/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <sal/config.h>

#include <cassert>

#include <string.h>

#ifdef SYSTEM_LIBEXTTEXTCAT

#include <libexttextcat/textcat.h>

#else

#include <textcat.h>

#endif

#include "guess.hxx"

/* Old textcat.h versions defined bad spelled constants. */

#ifndef TEXTCAT_RESULT_UNKNOWN_STR

#define TEXTCAT_RESULT_UNKNOWN_STR _TEXTCAT_RESULT_UNKOWN

#endif

#ifndef TEXTCAT_RESULT_SHORT_STR

#define TEXTCAT_RESULT_SHORT_STR _TEXTCAT_RESULT_SHORT

#endif

Guess::Guess()

    : language_str(DEFAULT_LANGUAGE)

    , country_str(DEFAULT_COUNTRY)

{

}

/*

* this use a char * string to build the guess object

* a string like those is made as : [language-country-encoding]...

*

*/

Guess::Guess(const char * guess_str)

    : language_str(DEFAULT_LANGUAGE)

    , country_str(DEFAULT_COUNTRY)

{

    //if the guess is not like "UNKNOWN" or "SHORT", go into the brackets

    if(strcmp(guess_str + 1, TEXTCAT_RESULT_UNKNOWN_STR) == 0

       || strcmp(guess_str + 1, TEXTCAT_RESULT_SHORT_STR) == 0)

        return;

    // From how this ctor is called from SimpleGuesser::GuessLanguage and

    // SimpleGuesser::GetManagedLanguages in

    // lingucomponent/source/languageguessing/simpleguesser.cxx, guess_str must start with "[":

    assert(guess_str[0] == GUESS_SEPARATOR_OPEN);

    auto const start = guess_str + 1;

    // Only look at the prefix of guess_str, delimited by the next "]" or "[" or end-of-string;

    // split it into at most three segments separated by "-" (where excess occurrences of "-"

    // would become part of the third segment), like "en-US-utf8"; the first segment denotes the

    // language; if there are three segments, the second denotes the country and the third the

    // encoding; otherwise, the second segment, if any (e.g., in "haw-utf8"), denotes the

    // encoding:

    char const * dash1 = nullptr;

    char const * dash2 = nullptr;

    auto p = start;

    for (;; ++p) {

        auto const c = *p;

        if (c == '\0' || c == GUESS_SEPARATOR_OPEN || c == GUESS_SEPARATOR_CLOSE) {

            break;

        }

        if (c == GUESS_SEPARATOR_SEP) {

            if (dash1 == nullptr) {

                dash1 = p;

            } else {

                dash2 = p;

                // The encoding is ignored, so we can stop as soon as we found the second "-":

                break;

            }

        }

    }

    auto const langLen = (dash1 == nullptr ? p : dash1) - start;

    if (langLen != 0) { // if not we use the default value

        language_str.assign(start, langLen);

    }

    if (dash2 != nullptr) {

        country_str.assign(dash1 + 1, dash2 - (dash1 + 1));

    }

}

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