icu4c/source/i18n/standardplural.cpp

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *******************************************************************************
 * Copyright (C) 2015, International Business Machines Corporation
 * and others. All Rights Reserved.
 *******************************************************************************
 * standardplural.cpp
 *
 * created on: 2015dec14
 * created by: Markus W. Scherer
 */

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/unistr.h"
#include "cstring.h"
#include "standardplural.h"
#include "uassert.h"

U_NAMESPACE_BEGIN

static const char *gKeywords[StandardPlural::COUNT] = {
    "zero", "one", "two", "few", "many", "other", "=0", "=1"
};

const char *StandardPlural::getKeyword(Form p) {
    U_ASSERT(ZERO <= p && p < COUNT);
    return gKeywords[p];
}

int32_t StandardPlural::indexOrNegativeFromString(const char *keyword) {
    switch (*keyword++) {
    case 'f':
        if (uprv_strcmp(keyword, "ew") == 0) {
            return FEW;
        }
        break;
    case 'm':
        if (uprv_strcmp(keyword, "any") == 0) {
            return MANY;
        }
        break;
    case 'o':
        if (uprv_strcmp(keyword, "ther") == 0) {
            return OTHER;
        } else if (uprv_strcmp(keyword, "ne") == 0) {
            return ONE;
        }
        break;
    case 't':
        if (uprv_strcmp(keyword, "wo") == 0) {
            return TWO;
        }
        break;
    case 'z':
        if (uprv_strcmp(keyword, "ero") == 0) {
            return ZERO;
        }
        break;
    case '=':
        if (uprv_strcmp(keyword, "0") == 0) {
            return EQ_0;
        } else if (uprv_strcmp(keyword, "1") == 0) {
            return EQ_1;
        }
        break;
    // Also allow "0" and "1"
    case '0':
        if (*keyword == 0) {
            return EQ_0;
        }
        break;
    case '1':
        if (*keyword == 0) {
            return EQ_1;
        }
        break;
    default:
        break;
    }
    return -1;
}

static const char16_t gZero[] = u"zero";
static const char16_t gOne[] = u"one";
static const char16_t gTwo[] = u"two";
static const char16_t gFew[] = u"few";
static const char16_t gMany[] = u"many";
static const char16_t gOther[] = u"other";
static const char16_t gEq0[] = u"=0";
static const char16_t gEq1[] = u"=1";

int32_t StandardPlural::indexOrNegativeFromString(const UnicodeString &keyword) {
    switch (keyword.length()) {
    case 1:
        if (keyword.charAt(0) == '0') {
            return EQ_0;
        } else if (keyword.charAt(0) == '1') {
            return EQ_1;
        }
        break;
    case 2:
        if (keyword.compare(gEq0, 2) == 0) {
            return EQ_0;
        } else if (keyword.compare(gEq1, 2) == 0) {
            return EQ_1;
        }
        break;
    case 3:
        if (keyword.compare(gOne, 3) == 0) {
            return ONE;
        } else if (keyword.compare(gTwo, 3) == 0) {
            return TWO;
        } else if (keyword.compare(gFew, 3) == 0) {
            return FEW;
        }
        break;
    case 4:
        if (keyword.compare(gMany, 4) == 0) {
            return MANY;
        } else if (keyword.compare(gZero, 4) == 0) {
            return ZERO;
        }
        break;
    case 5:
        if (keyword.compare(gOther, 5) == 0) {
            return OTHER;
        }
        break;
    default:
        break;
    }
    return -1;
}

int32_t StandardPlural::indexFromString(const char *keyword, UErrorCode &errorCode) {
    if (U_FAILURE(errorCode)) { return OTHER; }
    int32_t i = indexOrNegativeFromString(keyword);
    if (i >= 0) {
        return i;
    } else {
        errorCode = U_ILLEGAL_ARGUMENT_ERROR;
        return OTHER;
    }
}

int32_t StandardPlural::indexFromString(const UnicodeString &keyword, UErrorCode &errorCode) {
    if (U_FAILURE(errorCode)) { return OTHER; }
    int32_t i = indexOrNegativeFromString(keyword);
    if (i >= 0) {
        return i;
    } else {
        errorCode = U_ILLEGAL_ARGUMENT_ERROR;
        return OTHER;
    }
}

U_NAMESPACE_END

#endif  // !UCONFIG_NO_FORMATTING