54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
'use strict'
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const arrayify = require('array-back')
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const Cell = require('./cell')
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const t = require('typical')
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/**
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*
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*/
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class Rows {
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constructor (rows, columns) {
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this.list = []
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this.load(rows, columns)
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}
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load (rows, columns) {
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arrayify(rows).forEach(row => {
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this.list.push(new Map(objectToIterable(row, columns)))
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})
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}
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static removeEmptyColumns (data) {
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const distinctColumnNames = data.reduce((columnNames, row) => {
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Object.keys(row).forEach(key => {
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if (columnNames.indexOf(key) === -1) columnNames.push(key)
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})
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return columnNames
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}, [])
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const emptyColumns = distinctColumnNames.filter(columnName => {
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const hasValue = data.some(row => {
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const value = row[columnName]
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return (t.isDefined(value) && !t.isString(value)) || (t.isString(value) && /\S+/.test(value))
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})
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return !hasValue
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})
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return data.map(row => {
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emptyColumns.forEach(emptyCol => delete row[emptyCol])
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return row
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})
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}
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}
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function objectToIterable (row, columns) {
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return columns.list.map(column => {
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return [ column, new Cell(row[column.name], column) ]
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})
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}
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/**
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* @module rows
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*/
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module.exports = Rows
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