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/*
* Utility functions
*
* (c) 2015 Schrodinger, Inc.
*/
#include <cstdio>
#include <cctype>
#include <sstream>
#include <string>
#include <vector>
#include "Util2.h"
/*
* strsplit: split string `s` by character `delim`
*
* If `delim` is null, then do whitespace split.
*/
std::vector<std::string> strsplit(const std::string &s, char delim) {
std::vector<std::string> elems;
std::istringstream iss(s);
std::string item;
if (delim) {
// token split
while (std::getline(iss, item, delim))
elems.push_back(item);
} else {
// whitespace split
while (iss >> item)
elems.push_back(item);
}
return elems;
}
/*
* Natural string compare: F1 < F2 < F10
*
* Return true if a < b
*/
bool cstrlessnat(const char * a, const char * b) {
if (!b[0])
return false;
if (!a[0])
return true;
bool a_digit = isdigit(a[0]);
bool b_digit = isdigit(b[0]);
if (a_digit && !b_digit)
return true;
if (!a_digit && b_digit)
return false;
if (!a_digit && !b_digit) {
if (a[0] != b[0])
return (a[0] < b[0]);
return cstrlessnat(a + 1, b + 1);
}
int ia, ib, na, nb;
sscanf(a, "%d%n", &ia, &na);
sscanf(b, "%d%n", &ib, &nb);
if (ia != ib)
return ia < ib;
return cstrlessnat(a + na, b + nb);
}
/*
* Natural string compare: F1 < F2 < F10
*/
bool strlessnat(const std::string& a, const std::string& b) {
return cstrlessnat(a.c_str(), b.c_str());
}
/*
* Return true if s starts with the specified prefix, false otherwise.
*/
bool p_strstartswith(const char * s, const char * prefix) {
while (*prefix)
if (*s++ != *prefix++)
return false;
return true;
}
/*
* case-insensitive version of p_strstartswith
*/
bool p_strcasestartswith(const char * s, const char * prefix) {
for (; *prefix; ++s, ++prefix)
if (*s != *prefix && tolower(*s) != tolower(*prefix))
return false;
return true;
}
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