src/third_party/devtools/node_modules/yargs/node_modules/cliui/index.js - cobalt - Git at Google

 'use strict'

 const stringWidth = require('string-width')
 const stripAnsi = require('strip-ansi')
 const wrap = require('wrap-ansi')

 const align = {
   right: alignRight,
   center: alignCenter
 }
 const top = 0
 const right = 1
 const bottom = 2
 const left = 3

 class UI {
   constructor (opts) {
     this.width = opts.width
     this.wrap = opts.wrap
     this.rows = []
   }

   span (...args) {
     const cols = this.div(...args)
     cols.span = true
   }

   resetOutput () {
     this.rows = []
   }

   div (...args) {
     if (args.length === 0) {
       this.div('')
     }

     if (this.wrap && this._shouldApplyLayoutDSL(...args)) {
       return this._applyLayoutDSL(args[0])
     }

     const cols = args.map(arg => {
       if (typeof arg === 'string') {
         return this._colFromString(arg)
       }

       return arg
     })

     this.rows.push(cols)
     return cols
   }

   _shouldApplyLayoutDSL (...args) {
     return args.length === 1 && typeof args[0] === 'string' &&
       /[\t\n]/.test(args[0])
   }

   _applyLayoutDSL (str) {
     const rows = str.split('\n').map(row => row.split('\t'))
     let leftColumnWidth = 0

     // simple heuristic for layout, make sure the
     // second column lines up along the left-hand.
     // don't allow the first column to take up more
     // than 50% of the screen.
     rows.forEach(columns => {
       if (columns.length > 1 && stringWidth(columns[0]) > leftColumnWidth) {
         leftColumnWidth = Math.min(
           Math.floor(this.width * 0.5),
           stringWidth(columns[0])
         )
       }
     })

     // generate a table:
     //  replacing ' ' with padding calculations.
     //  using the algorithmically generated width.
     rows.forEach(columns => {
       this.div(...columns.map((r, i) => {
         return {
           text: r.trim(),
           padding: this._measurePadding(r),
           width: (i === 0 && columns.length > 1) ? leftColumnWidth : undefined
         }
       }))
     })

     return this.rows[this.rows.length - 1]
   }

   _colFromString (text) {
     return {
       text,
       padding: this._measurePadding(text)
     }
   }

   _measurePadding (str) {
     // measure padding without ansi escape codes
     const noAnsi = stripAnsi(str)
     return [0, noAnsi.match(/\s*$/)[0].length, 0, noAnsi.match(/^\s*/)[0].length]
   }

   toString () {
     const lines = []

     this.rows.forEach(row => {
       this.rowToString(row, lines)
     })

     // don't display any lines with the
     // hidden flag set.
     return lines
       .filter(line => !line.hidden)
       .map(line => line.text)
       .join('\n')
   }

   rowToString (row, lines) {
     this._rasterize(row).forEach((rrow, r) => {
       let str = ''
       rrow.forEach((col, c) => {
         const { width } = row[c] // the width with padding.
         const wrapWidth = this._negatePadding(row[c]) // the width without padding.

         let ts = col // temporary string used during alignment/padding.

         if (wrapWidth > stringWidth(col)) {
           ts += ' '.repeat(wrapWidth - stringWidth(col))
         }

         // align the string within its column.
         if (row[c].align && row[c].align !== 'left' && this.wrap) {
           ts = align[row[c].align](ts, wrapWidth)
           if (stringWidth(ts) < wrapWidth) {
             ts += ' '.repeat(width - stringWidth(ts) - 1)
           }
         }

         // apply border and padding to string.
         const padding = row[c].padding || [0, 0, 0, 0]
         if (padding[left]) {
           str += ' '.repeat(padding[left])
         }

         str += addBorder(row[c], ts, '| ')
         str += ts
         str += addBorder(row[c], ts, ' |')
         if (padding[right]) {
           str += ' '.repeat(padding[right])
         }

         // if prior row is span, try to render the
         // current row on the prior line.
         if (r === 0 && lines.length > 0) {
           str = this._renderInline(str, lines[lines.length - 1])
         }
       })

       // remove trailing whitespace.
       lines.push({
         text: str.replace(/ +$/, ''),
         span: row.span
       })
     })

     return lines
   }

   // if the full 'source' can render in
   // the target line, do so.
   _renderInline (source, previousLine) {
     const leadingWhitespace = source.match(/^ */)[0].length
     const target = previousLine.text
     const targetTextWidth = stringWidth(target.trimRight())

     if (!previousLine.span) {
       return source
     }

     // if we're not applying wrapping logic,
     // just always append to the span.
     if (!this.wrap) {
       previousLine.hidden = true
       return target + source
     }

     if (leadingWhitespace < targetTextWidth) {
       return source
     }

     previousLine.hidden = true

     return target.trimRight() + ' '.repeat(leadingWhitespace - targetTextWidth) + source.trimLeft()
   }

   _rasterize (row) {
     const rrows = []
     const widths = this._columnWidths(row)
     let wrapped

     // word wrap all columns, and create
     // a data-structure that is easy to rasterize.
     row.forEach((col, c) => {
       // leave room for left and right padding.
       col.width = widths[c]
       if (this.wrap) {
         wrapped = wrap(col.text, this._negatePadding(col), { hard: true }).split('\n')
       } else {
         wrapped = col.text.split('\n')
       }

       if (col.border) {
         wrapped.unshift('.' + '-'.repeat(this._negatePadding(col) + 2) + '.')
         wrapped.push("'" + '-'.repeat(this._negatePadding(col) + 2) + "'")
       }

       // add top and bottom padding.
       if (col.padding) {
         wrapped.unshift(...new Array(col.padding[top] || 0).fill(''))
         wrapped.push(...new Array(col.padding[bottom] || 0).fill(''))
       }

       wrapped.forEach((str, r) => {
         if (!rrows[r]) {
           rrows.push([])
         }

         const rrow = rrows[r]

         for (let i = 0; i < c; i++) {
           if (rrow[i] === undefined) {
             rrow.push('')
           }
         }

         rrow.push(str)
       })
     })

     return rrows
   }

   _negatePadding (col) {
     let wrapWidth = col.width
     if (col.padding) {
       wrapWidth -= (col.padding[left] || 0) + (col.padding[right] || 0)
     }

     if (col.border) {
       wrapWidth -= 4
     }

     return wrapWidth
   }

   _columnWidths (row) {
     if (!this.wrap) {
       return row.map(col => {
         return col.width || stringWidth(col.text)
       })
     }

     let unset = row.length
     let remainingWidth = this.width

     // column widths can be set in config.
     const widths = row.map(col => {
       if (col.width) {
         unset--
         remainingWidth -= col.width
         return col.width
       }

       return undefined
     })

     // any unset widths should be calculated.
     const unsetWidth = unset ? Math.floor(remainingWidth / unset) : 0

     return widths.map((w, i) => {
       if (w === undefined) {
         return Math.max(unsetWidth, _minWidth(row[i]))
       }

       return w
     })
   }
 }

 function addBorder (col, ts, style) {
   if (col.border) {
     if (/[.']-+[.']/.test(ts)) {
       return ''
     }

     if (ts.trim().length !== 0) {
       return style
     }

     return '  '
   }

   return ''
 }

 // calculates the minimum width of
 // a column, based on padding preferences.
 function _minWidth (col) {
   const padding = col.padding || []
   const minWidth = 1 + (padding[left] || 0) + (padding[right] || 0)
   if (col.border) {
     return minWidth + 4
   }

   return minWidth
 }

 function getWindowWidth () {
   /* istanbul ignore next: depends on terminal */
   if (typeof process === 'object' && process.stdout && process.stdout.columns) {
     return process.stdout.columns
   }
 }

 function alignRight (str, width) {
   str = str.trim()
   const strWidth = stringWidth(str)

   if (strWidth < width) {
     return ' '.repeat(width - strWidth) + str
   }

   return str
 }

 function alignCenter (str, width) {
   str = str.trim()
   const strWidth = stringWidth(str)

   /* istanbul ignore next */
   if (strWidth >= width) {
     return str
   }

   return ' '.repeat((width - strWidth) >> 1) + str
 }

 module.exports = function (opts = {}) {
   return new UI({
     width: opts.width || getWindowWidth() || /* istanbul ignore next */ 80,
     wrap: opts.wrap !== false
   })
 }
	'use strict'

	const stringWidth = require('string-width')
	const stripAnsi = require('strip-ansi')
	const wrap = require('wrap-ansi')

	const align = {
	right: alignRight,
	center: alignCenter
	}
	const top = 0
	const right = 1
	const bottom = 2
	const left = 3

	class UI {
	constructor (opts) {
	this.width = opts.width
	this.wrap = opts.wrap
	this.rows = []
	}

	span (...args) {
	const cols = this.div(...args)
	cols.span = true
	}

	resetOutput () {
	this.rows = []
	}

	div (...args) {
	if (args.length === 0) {
	this.div('')
	}

	if (this.wrap && this._shouldApplyLayoutDSL(...args)) {
	return this._applyLayoutDSL(args[0])
	}

	const cols = args.map(arg => {
	if (typeof arg === 'string') {
	return this._colFromString(arg)
	}

	return arg
	})

	this.rows.push(cols)
	return cols
	}

	_shouldApplyLayoutDSL (...args) {
	return args.length === 1 && typeof args[0] === 'string' &&
	/[\t\n]/.test(args[0])
	}

	_applyLayoutDSL (str) {
	const rows = str.split('\n').map(row => row.split('\t'))
	let leftColumnWidth = 0

	// simple heuristic for layout, make sure the
	// second column lines up along the left-hand.
	// don't allow the first column to take up more
	// than 50% of the screen.
	rows.forEach(columns => {
	if (columns.length > 1 && stringWidth(columns[0]) > leftColumnWidth) {
	leftColumnWidth = Math.min(
	Math.floor(this.width * 0.5),
	stringWidth(columns[0])
	)
	}
	})

	// generate a table:
	// replacing ' ' with padding calculations.
	// using the algorithmically generated width.
	rows.forEach(columns => {
	this.div(...columns.map((r, i) => {
	return {
	text: r.trim(),
	padding: this._measurePadding(r),
	width: (i === 0 && columns.length > 1) ? leftColumnWidth : undefined
	}
	}))
	})

	return this.rows[this.rows.length - 1]
	}

	_colFromString (text) {
	return {
	text,
	padding: this._measurePadding(text)
	}
	}

	_measurePadding (str) {
	// measure padding without ansi escape codes
	const noAnsi = stripAnsi(str)
	return [0, noAnsi.match(/\s$/)[0].length, 0, noAnsi.match(/^\s/)[0].length]
	}

	toString () {
	const lines = []

	this.rows.forEach(row => {
	this.rowToString(row, lines)
	})

	// don't display any lines with the
	// hidden flag set.
	return lines
	.filter(line => !line.hidden)
	.map(line => line.text)
	.join('\n')
	}

	rowToString (row, lines) {
	this._rasterize(row).forEach((rrow, r) => {
	let str = ''
	rrow.forEach((col, c) => {
	const { width } = row[c] // the width with padding.
	const wrapWidth = this._negatePadding(row[c]) // the width without padding.

	let ts = col // temporary string used during alignment/padding.

	if (wrapWidth > stringWidth(col)) {
	ts += ' '.repeat(wrapWidth - stringWidth(col))
	}

	// align the string within its column.
	if (row[c].align && row[c].align !== 'left' && this.wrap) {
	ts = align[row[c].align](ts, wrapWidth)
	if (stringWidth(ts) < wrapWidth) {
	ts += ' '.repeat(width - stringWidth(ts) - 1)
	}
	}

	// apply border and padding to string.
	const padding = row[c].padding \|\| [0, 0, 0, 0]
	if (padding[left]) {
	str += ' '.repeat(padding[left])
	}

	str += addBorder(row[c], ts, '\| ')
	str += ts
	str += addBorder(row[c], ts, ' \|')
	if (padding[right]) {
	str += ' '.repeat(padding[right])
	}

	// if prior row is span, try to render the
	// current row on the prior line.
	if (r === 0 && lines.length > 0) {
	str = this._renderInline(str, lines[lines.length - 1])
	}
	})

	// remove trailing whitespace.
	lines.push({
	text: str.replace(/ +$/, ''),
	span: row.span
	})
	})

	return lines
	}

	// if the full 'source' can render in
	// the target line, do so.
	_renderInline (source, previousLine) {
	const leadingWhitespace = source.match(/^ */)[0].length
	const target = previousLine.text
	const targetTextWidth = stringWidth(target.trimRight())

	if (!previousLine.span) {
	return source
	}

	// if we're not applying wrapping logic,
	// just always append to the span.
	if (!this.wrap) {
	previousLine.hidden = true
	return target + source
	}

	if (leadingWhitespace < targetTextWidth) {
	return source
	}

	previousLine.hidden = true

	return target.trimRight() + ' '.repeat(leadingWhitespace - targetTextWidth) + source.trimLeft()
	}

	_rasterize (row) {
	const rrows = []
	const widths = this._columnWidths(row)
	let wrapped

	// word wrap all columns, and create
	// a data-structure that is easy to rasterize.
	row.forEach((col, c) => {
	// leave room for left and right padding.
	col.width = widths[c]
	if (this.wrap) {
	wrapped = wrap(col.text, this._negatePadding(col), { hard: true }).split('\n')
	} else {
	wrapped = col.text.split('\n')
	}

	if (col.border) {
	wrapped.unshift('.' + '-'.repeat(this._negatePadding(col) + 2) + '.')
	wrapped.push("'" + '-'.repeat(this._negatePadding(col) + 2) + "'")
	}

	// add top and bottom padding.
	if (col.padding) {
	wrapped.unshift(...new Array(col.padding[top] \|\| 0).fill(''))
	wrapped.push(...new Array(col.padding[bottom] \|\| 0).fill(''))
	}

	wrapped.forEach((str, r) => {
	if (!rrows[r]) {
	rrows.push([])
	}

	const rrow = rrows[r]

	for (let i = 0; i < c; i++) {
	if (rrow[i] === undefined) {
	rrow.push('')
	}
	}

	rrow.push(str)
	})
	})

	return rrows
	}

	_negatePadding (col) {
	let wrapWidth = col.width
	if (col.padding) {
	wrapWidth -= (col.padding[left] \|\| 0) + (col.padding[right] \|\| 0)
	}

	if (col.border) {
	wrapWidth -= 4
	}

	return wrapWidth
	}

	_columnWidths (row) {
	if (!this.wrap) {
	return row.map(col => {
	return col.width \|\| stringWidth(col.text)
	})
	}

	let unset = row.length
	let remainingWidth = this.width

	// column widths can be set in config.
	const widths = row.map(col => {
	if (col.width) {
	unset--
	remainingWidth -= col.width
	return col.width
	}

	return undefined
	})

	// any unset widths should be calculated.
	const unsetWidth = unset ? Math.floor(remainingWidth / unset) : 0

	return widths.map((w, i) => {
	if (w === undefined) {
	return Math.max(unsetWidth, _minWidth(row[i]))
	}

	return w
	})
	}
	}

	function addBorder (col, ts, style) {
	if (col.border) {
	if (/[.']-+[.']/.test(ts)) {
	return ''
	}

	if (ts.trim().length !== 0) {
	return style
	}

	return ' '
	}

	return ''
	}

	// calculates the minimum width of
	// a column, based on padding preferences.
	function _minWidth (col) {
	const padding = col.padding \|\| []
	const minWidth = 1 + (padding[left] \|\| 0) + (padding[right] \|\| 0)
	if (col.border) {
	return minWidth + 4
	}

	return minWidth
	}

	function getWindowWidth () {
	/* istanbul ignore next: depends on terminal */
	if (typeof process === 'object' && process.stdout && process.stdout.columns) {
	return process.stdout.columns
	}
	}

	function alignRight (str, width) {
	str = str.trim()
	const strWidth = stringWidth(str)

	if (strWidth < width) {
	return ' '.repeat(width - strWidth) + str
	}

	return str
	}

	function alignCenter (str, width) {
	str = str.trim()
	const strWidth = stringWidth(str)

	/* istanbul ignore next */
	if (strWidth >= width) {
	return str
	}

	return ' '.repeat((width - strWidth) >> 1) + str
	}

	module.exports = function (opts = {}) {
	return new UI({
	width: opts.width \|\| getWindowWidth() \|\| /* istanbul ignore next */ 80,
	wrap: opts.wrap !== false
	})
	}