index.js
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'use strict';
var path = require('path');
var inspect = require('util').inspect;
function assertPath(path) {
if (typeof path !== 'string') {
throw new TypeError('Path must be a string. Received ' + inspect(path));
}
}
function posix(path) {
assertPath(path);
if (path.length === 0)
return '.';
var code = path.charCodeAt(0);
var hasRoot = (code === 47/*/*/);
var end = -1;
var matchedSlash = true;
for (var i = path.length - 1; i >= 1; --i) {
code = path.charCodeAt(i);
if (code === 47/*/*/) {
if (!matchedSlash) {
end = i;
break;
}
} else {
// We saw the first non-path separator
matchedSlash = false;
}
}
if (end === -1)
return hasRoot ? '/' : '.';
if (hasRoot && end === 1)
return '//';
return path.slice(0, end);
}
function win32(path) {
assertPath(path);
var len = path.length;
if (len === 0)
return '.';
var rootEnd = -1;
var end = -1;
var matchedSlash = true;
var offset = 0;
var code = path.charCodeAt(0);
// Try to match a root
if (len > 1) {
if (code === 47/*/*/ || code === 92/*\*/) {
// Possible UNC root
rootEnd = offset = 1;
code = path.charCodeAt(1);
if (code === 47/*/*/ || code === 92/*\*/) {
// Matched double path separator at beginning
var j = 2;
var last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
code = path.charCodeAt(j);
if (code === 47/*/*/ || code === 92/*\*/)
break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
code = path.charCodeAt(j);
if (code !== 47/*/*/ && code !== 92/*\*/)
break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
code = path.charCodeAt(j);
if (code === 47/*/*/ || code === 92/*\*/)
break;
}
if (j === len) {
// We matched a UNC root only
return path;
}
if (j !== last) {
// We matched a UNC root with leftovers
// Offset by 1 to include the separator after the UNC root to
// treat it as a "normal root" on top of a (UNC) root
rootEnd = offset = j + 1;
}
}
}
}
} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||
(code >= 97/*a*/ && code <= 122/*z*/)) {
// Possible device root
code = path.charCodeAt(1);
if (path.charCodeAt(1) === 58/*:*/) {
rootEnd = offset = 2;
if (len > 2) {
code = path.charCodeAt(2);
if (code === 47/*/*/ || code === 92/*\*/)
rootEnd = offset = 3;
}
}
}
} else if (code === 47/*/*/ || code === 92/*\*/) {
return path[0];
}
for (var i = len - 1; i >= offset; --i) {
code = path.charCodeAt(i);
if (code === 47/*/*/ || code === 92/*\*/) {
if (!matchedSlash) {
end = i;
break;
}
} else {
// We saw the first non-path separator
matchedSlash = false;
}
}
if (end === -1) {
if (rootEnd === -1)
return '.';
else
end = rootEnd;
}
return path.slice(0, end);
}
module.exports = process.platform === 'win32' ? win32 : posix;
module.exports.posix = posix;
module.exports.win32 = win32;