Parse Pipeline and TypeCheck Schema and Reference Accessor Functions

readme.md

@@ -1325,27 +1325,26 @@ const B = Value.Encode(Type.String(), 42)             // throw
 
 ### Parse
 
-Use the Parse function to parse a value or throw if invalid. This function internally uses Default, Clean, Convert and Decode to make a best effort attempt to parse the value into the expected type. This function should not be used in performance critical code paths.
+Use the Parse function to process a value. The Parse function will call a specific sequence of Value functions (operations) to process the value.
 
 ```typescript
-const T = Type.Object({ x: Type.Number({ default: 0 }), y: Type.Number({ default: 0 }) })
+const R = Value.Parse(Type.String(), 'hello')      // const R: string = "hello"
 
-// Default
-
-const A = Value.Parse(T, { })                                 // const A = { x: 0, y: 0 }
-
-// Convert
+const E = Value.Parse(Type.String(), undefined)    // throws AssertError 
+```
 
-const B = Value.Parse(T, { x: '1', y: '2' })                  // const B = { x: 1, y: 2 }
+The specific sequence of Value operations is `Clone` `Clean`, `Default`, `Convert`, `Assert` and `Decode`. You can specify user defined sequences in the following way.
 
-// Clean
+```typescript
+// Same as calling the Assert() function
 
-const C = Value.Parse(T, { x: 1, y: 2, z: 3 })                // const C = { x: 1, y: 2 }
+const E = Value.Parse(['Assert'], Type.String(), 12345)
 
-// Assert
+// Same as calling the Convert() then Assert() functions.
 
-const D = Value.Parse(T, undefined)                           // throws AssertError
+const S = Value.Parse(['Convert', 'Assert'], Type.String(), 12345)
 ```
+When specifying user defined sequences, the return type of Parse will be unknown.
 
 <a name='values-equal'></a>
 

src/compiler/compiler.ts

@@ -97,6 +97,14 @@ export class TypeCheck<T extends TSchema> {
   public Code(): string {
     return this.code
   }
+  /** Returns the schema type used to validate */
+  public Schema(): T {
+    return this.schema
+  }
+  /** Returns reference types used to validate */
+  public References(): TSchema[] {
+    return this.references
+  }
   /** Returns an iterator for each error in this value. */
   public Errors(value: unknown): ValueErrorIterator {
     return Errors(this.schema, this.references, value)

src/value/parse/parse.ts

@@ -26,7 +26,8 @@ THE SOFTWARE.
 
 ---------------------------------------------------------------------------*/
 
-import { TransformDecode, HasTransform } from '../transform/index'
+import { TypeBoxError } from '../../type/error/index'
+import { TransformDecode, TransformEncode, HasTransform } from '../transform/index'
 import { TSchema } from '../../type/schema/index'
 import { StaticDecode } from '../../type/static/index'
 import { Assert } from '../assert/assert'
@@ -36,33 +37,92 @@ import { Clean } from '../clean/clean'
 import { Clone } from '../clone/index'
 
 // ------------------------------------------------------------------
-// ParseReducer
+// Guards
 // ------------------------------------------------------------------
-type ReducerFunction = (schema: TSchema, references: TSchema[], value: unknown) => unknown
+import { IsArray, IsUndefined } from '../guard/index'
+
+// ------------------------------------------------------------------
+// Error
+// ------------------------------------------------------------------
+export class ParseError extends TypeBoxError {
+  constructor(message: string) {
+    super(message)
+  }
+}
+
+// ------------------------------------------------------------------
+// ParseRegistry
+// ------------------------------------------------------------------
+export type TParseOperation = 'Clone' | 'Clean' | 'Default' | 'Convert' | 'Assert' | 'Decode' | ({} & string)
+export type TParseFunction = (type: TSchema, references: TSchema[], value: unknown) => unknown
 
 // prettier-ignore
-const ParseReducer: ReducerFunction[] = [
-  (_schema, _references, value) => Clone(value),
-  (schema, references, value) => Default(schema, references, value),
-  (schema, references, value) => Clean(schema, references, value),
-  (schema, references, value) => Convert(schema, references, value),
-  (schema, references, value) => { Assert(schema, references, value); return value },
-  (schema, references, value) => (HasTransform(schema, references) ? TransformDecode(schema, references, value) : value),
-]
+export namespace ParseRegistry {
+  const registry = new Map<string, TParseFunction>([
+    ['Clone', (_type, _references, value: unknown) => Clone(value)],
+    ['Clean', (type, references, value: unknown) => Clean(type, references, value)],
+    ['Default', (type, references, value: unknown) => Default(type, references, value)],
+    ['Convert', (type, references, value: unknown) => Convert(type, references, value)],
+    ['Assert', (type, references, value: unknown) => { Assert(type, references, value); return value }],
+    ['Decode', (type, references, value: unknown) => (HasTransform(type, references) ? TransformDecode(type, references, value) : value)],
+    ['Encode', (type, references, value: unknown) => (HasTransform(type, references) ? TransformEncode(type, references, value) : value)],
+  ])
+  // Deletes an entry from the registry
+  export function Delete(key: string): void {
+    registry.delete(key)
+  }
+  // Sets an entry in the registry
+  export function Set(key: string, callback: TParseFunction): void {
+    registry.set(key, callback)
+  }
+  // Gets an entry in the registry
+  export function Get(key: string): TParseFunction | undefined {
+    return registry.get(key)
+  }
+}
+// ------------------------------------------------------------------
+// ParseDefault: Default Sequence
+// ------------------------------------------------------------------
+// prettier-ignore
+export const ParseDefault = [
+  'Clone',
+  'Clean',
+  'Default',
+  'Convert',
+  'Assert',
+  'Decode'
+] as const
+
 // ------------------------------------------------------------------
 // ParseValue
 // ------------------------------------------------------------------
-function ParseValue<T extends TSchema, R = StaticDecode<T>>(schema: T, references: TSchema[], value: unknown): R {
-  return ParseReducer.reduce((value, reducer) => reducer(schema, references, value), value) as R
+function ParseValue<Type extends TSchema, Result extends StaticDecode<Type> = StaticDecode<Type>>(keys: TParseOperation[], type: Type, references: TSchema[], value: unknown): Result {
+  return keys.reduce((value, key) => {
+    const operation = ParseRegistry.Get(key)
+    if (IsUndefined(operation)) throw new ParseError(`Unable to find Parse operation '${key}'`)
+    return operation(type, references, value)
+  }, value) as Result
 }
+
 // ------------------------------------------------------------------
 // Parse
 // ------------------------------------------------------------------
-/** Parses a value or throws an `AssertError` if invalid. */
-export function Parse<T extends TSchema, R = StaticDecode<T>>(schema: T, references: TSchema[], value: unknown): R
-/** Parses a value or throws an `AssertError` if invalid. */
-export function Parse<T extends TSchema, R = StaticDecode<T>>(schema: T, value: unknown): R
-/** Parses a value or throws an `AssertError` if invalid. */
+/** Parses a value using the default parse pipeline. Will throws an `AssertError` if invalid. */
+export function Parse<Type extends TSchema, Output = StaticDecode<Type>, Result extends Output = Output>(schema: Type, references: TSchema[], value: unknown): Result
+/** Parses a value using the default parse pipeline. Will throws an `AssertError` if invalid. */
+export function Parse<Type extends TSchema, Output = StaticDecode<Type>, Result extends Output = Output>(schema: Type, value: unknown): Result
+/** Parses a value using the specified operations. */
+export function Parse<Type extends TSchema>(operations: TParseOperation[], schema: Type, references: TSchema[], value: unknown): unknown
+/** Parses a value using the specified operations. */
+export function Parse<Type extends TSchema>(operations: TParseOperation[], schema: Type, value: unknown): unknown
+/** Parses a value */
 export function Parse(...args: any[]): unknown {
-  return args.length === 3 ? ParseValue(args[0], args[1], args[2]) : ParseValue(args[0], [], args[1])
+  // prettier-ignore
+  const [reducers, schema, references, value] = (
+    args.length === 4 ? [args[0], args[1], args[2], args[3]] :
+    args.length === 3 ? IsArray(args[0]) ? [args[0], args[1], [], args[2]] : [ParseDefault, args[0], args[1], args[2]] :
+    args.length === 2 ? [ParseDefault, args[0], [], args[1]] :
+    (() => { throw new ParseError('Invalid Arguments') })()
+  )
+  return ParseValue(reducers, schema, references, value)
 }

test/runtime/compiler/__members.ts

@@ -0,0 +1,20 @@
+import { TypeCompiler } from '@sinclair/typebox/compiler'
+import { Type, TypeGuard, ValueGuard } from '@sinclair/typebox'
+import { Assert } from '../assert/index'
+
+describe('compiler/TypeCheckMembers', () => {
+  it('Should return Schema', () => {
+    const A = TypeCompiler.Compile(Type.Number(), [Type.String(), Type.Boolean()])
+    Assert.IsTrue(TypeGuard.IsNumber(A.Schema()))
+  })
+  it('Should return References', () => {
+    const A = TypeCompiler.Compile(Type.Number(), [Type.String(), Type.Boolean()])
+    Assert.IsTrue(TypeGuard.IsNumber(A.Schema()))
+    Assert.IsTrue(TypeGuard.IsString(A.References()[0]))
+    Assert.IsTrue(TypeGuard.IsBoolean(A.References()[1]))
+  })
+  it('Should return Code', () => {
+    const A = TypeCompiler.Compile(Type.Number(), [Type.String(), Type.Boolean()])
+    Assert.IsTrue(ValueGuard.IsString(A.Code()))
+  })
+})

test/runtime/compiler/index.ts

@@ -1,3 +1,4 @@
+import './__members'
 import './any'
 import './array'
 import './async-iterator'

test/runtime/value/parse/parse.ts

@@ -1,5 +1,5 @@
-import { Value, AssertError } from '@sinclair/typebox/value'
-import { Type } from '@sinclair/typebox'
+import { Value, AssertError, ParseRegistry } from '@sinclair/typebox/value'
+import { Type, TypeGuard } from '@sinclair/typebox'
 import { Assert } from '../../assert/index'
 
 // prettier-ignore
@@ -87,4 +87,39 @@ describe('value/Parse', () => {
     const X = Value.Parse(T, 'world')
     Assert.IsEqual(X, 'hello')
   })
+  // ----------------------------------------------------------------
+  // Operations
+  // ----------------------------------------------------------------
+  it('Should run operations 1', () => {
+    const A = Type.Object({ x: Type.Number() })
+    const I = { x: 1 }
+    const O = Value.Parse([], A, I)
+    Assert.IsTrue(I === O)
+  })
+  it('Should run operations 2', () => {
+    const A = Type.Object({ x: Type.Number() })
+    const I = { x: 1 }
+    const O = Value.Parse(['Clone'], A, I)
+    Assert.IsTrue(I !== O)
+  })
+  it('Should run operations 3', () => {
+    ParseRegistry.Set('Intercept', ( schema, references, value) => { throw 1 })
+    const A = Type.Object({ x: Type.Number() })
+    Assert.Throws(() => Value.Parse(['Intercept'], A, null))
+    ParseRegistry.Delete('Intercept')
+    const F = ParseRegistry.Get('Intercept')
+    Assert.IsEqual(F, undefined)
+  })
+  it('Should run operations 4', () => {
+    ParseRegistry.Set('Intercept', ( schema, references, value) => { 
+      Assert.IsEqual(value, 12345)
+      Assert.IsTrue(TypeGuard.IsNumber(schema))
+      Assert.IsTrue(TypeGuard.IsString(references[0]))
+    })
+    Value.Parse(['Intercept'], Type.Number(), [Type.String()], 12345)
+    ParseRegistry.Delete('Intercept')
+  })
+  it('Should run operations 5', () => {
+    Assert.Throws(() => Value.Parse(['Intercept'], Type.String(), null))
+  })
 })