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https://github.com/dolphin-emu/dolphin.git
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311 lines
8.8 KiB
C++
311 lines
8.8 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include "DolphinQt/Translation.h"
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#include <QApplication>
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#include <QLocale>
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#include <QMessageBox>
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#include <QTranslator>
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#include <algorithm>
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#include <cstring>
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#include <iterator>
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#include "Common/File.h"
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#include "Common/FileUtil.h"
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#include "Common/Logging/Log.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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#include "Core/ConfigManager.h"
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#include "UICommon/UICommon.h"
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constexpr u32 MO_MAGIC_NUMBER = 0x950412de;
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static u16 ReadU16(const char* data)
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{
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u16 value;
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std::memcpy(&value, data, sizeof(value));
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return value;
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}
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static u32 ReadU32(const char* data)
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{
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u32 value;
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std::memcpy(&value, data, sizeof(value));
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return value;
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}
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class MoIterator
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{
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public:
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using iterator_category = std::random_access_iterator_tag;
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using value_type = const char*;
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using difference_type = s64;
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using pointer = value_type;
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using reference = value_type;
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explicit MoIterator(const char* data, u32 table_offset, u32 index = 0)
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: m_data{data}, m_table_offset{table_offset}, m_index{index}
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{
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}
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// This is the actual underlying logic of accessing a Mo file. Patterned after the
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// boost::iterator_facade library, which nicely separates out application logic from
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// iterator-concept logic.
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void advance(difference_type n) { m_index += n; }
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difference_type distance_to(const MoIterator& other) const
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{
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return static_cast<difference_type>(other.m_index) - m_index;
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}
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reference dereference() const
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{
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u32 offset = ReadU32(&m_data[m_table_offset + m_index * 8 + 4]);
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return &m_data[offset];
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}
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// Needed for Iterator concept
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reference operator*() const { return dereference(); }
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MoIterator& operator++()
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{
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advance(1);
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return *this;
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}
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// Needed for InputIterator concept
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bool operator==(const MoIterator& other) const { return distance_to(other) == 0; }
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bool operator!=(const MoIterator& other) const { return !(*this == other); }
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pointer operator->() const { return dereference(); }
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MoIterator operator++(int)
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{
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MoIterator tmp(*this);
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advance(1);
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return tmp;
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}
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// Needed for BidirectionalIterator concept
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MoIterator& operator--()
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{
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advance(-1);
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return *this;
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}
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MoIterator operator--(int)
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{
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MoIterator tmp(*this);
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advance(-1);
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return tmp;
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}
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// Needed for RandomAccessIterator concept
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bool operator<(const MoIterator& other) const { return distance_to(other) > 0; }
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bool operator<=(const MoIterator& other) const { return distance_to(other) >= 0; }
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bool operator>(const MoIterator& other) const { return distance_to(other) < 0; }
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bool operator>=(const MoIterator& other) const { return distance_to(other) <= 0; }
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reference operator[](difference_type n) const { return *(*this + n); }
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MoIterator& operator+=(difference_type n)
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{
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advance(n);
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return *this;
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}
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MoIterator& operator-=(difference_type n)
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{
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advance(-n);
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return *this;
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}
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friend MoIterator operator+(difference_type n, const MoIterator& it) { return it + n; }
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friend MoIterator operator+(const MoIterator& it, difference_type n)
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{
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MoIterator tmp(it);
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tmp += n;
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return tmp;
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}
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difference_type operator-(const MoIterator& other) const { return other.distance_to(*this); }
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friend MoIterator operator-(difference_type n, const MoIterator& it) { return it - n; }
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friend MoIterator operator-(const MoIterator& it, difference_type n)
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{
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MoIterator tmp(it);
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tmp -= n;
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return tmp;
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}
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private:
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const char* m_data;
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u32 m_table_offset;
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u32 m_index;
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};
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class MoFile
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{
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public:
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MoFile() = default;
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explicit MoFile(const std::string& filename)
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{
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File::IOFile file(filename, "rb");
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m_data.resize(file.GetSize());
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file.ReadBytes(m_data.data(), m_data.size());
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if (!file)
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{
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ERROR_LOG(COMMON, "Error reading MO file '%s'", filename.c_str());
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m_data = {};
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return;
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}
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u32 magic = ReadU32(&m_data[0]);
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if (magic != MO_MAGIC_NUMBER)
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{
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ERROR_LOG(COMMON, "MO file '%s' has bad magic number %x\n", filename.c_str(), magic);
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m_data = {};
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return;
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}
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u16 version_major = ReadU16(&m_data[4]);
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if (version_major > 1)
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{
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ERROR_LOG(COMMON, "MO file '%s' has unsupported version number %i", filename.c_str(),
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version_major);
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m_data = {};
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return;
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}
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m_number_of_strings = ReadU32(&m_data[8]);
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m_offset_original_table = ReadU32(&m_data[12]);
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m_offset_translation_table = ReadU32(&m_data[16]);
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}
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u32 GetNumberOfStrings() const { return m_number_of_strings; }
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const char* Translate(const char* original_string) const
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{
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const MoIterator begin(m_data.data(), m_offset_original_table);
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const MoIterator end(m_data.data(), m_offset_original_table, m_number_of_strings);
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auto iter = std::lower_bound(begin, end, original_string,
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[](const char* a, const char* b) { return strcmp(a, b) < 0; });
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if (iter == end || strcmp(*iter, original_string) != 0)
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return original_string;
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u32 offset = ReadU32(&m_data[m_offset_translation_table + std::distance(begin, iter) * 8 + 4]);
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return &m_data[offset];
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}
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private:
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std::vector<char> m_data;
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u32 m_number_of_strings = 0;
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u32 m_offset_original_table = 0;
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u32 m_offset_translation_table = 0;
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};
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class MoTranslator : public QTranslator
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{
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public:
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using QTranslator::QTranslator;
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bool isEmpty() const override { return m_mo_file.GetNumberOfStrings() == 0; }
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bool load(const std::string& filename)
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{
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m_mo_file = MoFile(filename);
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return !isEmpty();
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}
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QString translate(const char* context, const char* source_text,
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const char* disambiguation = nullptr, int n = -1) const override
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{
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return QString::fromUtf8(m_mo_file.Translate(source_text));
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}
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private:
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MoFile m_mo_file;
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};
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static QStringList FindPossibleLanguageCodes(const QString& exact_language_code)
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{
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QStringList possible_language_codes;
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possible_language_codes << exact_language_code;
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// Qt likes to separate language, script, and country by hyphen, but on disk they're separated by
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// underscores.
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possible_language_codes.replaceInStrings(QStringLiteral("-"), QStringLiteral("_"));
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// Try successively dropping subtags (like the stock QTranslator, and as specified by RFC 4647
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// "Matching of Language Tags").
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// Example: fr_Latn_CA -> fr_Latn -> fr
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for (auto lang : QStringList(possible_language_codes))
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{
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while (lang.contains(QLatin1Char('_')))
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{
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lang = lang.left(lang.lastIndexOf(QLatin1Char('_')));
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possible_language_codes << lang;
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}
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}
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// On macOS, Chinese (Simplified) and Chinese (Traditional) are represented as zh-Hans and
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// zh-Hant, but on Linux they're represented as zh-CN and zh-TW. Qt should probably include the
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// script subtags on Linux, but it doesn't.
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const int hans_index = possible_language_codes.indexOf(QStringLiteral("zh_Hans"));
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if (hans_index != -1)
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possible_language_codes.insert(hans_index + 1, QStringLiteral("zh_CN"));
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const int hant_index = possible_language_codes.indexOf(QStringLiteral("zh_Hant"));
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if (hant_index != -1)
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possible_language_codes.insert(hant_index + 1, QStringLiteral("zh_TW"));
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return possible_language_codes;
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}
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static bool TryInstallTranslator(const QString& exact_language_code)
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{
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for (const auto& qlang : FindPossibleLanguageCodes(exact_language_code))
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{
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std::string lang = qlang.toStdString();
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auto filename =
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#if defined _WIN32
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File::GetExeDirectory() + StringFromFormat("/Languages/%s/dolphin-emu.mo", lang.c_str())
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#elif defined __APPLE__
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File::GetBundleDirectory() +
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StringFromFormat("/Contents/Resources/%s.lproj/dolphin-emu.mo", lang.c_str())
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#else
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StringFromFormat(DATA_DIR "/../locale/%s/LC_MESSAGES/dolphin-emu.mo", lang.c_str())
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#endif
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;
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auto* translator = new MoTranslator(QApplication::instance());
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if (translator->load(filename))
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{
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QApplication::instance()->installTranslator(translator);
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QLocale::setDefault(QLocale(exact_language_code));
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UICommon::SetLocale(exact_language_code.toStdString());
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return true;
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}
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translator->deleteLater();
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}
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return false;
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}
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void Translation::Initialize()
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{
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// Hook up Dolphin internal translation
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RegisterStringTranslator([](const char* text) { return QObject::tr(text).toStdString(); });
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// Hook up Qt translations
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auto& configured_language = SConfig::GetInstance().m_InterfaceLanguage;
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if (!configured_language.empty())
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{
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if (TryInstallTranslator(QString::fromStdString(configured_language)))
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return;
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QMessageBox::warning(
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nullptr, QObject::tr("Error"),
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QObject::tr("Error loading selected language. Falling back to system default."));
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configured_language.clear();
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}
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for (const auto& lang : QLocale::system().uiLanguages())
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{
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if (TryInstallTranslator(lang))
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break;
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}
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}
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