refactor: move search utils to util.js
Jacky Zhao
3 years ago
parent
93d039fe7c
commit
14b89105dc
@ -0,0 +1,207 @@
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// code from https://github.com/danestves/markdown-to-text
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const removeMarkdown = (
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markdown,
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options = {
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listUnicodeChar: false,
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stripListLeaders: true,
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gfm: true,
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useImgAltText: false,
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preserveLinks: false,
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},
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) => {
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let output = markdown || ""
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output = output.replace(/^(-\s*?|\*\s*?|_\s*?){3,}\s*$/gm, "")
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try {
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if (options.stripListLeaders) {
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if (options.listUnicodeChar)
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output = output.replace(/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm, options.listUnicodeChar + " $1")
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else output = output.replace(/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm, "$1")
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}
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if (options.gfm) {
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output = output
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.replace(/\n={2,}/g, "\n")
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.replace(/~{3}.*\n/g, "")
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.replace(/~~/g, "")
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.replace(/`{3}.*\n/g, "")
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}
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if (options.preserveLinks) {
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output = output.replace(/\[(.*?)\][\[\(](.*?)[\]\)]/g, "$1 ($2)")
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}
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output = output
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.replace(/<[^>]*>/g, "")
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.replace(/^[=\-]{2,}\s*$/g, "")
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.replace(/\[\^.+?\](\: .*?$)?/g, "")
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.replace(/(#{1,6})\s+(.+)\1?/g, "<b>$2</b>")
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.replace(/\s{0,2}\[.*?\]: .*?$/g, "")
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.replace(/\!\[(.*?)\][\[\(].*?[\]\)]/g, options.useImgAltText ? "$1" : "")
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.replace(/\[(.*?)\][\[\(].*?[\]\)]/g, "<a>$1</a>")
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.replace(/!?\[\[\S[^\[\]\|]*(?:\|([^\[\]]*))?\S\]\]/g, "<a>$1</a>")
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.replace(/^\s{0,3}>\s?/g, "")
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.replace(/(^|\n)\s{0,3}>\s?/g, "\n\n")
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.replace(/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/g, "")
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.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, "$2")
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.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, "$2")
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.replace(/(`{3,})(.*?)\1/gm, "$2")
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.replace(/`(.+?)`/g, "$1")
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.replace(/\n{2,}/g, "\n\n")
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.replace(/\[![a-zA-Z]+\][-\+]? /g, "")
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} catch (e) {
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console.error(e)
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return markdown
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}
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return output
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}
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const highlight = (content, term) => {
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const highlightWindow = 20
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// try to find direct match first
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const directMatchIdx = content.indexOf(term)
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if (directMatchIdx !== -1) {
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const h = highlightWindow / 2
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const before = content.substring(0, directMatchIdx).split(" ").slice(-h)
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const after = content
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.substring(directMatchIdx + term.length, content.length - 1)
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.split(" ")
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.slice(0, h)
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return (
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(before.length == h ? `...${before.join(" ")}` : before.join(" ")) +
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`<span class="search-highlight">${term}</span>` +
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after.join(" ")
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)
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}
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const tokenizedTerm = term.split(/\s+/).filter((t) => t !== "")
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const splitText = content.split(/\s+/).filter((t) => t !== "")
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const includesCheck = (token) =>
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tokenizedTerm.some((term) => token.toLowerCase().startsWith(term.toLowerCase()))
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const occurrencesIndices = splitText.map(includesCheck)
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// calculate best index
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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(occurrencesIndices.length - highlightWindow, 0); i++) {
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const window = occurrencesIndices.slice(i, i + highlightWindow)
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const windowSum = window.reduce((total, cur) => total + cur, 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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const startIndex = Math.max(bestIndex - highlightWindow, 0)
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const endIndex = Math.min(startIndex + 2 * highlightWindow, splitText.length)
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const mappedText = splitText
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.slice(startIndex, endIndex)
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.map((token) => {
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if (includesCheck(token)) {
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return `<span class="search-highlight">${token}</span>`
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}
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return token
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})
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.join(" ")
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.replaceAll('</span> <span class="search-highlight">', " ")
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return `${startIndex === 0 ? "" : "..."}${mappedText}${endIndex === splitText.length ? "" : "..."
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}`
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}
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// Common utilities for search
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const resultToHTML = ({ url, title, content, term }) => {
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const text = removeMarkdown(content)
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const resultTitle = highlight(title, term)
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const resultText = highlight(text, term)
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return `<button class="result-card" id="${url}">
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<h3>${resultTitle}</h3>
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<p>${resultText}</p>
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</button>`
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}
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const redir = (id, term) => {
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// SPA navigation
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window.Million.navigate(
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new URL(`${BASE_URL.replace(/\/$/g, "")}${id}#:~:text=${encodeURIComponent(term)}/`),
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".singlePage",
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)
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closeSearch()
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}
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function openSearch() {
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const source = document.getElementById("search-bar")
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const results = document.getElementById("results-container")
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const searchContainer = document.getElementById("search-container")
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if (searchContainer.style.display === "none" || searchContainer.style.display === "") {
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source.value = ""
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results.innerHTML = ""
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searchContainer.style.display = "block"
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source.focus()
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} else {
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searchContainer.style.display = "none"
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}
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}
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function closeSearch() {
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const searchContainer = document.getElementById("search-container")
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searchContainer.style.display = "none"
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}
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const registerHandlers = (onInputFn) => {
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const source = document.getElementById("search-bar")
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const searchContainer = document.getElementById("search-container")
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let term
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source.addEventListener("keyup", (e) => {
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if (e.key === "Enter") {
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const anchor = document.getElementsByClassName("result-card")[0]
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redir(anchor.id, term)
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}
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})
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source.addEventListener("input", onInputFn)
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document.addEventListener("keydown", (event) => {
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if (event.key === "k" && (event.ctrlKey || event.metaKey)) {
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event.preventDefault()
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openSearch()
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}
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if (event.key === "Escape") {
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event.preventDefault()
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closeSearch()
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}
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})
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const searchButton = document.getElementById("search-icon")
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searchButton.addEventListener("click", (_) => {
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openSearch()
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})
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searchButton.addEventListener("keydown", (_) => {
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openSearch()
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})
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searchContainer.addEventListener("click", (_) => {
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closeSearch()
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})
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document.getElementById("search-space").addEventListener("click", (evt) => {
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evt.stopPropagation()
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})
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}
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const displayResults = (finalResults) => {
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const results = document.getElementById("results-container")
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if (finalResults.length === 0) {
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results.innerHTML = `<button class="result-card">
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<h3>No results.</h3>
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<p>Try another search term?</p>
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</button>`
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} else {
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results.innerHTML = finalResults
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.map((result) =>
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resultToHTML({
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...result,
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term,
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}),
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)
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.join("\n")
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const anchors = [...document.getElementsByClassName("result-card")]
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anchors.forEach((anchor) => {
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anchor.onclick = () => redir(anchor.id, term)
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})
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}
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}
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@ -1,10 +1,12 @@
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<div id="search-container">
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<div id="search-space">
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<input autocomplete="off" id="search-bar" name="search" type="text" aria-label="Search" placeholder="Search for something...">
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<div id="results-container">
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</div>
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<div id="search-space">
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<input autocomplete="off" id="search-bar" name="search" type="text" aria-label="Search"
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placeholder="Search for something...">
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<div id="results-container">
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</div>
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</div>
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</div>
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<script src="https://cdn.jsdelivr.net/npm/flexsearch@0.7.21/dist/flexsearch.bundle.js" integrity="sha256-i3A0NZGkhsKjVMzFxv3ksk0DZh3aXqu0l49Bbh0MdjE=" crossorigin="anonymous" defer></script>
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{{ $js := resources.Get "js/search.js" | resources.Fingerprint "md5" | resources.Minify }}
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<script src="https://cdn.jsdelivr.net/npm/flexsearch@0.7.21/dist/flexsearch.bundle.js"
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integrity="sha256-i3A0NZGkhsKjVMzFxv3ksk0DZh3aXqu0l49Bbh0MdjE=" crossorigin="anonymous" defer></script>
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{{ $js := resources.Get "js/search.js" | resources.Fingerprint "md5" | resources.Minify }}
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<script defer src="{{ $js.Permalink }}"></script>
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