465 lines
16 KiB
TypeScript
465 lines
16 KiB
TypeScript
import FlexSearch from "flexsearch"
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import { ContentDetails } from "../../plugins/emitters/contentIndex"
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import { registerEscapeHandler, removeAllChildren } from "./util"
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import { FullSlug, normalizeRelativeURLs, resolveRelative } from "../../util/path"
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interface Item {
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id: number
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slug: FullSlug
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title: string
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content: string
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tags: string[]
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}
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// Can be expanded with things like "term" in the future
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type SearchType = "basic" | "tags"
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let searchType: SearchType = "basic"
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let currentSearchTerm: string = ""
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const encoder = (str: string) => str.toLowerCase().split(/([^a-z]|[^\x00-\x7F])/)
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let index = new FlexSearch.Document<Item>({
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charset: "latin:extra",
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encode: encoder,
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document: {
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id: "id",
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index: [
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{
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field: "title",
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tokenize: "forward",
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},
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{
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field: "content",
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tokenize: "forward",
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},
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{
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field: "tags",
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tokenize: "forward",
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},
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],
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},
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})
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const p = new DOMParser()
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const fetchContentCache: Map<FullSlug, Element[]> = new Map()
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const contextWindowWords = 30
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const numSearchResults = 8
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const numTagResults = 5
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const tokenizeTerm = (term: string) => {
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const tokens = term.split(/\s+/).filter((t) => t.trim() !== "")
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const tokenLen = tokens.length
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if (tokenLen > 1) {
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for (let i = 1; i < tokenLen; i++) {
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tokens.push(tokens.slice(0, i + 1).join(" "))
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}
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}
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return tokens.sort((a, b) => b.length - a.length) // always highlight longest terms first
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}
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function highlight(searchTerm: string, text: string, trim?: boolean) {
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const tokenizedTerms = tokenizeTerm(searchTerm)
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let tokenizedText = text.split(/\s+/).filter((t) => t !== "")
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let startIndex = 0
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let endIndex = tokenizedText.length - 1
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if (trim) {
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const includesCheck = (tok: string) =>
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tokenizedTerms.some((term) => tok.toLowerCase().startsWith(term.toLowerCase()))
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const occurrencesIndices = tokenizedText.map(includesCheck)
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let bestSum = 0
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let bestIndex = 0
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for (let i = 0; i < Math.max(tokenizedText.length - contextWindowWords, 0); i++) {
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const window = occurrencesIndices.slice(i, i + contextWindowWords)
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const windowSum = window.reduce((total, cur) => total + (cur ? 1 : 0), 0)
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if (windowSum >= bestSum) {
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bestSum = windowSum
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bestIndex = i
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}
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}
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startIndex = Math.max(bestIndex - contextWindowWords, 0)
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endIndex = Math.min(startIndex + 2 * contextWindowWords, tokenizedText.length - 1)
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tokenizedText = tokenizedText.slice(startIndex, endIndex)
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}
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const slice = tokenizedText
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.map((tok) => {
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// see if this tok is prefixed by any search terms
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for (const searchTok of tokenizedTerms) {
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if (tok.toLowerCase().includes(searchTok.toLowerCase())) {
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const regex = new RegExp(searchTok.toLowerCase(), "gi")
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return tok.replace(regex, `<span class="highlight">$&</span>`)
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}
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}
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return tok
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})
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.join(" ")
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return `${startIndex === 0 ? "" : "..."}${slice}${
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endIndex === tokenizedText.length - 1 ? "" : "..."
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}`
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}
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function highlightHTML(searchTerm: string, el: HTMLElement) {
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const p = new DOMParser()
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const tokenizedTerms = tokenizeTerm(searchTerm)
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const html = p.parseFromString(el.innerHTML, "text/html")
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const createHighlightSpan = (text: string) => {
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const span = document.createElement("span")
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span.className = "highlight"
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span.textContent = text
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return span
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}
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const highlightTextNodes = (node: Node, term: string) => {
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if (node.nodeType === Node.TEXT_NODE) {
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const nodeText = node.nodeValue ?? ""
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const regex = new RegExp(term.toLowerCase(), "gi")
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const matches = nodeText.match(regex)
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if (!matches || matches.length === 0) return
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const spanContainer = document.createElement("span")
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let lastIndex = 0
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for (const match of matches) {
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const matchIndex = nodeText.indexOf(match, lastIndex)
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spanContainer.appendChild(document.createTextNode(nodeText.slice(lastIndex, matchIndex)))
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spanContainer.appendChild(createHighlightSpan(match))
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lastIndex = matchIndex + match.length
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}
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spanContainer.appendChild(document.createTextNode(nodeText.slice(lastIndex)))
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node.parentNode?.replaceChild(spanContainer, node)
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} else if (node.nodeType === Node.ELEMENT_NODE) {
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if ((node as HTMLElement).classList.contains("highlight")) return
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Array.from(node.childNodes).forEach((child) => highlightTextNodes(child, term))
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}
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}
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for (const term of tokenizedTerms) {
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highlightTextNodes(html.body, term)
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}
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return html.body
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}
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document.addEventListener("nav", async (e: CustomEventMap["nav"]) => {
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const currentSlug = e.detail.url
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const data = await fetchData
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const container = document.getElementById("search-container")
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const sidebar = container?.closest(".sidebar") as HTMLElement
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const searchIcon = document.getElementById("search-icon")
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const searchBar = document.getElementById("search-bar") as HTMLInputElement | null
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const searchLayout = document.getElementById("search-layout")
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const idDataMap = Object.keys(data) as FullSlug[]
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const appendLayout = (el: HTMLElement) => {
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if (searchLayout?.querySelector(`#${el.id}`) === null) {
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searchLayout?.appendChild(el)
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}
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}
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const enablePreview = searchLayout?.dataset?.preview === "true"
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let preview: HTMLDivElement | undefined = undefined
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let previewInner: HTMLDivElement | undefined = undefined
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const results = document.createElement("div")
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results.id = "results-container"
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results.style.flexBasis = enablePreview ? "min(30%, 450px)" : "100%"
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appendLayout(results)
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if (enablePreview) {
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preview = document.createElement("div")
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preview.id = "preview-container"
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preview.style.flexBasis = "100%"
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appendLayout(preview)
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}
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function hideSearch() {
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container?.classList.remove("active")
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if (searchBar) {
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searchBar.value = "" // clear the input when we dismiss the search
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}
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if (sidebar) {
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sidebar.style.zIndex = "unset"
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}
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if (results) {
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removeAllChildren(results)
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}
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if (preview) {
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removeAllChildren(preview)
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}
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if (searchLayout) {
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searchLayout.classList.remove("display-results")
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}
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searchType = "basic" // reset search type after closing
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}
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function showSearch(searchTypeNew: SearchType) {
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searchType = searchTypeNew
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if (sidebar) {
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sidebar.style.zIndex = "1"
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}
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container?.classList.add("active")
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searchBar?.focus()
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}
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let currentHover: HTMLInputElement | null = null
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async function shortcutHandler(e: HTMLElementEventMap["keydown"]) {
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if (e.key === "k" && (e.ctrlKey || e.metaKey) && !e.shiftKey) {
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e.preventDefault()
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const searchBarOpen = container?.classList.contains("active")
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searchBarOpen ? hideSearch() : showSearch("basic")
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return
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} else if (e.shiftKey && (e.ctrlKey || e.metaKey) && e.key.toLowerCase() === "k") {
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// Hotkey to open tag search
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e.preventDefault()
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const searchBarOpen = container?.classList.contains("active")
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searchBarOpen ? hideSearch() : showSearch("tags")
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// add "#" prefix for tag search
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if (searchBar) searchBar.value = "#"
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return
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}
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if (currentHover) {
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currentHover.classList.remove("focus")
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}
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// If search is active, then we will render the first result and display accordingly
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if (!container?.classList.contains("active")) return
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if (e.key === "Enter") {
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// If result has focus, navigate to that one, otherwise pick first result
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if (results?.contains(document.activeElement)) {
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const active = document.activeElement as HTMLInputElement
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if (active.classList.contains("no-match")) return
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await displayPreview(active)
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active.click()
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} else {
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const anchor = document.getElementsByClassName("result-card")[0] as HTMLInputElement | null
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if (!anchor || anchor?.classList.contains("no-match")) return
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await displayPreview(anchor)
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anchor.click()
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}
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} else if (e.key === "ArrowUp" || (e.shiftKey && e.key === "Tab")) {
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e.preventDefault()
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if (results?.contains(document.activeElement)) {
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// If an element in results-container already has focus, focus previous one
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const currentResult = currentHover
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? currentHover
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: (document.activeElement as HTMLInputElement | null)
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const prevResult = currentResult?.previousElementSibling as HTMLInputElement | null
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currentResult?.classList.remove("focus")
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prevResult?.focus()
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if (prevResult) currentHover = prevResult
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await displayPreview(prevResult)
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}
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} else if (e.key === "ArrowDown" || e.key === "Tab") {
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e.preventDefault()
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// The results should already been focused, so we need to find the next one.
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// The activeElement is the search bar, so we need to find the first result and focus it.
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if (document.activeElement === searchBar || currentHover !== null) {
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const firstResult = currentHover
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? currentHover
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: (document.getElementsByClassName("result-card")[0] as HTMLInputElement | null)
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const secondResult = firstResult?.nextElementSibling as HTMLInputElement | null
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firstResult?.classList.remove("focus")
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secondResult?.focus()
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if (secondResult) currentHover = secondResult
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await displayPreview(secondResult)
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}
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}
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}
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const formatForDisplay = (term: string, id: number) => {
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const slug = idDataMap[id]
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return {
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id,
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slug,
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title: searchType === "tags" ? data[slug].title : highlight(term, data[slug].title ?? ""),
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content: highlight(term, data[slug].content ?? "", true),
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tags: highlightTags(term.substring(1), data[slug].tags),
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}
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}
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function highlightTags(term: string, tags: string[]) {
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if (!tags || searchType !== "tags") {
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return []
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}
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return tags
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.map((tag) => {
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if (tag.toLowerCase().includes(term.toLowerCase())) {
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return `<li><p class="match-tag">#${tag}</p></li>`
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} else {
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return `<li><p>#${tag}</p></li>`
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}
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})
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.slice(0, numTagResults)
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}
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function resolveUrl(slug: FullSlug): URL {
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return new URL(resolveRelative(currentSlug, slug), location.toString())
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}
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const resultToHTML = ({ slug, title, content, tags }: Item) => {
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const htmlTags = tags.length > 0 ? `<ul class="tags">${tags.join("")}</ul>` : ``
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const itemTile = document.createElement("a")
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itemTile.classList.add("result-card")
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itemTile.id = slug
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itemTile.href = resolveUrl(slug).toString()
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itemTile.innerHTML = `<h3>${title}</h3>${htmlTags}<p class="preview">${content}</p>`
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const handler = (event: MouseEvent) => {
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if (event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) return
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hideSearch()
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}
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async function onMouseEnter(ev: MouseEvent) {
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if (!ev.target) return
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const target = ev.target as HTMLInputElement
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await displayPreview(target)
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}
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itemTile.addEventListener("mouseenter", onMouseEnter)
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window.addCleanup(() => itemTile.removeEventListener("mouseenter", onMouseEnter))
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itemTile.addEventListener("click", handler)
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window.addCleanup(() => itemTile.removeEventListener("click", handler))
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return itemTile
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}
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async function displayResults(finalResults: Item[]) {
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if (!results) return
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removeAllChildren(results)
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if (finalResults.length === 0) {
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results.innerHTML = `<a class="result-card no-match">
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<h3>No results.</h3>
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<p>Try another search term?</p>
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</a>`
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} else {
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results.append(...finalResults.map(resultToHTML))
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}
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if (finalResults.length === 0 && preview) {
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// no results, clear previous preview
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removeAllChildren(preview)
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} else {
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// focus on first result, then also dispatch preview immediately
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const firstChild = results.firstElementChild as HTMLElement
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firstChild.classList.add("focus")
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currentHover = firstChild as HTMLInputElement
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await displayPreview(firstChild)
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}
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}
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async function fetchContent(slug: FullSlug): Promise<Element[]> {
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if (fetchContentCache.has(slug)) {
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return fetchContentCache.get(slug) as Element[]
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}
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const targetUrl = resolveUrl(slug).toString()
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const contents = await fetch(targetUrl)
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.then((res) => res.text())
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.then((contents) => {
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if (contents === undefined) {
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throw new Error(`Could not fetch ${targetUrl}`)
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}
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const html = p.parseFromString(contents ?? "", "text/html")
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normalizeRelativeURLs(html, targetUrl)
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return [...html.getElementsByClassName("popover-hint")]
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})
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fetchContentCache.set(slug, contents)
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return contents
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}
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async function displayPreview(el: HTMLElement | null) {
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if (!searchLayout || !enablePreview || !el || !preview) return
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const slug = el.id as FullSlug
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const innerDiv = await fetchContent(slug).then((contents) =>
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contents.flatMap((el) => [...highlightHTML(currentSearchTerm, el as HTMLElement).children]),
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)
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previewInner = document.createElement("div")
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previewInner.classList.add("preview-inner")
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previewInner.append(...innerDiv)
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preview.replaceChildren(previewInner)
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// scroll to longest
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const highlights = [...preview.querySelectorAll(".highlight")].sort(
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(a, b) => b.innerHTML.length - a.innerHTML.length,
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)
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highlights[0]?.scrollIntoView({ block: "start" })
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}
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async function onType(e: HTMLElementEventMap["input"]) {
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if (!searchLayout || !index) return
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currentSearchTerm = (e.target as HTMLInputElement).value
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searchLayout.classList.toggle("display-results", currentSearchTerm !== "")
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searchType = currentSearchTerm.startsWith("#") ? "tags" : "basic"
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let searchResults: FlexSearch.SimpleDocumentSearchResultSetUnit[]
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if (searchType === "tags") {
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searchResults = await index.searchAsync({
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query: currentSearchTerm.substring(1),
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limit: numSearchResults,
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index: ["tags"],
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})
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} else if (searchType === "basic") {
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searchResults = await index.searchAsync({
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query: currentSearchTerm,
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limit: numSearchResults,
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index: ["title", "content"],
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})
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}
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const getByField = (field: string): number[] => {
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const results = searchResults.filter((x) => x.field === field)
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return results.length === 0 ? [] : ([...results[0].result] as number[])
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}
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// order titles ahead of content
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const allIds: Set<number> = new Set([
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...getByField("title"),
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...getByField("content"),
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...getByField("tags"),
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])
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const finalResults = [...allIds].map((id) => formatForDisplay(currentSearchTerm, id))
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await displayResults(finalResults)
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}
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document.addEventListener("keydown", shortcutHandler)
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window.addCleanup(() => document.removeEventListener("keydown", shortcutHandler))
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searchIcon?.addEventListener("click", () => showSearch("basic"))
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window.addCleanup(() => searchIcon?.removeEventListener("click", () => showSearch("basic")))
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searchBar?.addEventListener("input", onType)
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window.addCleanup(() => searchBar?.removeEventListener("input", onType))
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registerEscapeHandler(container, hideSearch)
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await fillDocument(data)
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})
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/**
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* Fills flexsearch document with data
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* @param index index to fill
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* @param data data to fill index with
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*/
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async function fillDocument(data: { [key: FullSlug]: ContentDetails }) {
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let id = 0
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const promises: Array<Promise<unknown>> = []
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for (const [slug, fileData] of Object.entries<ContentDetails>(data)) {
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promises.push(
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index.addAsync(id++, {
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id,
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slug: slug as FullSlug,
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title: fileData.title,
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content: fileData.content,
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tags: fileData.tags,
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}),
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)
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}
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return await Promise.all(promises)
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}
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