68 lines
1.8 KiB
Plaintext
68 lines
1.8 KiB
Plaintext
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const {
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CHAR_DOT,
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CHAR_FORWARD_SLASH
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} = require('./constants')
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exports.normalizeString = function normalizeString (path, allowAboveRoot, separator, isPathSeparator) {
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let res = ''
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let lastSegmentLength = 0
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let lastSlash = -1
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let dots = 0
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let code = 0
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for (let i = 0; i <= path.length; ++i) {
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if (i < path.length) {
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code = path.charCodeAt(i)
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} else if (isPathSeparator(code)) {
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break
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} else {
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code = CHAR_FORWARD_SLASH
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}
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if (isPathSeparator(code)) {
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if (lastSlash === i - 1 || dots === 1) ;
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else if (dots === 2) {
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if (res.length < 2 || lastSegmentLength !== 2 || res.charCodeAt(res.length - 1) !== CHAR_DOT || res.charCodeAt(res.length - 2) !== CHAR_DOT) {
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if (res.length > 2) {
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const lastSlashIndex = res.lastIndexOf(separator)
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if (lastSlashIndex === -1) {
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res = ''
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lastSegmentLength = 0
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} else {
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res = res.substring(0, lastSlashIndex)
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lastSegmentLength =
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res.length - 1 - res.lastIndexOf(separator)
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}
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lastSlash = i
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dots = 0
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continue
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} else if (res.length !== 0) {
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res = ''
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lastSegmentLength = 0
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lastSlash = i
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dots = 0
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continue
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}
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}
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if (allowAboveRoot) {
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res += res.length > 0 ? `${separator}..` : '..'
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lastSegmentLength = 2
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}
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} else {
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if (res.length > 0) {
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res += `${separator}${path.substring(lastSlash + 1, i)}`
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} else {
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res = path.substring(lastSlash + 1, i)
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}
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lastSegmentLength = i - lastSlash - 1
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}
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lastSlash = i
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dots = 0
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} else if (code === CHAR_DOT && dots !== -1) {
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++dots
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} else {
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dots = -1
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}
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}
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return res
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}
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