lix-website/themes/lix/assets/bootstrap/node_modules/micromark/lib/preprocess.mjs
2024-04-26 22:49:34 -06:00

95 lines
2.2 KiB
JavaScript

export default preprocess
import codes from './character/codes.mjs'
import constants from './constant/constants.mjs'
var search = /[\0\t\n\r]/g
function preprocess() {
var start = true
var column = 1
var buffer = ''
var atCarriageReturn
return preprocessor
function preprocessor(value, encoding, end) {
var chunks = []
var match
var next
var startPosition
var endPosition
var code
value = buffer + value.toString(encoding)
startPosition = 0
buffer = ''
if (start) {
if (value.charCodeAt(0) === codes.byteOrderMarker) {
startPosition++
}
start = undefined
}
while (startPosition < value.length) {
search.lastIndex = startPosition
match = search.exec(value)
endPosition = match ? match.index : value.length
code = value.charCodeAt(endPosition)
if (!match) {
buffer = value.slice(startPosition)
break
}
if (
code === codes.lf &&
startPosition === endPosition &&
atCarriageReturn
) {
chunks.push(codes.carriageReturnLineFeed)
atCarriageReturn = undefined
} else {
if (atCarriageReturn) {
chunks.push(codes.carriageReturn)
atCarriageReturn = undefined
}
if (startPosition < endPosition) {
chunks.push(value.slice(startPosition, endPosition))
column += endPosition - startPosition
}
if (code === codes.nul) {
chunks.push(codes.replacementCharacter)
column++
} else if (code === codes.ht) {
next = Math.ceil(column / constants.tabSize) * constants.tabSize
chunks.push(codes.horizontalTab)
while (column++ < next) chunks.push(codes.virtualSpace)
} else if (code === codes.lf) {
chunks.push(codes.lineFeed)
column = 1
}
// Must be carriage return.
else {
atCarriageReturn = true
column = 1
}
}
startPosition = endPosition + 1
}
if (end) {
if (atCarriageReturn) chunks.push(codes.carriageReturn)
if (buffer) chunks.push(buffer)
chunks.push(codes.eof)
}
return chunks
}
}