Add examples

Include examples from Landon Curt Noll's website.

src/Converter.ts

@@ -2,14 +2,14 @@ import ConverterStream from './ConverterStream'
 import { ReadStreamOptions, ConvertOptions, NumberSystem, Digit } from './common'
 
 export default class Converter {
-  constructor(private readonly system: NumberSystem) {}
+  constructor(private readonly system: NumberSystem, private options: ConvertOptions) {}
 
-  public convert = (value: string | number | bigint, options: ConvertOptions): string => {
+  public convert = (value: string | number | bigint): string => {
     let converted: string[] = []
     switch (typeof value!) {
       case 'string':
       case 'number':
-        return this.convert(BigInt(value), options)
+        return this.convert(BigInt(value))
       case 'bigint':
         let current = value as bigint
         let thousandPower = 0n
@@ -22,7 +22,7 @@ export default class Converter {
           let kiloCount: string
           if (!(ones === 0 && tens === 0 && hundreds === 0)) {
             if (thousandPower > 0n) {
-              const { scale = 'short' } = options
+              const { scale = 'short' } = this.options
               kiloName = this.system.getKiloName[scale!]!(thousandPower)
             }
             kiloCount = this.system.getKiloCount(hundreds, tens, ones)
@@ -39,8 +39,7 @@ export default class Converter {
     throw TypeError('Invalid argument passed to value.')
   }
 
-  readStream(options: ReadStreamOptions): ConverterStream {
-    const { scale = 'short', encoding = 'utf-8' } = options
-    return new ConverterStream(this.system, { scale, encoding })
+  public readStream = (streamOptions: ReadStreamOptions): ConverterStream => {
+    return new ConverterStream(this.convert, streamOptions)
   }
 }

src/ConverterStream.ts

@@ -1,47 +1,26 @@
 import { Transform } from 'stream'
-import { Digit, NumberSystem, ReadStreamOptions } from './common'
+import { StreamOptions } from './common'
 
 export default class ConverterStream extends Transform {
-  private thousandPower: bigint = 0n
+  private bigintBuffer: bigint = 0n
 
-  private buffer = Buffer.from([])
-
-  constructor(private readonly system: NumberSystem, private readonly options: ReadStreamOptions) {
+  constructor(
+    private readonly converter: (value: string | number | bigint) => string,
+    readonly options: StreamOptions,
+  ) {
     super()
-    this.thousandPower = 0n
   }
 
   _transform(chunk: Buffer, _encoding: BufferEncoding, callback: Function) {
-    const { scale, encoding } = this.options
-
-    const [ones = 0, tens = 0, hundreds = 0] = chunk
-      .toString(encoding!)
-      .split('')
-      .filter((s: string) => /[0-9]/.test(s))
-      .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 > 0n) {
-        kiloName = this.system.getKiloName[scale!]!(this.thousandPower)
-      }
-      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
+    let chunkStr = chunk.toString(this.options.encoding)
+    // we might run out of allocation for bigints?
+    this.bigintBuffer *= 10n ** BigInt(chunkStr.length)
+    this.bigintBuffer += BigInt(chunkStr)
     callback()
   }
 
   _flush(callback: Function) {
-    const { encoding } = this.options
-    this.push(this.buffer, encoding)
+    this.push(this.converter(this.bigintBuffer), this.options.encoding)
     callback()
   }
 }

tests/Converter.test.ts

@@ -10,7 +10,7 @@ describe.each`
   let converter: Converter
 
   beforeAll(() => {
-    converter = new Converter(system)
+    converter = new Converter(system, { scale, })
   })
 
   describe('on values', () => {
@@ -19,7 +19,7 @@ describe.each`
     ${1000000}   | ${'one million'}
     ${123456789} | ${'one hundred twenty three million four hundred fifty six thousand seven hundred eighty nine'}
   `('should parse $value as $name', ({ value, name, }) => {
-      expect(converter.convert(value, { scale })).toBe(name)
+      expect(converter.convert(value)).toBe(name)
     })
   })
 
@@ -27,22 +27,26 @@ describe.each`
     const ENCODING = 'utf-8'
 
     test.each([
-      'million.txt'
+      'million',
+      'example1',
+      'example2',
+      'example3',
+      'example4',
+      'example5',
+      'example6',
     ])('should correctly parse a stream', async (filename) => {
       const inputStream = fs.createReadStream(
-        `./tests/input/${filename}`,
+        `./tests/input/${filename}.txt`,
         {
           encoding: ENCODING,
-          highWaterMark: 3, // this is required to parse kilos correctly
         }
       )
       const readStream = converter.readStream({
-        scale,
         encoding: ENCODING
       })
       inputStream
         .pipe(readStream)
-        .pipe(fs.createWriteStream(`./tests/output/${filename}`))
+        .pipe(fs.createWriteStream(`./tests/output/${filename}.${scale}.txt`))
 
       return new Promise((resolve) => {
         readStream.on('end', () => {

tests/input/example1.txt

@@ -0,0 +1 @@
+987654321

tests/input/example2.txt

@@ -0,0 +1 @@
+123456789246801357

tests/input/example3.txt

@@ -0,0 +1 @@
+123456789246801357000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

tests/input/example4.txt

@@ -0,0 +1 @@
+123456789246801357000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

tests/input/example5.txt

@@ -0,0 +1 @@
+123456789246801357000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

tests/input/example6.txt

@@ -0,0 +1 @@
+123456789246801357000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

tests/input/million.txt

@@ -1 +1 @@
-987000321
+1000000