/
DOMStringMap-impl.js
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/
DOMStringMap-impl.js
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"use strict";
const idlUtils = require("../generated/utils.js");
const { setAttributeValue, removeAttributeByName } = require("../attributes");
const validateName = require("../helpers/validate-names").name;
const DOMException = require("domexception");
const { wrapWithCEReactions } = require("../helpers/ce-reactions");
const dataAttrRe = /^data-([^A-Z]*)$/;
function attrCamelCase(name) {
return name.replace(/-([a-z])/g, (match, alpha) => alpha.toUpperCase());
}
function attrSnakeCase(name) {
return name.replace(/[A-Z]/g, match => `-${match.toLowerCase()}`);
}
class DOMStringMapImpl {
constructor(args, privateData) {
this._element = privateData.element;
}
get [idlUtils.supportedPropertyNames]() {
const result = new Set();
const { attributes } = this._element;
for (let i = 0; i < attributes.length; i++) {
const attr = attributes.item(i);
const matches = dataAttrRe.exec(attr.localName);
if (matches) {
result.add(attrCamelCase(matches[1]));
}
}
return result;
}
[idlUtils.namedGet](name) {
const { attributes } = this._element;
for (let i = 0; i < attributes.length; i++) {
const attr = attributes.item(i);
const matches = dataAttrRe.exec(attr.localName);
if (matches && attrCamelCase(matches[1]) === name) {
return attr.value;
}
}
return undefined;
}
[idlUtils.namedSetNew](name, value) {
if (/-[a-z]/.test(name)) {
throw new DOMException(`'${name}' is not a valid property name`, "SyntaxError");
}
name = `data-${attrSnakeCase(name)}`;
validateName(name);
setAttributeValue(this._element, name, value);
}
[idlUtils.namedSetExisting](name, value) {
this[idlUtils.namedSetNew](name, value);
}
[idlUtils.namedDelete](name) {
name = `data-${attrSnakeCase(name)}`;
removeAttributeByName(this._element, name);
}
}
// TODO: This is poor work-around to make [CEReactions] work with interfaces using proxies.
// Instead of patching the interfaces, in those cases we patch directly the class impl
DOMStringMapImpl.prototype[idlUtils.namedSetNew] =
wrapWithCEReactions(DOMStringMapImpl.prototype[idlUtils.namedSetNew]);
DOMStringMapImpl.prototype[idlUtils.namedSetExisting] =
wrapWithCEReactions(DOMStringMapImpl.prototype[idlUtils.namedSetExisting]);
DOMStringMapImpl.prototype[idlUtils.namedDelete] =
wrapWithCEReactions(DOMStringMapImpl.prototype[idlUtils.namedDelete]);
exports.implementation = DOMStringMapImpl;