos (&optional pos)
"Returns start position of string or comment which contains point.
If point is not inside string or comment, return nil."
(save-excursion (elt (syntax-ppss pos) 8)))
;; They're propertized as follows:
;; 1. generic-comment
;; 2. generic-string
;; 3. equals signs
(defconst regent-ml-begin-regexp
"\\(?:\\(?1:-\\)-\\[\\|\\(?2:\\[\\)\\)\\(?3:=*\\)\\[")
(defun regent-try-match-multiline-end (end)
"Try to match close-bracket for multiline literal around point.
Basically, detect form of close bracket from syntactic
information provided at point and re-search-forward to it."
(let ((comment-or-string-start-pos (regent-comment-or-string-start-pos)))
;; Is there a literal around point?
(and comment-or-string-start-pos
;; It is, check if the literal is a multiline open-bracket
(save-excursion
(goto-char comment-or-string-start-pos)
(looking-at regent-ml-begin-regexp))
;; Yes it is, look for it matching close-bracket. Close-bracket's
;; match group is determined by match-group of open-bracket.
(re-search-forward
(format "]%s\\(?%s:]\\)"
(match-string-no-properties 3)