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[device recorder] WIP on allowing to leverage timestamp or not
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src/plugins/score-plugin-avnd/AvndProcesses/Alphanum.hpp
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#pragma once | ||
/* | ||
Released under the MIT License - https://opensource.org/licenses/MIT | ||
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 <string_view> | ||
|
||
namespace doj | ||
{ | ||
struct alphanum_compare | ||
{ | ||
static constexpr bool alphanum_isdigit(const char c) noexcept | ||
{ | ||
return c >= '0' && c <= '9'; | ||
} | ||
/** | ||
compare l and r with strcmp() semantics, but using | ||
the "Alphanum Algorithm". This function is designed to read | ||
through the l and r strings only one time, for | ||
maximum performance. It does not allocate memory for | ||
substrings. It can either use the C-library functions isdigit() | ||
and atoi() to honour your locale settings, when recognizing | ||
digit characters when you "#define ALPHANUM_LOCALE=1" or use | ||
it's own digit character handling which only works with ASCII | ||
digit characters, but provides better performance. | ||
@param l NULL-terminated C-style string | ||
@param r NULL-terminated C-style string | ||
@return negative if l<r, 0 if l equals r, positive if l>r | ||
*/ | ||
static constexpr int impl(std::string_view ll, std::string_view rr) noexcept | ||
{ | ||
enum mode_t | ||
{ | ||
STRING, | ||
NUMBER | ||
} mode | ||
= STRING; | ||
|
||
const char* l = ll.data(); | ||
const char* r = rr.data(); | ||
while(l != ll.end() && r != rr.end() && *l && *r) | ||
{ | ||
if(mode == STRING) | ||
{ | ||
char l_char{}, r_char{}; | ||
while((l != ll.end() && r != rr.end()) && (l_char = *l) && (r_char = *r)) | ||
{ | ||
// check if this are digit characters | ||
const bool l_digit = alphanum_isdigit(l_char), | ||
r_digit = alphanum_isdigit(r_char); | ||
// if both characters are digits, we continue in NUMBER mode | ||
if(l_digit && r_digit) | ||
{ | ||
mode = NUMBER; | ||
break; | ||
} | ||
// if only the left character is a digit, we have a result | ||
if(l_digit) | ||
return -1; | ||
// if only the right character is a digit, we have a result | ||
if(r_digit) | ||
return +1; | ||
// compute the difference of both characters | ||
const int diff = l_char - r_char; | ||
// if they differ we have a result | ||
if(diff != 0) | ||
return diff; | ||
// otherwise process the next characters | ||
++l; | ||
++r; | ||
} | ||
} | ||
else // mode==NUMBER | ||
{ | ||
// get the left number | ||
unsigned long l_int = 0; | ||
while(l != ll.end() && *l && alphanum_isdigit(*l)) | ||
{ | ||
// TODO: this can overflow | ||
l_int = l_int * 10 + *l - '0'; | ||
++l; | ||
} | ||
|
||
// get the right number | ||
unsigned long r_int = 0; | ||
while(r != rr.end() && *r && alphanum_isdigit(*r)) | ||
{ | ||
// TODO: this can overflow | ||
r_int = r_int * 10 + *r - '0'; | ||
++r; | ||
} | ||
|
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// if the difference is not equal to zero, we have a comparison result | ||
const long diff = l_int - r_int; | ||
if(diff != 0) | ||
return diff; | ||
|
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// otherwise we process the next substring in STRING mode | ||
mode = STRING; | ||
} | ||
} | ||
|
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if(*r) | ||
return -1; | ||
if(*l) | ||
return +1; | ||
return 0; | ||
} | ||
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constexpr bool operator()(std::string_view l, std::string_view r) const noexcept | ||
{ | ||
return impl(l.data(), r.data()) < 0; | ||
} | ||
}; | ||
} |
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