845 lines
16 KiB
C++
845 lines
16 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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#include <stdarg.h>
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#include "String.h"
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extern char* itoa(int value, char* string, int radix);
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extern char* ltoa(Int64 value, char* string, int radix);
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extern char* utoa(uint value, char* string, int radix);
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extern char* ultoa(UInt64 value, char* string, int radix);
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char* dtostrf(double val, char width, byte prec, char* sout);
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/******************************** String ********************************/
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String::String(const char* cstr)
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{
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init();
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/*
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其实这里可以不用拷贝，内部直接使用这个指针，等第一次修改的时候再拷贝，不过那样过于复杂了
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*/
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if (cstr) copy(cstr, strlen(cstr));
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}
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String::String(const String& value)
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{
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init();
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*this = value;
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}
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String::String(String&& rval)
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{
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init();
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move(rval);
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}
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String::String(StringHelper&& rval)
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{
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init();
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move(rval);
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}
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String::String(char c)
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{
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init();
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/*char buf[2];
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buf[0] = c;
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buf[1] = 0;
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*this = buf;*/
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_Arr[0] = c;
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_Arr[1] = 0;
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}
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String::String(byte value, byte radix)
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{
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init();
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utoa(value, _Arr, radix);
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}
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String::String(int value, byte radix)
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{
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init();
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itoa(value, _Arr, radix);
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}
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String::String(uint value, byte radix)
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{
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init();
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utoa(value, _Arr, radix);
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}
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String::String(Int64 value, byte radix)
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{
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init();
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ltoa(value, _Arr, radix);
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}
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String::String(UInt64 value, byte radix)
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{
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init();
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ultoa(value, _Arr, radix);
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}
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String::String(float value, byte decimalPlaces)
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{
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init();
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dtostrf(value, (decimalPlaces + 2), decimalPlaces, _Arr);
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}
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String::String(double value, byte decimalPlaces)
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{
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init();
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dtostrf(value, (decimalPlaces + 2), decimalPlaces, _Arr);
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}
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// 外部传入缓冲区供内部使用，注意长度减去零结束符
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String::String(char* str, int length)
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{
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init();
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_Arr = str;
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_Capacity = length - 1;
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_Arr[0] = 0;
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}
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String::~String()
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{
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if(_needFree && _Arr != Arr) delete _Arr;
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}
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inline void String::init()
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{
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_Arr = Arr;
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_Capacity = sizeof(Arr) - 1;
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_Length = 0;
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_needFree = false;
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//_canWrite = true;
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}
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void String::release()
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{
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if(_needFree && _Arr != Arr) delete _Arr;
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init();
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}
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bool String::CheckCapacity(uint size)
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{
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if (_Arr && _Capacity >= size) return true;
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// 外部需要放下size个字符，那么需要size+1个字节空间
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int sz = _Capacity;
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while(sz <= size) sz <<= 1;
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auto p = new char[sz];
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if(!p) return false;
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if(_Length)
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strcpy(p, _Arr);
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else
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p[0] = 0;
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if(_needFree && _Arr != Arr) delete _Arr;
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_Arr = p;
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_Capacity = sz;
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_needFree = true;
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return true;
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}
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String& String::copy(const char* cstr, uint length)
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{
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if (!CheckCapacity(length))
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release();
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else
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{
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_Length = length;
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strcpy(_Arr, cstr);
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}
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return *this;
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}
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void String::move(String& rhs)
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{
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if (_Arr) {
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if (_Capacity >= rhs._Length) {
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strcpy(_Arr, rhs._Arr);
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_Length = rhs._Length;
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rhs._Length = 0;
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return;
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} else {
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delete _Arr;
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}
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}
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_Arr = rhs._Arr;
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_Capacity = rhs._Capacity;
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_Length = rhs._Length;
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rhs._Arr = NULL;
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rhs._Capacity = 0;
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rhs._Length = 0;
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}
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void String::SetBuffer(const void* str, int length)
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{
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_Arr = (char*)str;
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_Capacity = length;
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_Length = 0;
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}
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String& String::operator = (const String& rhs)
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{
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if (this == &rhs) return *this;
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if (rhs._Arr) copy(rhs._Arr, rhs._Length);
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else release();
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return *this;
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}
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String& String::operator = (String&& rval)
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{
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if (this != &rval) move(rval);
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return *this;
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}
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String& String::operator = (StringHelper&& rval)
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{
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if (this != &rval) move(rval);
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return *this;
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}
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String& String::operator = (const char* cstr)
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{
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if (cstr) copy(cstr, strlen(cstr));
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else release();
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return *this;
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}
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bool String::Concat(const Object& obj)
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{
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return Concat(obj.ToString());
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}
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bool String::Concat(const String& s)
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{
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return Concat(s._Arr, s._Length);
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}
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bool String::Concat(const char* cstr, uint length)
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{
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uint newlen = _Length + length;
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if (!cstr) return false;
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if (length == 0) return true;
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if (!CheckCapacity(newlen)) return false;
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strcpy(_Arr + _Length, cstr);
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_Length = newlen;
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return true;
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}
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bool String::Concat(const char* cstr)
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{
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if (!cstr) return 0;
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return Concat(cstr, strlen(cstr));
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}
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bool String::Concat(char c)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = 0;
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return Concat(buf, 1);
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}
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bool String::Concat(byte num, byte radix)
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{
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char buf[1 + 3 * sizeof(byte)];
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itoa(num, buf, radix);
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return Concat(buf, strlen(buf));
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}
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bool String::Concat(int num, byte radix)
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{
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char buf[2 + 3 * sizeof(int)];
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itoa(num, buf, radix);
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return Concat(buf, strlen(buf));
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}
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/*bool String::Concat(uint num, byte radix, byte width)
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{
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char buf[2 + 3 * sizeof(int)];
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itoa(num, buf, radix);
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int length = strlen(buf);
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if(width)
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{
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int remain = width - length;
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if(remain > 0)
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{
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// 前面补0
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char cs[16];
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memset(cs, '0', remain);
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cs[remain] = 0;
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Concat(cs, remain);
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}
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// 如果超长，按照C#标准，让它撑大
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}
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return Concat(buf, length);
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}*/
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bool String::Concat(uint num, byte radix)
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{
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char buf[1 + 3 * sizeof(uint)];
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utoa(num, buf, radix);
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return Concat(buf, strlen(buf));
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}
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bool String::Concat(Int64 num, byte radix)
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{
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char buf[2 + 3 * sizeof(Int64)];
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ltoa(num, buf, radix);
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return Concat(buf, strlen(buf));
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}
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bool String::Concat(UInt64 num, byte radix)
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{
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char buf[1 + 3 * sizeof(UInt64)];
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ultoa(num, buf, radix);
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return Concat(buf, strlen(buf));
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}
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bool String::Concat(float num)
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{
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char buf[20];
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char* string = dtostrf(num, 4, 2, buf);
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return Concat(string, strlen(string));
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}
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bool String::Concat(double num)
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{
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char buf[20];
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char* string = dtostrf(num, 4, 2, buf);
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return Concat(string, strlen(string));
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}
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StringHelper& operator + (const StringHelper& lhs, const Object& rhs)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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auto str = rhs.ToString();
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if (!a.Concat(str._Arr, str._Length)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, const String& rhs)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(rhs._Arr, rhs._Length)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, const char* cstr)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!cstr || !a.Concat(cstr, strlen(cstr))) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, char c)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(c)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, byte num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, int num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, uint num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, Int64 num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, UInt64 num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, float num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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StringHelper& operator + (const StringHelper& lhs, double num)
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{
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auto& a = const_cast<StringHelper&>(lhs);
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if (!a.Concat(num)) a.release();
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return a;
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}
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int String::CompareTo(const String& s) const
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{
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if (!_Arr || !s._Arr) {
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if (s._Arr && s._Length > 0) return 0 - *(byte*)s._Arr;
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if (_Arr && _Length > 0) return *(byte*)_Arr;
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return 0;
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}
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return strcmp(_Arr, s._Arr);
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}
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bool String::Equals(const String& s2) const
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{
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return _Length == s2._Length && CompareTo(s2) == 0;
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}
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bool String::Equals(const char* cstr) const
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{
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if (_Length == 0) return cstr == NULL || *cstr == 0;
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if (cstr == NULL) return _Arr[0] == 0;
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return strcmp(_Arr, cstr) == 0;
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}
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bool String::EqualsIgnoreCase(const String &s2 ) const
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{
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if (this == &s2) return true;
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if (_Length != s2._Length) return false;
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if (_Length == 0) return true;
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const char *p1 = _Arr;
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const char *p2 = s2._Arr;
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while (*p1) {
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if (tolower(*p1++) != tolower(*p2++)) return false;
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}
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return true;
|
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}
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||
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bool String::operator<(const String& rhs) const
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{
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return CompareTo(rhs) < 0;
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||
}
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||
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bool String::operator>(const String& rhs) const
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||
{
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return CompareTo(rhs) > 0;
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||
}
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||
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bool String::operator<=(const String& rhs) const
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{
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return CompareTo(rhs) <= 0;
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}
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||
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bool String::operator>=(const String& rhs) const
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{
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return CompareTo(rhs) >= 0;
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}
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||
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void String::SetAt(int loc, char c)
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{
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if (loc < _Length) _Arr[loc] = c;
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}
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||
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char& String::operator[](int index)
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{
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||
static char dummy_writable_char;
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||
if (index >= _Length || !_Arr) {
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||
dummy_writable_char = 0;
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||
return dummy_writable_char;
|
||
}
|
||
return _Arr[index];
|
||
}
|
||
|
||
char String::operator[](int index) const
|
||
{
|
||
if (index >= _Length || !_Arr) return 0;
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||
return _Arr[index];
|
||
}
|
||
|
||
void String::GetBytes(byte* buf, int bufsize, int index) const
|
||
{
|
||
if (!bufsize || !buf) return;
|
||
if (index >= _Length) {
|
||
buf[0] = 0;
|
||
return;
|
||
}
|
||
int n = bufsize - 1;
|
||
if (n > _Length - index) n = _Length - index;
|
||
strncpy((char*)buf, _Arr + index, n);
|
||
buf[n] = 0;
|
||
}
|
||
|
||
ByteArray String::GetBytes() const
|
||
{
|
||
ByteArray bs;
|
||
bs.SetLength(_Length);
|
||
|
||
GetBytes(bs.GetBuffer(), bs.Length());
|
||
|
||
return bs;
|
||
}
|
||
|
||
ByteArray String::ToHex() const
|
||
{
|
||
ByteArray bs;
|
||
bs.SetLength(_Length / 2);
|
||
|
||
char cs[3];
|
||
cs[2] = 0;
|
||
byte* b = bs.GetBuffer();
|
||
char* p = _Arr;
|
||
for(int i=0; i<_Length; i+=2)
|
||
{
|
||
cs[0] = *p++;
|
||
cs[1] = *p++;
|
||
|
||
*b++ = (byte)strtol(cs, nullptr, 16);
|
||
}
|
||
|
||
return bs;
|
||
}
|
||
|
||
// 输出对象的字符串表示方式
|
||
String& String::ToStr(String& str) const
|
||
{
|
||
// 把当前字符串复制到目标字符串后面
|
||
//str.Copy(*this, str._Length);
|
||
str += *this;
|
||
|
||
return (String&)*this;
|
||
}
|
||
|
||
// 输出对象的字符串表示方式
|
||
String String::ToString() const
|
||
{
|
||
return *this;
|
||
}
|
||
|
||
// 清空已存储数据。
|
||
void String::Clear()
|
||
{
|
||
release();
|
||
}
|
||
|
||
// 调试输出字符串
|
||
void String::Show(bool newLine) const
|
||
{
|
||
if(_Length) debug_printf("%s", _Arr);
|
||
if(newLine) debug_printf("\r\n");
|
||
}
|
||
|
||
// 格式化字符串，输出到现有字符串后面。方便我们连续格式化多个字符串
|
||
String& String::Format(const char* format, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start(ap, format);
|
||
|
||
// 无法准确估计长度，大概乘以2处理
|
||
CheckCapacity(_Length + (strlen(format) << 1));
|
||
|
||
//char* p = _Arr;
|
||
int len2 = vsnprintf(_Arr + _Length, _Capacity - _Length, format, ap);
|
||
_Length += len2;
|
||
|
||
va_end(ap);
|
||
|
||
return *this;
|
||
}
|
||
|
||
int String::IndexOf(const char ch, int startIndex) const
|
||
{
|
||
if(startIndex >= _Length) return -1;
|
||
|
||
auto p = strchr(_Arr + startIndex, ch);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
int String::IndexOf(const String& str, int startIndex) const
|
||
{
|
||
if(str._Length == 0) return -1;
|
||
if(startIndex + str._Length > _Length) return -1;
|
||
|
||
auto p = strstr(_Arr + startIndex, str._Arr);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
int String::IndexOf(const char* str, int startIndex) const
|
||
{
|
||
if(!str) return -1;
|
||
if(startIndex + strlen(str) > _Length) return -1;
|
||
|
||
auto p = strstr(_Arr + startIndex, str);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
int String::LastIndexOf(const char ch, int startIndex) const
|
||
{
|
||
if(startIndex >= _Length) return -1;
|
||
|
||
auto p = strrchr(_Arr + startIndex, ch);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
char *strrstr(const char* s, const char* str)
|
||
{
|
||
char *p;
|
||
int _Length = strlen(s);
|
||
for (p = (char*)s + _Length - 1; p >= s; p--) {
|
||
if ((*p == *str) && (memcmp(p, str, strlen(str)) == 0))
|
||
return p;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
int String::LastIndexOf(const String& str, int startIndex) const
|
||
{
|
||
if(str._Length == 0) return -1;
|
||
if(startIndex + str._Length > _Length) return -1;
|
||
|
||
auto p = strrstr(_Arr + startIndex, str._Arr);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
int String::LastIndexOf(const char* str, int startIndex) const
|
||
{
|
||
if(!str) return -1;
|
||
if(startIndex + strlen(str) > _Length) return -1;
|
||
|
||
auto p = strrstr(_Arr + startIndex, str);
|
||
if(!p) return -1;
|
||
|
||
return p - _Arr;
|
||
}
|
||
|
||
bool String::StartsWith(const String& str, int startIndex) const
|
||
{
|
||
if (startIndex + str._Length > _Length || !_Arr || !str._Arr) return false;
|
||
return strncmp(&_Arr[startIndex], str._Arr, str._Length) == 0;
|
||
}
|
||
|
||
bool String::StartsWith(const char* str, int startIndex) const
|
||
{
|
||
if(!str) return false;
|
||
int slen = strlen(str);
|
||
if (startIndex + slen > _Length || !_Arr) return false;
|
||
return strncmp(&_Arr[startIndex], str, slen) == 0;
|
||
}
|
||
|
||
bool String::EndsWith(const String& str) const
|
||
{
|
||
if(str._Length == 0) return false;
|
||
if(str._Length > _Length) return false;
|
||
|
||
return strncmp(&_Arr[_Length - str._Length], str._Arr, str._Length) == 0;
|
||
}
|
||
|
||
bool String::EndsWith(const char* str) const
|
||
{
|
||
if(!str) return false;
|
||
int slen = strlen(str);
|
||
if(slen > _Length) return false;
|
||
|
||
return strncmp(&_Arr[_Length - slen], str, slen) == 0;
|
||
}
|
||
|
||
int String::Split(const String& str, StringItem callback)
|
||
{
|
||
if(str.Length() == 0) return 0;
|
||
|
||
int n = 0;
|
||
int p = 0;
|
||
int e = 0;
|
||
while(p < _Length)
|
||
{
|
||
// 找到下一个位置。如果找不到，直接移到末尾
|
||
e = IndexOf(str, p);
|
||
if(e < 0) e = _Length;
|
||
|
||
n++;
|
||
|
||
auto item = Substring(p, e - p);
|
||
callback(item);
|
||
|
||
// 如果在末尾，说明没有找到
|
||
if(e == _Length) break;
|
||
|
||
p = e + str.Length();
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
String String::Substring(int start, int length) const
|
||
{
|
||
String str;
|
||
//str.Copy(this, _Length, start);
|
||
if(_Length && start < _Length) str.copy(_Arr + start, length);
|
||
|
||
return str;
|
||
}
|
||
|
||
void trim(char* buffer, int& len, bool trimBegin, bool trimEnd)
|
||
{
|
||
if (!buffer || len == 0) return;
|
||
char *begin = buffer;
|
||
if(trimBegin) while (isspace(*begin)) begin++;
|
||
char *end = buffer + len - 1;
|
||
if(trimEnd) while (isspace(*end) && end >= begin) end--;
|
||
len = end + 1 - begin;
|
||
if (begin > buffer) memcpy(buffer, begin, len);
|
||
buffer[len] = 0;
|
||
}
|
||
|
||
String& String::TrimStart()
|
||
{
|
||
trim(_Arr, _Length, true, false);
|
||
|
||
return *this;
|
||
}
|
||
|
||
String& String::TrimEnd()
|
||
{
|
||
trim(_Arr, _Length, false, true);
|
||
|
||
return *this;
|
||
}
|
||
|
||
String& String::Trim()
|
||
{
|
||
trim(_Arr, _Length, true, true);
|
||
|
||
return *this;
|
||
}
|
||
|
||
extern char* itoa(int value, char *string, int radix)
|
||
{
|
||
return ltoa(value, string, radix) ;
|
||
}
|
||
|
||
extern char* ltoa(Int64 value, char* string, int radix )
|
||
{
|
||
char tmp[33];
|
||
char *tp = tmp;
|
||
Int64 i;
|
||
UInt64 v;
|
||
int sign;
|
||
char *sp;
|
||
|
||
if ( string == NULL ) return 0 ;
|
||
|
||
if (radix > 36 || radix <= 1) return 0 ;
|
||
|
||
sign = (radix == 10 && value < 0);
|
||
if (sign)
|
||
v = -value;
|
||
else
|
||
v = (UInt64)value;
|
||
|
||
while (v || tp == tmp)
|
||
{
|
||
i = v % radix;
|
||
v = v / radix;
|
||
if (i < 10)
|
||
*tp++ = i+'0';
|
||
else
|
||
*tp++ = i + 'a' - 10;
|
||
}
|
||
|
||
sp = string;
|
||
|
||
if (sign) *sp++ = '-';
|
||
while (tp > tmp)
|
||
*sp++ = *--tp;
|
||
*sp = 0;
|
||
|
||
return string;
|
||
}
|
||
|
||
extern char* utoa(uint value, char* string, int radix)
|
||
{
|
||
return ultoa(value, string, radix ) ;
|
||
}
|
||
|
||
extern char* ultoa(UInt64 value, char* string, int radix)
|
||
{
|
||
char tmp[33];
|
||
char *tp = tmp;
|
||
Int64 i;
|
||
UInt64 v = value;
|
||
char *sp;
|
||
|
||
if ( string == NULL ) return 0;
|
||
|
||
if (radix > 36 || radix <= 1) return 0;
|
||
|
||
while (v || tp == tmp)
|
||
{
|
||
i = v % radix;
|
||
v = v / radix;
|
||
if (i < 10)
|
||
*tp++ = i+'0';
|
||
else
|
||
*tp++ = i + 'a' - 10;
|
||
}
|
||
|
||
sp = string;
|
||
|
||
while (tp > tmp)
|
||
*sp++ = *--tp;
|
||
*sp = 0;
|
||
|
||
return string;
|
||
}
|
||
|
||
char *dtostrf (double val, char width, byte prec, char* sout)
|
||
{
|
||
char fmt[20];
|
||
sprintf(fmt, "%%%d.%df", width, prec);
|
||
sprintf(sout, fmt, val);
|
||
return sout;
|
||
}
|