python.el 132 KB
Newer Older
1
;;; python.el --- Python's flying circus support for Emacs
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
2

3
;; Copyright (C) 2003-2013 Free Software Foundation, Inc.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
4 5

;; Author: Fabián E. Gallina <fabian@anue.biz>
6
;; URL: https://github.com/fgallina/python.el
7
;; Version: 0.24.2
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
8 9 10 11
;; Maintainer: FSF
;; Created: Jul 2010
;; Keywords: languages

12
;; This file is part of GNU Emacs.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
13

14 15 16 17
;; 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 3 of the License,
;; or (at your option) any later version.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
18

19 20 21 22
;; 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.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
23 24

;; You should have received a copy of the GNU General Public License
25
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
26 27 28 29 30 31 32 33

;;; Commentary:

;; Major mode for editing Python files with some fontification and
;; indentation bits extracted from original Dave Love's python.el
;; found in GNU/Emacs.

;; Implements Syntax highlighting, Indentation, Movement, Shell
34 35
;; interaction, Shell completion, Shell virtualenv support, Pdb
;; tracking, Symbol completion, Skeletons, FFAP, Code Check, Eldoc,
36
;; Imenu.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
37 38 39 40 41 42

;; Syntax highlighting: Fontification of code is provided and supports
;; python's triple quoted strings properly.

;; Indentation: Automatic indentation with indentation cycling is
;; provided, it allows you to navigate different available levels of
43 44 45
;; indentation by hitting <tab> several times.  Also when inserting a
;; colon the `python-indent-electric-colon' command is invoked and
;; causes the current line to be dedented automatically if needed.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
46 47

;; Movement: `beginning-of-defun' and `end-of-defun' functions are
48
;; properly implemented.  There are also specialized
49 50 51 52
;; `forward-sentence' and `backward-sentence' replacements called
;; `python-nav-forward-block', `python-nav-backward-block'
;; respectively which navigate between beginning of blocks of code.
;; Extra functions `python-nav-forward-statement',
53 54 55 56
;; `python-nav-backward-statement',
;; `python-nav-beginning-of-statement', `python-nav-end-of-statement',
;; `python-nav-beginning-of-block' and `python-nav-end-of-block' are
;; included but no bound to any key.  At last but not least the
57 58 59 60 61 62 63
;; specialized `python-nav-forward-sexp' allows easy navigation
;; between code blocks.  If you prefer `cc-mode'-like `forward-sexp'
;; movement, setting `forward-sexp-function' to nil is enough, You can
;; do that using the `python-mode-hook':

;; (add-hook 'python-mode-hook
;;           (lambda () (setq forward-sexp-function nil)))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
64

65
;; Shell interaction: is provided and allows you to execute easily any
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
66 67 68
;; block of code of your current buffer in an inferior Python process.

;; Shell completion: hitting tab will try to complete the current
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
69
;; word.  Shell completion is implemented in a manner that if you
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
70 71
;; change the `python-shell-interpreter' to any other (for example
;; IPython) it should be easy to integrate another way to calculate
72
;; completions.  You just need to specify your custom
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
73
;; `python-shell-completion-setup-code' and
74
;; `python-shell-completion-string-code'.
75 76

;; Here is a complete example of the settings you would use for
77
;; iPython 0.11:
78 79 80 81 82 83

;; (setq
;;  python-shell-interpreter "ipython"
;;  python-shell-interpreter-args ""
;;  python-shell-prompt-regexp "In \\[[0-9]+\\]: "
;;  python-shell-prompt-output-regexp "Out\\[[0-9]+\\]: "
84 85
;;  python-shell-completion-setup-code
;;    "from IPython.core.completerlib import module_completion"
86
;;  python-shell-completion-module-string-code
87
;;    "';'.join(module_completion('''%s'''))\n"
88
;;  python-shell-completion-string-code
89
;;    "';'.join(get_ipython().Completer.all_completions('''%s'''))\n")
90 91

;; For iPython 0.10 everything would be the same except for
92 93
;; `python-shell-completion-string-code' and
;; `python-shell-completion-module-string-code':
94 95

;; (setq python-shell-completion-string-code
96 97
;;       "';'.join(__IP.complete('''%s'''))\n"
;;       python-shell-completion-module-string-code "")
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
98

99 100 101 102 103 104 105 106 107 108 109 110
;; Unfortunately running iPython on Windows needs some more tweaking.
;; The way you must set `python-shell-interpreter' and
;; `python-shell-interpreter-args' is as follows:

;; (setq
;;  python-shell-interpreter "C:\\Python27\\python.exe"
;;  python-shell-interpreter-args
;;  "-i C:\\Python27\\Scripts\\ipython-script.py")

;; That will spawn the iPython process correctly (Of course you need
;; to modify the paths according to your system).

111 112 113 114 115 116
;; Please note that the default completion system depends on the
;; readline module, so if you are using some Operating System that
;; bundles Python without it (like Windows) just install the
;; pyreadline from http://ipython.scipy.org/moin/PyReadline/Intro and
;; you should be good to go.

117 118
;; Shell virtualenv support: The shell also contains support for
;; virtualenvs and other special environment modifications thanks to
119 120
;; `python-shell-process-environment' and `python-shell-exec-path'.
;; These two variables allows you to modify execution paths and
121
;; environment variables to make easy for you to setup virtualenv rules
122
;; or behavior modifications when running shells.  Here is an example
123 124 125 126 127 128 129 130 131 132 133 134 135 136
;; of how to make shell processes to be run using the /path/to/env/
;; virtualenv:

;; (setq python-shell-process-environment
;;       (list
;;        (format "PATH=%s" (mapconcat
;;                           'identity
;;                           (reverse
;;                            (cons (getenv "PATH")
;;                                  '("/path/to/env/bin/")))
;;                           ":"))
;;        "VIRTUAL_ENV=/path/to/env/"))
;; (python-shell-exec-path . ("/path/to/env/bin/"))

Paul Eggert's avatar
Paul Eggert committed
137
;; Since the above is cumbersome and can be programmatically
138 139 140 141 142 143 144 145
;; calculated, the variable `python-shell-virtualenv-path' is
;; provided.  When this variable is set with the path of the
;; virtualenv to use, `process-environment' and `exec-path' get proper
;; values in order to run shells inside the specified virtualenv.  So
;; the following will achieve the same as the previous example:

;; (setq python-shell-virtualenv-path "/path/to/env/")

146 147 148 149
;; Also the `python-shell-extra-pythonpaths' variable have been
;; introduced as simple way of adding paths to the PYTHONPATH without
;; affecting existing values.

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
150 151 152 153
;; Pdb tracking: when you execute a block of code that contains some
;; call to pdb (or ipdb) it will prompt the block of code and will
;; follow the execution of pdb marking the current line with an arrow.

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
154
;; Symbol completion: you can complete the symbol at point.  It uses
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
155 156 157
;; the shell completion in background so you should run
;; `python-shell-send-buffer' from time to time to get better results.

158 159 160 161 162
;; Skeletons: 6 skeletons are provided for simple inserting of class,
;; def, for, if, try and while.  These skeletons are integrated with
;; dabbrev.  If you have `dabbrev-mode' activated and
;; `python-skeleton-autoinsert' is set to t, then whenever you type
;; the name of any of those defined and hit SPC, they will be
163 164 165 166
;; automatically expanded.  As an alternative you can use the defined
;; skeleton commands: `python-skeleton-class', `python-skeleton-def'
;; `python-skeleton-for', `python-skeleton-if', `python-skeleton-try'
;; and `python-skeleton-while'.
167

168 169 170 171
;; FFAP: You can find the filename for a given module when using ffap
;; out of the box.  This feature needs an inferior python shell
;; running.

172 173
;; Code check: Check the current file for errors with `python-check'
;; using the program defined in `python-check-command'.
174

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
175
;; Eldoc: returns documentation for object at point by using the
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
176
;; inferior python subprocess to inspect its documentation.  As you
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
177 178 179
;; might guessed you should run `python-shell-send-buffer' from time
;; to time to get better results too.

180
;; Imenu: This mode supports Imenu in its most basic form, letting it
181 182
;; build the necessary alist via `imenu-default-create-index-function'
;; by having set `imenu-extract-index-name-function' to
183 184 185
;; `python-info-current-defun' and
;; `imenu-prev-index-position-function' to
;; `python-imenu-prev-index-position'.
186

187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
;; If you used python-mode.el you probably will miss auto-indentation
;; when inserting newlines.  To achieve the same behavior you have
;; two options:

;; 1) Use GNU/Emacs' standard binding for `newline-and-indent': C-j.

;; 2) Add the following hook in your .emacs:

;; (add-hook 'python-mode-hook
;;   #'(lambda ()
;;       (define-key python-mode-map "\C-m" 'newline-and-indent)))

;; I'd recommend the first one since you'll get the same behavior for
;; all modes out-of-the-box.

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
202 203 204 205 206 207 208 209 210 211 212 213
;;; Installation:

;; Add this to your .emacs:

;; (add-to-list 'load-path "/folder/containing/file")
;; (require 'python)

;;; TODO:

;;; Code:

(require 'ansi-color)
214
(require 'comint)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
215 216

(eval-when-compile
217 218 219 220 221
  (require 'cl)
  ;; Avoid compiler warnings
  (defvar view-return-to-alist)
  (defvar compilation-error-regexp-alist)
  (defvar outline-heading-end-regexp))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
222 223 224 225 226 227 228 229 230 231 232

(autoload 'comint-mode "comint")

;;;###autoload
(add-to-list 'auto-mode-alist (cons (purecopy "\\.py\\'")  'python-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist (cons (purecopy "python") 'python-mode))

(defgroup python nil
  "Python Language's flying circus support for Emacs."
  :group 'languages
233
  :version "24.3"
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
234 235 236 237 238 239 240
  :link '(emacs-commentary-link "python"))


;;; Bindings

(defvar python-mode-map
  (let ((map (make-sparse-keymap)))
241
    ;; Movement
242 243 244
    (define-key map [remap backward-sentence] 'python-nav-backward-block)
    (define-key map [remap forward-sentence] 'python-nav-forward-block)
    (define-key map [remap backward-up-list] 'python-nav-backward-up-list)
245
    (define-key map "\C-c\C-j" 'imenu)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
246 247 248 249 250
    ;; Indent specific
    (define-key map "\177" 'python-indent-dedent-line-backspace)
    (define-key map (kbd "<backtab>") 'python-indent-dedent-line)
    (define-key map "\C-c<" 'python-indent-shift-left)
    (define-key map "\C-c>" 'python-indent-shift-right)
251
    (define-key map ":" 'python-indent-electric-colon)
252 253 254 255 256 257 258
    ;; Skeletons
    (define-key map "\C-c\C-tc" 'python-skeleton-class)
    (define-key map "\C-c\C-td" 'python-skeleton-def)
    (define-key map "\C-c\C-tf" 'python-skeleton-for)
    (define-key map "\C-c\C-ti" 'python-skeleton-if)
    (define-key map "\C-c\C-tt" 'python-skeleton-try)
    (define-key map "\C-c\C-tw" 'python-skeleton-while)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
259
    ;; Shell interaction
260
    (define-key map "\C-c\C-p" 'run-python)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
261 262 263 264 265 266
    (define-key map "\C-c\C-s" 'python-shell-send-string)
    (define-key map "\C-c\C-r" 'python-shell-send-region)
    (define-key map "\C-\M-x" 'python-shell-send-defun)
    (define-key map "\C-c\C-c" 'python-shell-send-buffer)
    (define-key map "\C-c\C-l" 'python-shell-send-file)
    (define-key map "\C-c\C-z" 'python-shell-switch-to-shell)
267 268
    ;; Some util commands
    (define-key map "\C-c\C-v" 'python-check)
269
    (define-key map "\C-c\C-f" 'python-eldoc-at-point)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
270 271
    ;; Utilities
    (substitute-key-definition 'complete-symbol 'completion-at-point
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
272
                               map global-map)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
273 274
    (easy-menu-define python-menu map "Python Mode menu"
      `("Python"
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
275 276 277 278 279 280 281 282 283 284 285 286
        :help "Python-specific Features"
        ["Shift region left" python-indent-shift-left :active mark-active
         :help "Shift region left by a single indentation step"]
        ["Shift region right" python-indent-shift-right :active mark-active
         :help "Shift region right by a single indentation step"]
        "-"
        ["Start of def/class" beginning-of-defun
         :help "Go to start of outermost definition around point"]
        ["End of def/class" end-of-defun
         :help "Go to end of definition around point"]
        ["Mark def/class" mark-defun
         :help "Mark outermost definition around point"]
287
        ["Jump to def/class" imenu
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
288
         :help "Jump to a class or function definition"]
289
        "--"
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
290
        ("Skeletons")
291
        "---"
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
        ["Start interpreter" run-python
         :help "Run inferior Python process in a separate buffer"]
        ["Switch to shell" python-shell-switch-to-shell
         :help "Switch to running inferior Python process"]
        ["Eval string" python-shell-send-string
         :help "Eval string in inferior Python session"]
        ["Eval buffer" python-shell-send-buffer
         :help "Eval buffer in inferior Python session"]
        ["Eval region" python-shell-send-region
         :help "Eval region in inferior Python session"]
        ["Eval defun" python-shell-send-defun
         :help "Eval defun in inferior Python session"]
        ["Eval file" python-shell-send-file
         :help "Eval file in inferior Python session"]
        ["Debugger" pdb :help "Run pdb under GUD"]
307
        "----"
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
308 309 310 311 312 313
        ["Check file" python-check
         :help "Check file for errors"]
        ["Help on symbol" python-eldoc-at-point
         :help "Get help on symbol at point"]
        ["Complete symbol" completion-at-point
         :help "Complete symbol before point"]))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
314 315 316 317 318 319
    map)
  "Keymap for `python-mode'.")


;;; Python specialized rx

320 321
(eval-when-compile
  (defconst python-rx-constituents
322
    `((block-start          . ,(rx symbol-start
323 324 325
                                   (or "def" "class" "if" "elif" "else" "try"
                                       "except" "finally" "for" "while" "with")
                                   symbol-end))
326
      (decorator            . ,(rx line-start (* space) ?@ (any letter ?_)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
327
                                   (* (any word ?_))))
328 329
      (defun                . ,(rx symbol-start (or "def" "class") symbol-end))
      (if-name-main         . ,(rx line-start "if" (+ space) "__name__"
330 331 332
                                   (+ space) "==" (+ space)
                                   (any ?' ?\") "__main__" (any ?' ?\")
                                   (* space) ?:))
333 334 335 336 337 338
      (symbol-name          . ,(rx (any letter ?_) (* (any word ?_))))
      (open-paren           . ,(rx (or "{" "[" "(")))
      (close-paren          . ,(rx (or "}" "]" ")")))
      (simple-operator      . ,(rx (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%)))
      ;; FIXME: rx should support (not simple-operator).
      (not-simple-operator  . ,(rx
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
339 340
                                (not
                                 (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%))))
341 342
      ;; FIXME: Use regexp-opt.
      (operator             . ,(rx (or "+" "-" "/" "&" "^" "~" "|" "*" "<" ">"
343 344
                                       "=" "%" "**" "//" "<<" ">>" "<=" "!="
                                       "==" ">=" "is" "not")))
345 346
      ;; FIXME: Use regexp-opt.
      (assignment-operator  . ,(rx (or "=" "+=" "-=" "*=" "/=" "//=" "%=" "**="
347 348 349 350 351 352 353 354 355 356 357 358 359 360
                                       ">>=" "<<=" "&=" "^=" "|=")))
      (string-delimiter . ,(rx (and
                                ;; Match even number of backslashes.
                                (or (not (any ?\\ ?\' ?\")) point
                                    ;; Quotes might be preceded by a escaped quote.
                                    (and (or (not (any ?\\)) point) ?\\
                                         (* ?\\ ?\\) (any ?\' ?\")))
                                (* ?\\ ?\\)
                                ;; Match single or triple quotes of any kind.
                                (group (or  "\"" "\"\"\"" "'" "'''"))))))
    "Additional Python specific sexps for `python-rx'")

  (defmacro python-rx (&rest regexps)
    "Python mode specialized rx macro.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
361
This variant of `rx' supports common python named REGEXPS."
362 363 364 365 366 367 368
    (let ((rx-constituents (append python-rx-constituents rx-constituents)))
      (cond ((null regexps)
             (error "No regexp"))
            ((cdr regexps)
             (rx-to-string `(and ,@regexps) t))
            (t
             (rx-to-string (car regexps) t))))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
369 370 371


;;; Font-lock and syntax
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396

(defun python-syntax-context (type &optional syntax-ppss)
  "Return non-nil if point is on TYPE using SYNTAX-PPSS.
TYPE can be `comment', `string' or `paren'.  It returns the start
character address of the specified TYPE."
  (let ((ppss (or syntax-ppss (syntax-ppss))))
    (case type
      (comment (and (nth 4 ppss) (nth 8 ppss)))
      (string (and (not (nth 4 ppss)) (nth 8 ppss)))
      (paren (nth 1 ppss))
      (t nil))))

(defun python-syntax-context-type (&optional syntax-ppss)
  "Return the context type using SYNTAX-PPSS.
The type returned can be `comment', `string' or `paren'."
  (let ((ppss (or syntax-ppss (syntax-ppss))))
    (cond
     ((nth 8 ppss) (if (nth 4 ppss) 'comment 'string))
     ((nth 1 ppss) 'paren))))

(defsubst python-syntax-comment-or-string-p ()
  "Return non-nil if point is inside 'comment or 'string."
  (nth 8 (syntax-ppss)))

(define-obsolete-function-alias
397
  'python-info-ppss-context #'python-syntax-context "24.3")
398 399

(define-obsolete-function-alias
400
  'python-info-ppss-context-type #'python-syntax-context-type "24.3")
401 402 403

(define-obsolete-function-alias
  'python-info-ppss-comment-or-string-p
404
  #'python-syntax-comment-or-string-p "24.3")
405

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
406 407 408
(defvar python-font-lock-keywords
  ;; Keywords
  `(,(rx symbol-start
409 410 411 412 413 414 415 416 417 418 419 420
         (or
          "and" "del" "from" "not" "while" "as" "elif" "global" "or" "with"
          "assert" "else" "if" "pass" "yield" "break" "except" "import" "class"
          "in" "raise" "continue" "finally" "is" "return" "def" "for" "lambda"
          "try"
          ;; Python 2:
          "print" "exec"
          ;; Python 3:
          ;; False, None, and True are listed as keywords on the Python 3
          ;; documentation, but since they also qualify as constants they are
          ;; fontified like that in order to keep font-lock consistent between
          ;; Python versions.
421 422 423
          "nonlocal"
          ;; Extra:
          "self")
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
424 425 426 427 428 429 430 431
         symbol-end)
    ;; functions
    (,(rx symbol-start "def" (1+ space) (group (1+ (or word ?_))))
     (1 font-lock-function-name-face))
    ;; classes
    (,(rx symbol-start "class" (1+ space) (group (1+ (or word ?_))))
     (1 font-lock-type-face))
    ;; Constants
432
    (,(rx symbol-start
433 434 435 436 437
          (or
           "Ellipsis" "False" "None" "NotImplemented" "True" "__debug__"
           ;; copyright, license, credits, quit and exit are added by the site
           ;; module and they are not intended to be used in programs
           "copyright" "credits" "exit" "license" "quit")
438
          symbol-end) . font-lock-constant-face)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
439 440 441 442 443 444
    ;; Decorators.
    (,(rx line-start (* (any " \t")) (group "@" (1+ (or word ?_))
                                            (0+ "." (1+ (or word ?_)))))
     (1 font-lock-type-face))
    ;; Builtin Exceptions
    (,(rx symbol-start
445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462
          (or
           "ArithmeticError" "AssertionError" "AttributeError" "BaseException"
           "DeprecationWarning" "EOFError" "EnvironmentError" "Exception"
           "FloatingPointError" "FutureWarning" "GeneratorExit" "IOError"
           "ImportError" "ImportWarning" "IndexError" "KeyError"
           "KeyboardInterrupt" "LookupError" "MemoryError" "NameError"
           "NotImplementedError" "OSError" "OverflowError"
           "PendingDeprecationWarning" "ReferenceError" "RuntimeError"
           "RuntimeWarning" "StopIteration" "SyntaxError" "SyntaxWarning"
           "SystemError" "SystemExit" "TypeError" "UnboundLocalError"
           "UnicodeDecodeError" "UnicodeEncodeError" "UnicodeError"
           "UnicodeTranslateError" "UnicodeWarning" "UserWarning" "VMSError"
           "ValueError" "Warning" "WindowsError" "ZeroDivisionError"
           ;; Python 2:
           "StandardError"
           ;; Python 3:
           "BufferError" "BytesWarning" "IndentationError" "ResourceWarning"
           "TabError")
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
463 464
          symbol-end) . font-lock-type-face)
    ;; Builtins
465
    (,(rx symbol-start
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483
          (or
           "abs" "all" "any" "bin" "bool" "callable" "chr" "classmethod"
           "compile" "complex" "delattr" "dict" "dir" "divmod" "enumerate"
           "eval" "filter" "float" "format" "frozenset" "getattr" "globals"
           "hasattr" "hash" "help" "hex" "id" "input" "int" "isinstance"
           "issubclass" "iter" "len" "list" "locals" "map" "max" "memoryview"
           "min" "next" "object" "oct" "open" "ord" "pow" "print" "property"
           "range" "repr" "reversed" "round" "set" "setattr" "slice" "sorted"
           "staticmethod" "str" "sum" "super" "tuple" "type" "vars" "zip"
           "__import__"
           ;; Python 2:
           "basestring" "cmp" "execfile" "file" "long" "raw_input" "reduce"
           "reload" "unichr" "unicode" "xrange" "apply" "buffer" "coerce"
           "intern"
           ;; Python 3:
           "ascii" "bytearray" "bytes" "exec"
           ;; Extra:
           "__all__" "__doc__" "__name__" "__package__")
484
          symbol-end) . font-lock-builtin-face)
Paul Eggert's avatar
Paul Eggert committed
485
    ;; assignments
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
486 487
    ;; support for a = b = c = 5
    (,(lambda (limit)
488 489
        (let ((re (python-rx (group (+ (any word ?. ?_)))
                             (? ?\[ (+ (not (any  ?\]))) ?\]) (* space)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
490 491
                             assignment-operator)))
          (when (re-search-forward re limit t)
492
            (while (and (python-syntax-context 'paren)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
493
                        (re-search-forward re limit t)))
494
            (if (and (not (python-syntax-context 'paren))
495
                     (not (equal (char-after (point-marker)) ?=)))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
496 497 498 499 500 501 502 503 504 505 506
                t
              (set-match-data nil)))))
     (1 font-lock-variable-name-face nil nil))
    ;; support for a, b, c = (1, 2, 3)
    (,(lambda (limit)
        (let ((re (python-rx (group (+ (any word ?. ?_))) (* space)
                             (* ?, (* space) (+ (any word ?. ?_)) (* space))
                             ?, (* space) (+ (any word ?. ?_)) (* space)
                             assignment-operator)))
          (when (and (re-search-forward re limit t)
                     (goto-char (nth 3 (match-data))))
507
            (while (and (python-syntax-context 'paren)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
508 509
                        (re-search-forward re limit t))
              (goto-char (nth 3 (match-data))))
510
            (if (not (python-syntax-context 'paren))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
511 512 513 514
                t
              (set-match-data nil)))))
     (1 font-lock-variable-name-face nil nil))))

515 516
(defconst python-syntax-propertize-function
  (syntax-propertize-rules
517
   ((python-rx string-delimiter)
518
    (0 (ignore (python-syntax-stringify))))))
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533

(defsubst python-syntax-count-quotes (quote-char &optional point limit)
  "Count number of quotes around point (max is 3).
QUOTE-CHAR is the quote char to count.  Optional argument POINT is
the point where scan starts (defaults to current point) and LIMIT
is used to limit the scan."
  (let ((i 0))
    (while (and (< i 3)
                (or (not limit) (< (+ point i) limit))
                (eq (char-after (+ point i)) quote-char))
      (incf i))
    i))

(defun python-syntax-stringify ()
  "Put `syntax-table' property correctly on single/triple quotes."
534
  (let* ((num-quotes (length (match-string-no-properties 1)))
535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
         (ppss (prog2
                   (backward-char num-quotes)
                   (syntax-ppss)
                 (forward-char num-quotes)))
         (string-start (and (not (nth 4 ppss)) (nth 8 ppss)))
         (quote-starting-pos (- (point) num-quotes))
         (quote-ending-pos (point))
         (num-closing-quotes
          (and string-start
               (python-syntax-count-quotes
                (char-before) string-start quote-starting-pos))))
    (cond ((and string-start (= num-closing-quotes 0))
           ;; This set of quotes doesn't match the string starting
           ;; kind. Do nothing.
           nil)
          ((not string-start)
           ;; This set of quotes delimit the start of a string.
           (put-text-property quote-starting-pos (1+ quote-starting-pos)
                              'syntax-table (string-to-syntax "|")))
          ((= num-quotes num-closing-quotes)
           ;; This set of quotes delimit the end of a string.
           (put-text-property (1- quote-ending-pos) quote-ending-pos
                              'syntax-table (string-to-syntax "|")))
          ((> num-quotes num-closing-quotes)
           ;; This may only happen whenever a triple quote is closing
           ;; a single quoted string. Add string delimiter syntax to
           ;; all three quotes.
           (put-text-property quote-starting-pos quote-ending-pos
                              'syntax-table (string-to-syntax "|"))))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
564 565 566 567 568 569

(defvar python-mode-syntax-table
  (let ((table (make-syntax-table)))
    ;; Give punctuation syntax to ASCII that normally has symbol
    ;; syntax or has word syntax and isn't a letter.
    (let ((symbol (string-to-syntax "_"))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
570
          (sst (standard-syntax-table)))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
571
      (dotimes (i 128)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
572 573 574
        (unless (= i ?_)
          (if (equal symbol (aref sst i))
              (modify-syntax-entry i "." table)))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
    (modify-syntax-entry ?$ "." table)
    (modify-syntax-entry ?% "." table)
    ;; exceptions
    (modify-syntax-entry ?# "<" table)
    (modify-syntax-entry ?\n ">" table)
    (modify-syntax-entry ?' "\"" table)
    (modify-syntax-entry ?` "$" table)
    table)
  "Syntax table for Python files.")

(defvar python-dotty-syntax-table
  (let ((table (make-syntax-table python-mode-syntax-table)))
    (modify-syntax-entry ?. "w" table)
    (modify-syntax-entry ?_ "w" table)
    table)
  "Dotty syntax table for Python files.
It makes underscores and dots word constituent chars.")


;;; Indentation

(defcustom python-indent-offset 4
  "Default indentation offset for Python."
  :group 'python
  :type 'integer
  :safe 'integerp)

(defcustom python-indent-guess-indent-offset t
  "Non-nil tells Python mode to guess `python-indent-offset' value."
  :type 'boolean
605 606
  :group 'python
  :safe 'booleanp)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
607

608 609 610 611 612 613
(defcustom python-indent-trigger-commands
  '(indent-for-tab-command yas-expand yas/expand)
  "Commands that might trigger a `python-indent-line' call."
  :type '(repeat symbol)
  :group 'python)

614
(define-obsolete-variable-alias
615
  'python-indent 'python-indent-offset "24.3")
616 617

(define-obsolete-variable-alias
618
  'python-guess-indent 'python-indent-guess-indent-offset "24.3")
619

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
620 621 622 623 624 625 626 627 628 629 630 631
(defvar python-indent-current-level 0
  "Current indentation level `python-indent-line-function' is using.")

(defvar python-indent-levels '(0)
  "Levels of indentation available for `python-indent-line-function'.")

(defvar python-indent-dedenters '("else" "elif" "except" "finally")
  "List of words that should be dedented.
These make `python-indent-calculate-indentation' subtract the value of
`python-indent-offset'.")

(defun python-indent-guess-indent-offset ()
632
  "Guess and set `python-indent-offset' for the current buffer."
633
  (interactive)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
634 635 636 637 638 639 640 641 642
  (save-excursion
    (save-restriction
      (widen)
      (goto-char (point-min))
      (let ((block-end))
        (while (and (not block-end)
                    (re-search-forward
                     (python-rx line-start block-start) nil t))
          (when (and
643
                 (not (python-syntax-context-type))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
                 (progn
                   (goto-char (line-end-position))
                   (python-util-forward-comment -1)
                   (if (equal (char-before) ?:)
                       t
                     (forward-line 1)
                     (when (python-info-block-continuation-line-p)
                       (while (and (python-info-continuation-line-p)
                                   (not (eobp)))
                         (forward-line 1))
                       (python-util-forward-comment -1)
                       (when (equal (char-before) ?:)
                         t)))))
            (setq block-end (point-marker))))
        (let ((indentation
               (when block-end
                 (goto-char block-end)
                 (python-util-forward-comment)
                 (current-indentation))))
          (if indentation
664
              (set (make-local-variable 'python-indent-offset) indentation)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
665 666
            (message "Can't guess python-indent-offset, using defaults: %s"
                     python-indent-offset)))))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
667

668 669 670 671
(defun python-indent-context ()
  "Get information on indentation context.
Context information is returned with a cons with the form:
    \(STATUS . START)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686

Where status can be any of the following symbols:
 * inside-paren: If point in between (), {} or []
 * inside-string: If point is inside a string
 * after-backslash: Previous line ends in a backslash
 * after-beginning-of-block: Point is after beginning of block
 * after-line: Point is after normal line
 * no-indent: Point is at beginning of buffer or other special case
START is the buffer position where the sexp starts."
  (save-restriction
    (widen)
    (let ((ppss (save-excursion (beginning-of-line) (syntax-ppss)))
          (start))
      (cons
       (cond
687
        ;; Beginning of buffer
688 689 690
        ((save-excursion
           (goto-char (line-beginning-position))
           (bobp))
691
         'no-indent)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
692
        ;; Inside string
693
        ((setq start (python-syntax-context 'string ppss))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
694
         'inside-string)
695 696 697
        ;; Inside a paren
        ((setq start (python-syntax-context 'paren ppss))
         'inside-paren)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
698
        ;; After backslash
699 700
        ((setq start (when (not (or (python-syntax-context 'string ppss)
                                    (python-syntax-context 'comment ppss)))
701 702 703
                       (let ((line-beg-pos (line-number-at-pos)))
                         (python-info-line-ends-backslash-p
                          (1- line-beg-pos)))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
704 705 706
         'after-backslash)
        ;; After beginning of block
        ((setq start (save-excursion
707 708 709 710 711 712 713 714 715 716
                       (when (progn
                               (back-to-indentation)
                               (python-util-forward-comment -1)
                               (equal (char-before) ?:))
                         ;; Move to the first block start that's not in within
                         ;; a string, comment or paren and that's not a
                         ;; continuation line.
                         (while (and (re-search-backward
                                      (python-rx block-start) nil t)
                                     (or
717
                                      (python-syntax-context-type)
718 719
                                      (python-info-continuation-line-p))))
                         (when (looking-at (python-rx block-start))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
720 721 722 723
                           (point-marker)))))
         'after-beginning-of-block)
        ;; After normal line
        ((setq start (save-excursion
724
                       (back-to-indentation)
725
                       (skip-chars-backward (rx (or whitespace ?\n)))
726
                       (python-nav-beginning-of-statement)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
                       (point-marker)))
         'after-line)
        ;; Do not indent
        (t 'no-indent))
       start))))

(defun python-indent-calculate-indentation ()
  "Calculate correct indentation offset for the current line."
  (let* ((indentation-context (python-indent-context))
         (context-status (car indentation-context))
         (context-start (cdr indentation-context)))
    (save-restriction
      (widen)
      (save-excursion
        (case context-status
          ('no-indent 0)
743 744
          ;; When point is after beginning of block just add one level
          ;; of indentation relative to the context-start
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
745 746 747
          ('after-beginning-of-block
           (goto-char context-start)
           (+ (current-indentation) python-indent-offset))
748 749 750
          ;; When after a simple line just use previous line
          ;; indentation, in the case current line starts with a
          ;; `python-indent-dedenters' de-indent one level.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
751 752 753 754 755 756 757 758 759 760
          ('after-line
           (-
            (save-excursion
              (goto-char context-start)
              (current-indentation))
            (if (progn
                  (back-to-indentation)
                  (looking-at (regexp-opt python-indent-dedenters)))
                python-indent-offset
              0)))
761 762 763
          ;; When inside of a string, do nothing. just use the current
          ;; indentation.  XXX: perhaps it would be a good idea to
          ;; invoke standard text indentation here
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
764 765 766
          ('inside-string
           (goto-char context-start)
           (current-indentation))
Paul Eggert's avatar
Paul Eggert committed
767
          ;; After backslash we have several possibilities.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
768
          ('after-backslash
769 770 771 772 773 774 775
           (cond
            ;; Check if current line is a dot continuation.  For this
            ;; the current line must start with a dot and previous
            ;; line must contain a dot too.
            ((save-excursion
               (back-to-indentation)
               (when (looking-at "\\.")
776 777 778 779 780
                 ;; If after moving one line back point is inside a paren it
                 ;; needs to move back until it's not anymore
                 (while (prog2
                            (forward-line -1)
                            (and (not (bobp))
781
                                 (python-syntax-context 'paren))))
782
                 (goto-char (line-end-position))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
783 784
                 (while (and (re-search-backward
                              "\\." (line-beginning-position) t)
785
                             (python-syntax-context-type)))
786
                 (if (and (looking-at "\\.")
787
                          (not (python-syntax-context-type)))
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
                     ;; The indentation is the same column of the
                     ;; first matching dot that's not inside a
                     ;; comment, a string or a paren
                     (current-column)
                   ;; No dot found on previous line, just add another
                   ;; indentation level.
                   (+ (current-indentation) python-indent-offset)))))
            ;; Check if prev line is a block continuation
            ((let ((block-continuation-start
                    (python-info-block-continuation-line-p)))
               (when block-continuation-start
                 ;; If block-continuation-start is set jump to that
                 ;; marker and use first column after the block start
                 ;; as indentation value.
                 (goto-char block-continuation-start)
                 (re-search-forward
                  (python-rx block-start (* space))
                  (line-end-position) t)
                 (current-column))))
            ;; Check if current line is an assignment continuation
            ((let ((assignment-continuation-start
                    (python-info-assignment-continuation-line-p)))
               (when assignment-continuation-start
                 ;; If assignment-continuation is set jump to that
                 ;; marker and use first column after the assignment
                 ;; operator as indentation value.
                 (goto-char assignment-continuation-start)
                 (current-column))))
            (t
             (forward-line -1)
Paul Eggert's avatar
Paul Eggert committed
818
             (goto-char (python-info-beginning-of-backslash))
819 820 821
             (if (save-excursion
                   (and
                    (forward-line -1)
822
                    (goto-char
Paul Eggert's avatar
Paul Eggert committed
823
                     (or (python-info-beginning-of-backslash) (point)))
824 825 826 827 828 829 830 831 832 833
                    (python-info-line-ends-backslash-p)))
                 ;; The two previous lines ended in a backslash so we must
                 ;; respect previous line indentation.
                 (current-indentation)
               ;; What happens here is that we are dealing with the second
               ;; line of a backslash continuation, in that case we just going
               ;; to add one indentation level.
               (+ (current-indentation) python-indent-offset)))))
          ;; When inside a paren there's a need to handle nesting
          ;; correctly
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
834
          ('inside-paren
835
           (cond
Paul Eggert's avatar
Paul Eggert committed
836
            ;; If current line closes the outermost open paren use the
837 838 839 840 841 842
            ;; current indentation of the context-start line.
            ((save-excursion
               (skip-syntax-forward "\s" (line-end-position))
               (when (and (looking-at (regexp-opt '(")" "]" "}")))
                          (progn
                            (forward-char 1)
843
                            (not (python-syntax-context 'paren))))
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
                 (goto-char context-start)
                 (current-indentation))))
            ;; If open paren is contained on a line by itself add another
            ;; indentation level, else look for the first word after the
            ;; opening paren and use it's column position as indentation
            ;; level.
            ((let* ((content-starts-in-newline)
                    (indent
                     (save-excursion
                       (if (setq content-starts-in-newline
                                 (progn
                                   (goto-char context-start)
                                   (forward-char)
                                   (save-restriction
                                     (narrow-to-region
                                      (line-beginning-position)
                                      (line-end-position))
                                     (python-util-forward-comment))
                                   (looking-at "$")))
                           (+ (current-indentation) python-indent-offset)
                         (current-column)))))
               ;; Adjustments
               (cond
                ;; If current line closes a nested open paren de-indent one
                ;; level.
                ((progn
870
                   (back-to-indentation)
871 872 873 874 875 876 877 878 879 880 881 882 883
                   (looking-at (regexp-opt '(")" "]" "}"))))
                 (- indent python-indent-offset))
                ;; If the line of the opening paren that wraps the current
                ;; line starts a block add another level of indentation to
                ;; follow new pep8 recommendation. See: http://ur1.ca/5rojx
                ((save-excursion
                   (when (and content-starts-in-newline
                              (progn
                                (goto-char context-start)
                                (back-to-indentation)
                                (looking-at (python-rx block-start))))
                     (+ indent python-indent-offset))))
                (t indent)))))))))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
884 885 886 887 888 889

(defun python-indent-calculate-levels ()
  "Calculate `python-indent-levels' and reset `python-indent-current-level'."
  (let* ((indentation (python-indent-calculate-indentation))
         (remainder (% indentation python-indent-offset))
         (steps (/ (- indentation remainder) python-indent-offset)))
890
    (setq python-indent-levels (list 0))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
891
    (dotimes (step steps)
892
      (push (* python-indent-offset (1+ step)) python-indent-levels))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
893
    (when (not (eq 0 remainder))
894
      (push (+ (* python-indent-offset steps) remainder) python-indent-levels))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
895 896 897 898 899 900 901 902 903 904 905 906 907
    (setq python-indent-levels (nreverse python-indent-levels))
    (setq python-indent-current-level (1- (length python-indent-levels)))))

(defun python-indent-toggle-levels ()
  "Toggle `python-indent-current-level' over `python-indent-levels'."
  (setq python-indent-current-level (1- python-indent-current-level))
  (when (< python-indent-current-level 0)
    (setq python-indent-current-level (1- (length python-indent-levels)))))

(defun python-indent-line (&optional force-toggle)
  "Internal implementation of `python-indent-line-function'.
Uses the offset calculated in
`python-indent-calculate-indentation' and available levels
908 909
indicated by the variable `python-indent-levels' to set the
current indentation.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
910

911 912 913 914 915 916 917 918 919 920 921 922 923
When the variable `last-command' is equal to one of the symbols
inside `python-indent-trigger-commands' or FORCE-TOGGLE is
non-nil it cycles levels indicated in the variable
`python-indent-levels' by setting the current level in the
variable `python-indent-current-level'.

When the variable `last-command' is not equal to one of the
symbols inside `python-indent-trigger-commands' and FORCE-TOGGLE
is nil it calculates possible indentation levels and saves it in
the variable `python-indent-levels'.  Afterwards it sets the
variable `python-indent-current-level' correctly so offset is
equal to (`nth' `python-indent-current-level'
`python-indent-levels')"
924
  (or
925
   (and (or (and (memq this-command python-indent-trigger-commands)
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
                 (eq last-command this-command))
            force-toggle)
        (not (equal python-indent-levels '(0)))
        (or (python-indent-toggle-levels) t))
   (python-indent-calculate-levels))
  (let* ((starting-pos (point-marker))
         (indent-ending-position
          (+ (line-beginning-position) (current-indentation)))
         (follow-indentation-p
          (or (bolp)
              (and (<= (line-beginning-position) starting-pos)
                   (>= indent-ending-position starting-pos))))
         (next-indent (nth python-indent-current-level python-indent-levels)))
    (unless (= next-indent (current-indentation))
      (beginning-of-line)
      (delete-horizontal-space)
      (indent-to next-indent)
      (goto-char starting-pos))
    (and follow-indentation-p (back-to-indentation)))
945
  (python-info-closing-block-message))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
946 947 948

(defun python-indent-line-function ()
  "`indent-line-function' for Python mode.
949
See `python-indent-line' for details."
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
950 951 952
  (python-indent-line))

(defun python-indent-dedent-line ()
953
  "De-indent current line."
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
954
  (interactive "*")
955
  (when (and (not (python-syntax-comment-or-string-p))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
956 957 958 959 960 961 962 963
             (<= (point-marker) (save-excursion
                                  (back-to-indentation)
                                  (point-marker)))
             (> (current-column) 0))
    (python-indent-line t)
    t))

(defun python-indent-dedent-line-backspace (arg)
964
  "De-indent current line.
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
965
Argument ARG is passed to `backward-delete-char-untabify' when
966
point is  not in between the indentation."
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
967 968 969
  (interactive "*p")
  (when (not (python-indent-dedent-line))
    (backward-delete-char-untabify arg)))
970
(put 'python-indent-dedent-line-backspace 'delete-selection 'supersede)
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
971 972 973 974 975

(defun python-indent-region (start end)
  "Indent a python region automagically.

Called from a program, START and END specify the region to indent."
976 977 978 979 980 981 982 983 984 985 986 987 988
  (let ((deactivate-mark nil))
    (save-excursion
      (goto-char end)
      (setq end (point-marker))
      (goto-char start)
      (or (bolp) (forward-line 1))
      (while (< (point) end)
        (or (and (bolp) (eolp))
            (let (word)
              (forward-line -1)
              (back-to-indentation)
              (setq word (current-word))
              (forward-line 1)
989 990 991 992 993 994 995 996 997 998
              (when (and word
                         ;; Don't mess with strings, unless it's the
                         ;; enclosing set of quotes.
                         (or (not (python-syntax-context 'string))
                             (eq
                              (syntax-after
                               (+ (1- (point))
                                  (current-indentation)
                                  (python-syntax-count-quotes (char-after) (point))))
                              (string-to-syntax "|"))))
999 1000 1001 1002 1003
                (beginning-of-line)
                (delete-horizontal-space)
                (indent-to (python-indent-calculate-indentation)))))
        (forward-line 1))
      (move-marker end nil))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1004 1005 1006

(defun python-indent-shift-left (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
1007 1008 1009 1010
COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie.  An error is signaled if
any lines in the region are indented less than COUNT columns."
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1011 1012 1013 1014 1015 1016 1017 1018
  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
  (if count
      (setq count (prefix-numeric-value count))
    (setq count python-indent-offset))
  (when (> count 0)
1019 1020 1021 1022 1023 1024 1025 1026 1027
    (let ((deactivate-mark nil))
      (save-excursion
        (goto-char start)
        (while (< (point) end)
          (if (and (< (current-indentation) count)
                   (not (looking-at "[ \t]*$")))
              (error "Can't shift all lines enough"))
          (forward-line))
        (indent-rigidly start end (- count))))))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1028 1029 1030 1031 1032

(add-to-list 'debug-ignored-errors "^Can't shift all lines enough")

(defun python-indent-shift-right (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
1033 1034 1035
COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie."
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1036 1037 1038 1039
  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
1040 1041 1042 1043 1044
  (let ((deactivate-mark nil))
    (if count
        (setq count (prefix-numeric-value count))
      (setq count python-indent-offset))
    (indent-rigidly start end count)))
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1045

1046
(defun python-indent-electric-colon (arg)
1047 1048 1049
  "Insert a colon and maybe de-indent the current line.
With numeric ARG, just insert that many colons.  With
\\[universal-argument], just insert a single colon."
1050 1051
  (interactive "*P")
  (self-insert-command (if (not (integerp arg)) 1 arg))
1052 1053 1054
  (when (and (not arg)
             (eolp)
             (not (equal ?: (char-after (- (point-marker) 2))))
1055
             (not (python-syntax-comment-or-string-p)))
1056 1057
    (let ((indentation (current-indentation))
          (calculated-indentation (python-indent-calculate-indentation)))
1058
      (python-info-closing-block-message)
1059 1060 1061
      (when (> indentation calculated-indentation)
        (save-excursion
          (indent-line-to calculated-indentation)
1062
          (when (not (python-info-closing-block-message))
1063
            (indent-line-to indentation)))))))
1064 1065
(put 'python-indent-electric-colon 'delete-selection t)

1066 1067 1068 1069 1070 1071 1072 1073 1074
(defun python-indent-post-self-insert-function ()
  "Adjust closing paren line indentation after a char is added.
This function is intended to be added to the
`post-self-insert-hook.'  If a line renders a paren alone, after
adding a char before it, the line will be re-indented
automatically if needed."
  (when (and (eq (char-before) last-command-event)
             (not (bolp))
             (memq (char-after) '(?\) ?\] ?\})))
1075 1076 1077 1078
    (save-excursion
      (goto-char (line-beginning-position))
      ;; If after going to the beginning of line the point
      ;; is still inside a paren it's ok to do the trick
1079
      (when (python-syntax-context 'paren)
1080 1081 1082
        (let ((indentation (python-indent-calculate-indentation)))
          (when (< (current-indentation) indentation)
            (indent-line-to indentation)))))))
1083

Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1084 1085 1086

;;; Navigation

1087
(defvar python-nav-beginning-of-defun-regexp
1088
  (python-rx line-start (* space) defun (+ space) (group symbol-name))
1089
  "Regexp matching class or function definition.
1090 1091
The name of the defun should be grouped so it can be retrieved
via `match-string'.")
Fabián Ezequiel Gallina's avatar
Fabián Ezequiel Gallina committed
1092

1093 1094 1095
(defun python-nav--beginning-of-defun (&optional arg)
  "Internal implementation of `python-nav-beginning-of-defun'.
With positive ARG search backwards, else search forwards."
1096 1097 1098 1099 1100 1101 1102
  (when (or (null arg) (= arg 0)) (setq arg 1))
  (let* ((re-search-fn (if (> arg 0)
                           #'re-search-backward
                         #'re-search-forward))
         (line-beg-pos (line-beginning-position))
         (line-content-start (+ line-beg-pos (current-indentation)))
         (pos (point-marker))
1103 1104 1105
         (beg-indentation
          (and (> arg 0)
               (save-excursion
1106 1107 1108 1109 1110 1111
                 (while (and
                         (not (python-info-looking-at-beginning-of-defun))
                         (python-nav-backward-block)))
                 (or (and (python-info-looking-at-beginning-of-defun)
                          (+ (current-indentation) python-indent-offset))
                     0))))
1112 1113 1114 1115 1116 1117 1118
         (found
          (progn
            (when (and (< arg 0)
                       (python-info-looking-at-beginning-of-defun))
              (end-of-line 1))
            (while (and (funcall re-search-fn
                                 python-nav-beginning-of-defun-regexp nil t)
1119 1120 1121 1122 1123 1124
                        (or (python-syntax-context-type)
                            ;; Handle nested defuns when moving
                            ;; backwards by checking indentation.
                            (and (> arg 0)
                                 (not (= (current-indentation) 0))
                                 (>= (current-indentation) beg-indentation)))))
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
            (and (python-info-looking-at-beginning-of-defun)
                 (or (not (= (line-number-at-pos pos)
                             (line-number-at-pos)))
                     (and (>= (point) line-beg-pos)
                          (<= (point) line-content-start)
                          (> pos line-content-start)))))))
    (if found
        (or (beginning-of-line 1) t)
      (and (goto-char pos) nil))))

1135 1136 1137 1138 1139 1140 1141
(defun python-nav-beginning-of-defun (&optional arg)
  "Move point to `beginning-of-defun'.
With positive ARG search backwards else search forward.  When ARG
is nil or 0 defaults to 1.  When searching backwards nested
defuns are handled with care depending on current point
position.  Return non-nil if point is moved to
`beginning-of-defun'."
1142
  (when (or (null arg) (= arg 0)) (setq arg 1))
</