diff options
Diffstat (limited to 'themes/hugo-theme-stack/assets/ts/search.tsx')
| -rw-r--r-- | themes/hugo-theme-stack/assets/ts/search.tsx | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/themes/hugo-theme-stack/assets/ts/search.tsx b/themes/hugo-theme-stack/assets/ts/search.tsx deleted file mode 100644 index 1c81dd1..0000000 --- a/themes/hugo-theme-stack/assets/ts/search.tsx +++ /dev/null @@ -1,333 +0,0 @@ -interface pageData { - title: string, - date: string, - permalink: string, - content: string, - image?: string, - preview: string, - matchCount: number -} - -interface match { - start: number, - end: number -} - -/** - * Escape HTML tags as HTML entities - * Edited from: - * @link https://stackoverflow.com/a/5499821 - */ -const tagsToReplace = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - '…': '…' -}; - -function replaceTag(tag) { - return tagsToReplace[tag] || tag; -} - -function replaceHTMLEnt(str) { - return str.replace(/[&<>"]/g, replaceTag); -} - -function escapeRegExp(string) { - return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&'); -} - -class Search { - private data: pageData[]; - private form: HTMLFormElement; - private input: HTMLInputElement; - private list: HTMLDivElement; - private resultTitle: HTMLHeadElement; - private resultTitleTemplate: string; - - constructor({ form, input, list, resultTitle, resultTitleTemplate }) { - this.form = form; - this.input = input; - this.list = list; - this.resultTitle = resultTitle; - this.resultTitleTemplate = resultTitleTemplate; - - /// Check if there's already value in the search input - if (this.input.value.trim() !== '') { - this.doSearch(this.input.value.split(' ')); - } - else { - this.handleQueryString(); - } - - this.bindQueryStringChange(); - this.bindSearchForm(); - } - - /** - * Processes search matches - * @param str original text - * @param matches array of matches - * @param ellipsis whether to add ellipsis to the end of each match - * @param charLimit max length of preview string - * @param offset how many characters before and after the match to include in preview - * @returns preview string - */ - private static processMatches(str: string, matches: match[], ellipsis: boolean = true, charLimit = 140, offset = 20): string { - matches.sort((a, b) => { - return a.start - b.start; - }); - - let i = 0, - lastIndex = 0, - charCount = 0; - - const resultArray: string[] = []; - - while (i < matches.length) { - const item = matches[i]; - - /// item.start >= lastIndex (equal only for the first iteration) - /// because of the while loop that comes after, iterating over variable j - - if (ellipsis && item.start - offset > lastIndex) { - resultArray.push(`${replaceHTMLEnt(str.substring(lastIndex, lastIndex + offset))} [...] `); - resultArray.push(`${replaceHTMLEnt(str.substring(item.start - offset, item.start))}`); - charCount += offset * 2; - } - else { - /// If the match is too close to the end of last match, don't add ellipsis - resultArray.push(replaceHTMLEnt(str.substring(lastIndex, item.start))); - charCount += item.start - lastIndex; - } - - let j = i + 1, - end = item.end; - - /// Include as many matches as possible - /// [item.start, end] is the range of the match - while (j < matches.length && matches[j].start <= end) { - end = Math.max(matches[j].end, end); - ++j; - } - - resultArray.push(`<mark>${replaceHTMLEnt(str.substring(item.start, end))}</mark>`); - charCount += end - item.start; - - i = j; - lastIndex = end; - - if (ellipsis && charCount > charLimit) break; - } - - /// Add the rest of the string - if (lastIndex < str.length) { - let end = str.length; - if (ellipsis) end = Math.min(end, lastIndex + offset); - - resultArray.push(`${replaceHTMLEnt(str.substring(lastIndex, end))}`); - - if (ellipsis && end != str.length) { - resultArray.push(` [...]`); - } - } - - return resultArray.join(''); - } - - private async searchKeywords(keywords: string[]) { - const rawData = await this.getData(); - const results: pageData[] = []; - - const regex = new RegExp(keywords.filter((v, index, arr) => { - arr[index] = escapeRegExp(v); - return v.trim() !== ''; - }).join('|'), 'gi'); - - for (const item of rawData) { - const titleMatches: match[] = [], - contentMatches: match[] = []; - - let result = { - ...item, - preview: '', - matchCount: 0 - } - - const contentMatchAll = item.content.matchAll(regex); - for (const match of Array.from(contentMatchAll)) { - contentMatches.push({ - start: match.index, - end: match.index + match[0].length - }); - } - - const titleMatchAll = item.title.matchAll(regex); - for (const match of Array.from(titleMatchAll)) { - titleMatches.push({ - start: match.index, - end: match.index + match[0].length - }); - } - - if (titleMatches.length > 0) result.title = Search.processMatches(result.title, titleMatches, false); - if (contentMatches.length > 0) { - result.preview = Search.processMatches(result.content, contentMatches); - } - else { - /// If there are no matches in the content, use the first 140 characters as preview - result.preview = replaceHTMLEnt(result.content.substring(0, 140)); - } - - result.matchCount = titleMatches.length + contentMatches.length; - if (result.matchCount > 0) results.push(result); - } - - /// Result with more matches appears first - return results.sort((a, b) => { - return b.matchCount - a.matchCount; - }); - } - - private async doSearch(keywords: string[]) { - const startTime = performance.now(); - - const results = await this.searchKeywords(keywords); - this.clear(); - - for (const item of results) { - this.list.append(Search.render(item)); - } - - const endTime = performance.now(); - - this.resultTitle.innerText = this.generateResultTitle(results.length, ((endTime - startTime) / 1000).toPrecision(1)); - } - - private generateResultTitle(resultLen, time) { - return this.resultTitleTemplate.replace("#PAGES_COUNT", resultLen).replace("#TIME_SECONDS", time); - } - - public async getData() { - if (!this.data) { - /// Not fetched yet - const jsonURL = this.form.dataset.json; - this.data = await fetch(jsonURL).then(res => res.json()); - const parser = new DOMParser(); - - for (const item of this.data) { - item.content = parser.parseFromString(item.content, 'text/html').body.innerText; - } - } - - return this.data; - } - - private bindSearchForm() { - let lastSearch = ''; - - const eventHandler = (e) => { - e.preventDefault(); - const keywords = this.input.value.trim(); - - Search.updateQueryString(keywords, true); - - if (keywords === '') { - lastSearch = ''; - return this.clear(); - } - - if (lastSearch === keywords) return; - lastSearch = keywords; - - this.doSearch(keywords.split(' ')); - } - - this.input.addEventListener('input', eventHandler); - this.input.addEventListener('compositionend', eventHandler); - } - - private clear() { - this.list.innerHTML = ''; - this.resultTitle.innerText = ''; - } - - private bindQueryStringChange() { - window.addEventListener('popstate', (e) => { - this.handleQueryString() - }) - } - - private handleQueryString() { - const pageURL = new URL(window.location.toString()); - const keywords = pageURL.searchParams.get('keyword'); - this.input.value = keywords; - - if (keywords) { - this.doSearch(keywords.split(' ')); - } - else { - this.clear() - } - } - - private static updateQueryString(keywords: string, replaceState = false) { - const pageURL = new URL(window.location.toString()); - - if (keywords === '') { - pageURL.searchParams.delete('keyword') - } - else { - pageURL.searchParams.set('keyword', keywords); - } - - if (replaceState) { - window.history.replaceState('', '', pageURL.toString()); - } - else { - window.history.pushState('', '', pageURL.toString()); - } - } - - public static render(item: pageData) { - return <article> - <a href={item.permalink}> - <div class="article-details"> - <h2 class="article-title" dangerouslySetInnerHTML={{ __html: item.title }}></h2> - <section class="article-preview" dangerouslySetInnerHTML={{ __html: item.preview }}></section> - </div> - {item.image && - <div class="article-image"> - <img src={item.image} loading="lazy" /> - </div> - } - </a> - </article>; - } -} - -declare global { - interface Window { - searchResultTitleTemplate: string; - } -} - -window.addEventListener('load', () => { - setTimeout(function () { - const searchForm = document.querySelector('.search-form') as HTMLFormElement, - searchInput = searchForm.querySelector('input') as HTMLInputElement, - searchResultList = document.querySelector('.search-result--list') as HTMLDivElement, - searchResultTitle = document.querySelector('.search-result--title') as HTMLHeadingElement; - - new Search({ - form: searchForm, - input: searchInput, - list: searchResultList, - resultTitle: searchResultTitle, - resultTitleTemplate: window.searchResultTitleTemplate - }); - }, 0); -}) - -export default Search;
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