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#ifndef NUMBERTOSTRING_H
#define NUMBERTOSTRING_H
#include "JSONDebug.h"
#include "JSONMemory.h"
#include <cstdio>
static unsigned int getlen(unsigned int size){
switch (size){
case 1:
return 5; //3 digits for the number, plus null terminator and negation
case 2:
return 7; //5 digits for the number, plus null terminator and negation
case 4:
return 12; //10 digits for the number, plus null terminator and negation
case 8:
return 22; //20 digits for the number, plus null terminator and negation
}
JSON_ASSERT(size == 16, JSON_TEXT("template is not recognized 2^x in size"));
return 41; //39 digits for the number, plus null terminator and negation
}
class NumberToString {
public:
template<typename T>
static json_string _itoa(T val, unsigned int size){
long value = (long)val;
const unsigned int digits = getlen(size);
json_auto<json_char> result(digits);
result.ptr[digits - 1] = JSON_TEXT('\0'); //null terminator
json_char * runner = &result.ptr[digits - 2];
bool negative;
//first thing, check if it's negative, if so, make it positive
if (value < 0){
value = -value;
negative = true;
} else {
negative = false;
}
//create the string
do {
*runner-- = (json_char)(value % 10) + JSON_TEXT('0');
} while(value /= 10);
//if it's negative, add the negation
json_string res;
if (negative){
*runner = JSON_TEXT('-');
res = runner;
} else {
res = runner + 1;
}
return res;
}
#ifndef JSON_LIBRARY
template<typename T>
static json_string _uitoa(T val, unsigned int size){
unsigned long value = val;
const unsigned int digits = getlen(size) - 1; //minus one because no '-' char
json_auto<json_char> result(digits);
result.ptr[digits - 1] = JSON_TEXT('\0'); //null terminator
json_char * runner = &result.ptr[digits - 2];
//create the string
do {
*runner-- = (json_char)(value % 10) + JSON_TEXT('0');
} while(value /= 10);
json_string res = runner + 1;
return res;
}
#endif
template<typename T>
static json_string _ftoa(T value){
json_char result[64];
#ifdef JSON_UNICODE
swprintf(result, 63, L"%f", value);
#else
snprintf(result, 63, "%f", value);
#endif
//strip the trailing zeros
for(json_char * pos = &result[0]; *pos; ++pos){
if (*pos == '.') { //only care about after the decimal
for(json_char * runner = pos + 1; *runner; ++runner){
if (*runner != JSON_TEXT('0')) pos = runner + 1;
}
*pos = JSON_TEXT('\0');
break;
}
}
return result;
}
static inline bool areEqual(const json_number & one, const json_number & two){
const json_number temp = one - two;
return (temp > 0.0) ? temp < 0.00001 : temp > -0.00001;
}
};
#endif
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