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/*************************************************************************
** utility.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2018 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program 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. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <algorithm>
#include <cctype>
#include <fstream>
#include <functional>
#include <iterator>
#include "utility.hpp"
using namespace std;
/** Returns a given string with leading and trailing whitespace removed.
* @param[in] str the string to process
* @param[in] ws characters treated as whitespace
* @return the trimmed string */
string util::trim (const std::string &str, const char *ws) {
size_t first = str.find_first_not_of(ws);
if (first == string::npos)
return "";
size_t last = str.find_last_not_of(ws);
return str.substr(first, last-first+1);
}
/** Removes leading and trailing whitespace from a given string, and replaces
* all other whitespace sequences by single spaces.
* @param[in] str the string to process
* @param[in] ws characters treated as whitespace
* @return the normalized string */
string util::normalize_space (string str, const char *ws) {
str = trim(str);
size_t first = str.find_first_of(ws);
while (first != string::npos) {
size_t last = str.find_first_not_of(ws, first);
str.replace(first, last-first, " ");
first = str.find_first_of(ws, first+1);
}
return str;
}
/** Replaces all occurences of a substring with another string.
* @param[in] str string to search through
* @param[in] find string to look for
* @param[in] repl replacement for "find"
* @return the resulting string */
string util::replace (string str, const string &find, const string &repl) {
if (!find.empty() && !repl.empty()) {
size_t first = str.find(find);
while (first != string::npos) {
str.replace(first, find.length(), repl);
first = str.find(find, first+repl.length());
}
}
return str;
}
/** Splits a string at all occurences of a given separator string and
* returns the substrings.
* @param[in] str string to split
* @param[in] sep separator to look for
* @return the substrings between the separators */
vector<string> util::split (const string &str, const string &sep) {
vector<string> parts;
if (str.empty() || sep.empty())
parts.emplace_back(str);
else {
size_t left=0;
while (left <= str.length()) {
size_t right = str.find(sep, left);
if (right == string::npos) {
parts.emplace_back(str.substr(left));
left = string::npos;
}
else {
parts.emplace_back(str.substr(left, right-left));
left = right+sep.length();
}
}
}
return parts;
}
string util::tolower (const string &str) {
string ret=str;
transform(str.begin(), str.end(), ret.begin(), ::tolower);
return ret;
}
/** Returns the integer part of log10 of a given integer \f$n>0\f$.
* If \f$n<0\f$, the result is 0. */
int util::ilog10 (int n) {
int result = 0;
while (n >= 10) {
result++;
n /= 10;
}
return result;
}
/** Returns the contents of a file.
* @param[in] fname name/path of the file */
string util::read_file_contents (const string &fname) {
ifstream ifs(fname.c_str(), ios::binary);
return string(istreambuf_iterator<char>(ifs.rdbuf()), istreambuf_iterator<char>());
}
/** Writes a sequence of bytes given as a string to a file.
* @param[in] name/path of the file to write
* @param[in] start iterator pointing to the begin of the byte sequence
* @param[in] end iterator pointing to the first byte after the byte sequence to write */
void util::write_file_contents (const string &fname, string::iterator start, string::iterator end) {
ofstream ofs(fname.c_str(), ios::binary);
copy(start, end, ostream_iterator<char>(ofs));
}
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