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