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/*************************************************************************
** PageRanges.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2013 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 <sstream>
#include "InputBuffer.h"
#include "InputReader.h"
#include "PageRanges.h"
#include "macros.h"
using namespace std;
/** Analyzes a string describing a range sequence.
* Syntax: ([0-9]+(-[0-9]*)?)|(-[0-9]+)(,([0-9]+(-[0-9]*)?)|(-[0-9]+))*
* @param[in] str string to parse
* @param[in] max_page greatest allowed value
* @param[out] ranges the extracted range sequence
* @return true on success; false denotes a syntax error */
bool PageRanges::parse (string str, int max_page) {
StringInputBuffer ib(str);
BufferInputReader ir(ib);
while (ir) {
int first=1;
int last=max_page;
ir.skipSpace();
if (!isdigit(ir.peek()) && ir.peek() != '-')
return false;
if (isdigit(ir.peek()))
first = ir.getInt();
ir.skipSpace();
if (ir.peek() == '-') {
while (ir.peek() == '-')
ir.get();
ir.skipSpace();
if (isdigit(ir.peek()))
last = ir.getInt();
}
else
last = first;
ir.skipSpace();
if (ir.peek() == ',') {
ir.get();
if (ir.eof())
return false;
}
else if (!ir.eof())
return false;
if (first > last)
swap(first, last);
first = max(1, first);
last = max(first, last);
if (max_page > 0) {
first = min(first, max_page);
last = min(last, max_page);
}
insert(first, last);
}
return true;
}
/** Adds a page range to the range collection.
* @param[in] first first page of new range
* @param[in] last last page of new range */
void PageRanges::insert (int first, int last) {
if (first > last)
swap(first, last);
Container::iterator it = _ranges.begin();
while (it != _ranges.end() && first > it->first+1 && first > it->second+1)
++it;
if (it == _ranges.end() || last < it->first-1 || first > it->second+1)
it = _ranges.insert(it, Range(first, last));
else if ((first < it->first && last >= it->first-1) || (first <= it->second+1 && last > it->second)) {
it->first = min(it->first, first);
it->second = max(it->second, last);
}
// merge adjacent ranges
if (it != _ranges.end()) {
Container::iterator l = it;
Container::iterator r = it;
if (l == _ranges.begin())
l = _ranges.end();
else
--l;
++r;
bool l_modified = false;
bool r_modified = false;
if (l != _ranges.end() && l->second >= it->first-1) {
l->first = min(l->first, it->first);
l->second = max(l->second, it->second);
l_modified = true;
}
if (r != _ranges.end() && r->first <= it->second+1) {
r->first = min(r->first, it->first);
r->second = max(r->second, it->second);
r_modified = true;
}
if (l_modified || r_modified) {
_ranges.erase(it);
if (l_modified && r_modified && l->second >= r->first-1) {
l->first = min(l->first, r->first);
l->second = max(l->second, r->second);
_ranges.erase(r);
}
}
}
}
/** Returns the number of pages. */
size_t PageRanges::pages () const {
size_t sum=0;
for (ConstIterator it=_ranges.begin(); it != _ranges.end(); ++it)
sum += it->second - it->first + 1;
return sum;
}
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