godot/core/ustring.cpp

/*************************************************************************/
/*  ustring.cpp                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include <wchar.h>
#include "ustring.h"
#include "os/memory.h"
#include "print_string.h"
#include "math_funcs.h"
#include "io/md5.h"
#include "io/sha256.h"
#include "ucaps.h"
#include "color.h"
#include "variant.h"
#define MAX_DIGITS 6
#define UPPERCASE(m_c) (((m_c)>='a' && (m_c)<='z')?((m_c)-('a'-'A')):(m_c))
#define LOWERCASE(m_c) (((m_c)>='A' && (m_c)<='Z')?((m_c)+('a'-'A')):(m_c))


#ifndef NO_USE_STDLIB
#include <stdlib.h>
#include <stdio.h>
#endif

#if defined(MINGW_ENABLED) || defined(_MSC_VER)
#define snprintf _snprintf
#endif

/** STRING **/

const char *CharString::get_data() const {

	if (size())
		return &operator[](0);
	else
		return "";
}

void String::copy_from(const char *p_cstr) {

	int len=0;
	const char *ptr=p_cstr;
	while (*(ptr++)!=0)
		len++;

	if (len==0) {

		resize(0);
		return;
	}


	resize(len+1); // include 0

	CharType *dst = this->ptr();

	for (int i=0;i<len+1;i++) {

		dst[i]=p_cstr[i];
	}

}

void String::copy_from(const CharType* p_cstr, int p_clip_to) {

	int len=0;
	const CharType *ptr=p_cstr;
	while (*(ptr++)!=0)
		len++;

	if (p_clip_to>=0 && len>p_clip_to)
		len=p_clip_to;

	if (len==0) {

		resize(0);
		return;
	}

	resize(len+1);
	set(len,0);

	CharType *dst = &operator[](0);


	for (int i=0;i<len;i++) {

		dst[i]=p_cstr[i];
	}
}

void String::copy_from(const CharType& p_char) {

	resize(2);
	set(0,p_char);
	set(1,0);
}


bool String::operator==(const String& p_str) const {

	if (length()!=p_str.length())
		return false;
	if (empty())
		return true;

	int l=length();

	const CharType *src = c_str();
	const CharType *dst = p_str.c_str();

	/* Compare char by char */
	for (int i=0;i<l;i++) {

		if (src[i]!=dst[i])
			return false;
	}

	return true;
}

bool String::operator!=(const String& p_str) const {

	return !(*this==p_str);
}



String String::operator+(const String& p_str)  const {

	String res=*this;
	res+=p_str;
	return res;
}

/*
String String::operator+(CharType p_chr)  const {

	String res=*this;
	res+=p_chr;
	return res;
}
*/
String& String::operator+=(const String &p_str) {

	if (empty()) {
		*this=p_str;
		return *this;
	}

	if (p_str.empty())
		return *this;

	int from=length();

	resize( length() + p_str.size() );

	const CharType *src = p_str.c_str();
	CharType *dst = &operator[](0);

	set( length(), 0 );

	for (int i=0;i<p_str.length();i++)
		dst[from+i]=src[i];

	return *this;

}

String& String::operator+=(const CharType *p_str) {


	*this+=String(p_str);
	return *this;
}


String&  String::operator+=(CharType p_char) {


	resize( size() ? size() + 1 : 2);
	set( length(), 0 );
	set( length() -1, p_char );

	return *this;

}

String& String::operator+=(const char * p_str) {

	if (!p_str || p_str[0]==0)
		return *this;

	int src_len=0;
	const char *ptr=p_str;
	while (*(ptr++)!=0)
		src_len++;

	int from=length();

	resize( from + src_len + 1 );

	CharType *dst = &operator[](0);

	set( length(), 0 );

	for (int i=0;i<src_len;i++)
		dst[from+i]=p_str[i];

	return *this;

}

void String::operator=(const char *p_str) {

	copy_from(p_str);

}

void String::operator=(const CharType *p_str) {

	copy_from(p_str);

}

bool String::operator==(const StrRange &p_range) const {

	int len=p_range.len;

	if (length()!=len)
		return false;
	if (empty())
		return true;

	const CharType *c_str=p_range.c_str;
	const CharType *dst = &operator[](0);

	/* Compare char by char */
	for (int i=0;i<len;i++) {

		if (c_str[i]!=dst[i])
			return false;
	}

	return true;
}

bool String::operator==(const char *p_str) const {

	int len=0;
	const char *aux=p_str;

	while (*(aux++)!=0)
		len++;

	if (length()!=len)
		return false;
	if (empty())
		return true;

	int l=length();

	const CharType *dst = c_str();

	/* Compare char by char */
	for (int i=0;i<l;i++) {

		if (p_str[i]!=dst[i])
			return false;
	}

	return true;


}

bool String::operator==(const CharType *p_str) const {

	int len=0;
	const CharType *aux=p_str;

	while (*(aux++)!=0)
		len++;

	if (length()!=len)
		return false;
	if (empty())
		return true;

	int l=length();

	const CharType *dst = c_str();

	/* Compare char by char */
	for (int i=0;i<l;i++) {

		if (p_str[i]!=dst[i])
			return false;
	}

	return true;

}

bool String::operator!=(const char *p_str) const {

	return (! ( *this==p_str ) );
}


bool String::operator!=(const CharType *p_str) const {

	return (! ( *this==p_str ) );

}

bool String::operator<(const CharType *p_str) const {


	if (empty() && p_str[0]==0)
		return false;
	if (empty())
		return true;


	const CharType *this_str=c_str();
	while (true) {

		if (*p_str==0 && *this_str==0)
			return false; //this can't be equal, sadly
		else if (*this_str==0)
			return true; //if this is empty, and the other one is not, then we're less.. I think?
		else if (*p_str==0)
			return false; //otherwise the other one is smaller..
		else if (*this_str < *p_str ) //more than
			return true;
		else if (*this_str > *p_str ) //less than
			return false;

		this_str++;
		p_str++;
	}

	return false; //should never reach here anyway

}

bool String::operator<=(String p_str) const {

	return (*this<p_str) || (*this==p_str);
}

bool String::operator<(const char *p_str) const {

	if (empty() && p_str[0]==0)
		return false;
	if (empty())
		return true;

	const CharType *this_str=c_str();
	while (true) {

		if (*p_str==0 && *this_str==0)
			return false; //this can't be equal, sadly
		else if (*this_str==0)
			return true; //if this is empty, and the other one is not, then we're less.. I think?
		else if (*p_str==0)
			return false; //otherwise the other one is smaller..
		else if (*this_str < *p_str ) //more than
			return true;
		else if (*this_str > *p_str ) //less than
			return false;

		this_str++;
		p_str++;
	}

	return false; //should never reach here anyway

}



bool String::operator<(String p_str) const {

	return operator<(p_str.c_str());
}

signed char String::nocasecmp_to(const String &p_str) const {

	if (empty() && p_str.empty())
		return 0;
	if (empty())
		return -1;
	if (p_str.empty())
		return 1;

	const CharType *that_str=p_str.c_str();
	const CharType *this_str=c_str();

	while (true) {

		if (*that_str==0 && *this_str==0)
			return 0; //we're equal
		else if (*this_str==0)
			return -1; //if this is empty, and the other one is not, then we're less.. I think?
		else if (*that_str==0)
			return 1; //otherwise the other one is smaller..
		else if (_find_upper(*this_str) < _find_upper(*that_str) ) //more than
			return -1;
		else if (_find_upper(*this_str) > _find_upper(*that_str) ) //less than
			return 1;

		this_str++;
		that_str++;
	}

	return 0; //should never reach anyway

}

signed char String::casecmp_to(const String &p_str) const {

	if (empty() && p_str.empty())
		return 0;
	if (empty())
		return -1;
	if (p_str.empty())
		return 1;

	const CharType *that_str=p_str.c_str();
	const CharType *this_str=c_str();

	while (true) {

		if (*that_str==0 && *this_str==0)
			return 0; //we're equal
		else if (*this_str==0)
			return -1; //if this is empty, and the other one is not, then we're less.. I think?
		else if (*that_str==0)
			return 1; //otherwise the other one is smaller..
		else if (*this_str < *that_str ) //more than
			return -1;
		else if (*this_str > *that_str ) //less than
			return 1;

		this_str++;
		that_str++;
	}

	return 0; //should never reach anyway

}

void String::erase(int p_pos, int p_chars) {


	*this=left(p_pos)+substr( p_pos + p_chars , length() - ( (p_pos+p_chars) ) );


}



String String::capitalize() const {

	String aux=this->replace("_"," ").to_lower();
	String cap;
	for (int i=0;i<aux.get_slice_count(" ");i++) {

		String slice=aux.get_slicec(' ',i);
		if (slice.length()>0) {

			slice[0]=_find_upper(slice[0]);
			if (i>0)
				cap+=" ";
			cap+=slice;
		}
	}

	return cap;
}

String String::camelcase_to_underscore(bool lowercase) const {
	const CharType * cstr = c_str();
	String new_string;
	const char A = 'A', Z = 'Z';
	const char a = 'a', z = 'z';
	int start_index = 0;

	for ( size_t i = 1; i < this->size(); i++ ) {
		bool is_upper = cstr[i] >= A && cstr[i] <= Z;
		bool are_next_2_lower = false;
		bool was_precedent_upper = cstr[i-1] >= A && cstr[i-1] <= Z;

		if (i+2 < this->size()) {
			are_next_2_lower = cstr[i+1] >= a && cstr[i+1] <= z && cstr[i+2] >= a && cstr[i+2] <= z;
		}

		bool should_split = ((is_upper && !was_precedent_upper) || (was_precedent_upper && is_upper && are_next_2_lower));
		if (should_split) {
			new_string += this->substr(start_index, i - start_index) + "_";
			start_index = i;
		}
	}

	new_string += this->substr(start_index, this->size() - start_index);
	return lowercase ? new_string.to_lower() : new_string;
}



int String::get_slice_count(String p_splitter) const{

	if (empty())
		return 0;
	if (p_splitter.empty())
		return 0;

	int pos=0;
	int slices=1;

	while ( (pos=find(p_splitter,pos))>=0) {

		slices++;
		pos+=p_splitter.length();
	}

	return slices;
}

String String::get_slice(String p_splitter, int p_slice) const {

	if (empty() || p_splitter.empty())
		return "";

	int pos=0;
	int prev_pos=0;
//	int slices=1;
	if (p_slice<0)
		return "";
	if (find(p_splitter)==-1)
		return *this;

	int i=0;
	while(true) {

		pos=find(p_splitter,pos);
		if (pos==-1)
			pos=length(); //reached end

		int from=prev_pos;
	//	int to=pos;

		if (p_slice==i) {

			return substr( from, pos-from );
		}

		if (pos==length()) //reached end and no find
			break;
		pos+=p_splitter.length();
		prev_pos=pos;
		i++;
	}

	return ""; //no find!

}

String String::get_slicec(CharType p_splitter, int p_slice) const {

	if (empty())
		return String();

	if (p_slice<0)
		return String();

	const CharType *c=this->ptr();
	int i=0;
	int prev=0;
	int count=0;
	while(true) {


		if (c[i]==0 || c[i]==p_splitter) {

			if (p_slice==count) {

				return substr(prev,i-prev);
			} else {
				count++;
				prev=i+1;
			}

		}

		i++;

	}

	return String(); //no find!

}


Vector<String> String::split_spaces() const {

	Vector<String> ret;
	int from=0;
	int i=0;
	int len = length();
	bool inside=false;

	while(true) {

		bool empty=operator[](i)<33;

		if (i==0)
			inside=!empty;

		if (!empty && !inside) {
			inside=true;
			from=i;
		}

		if (empty && inside) {

			ret.push_back(substr(from,i-from));
			inside=false;
		}

		if (i==len)
			break;
		i++;
	}

	return ret;

}

Vector<String> String::split(const String &p_splitter,bool p_allow_empty) const {

	Vector<String> ret;
	int from=0;
	int len = length();

	while(true) {

		int end=find(p_splitter,from);
		if (end<0)
			end=len;
		if (p_allow_empty || (end>from))
			ret.push_back(substr(from,end-from));

		if (end==len)
			break;

		from = end+p_splitter.length();
	}

	return ret;
}

Vector<float> String::split_floats(const String &p_splitter,bool p_allow_empty) const {

	Vector<float> ret;
	int from=0;
	int len = length();

	while(true) {

		int end=find(p_splitter,from);
		if (end<0)
			end=len;
		if (p_allow_empty || (end>from))
			ret.push_back(String::to_double(&c_str()[from]));

		if (end==len)
			break;

		from = end+p_splitter.length();
	}

	return ret;
}

Vector<float> String::split_floats_mk(const Vector<String> &p_splitters,bool p_allow_empty) const {

	Vector<float> ret;
	int from=0;
	int len = length();

	while(true) {

		int idx;
		int end=findmk(p_splitters,from,&idx);
		int spl_len=1;
		if (end<0) {
			end=len;
		} else {
			spl_len=p_splitters[idx].length();
		}

		if (p_allow_empty || (end>from)) {
			ret.push_back(String::to_double(&c_str()[from]));
		}

		if (end==len)
			break;

		from = end+spl_len;
	}

	return ret;


}


Vector<int> String::split_ints(const String &p_splitter,bool p_allow_empty) const {

	Vector<int> ret;
	int from=0;
	int len = length();

	while(true) {

		int end=find(p_splitter,from);
		if (end<0)
			end=len;
		if (p_allow_empty || (end>from))
			ret.push_back(String::to_int(&c_str()[from],end-from));

		if (end==len)
			break;

		from = end+p_splitter.length();
	}

	return ret;
}

Vector<int> String::split_ints_mk(const Vector<String> &p_splitters,bool p_allow_empty) const {

	Vector<int> ret;
	int from=0;
	int len = length();

	while(true) {

		int idx;
		int end=findmk(p_splitters,from,&idx);
		int spl_len=1;
		if (end<0) {
			end=len;
		} else {
			spl_len=p_splitters[idx].length();
		}

		if (p_allow_empty || (end>from))
			ret.push_back(String::to_int(&c_str()[from],end-from));

		if (end==len)
			break;

		from = end+spl_len;
	}

	return ret;


}


CharType String::char_uppercase(CharType p_char) {

	return _find_upper(p_char);
}

CharType String::char_lowercase(CharType p_char){

	return _find_lower(p_char);
}


String String::to_upper() const {

	String upper=*this;

	for(int i=0;i<upper.size();i++) {

		upper[i]=_find_upper(upper[i]);
	}

	return upper;
}

String String::to_lower() const {

	String upper=*this;

	for(int i=0;i<upper.size();i++) {

		upper[i]=_find_lower(upper[i]);
	}

	return upper;
}

int String::length() const {

	int s=size();
	return s?(s-1):0; // length does not include zero
}


const CharType * String::c_str() const {

	static const CharType zero=0;

	return size()?&operator[](0):&zero;
}

String String::md5(const uint8_t *p_md5) {
	return String::hex_encode_buffer(p_md5, 16);
}

String String::hex_encode_buffer(const uint8_t *p_buffer, int p_len) {
	static const char hex[16]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

	String ret;
	char v[2]={0,0};

	for(int i=0;i<p_len;i++) {
		v[0]=hex[p_buffer[i]>>4];
		ret+=v;
		v[0]=hex[p_buffer[i]&0xF];
		ret+=v;
	}

	return ret;
}

String String::chr(CharType p_char) {

	CharType c[2]={p_char,0};
	return String(c);

}
String String::num(double p_num,int p_decimals) {


#ifndef NO_USE_STDLIB

	if (p_decimals>12)
		p_decimals=12;


	char fmt[7];
	fmt[0]='%';
	fmt[1]='.';

	if (p_decimals<0) {

		fmt[1]='l';
		fmt[2]='f';
		fmt[3]=0;

	} else if(p_decimals<10) {
		fmt[2]='0'+p_decimals;
		fmt[3]='l';
		fmt[4]='f';
		fmt[5]=0;
	} else {
		fmt[2]='0'+(p_decimals/10);
		fmt[3]='0'+(p_decimals%10);
		fmt[4]='l';
		fmt[5]='f';
		fmt[6]=0;

	}
	char buf[256];

#if defined(__GNUC__) || defined(_MSC_VER)
	snprintf(buf,256,fmt,p_num);
#else
	sprintf(buf,fmt,p_num);
#endif

	buf[255]=0;
	//destroy trailing zeroes
	{

		bool period=false;
		int z=0;
		while(buf[z]) {
			if (buf[z]=='.')
				period=true;
			z++;
		}

		if (period) {
			z--;
			while(z>0) {


				if (buf[z]=='0') {

					buf[z]=0;
				} else if (buf[z]=='.') {

					buf[z]=0;
					break;
				} else {

					break;
				}

				z--;

			}
		}
	}



	return buf;
#else

	String s;
	String sd;
	/* integer part */

	bool neg=p_num<0;
	p_num=ABS(p_num);
	int intn=(int)p_num;


	/* decimal part */


	if (p_decimals>0 || (p_decimals==-1 && (int)p_num!=p_num)) {

		double dec=p_num-(float)((int)p_num);

		int digit=0;
		if (p_decimals>MAX_DIGITS)
			p_decimals=MAX_DIGITS;

		int dec_int=0;
		int dec_max=0;

		while (true) {

			dec*=10.0;
			dec_int=dec_int*10+(int)dec%10;
			dec_max=dec_max*10+9;
			digit++;



			if (p_decimals==-1) {

				if (digit==MAX_DIGITS) //no point in going to infinite
					break;

				if ((dec-(float)((int)dec))<1e-6)
					break;
			}

			if (digit==p_decimals)
				break;


		}
		dec*=10;
		int last=(int)dec%10;

		if (last>5) {
			if (dec_int==dec_max) {

				dec_int=0;
				intn++;
			} else {

				dec_int++;
			}
		}

		String decimal;
		for (int i=0;i<digit;i++) {

			char num[2]={0,0};
			num[0]='0'+dec_int%10;
			decimal=num+decimal;
			dec_int/=10;

		}
		sd='.'+decimal;

	}

	if (intn==0)

		s="0";
	else {
		while(intn) {

			CharType num='0'+(intn%10);
			intn/=10;
			s=num+s;

		}
	}

	s=s+sd;
	if (neg)
		s="-"+s;
	return s;
#endif

}

String String::num_int64(int64_t p_num, int base, bool capitalize_hex) {

	bool sign=p_num<0;
	int64_t num=ABS(p_num);

	int64_t n=num;

	int chars=0;
	do {
		n/=base;
		chars++;
	} while(n);

	if (sign)
		chars++;
	String s;
	s.resize(chars+1);
	CharType *c=s.ptr();
	c[chars]=0;
	n=num;
	do {
		int mod = n%base;
		if (mod >= 10) {
			char a = (capitalize_hex ? 'A' : 'a');
			c[--chars]=a+(mod - 10);
		} else {
			c[--chars]='0'+mod;
		}

		n/=base;
	} while(n);

	if (sign)
		c[0]='-';

	return s;
}

String String::num_real(double p_num) {

	String s;
	String sd;
	/* integer part */

	bool neg=p_num<0;
	p_num=ABS(p_num);
	int intn=(int)p_num;

	/* decimal part */


	if ((int)p_num!=p_num) {

		double dec=p_num-(float)((int)p_num);

		int digit=0;
		int decimals=MAX_DIGITS;

		int dec_int=0;
		int dec_max=0;

		while (true) {

			dec*=10.0;
			dec_int=dec_int*10+(int)dec%10;
			dec_max=dec_max*10+9;
			digit++;

			if ((dec-(float)((int)dec))<1e-6)
				break;

			if (digit==decimals)
				break;

		}

		dec*=10;
		int last=(int)dec%10;

		if (last>5) {
			if (dec_int==dec_max) {

				dec_int=0;
				intn++;
			} else {

				dec_int++;
			}
		}

		String decimal;
		for (int i=0;i<digit;i++) {

			char num[2]={0,0};
			num[0]='0'+dec_int%10;
			decimal=num+decimal;
			dec_int/=10;

		}
		sd='.'+decimal;
	} else {
		sd=".0";
	}

	if (intn==0)

		s="0";
	else {
		while(intn) {

			CharType num='0'+(intn%10);
			intn/=10;
			s=num+s;

		}
	}

	s=s+sd;
	if (neg)
		s="-"+s;
	return s;

}


String String::num_scientific(double p_num) {

#ifndef NO_USE_STDLIB


	char buf[256];

#if defined(__GNUC__) || defined(_MSC_VER)
	snprintf(buf,256,"%lg",p_num);
#else
	sprintf(buf,"%.16lg",p_num);
#endif

	buf[255]=0;

	return buf;
#else

	return String::num(p_num);
#endif
}

CharString String::ascii(bool p_allow_extended) const {

	if (!length())
		return CharString();

	CharString cs;
	cs.resize(size());

	for (int i=0;i<size();i++)
		cs[i]=operator[](i);

	return cs;

}

String String::utf8(const char* p_utf8,int p_len) {

	String ret;
	ret.parse_utf8(p_utf8,p_len);

	return ret;
};
#if 0
_FORCE_INLINE static int parse_utf8_char(const char *p_utf8,unsigned int *p_ucs4,int p_left) { //return len


	int len=0;

/* Determine the number of characters in sequence */
	if ((*p_utf8 & 0x80)==0)
		len=1;
	else if ((*p_utf8 & 0xE0)==0xC0)
		len=2;
	else if ((*p_utf8 & 0xF0)==0xE0)
		len=3;
	else if ((*p_utf8 & 0xF8)==0xF0)
		len=4;
	else if ((*p_utf8 & 0xFC)==0xF8)
		len=5;
	else if ((*p_utf8 & 0xFE)==0xFC)
		len=6;
	else
		return -1; //invalid UTF8

	if (len>p_left)
		return -1; //not enough space

	if (len==2 && (*p_utf8&0x1E)==0) {
		//printf("overlong rejected\n");
		return -1; //reject overlong
	}

	/* Convert the first character */

	unsigned int unichar=0;

	if (len == 1)
		unichar=*p_utf8;
	else {

		unichar=(0xFF >> (len +1)) & *p_utf8;;

		for (int i=1;i<len;i++) {

			if ((p_utf8[i] & 0xC0) != 0x80) {
				//printf("invalid utf8\n");
				return -1; //invalid utf8
			}
			if (unichar==0 && i==2 && ((p_utf8[i] & 0x7F) >> (7 - len)) == 0) {
				//printf("no overlong\n");
				return -1; //no overlong
			}
			unichar = (unichar << 6) | (p_utf8[i] & 0x3F);
		}
	}

	*p_ucs4=unichar;

	return len;

}
#endif
bool String::parse_utf8(const char* p_utf8,int p_len) {

#define _UNICERROR(m_err) print_line("unicode error: "+String(m_err));

	String aux;

	int cstr_size=0;
	int str_size=0;

	/* HANDLE BOM (Byte Order Mark) */
	if (p_len<0 || p_len>=3) {

		bool has_bom = uint8_t(p_utf8[0])==0xEF && uint8_t(p_utf8[1])==0xBB && uint8_t(p_utf8[2])==0xBF;
		if (has_bom) {

			//just skip it
			if (p_len>=0)
				p_len-=3;
			p_utf8+=3;
		}
	}

	{
		const char *ptrtmp=p_utf8;
		const char *ptrtmp_limit=&p_utf8[p_len];
		int skip=0;
		while (ptrtmp!=ptrtmp_limit && *ptrtmp) {

			if (skip==0) {

				uint8_t c = *ptrtmp;

				/* Determine the number of characters in sequence */
				if ((c & 0x80)==0)
					skip=0;
				else if ((c & 0xE0)==0xC0)
					skip=1;
				else if ((c & 0xF0)==0xE0)
					skip=2;
				else if ((c & 0xF8)==0xF0)
					skip=3;
				else if ((c & 0xFC)==0xF8)
					skip=4;
				else if ((c & 0xFE)==0xFC)
					skip=5;
				else {
					_UNICERROR("invalid skip");
					return true; //invalid utf8
				}

				if (skip==1 && (c&0x1E)==0) {
					//printf("overlong rejected\n");
					_UNICERROR("overlong rejected");
					return true; //reject overlong
				}

				str_size++;


			} else {

				--skip;
			}

			cstr_size++;
			ptrtmp++;
		}

		if (skip) {
			_UNICERROR("no space left");
			return true; //not enough spac
		}

	}

	if (str_size==0) {
		clear();
		return false;
	}

	resize(str_size+1);
	CharType *dst = &operator[](0);
	dst[str_size]=0;

	while (cstr_size) {


		int len=0;

	/* Determine the number of characters in sequence */
		if ((*p_utf8 & 0x80)==0)
			len=1;
		else if ((*p_utf8 & 0xE0)==0xC0)
			len=2;
		else if ((*p_utf8 & 0xF0)==0xE0)
			len=3;
		else if ((*p_utf8 & 0xF8)==0xF0)
			len=4;
		else if ((*p_utf8 & 0xFC)==0xF8)
			len=5;
		else if ((*p_utf8 & 0xFE)==0xFC)
			len=6;
		else {
			_UNICERROR("invalid len");

			return true; //invalid UTF8
		}

		if (len>cstr_size) {
			_UNICERROR("no space left");
			return true; //not enough space
		}

		if (len==2 && (*p_utf8&0x1E)==0) {
			//printf("overlong rejected\n");
			_UNICERROR("no space left");
			return true; //reject overlong
		}

		/* Convert the first character */

		uint32_t unichar=0;

		if (len == 1)
			unichar=*p_utf8;
		else {

			unichar=(0xFF >> (len +1)) & *p_utf8;;

			for (int i=1;i<len;i++) {

				if ((p_utf8[i] & 0xC0) != 0x80) {
					_UNICERROR("invalid utf8");
					return true; //invalid utf8
				}
				if (unichar==0 && i==2 && ((p_utf8[i] & 0x7F) >> (7 - len)) == 0) {
					_UNICERROR("invalid utf8 overlong");
					return true; //no overlong
				}
				unichar = (unichar << 6) | (p_utf8[i] & 0x3F);
			}
		}

//		printf("char %i, len %i\n",unichar,len);
		if (sizeof(wchar_t)==2 && unichar>0xFFFF) {
			unichar=' '; //too long for windows

		}

		*(dst++) = unichar;
		cstr_size-=len;
		p_utf8 += len;
	}

	return false;
}



CharString String::utf8() const {

	int l = length();
	if (!l)
		return CharString();

	const CharType *d=&operator[](0);
	int fl=0;
	for (int i=0;i<l;i++) {

		uint32_t c=d[i];
		if (c <= 0x7f) // 7 bits.
			fl+=1;
		else if (c <= 0x7ff) {   // 11 bits
			fl+=2;
		} else if (c <= 0xffff) { // 16 bits
			fl+=3;
		} else if (c <= 0x001fffff) { // 21 bits
			fl+=4;

		} else if (c <= 0x03ffffff) { // 26 bits
			fl+=5;
		} else if (c <= 0x7fffffff) {  // 31 bits
			fl+=6;
		}
	}


	CharString utf8s;
	if (fl==0) {
		return utf8s;
	}

	utf8s.resize(fl+1);
	uint8_t *cdst=(uint8_t*)utf8s.get_data();

#define APPEND_CHAR( m_c ) *(cdst++) = m_c

	for (int i=0;i<l;i++) {

		uint32_t c=d[i];

		if (c <= 0x7f) // 7 bits.
			APPEND_CHAR( c );
		else if (c <= 0x7ff) {   // 11 bits

			APPEND_CHAR( uint32_t(0xc0 | ((c >> 6) & 0x1f)) );  // Top 5 bits.
			APPEND_CHAR( uint32_t(0x80 | (c & 0x3f)) );        // Bottom 6 bits.
		} else if (c <= 0xffff) { // 16 bits

			APPEND_CHAR( uint32_t(0xe0 | ((c >> 12) & 0x0f)) ); // Top 4 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 6) & 0x3f)) );  // Middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | (c & 0x3f)) );        // Bottom 6 bits.
		} else if (c <= 0x001fffff) { // 21 bits

			APPEND_CHAR( uint32_t(0xf0 | ((c >> 18) & 0x07)) ); // Top 3 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 12) & 0x3f)) ); // Upper middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 6) & 0x3f)) );  // Lower middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | (c & 0x3f)) );        // Bottom 6 bits.
		} else if (c <= 0x03ffffff) { // 26 bits

			APPEND_CHAR( uint32_t(0xf8 | ((c >> 24) & 0x03)) ); // Top 2 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 18) & 0x3f)) ); // Upper middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 12) & 0x3f)) ); // middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 6) & 0x3f)) );  // Lower middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | (c & 0x3f)) );        // Bottom 6 bits.
		} else if (c <= 0x7fffffff) {  // 31 bits

			APPEND_CHAR( uint32_t(0xfc | ((c >> 30) & 0x01)) ); // Top 1 bit.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 24) & 0x3f)) ); // Upper upper middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 18) & 0x3f)) ); // Lower upper middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 12) & 0x3f)) ); // Upper lower middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | ((c >> 6) & 0x3f)) );  // Lower lower middle 6 bits.
			APPEND_CHAR( uint32_t(0x80 | (c & 0x3f)) );        // Bottom 6 bits.
		}
	}
#undef APPEND_CHAR
	*cdst=0; //trailing zero

	return utf8s;
}


/*
String::String(CharType p_char) {

	shared=NULL;
	copy_from(p_char);
}
*/

String::String(const char *p_str) {

	copy_from(p_str);
}
String::String(const CharType *p_str,int p_clip_to_len) {

	copy_from(p_str,p_clip_to_len);
}


String::String(const StrRange& p_range) {

	if (!p_range.c_str)
		return;

	copy_from(p_range.c_str,p_range.len);
}

int String::hex_to_int() const {

    int l = length();
    if (l<3)
           return 0;

    const CharType *s=ptr();

    int sign = s[0]=='-' ? -1 : 1;

    if (sign<0) {
        s++;
        l--;
        if (l<2)
            return 0;
    }

    if (s[0]!='0' || s[1]!='x')
           return 0;

    s+=2;
    l-=2;

    int hex=0;

    while(*s) {

        CharType c = LOWERCASE(*s);
        int n;
        if (c>='0' && c<='9') {
            n=c-'0';
        } else if (c>='a' && c<='f') {
            n=(c-'a')+10;
        } else {
            return 0;
        }

        hex*=16;
        hex+=n;
        s++;
    }

    return hex*sign;

}

int String::to_int() const {

	if (length()==0)
		return 0;

	int to=(find(".")>=0) ? find(".") : length() ;

	int integer=0;
	int sign=1;

	for (int i=0;i<to;i++) {

		CharType c=operator[](i);
		if (c>='0' && c<='9') {

			integer*=10;
			integer+=c-'0';

		} else if (integer==0 && c=='-') {

			sign=-sign;
		}

	}

	return integer*sign;
}

int64_t String::to_int64() const {

	if (length()==0)
		return 0;

	int to=(find(".")>=0) ? find(".") : length() ;

	int64_t integer=0;
	int64_t sign=1;

	for (int i=0;i<to;i++) {

		CharType c=operator[](i);
		if (c>='0' && c<='9') {

			integer*=10;
			integer+=c-'0';

		} else if (integer==0 && c=='-') {

			sign=-sign;
		}

	}

	return integer*sign;
}

int String::to_int(const char* p_str,int p_len) {


	int to=0;
	if (p_len>=0)
		to=p_len;
	else {
		while(p_str[to]!=0 && p_str[to]!='.')
			to++;
	}


	int integer=0;
	int sign=1;

	for (int i=0;i<to;i++) {

		char c=p_str[i];
		if (c>='0' && c<='9') {

			integer*=10;
			integer+=c-'0';

		} else if (c=='-' && integer==0) {

			sign=-sign;
		} else if (c!=' ')
			break;

	}

	return integer*sign;
}

bool String::is_numeric() const {

	if (length() == 0) {
		return false;
	};

	int s = 0;
	if (operator[](0) == '-') ++s;
	bool dot = false;
	for (int i=s; i<length(); i++) {

		CharType c = operator[](i);
		if (c == '.') {
			if (dot) {
				return false;
			};
			dot = true;
		}
		if (c < '0' || c > '9') {
			return false;
		};
	};

	return true; // TODO: Use the parser below for this instead
};

#define IS_DIGIT(m_d) ( (m_d)>='0' && (m_d)<='9' )
#define IS_HEX_DIGIT(m_d) ( ( (m_d)>='0' && (m_d)<='9' ) || ( (m_d)>='a' && (m_d)<='f' ) || ( (m_d)>='A' && (m_d)<='F' ) )

template<class C>
static double built_in_strtod(const C *string,         /* A decimal ASCII floating-point number,
				 * optionally preceded by white space. Must
				 * have form "-I.FE-X", where I is the integer
				 * part of the mantissa, F is the fractional
				 * part of the mantissa, and X is the
				 * exponent. Either of the signs may be "+",
				 * "-", or omitted. Either I or F may be
				 * omitted, or both. The decimal point isn't
				 * necessary unless F is present. The "E" may
				 * actually be an "e". E and X may both be
				 * omitted (but not just one). */
    C **endPtr=NULL)              /* If non-NULL, store terminating Cacter's
				 * address here. */
{


	static const int maxExponent = 511;     /* Largest possible base 10 exponent.  Any
					 * exponent larger than this will already
					 * produce underflow or overflow, so there's
					 * no need to worry about additional digits.
					 */
	static const double powersOf10[] = {    /* Table giving binary powers of 10.  Entry */
	    10.,                        /* is 10^2^i.  Used to convert decimal */
	    100.,                       /* exponents into floating-point numbers. */
	    1.0e4,
	    1.0e8,
	    1.0e16,
	    1.0e32,
	    1.0e64,
	    1.0e128,
	    1.0e256
	};


    int sign, expSign = false;
    double fraction, dblExp;
    const double *d;
    register const C *p;
    register int c;
    int exp = 0;                /* Exponent read from "EX" field. */
    int fracExp = 0;            /* Exponent that derives from the fractional
				 * part. Under normal circumstatnces, it is
				 * the negative of the number of digits in F.
				 * However, if I is very long, the last digits
				 * of I get dropped (otherwise a long I with a
				 * large negative exponent could cause an
				 * unnecessary overflow on I alone). In this
				 * case, fracExp is incremented one for each
				 * dropped digit. */
    int mantSize;               /* Number of digits in mantissa. */
    int decPt;                  /* Number of mantissa digits BEFORE decimal
				 * point. */
    const C *pExp;           /* Temporarily holds location of exponent in
				 * string. */

    /*
     * Strip off leading blanks and check for a sign.
     */

    p = string;
    while (*p == ' ' || *p=='\t' || *p=='\n') {
	p += 1;
    }
    if (*p == '-') {
	sign = true;
	p += 1;
    } else {
	if (*p == '+') {
	    p += 1;
	}
	sign = false;
    }

    /*
     * Count the number of digits in the mantissa (including the decimal
     * point), and also locate the decimal point.
     */

    decPt = -1;
    for (mantSize = 0; ; mantSize += 1)
    {
	c = *p;
	if (!IS_DIGIT(c)) {
	    if ((c != '.') || (decPt >= 0)) {
		break;
	    }
	    decPt = mantSize;
	}
	p += 1;
    }

    /*
     * Now suck up the digits in the mantissa. Use two integers to collect 9
     * digits each (this is faster than using floating-point). If the mantissa
     * has more than 18 digits, ignore the extras, since they can't affect the
     * value anyway.
     */

    pExp  = p;
    p -= mantSize;
    if (decPt < 0) {
	decPt = mantSize;
    } else {
	mantSize -= 1;          /* One of the digits was the point. */
    }
    if (mantSize > 18) {
	fracExp = decPt - 18;
	mantSize = 18;
    } else {
	fracExp = decPt - mantSize;
    }
    if (mantSize == 0) {
	fraction = 0.0;
	p = string;
	goto done;
    } else {
	int frac1, frac2;

	frac1 = 0;
	for ( ; mantSize > 9; mantSize -= 1) {
	    c = *p;
	    p += 1;
	    if (c == '.') {
		c = *p;
		p += 1;
	    }
	    frac1 = 10*frac1 + (c - '0');
	}
	frac2 = 0;
	for (; mantSize > 0; mantSize -= 1) {
	    c = *p;
	    p += 1;
	    if (c == '.') {
		c = *p;
		p += 1;
	    }
	    frac2 = 10*frac2 + (c - '0');
	}
	fraction = (1.0e9 * frac1) + frac2;
    }

    /*
     * Skim off the exponent.
     */

    p = pExp;
    if ((*p == 'E') || (*p == 'e')) {
	p += 1;
	if (*p == '-') {
	    expSign = true;
	    p += 1;
	} else {
	    if (*p == '+') {
		p += 1;
	    }
	    expSign = false;
	}
	if (!IS_DIGIT(CharType(*p))) {
	    p = pExp;
	    goto done;
	}
	while (IS_DIGIT(CharType(*p))) {
	    exp = exp * 10 + (*p - '0');
	    p += 1;
	}
    }
    if (expSign) {
	exp = fracExp - exp;
    } else {
	exp = fracExp + exp;
    }

    /*
     * Generate a floating-point number that represents the exponent. Do this
     * by processing the exponent one bit at a time to combine many powers of
     * 2 of 10. Then combine the exponent with the fraction.
     */

    if (exp < 0) {
	expSign = true;
	exp = -exp;
    } else {
	expSign = false;
    }

    if (exp > maxExponent) {
	exp = maxExponent;
	WARN_PRINT("Exponent too high");
    }
    dblExp = 1.0;
    for (d = powersOf10; exp != 0; exp >>= 1, ++d) {
	if (exp & 01) {
	    dblExp *= *d;
	}
    }
    if (expSign) {
	fraction /= dblExp;
    } else {
	fraction *= dblExp;
    }

  done:
    if (endPtr != NULL) {
	*endPtr = (C *) p;
    }

    if (sign) {
	return -fraction;
    }
    return fraction;
}



#define READING_SIGN 0
#define READING_INT 1
#define READING_DEC 2
#define READING_EXP 3
#define READING_DONE 4

double String::to_double(const char* p_str)  {

#ifndef NO_USE_STDLIB
	return built_in_strtod<char>(p_str);
	//return atof(p_str); DOES NOT WORK ON ANDROID(??)
#else
	return built_in_strtod<char>(p_str);
#endif
#if 0
#if 0


	return atof(p_str);
#else
	if (!p_str[0])
		return 0;
///@todo make more exact so saving and loading does not lose precision

	double integer=0;
	double decimal=0;
	double decimal_mult=0.1;
	double sign=1.0;
	double exp=0;
	double exp_sign=1.0;
	int reading=READING_SIGN;

	const char *str=p_str;

	while(*str && reading!=READING_DONE) {

		CharType c=*(str++);
		switch(reading) {
			case READING_SIGN: {
				if (c>='0' && c<='9')
					reading=READING_INT;
					// let it fallthrough
				else if (c=='-') {
					sign=-1.0;
					reading=READING_INT;
					break;
				} else if (c=='.') {
					reading=READING_DEC;
					break;
				} else {
					break;
				}
			}
			case READING_INT: {

				if (c>='0' && c<='9') {

					integer*=10;
					integer+=c-'0';
				} else if (c=='.') {
					reading=READING_DEC;
				} else if (c=='e') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_DEC: {

				if (c>='0' && c<='9') {

					decimal+=(c-'0')*decimal_mult;
					decimal_mult*=0.1;
				} else if (c=='e') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_EXP: {

				if (c>='0' && c<='9') {

					exp*=10.0;
					exp+=(c-'0');
				} else if (c=='-' && exp==0) {
					exp_sign=-1.0;
				} else if (exp_sign>=0 && c=='+') {
					//redundant...
					exp_sign=1.0;
				} else {
					reading=READING_DONE;
				}
			 } break;
		}
	}

	return sign*(integer+decimal)*Math::pow(10,exp_sign*exp);
#endif
#endif
}


float String::to_float() const {

	return to_double();
}

double String::to_double(const CharType* p_str, const CharType **r_end)  {

	return built_in_strtod<CharType>(p_str,(CharType**)r_end);
#if 0
#if 0
	//ndef NO_USE_STDLIB
	return wcstod(p_str,p_len<0?NULL:p_str+p_len);
#else
	if (p_len==0 || !p_str[0])
		return 0;
///@todo make more exact so saving and loading does not lose precision

	double integer=0;
	double decimal=0;
	double decimal_mult=0.1;
	double sign=1.0;
	double exp=0;
	double exp_sign=1.0;
	int reading=READING_SIGN;

	const CharType *str=p_str;
	const CharType *limit=&p_str[p_len];

	while(reading!=READING_DONE && str!=limit) {

		CharType c=*(str++);
		switch(reading) {
			case READING_SIGN: {
				if (c>='0' && c<='9')
					reading=READING_INT;
					// let it fallthrough
				else if (c=='-') {
					sign=-1.0;
					reading=READING_INT;
					break;
				} else if (c=='.') {
					reading=READING_DEC;
					break;
				} else if (c==0) {
					reading=READING_DONE;
					break;
				} else {
					break;
				}
			}
			case READING_INT: {

				if (c>='0' && c<='9') {

					integer*=10;
					integer+=c-'0';
				} else if (c=='.') {
					reading=READING_DEC;
				} else if (c=='e' || c=='E') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_DEC: {

				if (c>='0' && c<='9') {

					decimal+=(c-'0')*decimal_mult;
					decimal_mult*=0.1;
				} else if (c=='e' || c=='E') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_EXP: {

				if (c>='0' && c<='9') {

					exp*=10.0;
					exp+=(c-'0');
				} else if (c=='-' && exp==0) {
					exp_sign=-1.0;
				} else if (exp_sign>=0 && c=='+') {
					//redundant...
					exp_sign=1.0;
				} else {
					reading=READING_DONE;
				}
			 } break;
		}
	}

	if (r_end)
		*r_end=str-1;

	return sign*(integer+decimal)*Math::pow(10,exp_sign*exp);
#endif
#endif
}

int64_t String::to_int(const CharType* p_str,int p_len)  {

	if (p_len==0 || !p_str[0])
		return 0;
///@todo make more exact so saving and loading does not lose precision

	int64_t integer=0;
	int64_t sign=1;
	int reading=READING_SIGN;

	const CharType *str=p_str;
	const CharType *limit=&p_str[p_len];

	while(*str && reading!=READING_DONE && str!=limit) {

		CharType c=*(str++);
		switch(reading) {
			case READING_SIGN: {
				if (c>='0' && c<='9') {
					reading=READING_INT;
					// let it fallthrough
				} else if (c=='-') {
					sign=-1;
					reading=READING_INT;
					break;
				} else if (c=='+') {
					sign=1;
					reading=READING_INT;
					break;
				} else {
					break;
				}
			}
			case READING_INT: {

				if (c>='0' && c<='9') {

					integer*=10;
					integer+=c-'0';
				} else {
					reading=READING_DONE;
				}

			 } break;
		}
	}

	return sign*integer;

}


double String::to_double() const {

	if (empty())
		return 0;
#ifndef NO_USE_STDLIB
	return built_in_strtod<CharType>(c_str());
	//return wcstod(c_str(),NULL); DOES NOT WORK ON ANDROID :(
#else
	return built_in_strtod<CharType>(c_str());
#endif
#if 0
#ifndef NO_USE_STDLIB

	return atof(utf8().get_data());
#else

	double integer=0;
	double decimal=0;
	double decimal_mult=0.1;
	double sign=1.0;
	double exp=0;
	double exp_sign=1.0;
	int reading=READING_SIGN;

	const CharType *str=&operator[](0);

	while(*str && reading!=READING_DONE) {

		CharType c=*(str++);
		switch(reading) {
			case READING_SIGN: {
				if (c>='0' && c<='9')
					reading=READING_INT;
					// let it fallthrough
				else if (c=='-') {
					sign=-1.0;
					reading=READING_INT;
					break;
				} else if (c=='.') {
					reading=READING_DEC;
					break;
				} else {
					break;
				}
			}
			case READING_INT: {

				if (c>='0' && c<='9') {

					integer*=10;
					integer+=c-'0';
				} else if (c=='.') {
					reading=READING_DEC;
				} else if (c=='e') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_DEC: {

				if (c>='0' && c<='9') {

					decimal+=(c-'0')*decimal_mult;
					decimal_mult*=0.1;
				} else if (c=='e') {
					reading=READING_EXP;
				} else {
					reading=READING_DONE;
				}

			 } break;
			case READING_EXP: {

				if (c>='0' && c<='9') {

					exp*=10.0;
					exp+=(c-'0');
				} else if (c=='-' && exp==0) {
					exp_sign=-1.0;
				} else if (exp_sign>=0 && c=='+') {
					//redundant...
					exp_sign=1.0;
				} else {
					reading=READING_DONE;
				}
			 } break;
		}
	}

	return sign*(integer+decimal)*Math::pow(10,exp_sign*exp);
#endif
#if 0


	double ret=sign*(integer+decimal)*Math::pow(10,exp_sign*exp);

	print_line(*this +" == "+rtos(ret));
	return ret;
#endif
#endif
}


bool operator==(const char*p_chr, const String& p_str) {

	return p_str==p_chr;
}

String operator+(const char*p_chr, const String& p_str) {

	String tmp=p_chr;
	tmp+=p_str;
	return tmp;

}
String operator+(CharType p_chr, const String& p_str) {

	return (String::chr(p_chr)+p_str);

}

uint32_t String::hash(const char* p_cstr) {

	uint32_t hashv = 5381;
	uint32_t c;

	while ((c = *p_cstr++))
		hashv = ((hashv << 5) + hashv) + c; /* hash * 33 + c */

	return hashv;
}

uint32_t String::hash(const char* p_cstr,int p_len) {

	uint32_t hashv = 5381;
	for(int i=0;i<p_len;i++)
		hashv = ((hashv << 5) + hashv) + p_cstr[i]; /* hash * 33 + c */

	return hashv;
}

uint32_t String::hash(const CharType* p_cstr,int p_len) {

	uint32_t hashv = 5381;
	for(int i=0;i<p_len;i++)
		hashv = ((hashv << 5) + hashv) + p_cstr[i]; /* hash * 33 + c */

	return hashv;
}

uint32_t String::hash(const CharType* p_cstr) {

	uint32_t hashv = 5381;
	uint32_t c;

	while ((c = *p_cstr++))
		hashv = ((hashv << 5) + hashv) + c; /* hash * 33 + c */

	return hashv;
}

uint32_t String::hash() const {

	/* simple djb2 hashing */

	const CharType * chr = c_str();
	uint32_t hashv = 5381;
	uint32_t c;

	while ((c = *chr++))
		hashv = ((hashv << 5) + hashv) + c; /* hash * 33 + c */

	return hashv;


}

uint64_t String::hash64() const {

	/* simple djb2 hashing */

	const CharType * chr = c_str();
	uint64_t hashv = 5381;
	uint64_t c;

	while ((c = *chr++))
		hashv = ((hashv << 5) + hashv) + c; /* hash * 33 + c */

	return hashv;


}

String String::md5_text() const {

	CharString cs=utf8();
	MD5_CTX ctx;
	MD5Init(&ctx);
	MD5Update(&ctx,(unsigned char*)cs.ptr(),cs.length());
	MD5Final(&ctx);
	return String::md5(ctx.digest);
}

String String::sha256_text() const {
	CharString cs=utf8();
	unsigned char hash[32];
	sha256_context ctx;
	sha256_init(&ctx);
	sha256_hash(&ctx,(unsigned char*)cs.ptr(),cs.length());
	sha256_done(&ctx, hash);
	return String::hex_encode_buffer(hash, 32);
}

Vector<uint8_t> String::md5_buffer() const {

	CharString cs=utf8();
	MD5_CTX ctx;
	MD5Init(&ctx);
	MD5Update(&ctx,(unsigned char*)cs.ptr(),cs.length());
	MD5Final(&ctx);

	Vector<uint8_t> ret;
	ret.resize(16);
	for (int i=0; i<16; i++) {
		ret[i] = ctx.digest[i];
	};

	return ret;
};

Vector<uint8_t> String::sha256_buffer() const {
	CharString cs = utf8();
	unsigned char hash[32];
	sha256_context ctx;
	sha256_init(&ctx);
	sha256_hash(&ctx, (unsigned char*)cs.ptr(), cs.length());
	sha256_done(&ctx, hash);

	Vector<uint8_t> ret;
	ret.resize(32);
	for (int i = 0; i < 32; i++) {
		ret[i] = hash[i];
	}

	return ret;
}


String String::insert(int p_at_pos,String p_string) const {

	if (p_at_pos<0)
		return *this;

	if (p_at_pos>length())
		p_at_pos=length();


	String pre;
	if (p_at_pos>0)
		pre=substr( 0, p_at_pos );

	String post;
	if (p_at_pos<length())
		post=substr( p_at_pos, length()-p_at_pos);

	return pre+p_string+post;

}
String String::substr(int p_from,int p_chars) const{

	if (empty() || p_from<0 || p_from>=length() || p_chars<=0)
		return "";

	if ( (p_from+p_chars)>length()) {

		p_chars=length()-p_from;
	}

	return String(&c_str()[p_from],p_chars);

}

int String::find_last(String p_str) const {

	int pos=-1;
	int findfrom=0;
	int findres=-1;
	while((findres=find(p_str,findfrom))!=-1) {

		pos=findres;
		findfrom=pos+1;
	}

	return pos;
}
int String::find(String p_str,int p_from) const {

	if (p_from<0)
		return -1;

	int src_len=p_str.length();

	int len=length();

	if(src_len==0 || len==0)
		return -1; //wont find anything!


	const CharType *src = c_str();

	for (int i=p_from;i<=(len-src_len);i++) {

		bool found=true;
		for (int j=0;j<src_len;j++) {

			int read_pos=i+j;

			if (read_pos>=len) {

				ERR_PRINT("read_pos>=len");
				return -1;
			};


			if (src[read_pos]!=p_str[j]) {
				found=false;
				break;
			}
		}

		if (found)
			return i;
	}

	return -1;
}

int String::findmk(const Vector<String>& p_keys,int p_from,int *r_key) const {

	if (p_from<0)
		return -1;
	if (p_keys.size()==0)
		return -1;

	//int src_len=p_str.length();
	const String *keys=&p_keys[0];
	int key_count=p_keys.size();
	int len = length();

	if(len==0)
		return -1; //wont find anything!

	const CharType *src = c_str();


	for (int i=p_from;i<len;i++) {

		bool found=true;
		for(int k=0;k<key_count;k++) {

			found=true;
			if (r_key)
				*r_key=k;
			const CharType *cmp=keys[k].c_str();
			int l=keys[k].length();

			for (int j=0;j<l;j++) {

				int read_pos=i+j;

				if (read_pos>=len) {

					found=false;
					break;
				};


				if (src[read_pos]!=cmp[j]) {
					found=false;
					break;
				}
			}
			if (found)
				break;
		}

		if (found)
			return i;
	}

	return -1;

}


int String::findn(String p_str,int p_from) const {

	if (p_from<0)
		return -1;

	int src_len=p_str.length();

	if(src_len==0 || length()==0)
		return -1; //wont find anything!

	const CharType *srcd = c_str();

	for (int i=p_from;i<=(length()-src_len);i++) {

		bool found=true;
		for (int j=0;j<src_len;j++) {

			int read_pos=i+j;

			if (read_pos>=length()) {

				ERR_PRINT("read_pos>=length()");
				return -1;
			};


			CharType src=_find_lower(srcd[read_pos]);
			CharType dst=_find_lower(p_str[j]);

			if (src!=dst) {
				found=false;
				break;
			}
		}

		if (found)
			return i;
	}

	return -1;
}

int String::rfind(String p_str,int p_from) const {

	//stabilish a limit
	int limit = length()-p_str.length();
	if (limit<0)
		return -1;

	//stabilish a starting point
	if (p_from<0)
		p_from=limit;
	else if (p_from>limit)
		p_from=limit;

	int src_len=p_str.length();
	int len=length();

	if(src_len==0 || len==0)
		return -1; //wont find anything!


	const CharType *src = c_str();

	for (int i=p_from;i>=0;i--) {

		bool found=true;
		for (int j=0;j<src_len;j++) {

			int read_pos=i+j;

			if (read_pos>=len) {

				ERR_PRINT("read_pos>=len");
				return -1;
			};


			if (src[read_pos]!=p_str[j]) {
				found=false;
				break;
			}
		}

		if (found)
			return i;
	}

	return -1;
}
int String::rfindn(String p_str,int p_from) const {

	//stabilish a limit
	int limit = length()-p_str.length();
	if (limit<0)
		return -1;

	//stabilish a starting point
	if (p_from<0)
		p_from=limit;
	else if (p_from>limit)
		p_from=limit;

	int src_len=p_str.length();
	int len=length();

	if(src_len==0 || len==0)
		return -1; //wont find anything!


	const CharType *src = c_str();

	for (int i=p_from;i>=0;i--) {

		bool found=true;
		for (int j=0;j<src_len;j++) {

			int read_pos=i+j;

			if (read_pos>=len) {

				ERR_PRINT("read_pos>=len");
				return -1;
			};

			CharType srcc=_find_lower(src[read_pos]);
			CharType dstc=_find_lower(p_str[j]);


			if (srcc!=dstc) {
				found=false;
				break;
			}
		}

		if (found)
			return i;
	}

	return -1;
}


bool String::ends_with(const String& p_string) const {


	int pos = find_last(p_string);
	if (pos==-1)
		return false;
	return pos+p_string.length()==length();

}

bool String::begins_with(const String& p_string) const {

	if (p_string.length() > length())
		return false;

	int l=p_string.length();
	if (l==0)
		return true;

	const CharType *src=&p_string[0];
	const CharType *str=&operator[](0);

	int i = 0;
	for (;i<l;i++) {

		if (src[i]!=str[i])
			return false;
	}

	// only if i == l the p_string matches the beginning
	return i == l;

}
bool String::begins_with(const char* p_string) const {

	int l=length();
	if (l==0||!p_string)
		return false;

	const CharType *str=&operator[](0);
	int i=0;

	while (*p_string && i<l) {

		if (*p_string != str[i])
			return false;
		i++;
		p_string++;

	}

	return *p_string == 0;

}

bool String::is_subsequence_of(const String& p_string) const {

	return _base_is_subsequence_of(p_string, false);
}

bool String::is_subsequence_ofi(const String& p_string) const {

	return _base_is_subsequence_of(p_string, true);
}

bool String::_base_is_subsequence_of(const String& p_string, bool case_insensitive) const {

	int len=length();
	if (len == 0) {
		// Technically an empty string is subsequence of any string
		return true;
	}

	if (len > p_string.length()) {
		return false;
	}

	const CharType *src = &operator[](0);
	const CharType *tgt = &p_string[0];

	for (;*src && *tgt;tgt++) {
		bool match = false;
		if (case_insensitive) {
			CharType srcc = _find_lower(*src);
			CharType tgtc = _find_lower(*tgt);
			match = srcc == tgtc;
		} else {
			match = *src == *tgt;
		}
		if (match) {
			src++;
			if(!*src) {
				return true;
			}
		}
	}

	return false;
}

Vector<String> String::bigrams() const {
	int n_pairs = length() - 1;
	Vector<String> b;
	if(n_pairs <= 0) {
		return b;
	}
	b.resize(n_pairs);
	for(int i = 0; i < n_pairs; i++) {
		b[i] = substr(i,2);
	}
	return b;
}

// Similarity according to Sorensen-Dice coefficient
float String::similarity(const String& p_string) const {
	if(operator==(p_string)) {
		// Equal strings are totally similar
		return 1.0f;
	}
	if (length() < 2 || p_string.length() < 2) {
		// No way to calculate similarity without a single bigram
		return 0.0f;
	}

	Vector<String> src_bigrams = bigrams();
	Vector<String> tgt_bigrams = p_string.bigrams();

	int src_size = src_bigrams.size();
	int tgt_size = tgt_bigrams.size();

	float sum = src_size + tgt_size;
	float inter = 0;
	for (int i = 0; i < src_size; i++) {
		for (int j = 0; j < tgt_size; j++) {
			if (src_bigrams[i] == tgt_bigrams[j]) {
				inter++;
				break;
			}
		}
	}

	return (2.0f * inter)/sum;
}

static bool _wildcard_match(const CharType* p_pattern, const CharType* p_string,bool p_case_sensitive) {
	switch (*p_pattern) {
	case '\0':
		return !*p_string;
	case '*' :
		return _wildcard_match(p_pattern+1, p_string,p_case_sensitive) || (*p_string && _wildcard_match(p_pattern, p_string+1,p_case_sensitive));
	case '?' :
		return *p_string && (*p_string != '.') && _wildcard_match(p_pattern+1, p_string+1,p_case_sensitive);
	default  :

		return (p_case_sensitive?(*p_string==*p_pattern):(_find_upper(*p_string)==_find_upper(*p_pattern))) && _wildcard_match(p_pattern+1, p_string+1,p_case_sensitive);
	}
}


bool String::match(const String& p_wildcard) const {

	if (!p_wildcard.length() || !length())
		return false;

	return _wildcard_match(p_wildcard.c_str(),c_str(),true);

}

bool String::matchn(const String& p_wildcard) const {

	if (!p_wildcard.length() || !length())
		return false;
	return _wildcard_match(p_wildcard.c_str(),c_str(),false);

}

String String::replace(String p_key,String p_with) const {

	String new_string;
	int search_from=0;
	int result=0;

	while( (result=find(p_key,search_from))>=0 ) {

		new_string+=substr(search_from,result-search_from);
		new_string+=p_with;
		search_from=result+p_key.length();
	}

	new_string+=substr(search_from,length()-search_from);

	return new_string;
}

String String::replace_first(String p_key,String p_with) const {

	String new_string;
	int search_from=0;
	int result=0;

	while( (result=find(p_key,search_from))>=0 ) {

		new_string+=substr(search_from,result-search_from);
		new_string+=p_with;
		search_from=result+p_key.length();
		break;
	}

	new_string+=substr(search_from,length()-search_from);

	return new_string;
}
String String::replacen(String p_key,String p_with) const {

	String new_string;
	int search_from=0;
	int result=0;

	while( (result=findn(p_key,search_from))>=0 ) {

		new_string+=substr(search_from,result-search_from);
		new_string+=p_with;
		search_from=result+p_key.length();
	}

	new_string+=substr(search_from,length()-search_from);
	return new_string;
}


String String::left(int p_pos) const {

	if (p_pos<=0)
		return "";

	if (p_pos>=length())
		return *this;

	return substr(0,p_pos);
}

String String::right(int p_pos) const {

	if (p_pos>=size())
		return *this;

	if (p_pos<0)
		return "";

	return substr(p_pos,(length()-p_pos));
}

CharType String::ord_at(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx, length(), 0);
	return operator[](p_idx);
}

String String::strip_edges(bool left, bool right) const {

	int len=length();
	int beg=0,end=len;

	if(left) {
		for (int i=0;i<len;i++) {

			if (operator[](i)<=32)
				beg++;
			else
				break;
		}
	}

	if(right) {
		for (int i=(int)(len-1);i>=0;i--) {

			if (operator[](i)<=32)
				end--;
			else
				break;
		}
	}

	if (beg==0 && end==len)
		return *this;

	return substr(beg,end-beg);
}

String String::strip_escapes() const {

	int len=length();
	int beg=0,end=len;

	for (int i=0;i<length();i++) {

		if (operator[](i)<=31)
			beg++;
		else
			break;
	}

	for (int i=(int)(length()-1);i>=0;i--) {

		if (operator[](i)<=31)
			end--;
		else
			break;
	}

	if (beg==0 && end==len)
		return *this;

	return substr(beg,end-beg);
}

String String::simplify_path() const {


	String s = *this;
	String drive;
	if (s.begins_with("local://")) {
		drive="local://";
		s=s.substr(8,s.length());
	} else if (s.begins_with("res://")) {

		drive="res://";
		s=s.substr(6,s.length());
	} else if (s.begins_with("user://")) {

		drive="user://";
		s=s.substr(6,s.length());
	} else if (s.begins_with("/") || s.begins_with("\\")) {

		drive=s.substr(0,1);
		s=s.substr(1,s.length()-1);
	} else {

		int p = s.find(":/");
		if (p==-1)
			p=s.find(":\\");
		if (p!=-1 && p < s.find("/")) {

			drive=s.substr(0,p+2);
			s=s.substr(p+2,s.length());
		}
	}

	s =s.replace("\\","/");
	Vector<String> dirs = s.split("/",false);

	for(int i=0;i<dirs.size();i++) {

		String d = dirs[i];
		if (d==".") {
			dirs.remove(i);
			i--;
		} else if (d=="..") {

			if (i==0) {
				dirs.remove(i);
				i--;
			} else {
				dirs.remove(i);
				dirs.remove(i-1);
				i-=2;
			}
		}
	}

	s="";

	for(int i=0;i<dirs.size();i++)	 {

		if (i>0)
			s+="/";
		s+=dirs[i];
	}

	return drive+s;
}

static int _humanize_digits(int p_num) {

	if (p_num<10)
		return 2;
	else if (p_num<100)
		return 2;
	else if (p_num<1024)
		return 1;
	else
		return 0;
}

String String::humanize_size(size_t p_size) {

	uint64_t _div=1;
	static const char* prefix[]={" Bytes"," KB"," MB"," GB","TB"," PB","HB",""};
	int prefix_idx=0;

	while(p_size>(_div*1024) && prefix[prefix_idx][0]) {
		_div*=1024;
		prefix_idx++;
	}

	int digits=prefix_idx>0?_humanize_digits(p_size/_div):0;
	double divisor = prefix_idx>0?_div:1;

	return String::num(p_size/divisor,digits)+prefix[prefix_idx];
}
bool String::is_abs_path() const {

	if (length()>1)
		return (operator[](0)=='/' || operator[](0)=='\\' || find(":/")!=-1 || find(":\\")!=-1);
	else if ((length())==1)
		return (operator[](0)=='/' || operator[](0)=='\\');
	else
		return false;
}

bool String::is_valid_identifier() const {

	int len = length();

	if (len==0)
		return false;

	const wchar_t * str = &operator[](0);


	for(int i=0;i<len;i++) {

		if (i==0) {
			if (str[0]>='0' && str[0]<='9')
				return false; // no start with number plz
		}

		bool valid_char = (str[i]>='0' && str[i]<='9') || (str[i]>='a' && str[i]<='z') || (str[i]>='A' && str[i]<='Z') || str[i]=='_';

		if (!valid_char)
			return false;

	}

	return true;
}

//kind of poor should be rewritten properly

String String::world_wrap(int p_chars_per_line) const {

	int from=0;
	int last_space=0;
	String ret;
	for(int i=0;i<length();i++) {
		if (i-from>=p_chars_per_line) {
			if (last_space==-1) {
				ret+=substr(from,i-from+1)+"\n";
			} else {
				ret+=substr(from,last_space-from)+"\n";
				i=last_space; //rewind
			}
			from=i+1;
			last_space=-1;
		} else if (operator[](i)==' ' || operator[](i)=='\t') {
			last_space=i;
		} else if (operator[](i)=='\n') {
			ret+=substr(from,i-from)+"\n";
			from=i+1;
			last_space=-1;
		}
	}

	if (from<length()) {
		ret+=substr(from,length());
	}

	return ret;
}

String String::http_escape() const {
    const CharString temp = utf8();
    String res;
    for (int i = 0; i < length(); ++i) {
        CharType ord = temp[i];
        if (ord == '.' || ord == '-' || ord == '_' || ord == '~' ||
           (ord >= 'a' && ord <= 'z') ||
           (ord >= 'A' && ord <= 'Z') ||
           (ord >= '0' && ord <= '9')) {
            res += ord;
        } else {
            char h_Val[3];
#if defined(__GNUC__) || defined(_MSC_VER)
            snprintf(h_Val, 3, "%.2X", ord);
#else
            sprintf(h_Val, "%.2X", ord);
#endif
            res += "%";
            res += h_Val;
        }
    }
    return res;
}

String String::http_unescape() const {
    String res;
    for (int i = 0; i < length(); ++i) {
        if (ord_at(i) == '%' && i+2 < length()) {
            CharType ord1 = ord_at(i+1);
            if ((ord1 >= '0' && ord1 <= '9') || (ord1 >= 'A' && ord1 <= 'Z')) {
                CharType ord2 = ord_at(i+2);
                if ((ord2 >= '0' && ord2 <= '9') || (ord2 >= 'A' && ord2 <= 'Z')) {
                    char bytes[2] = {ord1, ord2};
                    res += (char)strtol(bytes, NULL, 16);
                    i+=2;
                }
            } else {
                res += ord_at(i);
            }
        } else {
            res += ord_at(i);
        }
    }
    return String::utf8(res.ascii());
}

String String::c_unescape() const {

	String escaped=*this;
	escaped=escaped.replace("\\a","\a");
	escaped=escaped.replace("\\b","\b");
	escaped=escaped.replace("\\f","\f");
	escaped=escaped.replace("\\n","\n");
	escaped=escaped.replace("\\r","\r");
	escaped=escaped.replace("\\t","\t");
	escaped=escaped.replace("\\v","\v");
	escaped=escaped.replace("\\'","\'");
	escaped=escaped.replace("\\\"","\"");
	escaped=escaped.replace("\\?","\?");
	escaped=escaped.replace("\\\\","\\");

	return escaped;
}

String String::c_escape() const {

	String escaped=*this;
	escaped=escaped.replace("\\","\\\\");
	escaped=escaped.replace("\a","\\a");
	escaped=escaped.replace("\b","\\b");
	escaped=escaped.replace("\f","\\f");
	escaped=escaped.replace("\n","\\n");
	escaped=escaped.replace("\r","\\r");
	escaped=escaped.replace("\t","\\t");
	escaped=escaped.replace("\v","\\v");
	escaped=escaped.replace("\'","\\'");
	escaped=escaped.replace("\"","\\\"");
	escaped=escaped.replace("\?","\\?");

	return escaped;
}

String String::json_escape() const {

	String escaped=*this;
	escaped=escaped.replace("\\","\\\\");
	escaped=escaped.replace("\b","\\b");
	escaped=escaped.replace("\f","\\f");
	escaped=escaped.replace("\n","\\n");
	escaped=escaped.replace("\r","\\r");
	escaped=escaped.replace("\t","\\t");
	escaped=escaped.replace("\v","\\v");
	escaped=escaped.replace("\"","\\\"");

	return escaped;
}

String String::xml_escape(bool p_escape_quotes) const {

	String str=*this;
	str=str.replace("&","&amp;");
	str=str.replace("<","&lt;");
	str=str.replace(">","&gt;");
	if (p_escape_quotes) {
		str=str.replace("'","&apos;");
		str=str.replace("\"","&quot;");
	}
	/*
	for (int i=1;i<32;i++) {

		char chr[2]={i,0};
		str=str.replace(chr,"&#"+String::num(i)+";");
	}*/
	return str;
}

static _FORCE_INLINE_ int _xml_unescape(const CharType *p_src,int p_src_len,CharType *p_dst) {

	int len=0;
	while(p_src_len) {

		if (*p_src=='&') {

			int eat=0;

			if (p_src_len>=4 && p_src[1]=='#') {

				CharType c=0;

				for(int i=2;i<p_src_len;i++) {

					eat=i+1;
					CharType ct=p_src[i];
					if (ct==';') {
						break;
					} else if (ct>='0' && ct<='9') {
						ct=ct-'0';
					} else if (ct>='a' && ct<='f') {
						ct=(ct-'a')+10;
					} else if (ct>='A' && ct<='F') {
						ct=(ct-'A')+10;
					} else {
						continue;
					}
					c<<=4;
					c|=ct;
				}

				if (p_dst)
					*p_dst=c;

			} else if (p_src_len>=4 && p_src[1]=='g' && p_src[2]=='t' && p_src[3]==';') {

				if (p_dst)
					*p_dst='>';
				eat=4;
			} else if (p_src_len>=4 && p_src[1]=='l' && p_src[2]=='t' && p_src[3]==';') {

				if (p_dst)
					*p_dst='<';
				eat=4;
			} else if (p_src_len>=5 && p_src[1]=='a' && p_src[2]=='m' && p_src[3]=='p' && p_src[4]==';') {

				if (p_dst)
					*p_dst='&';
				eat=5;
			} else if (p_src_len>=6 && p_src[1]=='q' && p_src[2]=='u' && p_src[3]=='o' && p_src[4]=='t' && p_src[5]==';') {

				if (p_dst)
					*p_dst='"';
				eat=6;
			} else if (p_src_len>=6 && p_src[1]=='a' && p_src[2]=='p' && p_src[3]=='o' && p_src[4]=='s' && p_src[5]==';') {

				if (p_dst)
					*p_dst='\'';
				eat=6;
			} else {

				if (p_dst)
					*p_dst=*p_src;
				eat=1;

			}

			if (p_dst)
				p_dst++;

			len++;
			p_src+=eat;
			p_src_len-=eat;
		} else {

			if (p_dst) {
				*p_dst=*p_src;
				p_dst++;
			}
			len++;
			p_src++;
			p_src_len--;
		}
	}

	return len;

}

String String::xml_unescape() const {


	String str;
	int l = length();
	int len = _xml_unescape(c_str(),l,NULL);
	if (len==0)
		return String();
	str.resize(len+1);
	_xml_unescape(c_str(),l,&str[0]);
	str[len]=0;
	return str;
}

String String::pad_decimals(int p_digits) const {

	String s=*this;
	int c = s.find(".");

	if (c==-1) {
		if (p_digits<=0) {
			return s;
		}
		s+=".";
		c=s.length()-1;
	} else {
		if (p_digits<=0) {
			return s.substr(0,c);
		}
	}

	if (s.length()-(c+1) > p_digits) {
		s=s.substr(0,c+p_digits+1);
	} else {
		while(s.length()-(c+1) < p_digits) {
			s+="0";
		}
	}
	return s;
}

String String::pad_zeros(int p_digits) const {

	String s=*this;
	int end = s.find(".");

	if (end==-1) {
		end=s.length();
	}


	if (end==0)
		return s;

	int begin=0;

	while (begin<end && (s[begin]<'0' || s[begin]>'9')) {
		begin++;
	}

	if (begin>=end)
		return s;


	while(end-begin < p_digits) {

		s=s.insert(begin,"0");
		end++;
	}

	return s;
}

bool String::is_valid_integer() const {

	int len = length();

	if (len==0)
		return false;

	int from=0;
	if (operator[](0)=='+' || operator[](0)=='-')
		from++;

	for(int i=from;i<len;i++) {

		if (operator[](i)<'0' || operator[](i)>'9')
			return false; // no start with number plz

	}

	return true;

}

bool String::is_valid_float() const {

	int len = length();

	if (len==0)
		return false;

	int from=0;
	if (operator[](0)=='+' || operator[](0)=='-') {
		from++;
	}

	//this was pulled out of my ass, i wonder if it's correct...

	bool exponent_found=false;
	bool period_found=false;
	bool sign_found=false;
	bool exponent_values_found=false;
	bool numbers_found=false;

	for(int i=from;i<len;i++) {

		if (operator[](i)>='0' && operator[](i)<='9') {

			if (exponent_found)
				exponent_values_found=true;
			else
				numbers_found=true;
		} else if (numbers_found && !exponent_found && operator[](i)=='e') {
			exponent_found=true;
		} else if (!period_found && !exponent_found && operator[](i)=='.') {
			period_found=true;
		} else if ((operator[](i)=='-' || operator[](i)=='+') && exponent_found && !exponent_values_found && !sign_found) {
			sign_found=true;
		} else
			return false; // no start with number plz

	}

	return numbers_found;

}

String String::path_to_file(const String& p_path) const {

	String src=this->replace("\\","/").get_base_dir();
	String dst=p_path.replace("\\","/").get_base_dir();
	String rel = src.path_to(dst);
	if (rel==dst) // failed
		return p_path;
	else
		return rel+p_path.get_file();
}

String String::path_to(const String& p_path) const {

	String src=this->replace("\\","/");
	String dst=p_path.replace("\\","/");
	if (!src.ends_with("/"))
		src+="/";
	if (!dst.ends_with("/"))
		dst+="/";


	String base;

	if (src.begins_with("res://") && dst.begins_with("res://")) {

		base="res:/";
		src=src.replace("res://","/");
		dst=dst.replace("res://","/");

	} else if (src.begins_with("user://") && dst.begins_with("user://")) {

		base="user:/";
		src=src.replace("user://","/");
		dst=dst.replace("user://","/");

	} else if (src.begins_with("/") && dst.begins_with("/")) {

		//nothing
	} else {
		//dos style
		String src_begin=src.get_slicec('/',0);
		String dst_begin=dst.get_slicec('/',0);

		if (src_begin!=dst_begin)
			return p_path; //impossible to do this

		base=src_begin;
		src=src.substr(src_begin.length(),src.length());
		dst=dst.substr(dst_begin.length(),dst.length());
	}

	//remove leading and trailing slash and split
	Vector<String> src_dirs=src.substr(1,src.length()-2).split("/");
	Vector<String> dst_dirs=dst.substr(1,dst.length()-2).split("/");

	//find common parent
	int common_parent=0;

	while(true) {
		if (src_dirs.size()==common_parent)
			break;
		if (dst_dirs.size()==common_parent)
			break;
		if (src_dirs[common_parent]!=dst_dirs[common_parent])
			break;
		common_parent++;
	}

	common_parent--;

	String dir;

	for(int i=src_dirs.size()-1;i>common_parent;i--) {

		dir+="../";
	}

	for(int i=common_parent+1;i<dst_dirs.size();i++) {

		dir+=dst_dirs[i]+"/";
	}

	if (dir.length()==0)
		dir="./";
	return dir;
}

bool String::is_valid_html_color() const {

	return Color::html_is_valid(*this);

}

bool String::is_valid_ip_address() const {

	Vector<String> ip = split(".");
	if (ip.size()!=4)
		return false;
	for(int i=0;i<ip.size();i++) {

		String n = ip[i];
		if (!n.is_valid_integer())
			return false;
		int val = n.to_int();
		if (val<0 || val>255)
			return false;
	}

	return true;
}

bool String::is_resource_file() const {

	return begins_with("res://") && find("::")==-1;
}

bool String::is_rel_path() const {

	return !is_abs_path();
}

String String::get_base_dir() const {

	int basepos = find("://");
	String rs;
	String base;
	if (basepos!=-1) {
		int end = basepos+3;
		rs = substr(end,length());
		base = substr(0,end);
	} else {
		if (begins_with("/")) {
			rs=substr(1,length());
			base="/";
		} else {

			rs=*this;
		}
	}

	int sep = MAX( rs.find_last("/"), rs.find_last("\\") );
	if (sep==-1)
		return base;

	return base+rs.substr(0,sep);

}

String String::get_file() const {

	int sep = MAX( find_last("/"), find_last("\\") );
	if (sep==-1)
		return *this;

	return substr(sep+1,length());
}

String String::extension() const {

	int pos = find_last(".");
	if (pos<0)
		return *this;

	return substr( pos+1, length() );
}

String String::plus_file(const String& p_file) const {

	if (length()>0 && operator [](length()-1)=='/')
		return *this+p_file;
	else
		return *this+"/"+p_file;
}

String String::percent_encode() const {

	CharString cs = utf8();
	String encoded;
	for(int i=0;i<cs.length();i++) {
		uint8_t c = cs[i];
		if ( (c>='A' && c<='Z') || (c>='a' && c<='z') || (c>='0' && c<='9') || c=='-' || c=='_' || c=='~' || c=='.') {

			char p[2]={(char)c,0};
			encoded+=p;
		} else {
			char p[4]={'%',0,0,0};
			static const char hex[16]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

			p[1]=hex[c>>4];
			p[2]=hex[c&0xF];
			encoded+=p;
		}
	}

	return encoded;
}
String String::percent_decode() const {

	CharString pe;

	CharString cs = utf8();
	for(int i=0;i<cs.length();i++) {

		uint8_t c = cs[i];
		if (c=='%' && i<length()-2) {

			uint8_t a = LOWERCASE(cs[i+1]);
			uint8_t b = LOWERCASE(cs[i+2]);

			c=0;
			if (a>='0' && a<='9')
				c=(a-'0')<<4;
			else if (a>='a' && a<='f')
				c=(a-'a'+10)<<4;
			else
				continue;

			uint8_t d=0;

			if (b>='0' && b<='9')
				d=(b-'0');
			else if (b>='a' && b<='f')
				d=(b-'a'+10);
			else
				continue;
			c+=d;
			i+=2;
		}
		pe.push_back(c);
	}

	pe.push_back(0);

	return String::utf8(pe.ptr());
}

String String::basename() const {

	int pos = find_last(".");
	if (pos<0)
		return *this;

	return substr( 0, pos );
}

String itos(int64_t p_val) {

	return String::num_int64(p_val);
}

String rtos(double p_val) {

	return String::num(p_val);
}

String rtoss(double p_val) {

	return String::num_scientific(p_val);
}

// Right-pad with a character.
String String::rpad(int min_length, const String& character) const {
	String s = *this;
	int padding = min_length - s.length();
	if (padding > 0) {
		for (int i = 0; i < padding; i++) s = s + character;
	}

	return s;
}
// Left-pad with a character.
String String::lpad(int min_length, const String& character) const {
	String s = *this;
	int padding = min_length - s.length();
	if (padding > 0) {
		for (int i = 0; i < padding; i++) s = character + s;
	}

	return s;
}

// sprintf is implemented in GDScript via:
//   "fish %s pie" % "frog"
//   "fish %s %d pie" % ["frog", 12]
// In case of an error, the string returned is the error description and "error" is true.
String String::sprintf(const Array& values, bool* error) const {
	String formatted;
	CharType* self = (CharType*)c_str();
	bool in_format = false;
	int value_index = 0;
	int min_chars;
	int min_decimals;
	bool in_decimals;
	bool pad_with_zeroes;
	bool left_justified;
	bool show_sign;

	*error = true;

	for (; *self; self++) {
		const CharType c = *self;

		if (in_format) { // We have % - lets see what else we get.
			switch (c) {
				case '%': { // Replace %% with %
					formatted += chr(c);
					in_format = false;
					break;
				}
				case 'd': // Integer (signed)
				case 'o': // Octal
				case 'x': // Hexadecimal (lowercase)
				case 'X': { // Hexadecimal (uppercase)
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "a number is required";
					}

					int64_t value = values[value_index];
					int base;
					bool capitalize = false;
					switch (c) {
						case 'd': base = 10; break;
						case 'o': base = 8; break;
						case 'x': base = 16; break;
						case 'X': base = 16; capitalize = true; break;
					}
					// Get basic number.
					String str = String::num_int64(value, base, capitalize);

					// Sign.
					if (show_sign && value >= 0) {
						str = str.insert(0, "+");
					}

					// Padding.
					String pad_char = pad_with_zeroes ? String("0") : String(" ");
					if (left_justified) {
						str = str.rpad(min_chars, pad_char);
					} else {
						str = str.lpad(min_chars, pad_char);
					}

					formatted += str;
					++value_index;
					in_format = false;

					break;
				}
				case 'f': { // Float
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "a number is required";
					}

					double value = values[value_index];
					String str = String::num(value, min_decimals);

					// Pad decimals out.
					str = str.pad_decimals(min_decimals);

					// Show sign
					if (show_sign && value >= 0) {
						str = str.insert(0, "+");
					}

					// Padding
					if (left_justified) {
						str = str.rpad(min_chars);
					} else {
						str = str.lpad(min_chars);
					}

					formatted += str;
					++value_index;
					in_format = false;

					break;
				}
				case 's': { // String
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					String str = values[value_index];
					// Padding.
					if (left_justified) {
						str = str.rpad(min_chars);
					} else {
						str = str.lpad(min_chars);
					}

					formatted += str;
					++value_index;
					in_format = false;
					break;
				}
				case 'c': {
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					// Convert to character.
					String str;
					if (values[value_index].is_num()) {
						int value = values[value_index];
						if (value < 0) {
							return "unsigned byte integer is lower than maximum";
						} else if (value > 255) {
							return "unsigned byte integer is greater than maximum";
						}
						str = chr(values[value_index]);
					} else if (values[value_index].get_type() == Variant::STRING) {
						str = values[value_index];
						if (str.length() != 1) {
							return "%c requires number or single-character string";
						}
					} else {
						return "%c requires number or single-character string";
					}

					// Padding.
					if (left_justified) {
						str = str.rpad(min_chars);
					} else {
						str = str.lpad(min_chars);
					}

					formatted += str;
					++value_index;
					in_format = false;
					break;
				}
				case '-': { // Left justify
					left_justified = true;
					break;
				}
				case '+': { // Show + if positive.
					show_sign = true;
					break;
				}
				case '0': case '1': case '2': case '3': case '4':
				case '5': case '6': case '7': case '8': case '9': {
					int n = c - '0';
					if (in_decimals) {
						min_decimals *= 10;
						min_decimals += n;
					} else {
						if (c == '0' && min_chars == 0) {
							pad_with_zeroes = true;
						} else {
							min_chars *= 10;
							min_chars += n;
						}
					}
					break;
				}
				case '.': { // Float separtor.
					if (in_decimals) {
						return "too many decimal points in format";
					}
					in_decimals = true;
					min_decimals = 0; // We want to add the value manually.
					break;
				}

				case '*': { // Dyanmic width, based on value.
					if (value_index >= values.size()) {
						return "not enough arguments for format string";
					}

					if (!values[value_index].is_num()) {
						return "* wants number";
					}

					int size = values[value_index];

					if (in_decimals) {
						min_decimals = size;
					} else {
						min_chars = size;
					}

					++value_index;
					break;
				}

				default: {
					return "unsupported format character";
  				}
			}
		} else { // Not in format string.
			switch (c) {
				case '%':
					in_format = true;
					// Back to defaults:
					min_chars = 0;
					min_decimals = 6;
					pad_with_zeroes = false;
					left_justified = false;
					show_sign = false;
					in_decimals = false;
					break;
				default:
					formatted += chr(c);
			}
		}
	}

	if (in_format) {
		return "incomplete format";
	}

	if (value_index != values.size()) {
		return "not all arguments converted during string formatting";
	}

	*error = false;
	return formatted;
}

#include "translation.h"

#ifdef TOOLS_ENABLED
String TTR(const String& p_text) {

	if (TranslationServer::get_singleton()) {
		return TranslationServer::get_singleton()->tool_translate(p_text);
	}

	return p_text;
}

#endif

String RTR(const String& p_text) {



	if (TranslationServer::get_singleton()) {
		String rtr = TranslationServer::get_singleton()->tool_translate(p_text);
		if (rtr==String() || rtr==p_text) {
			return TranslationServer::get_singleton()->translate(p_text);
		} else {
			return rtr;
		}
	}

	return p_text;
}