JUCE/modules/juce_core/text/juce_LocalisedStrings.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2016 - ROLI Ltd.

   Permission is granted to use this software under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license/

   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
   FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
   OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
   USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
   OF THIS SOFTWARE.

   -----------------------------------------------------------------------------

   To release a closed-source product which uses other parts of JUCE not
   licensed under the ISC terms, commercial licenses are available: visit
   www.juce.com for more information.

  ==============================================================================
*/

LocalisedStrings::LocalisedStrings (const String& fileContents, bool ignoreCase)
{
    loadFromText (fileContents, ignoreCase);
}

LocalisedStrings::LocalisedStrings (const File& fileToLoad, bool ignoreCase)
{
    loadFromText (fileToLoad.loadFileAsString(), ignoreCase);
}

LocalisedStrings::LocalisedStrings (const LocalisedStrings& other)
    : languageName (other.languageName), countryCodes (other.countryCodes),
      translations (other.translations), fallback (createCopyIfNotNull (other.fallback.get()))
{
}

LocalisedStrings& LocalisedStrings::operator= (const LocalisedStrings& other)
{
    languageName = other.languageName;
    countryCodes = other.countryCodes;
    translations = other.translations;
    fallback = createCopyIfNotNull (other.fallback.get());
    return *this;
}

LocalisedStrings::~LocalisedStrings()
{
}

//==============================================================================
String LocalisedStrings::translate (const String& text) const
{
    if (fallback != nullptr && ! translations.containsKey (text))
        return fallback->translate (text);

    return translations.getValue (text, text);
}

String LocalisedStrings::translate (const String& text, const String& resultIfNotFound) const
{
    if (fallback != nullptr && ! translations.containsKey (text))
        return fallback->translate (text, resultIfNotFound);

    return translations.getValue (text, resultIfNotFound);
}

namespace
{
   #if JUCE_CHECK_MEMORY_LEAKS
    // By using this object to force a LocalisedStrings object to be created
    // before the currentMappings object, we can force the static order-of-destruction to
    // delete the currentMappings object first, which avoids a bogus leak warning.
    // (Oddly, just creating a LocalisedStrings on the stack doesn't work in gcc, it
    // has to be created with 'new' for this to work..)
    struct LeakAvoidanceTrick
    {
        LeakAvoidanceTrick()
        {
            const ScopedPointer<LocalisedStrings> dummy (new LocalisedStrings (String(), false));
        }
    };

    LeakAvoidanceTrick leakAvoidanceTrick;
   #endif

    SpinLock currentMappingsLock;
    ScopedPointer<LocalisedStrings> currentMappings;

    static int findCloseQuote (const String& text, int startPos)
    {
        juce_wchar lastChar = 0;
        String::CharPointerType t (text.getCharPointer() + startPos);

        for (;;)
        {
            const juce_wchar c = t.getAndAdvance();

            if (c == 0 || (c == '"' && lastChar != '\\'))
                break;

            lastChar = c;
            ++startPos;
        }

        return startPos;
    }

    static String unescapeString (const String& s)
    {
        return s.replace ("\\\"", "\"")
                .replace ("\\\'", "\'")
                .replace ("\\t", "\t")
                .replace ("\\r", "\r")
                .replace ("\\n", "\n");
    }
}

void LocalisedStrings::loadFromText (const String& fileContents, bool ignoreCase)
{
    translations.setIgnoresCase (ignoreCase);

    StringArray lines;
    lines.addLines (fileContents);

    for (int i = 0; i < lines.size(); ++i)
    {
        String line (lines[i].trim());

        if (line.startsWithChar ('"'))
        {
            int closeQuote = findCloseQuote (line, 1);

            const String originalText (unescapeString (line.substring (1, closeQuote)));

            if (originalText.isNotEmpty())
            {
                const int openingQuote = findCloseQuote (line, closeQuote + 1);
                closeQuote = findCloseQuote (line, openingQuote + 1);

                const String newText (unescapeString (line.substring (openingQuote + 1, closeQuote)));

                if (newText.isNotEmpty())
                    translations.set (originalText, newText);
            }
        }
        else if (line.startsWithIgnoreCase ("language:"))
        {
            languageName = line.substring (9).trim();
        }
        else if (line.startsWithIgnoreCase ("countries:"))
        {
            countryCodes.addTokens (line.substring (10).trim(), true);
            countryCodes.trim();
            countryCodes.removeEmptyStrings();
        }
    }

    translations.minimiseStorageOverheads();
}

void LocalisedStrings::addStrings (const LocalisedStrings& other)
{
    jassert (languageName == other.languageName);
    jassert (countryCodes == other.countryCodes);

    translations.addArray (other.translations);
}

void LocalisedStrings::setFallback (LocalisedStrings* f)
{
    fallback = f;
}

//==============================================================================
void LocalisedStrings::setCurrentMappings (LocalisedStrings* newTranslations)
{
    const SpinLock::ScopedLockType sl (currentMappingsLock);
    currentMappings = newTranslations;
}

LocalisedStrings* LocalisedStrings::getCurrentMappings()
{
    return currentMappings;
}

String LocalisedStrings::translateWithCurrentMappings (const String& text)  { return juce::translate (text); }
String LocalisedStrings::translateWithCurrentMappings (const char* text)    { return juce::translate (text); }

JUCE_API String translate (const String& text)       { return juce::translate (text, text); }
JUCE_API String translate (const char* text)         { return juce::translate (String (text)); }
JUCE_API String translate (CharPointer_UTF8 text)    { return juce::translate (String (text)); }

JUCE_API String translate (const String& text, const String& resultIfNotFound)
{
    const SpinLock::ScopedLockType sl (currentMappingsLock);

    if (const LocalisedStrings* const mappings = LocalisedStrings::getCurrentMappings())
        return mappings->translate (text, resultIfNotFound);

    return resultIfNotFound;
}