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readline: use named constant for surrogate checks #28638

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merged 1 commit into from
Jul 13, 2019
Merged

readline: use named constant for surrogate checks #28638

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5 changes: 3 additions & 2 deletions lib/internal/readline.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
const ansi =
/[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g;
/* eslint-enable no-control-regex */

const kUTF16SurrogateThreshold = 0x10000; // 2 ** 16
const kEscape = '\x1b';

let getStringWidth;
Expand Down Expand Up @@ -63,7 +63,7 @@ if (internalBinding('config').hasIntl) {
for (var i = 0; i < str.length; i++) {
const code = str.codePointAt(i);

if (code >= 0x10000) { // surrogates
if (code >= kUTF16SurrogateThreshold) { // Surrogates.
i++;
}

Expand Down Expand Up @@ -434,6 +434,7 @@ module.exports = {
emitKeys,
getStringWidth,
isFullWidthCodePoint,
kUTF16SurrogateThreshold,
stripVTControlCharacters,
CSI
};
9 changes: 5 additions & 4 deletions lib/readline.js
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ const {
emitKeys,
getStringWidth,
isFullWidthCodePoint,
kUTF16SurrogateThreshold,
stripVTControlCharacters
} = require('internal/readline');

Expand Down Expand Up @@ -600,8 +601,8 @@ Interface.prototype._wordRight = function() {
function charLengthLeft(str, i) {
if (i <= 0)
return 0;
if (i > 1 && str.codePointAt(i - 2) >= 2 ** 16 ||
str.codePointAt(i - 1) >= 2 ** 16) {
if (i > 1 && str.codePointAt(i - 2) >= kUTF16SurrogateThreshold ||
str.codePointAt(i - 1) >= kUTF16SurrogateThreshold) {
return 2;
}
return 1;
Expand All @@ -610,7 +611,7 @@ function charLengthLeft(str, i) {
function charLengthAt(str, i) {
if (str.length <= i)
return 0;
return str.codePointAt(i) >= 2 ** 16 ? 2 : 1;
return str.codePointAt(i) >= kUTF16SurrogateThreshold ? 2 : 1;
}

Interface.prototype._deleteLeft = function() {
Expand Down Expand Up @@ -728,7 +729,7 @@ Interface.prototype._getDisplayPos = function(str) {
str = stripVTControlCharacters(str);
for (var i = 0, len = str.length; i < len; i++) {
code = str.codePointAt(i);
if (code >= 0x10000) { // surrogates
if (code >= kUTF16SurrogateThreshold) { // Surrogates.
i++;
}
if (code === 0x0a) { // new line \n
Expand Down