site/quartz/components/scripts/search.inline.ts
2024-04-05 02:03:11 +02:00

492 lines
17 KiB
TypeScript

import FlexSearch from "flexsearch"
import { ContentDetails } from "../../plugins/emitters/contentIndex"
import { registerEscapeHandler, removeAllChildren } from "./util"
import { FullSlug, normalizeRelativeURLs, resolveRelative } from "../../util/path"
interface Item {
id: number
slug: FullSlug
title: string
content: string
tags: string[]
}
// Can be expanded with things like "term" in the future
type SearchType = "basic" | "tags"
let searchType: SearchType = "basic"
let currentSearchTerm: string = ""
const encoder = (str: string) => str.toLowerCase().split(/([^a-z]|[^\x00-\x7F])/)
let index = new FlexSearch.Document<Item>({
charset: "latin:extra",
encode: encoder,
document: {
id: "id",
tag: "tags",
index: [
{
field: "title",
tokenize: "forward",
},
{
field: "content",
tokenize: "forward",
},
{
field: "tags",
tokenize: "forward",
},
],
},
})
const p = new DOMParser()
const fetchContentCache: Map<FullSlug, Element[]> = new Map()
const contextWindowWords = 30
const numSearchResults = 8
const numTagResults = 5
const tokenizeTerm = (term: string) => {
const tokens = term.split(/\s+/).filter((t) => t.trim() !== "")
const tokenLen = tokens.length
if (tokenLen > 1) {
for (let i = 1; i < tokenLen; i++) {
tokens.push(tokens.slice(0, i + 1).join(" "))
}
}
return tokens.sort((a, b) => b.length - a.length) // always highlight longest terms first
}
function highlight(searchTerm: string, text: string, trim?: boolean) {
const tokenizedTerms = tokenizeTerm(searchTerm)
let tokenizedText = text.split(/\s+/).filter((t) => t !== "")
let startIndex = 0
let endIndex = tokenizedText.length - 1
if (trim) {
const includesCheck = (tok: string) =>
tokenizedTerms.some((term) => tok.toLowerCase().startsWith(term.toLowerCase()))
const occurrencesIndices = tokenizedText.map(includesCheck)
let bestSum = 0
let bestIndex = 0
for (let i = 0; i < Math.max(tokenizedText.length - contextWindowWords, 0); i++) {
const window = occurrencesIndices.slice(i, i + contextWindowWords)
const windowSum = window.reduce((total, cur) => total + (cur ? 1 : 0), 0)
if (windowSum >= bestSum) {
bestSum = windowSum
bestIndex = i
}
}
startIndex = Math.max(bestIndex - contextWindowWords, 0)
endIndex = Math.min(startIndex + 2 * contextWindowWords, tokenizedText.length - 1)
tokenizedText = tokenizedText.slice(startIndex, endIndex)
}
const slice = tokenizedText
.map((tok) => {
// see if this tok is prefixed by any search terms
for (const searchTok of tokenizedTerms) {
if (tok.toLowerCase().includes(searchTok.toLowerCase())) {
const regex = new RegExp(searchTok.toLowerCase(), "gi")
return tok.replace(regex, `<span class="highlight">$&</span>`)
}
}
return tok
})
.join(" ")
return `${startIndex === 0 ? "" : "..."}${slice}${
endIndex === tokenizedText.length - 1 ? "" : "..."
}`
}
function highlightHTML(searchTerm: string, el: HTMLElement) {
const p = new DOMParser()
const tokenizedTerms = tokenizeTerm(searchTerm)
const html = p.parseFromString(el.innerHTML, "text/html")
const createHighlightSpan = (text: string) => {
const span = document.createElement("span")
span.className = "highlight"
span.textContent = text
return span
}
const highlightTextNodes = (node: Node, term: string) => {
if (node.nodeType === Node.TEXT_NODE) {
const nodeText = node.nodeValue ?? ""
const regex = new RegExp(term.toLowerCase(), "gi")
const matches = nodeText.match(regex)
if (!matches || matches.length === 0) return
const spanContainer = document.createElement("span")
let lastIndex = 0
for (const match of matches) {
const matchIndex = nodeText.indexOf(match, lastIndex)
spanContainer.appendChild(document.createTextNode(nodeText.slice(lastIndex, matchIndex)))
spanContainer.appendChild(createHighlightSpan(match))
lastIndex = matchIndex + match.length
}
spanContainer.appendChild(document.createTextNode(nodeText.slice(lastIndex)))
node.parentNode?.replaceChild(spanContainer, node)
} else if (node.nodeType === Node.ELEMENT_NODE) {
if ((node as HTMLElement).classList.contains("highlight")) return
Array.from(node.childNodes).forEach((child) => highlightTextNodes(child, term))
}
}
for (const term of tokenizedTerms) {
highlightTextNodes(html.body, term)
}
return html.body
}
document.addEventListener("nav", async (e: CustomEventMap["nav"]) => {
const currentSlug = e.detail.url
const data = await fetchData
const container = document.getElementById("search-container")
const sidebar = container?.closest(".sidebar") as HTMLElement
const searchIcon = document.getElementById("search-icon")
const searchBar = document.getElementById("search-bar") as HTMLInputElement | null
const searchLayout = document.getElementById("search-layout")
const idDataMap = Object.keys(data) as FullSlug[]
const appendLayout = (el: HTMLElement) => {
if (searchLayout?.querySelector(`#${el.id}`) === null) {
searchLayout?.appendChild(el)
}
}
const enablePreview = searchLayout?.dataset?.preview === "true"
let preview: HTMLDivElement | undefined = undefined
let previewInner: HTMLDivElement | undefined = undefined
const results = document.createElement("div")
results.id = "results-container"
appendLayout(results)
if (enablePreview) {
preview = document.createElement("div")
preview.id = "preview-container"
appendLayout(preview)
}
function hideSearch() {
container?.classList.remove("active")
if (searchBar) {
searchBar.value = "" // clear the input when we dismiss the search
}
if (sidebar) {
sidebar.style.zIndex = "unset"
}
if (results) {
removeAllChildren(results)
}
if (preview) {
removeAllChildren(preview)
}
if (searchLayout) {
searchLayout.classList.remove("display-results")
}
searchType = "basic" // reset search type after closing
}
function showSearch(searchTypeNew: SearchType) {
searchType = searchTypeNew
if (sidebar) {
sidebar.style.zIndex = "1"
}
container?.classList.add("active")
searchBar?.focus()
}
let currentHover: HTMLInputElement | null = null
async function shortcutHandler(e: HTMLElementEventMap["keydown"]) {
if (e.key === "k" && (e.ctrlKey || e.metaKey) && !e.shiftKey) {
e.preventDefault()
const searchBarOpen = container?.classList.contains("active")
searchBarOpen ? hideSearch() : showSearch("basic")
return
} else if (e.shiftKey && (e.ctrlKey || e.metaKey) && e.key.toLowerCase() === "k") {
// Hotkey to open tag search
e.preventDefault()
const searchBarOpen = container?.classList.contains("active")
searchBarOpen ? hideSearch() : showSearch("tags")
// add "#" prefix for tag search
if (searchBar) searchBar.value = "#"
return
}
if (currentHover) {
currentHover.classList.remove("focus")
}
// If search is active, then we will render the first result and display accordingly
if (!container?.classList.contains("active")) return
if (e.key === "Enter") {
// If result has focus, navigate to that one, otherwise pick first result
if (results?.contains(document.activeElement)) {
const active = document.activeElement as HTMLInputElement
if (active.classList.contains("no-match")) return
await displayPreview(active)
active.click()
} else {
const anchor = document.getElementsByClassName("result-card")[0] as HTMLInputElement | null
if (!anchor || anchor?.classList.contains("no-match")) return
await displayPreview(anchor)
anchor.click()
}
} else if (e.key === "ArrowUp" || (e.shiftKey && e.key === "Tab")) {
e.preventDefault()
if (results?.contains(document.activeElement)) {
// If an element in results-container already has focus, focus previous one
const currentResult = currentHover
? currentHover
: (document.activeElement as HTMLInputElement | null)
const prevResult = currentResult?.previousElementSibling as HTMLInputElement | null
currentResult?.classList.remove("focus")
prevResult?.focus()
if (prevResult) currentHover = prevResult
await displayPreview(prevResult)
}
} else if (e.key === "ArrowDown" || e.key === "Tab") {
e.preventDefault()
// The results should already been focused, so we need to find the next one.
// The activeElement is the search bar, so we need to find the first result and focus it.
if (document.activeElement === searchBar || currentHover !== null) {
const firstResult = currentHover
? currentHover
: (document.getElementsByClassName("result-card")[0] as HTMLInputElement | null)
const secondResult = firstResult?.nextElementSibling as HTMLInputElement | null
firstResult?.classList.remove("focus")
secondResult?.focus()
if (secondResult) currentHover = secondResult
await displayPreview(secondResult)
}
}
}
const formatForDisplay = (term: string, id: number) => {
const slug = idDataMap[id]
return {
id,
slug,
title: searchType === "tags" ? data[slug].title : highlight(term, data[slug].title ?? ""),
content: highlight(term, data[slug].content ?? "", true),
tags: highlightTags(term.substring(1), data[slug].tags),
}
}
function highlightTags(term: string, tags: string[]) {
if (!tags || searchType !== "tags") {
return []
}
return tags
.map((tag) => {
if (tag.toLowerCase().includes(term.toLowerCase())) {
return `<li><p class="match-tag">#${tag}</p></li>`
} else {
return `<li><p>#${tag}</p></li>`
}
})
.slice(0, numTagResults)
}
function resolveUrl(slug: FullSlug): URL {
return new URL(resolveRelative(currentSlug, slug), location.toString())
}
const resultToHTML = ({ slug, title, content, tags }: Item) => {
const htmlTags = tags.length > 0 ? `<ul class="tags">${tags.join("")}</ul>` : ``
const itemTile = document.createElement("a")
itemTile.classList.add("result-card")
itemTile.id = slug
itemTile.href = resolveUrl(slug).toString()
itemTile.innerHTML = `<h3>${title}</h3>${htmlTags}${
enablePreview && window.innerWidth > 600 ? "" : `<p>${content}</p>`
}`
itemTile.addEventListener("click", (event) => {
if (event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) return
hideSearch()
})
const handler = (event: MouseEvent) => {
if (event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) return
hideSearch()
}
async function onMouseEnter(ev: MouseEvent) {
if (!ev.target) return
const target = ev.target as HTMLInputElement
await displayPreview(target)
}
itemTile.addEventListener("mouseenter", onMouseEnter)
window.addCleanup(() => itemTile.removeEventListener("mouseenter", onMouseEnter))
itemTile.addEventListener("click", handler)
window.addCleanup(() => itemTile.removeEventListener("click", handler))
return itemTile
}
async function displayResults(finalResults: Item[]) {
if (!results) return
removeAllChildren(results)
if (finalResults.length === 0) {
results.innerHTML = `<a class="result-card no-match">
<h3>No results.</h3>
<p>Try another search term?</p>
</a>`
} else {
results.append(...finalResults.map(resultToHTML))
}
if (finalResults.length === 0 && preview) {
// no results, clear previous preview
removeAllChildren(preview)
} else {
// focus on first result, then also dispatch preview immediately
const firstChild = results.firstElementChild as HTMLElement
firstChild.classList.add("focus")
currentHover = firstChild as HTMLInputElement
await displayPreview(firstChild)
}
}
async function fetchContent(slug: FullSlug): Promise<Element[]> {
if (fetchContentCache.has(slug)) {
return fetchContentCache.get(slug) as Element[]
}
const targetUrl = resolveUrl(slug).toString()
const contents = await fetch(targetUrl)
.then((res) => res.text())
.then((contents) => {
if (contents === undefined) {
throw new Error(`Could not fetch ${targetUrl}`)
}
const html = p.parseFromString(contents ?? "", "text/html")
normalizeRelativeURLs(html, targetUrl)
return [...html.getElementsByClassName("popover-hint")]
})
fetchContentCache.set(slug, contents)
return contents
}
async function displayPreview(el: HTMLElement | null) {
if (!searchLayout || !enablePreview || !el || !preview) return
const slug = el.id as FullSlug
const innerDiv = await fetchContent(slug).then((contents) =>
contents.flatMap((el) => [...highlightHTML(currentSearchTerm, el as HTMLElement).children]),
)
previewInner = document.createElement("div")
previewInner.classList.add("preview-inner")
previewInner.append(...innerDiv)
preview.replaceChildren(previewInner)
// scroll to longest
const highlights = [...preview.querySelectorAll(".highlight")].sort(
(a, b) => b.innerHTML.length - a.innerHTML.length,
)
highlights[0]?.scrollIntoView({ block: "start" })
}
async function onType(e: HTMLElementEventMap["input"]) {
if (!searchLayout || !index) return
currentSearchTerm = (e.target as HTMLInputElement).value
searchLayout.classList.toggle("display-results", currentSearchTerm !== "")
searchType = currentSearchTerm.startsWith("#") ? "tags" : "basic"
let searchResults: FlexSearch.SimpleDocumentSearchResultSetUnit[]
if (searchType === "tags") {
currentSearchTerm = currentSearchTerm.substring(1).trim()
const separatorIndex = currentSearchTerm.indexOf(" ")
if (separatorIndex != -1) {
// search by title and content index and then filter by tag (implemented in flexsearch)
const tag = currentSearchTerm.substring(0, separatorIndex)
const query = currentSearchTerm.substring(separatorIndex + 1).trim()
searchResults = await index.searchAsync({
query: query,
// return at least 10000 documents, so it is enough to filter them by tag (implemented in flexsearch)
limit: Math.max(numSearchResults, 10000),
index: ["title", "content"],
tag: tag,
})
for (let searchResult of searchResults) {
searchResult.result = searchResult.result.slice(0, numSearchResults)
}
// set search type to basic and remove tag from term for proper highlightning and scroll
searchType = "basic"
currentSearchTerm = query
} else {
// default search by tags index
searchResults = await index.searchAsync({
query: currentSearchTerm,
limit: numSearchResults,
index: ["tags"],
})
}
} else if (searchType === "basic") {
searchResults = await index.searchAsync({
query: currentSearchTerm,
limit: numSearchResults,
index: ["title", "content"],
})
}
const getByField = (field: string): number[] => {
const results = searchResults.filter((x) => x.field === field)
return results.length === 0 ? [] : ([...results[0].result] as number[])
}
// order titles ahead of content
const allIds: Set<number> = new Set([
...getByField("title"),
...getByField("content"),
...getByField("tags"),
])
const finalResults = [...allIds].map((id) => formatForDisplay(currentSearchTerm, id))
await displayResults(finalResults)
}
document.addEventListener("keydown", shortcutHandler)
window.addCleanup(() => document.removeEventListener("keydown", shortcutHandler))
searchIcon?.addEventListener("click", () => showSearch("basic"))
window.addCleanup(() => searchIcon?.removeEventListener("click", () => showSearch("basic")))
searchBar?.addEventListener("input", onType)
window.addCleanup(() => searchBar?.removeEventListener("input", onType))
registerEscapeHandler(container, hideSearch)
await fillDocument(data)
})
/**
* Fills flexsearch document with data
* @param index index to fill
* @param data data to fill index with
*/
async function fillDocument(data: { [key: FullSlug]: ContentDetails }) {
let id = 0
const promises: Array<Promise<unknown>> = []
for (const [slug, fileData] of Object.entries<ContentDetails>(data)) {
promises.push(
index.addAsync(id++, {
id,
slug: slug as FullSlug,
title: fileData.title,
content: fileData.content,
tags: fileData.tags,
}),
)
}
return await Promise.all(promises)
}