76 lines
2.2 KiB
JavaScript
76 lines
2.2 KiB
JavaScript
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import {mergeObject} from "../../utils/helpers.mjs";
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// A list of tag names that are considered allowable inside a node that only supports inline content.
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const INLINE_TAGS = new Set(["A", "EM", "I", "STRONG", "B", "CODE", "U", "S", "DEL", "SUP", "SUB", "SPAN"]);
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/**
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* Determine if an HTML element contains purely inline content, i.e. only text nodes and 'mark' elements.
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* @param {HTMLElement} element The element.
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* @returns {boolean}
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*/
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export function onlyInlineContent(element) {
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for ( const child of element.children ) {
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if ( !INLINE_TAGS.has(child.tagName) ) return false;
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}
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return true;
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}
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/* -------------------------------------------- */
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/**
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* Determine if an HTML element is empty.
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* @param {HTMLElement} element The element.
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* @returns {boolean}
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*/
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export function isElementEmpty(element) {
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return !element.childNodes.length;
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}
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/* -------------------------------------------- */
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/**
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* Convert an element's style attribute string into an object.
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* @param {string} str The style string.
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* @returns {object}
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*/
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export function stylesFromString(str) {
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return Object.fromEntries(str.split(/;\s*/g).map(prop => prop.split(/:\s*/)));
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}
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/* -------------------------------------------- */
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/**
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* Merge two style attribute strings.
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* @param {string} a The first style string.
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* @param {string} b The second style string.
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* @returns {string}
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*/
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export function mergeStyle(a, b) {
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const allStyles = mergeObject(stylesFromString(a), stylesFromString(b));
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return Object.entries(allStyles).map(([k, v]) => v ? `${k}: ${v}` : null).filterJoin("; ");
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}
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/* -------------------------------------------- */
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/**
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* Convert an element's class attribute string into an array of class names.
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* @param {string} str The class string.
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* @returns {string[]}
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*/
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export function classesFromString(str) {
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return str.split(/\s+/g);
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}
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/* -------------------------------------------- */
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/**
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* Merge two class attribute strings.
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* @param {string} a The first class string.
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* @param {string} b The second class string.
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* @returns {string}
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*/
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export function mergeClass(a, b) {
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const allClasses = classesFromString(a).concat(classesFromString(b));
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return Array.from(new Set(allClasses)).join(" ");
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}
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