@jsenv/plugin-transpilation
Version:
80 lines (71 loc) • 2.65 kB
JavaScript
/* @minVersion 7.19.0 */
import setPrototypeOf from "../setPrototypeOf/setPrototypeOf.js";
import inherits from "../inherits/inherits.js";
export default function _wrapRegExp() {
_wrapRegExp = function (re, groups) {
return new BabelRegExp(re, undefined, groups);
};
var _super = RegExp.prototype;
var _groups = new WeakMap();
function BabelRegExp(re, flags, groups) {
var _this = new RegExp(re, flags);
// if the regex is recreated with 'g' flag
_groups.set(_this, groups || _groups.get(re));
return setPrototypeOf(_this, BabelRegExp.prototype);
}
inherits(BabelRegExp, RegExp);
BabelRegExp.prototype.exec = function (str) {
var result = _super.exec.call(this, str);
if (result) {
result.groups = buildGroups(result, this);
var indices = result.indices;
if (indices) indices.groups = buildGroups(indices, this);
}
return result;
};
BabelRegExp.prototype[Symbol.replace] = function (str, substitution) {
if (typeof substitution === "string") {
var groups = _groups.get(this);
return _super[Symbol.replace].call(
this,
str,
substitution.replace(/\$<([^>]+)>/g, function (_, name) {
var group = groups[name];
return "$" + (Array.isArray(group) ? group.join("$") : group);
}),
);
} else if (typeof substitution === "function") {
var _this = this;
return _super[Symbol.replace].call(this, str, function () {
var args = arguments;
// Modern engines already pass result.groups returned by exec() as the last arg.
if (typeof args[args.length - 1] !== "object") {
args = [].slice.call(args);
args.push(buildGroups(args, _this));
}
return substitution.apply(this, args);
});
} else {
return _super[Symbol.replace].call(this, str, substitution);
}
};
function buildGroups(result, re) {
// NOTE: This function should return undefined if there are no groups,
// but in that case Babel doesn't add the wrapper anyway.
var g = _groups.get(re);
return Object.keys(g).reduce(function (groups, name) {
var i = g[name];
if (typeof i === "number") groups[name] = result[i];
else {
// i is an array of indexes
var k = 0;
// if no group matched, we stop at k = i.length - 1 and then
// we store result[i[i.length - 1]] which is undefined.
while (result[i[k]] === undefined && k + 1 < i.length) k++;
groups[name] = result[i[k]];
}
return groups;
}, Object.create(null));
}
return _wrapRegExp.apply(this, arguments);
}