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const selectorReg = /^([^#\.\[]+)?(?:#([^\.\[]+))?(?:\.((?:[^\[\]\\]|\\.)+))?((?:\[[^\]]*\])+)?$/; // eslint-disable-line
const attributeReg = /^([a-zA-Z0-9_-]*[^~|^$*!=])(?:([~|^$*!]?)=['"]?([^'"]*)['"]?)?$/;
const splitReg = /\s*,\s*/;
function expandMatcher(matcher) {
if (typeof matcher === "string") {
const match = matcher.match(selectorReg);
if (match) {
matcher = {};
const tag = match[1];
const id = match[2];
const className = match[3];
const attrs = match[4];
let attributes;
if (tag) {
matcher.tag = tag;
}
if (attrs) {
attributes = expandAttributes(attrs);
} else if (id || className) {
attributes = {};
}
if (id) {
attributes.id = id;
}
if (className) {
attributes.class = new RegExp(getCombinations(className.split(".")).map((order) => {
return "(?:^|\\s)" + order.join("\\s(?:.*?\\s)?") + "(?:\\s|$)";
}).join("|"));
}
if (attributes) {
matcher.attrs = attributes;
}
} else {
matcher = {tag: matcher};
}
}
return matcher;
}
function cssAttrToRegExp(value, operator) {
let reg;
switch (operator) {
case "~":
reg = "(?:^|\\s)" + value + "(?:\\s|$)";
break;
case "|":
reg = "^" + value + "(?:-|$)";
break;
case "^":
reg = "^" + value;
break;
case "$":
reg = value + "$";
break;
case "*":
reg = value;
break;
case "!":
reg = "^((?!" + value + ")[\\s\\S])*$";
break;
default:
reg = "^" + value + "$";
break;
}
return new RegExp(reg);
}
function expandAttributes(attrs) {
attrs = attrs.slice(1, -1);
if (attrs.length > 0) {
attrs = attrs.split("][");
const attrObject = {};
let l = attrs.length;
let attrMatch;
let name;
let operator;
let value;
while (l--) {
attrMatch = attrs[l].match(attributeReg);
if (attrMatch) {
name = attrMatch[1];
operator = attrMatch[2];
value = attrMatch[3];
if (!value) {
value = true;
}
attrObject[name] = (operator) ? cssAttrToRegExp(value, operator) : value;
}
}
return attrObject;
}
}
function getCombinations(values, subresult) {
subresult = subresult || [];
let result = [];
for (const value of values) {
if (subresult.indexOf(value) < 0) {
const _subresult = subresult.concat([value]);
if (_subresult.length < values.length) {
result = result.concat(getCombinations(values, _subresult));
} else {
result.push(_subresult);
}
}
}
return result;
}
export default function (matcher) {
if (typeof matcher === "string") {
if (matcher.match(splitReg)) {
matcher = matcher.split(splitReg);
} else {
return expandMatcher(matcher);
}
}
if (Array.isArray(matcher)) {
return matcher.map(expandMatcher);
}
return matcher;
}
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