;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CL-PPCRE; Base: 10 -*-
;;; $Header$

;;; globally declared special variables

;;; Copyright (c) 2002-2004, Dr. Edmund Weitz. All rights reserved.

;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:

;;;   * Redistributions of source code must retain the above copyright
;;;     notice, this list of conditions and the following disclaimer.

;;;   * Redistributions in binary form must reproduce the above
;;;     copyright notice, this list of conditions and the following
;;;     disclaimer in the documentation and/or other materials
;;;     provided with the distribution.

;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(in-package #:cl-ppcre)

;;; special variables used by the lexer/parser combo

(defvar *extended-mode-p* nil
  "Whether the parser will start in extended mode.")
(declaim (type boolean *extended-mode-p*))

;;; special variables used by the SCAN function and the matchers

(defvar *string* ""
  "The string which is currently scanned by SCAN.
Will always be coerced to a SIMPLE-STRING.")
(declaim (type simple-string *string*))

(defvar *start-pos* 0
  "Where to start scanning within *STRING*.")
(declaim (type fixnum *start-pos*))

(defvar *real-start-pos* nil
  "The real start of *STRING*. This is for repeated scans and is only used internally.")
(declaim (type (or null fixnum) *real-start-pos*))

(defvar *end-pos* 0
  "Where to stop scanning within *STRING*.")
(declaim (type fixnum *end-pos*))

(defvar *reg-starts* (make-array 0)
  "An array which holds the start positions
of the current register candidates.")
(declaim (type simple-vector *reg-starts*))
  
(defvar *regs-maybe-start* (make-array 0)
  "An array which holds the next start positions
of the current register candidates.")
(declaim (type simple-vector *regs-maybe-start*))

(defvar *reg-ends* (make-array 0)
  "An array which holds the end positions
of the current register candidates.")
(declaim (type simple-vector *reg-ends*))

(defvar *end-string-pos* nil
  "Start of the next possible end-string candidate.")

(defvar *rep-num* 0
  "Counts the number of \"complicated\" repetitions while the matchers
are built.")
(declaim (type fixnum *rep-num*))

(defvar *zero-length-num* 0
  "Counts the number of repetitions the inner regexes of which may
have zero-length while the matchers are built.")
(declaim (type fixnum *zero-length-num*))

(defvar *repeat-counters* (make-array 0
                                      :initial-element 0
                                      :element-type 'fixnum)
  "An array to keep track of how often
repetitive patterns have been tested already.")
(declaim (type (array fixnum (*)) *repeat-counters*))

(defvar *last-pos-stores* (make-array 0)
  "An array to keep track of the last positions
where we saw repetitive patterns.
Only used for patterns which might have zero length.")
(declaim (type simple-vector *last-pos-stores*))

(defvar *use-bmh-matchers* t
  "Whether the scanners created by CREATE-SCANNER should use the \(fast
but large) Boyer-Moore-Horspool matchers.")

(defvar *allow-quoting* nil
  "Whether the parser should support Perl's \\Q and \\E.")

(pushnew :cl-ppcre *features*)

;; stuff for Nikodemus Siivola's HYPERDOC
;; see <http://common-lisp.net/project/hyperdoc/>
;; and <http://www.cliki.net/hyperdoc>

(defvar *hyperdoc-base-uri* "http://weitz.de/cl-ppcre/")

(let ((exported-symbols-alist
       (loop for symbol being the external-symbols of :cl-ppcre
             collect (cons symbol
                           (concatenate 'string
                                        "#"
                                        (string-downcase symbol))))))
  (defun hyperdoc-lookup (symbol type)
    (declare (ignore type))
    (cdr (assoc symbol
                exported-symbols-alist
                :test #'eq))))