quartz-research-note/assets/js/search.js

271 lines
7.5 KiB
JavaScript

// code from https://github.com/danestves/markdown-to-text
const removeMarkdown = (
markdown,
options = {
listUnicodeChar: false,
stripListLeaders: true,
gfm: true,
useImgAltText: false,
preserveLinks: false,
}
) => {
let output = markdown || ''
output = output.replace(/^(-\s*?|\*\s*?|_\s*?){3,}\s*$/gm, '')
try {
if (options.stripListLeaders) {
if (options.listUnicodeChar)
output = output.replace(
/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm,
options.listUnicodeChar + ' $1'
)
else output = output.replace(/^([\s\t]*)([\*\-\+]|\d+\.)\s+/gm, '$1')
}
if (options.gfm) {
output = output
.replace(/\n={2,}/g, '\n')
.replace(/~{3}.*\n/g, '')
.replace(/~~/g, '')
.replace(/`{3}.*\n/g, '')
}
if (options.preserveLinks) {
output = output.replace(/\[(.*?)\][\[\(](.*?)[\]\)]/g, '$1 ($2)')
}
output = output
.replace(/<[^>]*>/g, '')
.replace(/^[=\-]{2,}\s*$/g, '')
.replace(/\[\^.+?\](\: .*?$)?/g, '')
.replace(/(#{1,6})\s+(.+)\1?/g, '<b>$2</b>')
.replace(/\s{0,2}\[.*?\]: .*?$/g, '')
.replace(/\!\[(.*?)\][\[\(].*?[\]\)]/g, options.useImgAltText ? '$1' : '')
.replace(/\[(.*?)\][\[\(].*?[\]\)]/g, '<a>$1</a>')
.replace(/!?\[\[\S[^\[\]\|]*(?:\|([^\[\]]*))?\S\]\]/g, '<a>$1</a>')
.replace(/^\s{0,3}>\s?/g, '')
.replace(/(^|\n)\s{0,3}>\s?/g, '\n\n')
.replace(/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/g, '')
.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, '$2')
.replace(/([\*_]{1,3})(\S.*?\S{0,1})\1/g, '$2')
.replace(/(`{3,})(.*?)\1/gm, '$2')
.replace(/`(.+?)`/g, '$1')
.replace(/\n{2,}/g, '\n\n')
} catch (e) {
console.error(e)
return markdown
}
return output
}
// -----
const highlight = (content, term) => {
const highlightWindow = 20
// try to find direct match first
const directMatchIdx = content.indexOf(term)
if (directMatchIdx !== -1) {
const h = highlightWindow / 2
const before = content.substring(0, directMatchIdx).split(" ").slice(-h)
const after = content.substring(directMatchIdx + term.length, content.length - 1).split(" ").slice(0, h)
return (before.length == h ? `...${before.join(" ")}` : before.join(" ")) + `<span class="search-highlight">${term}</span>` + after.join(" ")
}
const tokenizedTerm = term.split(/\s+/).filter((t) => t !== '')
const splitText = content.split(/\s+/).filter((t) => t !== '')
const includesCheck = (token) =>
tokenizedTerm.some((term) =>
token.toLowerCase().startsWith(term.toLowerCase())
)
const occurrencesIndices = splitText.map(includesCheck)
// calculate best index
let bestSum = 0
let bestIndex = 0
for (
let i = 0;
i < Math.max(occurrencesIndices.length - highlightWindow, 0);
i++
) {
const window = occurrencesIndices.slice(i, i + highlightWindow)
const windowSum = window.reduce((total, cur) => total + cur, 0)
if (windowSum >= bestSum) {
bestSum = windowSum
bestIndex = i
}
}
const startIndex = Math.max(bestIndex - highlightWindow, 0)
const endIndex = Math.min(
startIndex + 2 * highlightWindow,
splitText.length
)
const mappedText = splitText
.slice(startIndex, endIndex)
.map((token) => {
if (includesCheck(token)) {
return `<span class="search-highlight">${token}</span>`
}
return token
})
.join(' ')
.replaceAll('</span> <span class="search-highlight">', ' ')
return `${startIndex === 0 ? '' : '...'}${mappedText}${endIndex === splitText.length ? '' : '...'
}`
};
(async function() {
const encoder = (str) => str.toLowerCase().split(/([^a-z]|[^\x00-\x7F])+/)
const contentIndex = new FlexSearch.Document({
cache: true,
charset: 'latin:extra',
optimize: true,
index: [
{
field: 'content',
tokenize: 'reverse',
encode: encoder,
},
{
field: 'title',
tokenize: 'forward',
encode: encoder,
},
],
})
const { content } = await fetchData
for (const [key, value] of Object.entries(content)) {
contentIndex.add({
id: key,
title: value.title,
content: removeMarkdown(value.content),
})
}
const resultToHTML = ({ url, title, content, term }) => {
const text = removeMarkdown(content)
const resultTitle = highlight(title, term)
const resultText = highlight(text, term)
return `<button class="result-card" id="${url}">
<h3>${resultTitle}</h3>
<p>${resultText}</p>
</button>`
}
const redir = (id, term) => {
// SPA navigation
window.navigate(
new URL(
`${BASE_URL.replace(/\/$/g, "")}${id}#:~:text=${encodeURIComponent(term)}/`
),
'.singlePage'
)
closeSearch()
}
const formatForDisplay = (id) => ({
id,
url: id,
title: content[id].title,
content: content[id].content,
})
const source = document.getElementById('search-bar')
const results = document.getElementById('results-container')
let term
source.addEventListener('keyup', (e) => {
if (e.key === 'Enter') {
const anchor = document.getElementsByClassName('result-card')[0]
redir(anchor.id, term)
}
})
source.addEventListener('input', (e) => {
term = e.target.value
const searchResults = contentIndex.search(term, [
{
field: 'content',
limit: 10,
},
{
field: 'title',
limit: 5,
},
])
const getByField = (field) => {
const results = searchResults.filter((x) => x.field === field)
if (results.length === 0) {
return []
} else {
return [...results[0].result]
}
}
const allIds = new Set([...getByField('title'), ...getByField('content')])
const finalResults = [...allIds].map(formatForDisplay)
// display
if (finalResults.length === 0) {
results.innerHTML = `<button class="result-card">
<h3>No results.</h3>
<p>Try another search term?</p>
</button>`
} else {
results.innerHTML = finalResults
.map((result) =>
resultToHTML({
...result,
term,
})
)
.join('\n')
const anchors = [...document.getElementsByClassName('result-card')]
anchors.forEach((anchor) => {
anchor.onclick = () => redir(anchor.id, term)
})
}
})
const searchContainer = document.getElementById('search-container')
function openSearch() {
if (
searchContainer.style.display === 'none' ||
searchContainer.style.display === ''
) {
source.value = ''
results.innerHTML = ''
searchContainer.style.display = 'block'
source.focus()
} else {
searchContainer.style.display = 'none'
}
}
function closeSearch() {
searchContainer.style.display = 'none'
}
document.addEventListener('keydown', (event) => {
if (event.key === 'k' && (event.ctrlKey || event.metaKey)) {
event.preventDefault()
openSearch()
}
if (event.key === 'Escape') {
event.preventDefault()
closeSearch()
}
})
const searchButton = document.getElementById('search-icon')
searchButton.addEventListener('click', (evt) => {
openSearch()
})
searchButton.addEventListener('keydown', (evt) => {
openSearch()
})
searchContainer.addEventListener('click', (evt) => {
closeSearch()
})
document.getElementById('search-space').addEventListener('click', (evt) => {
evt.stopPropagation()
})
})()