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87 lines
2.0 KiB
87 lines
2.0 KiB
4 years ago
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module.exports = function normalize(path) {
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var parts = path.split(/(\\+|\/+)/);
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if(parts.length === 1)
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return path;
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var result = [];
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var absolutePathStart = 0;
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for(var i = 0, sep = false; i < parts.length; i++, sep = !sep) {
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var part = parts[i];
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if(i === 0 && /^([A-Z]:)?$/i.test(part)) {
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result.push(part);
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absolutePathStart = 2;
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} else if(sep) {
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result.push(part[0]);
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} else if(part === "..") {
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switch(result.length) {
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case 0:
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// i. e. ".." => ".."
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// i. e. "../a/b/c" => "../a/b/c"
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result.push(part);
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break;
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case 2:
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// i. e. "a/.." => ""
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// i. e. "/.." => "/"
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// i. e. "C:\.." => "C:\"
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// i. e. "a/../b/c" => "b/c"
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// i. e. "/../b/c" => "/b/c"
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// i. e. "C:\..\a\b\c" => "C:\a\b\c"
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i++;
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sep = !sep;
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result.length = absolutePathStart;
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break;
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case 4:
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// i. e. "a/b/.." => "a"
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// i. e. "/a/.." => "/"
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// i. e. "C:\a\.." => "C:\"
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// i. e. "/a/../b/c" => "/b/c"
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if(absolutePathStart === 0) {
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result.length -= 3;
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} else {
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i++;
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sep = !sep;
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result.length = 2;
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}
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break;
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default:
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// i. e. "/a/b/.." => "/a"
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// i. e. "/a/b/../c" => "/a/c"
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result.length -= 3;
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break;
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}
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} else if(part === ".") {
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switch(result.length) {
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case 0:
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// i. e. "." => "."
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// i. e. "./a/b/c" => "./a/b/c"
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result.push(part);
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break;
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case 2:
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// i. e. "a/." => "a"
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// i. e. "/." => "/"
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// i. e. "C:\." => "C:\"
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// i. e. "C:\.\a\b\c" => "C:\a\b\c"
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if(absolutePathStart === 0) {
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result.length--;
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} else {
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i++;
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sep = !sep;
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}
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break;
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default:
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// i. e. "a/b/." => "a/b"
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// i. e. "/a/." => "/"
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// i. e. "C:\a\." => "C:\"
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// i. e. "a/./b/c" => "a/b/c"
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// i. e. "/a/./b/c" => "/a/b/c"
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result.length--;
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break;
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}
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} else if(part) {
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result.push(part);
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}
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}
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if(result.length === 1 && /^[A-Za-z]:$/.test(result))
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return result[0] + "\\";
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return result.join("");
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};
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