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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CL-INTERPOL; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/cl-interpol/util.lisp,v 1.12 2008/07/23 14:41:37 edi Exp $
;;; Copyright (c) 2003-2008, 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-interpol)
(define-condition simple-reader-error (simple-condition reader-error)
()
(:documentation "A reader error which can be signalled by ERROR."))
(defmacro signal-reader-error (format-control &rest format-arguments)
"Like ERROR but signals a SIMPLE-READER-ERROR for the stream
*STREAM*."
`(error 'simple-reader-error
:stream *stream*
:format-control ,format-control
:format-arguments (list ,@format-arguments)))
(defun string-list-to-string (string-list)
"Concatenates a list of strings to one string."
;; this function was originally provided by JP Massar for CL-PPCRE;
;; note that we can't use APPLY with CONCATENATE here because of
;; CALL-ARGUMENTS-LIMIT
(let ((total-size 0))
(dolist (string string-list)
(incf total-size (length string)))
(let ((result-string (make-array total-size :element-type 'character))
(curr-pos 0))
(dolist (string string-list)
(replace result-string string :start1 curr-pos)
(incf curr-pos (length string)))
result-string)))
(defun get-end-delimiter (start-delimiter delimiters &key errorp)
"Find the closing delimiter corresponding to the opening delimiter
START-DELIMITER in a list DELIMITERS which is formatted like
*OUTER-DELIMITERS*. If ERRORP is true, signal an error if none was
found, otherwise return NIL."
(loop for element in delimiters
if (eql start-delimiter element)
do (return-from get-end-delimiter start-delimiter)
else if (and (consp element)
(char= start-delimiter (car element)))
do (return-from get-end-delimiter (cdr element)))
(when errorp
(signal-reader-error "~S not allowed as a delimiter here" start-delimiter)))
(declaim (inline make-collector))
(defun make-collector ()
"Create an empty string which can be extended by
VECTOR-PUSH-EXTEND."
(make-array 0
:element-type 'character
:fill-pointer t
:adjustable t))
(declaim (inline make-char-from-code))
(defun make-char-from-code (number)
"Create character from char-code NUMBER. NUMBER can be NIL which is
interpreted as 0."
;; Only look at rightmost eight bits in compliance with Perl
(let ((code (logand #o377 (or number 0))))
(or (and (< code char-code-limit)
(code-char code))
(signal-reader-error "No character for char-code #x~X"
number))))
(declaim (inline lower-case-p*))
(defun lower-case-p* (char)
"Whether CHAR is a character which has case and is lowercase."
(or (not (both-case-p char))
(lower-case-p char)))
(defmacro read-char* ()
"Convenience macro because we always read from the same string with
the same arguments."
`(read-char *stream* t nil t))
(defmacro peek-char* ()
"Convenience macro because we always peek at the same string with
the same arguments."
`(peek-char nil *stream* t nil t))
(declaim (inline copy-readtable*))
(defun copy-readtable* ()
"Returns a copy of the readtable which was current when
INTERPOL-READER was invoked. Memoizes its result."
(or *readtable-copy*
(setq *readtable-copy* (copy-readtable))))
(declaim (inline nsubvec))
(defun nsubvec (sequence start &optional (end (length sequence)))
"Return a subvector by pointing to location in original vector."
(make-array (- end start)
:element-type (array-element-type sequence)
:displaced-to sequence
:displaced-index-offset start))
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