/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSubst.cpp
*   
***/

#include "../Pch.h"
#pragma hdrstop

#define SUBST_BLOCK SubstParsedData<chartype>::SubstBlock<chartype>

/*****************************************************************************
*
*   Internal functions
*
***/

//============================================================================
template <typename chartype>
bool IVarSubstitute (
    ARRAY(chartype) *   dst,
    const chartype      src[],
    unsigned            varCount,
    const chartype *    varNames[],   // [varCount]
    const chartype *    varValues[]   // [varCount]
) {
    ASSERT(dst);
    ASSERT(src);
    ASSERT(varNames);
    ASSERT(varValues);

    dst->Reserve(StrLen(src) * 5/4);

    bool result = true;
    while (*src) {
        // Copy non-substituted strings and escape %% symbols
        if ((*src != L'%') || (*++src == L'%')) {
            dst->Push(*src++);
            continue;
        }

        // Find variable definition
        const chartype * varStart   = src;
        const chartype * varEnd     = StrChr(varStart, L'%');
        if (!varEnd) {
            // Skip % character and continue
            result = false;
            continue;
        }

        // Validate variable name length
        chartype varBuffer[256];
        if (varEnd - varStart >= arrsize(varBuffer)) {
            result = false;
            src = varEnd + 1;
            continue;
        }

        // Copy variable name excluding trailing '%'
        StrCopy(varBuffer, varStart, varEnd - varStart + 1);
        src = varEnd + 1;

        // Find the variable value and perform substitution
        bool found = false;
        for (unsigned i = 0; i < varCount; ++i) {
            if (StrCmp(varBuffer, varNames[i]))
                continue;
            dst->Add(varValues[i], StrLen(varValues[i]));
            found = true;
            break;
        }

        // Check that variable definition exists
        result = result && found;
    }

    // Terminate string
    dst->Push(0);
    return result;
}

//============================================================================
template <typename chartype>
bool IParseForSubst (
    SubstParsedData<chartype> *     dest,
    const chartype                  src[]
) {
    const chartype * current = src;
    bool result = true;
    while (*current) {
        // Copy non-substituted strings and escape %% symbols
        if ((*current != L'%') || (*++current == L'%')) {
            current++;
            continue;
        }

        // Find variable definition
        const chartype * varStart   = current;
        const chartype * varEnd     = StrChr(varStart, L'%');
        if (!varEnd) {
            // Skip % character and continue
            result = false;
            continue;
        }

        // We've found a variable, copy the current data to a new object
        if (current != src) {
            int strLen = (current - src) - 1;
            SUBST_BLOCK * block = new SUBST_BLOCK;
            block->isVar    = false;
            block->strLen   = strLen;
            block->data     = (chartype*)calloc((strLen + 1), sizeof(chartype));
            memcpy(block->data, src, strLen * sizeof(chartype));

            dest->blocks.Add(block);
        }

        // Validate variable name length
        if (varEnd - varStart >= 256) {
            result = false;
            src = current = varEnd + 1;
            continue;
        }

        // Copy variable name excluding trailing '%'
        int strLen = (varEnd - varStart);
        SUBST_BLOCK * block = new SUBST_BLOCK;
        block->isVar    = true;
        block->strLen   = strLen;
        block->data     = (chartype*)calloc((strLen + 1), sizeof(chartype));
        memcpy(block->data, varStart, strLen * sizeof(chartype));

        dest->blocks.Add(block);

        src = current = varEnd + 1;
    }

    // Check and see if there's any data remaining
    if (current != src) {
        int strLen = (current - src);
        SUBST_BLOCK * block = new SUBST_BLOCK;
        block->isVar    = false;
        block->strLen   = strLen;
        block->data     = (chartype*)calloc((strLen + 1), sizeof(chartype));
        memcpy(block->data, src, strLen * sizeof(chartype));

        dest->blocks.Add(block);
    }

    return result;
}

//============================================================================
template <typename chartype>
bool IVarSubstPreParsed (
    ARRAY(chartype) *                   dst,
    const SubstParsedData<chartype> *   src,
    unsigned                            varCount,
    const chartype *                    varNames[],   // [varCount]
    const chartype *                    varValues[]   // [varCount]
) {
    unsigned approxTotalSize = 0;
    for (unsigned i = 0; i < src->blocks.Count(); ++i) {
        approxTotalSize += src->blocks[i]->strLen;
    }

    dst->Reserve(approxTotalSize * 5/4);

    bool foundAll = true;
    for (unsigned blockIndex = 0; blockIndex < src->blocks.Count(); ++blockIndex) {
        SUBST_BLOCK * block = src->blocks[blockIndex];
        if (block->isVar) {
            bool found = false;
            for (unsigned varIndex = 0; varIndex < varCount; ++varIndex) {
                if (StrCmp(block->data, varNames[varIndex])) {
                    continue;
                }

                dst->Add(varValues[varIndex], StrLen(varValues[varIndex]));
                found = true;
                break;
            }

            foundAll &= found;
        }
        else {
            dst->Add(block->data, block->strLen);
        }
    }
    dst->Push(0);

    return foundAll;
}


/*****************************************************************************
*
*   Exports
*
***/

//============================================================================
bool ParseForSubst (
    SubstParsedData<wchar_t> *    dest,
    const wchar_t                 src[]
) {
    return IParseForSubst(dest, src);
}

//============================================================================
bool ParseForSubst (
    SubstParsedData<char> *     dest,
    const char                  src[]
) {
    return IParseForSubst(dest, src);
}

//============================================================================
bool VarSubstitute (
    ARRAY(wchar_t) *  dst,
    const wchar_t     src[],
    unsigned        varCount,
    const wchar_t *   varNames[],   // [varCount]
    const wchar_t *   varValues[]   // [varCount]
) {
    return IVarSubstitute(dst, src, varCount, varNames, varValues);
}

//============================================================================
bool VarSubstitute (
    ARRAY(char) *   dst,
    const char      src[],
    unsigned        varCount,
    const char *    varNames[],    // [varCount]
    const char *    varValues[]    // [varCount]
) {
    return IVarSubstitute(dst, src, varCount, varNames, varValues);
}

//============================================================================
bool VarSubstitute (
    ARRAY(wchar_t) *                      dst,
    const SubstParsedData<wchar_t> *      src,
    unsigned                            varCount,
    const wchar_t *                       varNames[],   // [varCount]
    const wchar_t *                       varValues[]   // [varCount]
) {
    return IVarSubstPreParsed(dst, src, varCount, varNames, varValues);
}

//============================================================================
bool VarSubstitute (
    ARRAY(char) *                       dst,
    const SubstParsedData<char> *       src,
    unsigned                            varCount,
    const char *                        varNames[],   // [varCount]
    const char *                        varValues[]   // [varCount]
) {
    return IVarSubstPreParsed(dst, src, varCount, varNames, varValues);
}