/*
 * token - token defines
 *
 * Copyright (C) 1999  David I. Bell
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * Calc 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.
 *
 * A copy of version 2.1 of the GNU Lesser General Public License is
 * distributed with calc under the filename COPYING-LGPL.  You should have
 * received a copy with calc; if not, write to Free Software Foundation, Inc.
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 *
 * @(#) $Revision: 29.4 $
 * @(#) $Id: token.h,v 29.4 2001/06/08 21:00:58 chongo Exp $
 * @(#) $Source: /usr/local/src/cmd/calc/RCS/token.h,v $
 *
 * Under source code control:	1990/02/15 01:48:37
 * File existed as early as:	before 1990
 *
 * Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
 */


#if !defined(__TOKEN_H__)
#define __TOKEN_H__


#if defined(CALC_SRC)	/* if we are building from the calc source tree */
# include "calc/zmath.h"
#else
# include <calc/zmath.h>
#endif


/*
 * Token types
 */
#define T_NULL			0	/* null token */
#define T_LEFTPAREN		1	/* left parenthesis "(" */
#define T_RIGHTPAREN		2	/* right parenthesis ")" */
#define T_LEFTBRACE		3	/* left brace "{" */
#define T_RIGHTBRACE		4	/* right brace "}" */
#define T_SEMICOLON		5	/* end of statement ";" */
#define T_EOF			6	/* end of file */
#define T_COLON			7	/* label character ":" */
#define T_ASSIGN		8	/* assignment "=" */
#define T_PLUS			9	/* plus sign "+" */
#define T_MINUS			10	/* minus sign "-" */
#define T_MULT			11	/* multiply sign "*" */
#define T_DIV			12	/* divide sign "/" */
#define T_MOD			13	/* modulo sign "%" */
#define T_POWER			14	/* power sign "^" or "**" */
#define T_EQ			15	/* equality "==" */
#define T_NE			16	/* notequal "!=" */
#define T_LT			17	/* less than "<" */
#define T_GT			18	/* greater than ">" */
#define T_LE			19	/* less than or equals "<=" */
#define T_GE			20	/* greater than or equals ">=" */
#define T_LEFTBRACKET		21	/* left bracket "[" */
#define T_RIGHTBRACKET		22	/* right bracket "]" */
#define T_SYMBOL		23	/* symbol name */
#define T_STRING		24	/* string value (double quotes) */
#define T_NUMBER		25	/* numeric real constant */
#define T_PLUSEQUALS		26	/* plus equals "+=" */
#define T_MINUSEQUALS		27	/* minus equals "-=" */
#define T_MULTEQUALS		28	/* multiply equals "*=" */
#define T_DIVEQUALS		29	/* divide equals "/=" */
#define T_MODEQUALS		30	/* modulo equals "%=" */
#define T_PLUSPLUS		31	/* plusplus "++" */
#define T_MINUSMINUS		32	/* minusminus "--" */
#define T_COMMA			33	/* comma "," */
#define T_ANDAND		34	/* logical and "&&" */
#define T_OROR			35	/* logical or "||" */
#define T_OLDVALUE		36	/* old value from prev calculation */
#define T_SLASHSLASH		37	/* integer divide "//" */
#define T_NEWLINE		38	/* newline character */
#define T_SLASHSLASHEQUALS	39	/* integer divide equals "//=" */
#define T_AND			40	/* arithmetic and "&" */
#define T_OR			41	/* arithmetic or "|" */
#define T_NOT			42	/* logical not "!" */
#define T_LEFTSHIFT		43	/* left shift "<<" */
#define T_RIGHTSHIFT		44	/* right shift ">>" */
#define T_ANDEQUALS		45	/* and equals "&=" */
#define T_OREQUALS		46	/* or equals "|= */
#define T_LSHIFTEQUALS		47	/* left shift equals "<<=" */
#define T_RSHIFTEQUALS		48	/* right shift equals ">>= */
#define T_POWEREQUALS		49	/* power equals "^=" or "**=" */
#define T_PERIOD		50	/* period "." */
#define T_IMAGINARY		51	/* numeric imaginary constant */
#define T_AMPERSAND		52	/* ampersand "&" */
#define T_QUESTIONMARK		53	/* question mark "?" */
#define T_AT			54	/* at sign "@" */
#define T_DOLLAR		55	/* dollar sign "$" */
#define T_HASH			56	/* hash or pound sign "#" */
#define T_HASHEQUALS		57	/* hash equals "#=" */
#define T_BACKQUOTE		58	/* backquote sign "`" */
#define T_ARROW			59	/* arrow "->" */
#define T_TILDE			60	/* tilde "~" */
#define T_TILDEEQUALS		61	/* tilde equals "~=" */
#define T_BACKSLASH		62	/* backslash or setminus "\" */
#define T_BACKSLASHEQUALS	63	/* backslash equals "\=" */
#define T_POUNDBANG		64	/* #!/usr/local/bin/calc comment */
#define T_POUNDCOMMENT		65	/* #[whitespace] comment */


/*
 * Keyword tokens
 */
#define T_IF			101	/* if keyword */
#define T_ELSE			102	/* else keyword */
#define T_WHILE			103	/* while keyword */
#define T_CONTINUE		104	/* continue keyword */
#define T_BREAK			105	/* break keyword */
#define T_GOTO			106	/* goto keyword */
#define T_RETURN		107	/* return keyword */
#define T_LOCAL			108	/* local keyword */
#define T_GLOBAL		109	/* global keyword */
#define T_STATIC		110	/* static keyword */
#define T_DO			111	/* do keyword */
#define T_FOR			112	/* for keyword */
#define T_SWITCH		113	/* switch keyword */
#define T_CASE			114	/* case keyword */
#define T_DEFAULT		115	/* default keyword */
#define T_QUIT			116	/* quit keyword */
#define T_DEFINE		117	/* define keyword */
#define T_READ			118	/* read keyword */
#define T_SHOW			119	/* show keyword */
#define T_HELP			120	/* help keyword */
#define T_WRITE			121	/* write keyword */
#define T_MAT			122	/* mat keyword */
#define T_OBJ			123	/* obj keyword */
#define T_PRINT			124	/* print keyword */
#define T_CD			125	/* change directory keyword */
#define T_UNDEFINE		126	/* undefine keyword */
#define T_ABORT			127	/* abort operation */


#define iskeyword(n) ((n) > 100)	/* TRUE if token is a keyword */


/*
 * Flags returned describing results of expression parsing.
 */
#define EXPR_RVALUE	0x0001		/* result is an rvalue */
#define EXPR_CONST	0x0002		/* result is constant */
#define EXPR_ASSIGN	0x0004		/* result is an assignment */

#define isrvalue(n)	((n) & EXPR_RVALUE)	/* TRUE if expression is rvalue */
#define islvalue(n)	(((n) & EXPR_RVALUE) == 0)	/* TRUE if expr is lvalue */
#define isconst(n)	((n) & EXPR_CONST)	/* TRUE if expr is constant */
#define isassign(n)	((n) & EXPR_ASSIGN)	/* TRUE if expr is an assignment */


/*
 * Flags for modes for tokenizing.
 */
#define TM_DEFAULT	0x0		/* normal mode */
#define TM_NEWLINES	0x1		/* treat any newline as a token */
#define TM_ALLSYMS	0x2		/* treat almost everything as a symbol */


extern long errorcount;		/* number of errors found */

extern long tokenstring(void);
extern long tokennumber(void);
extern char *tokensymbol(void);
extern void inittokens(void);
extern int tokenmode(int flag);
extern int gettoken(void);
extern void rescantoken(void);
extern void scanerror(int, char *, ...);


#endif /* !__TOKEN_H__ */
