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Multisplit: Difference between revisions
Added C++23 version
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"" ( split with "!=" at index 7 )
"c" ( split with "" at index 10 )
</pre>
===C++23===
<syntaxhighlight lang="c++">
/* multisplit.cpp */
#include <features.h>
#include <iostream>
#include <string>
#include <vector>
#include <format>
/* C++23 example for Multisplit 6 Jan 2024
email:
spikeysnack@gmail.com
compile:
g++-13 -std=c++23 -Wall -o multisplit multisplit.cpp
*/
// extra info
#define _EXTRA
// aliases
using std::string;
using std::vector;
using str_vec = vector<string>;
using std::cout;
// constants
constexpr static const size_t npos = -1;
// function signatures
string replace_all(string& str, string& remove, string& insert );
str_vec split_on_delim(string& str, const string& delims);
str_vec Multisplit( string& input, const str_vec& seps);
// functions
// replace all substrings in string
// a = "dogs and cats and dogs and cats and birds"
// replace(a, "cats" , "fish");
// ==> "dogs and fish and dogs and fish and birds"
string replace_all(string& str,
const string& remove,
const string& insert ){
string s{str};
string::size_type pos = 0;
#ifdef _EXTRA
const string rightarrow{"\u2B62"}; //unicode arrow
auto ex = std::format("match: {}\t{} ", remove, rightarrow);
std::cerr << ex;
#endif
while ((pos = s.find(remove, pos)) != npos){
s.replace(pos, remove.size(), insert);
pos++;
}
return s;
}
// create a string vector from a string,
// split on a delimiter string
// x = "ab:cde:fgh:ijk"
// split_on_delim( x, ":");
// ==> { "ab", "cde", "fgh", "ijk" }
str_vec split_on_delim(string& str, const string& delims) {
string::size_type beg, pos = 0;
str_vec sv;
string tmp;
while ( (beg = str.find_first_not_of(delims, pos)) != npos ){
pos = str.find_first_of(delims, beg + 1);
tmp = { str.substr(beg, pos - beg) };
sv.push_back(tmp);
}
return sv;
}
str_vec Multisplit( string& input, const str_vec& seps) {
string s1{input};
str_vec sv;
for( auto sep : seps){
s1 = replace_all(s1, sep, "^"); // space sep
#ifdef _EXTRA
std::cerr << s1 << "\n";
#endif
sv = split_on_delim(s1, "^"); // split
}
return sv;
}
/* main program */
int main(){
string sample{"a!===b=!=c"};
const str_vec seps {"!=", "==", "="};
auto s = std::format("sample: \t{}\n", sample);
cout << s;
auto sv = Multisplit(sample, seps);
for( auto s : sv){
auto out = std::format( "{}\t" , s);
cout << out;
}
cout << "\n";
return 0;
}
// end
</syntaxhighlight>
{{ out }}
<pre>
sample: a!===b=!=c
match: != ⭢ a^==b=^c
match: == ⭢ a^^b=^c
match: = ⭢ a^^b^^c
a b c
</pre>
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