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/*
* Copyright (c) 2008-2018 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at http://mozilla.org/MPL/2.0/
*
* MRtrix3 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.
*
* For more details, see http://www.mrtrix.org/
*/
#include "mrtrix.h"
namespace MR
{
/************************************************************************
* Miscellaneous functions *
************************************************************************/
vector<default_type> parse_floats (const std::string& spec)
{
vector<default_type> V;
if (!spec.size()) throw Exception ("floating-point sequence specifier is empty");
std::string::size_type start = 0, end;
default_type range_spec[3];
int i = 0;
try {
do {
end = spec.find_first_of (",:", start);
std::string sub (spec.substr (start, end-start));
range_spec[i] = (sub.empty() || sub == "nan") ? NAN : to<default_type> (sub);
char last_char = end < spec.size() ? spec[end] : '\0';
if (last_char == ':') {
i++;
if (i > 2) throw Exception ("invalid number range in number sequence \"" + spec + "\"");
} else {
if (i) {
if (i != 2)
throw Exception ("For floating-point ranges, must specify three numbers (start:step:end)");
default_type first = range_spec[0], inc = range_spec[1], last = range_spec[2];
if (!inc || (inc * (last-first) < 0.0) || !std::isfinite(first) || !std::isfinite(inc) || !std::isfinite(last))
throw Exception ("Floating-point range does not form a finite set");
default_type value = first;
for (size_t mult = 0; (inc>0.0f ? value < last - 0.5f*inc : value > last + 0.5f*inc); ++mult)
V.push_back ((value = first + (mult * inc)));
} else {
V.push_back (range_spec[0]);
}
i = 0;
}
start = end+1;
} while (end < spec.size());
}
catch (Exception& E) {
throw Exception (E, "can't parse floating-point sequence specifier \"" + spec + "\"");
}
return (V);
}
vector<int> parse_ints (const std::string& spec, int last)
{
vector<int> V;
if (!spec.size()) throw Exception ("integer sequence specifier is empty");
std::string::size_type start = 0, end;
int num[3];
int i = 0;
try {
do {
end = spec.find_first_of (",:", start);
std::string token (strip (spec.substr (start, end-start)));
if (lowercase (token) == "end") {
if (last == std::numeric_limits<int>::max())
throw Exception ("value of \"end\" is not known in number sequence \"" + spec + "\"");
num[i] = last;
}
else num[i] = to<int> (spec.substr (start, end-start));
char last_char = end < spec.size() ? spec[end] : '\0';
if (last_char == ':') {
i++;
if (i > 2) throw Exception ("invalid number range in number sequence \"" + spec + "\"");
}
else {
if (i) {
int inc, last;
if (i == 2) {
inc = num[1];
last = num[2];
}
else {
inc = 1;
last = num[1];
}
if (inc * (last - num[0]) < 0) inc = -inc;
for (; (inc > 0 ? num[0] <= last : num[0] >= last) ; num[0] += inc) V.push_back (num[0]);
}
else V.push_back (num[0]);
i = 0;
}
start = end+1;
}
while (end < spec.size());
}
catch (Exception& E) {
throw Exception (E, "can't parse integer sequence specifier \"" + spec + "\"");
}
return (V);
}
vector<std::string> split (const std::string& string, const char* delimiters, bool ignore_empty_fields, size_t num)
{
vector<std::string> V;
if (!string.size())
return V;
std::string::size_type start = 0, end;
try {
if (ignore_empty_fields)
start = string.find_first_not_of (delimiters);
do {
end = string.find_first_of (delimiters, start);
V.push_back (string.substr (start, end-start));
if (end >= string.size()) break;
start = ignore_empty_fields ? string.find_first_not_of (delimiters, end+1) : end+1;
if (start > string.size()) break;
if (V.size()+1 >= num) {
V.push_back (string.substr (start));
break;
}
} while (true);
}
catch (...) {
throw Exception ("can't split string \"" + string + "\"");
}
return V;
}
}
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