953 lines
29 KiB
C++
953 lines
29 KiB
C++
/*
|
|
**********************************************************************
|
|
* Copyright (C) 1997-2012, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
**********************************************************************
|
|
*
|
|
* File DIGITLST.CPP
|
|
*
|
|
* Modification History:
|
|
*
|
|
* Date Name Description
|
|
* 03/21/97 clhuang Converted from java.
|
|
* 03/21/97 clhuang Implemented with new APIs.
|
|
* 03/27/97 helena Updated to pass the simple test after code review.
|
|
* 03/31/97 aliu Moved isLONG_MIN to here, and fixed it.
|
|
* 04/15/97 aliu Changed MAX_COUNT to DBL_DIG. Changed Digit to char.
|
|
* Reworked representation by replacing fDecimalAt
|
|
* with fExponent.
|
|
* 04/16/97 aliu Rewrote set() and getDouble() to use sprintf/atof
|
|
* to do digit conversion.
|
|
* 09/09/97 aliu Modified for exponential notation support.
|
|
* 08/02/98 stephen Added nearest/even rounding
|
|
* Fixed bug in fitsIntoLong
|
|
******************************************************************************
|
|
*/
|
|
|
|
#include "digitlst.h"
|
|
|
|
#if !UCONFIG_NO_FORMATTING
|
|
#include "unicode/putil.h"
|
|
#include "charstr.h"
|
|
#include "cmemory.h"
|
|
#include "cstring.h"
|
|
#include "mutex.h"
|
|
#include "putilimp.h"
|
|
#include "uassert.h"
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <limits>
|
|
|
|
// ***************************************************************************
|
|
// class DigitList
|
|
// A wrapper onto decNumber.
|
|
// Used to be standalone.
|
|
// ***************************************************************************
|
|
|
|
/**
|
|
* This is the zero digit. The base for the digits returned by getDigit()
|
|
* Note that it is the platform invariant digit, and is not Unicode.
|
|
*/
|
|
#define kZero '0'
|
|
|
|
|
|
/* Only for 32 bit numbers. Ignore the negative sign. */
|
|
//static const char LONG_MIN_REP[] = "2147483648";
|
|
//static const char I64_MIN_REP[] = "9223372036854775808";
|
|
|
|
|
|
static const uint8_t DIGIT_HAVE_NONE=0;
|
|
static const uint8_t DIGIT_HAVE_DOUBLE=1;
|
|
static const uint8_t DIGIT_HAVE_INT64=2;
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
// -------------------------------------
|
|
// default constructor
|
|
|
|
DigitList::DigitList()
|
|
{
|
|
uprv_decContextDefault(&fContext, DEC_INIT_BASE);
|
|
fContext.traps = 0;
|
|
uprv_decContextSetRounding(&fContext, DEC_ROUND_HALF_EVEN);
|
|
fContext.digits = fStorage.getCapacity();
|
|
|
|
fDecNumber = fStorage.getAlias();
|
|
uprv_decNumberZero(fDecNumber);
|
|
|
|
internalSetDouble(0.0);
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
DigitList::~DigitList()
|
|
{
|
|
}
|
|
|
|
// -------------------------------------
|
|
// copy constructor
|
|
|
|
DigitList::DigitList(const DigitList &other)
|
|
{
|
|
fDecNumber = fStorage.getAlias();
|
|
*this = other;
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
// assignment operator
|
|
|
|
DigitList&
|
|
DigitList::operator=(const DigitList& other)
|
|
{
|
|
if (this != &other)
|
|
{
|
|
uprv_memcpy(&fContext, &other.fContext, sizeof(decContext));
|
|
|
|
if (other.fStorage.getCapacity() > fStorage.getCapacity()) {
|
|
fDecNumber = fStorage.resize(other.fStorage.getCapacity());
|
|
}
|
|
// Always reset the fContext.digits, even if fDecNumber was not reallocated,
|
|
// because above we copied fContext from other.fContext.
|
|
fContext.digits = fStorage.getCapacity();
|
|
uprv_decNumberCopy(fDecNumber, other.fDecNumber);
|
|
|
|
{
|
|
// fDouble is lazily created and cached.
|
|
// Avoid potential races with that happening with other.fDouble
|
|
// while we are doing the assignment.
|
|
Mutex mutex;
|
|
|
|
if(other.fHave==kDouble) {
|
|
fUnion.fDouble = other.fUnion.fDouble;
|
|
} else if(other.fHave==kInt64) {
|
|
fUnion.fInt64 = other.fUnion.fInt64;
|
|
}
|
|
fHave = other.fHave;
|
|
}
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
// -------------------------------------
|
|
// operator == (does not exactly match the old DigitList function)
|
|
|
|
UBool
|
|
DigitList::operator==(const DigitList& that) const
|
|
{
|
|
if (this == &that) {
|
|
return TRUE;
|
|
}
|
|
decNumber n; // Has space for only a none digit value.
|
|
decContext c;
|
|
uprv_decContextDefault(&c, DEC_INIT_BASE);
|
|
c.digits = 1;
|
|
c.traps = 0;
|
|
|
|
uprv_decNumberCompare(&n, this->fDecNumber, that.fDecNumber, &c);
|
|
UBool result = decNumberIsZero(&n);
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------
|
|
// comparison function. Returns
|
|
// Not Comparable : -2
|
|
// < : -1
|
|
// == : 0
|
|
// > : +1
|
|
int32_t DigitList::compare(const DigitList &other) {
|
|
decNumber result;
|
|
int32_t savedDigits = fContext.digits;
|
|
fContext.digits = 1;
|
|
uprv_decNumberCompare(&result, this->fDecNumber, other.fDecNumber, &fContext);
|
|
fContext.digits = savedDigits;
|
|
if (decNumberIsZero(&result)) {
|
|
return 0;
|
|
} else if (decNumberIsSpecial(&result)) {
|
|
return -2;
|
|
} else if (result.bits & DECNEG) {
|
|
return -1;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
// Reduce - remove trailing zero digits.
|
|
void
|
|
DigitList::reduce() {
|
|
uprv_decNumberReduce(fDecNumber, fDecNumber, &fContext);
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
// trim - remove trailing fraction zero digits.
|
|
void
|
|
DigitList::trim() {
|
|
uprv_decNumberTrim(fDecNumber);
|
|
}
|
|
|
|
// -------------------------------------
|
|
// Resets the digit list; sets all the digits to zero.
|
|
|
|
void
|
|
DigitList::clear()
|
|
{
|
|
uprv_decNumberZero(fDecNumber);
|
|
uprv_decContextSetRounding(&fContext, DEC_ROUND_HALF_EVEN);
|
|
internalSetDouble(0.0);
|
|
}
|
|
|
|
|
|
/**
|
|
* Formats a int64_t number into a base 10 string representation, and NULL terminates it.
|
|
* @param number The number to format
|
|
* @param outputStr The string to output to. Must be at least MAX_DIGITS+2 in length (21),
|
|
* to hold the longest int64_t value.
|
|
* @return the number of digits written, not including the sign.
|
|
*/
|
|
static int32_t
|
|
formatBase10(int64_t number, char *outputStr) {
|
|
// The number is output backwards, starting with the LSD.
|
|
// Fill the buffer from the far end. After the number is complete,
|
|
// slide the string contents to the front.
|
|
|
|
const int32_t MAX_IDX = MAX_DIGITS+2;
|
|
int32_t destIdx = MAX_IDX;
|
|
outputStr[--destIdx] = 0;
|
|
|
|
int64_t n = number;
|
|
if (number < 0) { // Negative numbers are slightly larger than a postive
|
|
outputStr[--destIdx] = (char)(-(n % 10) + kZero);
|
|
n /= -10;
|
|
}
|
|
do {
|
|
outputStr[--destIdx] = (char)(n % 10 + kZero);
|
|
n /= 10;
|
|
} while (n > 0);
|
|
|
|
if (number < 0) {
|
|
outputStr[--destIdx] = '-';
|
|
}
|
|
|
|
// Slide the number to the start of the output str
|
|
U_ASSERT(destIdx >= 0);
|
|
int32_t length = MAX_IDX - destIdx;
|
|
uprv_memmove(outputStr, outputStr+MAX_IDX-length, length);
|
|
|
|
return length;
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
//
|
|
// setRoundingMode()
|
|
// For most modes, the meaning and names are the same between the decNumber library
|
|
// (which DigitList follows) and the ICU Formatting Rounding Mode values.
|
|
// The flag constants are different, however.
|
|
//
|
|
// Note that ICU's kRoundingUnnecessary is not implemented directly by DigitList.
|
|
// This mode, inherited from Java, means that numbers that would not format exactly
|
|
// will return an error when formatting is attempted.
|
|
|
|
void
|
|
DigitList::setRoundingMode(DecimalFormat::ERoundingMode m) {
|
|
enum rounding r;
|
|
|
|
switch (m) {
|
|
case DecimalFormat::kRoundCeiling: r = DEC_ROUND_CEILING; break;
|
|
case DecimalFormat::kRoundFloor: r = DEC_ROUND_FLOOR; break;
|
|
case DecimalFormat::kRoundDown: r = DEC_ROUND_DOWN; break;
|
|
case DecimalFormat::kRoundUp: r = DEC_ROUND_UP; break;
|
|
case DecimalFormat::kRoundHalfEven: r = DEC_ROUND_HALF_EVEN; break;
|
|
case DecimalFormat::kRoundHalfDown: r = DEC_ROUND_HALF_DOWN; break;
|
|
case DecimalFormat::kRoundHalfUp: r = DEC_ROUND_HALF_UP; break;
|
|
case DecimalFormat::kRoundUnnecessary: r = DEC_ROUND_HALF_EVEN; break;
|
|
default:
|
|
// TODO: how to report the problem?
|
|
// Leave existing mode unchanged.
|
|
r = uprv_decContextGetRounding(&fContext);
|
|
}
|
|
uprv_decContextSetRounding(&fContext, r);
|
|
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
DigitList::setPositive(UBool s) {
|
|
if (s) {
|
|
fDecNumber->bits &= ~DECNEG;
|
|
} else {
|
|
fDecNumber->bits |= DECNEG;
|
|
}
|
|
internalClear();
|
|
}
|
|
// -------------------------------------
|
|
|
|
void
|
|
DigitList::setDecimalAt(int32_t d) {
|
|
U_ASSERT((fDecNumber->bits & DECSPECIAL) == 0); // Not Infinity or NaN
|
|
U_ASSERT(d-1>-999999999);
|
|
U_ASSERT(d-1< 999999999);
|
|
int32_t adjustedDigits = fDecNumber->digits;
|
|
if (decNumberIsZero(fDecNumber)) {
|
|
// Account for difference in how zero is represented between DigitList & decNumber.
|
|
adjustedDigits = 0;
|
|
}
|
|
fDecNumber->exponent = d - adjustedDigits;
|
|
internalClear();
|
|
}
|
|
|
|
int32_t
|
|
DigitList::getDecimalAt() {
|
|
U_ASSERT((fDecNumber->bits & DECSPECIAL) == 0); // Not Infinity or NaN
|
|
if (decNumberIsZero(fDecNumber) || ((fDecNumber->bits & DECSPECIAL) != 0)) {
|
|
return fDecNumber->exponent; // Exponent should be zero for these cases.
|
|
}
|
|
return fDecNumber->exponent + fDecNumber->digits;
|
|
}
|
|
|
|
void
|
|
DigitList::setCount(int32_t c) {
|
|
U_ASSERT(c <= fContext.digits);
|
|
if (c == 0) {
|
|
// For a value of zero, DigitList sets all fields to zero, while
|
|
// decNumber keeps one digit (with that digit being a zero)
|
|
c = 1;
|
|
fDecNumber->lsu[0] = 0;
|
|
}
|
|
fDecNumber->digits = c;
|
|
internalClear();
|
|
}
|
|
|
|
int32_t
|
|
DigitList::getCount() const {
|
|
if (decNumberIsZero(fDecNumber) && fDecNumber->exponent==0) {
|
|
// The extra test for exponent==0 is needed because parsing sometimes appends
|
|
// zero digits. It's bogus, decimalFormatter parsing needs to be cleaned up.
|
|
return 0;
|
|
} else {
|
|
return fDecNumber->digits;
|
|
}
|
|
}
|
|
|
|
void
|
|
DigitList::setDigit(int32_t i, char v) {
|
|
int32_t count = fDecNumber->digits;
|
|
U_ASSERT(i<count);
|
|
U_ASSERT(v>='0' && v<='9');
|
|
v &= 0x0f;
|
|
fDecNumber->lsu[count-i-1] = v;
|
|
internalClear();
|
|
}
|
|
|
|
char
|
|
DigitList::getDigit(int32_t i) {
|
|
int32_t count = fDecNumber->digits;
|
|
U_ASSERT(i<count);
|
|
return fDecNumber->lsu[count-i-1] + '0';
|
|
}
|
|
|
|
// copied from DigitList::getDigit()
|
|
uint8_t
|
|
DigitList::getDigitValue(int32_t i) {
|
|
int32_t count = fDecNumber->digits;
|
|
U_ASSERT(i<count);
|
|
return fDecNumber->lsu[count-i-1];
|
|
}
|
|
|
|
// -------------------------------------
|
|
// Appends the digit to the digit list if it's not out of scope.
|
|
// Ignores the digit, otherwise.
|
|
//
|
|
// This function is horribly inefficient to implement with decNumber because
|
|
// the digits are stored least significant first, which requires moving all
|
|
// existing digits down one to make space for the new one to be appended.
|
|
//
|
|
void
|
|
DigitList::append(char digit)
|
|
{
|
|
U_ASSERT(digit>='0' && digit<='9');
|
|
// Ignore digits which exceed the precision we can represent
|
|
// And don't fix for larger precision. Fix callers instead.
|
|
if (decNumberIsZero(fDecNumber)) {
|
|
// Zero needs to be special cased because of the difference in the way
|
|
// that the old DigitList and decNumber represent it.
|
|
// digit cout was zero for digitList, is one for decNumber
|
|
fDecNumber->lsu[0] = digit & 0x0f;
|
|
fDecNumber->digits = 1;
|
|
fDecNumber->exponent--; // To match the old digit list implementation.
|
|
} else {
|
|
int32_t nDigits = fDecNumber->digits;
|
|
if (nDigits < fContext.digits) {
|
|
int i;
|
|
for (i=nDigits; i>0; i--) {
|
|
fDecNumber->lsu[i] = fDecNumber->lsu[i-1];
|
|
}
|
|
fDecNumber->lsu[0] = digit & 0x0f;
|
|
fDecNumber->digits++;
|
|
// DigitList emulation - appending doesn't change the magnitude of existing
|
|
// digits. With decNumber's decimal being after the
|
|
// least signficant digit, we need to adjust the exponent.
|
|
fDecNumber->exponent--;
|
|
}
|
|
}
|
|
internalClear();
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* Currently, getDouble() depends on strtod() to do its conversion.
|
|
*
|
|
* WARNING!!
|
|
* This is an extremely costly function. ~1/2 of the conversion time
|
|
* can be linked to this function.
|
|
*/
|
|
double
|
|
DigitList::getDouble() const
|
|
{
|
|
static char gDecimal = 0;
|
|
char decimalSeparator;
|
|
{
|
|
Mutex mutex;
|
|
if (fHave == kDouble) {
|
|
return fUnion.fDouble;
|
|
} else if(fHave == kInt64) {
|
|
return (double)fUnion.fInt64;
|
|
}
|
|
decimalSeparator = gDecimal;
|
|
}
|
|
|
|
if (decimalSeparator == 0) {
|
|
// We need to know the decimal separator character that will be used with strtod().
|
|
// Depends on the C runtime global locale.
|
|
// Most commonly is '.'
|
|
// TODO: caching could fail if the global locale is changed on the fly.
|
|
char rep[MAX_DIGITS];
|
|
sprintf(rep, "%+1.1f", 1.0);
|
|
decimalSeparator = rep[2];
|
|
}
|
|
|
|
double tDouble = 0.0;
|
|
if (isZero()) {
|
|
tDouble = 0.0;
|
|
if (decNumberIsNegative(fDecNumber)) {
|
|
tDouble /= -1;
|
|
}
|
|
} else if (isInfinite()) {
|
|
if (std::numeric_limits<double>::has_infinity) {
|
|
tDouble = std::numeric_limits<double>::infinity();
|
|
} else {
|
|
tDouble = std::numeric_limits<double>::max();
|
|
}
|
|
if (!isPositive()) {
|
|
tDouble = -tDouble; //this was incorrectly "-fDouble" originally.
|
|
}
|
|
} else {
|
|
MaybeStackArray<char, MAX_DBL_DIGITS+18> s;
|
|
// Note: 14 is a magic constant from the decNumber library documentation,
|
|
// the max number of extra characters beyond the number of digits
|
|
// needed to represent the number in string form. Add a few more
|
|
// for the additional digits we retain.
|
|
|
|
// Round down to appx. double precision, if the number is longer than that.
|
|
// Copy the number first, so that we don't modify the original.
|
|
if (getCount() > MAX_DBL_DIGITS + 3) {
|
|
DigitList numToConvert(*this);
|
|
numToConvert.reduce(); // Removes any trailing zeros, so that digit count is good.
|
|
numToConvert.round(MAX_DBL_DIGITS+3);
|
|
uprv_decNumberToString(numToConvert.fDecNumber, s.getAlias());
|
|
// TODO: how many extra digits should be included for an accurate conversion?
|
|
} else {
|
|
uprv_decNumberToString(this->fDecNumber, s.getAlias());
|
|
}
|
|
U_ASSERT(uprv_strlen(&s[0]) < MAX_DBL_DIGITS+18);
|
|
|
|
if (decimalSeparator != '.') {
|
|
char *decimalPt = strchr(s.getAlias(), '.');
|
|
if (decimalPt != NULL) {
|
|
*decimalPt = decimalSeparator;
|
|
}
|
|
}
|
|
char *end = NULL;
|
|
tDouble = uprv_strtod(s.getAlias(), &end);
|
|
}
|
|
{
|
|
Mutex mutex;
|
|
DigitList *nonConstThis = const_cast<DigitList *>(this);
|
|
nonConstThis->internalSetDouble(tDouble);
|
|
gDecimal = decimalSeparator;
|
|
}
|
|
return tDouble;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* convert this number to an int32_t. Round if there is a fractional part.
|
|
* Return zero if the number cannot be represented.
|
|
*/
|
|
int32_t DigitList::getLong() /*const*/
|
|
{
|
|
int32_t result = 0;
|
|
if (fDecNumber->digits + fDecNumber->exponent > 10) {
|
|
// Overflow, absolute value too big.
|
|
return result;
|
|
}
|
|
if (fDecNumber->exponent != 0) {
|
|
// Force to an integer, with zero exponent, rounding if necessary.
|
|
// (decNumberToInt32 will only work if the exponent is exactly zero.)
|
|
DigitList copy(*this);
|
|
DigitList zero;
|
|
uprv_decNumberQuantize(copy.fDecNumber, copy.fDecNumber, zero.fDecNumber, &fContext);
|
|
result = uprv_decNumberToInt32(copy.fDecNumber, &fContext);
|
|
} else {
|
|
result = uprv_decNumberToInt32(fDecNumber, &fContext);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* convert this number to an int64_t. Truncate if there is a fractional part.
|
|
* Return zero if the number cannot be represented.
|
|
*/
|
|
int64_t DigitList::getInt64() /*const*/ {
|
|
if(fHave==kInt64) {
|
|
return fUnion.fInt64;
|
|
}
|
|
// Truncate if non-integer.
|
|
// Return 0 if out of range.
|
|
// Range of in64_t is -9223372036854775808 to 9223372036854775807 (19 digits)
|
|
//
|
|
if (fDecNumber->digits + fDecNumber->exponent > 19) {
|
|
// Overflow, absolute value too big.
|
|
return 0;
|
|
}
|
|
|
|
// The number of integer digits may differ from the number of digits stored
|
|
// in the decimal number.
|
|
// for 12.345 numIntDigits = 2, number->digits = 5
|
|
// for 12E4 numIntDigits = 6, number->digits = 2
|
|
// The conversion ignores the fraction digits in the first case,
|
|
// and fakes up extra zero digits in the second.
|
|
// TODO: It would be faster to store a table of powers of ten to multiply by
|
|
// instead of looping over zero digits, multiplying each time.
|
|
|
|
int32_t numIntDigits = fDecNumber->digits + fDecNumber->exponent;
|
|
uint64_t value = 0;
|
|
for (int32_t i = 0; i < numIntDigits; i++) {
|
|
// Loop is iterating over digits starting with the most significant.
|
|
// Numbers are stored with the least significant digit at index zero.
|
|
int32_t digitIndex = fDecNumber->digits - i - 1;
|
|
int32_t v = (digitIndex >= 0) ? fDecNumber->lsu[digitIndex] : 0;
|
|
value = value * (uint64_t)10 + (uint64_t)v;
|
|
}
|
|
|
|
if (decNumberIsNegative(fDecNumber)) {
|
|
value = ~value;
|
|
value += 1;
|
|
}
|
|
int64_t svalue = (int64_t)value;
|
|
|
|
// Check overflow. It's convenient that the MSD is 9 only on overflow, the amount of
|
|
// overflow can't wrap too far. The test will also fail -0, but
|
|
// that does no harm; the right answer is 0.
|
|
if (numIntDigits == 19) {
|
|
if (( decNumberIsNegative(fDecNumber) && svalue>0) ||
|
|
(!decNumberIsNegative(fDecNumber) && svalue<0)) {
|
|
svalue = 0;
|
|
}
|
|
}
|
|
|
|
return svalue;
|
|
}
|
|
|
|
|
|
/**
|
|
* Return a string form of this number.
|
|
* Format is as defined by the decNumber library, for interchange of
|
|
* decimal numbers.
|
|
*/
|
|
void DigitList::getDecimal(CharString &str, UErrorCode &status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
// A decimal number in string form can, worst case, be 14 characters longer
|
|
// than the number of digits. So says the decNumber library doc.
|
|
int32_t maxLength = fDecNumber->digits + 14;
|
|
int32_t capacity = 0;
|
|
char *buffer = str.clear().getAppendBuffer(maxLength, 0, capacity, status);
|
|
if (U_FAILURE(status)) {
|
|
return; // Memory allocation error on growing the string.
|
|
}
|
|
U_ASSERT(capacity >= maxLength);
|
|
uprv_decNumberToString(this->fDecNumber, buffer);
|
|
U_ASSERT((int32_t)uprv_strlen(buffer) <= maxLength);
|
|
str.append(buffer, -1, status);
|
|
}
|
|
|
|
/**
|
|
* Return true if this is an integer value that can be held
|
|
* by an int32_t type.
|
|
*/
|
|
UBool
|
|
DigitList::fitsIntoLong(UBool ignoreNegativeZero) /*const*/
|
|
{
|
|
if (decNumberIsSpecial(this->fDecNumber)) {
|
|
// NaN or Infinity. Does not fit in int32.
|
|
return FALSE;
|
|
}
|
|
uprv_decNumberTrim(this->fDecNumber);
|
|
if (fDecNumber->exponent < 0) {
|
|
// Number contains fraction digits.
|
|
return FALSE;
|
|
}
|
|
if (decNumberIsZero(this->fDecNumber) && !ignoreNegativeZero &&
|
|
(fDecNumber->bits & DECNEG) != 0) {
|
|
// Negative Zero, not ingored. Cannot represent as a long.
|
|
return FALSE;
|
|
}
|
|
if (fDecNumber->digits + fDecNumber->exponent < 10) {
|
|
// The number is 9 or fewer digits.
|
|
// The max and min int32 are 10 digts, so this number fits.
|
|
// This is the common case.
|
|
return TRUE;
|
|
}
|
|
|
|
// TODO: Should cache these constants; construction is relatively costly.
|
|
// But not of huge consequence; they're only needed for 10 digit ints.
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
DigitList min32; min32.set("-2147483648", status);
|
|
if (this->compare(min32) < 0) {
|
|
return FALSE;
|
|
}
|
|
DigitList max32; max32.set("2147483647", status);
|
|
if (this->compare(max32) > 0) {
|
|
return FALSE;
|
|
}
|
|
if (U_FAILURE(status)) {
|
|
return FALSE;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Return true if the number represented by this object can fit into
|
|
* a long.
|
|
*/
|
|
UBool
|
|
DigitList::fitsIntoInt64(UBool ignoreNegativeZero) /*const*/
|
|
{
|
|
if (decNumberIsSpecial(this->fDecNumber)) {
|
|
// NaN or Infinity. Does not fit in int32.
|
|
return FALSE;
|
|
}
|
|
uprv_decNumberTrim(this->fDecNumber);
|
|
if (fDecNumber->exponent < 0) {
|
|
// Number contains fraction digits.
|
|
return FALSE;
|
|
}
|
|
if (decNumberIsZero(this->fDecNumber) && !ignoreNegativeZero &&
|
|
(fDecNumber->bits & DECNEG) != 0) {
|
|
// Negative Zero, not ingored. Cannot represent as a long.
|
|
return FALSE;
|
|
}
|
|
if (fDecNumber->digits + fDecNumber->exponent < 19) {
|
|
// The number is 18 or fewer digits.
|
|
// The max and min int64 are 19 digts, so this number fits.
|
|
// This is the common case.
|
|
return TRUE;
|
|
}
|
|
|
|
// TODO: Should cache these constants; construction is relatively costly.
|
|
// But not of huge consequence; they're only needed for 19 digit ints.
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
DigitList min64; min64.set("-9223372036854775808", status);
|
|
if (this->compare(min64) < 0) {
|
|
return FALSE;
|
|
}
|
|
DigitList max64; max64.set("9223372036854775807", status);
|
|
if (this->compare(max64) > 0) {
|
|
return FALSE;
|
|
}
|
|
if (U_FAILURE(status)) {
|
|
return FALSE;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
DigitList::set(int32_t source)
|
|
{
|
|
set((int64_t)source);
|
|
internalSetDouble(source);
|
|
}
|
|
|
|
// -------------------------------------
|
|
/**
|
|
* Set an int64, via decnumber
|
|
*/
|
|
void
|
|
DigitList::set(int64_t source)
|
|
{
|
|
char str[MAX_DIGITS+2]; // Leave room for sign and trailing nul.
|
|
formatBase10(source, str);
|
|
U_ASSERT(uprv_strlen(str) < sizeof(str));
|
|
|
|
uprv_decNumberFromString(fDecNumber, str, &fContext);
|
|
internalSetDouble(source);
|
|
}
|
|
|
|
/**
|
|
* Set an int64, with no decnumber
|
|
*/
|
|
void
|
|
DigitList::setInteger(int64_t source)
|
|
{
|
|
fDecNumber=NULL;
|
|
internalSetInt64(source);
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
/**
|
|
* Set the DigitList from a decimal number string.
|
|
*
|
|
* The incoming string _must_ be nul terminated, even though it is arriving
|
|
* as a StringPiece because that is what the decNumber library wants.
|
|
* We can get away with this for an internal function; it would not
|
|
* be acceptable for a public API.
|
|
*/
|
|
void
|
|
DigitList::set(const StringPiece &source, UErrorCode &status, uint32_t /*fastpathBits*/) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
if(fastpathBits==(kFastpathOk|kNoDecimal)) {
|
|
int32_t size = source.size();
|
|
const char *data = source.data();
|
|
int64_t r = 0;
|
|
int64_t m = 1;
|
|
// fast parse
|
|
while(size>0) {
|
|
char ch = data[--size];
|
|
if(ch=='+') {
|
|
break;
|
|
} else if(ch=='-') {
|
|
r = -r;
|
|
break;
|
|
} else {
|
|
int64_t d = ch-'0';
|
|
//printf("CH[%d]=%c, %d, *=%d\n", size,ch, (int)d, (int)m);
|
|
r+=(d)*m;
|
|
m *= 10;
|
|
}
|
|
}
|
|
//printf("R=%d\n", r);
|
|
set(r);
|
|
} else
|
|
#endif
|
|
{
|
|
// Figure out a max number of digits to use during the conversion, and
|
|
// resize the number up if necessary.
|
|
int32_t numDigits = source.length();
|
|
if (numDigits > fContext.digits) {
|
|
// fContext.digits == fStorage.getCapacity()
|
|
decNumber *t = fStorage.resize(numDigits, fStorage.getCapacity());
|
|
if (t == NULL) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
fDecNumber = t;
|
|
fContext.digits = numDigits;
|
|
}
|
|
|
|
fContext.status = 0;
|
|
uprv_decNumberFromString(fDecNumber, source.data(), &fContext);
|
|
if ((fContext.status & DEC_Conversion_syntax) != 0) {
|
|
status = U_DECIMAL_NUMBER_SYNTAX_ERROR;
|
|
}
|
|
}
|
|
internalClear();
|
|
}
|
|
|
|
/**
|
|
* Set the digit list to a representation of the given double value.
|
|
* This method supports both fixed-point and exponential notation.
|
|
* @param source Value to be converted.
|
|
*/
|
|
void
|
|
DigitList::set(double source)
|
|
{
|
|
// for now, simple implementation; later, do proper IEEE stuff
|
|
char rep[MAX_DIGITS + 8]; // Extra space for '+', '.', e+NNN, and '\0' (actually +8 is enough)
|
|
|
|
// Generate a representation of the form /[+-][0-9].[0-9]+e[+-][0-9]+/
|
|
// Can also generate /[+-]nan/ or /[+-]inf/
|
|
// TODO: Use something other than sprintf() here, since it's behavior is somewhat platform specific.
|
|
// That is why infinity is special cased here.
|
|
if (uprv_isInfinite(source)) {
|
|
if (uprv_isNegativeInfinity(source)) {
|
|
uprv_strcpy(rep,"-inf"); // Handle negative infinity
|
|
} else {
|
|
uprv_strcpy(rep,"inf");
|
|
}
|
|
} else {
|
|
sprintf(rep, "%+1.*e", MAX_DBL_DIGITS - 1, source);
|
|
}
|
|
U_ASSERT(uprv_strlen(rep) < sizeof(rep));
|
|
|
|
// uprv_decNumberFromString() will parse the string expecting '.' as a
|
|
// decimal separator, however sprintf() can use ',' in certain locales.
|
|
// Overwrite a ',' with '.' here before proceeding.
|
|
char *decimalSeparator = strchr(rep, ',');
|
|
if (decimalSeparator != NULL) {
|
|
*decimalSeparator = '.';
|
|
}
|
|
|
|
// Create a decNumber from the string.
|
|
uprv_decNumberFromString(fDecNumber, rep, &fContext);
|
|
uprv_decNumberTrim(fDecNumber);
|
|
internalSetDouble(source);
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/*
|
|
* Multiply
|
|
* The number will be expanded if need be to retain full precision.
|
|
* In practice, for formatting, multiply is by 10, 100 or 1000, so more digits
|
|
* will not be required for this use.
|
|
*/
|
|
void
|
|
DigitList::mult(const DigitList &other, UErrorCode &status) {
|
|
fContext.status = 0;
|
|
int32_t requiredDigits = this->digits() + other.digits();
|
|
if (requiredDigits > fContext.digits) {
|
|
reduce(); // Remove any trailing zeros
|
|
int32_t requiredDigits = this->digits() + other.digits();
|
|
ensureCapacity(requiredDigits, status);
|
|
}
|
|
uprv_decNumberMultiply(fDecNumber, fDecNumber, other.fDecNumber, &fContext);
|
|
internalClear();
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/*
|
|
* Divide
|
|
* The number will _not_ be expanded for inexact results.
|
|
* TODO: probably should expand some, for rounding increments that
|
|
* could add a few digits, e.g. .25, but not expand arbitrarily.
|
|
*/
|
|
void
|
|
DigitList::div(const DigitList &other, UErrorCode &status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
uprv_decNumberDivide(fDecNumber, fDecNumber, other.fDecNumber, &fContext);
|
|
internalClear();
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/*
|
|
* ensureCapacity. Grow the digit storage for the number if it's less than the requested
|
|
* amount. Never reduce it. Available size is kept in fContext.digits.
|
|
*/
|
|
void
|
|
DigitList::ensureCapacity(int32_t requestedCapacity, UErrorCode &status) {
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
if (requestedCapacity <= 0) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (requestedCapacity > DEC_MAX_DIGITS) {
|
|
// Don't report an error for requesting too much.
|
|
// Arithemetic Results will be rounded to what can be supported.
|
|
// At 999,999,999 max digits, exceeding the limit is not too likely!
|
|
requestedCapacity = DEC_MAX_DIGITS;
|
|
}
|
|
if (requestedCapacity > fContext.digits) {
|
|
decNumber *newBuffer = fStorage.resize(requestedCapacity, fStorage.getCapacity());
|
|
if (newBuffer == NULL) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
fContext.digits = requestedCapacity;
|
|
fDecNumber = newBuffer;
|
|
}
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* Round the representation to the given number of digits.
|
|
* @param maximumDigits The maximum number of digits to be shown.
|
|
* Upon return, count will be less than or equal to maximumDigits.
|
|
*/
|
|
void
|
|
DigitList::round(int32_t maximumDigits)
|
|
{
|
|
int32_t savedDigits = fContext.digits;
|
|
fContext.digits = maximumDigits;
|
|
uprv_decNumberPlus(fDecNumber, fDecNumber, &fContext);
|
|
fContext.digits = savedDigits;
|
|
uprv_decNumberTrim(fDecNumber);
|
|
internalClear();
|
|
}
|
|
|
|
|
|
void
|
|
DigitList::roundFixedPoint(int32_t maximumFractionDigits) {
|
|
trim(); // Remove trailing zeros.
|
|
if (fDecNumber->exponent >= -maximumFractionDigits) {
|
|
return;
|
|
}
|
|
decNumber scale; // Dummy decimal number, but with the desired number of
|
|
uprv_decNumberZero(&scale); // fraction digits.
|
|
scale.exponent = -maximumFractionDigits;
|
|
scale.lsu[0] = 1;
|
|
|
|
uprv_decNumberQuantize(fDecNumber, fDecNumber, &scale, &fContext);
|
|
trim();
|
|
internalClear();
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
DigitList::toIntegralValue() {
|
|
uprv_decNumberToIntegralValue(fDecNumber, fDecNumber, &fContext);
|
|
}
|
|
|
|
|
|
// -------------------------------------
|
|
UBool
|
|
DigitList::isZero() const
|
|
{
|
|
return decNumberIsZero(fDecNumber);
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
#endif // #if !UCONFIG_NO_FORMATTING
|
|
|
|
//eof
|