1 /*
2 Minetest
3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #include "metadata.h"
21 #include "log.h"
22
23 /*
24 Metadata
25 */
26
clear()27 void Metadata::clear()
28 {
29 m_stringvars.clear();
30 m_modified = true;
31 }
32
empty() const33 bool Metadata::empty() const
34 {
35 return m_stringvars.empty();
36 }
37
size() const38 size_t Metadata::size() const
39 {
40 return m_stringvars.size();
41 }
42
contains(const std::string & name) const43 bool Metadata::contains(const std::string &name) const
44 {
45 return m_stringvars.find(name) != m_stringvars.end();
46 }
47
operator ==(const Metadata & other) const48 bool Metadata::operator==(const Metadata &other) const
49 {
50 if (size() != other.size())
51 return false;
52
53 for (const auto &sv : m_stringvars) {
54 if (!other.contains(sv.first) || other.getString(sv.first) != sv.second)
55 return false;
56 }
57
58 return true;
59 }
60
getString(const std::string & name,u16 recursion) const61 const std::string &Metadata::getString(const std::string &name, u16 recursion) const
62 {
63 StringMap::const_iterator it = m_stringvars.find(name);
64 if (it == m_stringvars.end()) {
65 static const std::string empty_string = std::string("");
66 return empty_string;
67 }
68
69 return resolveString(it->second, recursion);
70 }
71
getStringToRef(const std::string & name,std::string & str,u16 recursion) const72 bool Metadata::getStringToRef(
73 const std::string &name, std::string &str, u16 recursion) const
74 {
75 StringMap::const_iterator it = m_stringvars.find(name);
76 if (it == m_stringvars.end()) {
77 return false;
78 }
79
80 str = resolveString(it->second, recursion);
81 return true;
82 }
83
84 /**
85 * Sets var to name key in the metadata storage
86 *
87 * @param name
88 * @param var
89 * @return true if key-value pair is created or changed
90 */
setString(const std::string & name,const std::string & var)91 bool Metadata::setString(const std::string &name, const std::string &var)
92 {
93 if (var.empty()) {
94 m_stringvars.erase(name);
95 return true;
96 }
97
98 StringMap::iterator it = m_stringvars.find(name);
99 if (it != m_stringvars.end() && it->second == var) {
100 return false;
101 }
102
103 m_stringvars[name] = var;
104 m_modified = true;
105 return true;
106 }
107
resolveString(const std::string & str,u16 recursion) const108 const std::string &Metadata::resolveString(const std::string &str, u16 recursion) const
109 {
110 if (recursion <= 1 && str.substr(0, 2) == "${" && str[str.length() - 1] == '}') {
111 return getString(str.substr(2, str.length() - 3), recursion + 1);
112 }
113
114 return str;
115 }
116