META-INF.resources.bower_components.globalize.src.number.parse.js Maven / Gradle / Ivy

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define([
    "../util/regexp/cf-g",
    "../util/regexp/dash-g",
    "../util/regexp/zs-g"
], function (regexpCfG, regexpDashG, regexpZsG) {

    /**
     * parse( value, properties )
     *
     * @value [String].
     *
     * @properties [Object] Parser properties is a reduced pre-processed cldr
     * data set returned by numberParserProperties().
     *
     * Return the parsed Number (including Infinity) or NaN when value is invalid.
     * ref: http://www.unicode.org/reports/tr35/tr35-numbers.html
     */
    return function (value, properties) {
        var grammar, invertedNuDigitsMap, invertedSymbolMap, negative, number, prefix, prefixNSuffix,
            suffix, tokenizer, valid;

        // Grammar:
        // - Value <=           NaN | PositiveNumber | NegativeNumber
        // - PositiveNumber <=  PositivePrefix NumberOrInf PositiveSufix
        // - NegativeNumber <=  NegativePrefix NumberOrInf
        // - NumberOrInf <=     Number | Inf
        grammar = [
            ["nan"],
            ["prefix", "infinity", "suffix"],
            ["prefix", "number", "suffix"],
            ["negativePrefix", "infinity", "negativeSuffix"],
            ["negativePrefix", "number", "negativeSuffix"]
        ];

        invertedSymbolMap = properties[0];
        invertedNuDigitsMap = properties[1] || {};
        tokenizer = properties[2];

        // Loose Matching:
        // - Ignore all format characters, which includes RLM, LRM or ALM used to control BIDI
        //   formatting.
        // - Map all characters in [:Zs:] to U+0020 SPACE;
        // - Map all characters in [:Dash:] to U+002D HYPHEN-MINUS;
        value = value
            .replace(regexpCfG, "")
            .replace(regexpDashG, "-")
            .replace(regexpZsG, " ");

        function parse(type) {
            return function (lexeme) {

                // Reverse localized symbols and numbering system.
                lexeme = lexeme.split("").map(function (character) {
                    return invertedSymbolMap[character] ||
                        invertedNuDigitsMap[character] ||
                        character;
                }).join("");

                switch (type) {
                    case "infinity":
                        number = Infinity;
                        break;

                    case "nan":
                        number = NaN;
                        break;

                    case "number":

                        // Remove grouping separators.
                        lexeme = lexeme.replace(/,/g, "");

                        number = +lexeme;
                        break;

                    case "prefix":
                    case "negativePrefix":
                        prefix = lexeme;
                        break;

                    case "suffix":
                        suffix = lexeme;
                        break;

                    case "negativeSuffix":
                        suffix = lexeme;
                        negative = true;
                        break;

                    // This should never be reached.
                    default:
                        throw new Error("Internal error");
                }
                return "";
            };
        }

        function tokenizeNParse(_value, grammar) {
            return grammar.some(function (statement) {
                var value = _value;

                // The whole grammar statement should be used (i.e., .every() return true) and value be
                // entirely consumed (i.e., !value.length).
                return statement.every(function (type) {
                    if (value.match(tokenizer[type]) === null) {
                        return false;
                    }

                    // Consume and parse it.
                    value = value.replace(tokenizer[type], parse(type));
                    return true;
                }) && !value.length;
            });
        }

        valid = tokenizeNParse(value, grammar);

        // NaN
        if (!valid || isNaN(number)) {
            return NaN;
        }

        prefixNSuffix = "" + prefix + suffix;

        // Percent
        if (prefixNSuffix.indexOf("%") !== -1) {
            number /= 100;

            // Per mille
        } else if (prefixNSuffix.indexOf("\u2030") !== -1) {
            number /= 1000;
        }

        // Negative number
        if (negative) {
            number *= -1;
        }

        return number;
    };

});