/
tools.js
136 lines (122 loc) · 3.35 KB
/
tools.js
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'use strict';
/**
* 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,';
str = prefix + Buffer.from(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 = Buffer.from(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;
};