First upload version 0.0.1

node_modules/slice-ansi/index.js

@@ -0,0 +1,169 @@
+import ansiStyles from 'ansi-styles';
+import isFullwidthCodePoint from 'is-fullwidth-code-point';
+
+// \x1b and \x9b
+const ESCAPES = new Set([27, 155]);
+
+const CODE_POINT_0 = '0'.codePointAt(0);
+const CODE_POINT_9 = '9'.codePointAt(0);
+
+const MAX_ANSI_SEQUENCE_LENGTH = 19;
+
+const endCodesSet = new Set();
+const endCodesMap = new Map();
+for (const [start, end] of ansiStyles.codes) {
+	endCodesSet.add(ansiStyles.color.ansi(end));
+	endCodesMap.set(ansiStyles.color.ansi(start), ansiStyles.color.ansi(end));
+}
+
+function getEndCode(code) {
+	if (endCodesSet.has(code)) {
+		return code;
+	}
+
+	if (endCodesMap.has(code)) {
+		return endCodesMap.get(code);
+	}
+
+	code = code.slice(2);
+	if (code.includes(';')) {
+		code = code[0] + '0';
+	}
+
+	const returnValue = ansiStyles.codes.get(Number.parseInt(code, 10));
+	if (returnValue) {
+		return ansiStyles.color.ansi(returnValue);
+	}
+
+	return ansiStyles.reset.open;
+}
+
+function findNumberIndex(string) {
+	for (let index = 0; index < string.length; index++) {
+		const codePoint = string.codePointAt(index);
+		if (codePoint >= CODE_POINT_0 && codePoint <= CODE_POINT_9) {
+			return index;
+		}
+	}
+
+	return -1;
+}
+
+function parseAnsiCode(string, offset) {
+	string = string.slice(offset, offset + MAX_ANSI_SEQUENCE_LENGTH);
+	const startIndex = findNumberIndex(string);
+	if (startIndex !== -1) {
+		let endIndex = string.indexOf('m', startIndex);
+		if (endIndex === -1) {
+			endIndex = string.length;
+		}
+
+		return string.slice(0, endIndex + 1);
+	}
+}
+
+function tokenize(string, endCharacter = Number.POSITIVE_INFINITY) {
+	const returnValue = [];
+
+	let index = 0;
+	let visibleCount = 0;
+	while (index < string.length) {
+		const codePoint = string.codePointAt(index);
+
+		if (ESCAPES.has(codePoint)) {
+			const code = parseAnsiCode(string, index);
+			if (code) {
+				returnValue.push({
+					type: 'ansi',
+					code,
+					endCode: getEndCode(code),
+				});
+				index += code.length;
+				continue;
+			}
+		}
+
+		const isFullWidth = isFullwidthCodePoint(codePoint);
+		const character = String.fromCodePoint(codePoint);
+
+		returnValue.push({
+			type: 'character',
+			value: character,
+			isFullWidth,
+		});
+
+		index += character.length;
+		visibleCount += isFullWidth ? 2 : character.length;
+
+		if (visibleCount >= endCharacter) {
+			break;
+		}
+	}
+
+	return returnValue;
+}
+
+function reduceAnsiCodes(codes) {
+	let returnValue = [];
+
+	for (const code of codes) {
+		if (code.code === ansiStyles.reset.open) {
+			// Reset code, disable all codes
+			returnValue = [];
+		} else if (endCodesSet.has(code.code)) {
+			// This is an end code, disable all matching start codes
+			returnValue = returnValue.filter(returnValueCode => returnValueCode.endCode !== code.code);
+		} else {
+			// This is a start code. Disable all styles this "overrides", then enable it
+			returnValue = returnValue.filter(returnValueCode => returnValueCode.endCode !== code.endCode);
+			returnValue.push(code);
+		}
+	}
+
+	return returnValue;
+}
+
+function undoAnsiCodes(codes) {
+	const reduced = reduceAnsiCodes(codes);
+	const endCodes = reduced.map(({endCode}) => endCode);
+	return endCodes.reverse().join('');
+}
+
+export default function sliceAnsi(string, start, end) {
+	const tokens = tokenize(string, end);
+	let activeCodes = [];
+	let position = 0;
+	let returnValue = '';
+	let include = false;
+
+	for (const token of tokens) {
+		if (end !== undefined && position >= end) {
+			break;
+		}
+
+		if (token.type === 'ansi') {
+			activeCodes.push(token);
+			if (include) {
+				returnValue += token.code;
+			}
+		} else {
+			// Character
+			if (!include && position >= start) {
+				include = true;
+				// Simplify active codes
+				activeCodes = reduceAnsiCodes(activeCodes);
+				returnValue = activeCodes.map(({code}) => code).join('');
+			}
+
+			if (include) {
+				returnValue += token.value;
+			}
+
+			position += token.isFullWidth ? 2 : token.value.length;
+		}
+	}
+
+	// Disable active codes at the end
+	returnValue += undoAnsiCodes(activeCodes);
+	return returnValue;
+}