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fs: minor refactoring
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1. Remove a few unnecessary variables to reduce LoC.

2. Remove redundant `var` definitions of variables in same function.

3. Refactor variables which are defined inside a block and used outside
as well.

4. Refactor effect-less code.

5. In `rethrow` function, instead of assigning to `err` and throwing
`err` directly throw `backtrace` object.

6. Reassign a defined parameter while also mentioning arguments in the
body is one of the optimization killers. So, changing `callback` to
`callback_` and declaring a new variable called `callback` in the body.

PR-URL: #1870
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Trevor Norris <[email protected]>
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@thefourtheye @trevnorris
thefourtheye authored and trevnorris committed Jun 10, 2015
1 parent 8841132 commit a011c32
Showing 1 changed file with 29 additions and 28 deletions.
57 changes: 29 additions & 28 deletions lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,7 @@ function rethrow() {
if (err) {
backtrace.stack = err.name + ': ' + err.message +
backtrace.stack.substr(backtrace.name.length);
err = backtrace;
throw err;
throw backtrace;
}
};
}
Expand Down Expand Up @@ -267,27 +266,25 @@ function ReadFileContext(callback, encoding) {
}

ReadFileContext.prototype.read = function() {
var fd = this.fd;
var size = this.size;
var buffer;
var offset;
var length;

if (size === 0) {
if (this.size === 0) {
buffer = this.buffer = new SlowBuffer(kReadFileBufferLength);
offset = 0;
length = kReadFileBufferLength;
} else {
buffer = this.buffer;
offset = this.pos;
length = size - this.pos;
length = this.size - this.pos;
}

var req = new FSReqWrap();
req.oncomplete = readFileAfterRead;
req.context = this;

binding.read(fd, buffer, offset, length, -1, req);
binding.read(this.fd, buffer, offset, length, -1, req);
};

ReadFileContext.prototype.close = function(err) {
Expand All @@ -302,8 +299,7 @@ function readFileAfterOpen(err, fd) {
var context = this.context;

if (err) {
var callback = context.callback;
callback(err);
context.callback(err);
return;
}

Expand Down Expand Up @@ -417,7 +413,7 @@ fs.readFileSync = function(path, options) {
if (size === 0) {
buffers = [];
} else {
var threw = true;
threw = true;
try {
buffer = new Buffer(size);
threw = false;
Expand All @@ -427,16 +423,18 @@ fs.readFileSync = function(path, options) {
}

var done = false;
var bytesRead;

while (!done) {
var threw = true;
threw = true;
try {
if (size !== 0) {
var bytesRead = fs.readSync(fd, buffer, pos, size - pos);
bytesRead = fs.readSync(fd, buffer, pos, size - pos);
} else {
// the kernel lies about many files.
// Go ahead and try to read some bytes.
buffer = new Buffer(8192);
var bytesRead = fs.readSync(fd, buffer, 0, 8192);
bytesRead = fs.readSync(fd, buffer, 0, 8192);
if (bytesRead) {
buffers.push(buffer.slice(0, bytesRead));
}
Expand Down Expand Up @@ -529,8 +527,8 @@ function modeNum(m, def) {
return undefined;
}

fs.open = function(path, flags, mode, callback) {
callback = makeCallback(arguments[arguments.length - 1]);
fs.open = function(path, flags, mode, callback_) {
var callback = makeCallback(arguments[arguments.length - 1]);
mode = modeNum(mode, 0o666);

if (!nullCheck(path, callback)) return;
Expand Down Expand Up @@ -585,10 +583,12 @@ fs.read = function(fd, buffer, offset, length, position, callback) {

fs.readSync = function(fd, buffer, offset, length, position) {
var legacy = false;
var encoding;

if (!(buffer instanceof Buffer)) {
// legacy string interface (fd, length, position, encoding, callback)
legacy = true;
var encoding = arguments[3];
encoding = arguments[3];

assertEncoding(encoding);

Expand Down Expand Up @@ -623,14 +623,14 @@ fs.write = function(fd, buffer, offset, length, position, callback) {
callback(err, written || 0, buffer);
}

var req = new FSReqWrap();
if (buffer instanceof Buffer) {
// if no position is passed then assume null
if (typeof position === 'function') {
callback = position;
position = null;
}
callback = maybeCallback(callback);
var req = new FSReqWrap();
req.oncomplete = strWrapper;
return binding.writeBuffer(fd, buffer, offset, length, position, req);
}
Expand All @@ -647,7 +647,6 @@ fs.write = function(fd, buffer, offset, length, position, callback) {
length = 'utf8';
}
callback = maybeCallback(position);
var req = new FSReqWrap();
req.oncomplete = bufWrapper;
return binding.writeString(fd, buffer, offset, length, req);
};
Expand Down Expand Up @@ -721,8 +720,10 @@ fs.truncateSync = function(path, len) {
}
// allow error to be thrown, but still close fd.
var fd = fs.openSync(path, 'r+');
var ret;

try {
var ret = fs.ftruncateSync(fd, len);
ret = fs.ftruncateSync(fd, len);
} finally {
fs.closeSync(fd);
}
Expand Down Expand Up @@ -875,7 +876,7 @@ function preprocessSymlinkDestination(path, type, linkPath) {
}
}

fs.symlink = function(destination, path, type_, callback) {
fs.symlink = function(destination, path, type_, callback_) {
var type = (typeof type_ === 'string' ? type_ : null);
var callback = makeCallback(arguments[arguments.length - 1]);

Expand Down Expand Up @@ -968,9 +969,9 @@ if (constants.hasOwnProperty('O_SYMLINK')) {

// prefer to return the chmod error, if one occurs,
// but still try to close, and report closing errors if they occur.
var err, err2;
var err, err2, ret;
try {
var ret = fs.fchmodSync(fd, mode);
ret = fs.fchmodSync(fd, mode);
} catch (er) {
err = er;
}
Expand Down Expand Up @@ -1088,8 +1089,8 @@ fs.futimesSync = function(fd, atime, mtime) {
binding.futimes(fd, atime, mtime);
};

function writeAll(fd, buffer, offset, length, position, callback) {
callback = maybeCallback(arguments[arguments.length - 1]);
function writeAll(fd, buffer, offset, length, position, callback_) {
var callback = maybeCallback(arguments[arguments.length - 1]);

// write(fd, buffer, offset, length, position, callback)
fs.write(fd, buffer, offset, length, position, function(writeErr, written) {
Expand All @@ -1112,7 +1113,7 @@ function writeAll(fd, buffer, offset, length, position, callback) {
});
}

fs.writeFile = function(path, data, options, callback) {
fs.writeFile = function(path, data, options, callback_) {
var callback = maybeCallback(arguments[arguments.length - 1]);

if (!options || typeof options === 'function') {
Expand Down Expand Up @@ -1634,8 +1635,8 @@ function ReadStream(path, options) {
this.flags = options.flags === undefined ? 'r' : options.flags;
this.mode = options.mode === undefined ? 0o666 : options.mode;

this.start = options.start === undefined ? undefined : options.start;
this.end = options.end === undefined ? undefined : options.end;
this.start = options.start;
this.end = options.end;
this.autoClose = options.autoClose === undefined ? true : options.autoClose;
this.pos = undefined;

Expand Down Expand Up @@ -1804,7 +1805,7 @@ function WriteStream(path, options) {
this.flags = options.flags === undefined ? 'w' : options.flags;
this.mode = options.mode === undefined ? 0o666 : options.mode;

this.start = options.start === undefined ? undefined : options.start;
this.start = options.start;
this.pos = undefined;
this.bytesWritten = 0;

Expand Down

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