'use strict';

exports.type = 'perItem';

exports.active = true;

exports.description = 'converts colors: rgb() to #rrggbb and #rrggbb to #rgb';

exports.params = {
    currentColor: false,
    names2hex: true,
    rgb2hex: true,
    shorthex: true,
    shortname: true
};

var collections = require('./_collections'),
    rNumber = '([+-]?(?:\\d*\\.\\d+|\\d+\\.?)%?)',
    rComma = '\\s*,\\s*',
    regRGB = new RegExp('^rgb\\(\\s*' + rNumber + rComma + rNumber + rComma + rNumber + '\\s*\\)$'),
    regHEX = /^\#(([a-fA-F0-9])\2){3}$/,
    none = /\bnone\b/i;

/**
 * Convert different colors formats in element attributes to hex.
 *
 * @see http://www.w3.org/TR/SVG/types.html#DataTypeColor
 * @see http://www.w3.org/TR/SVG/single-page.html#types-ColorKeywords
 *
 * @example
 * Convert color name keyword to long hex:
 * fuchsia ➡ #ff00ff
 *
 * Convert rgb() to long hex:
 * rgb(255, 0, 255) ➡ #ff00ff
 * rgb(50%, 100, 100%) ➡ #7f64ff
 *
 * Convert long hex to short hex:
 * #aabbcc ➡ #abc
 *
 * Convert hex to short name
 * #000080 ➡ navy
 *
 * @param {Object} item current iteration item
 * @param {Object} params plugin params
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function(item, params) {

    if (item.elem) {

        item.eachAttr(function(attr) {

            if (collections.colorsProps.indexOf(attr.name) > -1) {

                var val = attr.value,
                    match;

                // Convert colors to currentColor
                if (params.currentColor) {
                    if (typeof params.currentColor === 'string') {
                        match = val === params.currentColor;
                    } else if (params.currentColor.exec) {
                        match = params.currentColor.exec(val);
                    } else {
                        match = !val.match(none);
                    }
                    if (match) {
                        val = 'currentColor';
                    }
                }

                // Convert color name keyword to long hex
                if (params.names2hex && val.toLowerCase() in collections.colorsNames) {
                    val = collections.colorsNames[val.toLowerCase()];
                }

                // Convert rgb() to long hex
                if (params.rgb2hex && (match = val.match(regRGB))) {
                    match = match.slice(1, 4).map(function(m) {
                        if (m.indexOf('%') > -1)
                            m = Math.round(parseFloat(m) * 2.55);

                        return Math.max(0, Math.min(m, 255));
                    });

                    val = rgb2hex(match);
                }

                // Convert long hex to short hex
                if (params.shorthex && (match = val.match(regHEX))) {
                    val = '#' + match[0][1] + match[0][3] + match[0][5];
                }

                // Convert hex to short name
                if (params.shortname) {
                    var lowerVal = val.toLowerCase();
                    if (lowerVal in collections.colorsShortNames) {
                        val = collections.colorsShortNames[lowerVal];
                    }
                }

                attr.value = val;

            }

        });

    }

};

/**
 * Convert [r, g, b] to #rrggbb.
 *
 * @see https://gist.github.com/983535
 *
 * @example
 * rgb2hex([255, 255, 255]) // '#ffffff'
 *
 * @param {Array} rgb [r, g, b]
 * @return {String} #rrggbb
 *
 * @author Jed Schmidt
 */
function rgb2hex(rgb) {
    return '#' + ('00000' + (rgb[0] << 16 | rgb[1] << 8 | rgb[2]).toString(16)).slice(-6).toUpperCase();
}
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