minetest/src/util/string.h

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/*
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Minetest
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Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef UTIL_STRING_HEADER
#define UTIL_STRING_HEADER
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#include "irrlichttypes_bloated.h"
#include <stdlib.h>
#include <string>
#include <cstring>
#include <vector>
#include <sstream>
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#include <cctype>
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#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
struct FlagDesc {
const char *name;
u32 flag;
};
std::wstring narrow_to_wide(const std::string& mbs);
std::string wide_to_narrow(const std::wstring& wcs);
std::string translatePassword(std::string playername, std::wstring password);
std::string urlencode(std::string str);
std::string urldecode(std::string str);
u32 readFlagString(std::string str, const FlagDesc *flagdesc, u32 *flagmask);
std::string writeFlagString(u32 flags, const FlagDesc *flagdesc, u32 flagmask);
size_t mystrlcpy(char *dst, const char *src, size_t size);
char *mystrtok_r(char *s, const char *sep, char **lasts);
u64 read_seed(const char *str);
bool parseColorString(const std::string &value, video::SColor &color, bool quiet);
/**
* Returns a copy of s with spaces inserted at the right hand side to ensure
* that the string is len characters in length. If s is <= len then the
* returned string will be identical to s.
*/
static inline std::string padStringRight(std::string s, size_t len)
{
if (len > s.size())
s.insert(s.end(), len - s.size(), ' ');
return s;
}
/**
* Returns a version of the string s with the first occurrence of a string
* contained within ends[] removed from the end of the string.
*
* @param s
* @param ends A NULL- or ""- terminated array of strings to remove from s in
* the copy produced. Note that once one of these strings is removed
* that no further postfixes contained within this array are removed.
*
* @return If no end could be removed then "" is returned
*/
static inline std::string removeStringEnd(const std::string &s, const char *ends[])
{
const char **p = ends;
for (; *p && (*p)[0] != '\0'; p++) {
std::string end = *p;
if(s.size() < end.size())
continue;
if(s.substr(s.size()-end.size(), end.size()) == end)
return s.substr(0, s.size() - end.size());
}
return "";
}
/**
* Check two wide strings for equivalence. If case_insensitive is true
* then the case of the strings are ignored (default is false).
*
* @param s1
* @param s2
* @param case_insensitive
* @return true if the strings match
*/
inline bool str_equal(const std::wstring &s1, const std::wstring &s2,
bool case_insensitive = false)
{
if (case_insensitive) {
if (s1.size() != s2.size())
return false;
for (size_t i = 0; i < s1.size(); ++i)
if(tolower(s1[i]) != tolower(s2[i]))
return false;
return true;
}
return s1 == s2;
}
/**
* Check whether str begins with the string prefix. If the argument
* case_insensitive == true then the check is case insensitve (default
* is false; i.e. case is significant).
*
* @param str
* @param prefix
* @param case_insensitive
* @return true if the str begins with prefix
*/
inline bool str_starts_with(const std::wstring &str, const std::wstring &prefix,
bool case_insensitive = false)
{
if (str.size() < prefix.size())
return false;
if (case_insensitive) {
for (size_t i = 0; i < prefix.size(); ++i)
if (tolower(str[i]) != tolower(prefix[i]))
return false;
} else {
for (size_t i = 0; i < prefix.size(); ++i)
if (str[i] != prefix[i])
return false;
}
return true;
}
/**
* Splits a string of wide characters into its component parts separated by
* the character delimiter.
*
* @return a std::vector<std::wstring> of the component parts
*/
inline std::vector<std::wstring> str_split(const std::wstring &str,
wchar_t delimiter)
{
std::vector<std::wstring> parts;
std::wstringstream sstr(str);
std::wstring part;
while (std::getline(sstr, part, delimiter))
parts.push_back(part);
return parts;
}
/**
* Splits a string into its component parts separated by the character
* delimiter.
*
* @return a std::vector<std::string> of the component parts
*/
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inline std::vector<std::string> str_split(const std::string &str, char delimiter) {
std::vector<std::string> parts;
std::stringstream sstr(str);
std::string part;
while (std::getline(sstr, part, delimiter))
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parts.push_back(part);
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return parts;
}
/**
* Return a copy of s converted to all lowercase characters
* @param s
*/
inline std::string lowercase(const std::string &s)
{
std::string s2;
s2.reserve(s.size());
for (size_t i = 0; i < s.size(); i++)
s2 += tolower(s[i]);
return s2;
}
/**
* Returns a copy of s with leading and trailing whitespace removed.
* @param s
*/
inline std::string trim(const std::string &s)
{
size_t front = 0;
while (std::isspace(s[front]))
++front;
size_t back = s.size();
while (back > front && std::isspace(s[back-1]))
--back;
return s.substr(front, back - front);
}
/**
* Returns true if s should be regarded as (bool) true. Leading and trailing
* whitespace are ignored; case is ignored. Values that will return
* true are "y", "n", "true" and any number that != 0.
* @param s
*/
inline bool is_yes(const std::string &s)
{
std::string s2 = lowercase(trim(s));
return s2 == "y" || s2 == "yes" || s2 == "true" || atoi(s2.c_str()) != 0;
}
/**
* Converts the string s to a signed 32-bit integer. The converted value is
* constrained so that min <= value <= max.
*
* @see atoi(3) for limitations
*
* @param s
* @param min Range minimum
* @param max Range maximum
* @return The value converted to a signed 32-bit integer and constrained
* within the range defined by min and max (inclusive)
*/
inline s32 mystoi(const std::string &s, s32 min, s32 max)
{
s32 i = atoi(s.c_str());
if (i < min)
i = min;
if (i > max)
i = max;
return i;
}
/**
* Returns a 64-bit value reprensented by the string s (decimal).
*/
inline s64 stoi64(const std::string &s)
{
std::stringstream tmp(s);
s64 t;
tmp >> t;
return t;
}
// MSVC2010 includes it's own versions of these
//#if !defined(_MSC_VER) || _MSC_VER < 1600
/**
* Returns a 32-bit value reprensented by the string s (decimal).
*
* @see atoi(3) for further limitations
*/
inline s32 mystoi(const std::string &s)
{
return atoi(s.c_str());
}
/**
* Returns a 32-bit value reprensented by the wide string s (decimal).
*
* @see atoi(3) for further limitations
*/
inline s32 mystoi(const std::wstring &s)
{
return atoi(wide_to_narrow(s).c_str());
}
/**
* Returns a float reprensented by the string s (decimal).
*
* @see atof(3)
*/
inline float mystof(const std::string &s)
{
// This crap causes a segfault in certain cases on MinGW
/*float f;
std::istringstream ss(s);
ss>>f;
return f;*/
// This works in that case
return atof(s.c_str());
}
//#endif
#define stoi mystoi
#define stof mystof
/**
* Returns a string representing the decimal value of the 32-bit value i
*/
inline std::string itos(s32 i)
{
std::ostringstream o;
o << i;
return o.str();
}
/**
* Returns a string representing the decimal value of i of the 64-bit value i
*/
inline std::string i64tos(s64 i) {
std::ostringstream o;
o << i;
return o.str();
}
/**
* Returns a string representing the real number (decimal) float value i
*/
inline std::string ftos(float f)
{
std::ostringstream o;
o << f;
return o.str();
}
/**
* Replace all occurrences of pattern in str with replacement
*
* @param str String to replace pattern with replacement within
* @param pattern The pattern to replace
* @param replacement What to replace the pattern with
*/
inline void str_replace(std::string &str, std::string const &pattern,
std::string const &replacement)
{
std::string::size_type start = str.find(pattern, 0);
while (start != str.npos) {
str.replace(start, pattern.size(), replacement);
start = str.find(pattern, start+replacement.size());
}
}
/**
* Replace all occurrances of the character from in str with to.
*
* @param str The string to (potentially) modify
* @param from The character in str to replace
* @param to The replacement character
*/
inline void str_replace_char(std::string &str, char from, char to)
{
for (size_t i = 0; i < str.size(); i++)
if (str[i] == from)
str[i] = to;
}
/**
* Check that a string only contains whitelisted characters. This is the
* opposite of string_allowed_blacklist().
*
* @param s The string to be checked.
* @param allowed_chars A string containing permitted characters.
* @return true if the string is allowed, otherwise false.
*
* @see string_allowed_blacklist()
*/
inline bool string_allowed(const std::string &s, const std::string &allowed_chars)
{
for (size_t i = 0; i < s.size(); i++)
if (allowed_chars.find(s[i]) == std::string::npos)
return false;
return true;
}
/**
* Check that a string contains no blacklisted characters. This is the
* opposite of string_allowed().
*
* @param s The string to be checked.
* @param blacklisted_chars A string containing prohibited characters.
* @return true if the string is allowed, otherwise false.
* @see string_allowed()
*/
inline bool string_allowed_blacklist(const std::string &s,
const std::string &blacklisted_chars)
{
for (size_t i = 0; i < s.size(); i++)
if (blacklisted_chars.find(s[i]) != std::string::npos)
return false;
return true;
}
/**
* Create a string based on 'from' where a newline is forcefully inserted every
* 'rowlen' characters.
*
* @note This function does not honour word wraps and blindy inserts a newline
* every rowlen characters whether it breaks a word or not. It is
* intended to be used, for example, showing paths in the GUI
*
* @param from The string to be wrapped into rows.
* @param rowlen The row length (in characters).
* @return A new string with the wrapping applied.
*/
inline std::string wrap_rows(const std::string &from, u32 rowlen)
{
std::string to;
for (size_t i = 0; i < from.size(); i++) {
if(i != 0 && i % rowlen == 0)
to += '\n';
to += from[i];
}
return to;
}
/**
* Removes all \\ from a string that had been escaped (FormSpec strings)
*
*/
inline std::string unescape_string(std::string &s)
{
std::string res;
for (size_t i = 0; i < s.length(); i++) {
if (s[i] == '\\')
i++;
res += s[i];
}
return res;
}
/**
* Checks that all characters in tocheck are a decimal digits
*
* @param tocheck
* @return true if tockcheck is not empty and all characters in tocheck are
* decimal digits, otherwise false
*/
inline bool is_number(const std::string &tocheck)
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{
for (size_t i = 0; i < tocheck.size(); i++)
if (!std::isdigit(tocheck[i]))
return false;
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return !tocheck.empty();
}
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/**
* Returns a C-string, either "true" or "false", corresponding to v
*
* @return If v == true, then "true" is returned, otherwise "false"
*/
inline const char *bool_to_cstr(bool v)
{
return v ? "true" : "false";
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}
#endif