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/*************************************************************************
** SVGOutput.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2015 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 <cmath>
#include <iomanip>
#include <iostream>
#include <sstream>
#include "gzstream.h"
#include "Calculator.h"
#include "FileSystem.h"
#include "Message.h"
#include "SVGOutput.h"
using namespace std;
SVGOutput::SVGOutput (const char *base, string pattern, int zipLevel)
: _path(base ? base : ""),
_pattern(pattern),
_stdout(base == 0),
_zipLevel(zipLevel),
_page(-1),
_os(0)
{
}
/** Returns an output stream for the given page.
* @param[in] page number of current page
* @param[in] numPages total number of pages in the DVI file
* @return output stream for the given page */
ostream& SVGOutput::getPageStream (int page, int numPages) const {
string fname = filename(page, numPages);
if (fname.empty()) {
delete _os;
_os = 0;
return cout;
}
if (page == _page)
return *_os;
_page = page;
delete _os;
if (_zipLevel > 0)
_os = new ogzstream(fname.c_str(), _zipLevel);
else
_os = new ofstream(fname.c_str());
if (!_os || !*_os) {
delete _os;
_os = 0;
throw MessageException("can't open file "+fname+" for writing");
}
return *_os;
}
/** Returns the name of the SVG file containing the given page.
* @param[in] page number of current page
* @param[in] numPages total number of pages */
string SVGOutput::filename (int page, int numPages) const {
if (_stdout)
return "";
string pattern = _pattern;
expandFormatString(pattern, page, numPages);
// remove leading and trailing whitespace
stringstream trim;
trim << pattern;
pattern.clear();
trim >> pattern;
// set and expand default pattern if necessary
if (pattern.empty()) {
pattern = numPages > 1 ? "%f-%p" : "%f";
expandFormatString(pattern, page, numPages);
}
// append suffix if necessary
FilePath outpath(pattern, true);
if (outpath.suffix().empty())
outpath.suffix(_zipLevel > 0 ? "svgz" : "svg");
string abspath = outpath.absolute();
string relpath = outpath.relative();
return abspath.length() < relpath.length() ? abspath : relpath;
}
static int ilog10 (int n) {
int result = 0;
while (n >= 10) {
result++;
n /= 10;
}
return result;
}
/** Replace expressions in a given string by the corresponing values.
* Supported constructs:
* %f: basename of the current file (filename without suffix)
* %[0-9]?p: current page number
* %[0-9]?P: number of pages in DVI file
* %[0-9]?(expr): arithmetic expression */
void SVGOutput::expandFormatString (string &str, int page, int numPages) const {
string result;
while (!str.empty()) {
size_t pos = str.find('%');
if (pos == string::npos) {
result += str;
str.clear();
}
else {
result += str.substr(0, pos);
str = str.substr(pos);
pos = 1;
ostringstream oss;
if (isdigit(str[pos])) {
oss << setw(str[pos]-'0') << setfill('0');
pos++;
}
else {
oss << setw(ilog10(numPages)+1) << setfill('0');
}
switch (str[pos]) {
case 'f':
result += _path.basename();
break;
case 'p':
case 'P':
oss << (str[pos] == 'p' ? page : numPages);
result += oss.str();
break;
case '(': {
size_t endpos = str.find(')', pos);
if (endpos == string::npos)
throw MessageException("missing ')' in filename pattern");
else if (endpos-pos-1 > 1) {
try {
Calculator calculator;
calculator.setVariable("p", page);
calculator.setVariable("P", numPages);
oss << floor(calculator.eval(str.substr(pos, endpos-pos+1)));
result += oss.str();
}
catch (CalculatorException &e) {
oss.str("");
oss << "error in filename pattern (" << e.what() << ")";
throw MessageException(oss.str());
}
pos = endpos;
}
break;
}
}
str = str.substr(pos+1);
}
}
str = result;
}
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