141 lines
3.8 KiB
JavaScript
141 lines
3.8 KiB
JavaScript
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let ProcessText = module.exports = {}
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ProcessText.removeHtml = (string) => {
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if(string == undefined || string == null || string.length == 0){
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return ''
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}
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return string
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.replace(/&[#A-Za-z0-9]+;/g,' ') //Rip out all HTML entities
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.replace(/<[^>]+>/g, ' ') //Rip out all HTML tags
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.replace(/\s+/g, ' ') //Remove all whitespace
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.trim()
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}
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ProcessText.getUrlsFromString = (string) => {
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const urlPattern = /(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)(?:\([-A-Z0-9+&@#/%=~_|$?!:,.]*\)|[-A-Z0-9+&@#/%=~_|$?!:,.])*(?:\([-A-Z0-9+&@#/%=~_|$?!:,.]*\)|[A-Z0-9+&@#/%=~_|$])/igm
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return string.match(urlPattern)
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}
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/*
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Pulls out title and subtext of note
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+ Title is always first line
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+ Empty lines are skipped
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+ URLs are turned into links
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+ All URLs are givent the target="_blank" property
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*/
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ProcessText.deduceNoteTitle = (inString) => {
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let title = '' //Title of note
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let sub = '' //sub text below note
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if(!inString || inString == null || inString.length == 0){
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return {title, sub}
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}
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let lines = inString.match(/[^\r\n]+/g)
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let finalLines = []
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const startTags = ['<ol','<li','<ul']
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const endTags = ['</o','</l','</u']
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let totalLines = Math.min(lines.length, 6)
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let charLimit = 250
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let listStart = false
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for(let i=0; i < totalLines; i++){
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//Just in case 'i' gets bigger than array
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if(lines[i] === undefined){
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continue
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}
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const cleanLine = ProcessText.removeHtml(lines[i]).trim().replace(' ','')
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const lineStart = lines[i].trim().substring(0, 3)
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charLimit -= cleanLine.length
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//Close out list if char limit is hit
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if(charLimit <= 0 && listStart){
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finalLines.push(lines[i])
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break
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}
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//Images appear as empty, push em!
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if(cleanLine.length == 0 && lines[i].indexOf('<img') != -1){
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finalLines.push(lines[i])
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continue
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}
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//Empty line, may be a list open or close
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if(cleanLine.length == 0 && (startTags.includes(lineStart) || endTags.includes(lineStart) )){
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if(listStart == false){
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charLimit = 400 //Double size for list notes
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}
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finalLines.push(lines[i])
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totalLines++
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listStart = true
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continue
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}
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//If line is part of a list, up counter, we want the whole list
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if(startTags.includes(lineStart)){
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totalLines++
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}
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//Skip empty lines
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if(!cleanLine || cleanLine.length == 0 || cleanLine == ' '){
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totalLines++
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continue
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}
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//turn urls into links, don't process if its already an <a href=
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const containsUrls = ProcessText.getUrlsFromString(cleanLine)
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if(containsUrls && containsUrls.length == 1 && lines[i].indexOf('</a>') == -1){
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const url = containsUrls[0]
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lines[i] = lines[i].replace(url, `<a href="${url}">${url}</a>`)
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}
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//Insert target=_blank into links if set, do it for every link in line
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if(lines[i].indexOf('</a>') > 0){
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lines[i] = lines[i].replace(/<a /g, '<a target="_blank" ')
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}
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//Limit output characters
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//Check character limit
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if(charLimit <= 0 && listStart == false){
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//Cut the string down to character limit
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const cutString = lines[i].substring(0, lines[i].length+charLimit)
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//Find last space and cut off everything after it
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let cleanCutString = cutString.substring(0, cutString.lastIndexOf(' '))
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//Some strings may not contain a space resulting in no string
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if(cleanCutString.length == 0){
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cleanCutString = cutString
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}
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finalLines.push(cleanCutString + '...')
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break;
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}
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finalLines.push(lines[i])
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}
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//Pull out title if its not an empty string
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if(ProcessText.removeHtml(finalLines[0]).trim().replace(' ','').length > 0){
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title = finalLines.shift()
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}
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sub = finalLines.join('')
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//Return final display lengths
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let titleLength = ProcessText.removeHtml(title).trim().replace(' ','').length
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let subtextLength = ProcessText.removeHtml(sub).trim().replace(' ','').length
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return { title, sub, titleLength, subtextLength }
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} |