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path: refactor for less indentation
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This moves the `if (len === 1)` case to the top of the function.
That way it is possible to reduce the indentation level due to
returning early in that case.

On top of that the following was done:

1) For clarity refactored for loops which were meant to count up a
   variable into a while loop.
2) Used template strings instead of string concat.
3) Consolidating nested if statements.
4) Using tenary expressions if applicable when assigning variables
   to reduce the code overhead.

PR-URL: #25278
Reviewed-By: Michaël Zasso <[email protected]>
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@BridgeAR @addaleax
BridgeAR authored and addaleax committed Mar 1, 2019
1 parent e00c8cd commit 348f1fb
Showing 1 changed file with 147 additions and 174 deletions.
321 changes: 147 additions & 174 deletions lib/path.js
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Original file line number Diff line number Diff line change
Expand Up @@ -270,77 +270,67 @@ const win32 = {
const code = path.charCodeAt(0);

// Try to match a root
if (len > 1) {
if (isPathSeparator(code)) {
// Possible UNC root

// If we started with a separator, we know we at least have an absolute
// path of some kind (UNC or otherwise)
isAbsolute = true;
if (len === 1) {
// `path` contains just a single char, exit early to avoid
// unnecessary work
return isPosixPathSeparator(code) ? '\\' : path;
}
if (isPathSeparator(code)) {
// Possible UNC root

if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
var j = 2;
var last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
// If we started with a separator, we know we at least have an absolute
// path of some kind (UNC or otherwise)
isAbsolute = true;

if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
const firstPart = path.slice(last, j);
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
const firstPart = path.slice(last, j);
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j)))
break;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
}
if (j === len) {
// We matched a UNC root only
// Return the normalized version of the UNC root since there
// is nothing left to process

return '\\\\' + firstPart + '\\' + path.slice(last) + '\\';
} else if (j !== last) {
// We matched a UNC root with leftovers

device = '\\\\' + firstPart + '\\' + path.slice(last, j);
rootEnd = j;
}
if (j === len) {
// We matched a UNC root only
// Return the normalized version of the UNC root since there
// is nothing left to process
return `\\\\${firstPart}\\${path.slice(last)}\\`;
}
}
} else {
rootEnd = 1;
}
} else if (isWindowsDeviceRoot(code)) {
// Possible device root

if (path.charCodeAt(1) === CHAR_COLON) {
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
if (j !== last) {
// We matched a UNC root with leftovers
device = `\\\\${firstPart}\\${path.slice(last, j)}`;
rootEnd = j;
}
}
}
} else {
rootEnd = 1;
}
} else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
// Possible device root
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2 && isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid unnecessary
// work
return '\\';
}

let tail = rootEnd < len ?
Expand Down Expand Up @@ -592,75 +582,66 @@ const win32 = {
const len = path.length;
if (len === 0)
return '.';
var rootEnd = -1;
var end = -1;
var matchedSlash = true;
var offset = 0;
let rootEnd = -1;
let offset = 0;
const code = path.charCodeAt(0);

if (len === 1) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work or a dot.
return isPathSeparator(code) ? path : '.';
}

// Try to match a root
if (len > 1) {
if (isPathSeparator(code)) {
// Possible UNC root

rootEnd = offset = 1;

if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
var j = 2;
var last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
if (isPathSeparator(code)) {
// Possible UNC root

rootEnd = offset = 1;

if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j)))
break;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
}
if (j === len) {
// We matched a UNC root only
return path;
}
if (j !== last) {
// We matched a UNC root with leftovers
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;
}
// 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 (isWindowsDeviceRoot(code)) {
// Possible device root

if (path.charCodeAt(1) === CHAR_COLON) {
rootEnd = offset = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2)))
rootEnd = offset = 3;
}
}
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work
return path;
// Possible device root
} else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
rootEnd = len > 2 && isPathSeparator(path.charCodeAt(2)) ? 3 : 2;
offset = rootEnd;
}

let end = -1;
let matchedSlash = true;
for (var i = len - 1; i >= offset; --i) {
if (isPathSeparator(path.charCodeAt(i))) {
if (!matchedSlash) {
Expand Down Expand Up @@ -843,79 +824,71 @@ const win32 = {
var rootEnd = 0;
let code = path.charCodeAt(0);

// Try to match a root
if (len > 1) {
if (len === 1) {
if (isPathSeparator(code)) {
// Possible UNC root
// `path` contains just a path separator, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
return ret;
}
// Try to match a root
if (isPathSeparator(code)) {
// Possible UNC root

rootEnd = 1;
if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
var j = 2;
var last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
rootEnd = 1;
if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j)))
break;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j)))
break;
}
if (j === len) {
// We matched a UNC root only

rootEnd = j;
} else if (j !== last) {
// We matched a UNC root with leftovers

rootEnd = j + 1;
}
if (j === len) {
// We matched a UNC root only
rootEnd = j;
} else if (j !== last) {
// We matched a UNC root with leftovers
rootEnd = j + 1;
}
}
}
} else if (isWindowsDeviceRoot(code)) {
// Possible device root

if (path.charCodeAt(1) === CHAR_COLON) {
rootEnd = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2))) {
if (len === 3) {
// `path` contains just a drive root, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
rootEnd = 3;
}
} else {
// `path` contains just a drive root, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
}
} else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
// Possible device root
if (len <= 2) {
// `path` contains just a drive root, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
rootEnd = 2;
if (isPathSeparator(path.charCodeAt(2))) {
if (len === 3) {
// `path` contains just a drive root, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
rootEnd = 3;
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}

if (rootEnd > 0)
ret.root = path.slice(0, rootEnd);

Expand Down

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