70 lines
1.5 KiB
Plaintext
70 lines
1.5 KiB
Plaintext
const tab = 9 /* `\t` */
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const space = 32 /* ` ` */
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/**
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* Remove initial and final spaces and tabs at the line breaks in `value`.
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* Does not trim initial and final spaces and tabs of the value itself.
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*
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* @param {string} value
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* Value to trim.
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* @returns {string}
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* Trimmed value.
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*/
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export function trimLines(value) {
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const source = String(value)
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const search = /\r?\n|\r/g
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let match = search.exec(source)
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let last = 0
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/** @type {Array<string>} */
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const lines = []
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while (match) {
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lines.push(
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trimLine(source.slice(last, match.index), last > 0, true),
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match[0]
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)
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last = match.index + match[0].length
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match = search.exec(source)
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}
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lines.push(trimLine(source.slice(last), last > 0, false))
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return lines.join('')
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}
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/**
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* @param {string} value
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* Line to trim.
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* @param {boolean} start
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* Whether to trim the start of the line.
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* @param {boolean} end
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* Whether to trim the end of the line.
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* @returns {string}
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* Trimmed line.
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*/
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function trimLine(value, start, end) {
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let startIndex = 0
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let endIndex = value.length
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if (start) {
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let code = value.codePointAt(startIndex)
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while (code === tab || code === space) {
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startIndex++
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code = value.codePointAt(startIndex)
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}
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}
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if (end) {
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let code = value.codePointAt(endIndex - 1)
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while (code === tab || code === space) {
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endIndex--
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code = value.codePointAt(endIndex - 1)
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}
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}
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return endIndex > startIndex ? value.slice(startIndex, endIndex) : ''
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}
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