@angular/cdk
Version:
Angular Material Component Development Kit
64 lines • 8.6 kB
JavaScript
;
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.getStartOffsetOfAttribute = exports.findAttributeOnElementWithAttrs = exports.findAttributeOnElementWithTag = exports.findElementsWithAttribute = void 0;
const parse5_1 = require("parse5");
/**
* Parses a HTML fragment and traverses all AST nodes in order find elements that
* include the specified attribute.
*/
function findElementsWithAttribute(html, attributeName) {
const document = (0, parse5_1.parseFragment)(html, { sourceCodeLocationInfo: true });
const elements = [];
const visitNodes = (nodes) => {
nodes.forEach(n => {
var _a;
const node = n;
if (node.childNodes) {
visitNodes(node.childNodes);
}
if ((_a = node.attrs) === null || _a === void 0 ? void 0 : _a.some(attr => attr.name === attributeName.toLowerCase())) {
elements.push(node);
}
});
};
visitNodes(document.childNodes);
return elements;
}
exports.findElementsWithAttribute = findElementsWithAttribute;
/**
* Finds elements with explicit tag names that also contain the specified attribute. Returns the
* attribute start offset based on the specified HTML.
*/
function findAttributeOnElementWithTag(html, name, tagNames) {
return findElementsWithAttribute(html, name)
.filter(element => tagNames.includes(element.tagName))
.map(element => getStartOffsetOfAttribute(element, name));
}
exports.findAttributeOnElementWithTag = findAttributeOnElementWithTag;
/**
* Finds elements that contain the given attribute and contain at least one of the other
* specified attributes. Returns the primary attribute's start offset based on the specified HTML.
*/
function findAttributeOnElementWithAttrs(html, name, attrs) {
return findElementsWithAttribute(html, name)
.filter(element => attrs.some(attr => hasElementAttribute(element, attr)))
.map(element => getStartOffsetOfAttribute(element, name));
}
exports.findAttributeOnElementWithAttrs = findAttributeOnElementWithAttrs;
/** Shorthand function that checks if the specified element contains the given attribute. */
function hasElementAttribute(element, attributeName) {
return element.attrs && element.attrs.some(attr => attr.name === attributeName.toLowerCase());
}
/** Gets the start offset of the given attribute from a Parse5 element. */
function getStartOffsetOfAttribute(element, attributeName) {
return element.sourceCodeLocation.attrs[attributeName.toLowerCase()].startOffset;
}
exports.getStartOffsetOfAttribute = getStartOffsetOfAttribute;
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