diff options
Diffstat (limited to 'libs/libjson/src/NumberToString.h')
| -rw-r--r-- | libs/libjson/src/NumberToString.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/libs/libjson/src/NumberToString.h b/libs/libjson/src/NumberToString.h new file mode 100644 index 0000000000..a706372f92 --- /dev/null +++ b/libs/libjson/src/NumberToString.h @@ -0,0 +1,104 @@ +#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
+ mir_snwprintf(result, 63, L"%f", value);
+ #else
+ mir_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 double & one, const double & two){
+ const double temp = one - two;
+ return (temp > 0.0) ? temp < 0.00001 : temp > -0.00001;
+ }
+};
+
+#endif
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