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			215 lines
		
	
	
		
			5.6 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			215 lines
		
	
	
		
			5.6 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
import stringWidth from 'string-width';
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import stripAnsi from 'strip-ansi';
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import ansiStyles from 'ansi-styles';
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const ESCAPES = new Set([
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	'\u001B',
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	'\u009B',
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]);
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const END_CODE = 39;
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const ANSI_ESCAPE_BELL = '\u0007';
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const ANSI_CSI = '[';
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const ANSI_OSC = ']';
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const ANSI_SGR_TERMINATOR = 'm';
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const ANSI_ESCAPE_LINK = `${ANSI_OSC}8;;`;
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const wrapAnsiCode = code => `${ESCAPES.values().next().value}${ANSI_CSI}${code}${ANSI_SGR_TERMINATOR}`;
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const wrapAnsiHyperlink = uri => `${ESCAPES.values().next().value}${ANSI_ESCAPE_LINK}${uri}${ANSI_ESCAPE_BELL}`;
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// Calculate the length of words split on ' ', ignoring
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// the extra characters added by ansi escape codes
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const wordLengths = string => string.split(' ').map(character => stringWidth(character));
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// Wrap a long word across multiple rows
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// Ansi escape codes do not count towards length
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const wrapWord = (rows, word, columns) => {
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	const characters = [...word];
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	let isInsideEscape = false;
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	let isInsideLinkEscape = false;
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	let visible = stringWidth(stripAnsi(rows[rows.length - 1]));
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	for (const [index, character] of characters.entries()) {
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		const characterLength = stringWidth(character);
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		if (visible + characterLength <= columns) {
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			rows[rows.length - 1] += character;
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		} else {
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			rows.push(character);
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			visible = 0;
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		}
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		if (ESCAPES.has(character)) {
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			isInsideEscape = true;
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			isInsideLinkEscape = characters.slice(index + 1).join('').startsWith(ANSI_ESCAPE_LINK);
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		}
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		if (isInsideEscape) {
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			if (isInsideLinkEscape) {
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				if (character === ANSI_ESCAPE_BELL) {
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					isInsideEscape = false;
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					isInsideLinkEscape = false;
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				}
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			} else if (character === ANSI_SGR_TERMINATOR) {
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				isInsideEscape = false;
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			}
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			continue;
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		}
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		visible += characterLength;
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		if (visible === columns && index < characters.length - 1) {
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			rows.push('');
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			visible = 0;
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		}
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	}
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	// It's possible that the last row we copy over is only
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	// ansi escape characters, handle this edge-case
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	if (!visible && rows[rows.length - 1].length > 0 && rows.length > 1) {
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		rows[rows.length - 2] += rows.pop();
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	}
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};
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// Trims spaces from a string ignoring invisible sequences
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const stringVisibleTrimSpacesRight = string => {
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	const words = string.split(' ');
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	let last = words.length;
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	while (last > 0) {
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		if (stringWidth(words[last - 1]) > 0) {
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			break;
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		}
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		last--;
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	}
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	if (last === words.length) {
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		return string;
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	}
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	return words.slice(0, last).join(' ') + words.slice(last).join('');
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};
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// The wrap-ansi module can be invoked in either 'hard' or 'soft' wrap mode
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//
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// 'hard' will never allow a string to take up more than columns characters
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//
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// 'soft' allows long words to expand past the column length
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const exec = (string, columns, options = {}) => {
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	if (options.trim !== false && string.trim() === '') {
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		return '';
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	}
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	let returnValue = '';
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	let escapeCode;
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	let escapeUrl;
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	const lengths = wordLengths(string);
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	let rows = [''];
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	for (const [index, word] of string.split(' ').entries()) {
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		if (options.trim !== false) {
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			rows[rows.length - 1] = rows[rows.length - 1].trimStart();
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		}
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		let rowLength = stringWidth(rows[rows.length - 1]);
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		if (index !== 0) {
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			if (rowLength >= columns && (options.wordWrap === false || options.trim === false)) {
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				// If we start with a new word but the current row length equals the length of the columns, add a new row
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				rows.push('');
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				rowLength = 0;
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			}
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			if (rowLength > 0 || options.trim === false) {
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				rows[rows.length - 1] += ' ';
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				rowLength++;
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			}
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		}
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		// In 'hard' wrap mode, the length of a line is never allowed to extend past 'columns'
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		if (options.hard && lengths[index] > columns) {
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			const remainingColumns = (columns - rowLength);
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			const breaksStartingThisLine = 1 + Math.floor((lengths[index] - remainingColumns - 1) / columns);
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			const breaksStartingNextLine = Math.floor((lengths[index] - 1) / columns);
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			if (breaksStartingNextLine < breaksStartingThisLine) {
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				rows.push('');
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			}
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			wrapWord(rows, word, columns);
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			continue;
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		}
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		if (rowLength + lengths[index] > columns && rowLength > 0 && lengths[index] > 0) {
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			if (options.wordWrap === false && rowLength < columns) {
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				wrapWord(rows, word, columns);
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				continue;
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			}
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			rows.push('');
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		}
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		if (rowLength + lengths[index] > columns && options.wordWrap === false) {
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			wrapWord(rows, word, columns);
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			continue;
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		}
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		rows[rows.length - 1] += word;
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	}
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	if (options.trim !== false) {
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		rows = rows.map(row => stringVisibleTrimSpacesRight(row));
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	}
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	const pre = [...rows.join('\n')];
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	for (const [index, character] of pre.entries()) {
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		returnValue += character;
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		if (ESCAPES.has(character)) {
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			const {groups} = new RegExp(`(?:\\${ANSI_CSI}(?<code>\\d+)m|\\${ANSI_ESCAPE_LINK}(?<uri>.*)${ANSI_ESCAPE_BELL})`).exec(pre.slice(index).join('')) || {groups: {}};
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			if (groups.code !== undefined) {
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				const code = Number.parseFloat(groups.code);
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				escapeCode = code === END_CODE ? undefined : code;
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			} else if (groups.uri !== undefined) {
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				escapeUrl = groups.uri.length === 0 ? undefined : groups.uri;
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			}
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		}
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		const code = ansiStyles.codes.get(Number(escapeCode));
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		if (pre[index + 1] === '\n') {
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			if (escapeUrl) {
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				returnValue += wrapAnsiHyperlink('');
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			}
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			if (escapeCode && code) {
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				returnValue += wrapAnsiCode(code);
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			}
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		} else if (character === '\n') {
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			if (escapeCode && code) {
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				returnValue += wrapAnsiCode(escapeCode);
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			}
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			if (escapeUrl) {
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				returnValue += wrapAnsiHyperlink(escapeUrl);
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			}
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		}
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	}
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	return returnValue;
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};
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// For each newline, invoke the method separately
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export default function wrapAnsi(string, columns, options) {
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	return String(string)
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		.normalize()
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		.replace(/\r\n/g, '\n')
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		.split('\n')
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		.map(line => exec(line, columns, options))
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		.join('\n');
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}
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