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81 lines
1.3 KiB
JavaScript
81 lines
1.3 KiB
JavaScript
'use strict';
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var ESCAPES = [
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'\u001b',
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'\u009b'
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];
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var END_CODE = 39;
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var ESCAPE_CODES = {
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0: 0,
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1: 22,
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2: 22,
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3: 23,
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4: 24,
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7: 27,
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8: 28,
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9: 29,
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30: 39,
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31: 39,
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32: 39,
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33: 39,
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34: 39,
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35: 39,
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36: 39,
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37: 39,
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90: 39,
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40: 49,
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41: 49,
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42: 49,
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43: 49,
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44: 49,
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45: 49,
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46: 49,
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47: 49
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};
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function wrapAnsi(code) {
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return ESCAPES[0] + '[' + code + 'm';
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}
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module.exports = function (str, begin, end) {
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end = end || str.length;
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var insideEscape = false;
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var escapeCode;
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var visible = 0;
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var output = '';
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for (var i = 0; i < str.length; i++) {
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var leftEscape = false;
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var x = str[i];
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if (ESCAPES.indexOf(x) !== -1) {
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insideEscape = true;
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var code = /[0-9][^m]*/.exec(str.slice(i, i + 4));
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escapeCode = code === END_CODE ? null : code;
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} else if (insideEscape && x === 'm') {
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insideEscape = false;
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leftEscape = true;
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}
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if (!insideEscape && !leftEscape) {
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++visible;
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}
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if (visible > begin && visible <= end) {
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output += x;
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} else if (visible === begin && escapeCode !== undefined && escapeCode !== END_CODE) {
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output += wrapAnsi(escapeCode);
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} else if (visible >= end) {
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if (escapeCode !== undefined) {
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output += wrapAnsi(ESCAPE_CODES[escapeCode] || END_CODE);
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}
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break;
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}
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}
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return output;
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};
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