365 lines
12 KiB
JavaScript
365 lines
12 KiB
JavaScript
/**
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* Refer to hexo-generator-searchdb
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* https://github.com/next-theme/hexo-generator-searchdb/blob/main/dist/search.js
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* Modified by hexo-theme-butterfly
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*/
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class LocalSearch {
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constructor ({
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path = '',
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unescape = false,
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top_n_per_article = 1
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}) {
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this.path = path
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this.unescape = unescape
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this.top_n_per_article = top_n_per_article
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this.isfetched = false
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this.datas = null
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}
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getIndexByWord (words, text, caseSensitive = false) {
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const index = []
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const included = new Set()
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if (!caseSensitive) {
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text = text.toLowerCase()
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}
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words.forEach(word => {
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if (this.unescape) {
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const div = document.createElement('div')
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div.innerText = word
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word = div.innerHTML
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}
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const wordLen = word.length
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if (wordLen === 0) return
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let startPosition = 0
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let position = -1
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if (!caseSensitive) {
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word = word.toLowerCase()
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}
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while ((position = text.indexOf(word, startPosition)) > -1) {
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index.push({ position, word })
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included.add(word)
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startPosition = position + wordLen
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}
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})
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// Sort index by position of keyword
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index.sort((left, right) => {
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if (left.position !== right.position) {
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return left.position - right.position
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}
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return right.word.length - left.word.length
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})
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return [index, included]
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}
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// Merge hits into slices
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mergeIntoSlice (start, end, index) {
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let item = index[0]
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let { position, word } = item
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const hits = []
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const count = new Set()
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while (position + word.length <= end && index.length !== 0) {
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count.add(word)
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hits.push({
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position,
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length: word.length
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})
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const wordEnd = position + word.length
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// Move to next position of hit
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index.shift()
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while (index.length !== 0) {
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item = index[0]
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position = item.position
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word = item.word
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if (wordEnd > position) {
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index.shift()
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} else {
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break
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}
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}
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}
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return {
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hits,
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start,
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end,
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count: count.size
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}
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}
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// Highlight title and content
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highlightKeyword (val, slice) {
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let result = ''
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let index = slice.start
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for (const { position, length } of slice.hits) {
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result += val.substring(index, position)
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index = position + length
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result += `<mark class="search-keyword">${val.substr(position, length)}</mark>`
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}
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result += val.substring(index, slice.end)
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return result
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}
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getResultItems (keywords) {
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const resultItems = []
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this.datas.forEach(({ title, content, url }) => {
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// The number of different keywords included in the article.
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const [indexOfTitle, keysOfTitle] = this.getIndexByWord(keywords, title)
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const [indexOfContent, keysOfContent] = this.getIndexByWord(keywords, content)
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const includedCount = new Set([...keysOfTitle, ...keysOfContent]).size
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// Show search results
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const hitCount = indexOfTitle.length + indexOfContent.length
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if (hitCount === 0) return
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const slicesOfTitle = []
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if (indexOfTitle.length !== 0) {
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slicesOfTitle.push(this.mergeIntoSlice(0, title.length, indexOfTitle))
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}
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let slicesOfContent = []
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while (indexOfContent.length !== 0) {
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const item = indexOfContent[0]
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const { position } = item
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// Cut out 120 characters. The maxlength of .search-input is 80.
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const start = Math.max(0, position - 20)
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const end = Math.min(content.length, position + 100)
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slicesOfContent.push(this.mergeIntoSlice(start, end, indexOfContent))
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}
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// Sort slices in content by included keywords' count and hits' count
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slicesOfContent.sort((left, right) => {
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if (left.count !== right.count) {
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return right.count - left.count
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} else if (left.hits.length !== right.hits.length) {
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return right.hits.length - left.hits.length
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}
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return left.start - right.start
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})
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// Select top N slices in content
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const upperBound = parseInt(this.top_n_per_article, 10)
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if (upperBound >= 0) {
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slicesOfContent = slicesOfContent.slice(0, upperBound)
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}
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let resultItem = ''
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url = new URL(url, location.origin)
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url.searchParams.append('highlight', keywords.join(' '))
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if (slicesOfTitle.length !== 0) {
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resultItem += `<div class="local-search-hit-item"><a href="${url.href}"><span class="search-result-title">${this.highlightKeyword(title, slicesOfTitle[0])}</span>`
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} else {
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resultItem += `<div class="local-search-hit-item"><a href="${url.href}"><span class="search-result-title">${title}</span>`
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}
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slicesOfContent.forEach(slice => {
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resultItem += `<p class="search-result">${this.highlightKeyword(content, slice)}...</p></a>`
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})
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resultItem += '</div>'
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resultItems.push({
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item: resultItem,
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id: resultItems.length,
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hitCount,
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includedCount
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})
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})
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return resultItems
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}
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fetchData () {
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const isXml = !this.path.endsWith('json')
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fetch(this.path)
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.then(response => response.text())
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.then(res => {
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// Get the contents from search data
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this.isfetched = true
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this.datas = isXml
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? [...new DOMParser().parseFromString(res, 'text/xml').querySelectorAll('entry')].map(element => ({
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title: element.querySelector('title').textContent,
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content: element.querySelector('content').textContent,
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url: element.querySelector('url').textContent
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}))
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: JSON.parse(res)
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// Only match articles with non-empty titles
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this.datas = this.datas.filter(data => data.title).map(data => {
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data.title = data.title.trim()
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data.content = data.content ? data.content.trim().replace(/<[^>]+>/g, '') : ''
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data.url = decodeURIComponent(data.url).replace(/\/{2,}/g, '/')
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return data
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})
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// Remove loading animation
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window.dispatchEvent(new Event('search:loaded'))
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})
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}
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// Highlight by wrapping node in mark elements with the given class name
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highlightText (node, slice, className) {
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const val = node.nodeValue
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let index = slice.start
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const children = []
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for (const { position, length } of slice.hits) {
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const text = document.createTextNode(val.substring(index, position))
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index = position + length
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const mark = document.createElement('mark')
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mark.className = className
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mark.appendChild(document.createTextNode(val.substr(position, length)))
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children.push(text, mark)
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}
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node.nodeValue = val.substring(index, slice.end)
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children.forEach(element => {
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node.parentNode.insertBefore(element, node)
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})
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}
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// Highlight the search words provided in the url in the text
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highlightSearchWords (body) {
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const params = new URL(location.href).searchParams.get('highlight')
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const keywords = params ? params.split(' ') : []
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if (!keywords.length || !body) return
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const walk = document.createTreeWalker(body, NodeFilter.SHOW_TEXT, null)
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const allNodes = []
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while (walk.nextNode()) {
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if (!walk.currentNode.parentNode.matches('button, select, textarea, .mermaid')) allNodes.push(walk.currentNode)
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}
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allNodes.forEach(node => {
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const [indexOfNode] = this.getIndexByWord(keywords, node.nodeValue)
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if (!indexOfNode.length) return
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const slice = this.mergeIntoSlice(0, node.nodeValue.length, indexOfNode)
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this.highlightText(node, slice, 'search-keyword')
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})
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}
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}
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window.addEventListener('load', () => {
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// Search
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const { path, top_n_per_article, unescape, languages } = GLOBAL_CONFIG.localSearch
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const localSearch = new LocalSearch({
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path,
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top_n_per_article,
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unescape
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})
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const input = document.querySelector('#local-search-input input')
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const statsItem = document.getElementById('local-search-stats-wrap')
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const $loadingStatus = document.getElementById('loading-status')
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const isXml = !path.endsWith('json')
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const inputEventFunction = () => {
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if (!localSearch.isfetched) return
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let searchText = input.value.trim().toLowerCase()
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isXml && (searchText = searchText.replace(/</g, '<').replace(/>/g, '>'))
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if (searchText !== '') $loadingStatus.innerHTML = '<i class="fas fa-spinner fa-pulse"></i>'
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const keywords = searchText.split(/[-\s]+/)
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const container = document.getElementById('local-search-results')
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let resultItems = []
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if (searchText.length > 0) {
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// Perform local searching
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resultItems = localSearch.getResultItems(keywords)
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}
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if (keywords.length === 1 && keywords[0] === '') {
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container.textContent = ''
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statsItem.textContent = ''
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} else if (resultItems.length === 0) {
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container.textContent = ''
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const statsDiv = document.createElement('div')
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statsDiv.className = 'search-result-stats'
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statsDiv.textContent = languages.hits_empty.replace(/\$\{query}/, searchText)
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statsItem.innerHTML = statsDiv.outerHTML
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} else {
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resultItems.sort((left, right) => {
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if (left.includedCount !== right.includedCount) {
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return right.includedCount - left.includedCount
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} else if (left.hitCount !== right.hitCount) {
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return right.hitCount - left.hitCount
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}
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return right.id - left.id
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})
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const stats = languages.hits_stats.replace(/\$\{hits}/, resultItems.length)
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container.innerHTML = `<div class="search-result-list">${resultItems.map(result => result.item).join('')}</div>`
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statsItem.innerHTML = `<hr><div class="search-result-stats">${stats}</div>`
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window.pjax && window.pjax.refresh(container)
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}
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$loadingStatus.textContent = ''
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}
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let loadFlag = false
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const $searchMask = document.getElementById('search-mask')
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const $searchDialog = document.querySelector('#local-search .search-dialog')
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// fix safari
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const fixSafariHeight = () => {
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if (window.innerWidth < 768) {
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$searchDialog.style.setProperty('--search-height', window.innerHeight + 'px')
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}
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}
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const openSearch = () => {
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const bodyStyle = document.body.style
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bodyStyle.width = '100%'
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bodyStyle.overflow = 'hidden'
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btf.animateIn($searchMask, 'to_show 0.5s')
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btf.animateIn($searchDialog, 'titleScale 0.5s')
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setTimeout(() => { input.focus() }, 300)
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if (!loadFlag) {
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!localSearch.isfetched && localSearch.fetchData()
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input.addEventListener('input', inputEventFunction)
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loadFlag = true
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}
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// shortcut: ESC
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document.addEventListener('keydown', function f (event) {
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if (event.code === 'Escape') {
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closeSearch()
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document.removeEventListener('keydown', f)
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}
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})
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fixSafariHeight()
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window.addEventListener('resize', fixSafariHeight)
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}
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const closeSearch = () => {
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const bodyStyle = document.body.style
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bodyStyle.width = ''
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bodyStyle.overflow = ''
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btf.animateOut($searchDialog, 'search_close .5s')
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btf.animateOut($searchMask, 'to_hide 0.5s')
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window.removeEventListener('resize', fixSafariHeight)
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}
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const searchClickFn = () => {
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btf.addEventListenerPjax(document.querySelector('#search-button > .search'), 'click', openSearch)
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}
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const searchFnOnce = () => {
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document.querySelector('#local-search .search-close-button').addEventListener('click', closeSearch)
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$searchMask.addEventListener('click', closeSearch)
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if (GLOBAL_CONFIG.localSearch.preload) {
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localSearch.fetchData()
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}
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localSearch.highlightSearchWords(document.getElementById('article-container'))
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}
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window.addEventListener('search:loaded', () => {
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const $loadDataItem = document.getElementById('loading-database')
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$loadDataItem.nextElementSibling.style.display = 'block'
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$loadDataItem.remove()
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})
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searchClickFn()
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searchFnOnce()
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// pjax
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window.addEventListener('pjax:complete', () => {
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!btf.isHidden($searchMask) && closeSearch()
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localSearch.highlightSearchWords(document.getElementById('article-container'))
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searchClickFn()
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})
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})
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