summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvisvgm/dvisvgm-1.9.2/src/SVGOutput.cpp
blob: 26621d493033ef840a40683f619fb3ae60702a96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*************************************************************************
** 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;
}