1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#include "math_parser_func.h"
#include <exception>
#include <string_view>
#include <vector>
std::vector<std::string_view> tokenize( std::string_view str, std::string_view separators,
bool include_seps )
{
std::vector<std::string_view> ret;
std::string_view::size_type start = 0;
std::string_view::size_type pos = 0;
std::string_view last;
while( pos != std::string_view::npos ) {
pos = str.find_first_of( separators, start );
if( pos != start ) {
std::string_view const ts = str.substr( start, pos - start );
if( std::string_view::size_type const unpad = ts.find_first_not_of( ' ' );
unpad != std::string_view::npos ) {
std::string_view::size_type const unpad_e = ts.find_last_not_of( ' ' );
ret.emplace_back(
ts.substr( unpad, unpad_e - unpad + 1 ) );
}
}
if( pos != std::string_view::npos && include_seps ) {
if( str[pos] == '=' && start > 0 &&
( last == "=" || last == ">" || last == "<" || last == "!" ) ) {
ret.pop_back();
ret.emplace_back( str.substr( pos - 1, 2 ) );
} else {
ret.emplace_back( &str[pos], 1 );
}
}
if( !ret.empty() ) {
last = ret.back();
}
start = pos + 1;
}
return ret;
}
|
