guess.cxx

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