/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/

 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.

 * The Original Code is Rhino code, released
 * May 6, 1999.

 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1997-1999 Netscape Communications Corporation. All
 * Rights Reserved.

 * Contributor(s): 

 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (the "GPL"), in which case the
 * provisions of the GPL are applicable instead of those above.
 * If you wish to allow use of your version of this file only
 * under the terms of the GPL and not to allow others to use your
 * version of this file under the NPL, indicate your decision by
 * deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL.  If you do not delete
 * the provisions above, a recipient may use your version of this
 * file under either the NPL or the GPL.
 */
#ifdef DTOA

#ifndef _JS_DTOA_H_
#define _JS_DTOA_H_

#include "js-types.h"
#include "js-biginteger.h"
#include "js-stringbuffer.h"

/* Classes */
class JSDToA {
    protected:
	/*
	 * "-0.0000...(1073 zeros after decimal point)...0001\0" is the
	 * longest string that we could produce, which occurs
	 * when printing -5e-324 in binary.
 	 * We could compute a better estimate of the size of the output
	 * string and malloc fewer bytes depending on d and base,
	 * but why bother?
 	*/
	static const int	DTOBASESTR_BUFFER_SIZE = 1078;

	static const int	Frac_mask = 0xfffff;
	static const int	Exp_shift = 20;
	static const int	Exp_msk1 = 0x100000;
	static const int	Bias = 1023;
	static const int	P = 53;
 
	static const int	Exp_shift1 = 20;
	static const int	Exp_mask  = 0x7ff00000;
	static const int	Bndry_mask  = 0xfffff;
	static const int	Log2P = 1;
 
	static const int	Sign_bit = 0x80000000;
	static const int	Exp_11  = 0x3ff00000;
        static const int	Ten_pmax = 22;
        static const int	Quick_max = 14;
        static const int	Bletch = 0x10;
        static const int	Frac_mask1 = 0xfffff;
        static const int	Int_max = 14;
        static const int	n_bigtens = 5;

	static const double	tens[23];
	static const double	bigtens[5];
	/* Mapping of JSDToStrMode -> JS_dtoa mode */
	static const int	dtoaModes[5];

    public:
	/* Either fixed or exponential format; round-trip */
	static const int	DTOSTR_STANDARD = 0;
	/* Always exponential format; round-trip */
	static const int	DTOSTR_STANDARD_EXPONENTIAL = 1;
	/* Round to <precision> digits after the decimal point;
	   exponential if number is large */
	static const int	DTOSTR_FIXED = 2;
	/* Always exponential format; <precision> significant digits */
	static const int	DTOSTR_EXPONENTIAL = 3;
	/* Either fixed or exponential format; <precision> significant digits */
	static const int	DTOSTR_PRECISION = 4;

    protected:
	static	int64_t	doubleToLongBits(double d);
	static	double	longBitsToDouble(int64_t bits);
	static	jsChar_t
			BASEDIGIT(int digit);
	static	int	lo0bits(int32_t y);
	static	int	hi0bits(int32_t x);
	static	void	stuffBits(JSBigInteger::Digit *bits, int offset,
				int val);
	static	JSBigInteger
			d2b(JSContext *cx, double d, int *e, int *bits);
	static	int32_t	word0(double d);
	static	double	setWord0(double d, int32_t i);
	static	int32_t	word1(double d);
	static	JSBigInteger
			pow5mult(JSContext *cx, JSBigInteger &b, int k);
	static	jsBool_t
			roundOff(JSStringBuffer *buf);

    public:
	static jsString_t
			JS_dtobasestr(JSContext *cx, int base, double d);
	static int	JS_dtoa(JSContext *cx, double d, int mode,
				jsBool_t biasUp, int ndigits, jsBool_t *sign,
				JSStringBuffer *buf);
	static void	JS_dtostr(JSContext *cx, JSStringBuffer *buffer,
				int mode, int precision, double d);
};

#endif /* _JS_DTOA_H_ */

#endif /* DTOA */

