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index.js
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Wed, Jul 16, 11:22

index.js
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const os = require('os')
/**
* @module table-layout
*/
/**
* Recordset data in (array of objects), text table out.
* @alias module:table-layout
* @example
* > Table = require('table-layout')
* > jsonData = [{
* col1: 'Some text you wish to read in table layout',
* col2: 'And some more text in column two. '
* }]
* > table = new Table(jsonData, { maxWidth: 30 })
* > console.log(table.toString())
* Some text you And some more
* wish to read text in
* in table column two.
* layout
*/
class Table {
/**
* @param {object[]} - input data
* @param [options] {object} - optional settings
* @param [options.maxWidth] {number} - maximum width of layout
* @param [options.noWrap] {boolean} - disable wrapping on all columns
* @param [options.noTrim] {boolean} - disable line-trimming
* @param [options.break] {boolean} - enable word-breaking on all columns
* @param [options.columns] {module:table-layout~columnOption} - array of column-specific options
* @param [options.ignoreEmptyColumns] {boolean} - if set, empty columns or columns containing only whitespace are not rendered.
* @param [options.padding] {object} - Padding values to set on each column. Per-column overrides can be set in the `options.columns` array.
* @param [options.padding.left] {string} - Defaults to a single space.
* @param [options.padding.right] {string} - Defaults to a single space.
* @alias module:table-layout
*/
constructor (data, options) {
let ttyWidth = (process && (process.stdout.columns || process.stderr.columns)) || 0
/* Windows quirk workaround */
if (ttyWidth && os.platform() === 'win32') ttyWidth--
let defaults = {
padding: {
left: ' ',
right: ' '
},
maxWidth: ttyWidth || 80,
columns: []
}
const extend = require('deep-extend')
this.options = extend(defaults, options)
this.load(data)
}
load (data) {
const Rows = require('./lib/rows')
const Columns = require('./lib/columns')
let options = this.options
/* remove empty columns */
if (options.ignoreEmptyColumns) {
data = Rows.removeEmptyColumns(data)
}
this.columns = Columns.getColumns(data)
this.rows = new Rows(data, this.columns)
/* load default column properties from options */
this.columns.maxWidth = options.maxWidth
this.columns.list.forEach(column => {
if (options.padding) column.padding = options.padding
if (options.noWrap) column.noWrap = options.noWrap
if (options.break) {
column.break = options.break
column.contentWrappable = true
}
})
/* load column properties from options.columns */
options.columns.forEach(optionColumn => {
let column = this.columns.get(optionColumn.name)
if (column) {
if (optionColumn.padding) {
column.padding.left = optionColumn.padding.left
column.padding.right = optionColumn.padding.right
}
if (optionColumn.width) column.width = optionColumn.width
if (optionColumn.maxWidth) column.maxWidth = optionColumn.maxWidth
if (optionColumn.minWidth) column.minWidth = optionColumn.minWidth
if (optionColumn.noWrap) column.noWrap = optionColumn.noWrap
if (optionColumn.break) {
column.break = optionColumn.break
column.contentWrappable = true
}
}
})
this.columns.autoSize()
return this
}
getWrapped () {
const wrap = require('wordwrapjs')
this.columns.autoSize()
return this.rows.list.map(row => {
let line = []
row.forEach((cell, column) => {
if (column.noWrap) {
line.push(cell.value.split(/\r\n?|\n/))
} else {
line.push(wrap.lines(cell.value, {
width: column.wrappedContentWidth,
break: column.break,
noTrim: this.options.noTrim
}))
}
})
return line
})
}
getLines () {
var wrappedLines = this.getWrapped()
var lines = []
wrappedLines.forEach(wrapped => {
let mostLines = getLongestArray(wrapped)
for (let i = 0; i < mostLines; i++) {
let line = []
wrapped.forEach(cell => {
line.push(cell[i] || '')
})
lines.push(line)
}
})
return lines
}
/**
* Identical to `.toString()` with the exception that the result will be an array of lines, rather than a single, multi-line string.
* @returns {string[]}
*/
renderLines () {
var lines = this.getLines()
return lines.map(line => {
return line.reduce((prev, cell, index) => {
let column = this.columns.list[index]
return prev + padCell(cell, column.padding, column.generatedWidth)
}, '')
})
}
/**
* Returns the input data as a text table.
* @returns {string}
*/
toString () {
return this.renderLines().join(os.EOL) + os.EOL
}
}
/**
* Array of arrays in.. Returns the length of the longest one
* @returns {number}
* @private
*/
function getLongestArray (arrays) {
var lengths = arrays.map(array => array.length)
return Math.max.apply(null, lengths)
}
function padCell (cellValue, padding, width) {
const ansi = require('./lib/ansi')
var ansiLength = cellValue.length - ansi.remove(cellValue).length
cellValue = cellValue || ''
return (padding.left || '') +
cellValue.padEnd(width - padding.length() + ansiLength) + (padding.right || '')
}
/**
* @typedef module:table-layout~columnOption
* @property name {string} - column name, must match a property name in the input
* @property [width] {number} - A specific column width. Supply either this or a min and/or max width.
* @property [minWidth] {number} - column min width
* @property [maxWidth] {number} - column max width
* @property [nowrap] {boolean} - disable wrapping for this column
* @property [break] {boolean} - enable word-breaking for this columns
* @property [padding] {object} - padding options
* @property [padding.left] {string} - a string to pad the left of each cell (default: `' '`)
* @property [padding.right] {string} - a string to pad the right of each cell (default: `' '`)
*/
module.exports = Table

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