70 lines
2.0 KiB
JavaScript
70 lines
2.0 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.default = wrapAnsiString;
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/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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// word-wrap a string that contains ANSI escape sequences.
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// ANSI escape sequences do not add to the string length.
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function wrapAnsiString(string, terminalWidth) {
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if (terminalWidth === 0) {
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// if the terminal width is zero, don't bother word-wrapping
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return string;
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}
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const ANSI_REGEXP = /[\u001b\u009b]\[\d{1,2}m/gu;
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const tokens = [];
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let lastIndex = 0;
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let match;
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while ((match = ANSI_REGEXP.exec(string))) {
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const ansi = match[0];
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const index = match.index;
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if (index != lastIndex) {
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tokens.push(['string', string.slice(lastIndex, index)]);
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}
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tokens.push(['ansi', ansi]);
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lastIndex = index + ansi.length;
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}
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if (lastIndex != string.length - 1) {
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tokens.push(['string', string.slice(lastIndex, string.length)]);
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}
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let lastLineLength = 0;
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return tokens
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.reduce(
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(lines, [kind, token]) => {
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if (kind === 'string') {
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if (lastLineLength + token.length > terminalWidth) {
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while (token.length) {
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const chunk = token.slice(0, terminalWidth - lastLineLength);
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const remaining = token.slice(
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terminalWidth - lastLineLength,
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token.length
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);
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lines[lines.length - 1] += chunk;
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lastLineLength += chunk.length;
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token = remaining;
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if (token.length) {
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lines.push('');
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lastLineLength = 0;
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}
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}
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} else {
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lines[lines.length - 1] += token;
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lastLineLength += token.length;
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}
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} else {
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lines[lines.length - 1] += token;
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}
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return lines;
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},
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['']
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)
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.join('\n');
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}
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