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