@angular/cdk
Version:
Angular Material Component Development Kit
71 lines • 9.01 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
*/
(function (factory) {
if (typeof module === "object" && typeof module.exports === "object") {
var v = factory(require, exports);
if (v !== undefined) module.exports = v;
}
else if (typeof define === "function" && define.amd) {
define("@angular/cdk/schematics/ng-update/html-parsing/elements", ["require", "exports", "parse5"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
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 = parse5_1.parseFragment(html, { sourceCodeLocationInfo: true });
const elements = [];
const visitNodes = nodes => {
nodes.forEach(node => {
if (node.childNodes) {
visitNodes(node.childNodes);
}
if (node.attrs && node.attrs.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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