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* @param {string} data - QR code data
* @returns {string} unprocessed data
*/
const none = (data) => data
/**
* @param {string} data - QR code data
* @returns {string} trimmed QR code data
*/
const trim = (data) => data.trim()
/**
* @param {string} data - QR code data
* @returns {string} QR code data with trimmed lines
*/
const trimLines = (data) => data.split('\n').map(line => line.trim()).join('\n')
/**
* @param {string} lineStr - line content
* @returns {{ level: number, isBlankLine: boolean }} indentation information
*/
function getLineIndentation (lineStr) {
const { length } = lineStr
for (let level = 0; level < length; level++) {
if (lineStr.charAt(level).trim() !== '') {
return { level, isBlankLine: false }
}
}
return { level: length, isBlankLine: true }
}
/**
* @param {string} data - QR code data
* @returns {string} QR code data with all lines unindented
*/
const dedent = (data) => {
const lines = data.split('\n')
const indentationsByLine = lines.map(getLineIndentation)
const indentationsLevelsToCheck = indentationsByLine
.filter(({ isBlankLine }) => !isBlankLine)
.map(({ level }) => level)
if (indentationsLevelsToCheck.length <= 0 || Math.min(...indentationsLevelsToCheck) === 0) {
return data
}
const minIndentation = Math.min(...indentationsLevelsToCheck)
const unindentedLines = lines.map((line, lineNumber) => line.slice(Math.max(0, Math.min(indentationsByLine[lineNumber].level, minIndentation))))
return unindentedLines.join('\n')
}
/**
* @param {string} data - QR code data
* @returns {string} QR code data with all lines unindented
*/
const dedentFromFirstLine = (data) => {
const lines = data.split('\n')
const indentationsByLine = lines.map(getLineIndentation)
const firstNonBlankLineIndentation = indentationsByLine.find(({ isBlankLine }) => !isBlankLine)
if (!firstNonBlankLineIndentation) {
return data
}
const charAmountToDedent = firstNonBlankLineIndentation.level
const unindentedLines = lines.map((line, lineNumber) => line.slice(Math.max(0, Math.min(indentationsByLine[lineNumber].level, charAmountToDedent))))
return unindentedLines.join('\n')
}
/**
* @param {string} data - QR code data
* @returns {string} QR code data with trimmed lines
*/
const removeEmptyLines = (data) => data.split('\n').filter(line => line !== '').join('\n')
/**
* @param {string} data - QR code data
* @returns {string} QR code data without blank lines
*/
const removeBlankLines = (data) => data.split('\n').filter(line => line.trim() !== '').join('\n')
/**
* @param {string} data - QR code data
* @returns {string} vcard handled data
*/
const vcard = (data) => {
const unwrappedTextData = removeBlankLines(dedentFromFirstLine(data))
/*
> Content lines SHOULD be folded to a maximum width of 75 octets, excluding the line
> break. Multi-octet characters MUST remain contiguous
https://www.rfc-editor.org/rfc/rfc6350#section-3.2
*/
let lineWidth = 0
let wrappedTextData = ''
for (const char of unwrappedTextData) {
if (char === '\n') {
wrappedTextData += char
lineWidth = 0
continue
}
if (lineWidth >= 75) {
wrappedTextData += '\n '
lineWidth = 1
}
wrappedTextData += char
lineWidth++
}
return useCrflLineBreak(wrappedTextData)
}
/**
* @param {string} data - QR code data
* @returns {string} vevent handled data
*/
const vevent = (data) => {
/*
VEVENT is similar to VCARD
https://www.rfc-editor.org/rfc/rfc5545
*/
return vcard(data)
}
/**
* @param {string} data - QR code data
* @returns {string} data with newlines converted to CRFL (\r\n)
*/
const useCrflLineBreak = (data) => data.replaceAll('\r\n', '\n').replaceAll('\n', '\r\n')
/**
* @type {{[name:string]: (data: string) => string}}
*/
const preProcessMap = {
none,
pre: none,
trim,
dedent,
'dedent-from-first-line': dedentFromFirstLine,
'trim-line': trimLines,
'trim-lines': trimLines,
'no-empty-line': removeEmptyLines,
'no-empty-lines': removeEmptyLines,
'no-blank-line': removeBlankLines,
'no-blank-lines': removeBlankLines,
vcard,
vevent,
}
/**
* @param {string} data - QR code element text content
* @returns {string[]} processed data
*/
function getPreprocessesFromContent (data) {
const trimmedData = trim(data)
if (/^BEGIN:[vV][cC][aA][rR][dD]/.test(trimmedData)) {
return ['vcard']
}
if (/^BEGIN:[vV][eE][vV][eE][nN][tT]/.test(trimmedData)) {
return ['vevent']
}
return ['trim']
}
/**
* @param {string} preprocessAttr - QR code data-pre-process attribute
* @param {string} data - QR code element text content to use `getPreprocessesFromContent` if invalid
* @returns {string[]} processed data
*/
function getPreprocessesFromAttribute (preprocessAttr, data) {
const splitData = preprocessAttr.split(' ')
.map(name => name.toLowerCase())
.filter(name => Object.hasOwn(preProcessMap, name))
if (splitData.length === 0) {
return getPreprocessesFromContent(data)
}
return splitData
}
/**
* Process QR code element text element before transforming to QRCode
* @param {string} data - QR code element text content
* @param {string} [preprocessAttr] - QR code data-pre-process attribute
* @returns {string} processed data
*/
export function preProcess (data, preprocessAttr) {
const preprocesses = preprocessAttr ? getPreprocessesFromAttribute(preprocessAttr, data) : getPreprocessesFromContent(data)
return preprocesses.reduce((acc, name) => preProcessMap[name](acc), data)
}
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