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annotate lisp/syntax-ppss.el @ 5577:0b6e7ae1e78f

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Update a comment with a better understanding of the optimizer, bytecomp.el lisp/ChangeLog addition: 2011-10-04 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el (byte-compile-funcall): Correct a comment here, explaining why the optimizer doesn't expand (funcall #'(lambda ...)) in some contexts with inline labels, and why it's reasonable to do it here.
author Aidan Kehoe <kehoea@parhasard.net>
date Tue, 04 Oct 2011 09:02:14 +0100
parents 69a08906ad27
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ;;; syntax-ppss.el --- helper functions to find syntactic context
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2
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3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
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4 ;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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5
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6 ;; Maintainer: XEmacs Development Team
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7 ;; Keywords: internal
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software: you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by the
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13 ;; Free Software Foundation, either version 3 of the License, or (at your
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14 ;; option) any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT
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17 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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19 ;; for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>.
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23
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24 ;;; Synched up with: FSF 23,3, syntax.el.
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25
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26 ;;; Commentary:
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27
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28 ;; The main exported function is `syntax-ppss'. You might also need
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29 ;; to call `syntax-ppss-flush-cache' or to add it to
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30 ;; before-change-functions'(although this is automatically done by
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31 ;; syntax-ppss when needed, but that might fail if syntax-ppss is
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32 ;; called in a context where before-change-functions is temporarily
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33 ;; let-bound to nil).
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34
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35 ;;; Todo:
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36
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37 ;; - do something about the case where the syntax-table is changed.
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38 ;; This typically happens with tex-mode and its `$' operator.
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39 ;; - move font-lock-syntactic-keywords in here. Then again, maybe not.
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40 ;; - new functions `syntax-state', ... to replace uses of parse-partial-state
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41 ;; with something higher-level (similar to syntax-ppss-context).
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42 ;; - interaction with mmm-mode.
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43
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44 ;;; Code:
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45
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46 ;; Note: PPSS stands for `parse-partial-sexp state'
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47
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48 (eval-when-compile (require 'cl))
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49
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50 (defvar font-lock-beginning-of-syntax-function)
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51
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52 (defsubst syntax-ppss-depth (ppss)
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53 (nth 0 ppss))
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54
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55 (defun syntax-ppss-toplevel-pos (ppss)
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56 "Get the latest syntactically outermost position found in a syntactic scan.
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57 PPSS is a scan state, as returned by `parse-partial-sexp' or `syntax-ppss'.
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58 An \"outermost position\" means one that it is outside of any syntactic entity:
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59 outside of any parentheses, comments, or strings encountered in the scan.
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60 If no such position is recorded in PPSS (because the end of the scan was
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61 itself at the outermost level), return nil."
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62 ;; BEWARE! We rely on the undocumented 9th field. The 9th field currently
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63 ;; contains the list of positions of the enclosing open-parens.
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64 ;; I.e. those positions are outside of any string/comment and the first of
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65 ;; those is outside of any paren (i.e. corresponds to a nil ppss).
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66 ;; If this list is empty but we are in a string or comment, then the 8th
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67 ;; field contains a similar "toplevel" position.
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68 (or (car (nth 9 ppss))
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69 (nth 8 ppss)))
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70
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71 (defsubst syntax-ppss-context (ppss)
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72 (cond
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73 ((nth 3 ppss) 'string)
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74 ((nth 4 ppss) 'comment)
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75 (t nil)))
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76
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77 (defvar syntax-ppss-max-span 20000
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78 "Threshold below which cache info is deemed unnecessary.
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79 We try to make sure that cache entries are at least this far apart
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80 from each other, to avoid keeping too much useless info.")
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81
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82 (defvar syntax-begin-function nil
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83 "Function to move back outside of any comment/string/paren.
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84 This function should move the cursor back to some syntactically safe
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85 point (where the PPSS is equivalent to nil).")
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86
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87 (defvar syntax-ppss-cache nil
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88 "List of (POS . PPSS) pairs, in decreasing POS order.")
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89 (make-variable-buffer-local 'syntax-ppss-cache)
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90 (defvar syntax-ppss-last nil
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91 "Cache of (LAST-POS . LAST-PPSS).")
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92 (make-variable-buffer-local 'syntax-ppss-last)
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93
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94 (defalias 'syntax-ppss-after-change-function 'syntax-ppss-flush-cache)
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95 (defun syntax-ppss-flush-cache (beg &rest ignored)
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96 "Flush the cache of `syntax-ppss' starting at position BEG."
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97 ;; Flush invalid cache entries.
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98 (while (and syntax-ppss-cache (> (caar syntax-ppss-cache) beg))
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99 (setq syntax-ppss-cache (cdr syntax-ppss-cache)))
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100 ;; Throw away `last' value if made invalid.
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101 (when (< beg (or (car syntax-ppss-last) 0))
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102 ;; If syntax-begin-function jumped to BEG, then the old state at BEG can
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103 ;; depend on the text after BEG (which is presumably changed). So if
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104 ;; BEG=(car (nth 10 syntax-ppss-last)) don't reuse that data because the
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105 ;; assumed nil state at BEG may not be valid any more.
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106 (if (<= beg (or (syntax-ppss-toplevel-pos (cdr syntax-ppss-last))
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107 (nth 3 syntax-ppss-last)
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108 0))
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109 (setq syntax-ppss-last nil)
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110 (setcar syntax-ppss-last nil)))
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111 ;; Unregister if there's no cache left. Sadly this doesn't work
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112 ;; because `before-change-functions' is temporarily bound to nil here.
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113 ;; (unless syntax-ppss-cache
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114 ;; (remove-hook 'before-change-functions 'syntax-ppss-flush-cache t))
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115 )
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116
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117 (defvar syntax-ppss-stats
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118 [(0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (1 . 2500.0)])
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119 (defun syntax-ppss-stats ()
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120 (mapcar (lambda (x)
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121 (condition-case nil
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122 (cons (car x) (truncate (/ (cdr x) (car x))))
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123 (error nil)))
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124 syntax-ppss-stats))
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125
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126 (defun syntax-ppss (&optional pos)
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127 "Parse-Partial-Sexp State at POS, defaulting to point.
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128 The returned value is the same as `parse-partial-sexp' except that
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
129 the 2nd and 6th values of the returned state cannot be relied upon.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
130 Point is at POS when this function returns."
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
131 ;; Default values.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
132 (unless pos (setq pos (point)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
133 ;;
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
134 (let ((old-ppss (cdr syntax-ppss-last))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
135 (old-pos (car syntax-ppss-last))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
136 (ppss nil)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
137 (pt-min (point-min)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
138 (if (and old-pos (> old-pos pos)) (setq old-pos nil))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
139 ;; Use the OLD-POS if usable and close. Don't update the `last' cache.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
140 (condition-case nil
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
141 (if (and old-pos (< (- pos old-pos)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
142 ;; The time to use syntax-begin-function and
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
143 ;; find PPSS is assumed to be about 2 * distance.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
144 (* 2 (/ (cdr (aref syntax-ppss-stats 5))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
145 (1+ (car (aref syntax-ppss-stats 5)))))))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
146 (progn
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
147 (incf (car (aref syntax-ppss-stats 0)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
148 (incf (cdr (aref syntax-ppss-stats 0)) (- pos old-pos))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
149 (parse-partial-sexp old-pos pos nil nil old-ppss))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
150
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
151 (cond
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
152 ;; Use OLD-PPSS if possible and close enough.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
153 ((and (not old-pos) old-ppss
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
154 ;; If `pt-min' is too far from `pos', we could try to use
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
155 ;; other positions in (nth 9 old-ppss), but that doesn't
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
156 ;; seem to happen in practice and it would complicate this
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
157 ;; code (and the before-change-function code even more).
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
158 ;; But maybe it would be useful in "degenerate" cases such
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
159 ;; as when the whole file is wrapped in a set
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
160 ;; of parentheses.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
161 (setq pt-min (or (syntax-ppss-toplevel-pos old-ppss)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
162 (nth 2 old-ppss)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
163 (<= pt-min pos) (< (- pos pt-min) syntax-ppss-max-span))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
164 (incf (car (aref syntax-ppss-stats 1)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
165 (incf (cdr (aref syntax-ppss-stats 1)) (- pos pt-min))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
166 (setq ppss (parse-partial-sexp pt-min pos)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
167 ;; The OLD-* data can't be used. Consult the cache.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
168 (t
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
169 (let ((cache-pred nil)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
170 (cache syntax-ppss-cache)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
171 (pt-min (point-min))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
172 ;; I differentiate between PT-MIN and PT-BEST because
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
173 ;; I feel like it might be important to ensure that the
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
174 ;; cache is only filled with 100% sure data (whereas
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
175 ;; syntax-begin-function might return incorrect data).
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
176 ;; Maybe that's just stupid.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
177 (pt-best (point-min))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
178 (ppss-best nil))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
179 ;; look for a usable cache entry.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
180 (while (and cache (< pos (caar cache)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
181 (setq cache-pred cache)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
182 (setq cache (cdr cache)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
183 (if cache (setq pt-min (caar cache) ppss (cdar cache)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
184
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
185 ;; Setup the before-change function if necessary.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
186 (unless (or syntax-ppss-cache syntax-ppss-last)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
187 (add-hook 'before-change-functions
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
188 'syntax-ppss-flush-cache t t))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
189
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
190 ;; Use the best of OLD-POS and CACHE.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
191 (if (or (not old-pos) (< old-pos pt-min))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
192 (setq pt-best pt-min ppss-best ppss)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
193 (incf (car (aref syntax-ppss-stats 4)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
194 (incf (cdr (aref syntax-ppss-stats 4)) (- pos old-pos))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
195 (setq pt-best old-pos ppss-best old-ppss))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
196
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
197 ;; Use the `syntax-begin-function' if available.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
198 ;; We could try using that function earlier, but:
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
199 ;; - The result might not be 100% reliable, so it's better to use
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
200 ;; the cache if available.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
201 ;; - The function might be slow.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
202 ;; - If this function almost always finds a safe nearby spot,
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
203 ;; the cache won't be populated, so consulting it is cheap.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
204 (when (and (not syntax-begin-function)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
205 (boundp 'font-lock-beginning-of-syntax-function)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
206 font-lock-beginning-of-syntax-function)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
207 (set (make-local-variable 'syntax-begin-function)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
208 font-lock-beginning-of-syntax-function))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
209 (when (and syntax-begin-function
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
210 (progn (goto-char pos)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
211 (funcall syntax-begin-function)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
212 ;; Make sure it's better.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
213 (> (point) pt-best))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
214 ;; Simple sanity check.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
215 (not (memq (get-text-property (point) 'face)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
216 '(font-lock-string-face font-lock-doc-face
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
217 font-lock-comment-face))))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
218 (incf (car (aref syntax-ppss-stats 5)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
219 (incf (cdr (aref syntax-ppss-stats 5)) (- pos (point)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
220 (setq pt-best (point) ppss-best nil))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
221
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
222 (cond
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
223 ;; Quick case when we found a nearby pos.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
224 ((< (- pos pt-best) syntax-ppss-max-span)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
225 (incf (car (aref syntax-ppss-stats 2)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
226 (incf (cdr (aref syntax-ppss-stats 2)) (- pos pt-best))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
227 (setq ppss (parse-partial-sexp pt-best pos nil nil ppss-best)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
228 ;; Slow case: compute the state from some known position and
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
229 ;; populate the cache so we won't need to do it again soon.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
230 (t
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
231 (incf (car (aref syntax-ppss-stats 3)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
232 (incf (cdr (aref syntax-ppss-stats 3)) (- pos pt-min))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
233
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
234 ;; If `pt-min' is too far, add a few intermediate entries.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
235 (while (> (- pos pt-min) (* 2 syntax-ppss-max-span))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
236 (setq ppss (parse-partial-sexp
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
237 pt-min (setq pt-min (/ (+ pt-min pos) 2))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
238 nil nil ppss))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
239 (let ((pair (cons pt-min ppss)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
240 (if cache-pred
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
241 (push pair (cdr cache-pred))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
242 (push pair syntax-ppss-cache))))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
243
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
244 ;; Compute the actual return value.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
245 (setq ppss (parse-partial-sexp pt-min pos nil nil ppss))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
246
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
247 ;; Debugging check.
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
248 ;; (let ((real-ppss (parse-partial-sexp (point-min) pos)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
249 ;; (setcar (last ppss 4) 0)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
250 ;; (setcar (last real-ppss 4) 0)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
251 ;; (setcar (last ppss 8) nil)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
252 ;; (setcar (last real-ppss 8) nil)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
253 ;; (unless (equal ppss real-ppss)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
254 ;; (message "!!Syntax: %s != %s" ppss real-ppss)
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
255 ;; (setq ppss real-ppss)))
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
256
69a08906ad27 Introducing syntax-ppss.el from GNU.
Mats Lidell <mats.lidell@cag.se>
parents:
diff changeset
257 ;; Store it in the cache.
69a08906ad27 Introducing syntax-ppss.el from GNU.
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258 (let ((pair (cons pos ppss)))
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259 (if cache-pred
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260 (if (> (- (caar cache-pred) pos) syntax-ppss-max-span)
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261 (push pair (cdr cache-pred))
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262 (setcar cache-pred pair))
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263 (if (or (null syntax-ppss-cache)
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264 (> (- (caar syntax-ppss-cache) pos)
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265 syntax-ppss-max-span))
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266 (push pair syntax-ppss-cache)
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267 (setcar syntax-ppss-cache pair)))))))))
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268
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269 (setq syntax-ppss-last (cons pos ppss))
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270 ppss)
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271 (args-out-of-range
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272 ;; If the buffer is more narrowed than when we built the cache,
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273 ;; we may end up calling parse-partial-sexp with a position before
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274 ;; point-min. In that case, just parse from point-min assuming
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275 ;; a nil state.
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276 (parse-partial-sexp (point-min) pos)))))
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277
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278 ;; Debugging functions
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279
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280 (defun syntax-ppss-debug ()
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281 (let ((pt nil)
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282 (min-diffs nil))
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283 (dolist (x (append syntax-ppss-cache (list (cons (point-min) nil))))
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284 (when pt (push (- pt (car x)) min-diffs))
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285 (setq pt (car x)))
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286 min-diffs))
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287
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288 ;;; syntax-ppss.el ends here