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1 files changed, 88 insertions, 0 deletions

diff --git a/node_modules/slice-ansi/index.js b/node_modules/slice-ansi/index.js
new file mode 100755
index 00000000..634ee9c7
--- /dev/null
+++ b/node_modules/slice-ansi/index.js
@@ -0,0 +1,88 @@
+'use strict';
+const isFullwidthCodePoint = require('is-fullwidth-code-point');
+
+const ESCAPES = [
+	'\u001B',
+	'\u009B'
+];
+
+const END_CODE = 39;
+const ASTRAL_REGEX = /[\uD800-\uDBFF][\uDC00-\uDFFF]/;
+
+const ESCAPE_CODES = new Map([
+	[0, 0],
+	[1, 22],
+	[2, 22],
+	[3, 23],
+	[4, 24],
+	[7, 27],
+	[8, 28],
+	[9, 29],
+	[30, 39],
+	[31, 39],
+	[32, 39],
+	[33, 39],
+	[34, 39],
+	[35, 39],
+	[36, 39],
+	[37, 39],
+	[90, 39],
+	[40, 49],
+	[41, 49],
+	[42, 49],
+	[43, 49],
+	[44, 49],
+	[45, 49],
+	[46, 49],
+	[47, 49]
+]);
+
+const wrapAnsi = code => `${ESCAPES[0]}[${code}m`;
+
+module.exports = (str, begin, end) => {
+	const arr = Array.from(str.normalize());
+
+	end = typeof end === 'number' ? end : arr.length;
+
+	let insideEscape = false;
+	let escapeCode;
+	let visible = 0;
+	let output = '';
+
+	for (const item of arr.entries()) {
+		const i = item[0];
+		const x = item[1];
+
+		let leftEscape = false;
+
+		if (ESCAPES.indexOf(x) !== -1) {
+			insideEscape = true;
+			const code = /\d[^m]*/.exec(str.slice(i, i + 4));
+			escapeCode = code === END_CODE ? null : code;
+		} else if (insideEscape && x === 'm') {
+			insideEscape = false;
+			leftEscape = true;
+		}
+
+		if (!insideEscape && !leftEscape) {
+			++visible;
+		}
+
+		if (!ASTRAL_REGEX.test(x) && isFullwidthCodePoint(x.codePointAt())) {
+			++visible;
+		}
+
+		if (visible > begin && visible <= end) {
+			output += x;
+		} else if (visible === begin && !insideEscape && escapeCode !== undefined && escapeCode !== END_CODE) {
+			output += wrapAnsi(escapeCode);
+		} else if (visible >= end) {
+			if (escapeCode !== undefined) {
+				output += wrapAnsi(ESCAPE_CODES.get(parseInt(escapeCode, 10)) || END_CODE);
+			}
+			break;
+		}
+	}
+
+	return output;
+};