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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-9-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

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

namespace juce::build_tools
{

    static bool isReservedKeyword (String::CharPointerType token, const int tokenLength) noexcept
    {
        static const char* const keywords2Char[] =
                { "do", "if", "or", nullptr };

        static const char* const keywords3Char[] =
                { "and", "asm", "for", "int", "new", "not", "try", "xor", nullptr };

        static const char* const keywords4Char[] =
                { "auto", "bool", "case", "char", "else", "enum", "goto",
                  "long", "this", "true", "void", nullptr };

        static const char* const keywords5Char[] =
                { "bitor", "break", "catch", "class", "compl", "const", "false", "final",
                  "float", "or_eq", "short", "throw", "union", "using", "while", nullptr };

        static const char* const keywords6Char[] =
                { "and_eq", "bitand", "delete", "double", "export", "extern", "friend",
                  "import", "inline", "module", "not_eq", "public", "return", "signed",
                  "sizeof", "static", "struct", "switch", "typeid", "xor_eq", nullptr };

        static const char* const keywords7Char[] =
                { "__cdecl", "_Pragma", "alignas", "alignof", "concept", "default",
                  "mutable", "nullptr", "private", "typedef", "uint8_t", "virtual",
                  "wchar_t", nullptr };

        static const char* const keywordsOther[] =
                { "@class", "@dynamic", "@end", "@implementation", "@interface", "@public",
                  "@private", "@protected", "@property", "@synthesize", "__fastcall", "__stdcall",
                  "atomic_cancel", "atomic_commit", "atomic_noexcept", "char16_t", "char32_t",
                  "co_await", "co_return", "co_yield", "const_cast", "constexpr", "continue",
                  "decltype", "dynamic_cast", "explicit", "namespace", "noexcept", "operator", "override",
                  "protected", "register", "reinterpret_cast", "requires", "static_assert",
                  "static_cast", "synchronized", "template", "thread_local", "typename", "unsigned",
                  "volatile", nullptr };

        const char* const* k;

        switch (tokenLength)
        {
            case 2:     k = keywords2Char; break;
            case 3:     k = keywords3Char; break;
            case 4:     k = keywords4Char; break;
            case 5:     k = keywords5Char; break;
            case 6:     k = keywords6Char; break;
            case 7:     k = keywords7Char; break;

            default:
                if (tokenLength < 2 || tokenLength > 16)
                    return false;

                k = keywordsOther;
                break;
        }

        for (int i = 0; k[i] != nullptr; ++i)
            if (token.compare (CharPointer_ASCII (k[i])) == 0)
                return true;

        return false;
    }

    static bool isReservedKeyword (const String& token) noexcept
    {
        return isReservedKeyword (token.getCharPointer(), token.length());
    }

    //==============================================================================
    /** Takes a UTF8 string and writes it to a stream using standard C++ escape sequences for any
        non-ascii bytes.

        Although not strictly a tokenising function, this is still a function that often comes in
        handy when working with C++ code!

        Note that addEscapeChars() is easier to use than this function if you're working with Strings.

        @see addEscapeChars
    */
    static void writeEscapeChars (OutputStream& out, const char* utf8, const int numBytesToRead,
                                  const int maxCharsOnLine, const bool breakAtNewLines,
                                  const bool replaceSingleQuotes, const bool allowStringBreaks)
    {
        int charsOnLine = 0;
        bool lastWasHexEscapeCode = false;
        bool trigraphDetected = false;

        for (int i = 0; i < numBytesToRead || numBytesToRead < 0; ++i)
        {
            auto c = (unsigned char) utf8[i];
            bool startNewLine = false;

            switch (c)
            {

                case '\t':  out << "\\t";  trigraphDetected = false; lastWasHexEscapeCode = false; charsOnLine += 2; break;
                case '\r':  out << "\\r";  trigraphDetected = false; lastWasHexEscapeCode = false; charsOnLine += 2; break;
                case '\n':  out << "\\n";  trigraphDetected = false; lastWasHexEscapeCode = false; charsOnLine += 2; startNewLine = breakAtNewLines; break;
                case '\\':  out << "\\\\"; trigraphDetected = false; lastWasHexEscapeCode = false; charsOnLine += 2; break;
                case '\"':  out << "\\\""; trigraphDetected = false; lastWasHexEscapeCode = false; charsOnLine += 2; break;

                case '?':
                    if (trigraphDetected)
                    {
                        out << "\\?";
                        charsOnLine++;
                        trigraphDetected = false;
                    }
                    else
                    {
                        out << "?";
                        trigraphDetected = true;
                    }

                    lastWasHexEscapeCode = false;
                    charsOnLine++;
                    break;

                case 0:
                    if (numBytesToRead < 0)
                        return;

                    out << "\\0";
                    lastWasHexEscapeCode = true;
                    trigraphDetected = false;
                    charsOnLine += 2;
                    break;

                case '\'':
                    if (replaceSingleQuotes)
                    {
                        out << "\\\'";
                        lastWasHexEscapeCode = false;
                        trigraphDetected = false;
                        charsOnLine += 2;
                        break;
                    }

                    // deliberate fall-through...

                default:
                    if (c >= 32 && c < 127 && ! (lastWasHexEscapeCode  // (have to avoid following a hex escape sequence with a valid hex digit)
                                                 && CharacterFunctions::getHexDigitValue (c) >= 0))
                    {
                        out << (char) c;
                        lastWasHexEscapeCode = false;
                        trigraphDetected = false;
                        ++charsOnLine;
                    }
                    else if (allowStringBreaks && lastWasHexEscapeCode && c >= 32 && c < 127)
                    {
                        out << "\"\"" << (char) c;
                        lastWasHexEscapeCode = false;
                        trigraphDetected = false;
                        charsOnLine += 3;
                    }
                    else
                    {
                        out << (c < 16 ? "\\x0" : "\\x") << String::toHexString ((int) c);
                        lastWasHexEscapeCode = true;
                        trigraphDetected = false;
                        charsOnLine += 4;
                    }

                    break;
            }

            if ((startNewLine || (maxCharsOnLine > 0 && charsOnLine >= maxCharsOnLine))
                && (numBytesToRead < 0 || i < numBytesToRead - 1))
            {
                charsOnLine = 0;
                out << "\"" << newLine << "\"";
                lastWasHexEscapeCode = false;
            }
        }
    }

} // namespace juce::build_tools
