Libosmium: include/osmium/tags/tags_filter.hpp Source File

Libosmium Fast and flexible C++ library for working with OpenStreetMap data

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tags_filter.hpp
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1#ifndef OSMIUM_TAGS_TAGS_FILTER_HPP
2#define OSMIUM_TAGS_TAGS_FILTER_HPP
3
4/*
5
6This file is part of Osmium (https://osmcode.org/libosmium).
7
8Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
9
10Boost Software License - Version 1.0 - August 17th, 2003
11
12Permission is hereby granted, free of charge, to any person or organization
13obtaining a copy of the software and accompanying documentation covered by
14this license (the "Software") to use, reproduce, display, distribute,
15execute, and transmit the Software, and to prepare derivative works of the
16Software, and to permit third-parties to whom the Software is furnished to
17do so, all subject to the following:
18
19The copyright notices in the Software and this entire statement, including
20the above license grant, this restriction and the following disclaimer,
21must be included in all copies of the Software, in whole or in part, and
22all derivative works of the Software, unless such copies or derivative
23works are solely in the form of machine-executable object code generated by
24a source language processor.
25
26THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32DEALINGS IN THE SOFTWARE.
33
34*/
35
36#include <osmium/osm/tag.hpp>
37#include <osmium/tags/matcher.hpp>
38
39#include <utility>
40#include <vector>
41
42namespace osmium {
43
65 template <typename TResult>
66 class TagsFilterBase {
67
68 std::vector<std::pair<TResult, TagMatcher>> m_rules;
69 TResult m_default_result;
70
71 public:
72
73 using iterator = osmium::memory::CollectionFilterIterator<TagsFilterBase, const osmium::Tag>;
74
81 explicit TagsFilterBase(const TResult default_result = TResult{}) :
82 m_default_result(default_result) {
83 }
84
89 void set_default_result(const TResult default_result) noexcept {
90 m_default_result = default_result;
91 }
92
100 TagsFilterBase& add_rule(const TResult result, const TagMatcher& matcher) {
101 m_rules.emplace_back(result, matcher);
102 return *this;
103 }
104
113 template <typename... TArgs>
114 TagsFilterBase& add_rule(const TResult result, TArgs&&... args) {
115 m_rules.emplace_back(result, osmium::TagMatcher{std::forward<TArgs>(args)...});
116 return *this;
117 }
118
126 TResult operator()(const osmium::Tag& tag) const noexcept {
127 for (const auto& rule : m_rules) {
128 if (rule.second(tag)) {
129 return rule.first;
130 }
131 }
132 return m_default_result;
133 }
134
140 std::size_t count() const noexcept {
141 return m_rules.size();
142 }
143
149 bool empty() const noexcept {
150 return m_rules.empty();
151 }
152
153 }; // class TagsFilterBase
154
155 using TagsFilter = TagsFilterBase<bool>;
156
162 inline bool compare_tags(osmium::TagList const &tags1,
163 osmium::TagList const &tags2,
164 TagsFilter const &filter)
165 {
166 auto const end1 = tags1.cend();
167 auto const end2 = tags2.cend();
168
169 auto it1 = tags1.cbegin();
170 auto it2 = tags2.cbegin();
171
172 while (it1 != end1 && it2 != end2) {
173 if (!filter(*it1)) {
174 ++it1;
175 continue;
176 }
177 if (!filter(*it2)) {
178 ++it2;
179 continue;
180 }
181 if (*it1 == *it2) {
182 ++it1;
183 ++it2;
184 continue;
185 }
186 return false;
187 }
188
189 while (it1 != end1 && !filter(*it1)) {
190 ++it1;
191 }
192
193 while (it2 != end2 && !filter(*it2)) {
194 ++it2;
195 }
196
197 return it1 == end1 && it2 == end2;
198 }
199
200} // namespace osmium
201
202
203#endif // OSMIUM_TAGS_TAGS_FILTER_HPP
osmium::TagList
Definition tag.hpp:119
osmium::TagMatcher
Definition matcher.hpp:48
osmium::Tag
Definition tag.hpp:48
osmium::TagsFilterBase
Definition tags_filter.hpp:66
osmium::TagsFilterBase::add_rule
TagsFilterBase & add_rule(const TResult result, TArgs &&... args)
Definition tags_filter.hpp:114
osmium::TagsFilterBase< bool >::m_default_result
bool m_default_result
Definition tags_filter.hpp:69
osmium::TagsFilterBase::iterator
osmium::memory::CollectionFilterIterator< TagsFilterBase, const osmium::Tag > iterator
Definition tags_filter.hpp:73
osmium::TagsFilterBase::count
std::size_t count() const noexcept
Definition tags_filter.hpp:140
osmium::TagsFilterBase::empty
bool empty() const noexcept
Definition tags_filter.hpp:149
osmium::TagsFilterBase::set_default_result
void set_default_result(const TResult default_result) noexcept
Definition tags_filter.hpp:89
osmium::TagsFilterBase::operator()
TResult operator()(const osmium::Tag &tag) const noexcept
Definition tags_filter.hpp:126
osmium::TagsFilterBase::add_rule
TagsFilterBase & add_rule(const TResult result, const TagMatcher &matcher)
Definition tags_filter.hpp:100
osmium::TagsFilterBase< bool >::m_rules
std::vector< std::pair< bool, TagMatcher > > m_rules
Definition tags_filter.hpp:68
osmium::TagsFilterBase::TagsFilterBase
TagsFilterBase(const TResult default_result=TResult{})
Definition tags_filter.hpp:81
osmium::memory::CollectionFilterIterator
Definition collection.hpp:118
osmium::memory::Collection::cend
const_iterator cend() const noexcept
Definition collection.hpp:233
osmium::memory::Collection::cbegin
const_iterator cbegin() const noexcept
Definition collection.hpp:229
matcher.hpp
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::compare_tags
bool compare_tags(osmium::TagList const &tags1, osmium::TagList const &tags2, TagsFilter const &filter)
Definition tags_filter.hpp:162
osmium::TagsFilter
TagsFilterBase< bool > TagsFilter
Definition tags_filter.hpp:155
tag.hpp