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const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
module.exports = CurrencyInput
inherits(CurrencyInput, Component)
function CurrencyInput (props) {
Component.call(this)
this.state = {
value: sanitizeValue(props.value),
}
}
function removeNonDigits (str) {
return str.match(/\d|$/g).join('')
}
// Removes characters that are not digits, then removes leading zeros
function sanitizeInteger (val) {
return String(parseInt(removeNonDigits(val) || '0', 10))
}
function sanitizeDecimal (val) {
return removeNonDigits(val)
}
// Take a single string param and returns a non-negative integer or float as a string.
// Breaks the input into three parts: the integer, the decimal point, and the decimal/fractional part.
// Removes leading zeros from the integer, and non-digits from the integer and decimal
// The integer is returned as '0' in cases where it would be empty. A decimal point is
// included in the returned string if one is included in the param
// Examples:
// sanitizeValue('0') -> '0'
// sanitizeValue('a') -> '0'
// sanitizeValue('010.') -> '10.'
// sanitizeValue('0.005') -> '0.005'
// sanitizeValue('22.200') -> '22.200'
// sanitizeValue('.200') -> '0.200'
// sanitizeValue('a.b.1.c,89.123') -> '0.189123'
function sanitizeValue (value) {
let [ , integer, point, decimal] = (/([^.]*)([.]?)([^.]*)/).exec(value)
integer = sanitizeInteger(integer) || '0'
decimal = sanitizeDecimal(decimal)
return `${integer}${point}${decimal}`
}
CurrencyInput.prototype.handleChange = function (newValue) {
const { onInputChange } = this.props
const { value } = this.state
let parsedValue = newValue
const newValueLastIndex = newValue.length - 1
if (value === '0' && newValue[newValueLastIndex] === '0') {
parsedValue = parsedValue.slice(0, newValueLastIndex)
}
const sanitizedValue = sanitizeValue(parsedValue)
this.setState({ value: sanitizedValue })
onInputChange(sanitizedValue)
}
// If state.value === props.value plus a decimal point, or at least one
// zero or a decimal point and at least one zero, then this returns state.value
// after it is sanitized with getValueParts
CurrencyInput.prototype.getValueToRender = function () {
const { value } = this.props
const { value: stateValue } = this.state
const trailingStateString = (new RegExp(`^${value}(.+)`)).exec(stateValue)
const trailingDecimalAndZeroes = trailingStateString && (/^[.0]0*/).test(trailingStateString[1])
return sanitizeValue(trailingDecimalAndZeroes
? stateValue
: value)
}
CurrencyInput.prototype.render = function () {
const {
className,
placeholder,
readOnly,
inputRef,
} = this.props
const inputSizeMultiplier = readOnly ? 1 : 1.2
const valueToRender = this.getValueToRender()
return h('input', {
className,
value: valueToRender,
placeholder,
size: valueToRender.length * inputSizeMultiplier,
readOnly,
onChange: e => this.handleChange(e.target.value),
ref: inputRef,
})
}
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