1 | #pragma once |
2 | |
3 | #include <string> |
4 | #include <vector> |
5 | #include <Poco/Exception.h> |
6 | #include <common/StringRef.h> |
7 | #include <common/Types.h> |
8 | #include "GeodataProviders/INamesProvider.h" |
9 | |
10 | |
11 | /** A class that allows you to recognize by region id its text name in one of the supported languages. |
12 | * |
13 | * Information about region names loads from text files with the following format names: regions_names_xx.txt, |
14 | * where xx is one of the two letters of the following supported languages. |
15 | * |
16 | * Can on request update the data. |
17 | */ |
18 | class RegionsNames |
19 | { |
20 | /// Language name and fallback language name. |
21 | #define FOR_EACH_LANGUAGE(M) \ |
22 | M(ru, ru, 0) \ |
23 | M(en, ru, 1) \ |
24 | M(ua, ru, 2) \ |
25 | M(uk, ua, 3) \ |
26 | M(by, ru, 4) \ |
27 | M(kz, ru, 5) \ |
28 | M(tr, en, 6) \ |
29 | M(de, en, 7) \ |
30 | M(uz, ru, 8) \ |
31 | M(lv, ru, 9) \ |
32 | M(lt, ru, 10) \ |
33 | M(et, ru, 11) \ |
34 | M(pt, en, 12) \ |
35 | M(he, en, 13) \ |
36 | M(vi, en, 14) |
37 | |
38 | static constexpr size_t total_languages = 15; |
39 | |
40 | public: |
41 | enum class Language : size_t |
42 | { |
43 | #define M(NAME, FALLBACK, NUM) NAME = NUM, |
44 | FOR_EACH_LANGUAGE(M) |
45 | #undef M |
46 | }; |
47 | |
48 | private: |
49 | static inline constexpr const char * languages[] = |
50 | { |
51 | #define M(NAME, FALLBACK, NUM) #NAME, |
52 | FOR_EACH_LANGUAGE(M) |
53 | #undef M |
54 | }; |
55 | |
56 | static inline constexpr Language fallbacks[] = |
57 | { |
58 | #define M(NAME, FALLBACK, NUM) Language::FALLBACK, |
59 | FOR_EACH_LANGUAGE(M) |
60 | #undef M |
61 | }; |
62 | |
63 | using NamesSources = std::vector<std::shared_ptr<ILanguageRegionsNamesDataSource>>; |
64 | |
65 | using Chars = std::vector<char>; |
66 | using CharsForLanguageID = std::vector<Chars>; |
67 | using StringRefs = std::vector<StringRef>; /// Lookup table RegionID -> StringRef |
68 | using StringRefsForLanguageID = std::vector<StringRefs>; |
69 | |
70 | |
71 | NamesSources names_sources = NamesSources(total_languages); |
72 | |
73 | /// Bytes of names for each language, laid out in a row, separated by zeros |
74 | CharsForLanguageID chars = CharsForLanguageID(total_languages); |
75 | |
76 | /// Mapping for each language from the region id into a pointer to the byte range of the name |
77 | StringRefsForLanguageID names_refs = StringRefsForLanguageID(total_languages); |
78 | |
79 | static std::string dumpSupportedLanguagesNames(); |
80 | public: |
81 | RegionsNames(IRegionsNamesDataProviderPtr data_provider); |
82 | |
83 | StringRef getRegionName(RegionID region_id, Language language) const |
84 | { |
85 | size_t language_id = static_cast<size_t>(language); |
86 | |
87 | if (region_id >= names_refs[language_id].size()) |
88 | return StringRef("" , 0); |
89 | |
90 | StringRef ref = names_refs[language_id][region_id]; |
91 | |
92 | static constexpr size_t root_language = static_cast<size_t>(Language::ru); |
93 | while (ref.size == 0 && language_id != root_language) |
94 | { |
95 | language_id = static_cast<size_t>(fallbacks[language_id]); |
96 | ref = names_refs[language_id][region_id]; |
97 | } |
98 | |
99 | return ref; |
100 | } |
101 | |
102 | static Language getLanguageEnum(const std::string & language) |
103 | { |
104 | #define M(NAME, FALLBACK, NUM) \ |
105 | if (0 == language.compare(#NAME)) \ |
106 | return Language::NAME; |
107 | FOR_EACH_LANGUAGE(M) |
108 | #undef M |
109 | throw Poco::Exception("Unsupported language for region name. Supported languages are: " + dumpSupportedLanguagesNames() + "." ); |
110 | } |
111 | |
112 | void reload(); |
113 | }; |
114 | |