/******************************************************************************

 * Project:  PROJ

 * Purpose:  WKT parser common routines

 * Author:   Even Rouault, <even.rouault at spatialys.com>

 *

 ******************************************************************************

 * Copyright (c) 2018 Even Rouault, <even.rouault at spatialys.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 ****************************************************************************/

#include "wkt_parser.hpp"

#include <algorithm>

#include <string>

// ---------------------------------------------------------------------------

void pj_wkt_error(pj_wkt_parse_context *context, const char *msg) {

    context->errorMsg = "Parsing error : ";

    context->errorMsg += msg;

    context->errorMsg += ". Error occurred around:\n";

    std::string ctxtMsg;

    const int n = static_cast<int>(context->pszLastSuccess - context->pszInput);

    int start_i = std::max(0, n - 40);

    for (int i = start_i; i < n + 40 && context->pszInput[i]; i++) {

        if (context->pszInput[i] == '\r' || context->pszInput[i] == '\n') {

            if (i > n) {

                break;

            } else {

                ctxtMsg.clear();

                start_i = i + 1;

            }

        } else {

            ctxtMsg += context->pszInput[i];

        }

    }

    context->errorMsg += ctxtMsg;

    context->errorMsg += '\n';

    for (int i = start_i; i < n; i++)

        context->errorMsg += ' ';

    context->errorMsg += '^';

}