'use strict';

var FS = require('fs');

/**
 * Encode plain SVG data string into Data URI string.
 *
 * @param {String} str input string
 * @param {String} type Data URI type
 * @return {String} output string
 */
exports.encodeSVGDatauri = function(str, type) {
    var prefix = 'data:image/svg+xml';
    if (!type || type === 'base64') {
        // base64
        prefix += ';base64,';
        if (Buffer.from) {
            str = prefix + Buffer.from(str).toString('base64');
        } else {
            str = prefix + new Buffer(str).toString('base64');
        }
    } else if (type === 'enc') {
        // URI encoded
        str = prefix + ',' + encodeURIComponent(str);
    } else if (type === 'unenc') {
        // unencoded
        str = prefix + ',' + str;
    }
    return str;
};

/**
 * Decode SVG Data URI string into plain SVG string.
 *
 * @param {string} str input string
 * @return {String} output string
 */
exports.decodeSVGDatauri = function(str) {
    var regexp = /data:image\/svg\+xml(;charset=[^;,]*)?(;base64)?,(.*)/;
    var match = regexp.exec(str);

    // plain string
    if (!match) return str;

    var data = match[3];

    if (match[2]) {
        // base64
        str = new Buffer(data, 'base64').toString('utf8');
    } else if (data.charAt(0) === '%') {
        // URI encoded
        str = decodeURIComponent(data);
    } else if (data.charAt(0) === '<') {
        // unencoded
        str = data;
    }
    return str;
};

exports.intersectArrays = function(a, b) {
    return a.filter(function(n) {
        return b.indexOf(n) > -1;
    });
};

/**
 * Convert a row of numbers to an optimized string view.
 *
 * @example
 * [0, -1, .5, .5] → "0-1 .5.5"
 *
 * @param {number[]} data
 * @param {Object} params
 * @param {string?} command path data instruction
 * @return {string}
 */
exports.cleanupOutData = function(data, params, command) {
    var str = '',
        delimiter,
        prev;

    data.forEach(function(item, i) {
        // space delimiter by default
        delimiter = ' ';

        // no extra space in front of first number
        if (i == 0) delimiter = '';

        // no extra space after 'arcto' command flags
        if (params.noSpaceAfterFlags && (command == 'A' || command == 'a')) {
            var pos = i % 7;
            if (pos == 4 || pos == 5) delimiter = '';
        }

        // remove floating-point numbers leading zeros
        // 0.5 → .5
        // -0.5 → -.5
        if (params.leadingZero) {
            item = removeLeadingZero(item);
        }

        // no extra space in front of negative number or
        // in front of a floating number if a previous number is floating too
        if (
            params.negativeExtraSpace &&
            delimiter != '' &&
            (item < 0 ||
                (String(item).charCodeAt(0) == 46 && prev % 1 !== 0)
            )
        ) {
            delimiter = '';
        }
        // save prev item value
        prev = item;
        str += delimiter + item;
    });
    return str;
};

/**
 * Remove floating-point numbers leading zero.
 *
 * @example
 * 0.5 → .5
 *
 * @example
 * -0.5 → -.5
 *
 * @param {Float} num input number
 *
 * @return {String} output number as string
 */
var removeLeadingZero = exports.removeLeadingZero = function(num) {
    var strNum = num.toString();

    if (0 < num && num < 1 && strNum.charCodeAt(0) == 48) {
        strNum = strNum.slice(1);
    } else if (-1 < num && num < 0 && strNum.charCodeAt(1) == 48) {
        strNum = strNum.charAt(0) + strNum.slice(2);
    }
    return strNum;
};


/**
 * Synchronously check if path is a directory. Tolerant to errors like ENOENT.
 * @param {string} path
 */
exports.checkIsDir = function(path) {
    try {
        return FS.lstatSync(path).isDirectory();
    } catch(e) {
        return false;
    }
};
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