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util: extract out encoding validation functions #18421

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util: extract out encoding validation functions #18421

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f06ac13
Extract out encoding validation functions
timotew Jan 28, 2018
8f4a276
splitting out validateEncoder() and validateDecoder()
timotew Jan 29, 2018
b83472d
remove check for isArrayBufferView
timotew Jan 31, 2018
9ee5f96
split the buffer validation
timotew Jan 31, 2018
077c258
revert validate buffer
timotew Jan 31, 2018
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59 changes: 29 additions & 30 deletions lib/internal/encoding.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,21 @@ function lazyBuffer() {
return Buffer;
}

function validateEncoder(obj) {
if (obj == null || obj[kEncoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextEncoder');
}

function validateDecoder(obj) {
if (obj == null || obj[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
}

function validateArgument(prop, expected, propName) {
if (typeof prop !== expected.toLowerCase())
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Using toLowerCase is a performance overhead.

I suggest to either split the validation in two functions or to just keep these validations as they were. You can of course also add a fourth argument.

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@BridgeAR is this last commit inline with your suggestion?

throw new errors.Error('ERR_INVALID_ARG_TYPE', propName, expected);
}

const CONVERTER_FLAGS_FLUSH = 0x1;
const CONVERTER_FLAGS_FATAL = 0x2;
const CONVERTER_FLAGS_IGNORE_BOM = 0x4;
Expand Down Expand Up @@ -288,20 +303,17 @@ class TextEncoder {
}

get encoding() {
if (this == null || this[kEncoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextEncoder');
validateEncoder(this);
return 'utf-8';
}

encode(input = '') {
if (this == null || this[kEncoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextEncoder');
validateEncoder(this);
return encodeUtf8String(`${input}`);
}

[inspect](depth, opts) {
if (this == null || this[kEncoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextEncoder');
validateEncoder(this);
if (typeof depth === 'number' && depth < 0)
return opts.stylize('[Object]', 'special');
var ctor = getConstructorOf(this);
Expand Down Expand Up @@ -329,8 +341,7 @@ const { hasConverter, TextDecoder } =
makeTextDecoderJS();

function hasTextDecoder(encoding = 'utf-8') {
if (typeof encoding !== 'string')
throw new errors.Error('ERR_INVALID_ARG_TYPE', 'encoding', 'string');
validateArgument(encoding, 'string', 'encoding');
return hasConverter(getEncodingFromLabel(encoding));
}

Expand All @@ -344,8 +355,7 @@ function makeTextDecoderICU() {
class TextDecoder {
constructor(encoding = 'utf-8', options = {}) {
encoding = `${encoding}`;
if (typeof options !== 'object')
throw new errors.Error('ERR_INVALID_ARG_TYPE', 'options', 'Object');
validateArgument(options, 'Object', 'options');

const enc = getEncodingFromLabel(encoding);
if (enc === undefined)
Expand All @@ -369,17 +379,14 @@ function makeTextDecoderICU() {


decode(input = empty, options = {}) {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
if (isArrayBuffer(input)) {
input = lazyBuffer().from(input);
} else if (!isArrayBufferView(input)) {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'input',
['ArrayBuffer', 'ArrayBufferView']);
}
if (typeof options !== 'object') {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'options', 'Object');
}
validateArgument(options, 'Object', 'options');

var flags = 0;
if (options !== null)
Expand Down Expand Up @@ -416,8 +423,7 @@ function makeTextDecoderJS() {
class TextDecoder {
constructor(encoding = 'utf-8', options = {}) {
encoding = `${encoding}`;
if (typeof options !== 'object')
throw new errors.Error('ERR_INVALID_ARG_TYPE', 'options', 'Object');
validateArgument(options, 'Object', 'options');

const enc = getEncodingFromLabel(encoding);
if (enc === undefined || !hasConverter(enc))
Expand All @@ -440,8 +446,7 @@ function makeTextDecoderJS() {
}

decode(input = empty, options = {}) {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
if (isArrayBuffer(input)) {
input = lazyBuffer().from(input);
} else if (isArrayBufferView(input)) {
Expand All @@ -451,9 +456,7 @@ function makeTextDecoderJS() {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'input',
['ArrayBuffer', 'ArrayBufferView']);
}
if (typeof options !== 'object') {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'options', 'Object');
}
validateArgument(options, 'Object', 'options');

if (this[kFlags] & CONVERTER_FLAGS_FLUSH) {
this[kBOMSeen] = false;
Expand Down Expand Up @@ -496,27 +499,23 @@ function makeTextDecoderJS() {
TextDecoder.prototype,
Object.getOwnPropertyDescriptors({
get encoding() {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
return this[kEncoding];
},

get fatal() {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
return (this[kFlags] & CONVERTER_FLAGS_FATAL) === CONVERTER_FLAGS_FATAL;
},

get ignoreBOM() {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
return (this[kFlags] & CONVERTER_FLAGS_IGNORE_BOM) ===
CONVERTER_FLAGS_IGNORE_BOM;
},

[inspect](depth, opts) {
if (this == null || this[kDecoder] !== true)
throw new errors.TypeError('ERR_INVALID_THIS', 'TextDecoder');
validateDecoder(this);
if (typeof depth === 'number' && depth < 0)
return opts.stylize('[Object]', 'special');
var ctor = getConstructorOf(this);
Expand Down