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Implement converter internal buffer

Use internal buffer for storing conversions. These conversions happen on reading of chunks, and the buffer is needed so the stream can be read forwards.
master
TheoryOfNekomata 4 years ago
parent
commit
64f6f622bf
1 changed files with 20 additions and 17 deletions
  1. +20
    -17
      src/ConverterStream.ts

+ 20
- 17
src/ConverterStream.ts View File

@@ -4,6 +4,8 @@ import { Digit, NumberSystem, ReadStreamOptions } from './common'
export default class ConverterStream extends Transform {
private thousandPower: bigint = 0n

private buffer = Buffer.from([])

constructor(private readonly system: NumberSystem, private readonly options: ReadStreamOptions) {
super()
this.thousandPower = 0n
@@ -16,29 +18,30 @@ export default class ConverterStream extends Transform {
.toString(encoding!)
.split('')
.filter((s: string) => /[0-9]/.test(s))
.map((d: string) => Number(d)) // todo use encoding
.map((d: string) => Number(d) as Digit) // todo use encoding

let kiloName: string | undefined
let kiloCount: string

if (!(ones === 0 && tens === 0 && hundreds === 0)) {
if (this.thousandPower > 0) {
this.push(
this.system.getKiloName[scale!]!(this.thousandPower)
.split('')
.reverse()
.join(''),
)
this.push(' ')
if (this.thousandPower > 0n) {
kiloName = this.system.getKiloName[scale!]!(this.thousandPower)
}
this.push(
this.system
.getKiloCount(hundreds as Digit, tens as Digit, ones as Digit)
.split('')
.reverse()
.join(''),
)
this.push(' ')
kiloCount = this.system.getKiloCount(hundreds, tens, ones)
this.buffer = Buffer.concat([
Buffer.from(this.system.joinKilo(kiloCount, kiloName), encoding),
Buffer.from(' ', encoding),
this.buffer,
])
}

this.thousandPower = this.thousandPower + 1n
callback()
}

_flush(callback: Function) {
const { encoding } = this.options
this.push(this.buffer, encoding)
callback()
}
}