schematics-utilities
Version:
🛠️ Useful exported utilities for working with Schematics
52 lines • 2.3 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 });
const schematics_1 = require("@angular-devkit/schematics");
const parse5_element_1 = require("./parse5-element");
const parse5_1 = require("parse5");
/** Appends the given element HTML fragment to the `<head>` element of the specified HTML file. */
function appendHtmlElementToHead(host, htmlFilePath, elementHtml) {
const htmlFileBuffer = host.read(htmlFilePath);
if (!htmlFileBuffer) {
throw new schematics_1.SchematicsException(`Could not read file for path: ${htmlFilePath}`);
}
const htmlContent = htmlFileBuffer.toString();
if (htmlContent.includes(elementHtml)) {
return;
}
const headTag = getHtmlHeadTagElement(htmlContent);
if (!headTag) {
throw `Could not find '<head>' element in HTML file: ${htmlFileBuffer}`;
}
// We always have access to the source code location here because the `getHeadTagElement`
// function explicitly has the `sourceCodeLocationInfo` option enabled.
const endTagOffset = headTag.sourceCodeLocation.endTag.startOffset;
const indentationOffset = parse5_element_1.getChildElementIndentation(headTag);
const insertion = `${' '.repeat(indentationOffset)}${elementHtml}`;
const recordedChange = host.beginUpdate(htmlFilePath).insertRight(endTagOffset, `${insertion}\n`);
host.commitUpdate(recordedChange);
}
exports.appendHtmlElementToHead = appendHtmlElementToHead;
/** Parses the given HTML file and returns the head element if available. */
function getHtmlHeadTagElement(htmlContent) {
const document = parse5_1.parse(htmlContent, { sourceCodeLocationInfo: true });
const nodeQueue = [...document.childNodes];
while (nodeQueue.length) {
const node = nodeQueue.shift();
if (node.nodeName.toLowerCase() === 'head') {
return node;
}
else if (node.childNodes) {
nodeQueue.push(...node.childNodes);
}
}
return null;
}
exports.getHtmlHeadTagElement = getHtmlHeadTagElement;
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