File: scanchar.h

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/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: scanchar.h 8022 2007-06-05 22:23:38Z giles $ */
/* Definitions for token scanner character type table */
/* Requires scommon.h */

#ifndef scanchar_INCLUDED
#  define scanchar_INCLUDED

/*
 * An array for fast scanning of names, numbers, and hex strings.
 * Indexed by character code (including exceptions), it contains:
 *      0 - max_radix-1 for valid digits,
 *      ctype_name for other characters valid in names,
 *      ctype_btoken for characters introducing binary tokens
 *        (if the binary token feature is enabled),
 *      ctype_space for whitespace characters,
 *      ctype_exception for exceptions (see scommon.h), and
 *      ctype_other for everything else.
 * Exceptions are negative values; we bias the table origin accordingly.
 *
 * NOTE: This table is defined in iscantab.c and used in a variety of places.
 * If any of the values below change, you must edit the table.
 */
extern const byte scan_char_array[max_stream_exception + 256];

#define scan_char_decoder (&scan_char_array[max_stream_exception])
#define min_radix 2
#define max_radix 36
#define ctype_name 100
#define ctype_btoken 101
#define ctype_space 102
#define ctype_other 103
#define ctype_exception 104
/* Special characters with no \xxx representation */
#define char_NULL 0
#define char_EOT 004		/* ^D, job delimiter */
#define char_VT 013		/* ^K, vertical tab */
#define char_DOS_EOF 032	/* ^Z */
/*
 * Most systems define '\n' as 0x0a and '\r' as 0x0d; however, OS-9
 * has '\n' = '\r' = 0x0d and '\l' = 0x0a.  To deal with this,
 * we introduce abstract characters char_CR and char_EOL such that
 * any of [char_CR], [char_CR char_EOL], or [char_EOL] is recognized
 * as an end-of-line sequence.
 */
#define char_CR '\r'
#if '\r' == '\n'
#  define char_EOL 0x0a		/* non-OS-9 compilers complain about '\l' */
#else
#  define char_EOL '\n'
#endif

#endif /* scanchar_INCLUDED */