100 lines
2.3 KiB
JavaScript
100 lines
2.3 KiB
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
// eslint-disable-next-line complexity
|
||
|
|
module.exports = function normalize(path) {
|
||
|
|
var parts = path.split(/(\\+|\/+)/);
|
||
|
|
if(parts.length === 1)
|
||
|
|
return path;
|
||
|
|
var result = [];
|
||
|
|
var absolutePathStart = 0;
|
||
|
|
for(var i = 0, sep = false; i < parts.length; i += 1, sep = !sep) {
|
||
|
|
var part = parts[i];
|
||
|
|
if(i === 0 && /^([A-Z]:)?$/i.test(part)) {
|
||
|
|
result.push(part);
|
||
|
|
absolutePathStart = 2;
|
||
|
|
} else if(sep) {
|
||
|
|
// UNC paths on Windows begin with a double backslash.
|
||
|
|
if (i === 1 && parts[0].length === 0 && part === "\\\\") {
|
||
|
|
result.push(part);
|
||
|
|
} else {
|
||
|
|
result.push(part[0]);
|
||
|
|
}
|
||
|
|
} else if(part === "..") {
|
||
|
|
switch(result.length) {
|
||
|
|
case 0:
|
||
|
|
// i. e. ".." => ".."
|
||
|
|
// i. e. "../a/b/c" => "../a/b/c"
|
||
|
|
result.push(part);
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
// i. e. "a/.." => ""
|
||
|
|
// i. e. "/.." => "/"
|
||
|
|
// i. e. "C:\.." => "C:\"
|
||
|
|
// i. e. "a/../b/c" => "b/c"
|
||
|
|
// i. e. "/../b/c" => "/b/c"
|
||
|
|
// i. e. "C:\..\a\b\c" => "C:\a\b\c"
|
||
|
|
if (result[0] !== ".") {
|
||
|
|
i += 1;
|
||
|
|
sep = !sep;
|
||
|
|
result.length = absolutePathStart;
|
||
|
|
} else {
|
||
|
|
result.length = 0;
|
||
|
|
result.push(part);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
// i. e. "a/b/.." => "a"
|
||
|
|
// i. e. "/a/.." => "/"
|
||
|
|
// i. e. "C:\a\.." => "C:\"
|
||
|
|
// i. e. "/a/../b/c" => "/b/c"
|
||
|
|
if(absolutePathStart === 0) {
|
||
|
|
result.length -= 3;
|
||
|
|
} else {
|
||
|
|
i += 1;
|
||
|
|
sep = !sep;
|
||
|
|
result.length = 2;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
// i. e. "/a/b/.." => "/a"
|
||
|
|
// i. e. "/a/b/../c" => "/a/c"
|
||
|
|
result.length -= 3;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else if(part === ".") {
|
||
|
|
switch(result.length) {
|
||
|
|
case 0:
|
||
|
|
// i. e. "." => "."
|
||
|
|
// i. e. "./a/b/c" => "./a/b/c"
|
||
|
|
result.push(part);
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
// i. e. "a/." => "a"
|
||
|
|
// i. e. "/." => "/"
|
||
|
|
// i. e. "C:\." => "C:\"
|
||
|
|
// i. e. "C:\.\a\b\c" => "C:\a\b\c"
|
||
|
|
if(absolutePathStart === 0) {
|
||
|
|
result.length -= 1;
|
||
|
|
} else {
|
||
|
|
i += 1;
|
||
|
|
sep = !sep;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
// i. e. "a/b/." => "a/b"
|
||
|
|
// i. e. "/a/." => "/"
|
||
|
|
// i. e. "C:\a\." => "C:\"
|
||
|
|
// i. e. "a/./b/c" => "a/b/c"
|
||
|
|
// i. e. "/a/./b/c" => "/a/b/c"
|
||
|
|
result.length -= 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else if(part) {
|
||
|
|
result.push(part);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if(result.length === 1 && /^[A-Za-z]:$/.test(result[0]))
|
||
|
|
return result[0] + "\\";
|
||
|
|
return result.join("");
|
||
|
|
};
|