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+/* scanning.h
+
+ Copyright 2009 Taco Hoekwater <taco@luatex.org>
+
+ This file is part of LuaTeX.
+
+ LuaTeX is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ LuaTeX is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
+
+/* $Id: scanning.h 3376 2010-01-25 16:50:23Z taco $ */
+
+#ifndef SCANNING_H
+# define SCANNING_H
+
+typedef enum {
+ int_val_level = 0, /* integer values */
+ attr_val_level, /* integer values */
+ dimen_val_level, /* dimension values */
+ glue_val_level, /* glue specifications */
+ mu_val_level, /* math glue specifications */
+ dir_val_level, /* directions */
+ ident_val_level, /* font identifier */
+ tok_val_level, /* token lists */
+} value_level_code;
+
+extern void scan_left_brace(void);
+extern void scan_optional_equals(void);
+
+extern int cur_val; /* value returned by numeric scanners */
+extern int cur_val1; /* delcodes are sometimes 51 digits */
+extern int cur_val_level; /* the ``level'' of this value */
+
+extern void scan_something_simple(halfword cmd, halfword subitem);
+extern void scan_something_internal(int level, boolean negative);
+
+
+extern void scan_limited_int(int max, const char *name);
+
+# define scan_register_num() scan_limited_int(65535,"register code")
+# define scan_mark_num() scan_limited_int(65535,"marks code")
+# define scan_char_num() scan_limited_int(biggest_char,"character code")
+# define scan_four_bit_int() scan_limited_int(15,NULL)
+# define scan_math_family_int() scan_limited_int(265,"math family")
+# define scan_real_fifteen_bit_int() scan_limited_int(32767,"mathchar")
+# define scan_big_fifteen_bit_int() scan_limited_int(0x7FFFFFF,"extended mathchar")
+# define scan_twenty_seven_bit_int() scan_limited_int(0777777777,"delimiter code")
+
+extern void scan_fifteen_bit_int(void);
+extern void scan_fifty_one_bit_int(void);
+extern void scan_string_argument(void);
+extern void scan_four_bit_int_or_18(void);
+
+# define octal_token (other_token+'\'') /* apostrophe, indicates an octal constant */
+# define hex_token (other_token+'"') /* double quote, indicates a hex constant */
+# define alpha_token (other_token+'`') /* reverse apostrophe, precedes alpha constants */
+# define point_token (other_token+'.') /* decimal point */
+# define continental_point_token (other_token+',') /* decimal point, Eurostyle */
+# define infinity 017777777777 /* the largest positive value that \TeX\ knows */
+# define zero_token (other_token+'0') /* zero, the smallest digit */
+# define A_token (letter_token+'A') /* the smallest special hex digit */
+# define other_A_token (other_token+'A')
+ /* special hex digit of type |other_char| */
+
+extern int radix;
+
+extern void scan_int(void);
+
+extern int cur_order;
+
+# define scan_normal_dimen() scan_dimen(false,false,false)
+
+extern void scan_dimen(boolean mu, boolean inf, boolean shortcut);
+extern void scan_glue(int level);
+extern void scan_scaled(void);
+
+extern halfword the_toks(void);
+extern str_number the_scanned_result(void);
+extern void set_font_dimen(void);
+extern void get_font_dimen(void);
+
+# define default_rule 26214 /* 0.4\thinspace pt */
+
+extern halfword scan_rule_spec(void);
+
+extern void scan_font_ident(void);
+extern void scan_general_text(void);
+extern void get_x_or_protected(void);
+extern halfword scan_toks(boolean macrodef, boolean xpand);
+
+
+extern void scan_normal_glue(void);
+extern void scan_mu_glue(void);
+
+extern int add_or_sub(int x, int y, int max_answer, boolean negative);
+extern int quotient(int n, int d);
+extern int fract(int x, int n, int d, int max_answer);
+extern void scan_expr(void);
+
+
+
+#endif