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60 lines
2.8 KiB
C++
60 lines
2.8 KiB
C++
#ifndef COMPONENTS_L10N_MESSAGEBUNDLES_H
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#define COMPONENTS_L10N_MESSAGEBUNDLES_H
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#include <functional>
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#include <map>
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#include <string_view>
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#include <unordered_map>
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#include <vector>
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#include <unicode/locid.h>
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#include <unicode/msgfmt.h>
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namespace l10n
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{
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/**
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* @brief A collection of Message Bundles
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*
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* Class handling localised message storage and lookup, including fallback locales when messages are missing.
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*
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* If no fallback locale is provided (or a message fails to be found), the key will be formatted instead,
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* or returned verbatim if formatting fails.
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*
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*/
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class MessageBundles
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{
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public:
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/* @brief Constructs an empty MessageBundles
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*
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* @param preferredLocales user-requested locales, in order of priority
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* Each locale will be checked when looking up messages, in case some resource files are incomplete.
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* For each locale which contains a country code or a variant, the locales obtained by removing first
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* the variant, then the country code, will also be checked before moving on to the next locale in the
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* list.
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* @param fallbackLocale the fallback locale which should be used if messages cannot be found for the user
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* preferred locales
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*/
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MessageBundles(const std::vector<icu::Locale>& preferredLocales, icu::Locale& fallbackLocale);
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std::string formatMessage(std::string_view key, const std::map<std::string, icu::Formattable>& args) const;
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std::string formatMessage(std::string_view key, const std::vector<icu::UnicodeString>& argNames,
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const std::vector<icu::Formattable>& args) const;
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void setPreferredLocales(const std::vector<icu::Locale>& preferredLocales);
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const std::vector<icu::Locale>& getPreferredLocales() const { return mPreferredLocales; }
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void load(std::istream& input, const icu::Locale& lang, const std::string& path);
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bool isLoaded(const icu::Locale& loc) const { return mBundles.find(loc.getName()) != mBundles.end(); }
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const icu::Locale& getFallbackLocale() const { return mFallbackLocale; }
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void setGmstLoader(std::function<std::string(std::string_view)> fn) { mGmstLoader = std::move(fn); }
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private:
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// icu::Locale isn't hashable (or comparable), so we use the string form instead, which is canonicalized
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std::unordered_map<std::string, std::unordered_map<std::string, icu::MessageFormat>> mBundles;
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const icu::Locale mFallbackLocale;
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std::vector<std::string> mPreferredLocaleStrings;
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std::vector<icu::Locale> mPreferredLocales;
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std::function<std::string(std::string_view)> mGmstLoader;
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const icu::MessageFormat* findMessage(std::string_view key, const std::string& localeName) const;
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};
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}
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#endif // COMPONENTS_L10N_MESSAGEBUNDLES_H
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