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;;; python.el --- Python's flying circus support for Emacs -*- lexical-binding: t -*-
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;; Copyright (C) 2003-2015 Free Software Foundation, Inc.
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;; Author: Fabián E. Gallina <fabian@anue.biz>
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;; URL: https://github.com/fgallina/python.el
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;; Version: 0.24.5
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;; Maintainer: emacs-devel@gnu.org
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;; Created: Jul 2010
;; Keywords: languages

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;; This file is part of GNU Emacs.
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;; 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.
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;; 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.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; 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
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;; interaction, Shell completion, Shell virtualenv support, Shell
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;; package support, Shell syntax highlighting, Pdb tracking, Symbol
;; completion, Skeletons, FFAP, Code Check, Eldoc, Imenu.
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;; 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
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;; indentation by hitting <tab> several times.  Also electric-indent-mode
;; is supported such that when inserting a colon the current line is
;; dedented automatically if needed.
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;; Movement: `beginning-of-defun' and `end-of-defun' functions are
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;; properly implemented.  There are also specialized
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;; `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',
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;; `python-nav-backward-statement',
;; `python-nav-beginning-of-statement', `python-nav-end-of-statement',
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;; `python-nav-beginning-of-block', `python-nav-end-of-block' and
;; `python-nav-if-name-main' are included but no bound to any key.  At
;; last but not least the 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':
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;; (add-hook 'python-mode-hook
;;           (lambda () (setq forward-sexp-function nil)))
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;; Shell interaction: is provided and allows opening Python shells
;; inside Emacs and executing any block of code of your current buffer
;; in that inferior Python process.

;; Besides that only the standard CPython (2.x and 3.x) shell and
;; IPython are officially supported out of the box, the interaction
;; should support any other readline based Python shells as well
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;; (e.g. Jython and PyPy have been reported to work).  You can change
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;; your default interpreter and commandline arguments by setting the
;; `python-shell-interpreter' and `python-shell-interpreter-args'
;; variables.  This example enables IPython globally:

;; (setq python-shell-interpreter "ipython"
;;       python-shell-interpreter-args "-i")

;; Using the "console" subcommand to start IPython in server-client
;; mode is known to fail intermittently due a bug on IPython itself
;; (see URL `http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18052#27').
;; There seems to be a race condition in the IPython server (A.K.A
;; kernel) when code is sent while it is still initializing, sometimes
;; causing the shell to get stalled.  With that said, if an IPython
;; kernel is already running, "console --existing" seems to work fine.

;; Running IPython on Windows needs more tweaking.  The way you should
;; set `python-shell-interpreter' and `python-shell-interpreter-args'
;; is as follows (of course you need to modify the paths according to
;; your system):

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

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;; Missing or delayed output used to happen due to differences between
;; Operating Systems' pipe buffering (e.g. CPython 3.3.4 in Windows 7.
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;; See URL `http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17304').  To
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;; avoid this, the `python-shell-unbuffered' defaults to non-nil and
;; controls whether `python-shell-calculate-process-environment'
;; should set the "PYTHONUNBUFFERED" environment variable on startup:
;; See URL `https://docs.python.org/3/using/cmdline.html#cmdoption-u'.
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;; The interaction relies upon having prompts for input (e.g. ">>> "
;; and "... " in standard Python shell) and output (e.g. "Out[1]: " in
;; IPython) detected properly.  Failing that Emacs may hang but, in
;; the case that happens, you can recover with \\[keyboard-quit].  To
;; avoid this issue, a two-step prompt autodetection mechanism is
;; provided: the first step is manual and consists of a collection of
;; regular expressions matching common prompts for Python shells
;; stored in `python-shell-prompt-input-regexps' and
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;; `python-shell-prompt-output-regexps', and dir-local friendly vars
;; `python-shell-prompt-regexp', `python-shell-prompt-block-regexp',
;; `python-shell-prompt-output-regexp' which are appended to the
;; former automatically when a shell spawns; the second step is
;; automatic and depends on the `python-shell-prompt-detect' helper
;; function.  See its docstring for details on global variables that
;; modify its behavior.
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;; Shell completion: hitting tab will try to complete the current
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;; word.  The two built-in mechanisms depend on Python's readline
;; module: the "native" completion is tried first and is activated
;; when `python-shell-completion-native-enable' is non-nil, the
;; current `python-shell-interpreter' is not a member of the
;; `python-shell-completion-native-disabled-interpreters' variable and
;; `python-shell-completion-native-setup' succeeds; the "fallback" or
;; "legacy" mechanism works by executing Python code in the background
;; and enables auto-completion for shells that do not support
;; receiving escape sequences (with some limitations, i.e. completion
;; in blocks does not work).  The code executed for the "fallback"
;; completion can be found in `python-shell-completion-setup-code' and
;; `python-shell-completion-string-code' variables.  Their default
;; values enable completion for both CPython and IPython, and probably
;; any readline based shell (it's known to work with PyPy).  If your
;; Python installation lacks readline (like CPython for Windows),
;; installing pyreadline (URL `http://ipython.org/pyreadline.html')
;; should suffice.  To troubleshoot why you are not getting any
;; completions, you can try the following in your Python shell:
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;; >>> import readline, rlcompleter

;; If you see an error, then you need to either install pyreadline or
;; setup custom code that avoids that dependency.
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;; Shell virtualenv support: The shell also contains support for
;; virtualenvs and other special environment modifications thanks to
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;; `python-shell-process-environment' and `python-shell-exec-path'.
;; These two variables allows you to modify execution paths and
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;; environment variables to make easy for you to setup virtualenv rules
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;; or behavior modifications when running shells.  Here is an example
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;; 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/"))

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;; Since the above is cumbersome and can be programmatically
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;; calculated, the variable `python-shell-virtualenv-root' is
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;; 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:

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;; (setq python-shell-virtualenv-root "/path/to/env/")
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;; Also the `python-shell-extra-pythonpaths' variable have been
;; introduced as simple way of adding paths to the PYTHONPATH without
;; affecting existing values.

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;; Shell package support: you can enable a package in the current
;; shell so that relative imports work properly using the
;; `python-shell-package-enable' command.

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;; Shell syntax highlighting: when enabled current input in shell is
;; highlighted.  The variable `python-shell-font-lock-enable' controls
;; activation of this feature globally when shells are started.
;; Activation/deactivation can be also controlled on the fly via the
;; `python-shell-font-lock-toggle' command.

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;; 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.

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;; Symbol completion: you can complete the symbol at point.  It uses
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;; the shell completion in background so you should run
;; `python-shell-send-buffer' from time to time to get better results.

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;; Skeletons: skeletons are provided for simple inserting of things like class,
;; def, for, import, if, try, and while.  These skeletons are
;; integrated with abbrev.  If you have `abbrev-mode' activated and
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;; `python-skeleton-autoinsert' is set to t, then whenever you type
;; the name of any of those defined and hit SPC, they will be
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;; automatically expanded.  As an alternative you can use the defined
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;; skeleton commands: `python-skeleton-<foo>'.
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;; 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.

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;; Code check: Check the current file for errors with `python-check'
;; using the program defined in `python-check-command'.
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;; Eldoc: returns documentation for object at point by using the
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;; inferior python subprocess to inspect its documentation.  As you
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;; might guessed you should run `python-shell-send-buffer' from time
;; to time to get better results too.

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;; Imenu: There are two index building functions to be used as
;; `imenu-create-index-function': `python-imenu-create-index' (the
;; default one, builds the alist in form of a tree) and
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;; `python-imenu-create-flat-index'.  See also
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;; `python-imenu-format-item-label-function',
;; `python-imenu-format-parent-item-label-function',
;; `python-imenu-format-parent-item-jump-label-function' variables for
;; changing the way labels are formatted in the tree version.
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;; If you used python-mode.el you may miss auto-indentation when
;; inserting newlines.  To achieve the same behavior you have two
;; options:
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;; 1) Enable the minor-mode `electric-indent-mode' (enabled by
;;    default) and use RET.  If this mode is disabled use
;;    `newline-and-indent', bound to C-j.
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;; 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.

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;;; Installation:

;; Add this to your .emacs:

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

;;; TODO:

;;; Code:

(require 'ansi-color)
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(require 'cl-lib)
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(require 'comint)
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(require 'json)
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;; Avoid compiler warnings
(defvar view-return-to-alist)
(defvar compilation-error-regexp-alist)
(defvar outline-heading-end-regexp)
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(autoload 'comint-mode "comint")
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(autoload 'help-function-arglist "help-fns")
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;;;###autoload
(add-to-list 'auto-mode-alist (cons (purecopy "\\.py\\'")  'python-mode))
;;;###autoload
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(add-to-list 'interpreter-mode-alist (cons (purecopy "python[0-9.]*") 'python-mode))
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(defgroup python nil
  "Python Language's flying circus support for Emacs."
  :group 'languages
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  :version "24.3"
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  :link '(emacs-commentary-link "python"))


;;; Bindings

(defvar python-mode-map
  (let ((map (make-sparse-keymap)))
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    ;; Movement
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    (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)
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    (define-key map [remap mark-defun] 'python-mark-defun)
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    (define-key map "\C-c\C-j" 'imenu)
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    ;; 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)
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    ;; 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)
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    (define-key map "\C-c\C-tm" 'python-skeleton-import)
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    (define-key map "\C-c\C-tt" 'python-skeleton-try)
    (define-key map "\C-c\C-tw" 'python-skeleton-while)
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    ;; Shell interaction
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    (define-key map "\C-c\C-p" 'run-python)
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    (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)
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    ;; Some util commands
    (define-key map "\C-c\C-v" 'python-check)
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    (define-key map "\C-c\C-f" 'python-eldoc-at-point)
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    ;; Utilities
    (substitute-key-definition 'complete-symbol 'completion-at-point
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                               map global-map)
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    (easy-menu-define python-menu map "Python Mode menu"
      `("Python"
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        :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"]
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        ["Jump to def/class" imenu
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         :help "Jump to a class or function definition"]
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        "--"
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        ("Skeletons")
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        "---"
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        ["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"]
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        "----"
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        ["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"]))
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    map)
  "Keymap for `python-mode'.")


;;; Python specialized rx

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(eval-when-compile
  (defconst python-rx-constituents
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    `((block-start          . ,(rx symbol-start
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                                   (or "def" "class" "if" "elif" "else" "try"
                                       "except" "finally" "for" "while" "with")
                                   symbol-end))
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      (dedenter            . ,(rx symbol-start
                                   (or "elif" "else" "except" "finally")
                                   symbol-end))
      (block-ender         . ,(rx symbol-start
                                  (or
                                   "break" "continue" "pass" "raise" "return")
                                  symbol-end))
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      (decorator            . ,(rx line-start (* space) ?@ (any letter ?_)
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                                   (* (any word ?_))))
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      (defun                . ,(rx symbol-start (or "def" "class") symbol-end))
      (if-name-main         . ,(rx line-start "if" (+ space) "__name__"
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                                   (+ space) "==" (+ space)
                                   (any ?' ?\") "__main__" (any ?' ?\")
                                   (* space) ?:))
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      (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
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                                (not
                                 (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%))))
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      ;; FIXME: Use regexp-opt.
      (operator             . ,(rx (or "+" "-" "/" "&" "^" "~" "|" "*" "<" ">"
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                                       "=" "%" "**" "//" "<<" ">>" "<=" "!="
                                       "==" ">=" "is" "not")))
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      ;; FIXME: Use regexp-opt.
      (assignment-operator  . ,(rx (or "=" "+=" "-=" "*=" "/=" "//=" "%=" "**="
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                                       ">>=" "<<=" "&=" "^=" "|=")))
      (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.
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                                (group (or  "\"" "\"\"\"" "'" "'''")))))
      (coding-cookie . ,(rx line-start ?# (* space)
                            (or
                             ;; # coding=<encoding name>
                             (: "coding" (or ?: ?=) (* space) (group-n 1 (+ (or word ?-))))
                             ;; # -*- coding: <encoding name> -*-
                             (: "-*-" (* space) "coding:" (* space)
                                (group-n 1 (+ (or word ?-))) (* space) "-*-")
                             ;; # vim: set fileencoding=<encoding name> :
                             (: "vim:" (* space) "set" (+ space)
                                "fileencoding" (* space) ?= (* space)
                                (group-n 1 (+ (or word ?-))) (* space) ":")))))
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    "Additional Python specific sexps for `python-rx'")

  (defmacro python-rx (&rest regexps)
    "Python mode specialized rx macro.
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This variant of `rx' supports common Python named REGEXPS."
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    (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))))))
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;;; Font-lock and syntax
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(eval-when-compile
  (defun python-syntax--context-compiler-macro (form type &optional syntax-ppss)
    (pcase type
      (`'comment
       `(let ((ppss (or ,syntax-ppss (syntax-ppss))))
          (and (nth 4 ppss) (nth 8 ppss))))
      (`'string
       `(let ((ppss (or ,syntax-ppss (syntax-ppss))))
          (and (nth 3 ppss) (nth 8 ppss))))
      (`'paren
       `(nth 1 (or ,syntax-ppss (syntax-ppss))))
      (_ form))))

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(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."
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  (declare (compiler-macro python-syntax--context-compiler-macro))
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  (let ((ppss (or syntax-ppss (syntax-ppss))))
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    (pcase type
      (`comment (and (nth 4 ppss) (nth 8 ppss)))
      (`string (and (nth 3 ppss) (nth 8 ppss)))
      (`paren (nth 1 ppss))
      (_ nil))))
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(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))))

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

(defsubst python-syntax-closing-paren-p ()
  "Return non-nil if char after point is a closing paren."
  (= (syntax-class (syntax-after (point)))
     (syntax-class (string-to-syntax ")"))))
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(define-obsolete-function-alias
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  'python-info-ppss-context #'python-syntax-context "24.3")
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(define-obsolete-function-alias
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  'python-info-ppss-context-type #'python-syntax-context-type "24.3")
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(define-obsolete-function-alias
  'python-info-ppss-comment-or-string-p
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  #'python-syntax-comment-or-string-p "24.3")
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(defun python-font-lock-syntactic-face-function (state)
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  "Return syntactic face given STATE."
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  (if (nth 3 state)
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      (if (python-info-docstring-p state)
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          font-lock-doc-face
        font-lock-string-face)
    font-lock-comment-face))

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(defvar python-font-lock-keywords
  ;; Keywords
  `(,(rx symbol-start
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         (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.
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          "nonlocal"
          ;; Extra:
          "self")
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         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
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    (,(rx symbol-start
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          (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")
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          symbol-end) . font-lock-constant-face)
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    ;; Decorators.
    (,(rx line-start (* (any " \t")) (group "@" (1+ (or word ?_))
                                            (0+ "." (1+ (or word ?_)))))
     (1 font-lock-type-face))
    ;; Builtin Exceptions
    (,(rx symbol-start
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          (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")
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          symbol-end) . font-lock-type-face)
    ;; Builtins
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    (,(rx symbol-start
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          (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__")
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          symbol-end) . font-lock-builtin-face)
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    ;; assignments
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    ;; support for a = b = c = 5
    (,(lambda (limit)
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        (let ((re (python-rx (group (+ (any word ?. ?_)))
                             (? ?\[ (+ (not (any  ?\]))) ?\]) (* space)
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                             assignment-operator))
              (res nil))
          (while (and (setq res (re-search-forward re limit t))
                      (or (python-syntax-context 'paren)
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                          (equal (char-after (point)) ?=))))
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          res))
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     (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)
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                             assignment-operator))
              (res nil))
          (while (and (setq res (re-search-forward re limit t))
                      (goto-char (match-end 1))
                      (python-syntax-context 'paren)))
          res))
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     (1 font-lock-variable-name-face nil nil))))

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(defconst python-syntax-propertize-function
  (syntax-propertize-rules
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   ((python-rx string-delimiter)
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    (0 (ignore (python-syntax-stringify))))))
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(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
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the point where scan starts (defaults to current point), and LIMIT
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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))
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      (setq i (1+ i)))
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    i))

(defun python-syntax-stringify ()
  "Put `syntax-table' property correctly on single/triple quotes."
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  (let* ((num-quotes (length (match-string-no-properties 1)))
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         (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 "|"))))))
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(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 "_"))
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          (sst (standard-syntax-table)))
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      (dotimes (i 128)
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        (unless (= i ?_)
          (if (equal symbol (aref sst i))
              (modify-syntax-entry i "." table)))))
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    (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
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  :group 'python
  :safe 'booleanp)
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(defcustom python-indent-guess-indent-offset-verbose t
  "Non-nil means to emit a warning when indentation guessing fails."
  :type 'boolean
  :group 'python
  :safe' booleanp)

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(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)

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(define-obsolete-variable-alias
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  'python-indent 'python-indent-offset "24.3")
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(define-obsolete-variable-alias
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  'python-guess-indent 'python-indent-guess-indent-offset "24.3")
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(defvar python-indent-current-level 0
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  "Deprecated var available for compatibility.")
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(defvar python-indent-levels '(0)
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  "Deprecated var available for compatibility.")

(make-obsolete-variable
 'python-indent-current-level
 "The indentation API changed to avoid global state.
The function `python-indent-calculate-levels' does not use it
anymore.  If you were defadvising it and or depended on this
variable for indentation customizations, refactor your code to
work on `python-indent-calculate-indentation' instead."
 "24.5")

(make-obsolete-variable
 'python-indent-levels
 "The indentation API changed to avoid global state.
The function `python-indent-calculate-levels' does not use it
anymore.  If you were defadvising it and or depended on this
variable for indentation customizations, refactor your code to
work on `python-indent-calculate-indentation' instead."
 "24.5")
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(defun python-indent-guess-indent-offset ()
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  "Guess and set `python-indent-offset' for the current buffer."
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  (interactive)
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  (save-excursion
    (save-restriction
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      (prog-widen)
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      (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
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                 (not (python-syntax-context-type))
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                 (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))))
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          (if (and indentation (not (zerop indentation)))
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              (set (make-local-variable 'python-indent-offset) indentation)
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            (when python-indent-guess-indent-offset-verbose
              (message "Can't guess python-indent-offset, using defaults: %s"
                       python-indent-offset))))))))
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(defun python-indent-context ()
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  "Get information about the current indentation context.
Context is returned in a cons with the form (STATUS . START).

STATUS can be one of the following:

keyword
-------

:after-comment
 - Point is after a comment line.
 - START is the position of the \"#\" character.
:inside-string
 - Point is inside string.
 - START is the position of the first quote that starts it.
:no-indent
 - No possible indentation case matches.
 - START is always zero.

:inside-paren
 - Fallback case when point is inside paren.
 - START is the first non space char position *after* the open paren.
:inside-paren-at-closing-nested-paren
 - Point is on a line that contains a nested paren closer.
 - START is the position of the open paren it closes.
:inside-paren-at-closing-paren
 - Point is on a line that contains a paren closer.
 - START is the position of the open paren.
:inside-paren-newline-start
 - Point is inside a paren with items starting in their own line.
 - START is the position of the open paren.
:inside-paren-newline-start-from-block
 - Point is inside a paren with items starting in their own line
   from a block start.
 - START is the position of the open paren.

:after-backslash
 - Fallback case when point is after backslash.
 - START is the char after the position of the backslash.
:after-backslash-assignment-continuation
 - Point is after a backslashed assignment.
 - START is the char after the position of the backslash.
:after-backslash-block-continuation
 - Point is after a backslashed block continuation.
 - START is the char after the position of the backslash.
:after-backslash-dotted-continuation
 - Point is after a backslashed dotted continuation.  Previous
   line must contain a dot to align with.
 - START is the char after the position of the backslash.
:after-backslash-first-line
 - First line following a backslashed continuation.
 - START is the char after the position of the backslash.

:after-block-end
 - Point is after a line containing a block ender.
 - START is the position where the ender starts.
:after-block-start
 - Point is after a line starting a block.
 - START is the position where the block starts.
:after-line
 - Point is after a simple line.
 - START is the position where the previous line starts.
:at-dedenter-block-start
 - Point is on a line starting a dedenter block.
 - START is the position where the dedenter block starts."
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  (save-restriction
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    (prog-widen)
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    (let ((ppss (save-excursion
                  (beginning-of-line)
                  (syntax-ppss))))
      (cond
       ;; Beginning of buffer.
       ((= (line-number-at-pos) 1)
        (cons :no-indent 0))
       ;; Inside a string.
       ((let ((start (python-syntax-context 'string ppss)))
          (when start
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            (cons (if (python-info-docstring-p)
                      :inside-docstring
                    :inside-string) start))))
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       ;; Inside a paren.
       ((let* ((start (python-syntax-context 'paren ppss))
               (starts-in-newline
                (when start
                  (save-excursion
                    (goto-char start)
                    (forward-char)
                    (not
                     (= (line-number-at-pos)
                        (progn
                          (python-util-forward-comment)
                          (line-number-at-pos))))))))
          (when start
            (cond
             ;; Current line only holds the closing paren.
             ((save-excursion
                (skip-syntax-forward " ")
                (when (and (python-syntax-closing-paren-p)
                           (progn
                             (forward-char 1)
                             (not (python-syntax-context 'paren))))
                  (cons :inside-paren-at-closing-paren start))))
             ;; Current line only holds a closing paren for nested.
             ((save-excursion
                (back-to-indentation)
                (python-syntax-closing-paren-p))
              (cons :inside-paren-at-closing-nested-paren start))
             ;; This line starts from a opening block in its own line.
             ((save-excursion
                (goto-char start)
                (when (and
                       starts-in-newline
                       (save-excursion
                         (back-to-indentation)
                         (looking-at (python-rx block-start))))
                  (cons
                   :inside-paren-newline-start-from-block start))))
             (starts-in-newline
              (cons :inside-paren-newline-start start))
             ;; General case.
             (t (cons :inside-paren
                      (save-excursion
                        (goto-char (1+ start))
                        (skip-syntax-forward "(" 1)
                        (skip-syntax-forward " ")
                        (point))))))))
       ;; After backslash.
       ((let ((start (when (not (python-syntax-comment-or-string-p ppss))
                       (python-info-line-ends-backslash-p
                        (1- (line-number-at-pos))))))
          (when start
            (cond
             ;; Continuation of dotted expression.
             ((save-excursion
                (back-to-indentation)
                (when (eq (char-after) ?\.)
                  ;; Move point back until it's not inside a paren.
                  (while (prog2
                             (forward-line -1)
                             (and (not (bobp))
                                  (python-syntax-context 'paren))))
                  (goto-char (line-end-position))
                  (while (and (search-backward
                               "." (line-beginning-position) t)
                              (python-syntax-context-type)))
                  ;; Ensure previous statement has dot to align with.
                  (when (and (eq (char-after) ?\.)
                             (not (python-syntax-context-type)))
                    (cons :after-backslash-dotted-continuation (point))))))
             ;; Continuation of block definition.
             ((let ((block-continuation-start
                     (python-info-block-continuation-line-p)))
                (when block-continuation-start
                  (save-excursion
                    (goto-char block-continuation-start)
                    (re-search-forward
                     (python-rx block-start (* space))
                     (line-end-position) t)
                    (cons :after-backslash-block-continuation (point))))))
             ;; Continuation of assignment.
             ((let ((assignment-continuation-start
                     (python-info-assignment-continuation-line-p)))
                (when assignment-continuation-start
                  (save-excursion
                    (goto-char assignment-continuation-start)
                    (cons :after-backslash-assignment-continuation (point))))))
             ;; First line after backslash continuation start.
             ((save-excursion
                (goto-char start)
                (when (or (= (line-number-at-pos) 1)
                          (not (python-info-beginning-of-backslash
                                (1- (line-number-at-pos)))))
                  (cons :after-backslash-first-line start))))
             ;; General case.
             (t (cons :after-backslash start))))))
       ;; After beginning of block.
       ((let ((start (save-excursion
                       (back-to-indentation)
                       (python-util-forward-comment -1)
                       (when (equal (char-before) ?:)
                         (python-nav-beginning-of-block)))))
          (when start
            (cons :after-block-start start))))
       ;; At dedenter statement.
       ((let ((start (python-info-dedenter-statement-p)))
          (when start
            (cons :at-dedenter-block-start start))))
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       ;; After normal line, comment or ender (default case).
       ((save-excursion
          (back-to-indentation)
          (skip-chars-backward " \t\n")
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          (if (bobp)
              (cons :no-indent 0)
            (python-nav-beginning-of-statement)
            (cons
             (cond ((python-info-current-line-comment-p)
                    :after-comment)
                   ((save-excursion
                      (goto-char (line-end-position))
                      (python-util-forward-comment -1)
                      (python-nav-beginning-of-statement)
                      (looking-at (python-rx block-ender)))
                    :after-block-end)
                   (t :after-line))
             (point)))))))))
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(defun python-indent--calculate-indentation ()
  "Internal implementation of `python-indent-calculate-indentation'.
May return an integer for the maximum possible indentation at
current context or a list of integers.  The latter case is only
happening for :at-dedenter-block-start context since the
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possibilities can be narrowed to specific indentation points."
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  (save-restriction
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    (prog-widen)
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    (save-excursion
      (pcase (python-indent-context)
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        (`(:no-indent . ,_) (prog-first-column)) ; usually 0
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        (`(,(or :after-line
                :after-comment
                :inside-string
                :after-backslash
                :inside-paren-at-closing-paren
                :inside-paren-at-closing-nested-paren) . ,start)
         ;; Copy previous indentation.
         (goto-char start)
         (current-indentation))
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        (`(:inside-docstring . ,start)
         (let* ((line-indentation (current-indentation))
                (base-indent (progn
                               (goto-char start)
                               (current-indentation))))
           (max line-indentation base-indent)))
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        (`(,(or :after-block-start
                :after-backslash-first-line
                :inside-paren-newline-start) . ,start)
         ;; Add one indentation level.
         (goto-char start)
         (+ (current-indentation) python-indent-offset))
        (`(,(or :inside-paren
                :after-backslash-block-continuation
                :after-backslash-assignment-continuation
                :after-backslash-dotted-continuation) . ,start)
         ;; Use the column given by the context.
         (goto-char start)
         (current-column))
        (`(:after-block-end . ,start)
         ;; Subtract one indentation level.
         (goto-char start)
         (- (current-indentation) python-indent-offset))
        (`(:at-dedenter-block-start . ,_)
         ;; List all possible indentation levels from opening blocks.
         (let ((opening-block-start-points
                (python-info-dedenter-opening-block-positions)))
           (if (not opening-block-start-points)
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               (prog-first-column) ; if not found default to first column
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             (mapcar (lambda (pos)
                       (save-excursion
                         (goto-char pos)
                         (current-indentation)))
                     opening-block-start-points))))
        (`(,(or :inside-paren-newline-start-from-block) . ,start)
         ;; Add two indentation levels to make the suite stand out.
         (goto-char start)
         (+ (current-indentation) (* python-indent-offset 2)))))))

(defun python-indent--calculate-levels (indentation)
  "Calculate levels list given INDENTATION.
Argument INDENTATION can either be an integer or a list of
integers.  Levels are returned in ascending order, and in the
case INDENTATION is a list, this order is enforced."
  (if (listp indentation)
      (sort (copy-sequence indentation) #'<)
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    (nconc (number-sequence (prog-first-column) (1- indentation)
                            python-indent-offset)
           (list indentation))))
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(defun python-indent--previous-level (levels indentation)
  "Return previous level from LEVELS relative to INDENTATION."
  (let* ((levels (sort (copy-sequence levels) #'>))
         (default (car levels)))
    (catch 'return
      (dolist (level levels)
        (when (funcall #'< level indentation)
          (throw 'return level)))
      default)))

(defun python-indent-calculate-indentation (&optional previous)
  "Calculate indentation.
Get indentation of PREVIOUS level when argument is non-nil.
Return the max level of the cycle when indentation reaches the
minimum."
  (let* ((indentation (python-indent--calculate-indentation))
         (levels (python-indent--calculate-levels indentation)))
    (if previous
        (python-indent--previous-level levels (current-indentation))
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      (if levels
          (apply #'max levels)
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        (prog-first-column)))))
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(defun python-indent-line (&optional previous)
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  "Internal implementation of `python-indent-line-function'.
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Use the PREVIOUS level when argument is non-nil, otherwise indent
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to the maximum available level.  When indentation is the minimum
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possible and PREVIOUS is non-nil, cycle back to the maximum
level."
  (let ((follow-indentation-p
         ;; Check if point is within indentation.
         (and (<= (line-beginning-position) (point))
              (>= (+ (line-beginning-position)
                     (current-indentation))
                  (point)))))
    (save-excursion
      (indent-line-to
       (python-indent-calculate-indentation previous))
      (python-info-dedenter-opening-block-message))
    (when follow-indentation-p
      (back-to-indentation))))
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(defun python-indent-calculate-levels ()
  "Return possible indentation levels."
  (python-indent--calculate-levels
   (python-indent--calculate-indentation)))
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(defun python-indent-line-function ()
  "`indent-line-function' for Python mode.
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When the variable `last-command' is equal to one of the symbols
inside `python-indent-trigger-commands' it cycles possible
indentation levels from right to left."
  (python-indent-line
   (and (memq this-command python-indent-trigger-commands)
        (eq last-command this-command))))
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(defun python-indent-dedent-line ()
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  "De-indent current line."
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  (interactive "*")
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  (when (and (not (bolp))
           (not (python-syntax-comment-or-string-p))
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           (= (current-indentation) (current-column)))
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      (python-indent-line t)
      t))
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(defun python-indent-dedent-line-backspace (arg)
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  "De-indent current line.
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Argument ARG is passed to `backward-delete-char-untabify' when
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point is not in between the indentation."
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  (interactive "*p")
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  (unless (python-indent-dedent-line)
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    (backward-delete-char-untabify arg)))
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(put 'python-indent-dedent-line-backspace 'delete-selection 'supersede)
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(defun python-indent-region (start end)
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  "Indent a Python region automagically.
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Called from a program, START and END specify the region to indent."
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  (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))
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            (when (and
                   ;; Skip if previous line is empty or a comment.
                   (save-excursion
                     (let ((line-is-comment-p
                            (python-info-current-line-comment-p)))
                       (forward-line -1)
                       (not
                        (or (and (python-info-current-line-comment-p)
                                 ;; Unless this line is a comment too.
                                 (not line-is-comment-p))
                            (python-info-current-line-empty-p)))))
                   ;; Don't mess with strings, unless it's the
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                   ;; enclosing set of quotes or a docstring.
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                   (or (not (python-syntax-context 'string))
                       (eq
                        (syntax-after
                         (+ (1- (point))
                            (current-indentation)
                            (python-syntax-count-quotes (char-after) (point))))
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                        (string-to-syntax "|"))
                       (python-info-docstring-p))
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                   ;; Skip if current line is a block start, a
                   ;; dedenter or block ender.
                   (save-excursion
                     (back-to-indentation)
                     (not (looking-at
                           (python-rx
                            (or block-start dedenter block-ender))))))
              (python-indent-line)))
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        (forward-line 1))
      (move-marker end nil))))
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(defun python-indent-shift-left (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
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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."
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  (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)
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    (let ((deactivate-mark nil))
      (save-excursion
        (goto-char start)
        (while (< (point) end)
          (if (and (< (current-indentation) count)
                   (not (looking-at "[ \t]*$")))
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              (user-error "Can't shift all lines enough"))
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          (forward-line))
        (indent-rigidly start end (- count))))))
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(defun python-indent-shift-right (start end &optional count)
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  "Shift lines contained in region START END by COUNT columns to the right.
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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."
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  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
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  (let ((deactivate-mark nil))
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    (setq count (if count (prefix-numeric-value count)
                  python-indent-offset))
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    (indent-rigidly start end count)))
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(defun python-indent-post-self-insert-function ()
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  "Adjust indentation after insertion of some characters.
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This function is intended to be added to `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."
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  (when (and electric-indent-mode
             (eq (char-before) last-command-event))
    (cond
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     ;; Electric indent inside parens
     ((and
       (not (bolp))
       (let ((paren-start (python-syntax-context 'paren)))
         ;; Check that point is inside parens.
         (when paren-start
           (not
            ;; Filter the case where input is happening in the same
            ;; line where the open paren is.
            (= (line-number-at-pos)
               (line-number-at-pos paren-start)))))
       ;; When content has been added before the closing paren or a
       ;; comma has been inserted, it's ok to do the trick.
       (or
        (memq (char-after) '(?\) ?\] ?\}))
        (eq (char-before) ?,)))
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      (save-excursion
        (goto-char (line-beginning-position))
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        (let ((indentation (python-indent-calculate-indentation)))
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          (when (and (numberp indentation) (< (current-indentation) indentation))
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            (indent-line-to indentation)))))
     ;; Electric colon
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     ((and (eq ?: last-command-event)
           (memq ?: electric-indent-chars)
           (not current-prefix-arg)
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           ;; Trigger electric colon only at end of line
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           (eolp)
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           ;; Avoid re-indenting on extra colon
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           (not (equal ?: (char-before (1- (point)))))
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           (not (python-syntax-comment-or-string-p)))
      ;; Just re-indent dedenters
      (let ((dedenter-pos (python-info-dedenter-statement-p))
            (current-pos (point)))
        (when dedenter-pos
          (save-excursion
            (goto-char dedenter-pos)
            (python-indent-line)
            (<