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+;; Copyright (c) 2008 Paulo Cesar Pereira de Andrade
+;;
+;; Permission is hereby granted, free of charge, to any person obtaining a
+;; copy of this software and associated documentation files (the "Software"),
+;; to deal in the Software without restriction, including without limitation
+;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
+;; and/or sell copies of the Software, and to permit persons to whom the
+;; Software is furnished to do so, subject to the following conditions:
+;;
+;; The above copyright notice and this permission notice (including the next
+;; paragraph) shall be included in all copies or substantial portions of the
+;; Software.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+;; DEALINGS IN THE SOFTWARE.
+;;
+;; Author: Paulo Cesar Pereira de Andrade
+;;
+
+(require "syntax")
+(require "indent")
+(in-package "XEDIT")
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defsynprop *prop-indent*
+ "indent"
+ :font "*courier-medium-r*-12-*"
+ :background "Gray92")
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defsynoptions *python-DEFAULT-options*
+ ;; Positive number. Basic indentation
+ (:indentation . 4)
+
+ ;; Boolean. Move cursor to the indent column after pressing <Enter>?
+ (:newline-indent . t)
+
+ ;; Boolean. Set to T if tabs shouldn't be used to fill indentation.
+ (:emulate-tabs . t)
+
+ ;; Boolean. Only calculate indentation after pressing <Enter>?
+ ;; This may be useful if the parser does not always
+ ;; do what the user expects...
+ (:only-newline-indent . nil)
+
+ ;; Boolean. Remove extra spaces from previous line.
+ ;; This should default to T when newline-indent is not NIL.
+ (:trim-blank-lines . nil)
+
+ ;; Boolean. If this hash-table entry is set, no indentation is done.
+ ;; Useful to temporarily disable indentation.
+ (:disable-indent . nil))
+
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+;; Not doing "special" indentation of multiline ( because it is attempting
+;; to do a "smart" indentation and usually don't read more then one line
+;; back to resolve indentation.
+;; Code for multiline { and [, usually declaring vector/hash like variables
+;; should be working properly.
+;; Note that the indent lisp hook is only run on character additions, so
+;; it doesn't do a "smart" tabbing when pressing backspace, but it will
+;; properly align to the "closest tab stop" when typping a character.
+(defindent *python-mode-indent* :main
+ ;; this must be the first token
+ (indtoken "^\\s*" :indent
+ :code (or *offset* (setq *offset* (+ *ind-offset* *ind-length*))))
+
+ ;; ignore comments
+ (indtoken "#.*$" nil)
+
+ (indtoken ":" :collon :nospec t)
+
+ ;; don't directly match {}, [], () strings, and :
+ (indtoken "[a-zA-Z0-9+*/%^&<>=.,|!~-]+" :expression)
+
+ ;; if in the same line, reduce now, as delimiters are identical
+ (indtoken "'([^\\']|\\\\.)*'" :expression)
+ (indtoken "\"([^\\\"]|\\\\.)*\"" :expression)
+ ;; otherwise, use a table
+ (indtoken "\"" :cstring :nospec t :begin :string)
+ (indtoken "'" :cconstant :nospec t :begin :constant)
+ (indtoken "\"\"\"" :cstring3 :nospec t :begin :string3)
+ (indtoken "'''" :cconstant :nospec t :begin :constant3)
+
+ (indinit (braces 0))
+ (indtoken "}" :cbrace :nospec t :code (incf braces))
+ (indtoken "{" :obrace :nospec t :code (decf braces))
+ (indtoken ")" :cparen :nospec t :code (incf braces))
+ (indtoken "(" :oparen :nospec t :code (decf braces))
+ (indtoken "]" :cbrack :nospec t :code (incf braces))
+ (indtoken "[" :obrack :nospec t :code (decf braces))
+
+ ;; This must be the last token
+ (indtoken "$" :eol)
+
+ (indtable :string
+ ;; Ignore escaped characters
+ (indtoken "\\." nil)
+ ;; Return to the toplevel when the start of the string is found
+ (indtoken "\"" :ostring :nospec t :switch -1))
+ (indtable :constant
+ (indtoken "\\." nil)
+ (indtoken "'" :oconstant :nospec t :switch -1))
+
+ (indtable :string3
+ (indtoken "\"\"\"" :ostring3 :nospec t :switch -1))
+ (indtable :constant3
+ (indtoken "'''" :oconstant3 :nospec t :switch -1))
+
+ ;; Reduce what isn't reduced in regex pattern match
+ (indreduce :expression
+ t
+ ((:expression :expression)
+ ;; multiline strings
+ (:ostring (not :ostring) :cstring)
+ (:oconstant (not :oconstant) :cconstant)
+ (:ostring3 (not :ostring3) :cstring3)
+ (:oconstant3 (not :oconstant3) :cconstant3)
+ ;; braces, parenthesis and brackets
+ (:obrace (not :obrace) :cbrace)
+ (:oparen (not :oparen) :cparen)
+ (:obrack (not :obrack) :cbrack)))
+
+ ;; This should be the most common exit point;
+ ;; just copy previous line indentation.
+ (indreduce :align
+ (< *ind-offset* *ind-start*)
+ ((:indent :eol)
+ (:indent :expression :eol))
+ (setq *indent* (offset-indentation *offset* :resolve t))
+
+ ;; If cursor is not in an indentation tab, assume user is trying to align
+ ;; to another block, and just use the resolve code to round it down
+ (unless (/= (mod *indent* *base-indent*) 0)
+ ;; else use "previous-line" indentation.
+ (setq *indent* (offset-indentation *ind-offset* :resolve t)))
+ (indent-macro-reject-left))
+
+ ;; This should be second most common exit point;
+ ;; add one indentation level.
+ (indreduce :align
+ (< *ind-offset* *ind-start*)
+ ((:indent :expression :collon :eol))
+ (setq *indent* (+ *base-indent* (offset-indentation *ind-offset* :resolve t)))
+ (indent-macro-reject-left))
+
+ (indresolve :align
+ (setq *indent* (- *indent* (mod *indent* *base-indent*))))
+
+ ;; Calculate special indentation for [ and {
+ (indresolve (:obrack :obrace)
+ (and
+ (< *ind-offset* *ind-start*)
+ (setq *indent* (+ *base-indent*
+ (offset-indentation *ind-offset* :resolve t)))))
+ (indresolve (:cbrack :cbrace)
+ (setq *indent* (- (offset-indentation *ind-offset* :resolve t)
+ (if (>= *ind-offset* *ind-start*)
+ *base-indent* 0))))
+)
+
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defun python-offset-indent (&aux char (point (point)))
+ ;; Skip spaces forward
+ (while (member (setq char (char-after point)) indent-spaces)
+ (incf point))
+ point)
+
+(compile 'python-offset-indent)
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defun python-should-indent (options &aux point start end offset)
+ (when (hash-table-p options)
+ ;; check if previous line has extra spaces
+ (and (gethash :trim-blank-lines options)
+ (indent-clear-empty-line))
+
+ ;; indentation disabled?
+ (and (gethash :disable-indent options)
+ (return-from python-should-indent))
+
+ (setq
+ point (point)
+ start (scan point :eol :left)
+ end (scan point :eol :right))
+
+ ;; if at bol and should indent only when starting a line
+ (and (gethash :only-newline-indent options)
+ (return-from python-should-indent (= point start)))
+
+ ;; at the start of a line
+ (and (= point start)
+ (return-from python-should-indent (gethash :newline-indent options)))
+
+ ;; if first character
+ (and (= point (1+ start))
+ (return-from python-should-indent t))
+
+ (setq offset start)
+ (while (and
+ (< offset end)
+ (member (char-after offset) indent-spaces))
+ (incf offset))
+
+ ;; cursor is at first character in line, with possible spaces before it
+ (return-from python-should-indent (or (= offset end) (= offset (1- point))))
+ )
+ ;; Should not indent
+ nil)
+
+(compile 'python-should-indent)
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defun python-indent (syntax syntable)
+ (let*
+ ((options (syntax-options syntax))
+ *base-indent*)
+
+ (or (python-should-indent options) (return-from python-indent))
+ (setq
+ *base-indent* (gethash :indentation options 4))
+
+ (indent-macro
+ *python-mode-indent*
+ (python-offset-indent)
+ (gethash :emulate-tabs options))))
+
+(compile 'python-indent)
+
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defvar *python-mode-options* *python-DEFAULT-options*)
+
+
+;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+(defsyntax *python-mode* :main nil #'python-indent *python-mode-options*
+ ;; keywords
+ (syntoken
+ (string-concat
+ "\\<("
+ "and|break|class|continue|def|del|enumerate|except|False|for|"
+ "elif|else|if|in|is|len|None|not|or|pass|print|raise|range|"
+ "return|self|True|try|type|while|yield"
+ ")\\>")
+ :property *prop-keyword*)
+
+ (syntoken "^\\s+" :property *prop-indent*)
+
+ ;; preprocessor like
+ (syntoken
+ (string-concat
+ "\\<("
+ "from|import"
+ ")\\>")
+ :property *prop-preprocessor*)
+
+ ;; namespaces/accessors
+ (syntoken "(\\w+\\.)+" :property *prop-preprocessor*)
+
+ ;; more preprocessor like
+ (syntoken "\\<__[a-zA-Z0-9]+__\\>" :property *prop-keyword*)
+
+ ;; numbers
+ (syntoken
+ (string-concat
+ "\\<("
+ ;; Integers
+ "(\\d+|0x\\x+)L?|"
+ ;; Floats
+ "\\d+\\.?\\d*(e[+-]?\\d+)?"
+ ")\\>")
+ :icase t
+ :property *prop-number*)
+
+ ;; comments
+ (syntoken "#.*" :property *prop-comment*)
+
+ ;; punctuation
+ (syntoken "[][(){}+*/%^&<>=.,|!~:-]+" :property *prop-punctuation*)
+
+ ;; constant or constant like
+ (syntoken "'" :nospec t :property *prop-constant* :begin :constant)
+ (syntoken "'''" :nospec t :property *prop-constant* :begin :constant3)
+
+ ;; strings
+ (syntoken "\"" :nospec t :property *prop-string* :begin :string)
+ (syntoken "\"\"\"" :nospec t :property *prop-string* :begin :string3)
+
+ (syntable :constant *prop-constant* nil
+ (syntoken "\\\\.")
+ (syntoken "'" :nospec t :switch -1))
+ (syntable :constant3 *prop-constant* nil
+ (syntoken "'''" :nospec t :switch -1))
+ (syntable :string *prop-string* nil
+ (syntoken "\\\\.")
+ (syntoken "\"" :nospec t :switch -1))
+ (syntable :string3 *prop-string* nil
+ (syntoken "\"\"\"" :nospec t :switch -1))
+)