Merge branch 'develop' into reducer-project
This commit is contained in:
commit
58e1cf187d
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@ -1,4 +0,0 @@
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open Jest
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open Expect
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test("todo", () => expect("1")->toBe("1"))
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@ -69,3 +69,5 @@ myTypeCheckTest(test, "number | string", "1", "Ok")
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myTypeCheckTest(test, "date | string", "1", "Expected type: (date | string) but got: 1")
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myTypeCheckTest(test, "number<-min(10)", "10", "Ok")
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myTypeCheckTest(test, "number<-min(10)", "0", "Expected type: number<-min(10) but got: 0")
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myTypeCheckTest(test, "any", "0", "Ok")
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myTypeCheckTest(test, "any", "'a'", "Ok")
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@ -0,0 +1,123 @@
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open Jest
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open Expect
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module DispatchT = Reducer_Dispatch_T
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module Expression = Reducer_Expression
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module ExpressionT = Reducer_Expression_T
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module TypeCompile = Reducer_Type_Compile
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module TypeChecker = Reducer_Type_TypeChecker
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open ReducerInterface_InternalExpressionValue
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type errorValue = Reducer_ErrorValue.errorValue
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// Let's build a function to replace switch statements
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// In dispatchChainPiece, we execute an return the result of execution if there is a type match.
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// Otherwise we return None so that the call chain can continue.
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// So we want to build a function like
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// dispatchChainPiece = (call: functionCall, environment): option<result<internalExpressionValue, errorValue>>
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// Now lets make the dispatchChainPiece itself.
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// Note that I am not passing the reducer to the dispatchChainPiece as an argument because it is in the context anyway.
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// Keep in mind that reducerFn is necessary for map/reduce so dispatchChainPiece should have a reducerFn in context.
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let makeMyDispatchChainPiece = (reducer: ExpressionT.reducerFn): DispatchT.dispatchChainPiece => {
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// Let's have a pure implementations
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module Implementation = {
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let stringConcat = (a: string, b: string): string => Js.String2.concat(a, b)
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let arrayConcat = (
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a: Js.Array2.t<internalExpressionValue>,
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b: Js.Array2.t<internalExpressionValue>,
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): Js.Array2.t<internalExpressionValue> => Js.Array2.concat(a, b)
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let plot = _r => "yey, plotted"
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}
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let extractStringString = args =>
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switch args {
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| [IEvString(a), IEvString(b)] => (a, b)
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| _ => raise(Reducer_Exception.ImpossibleException("extractStringString developer error"))
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}
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let extractArrayArray = args =>
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switch args {
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| [IEvArray(a), IEvArray(b)] => (a, b)
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| _ => raise(Reducer_Exception.ImpossibleException("extractArrayArray developer error"))
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}
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// Let's bridge the pure implementation to expression values
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module Bridge = {
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let stringConcat: DispatchT.genericIEvFunction = (args, _environment) => {
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let (a, b) = extractStringString(args)
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Implementation.stringConcat(a, b)->IEvString->Ok
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}
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let arrayConcat: DispatchT.genericIEvFunction = (args, _environment) => {
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let (a, b) = extractArrayArray(args)
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Implementation.arrayConcat(a, b)->IEvArray->Ok
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}
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let plot: DispatchT.genericIEvFunction = (args, _environment) => {
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switch args {
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// Just assume that we are doing the business of extracting and converting the deep record
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| [IEvRecord(_)] => Implementation.plot({"title": "This is a plot"})->IEvString->Ok
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| _ => raise(Reducer_Exception.ImpossibleException("plot developer error"))
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}
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}
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}
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// concat functions are to illustrate polymoprhism. And the plot function is to illustrate complex types
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let jumpTable = [
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(
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"concat",
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TypeCompile.fromTypeExpressionExn("string=>string=>string", reducer),
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Bridge.stringConcat,
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),
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(
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"concat",
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TypeCompile.fromTypeExpressionExn("[any]=>[any]=>[any]", reducer),
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Bridge.arrayConcat,
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),
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(
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"plot",
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TypeCompile.fromTypeExpressionExn(
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// Nested complex types are available
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// records {property: type}
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// arrays [type]
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// tuples [type, type]
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// <- type contracts are available naturally and they become part of dispatching
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// Here we are not enumerating the possibilities because type checking has a dedicated test
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"{title: string, line: {width: number, color: string}}=>string",
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reducer,
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),
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Bridge.plot,
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),
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]
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//Here we are creating a dispatchChainPiece function that will do the actual dispatch from the jumpTable
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Reducer_Dispatch_ChainPiece.makeFromTypes(jumpTable)
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}
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// And finally, let's write a library dispatch for our external library
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// Exactly the same as the one used in real life
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let _dispatch = (
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call: functionCall,
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environment,
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reducer: Reducer_Expression_T.reducerFn,
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chain,
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): result<internalExpressionValue, 'e> => {
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let dispatchChainPiece = makeMyDispatchChainPiece(reducer)
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dispatchChainPiece(call, environment)->E.O2.defaultFn(() => chain(call, environment, reducer))
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}
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// What is important about this implementation?
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// A) Exactly the same function jump table can be used to create type guarded lambda functions
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// Guarded lambda functions will be the basis of the next version of Squiggle
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// B) Complicated recursive record types are not a problem.
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describe("Type Dispatch", () => {
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let reducerFn = Expression.reduceExpression
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let dispatchChainPiece = makeMyDispatchChainPiece(reducerFn)
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test("stringConcat", () => {
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let call: functionCall = ("concat", [IEvString("hello"), IEvString("world")])
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let result = dispatchChainPiece(call, defaultEnvironment)
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expect(result)->toEqual(Some(Ok(IEvString("helloworld"))))
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})
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})
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@ -0,0 +1,19 @@
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module TypeChecker = Reducer_Type_TypeChecker
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module T = Reducer_Dispatch_T
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open ReducerInterface_InternalExpressionValue
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type errorValue = Reducer_ErrorValue.errorValue
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let makeFromTypes = jumpTable => {
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let dispatchChainPiece: T.dispatchChainPiece = ((fnName, fnArgs): functionCall, environment) => {
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let jumpTableEntry = jumpTable->Js.Array2.find(elem => {
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let (candidName, candidType, _) = elem
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candidName == fnName && TypeChecker.checkITypeArgumentsBool(candidType, fnArgs)
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})
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switch jumpTableEntry {
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| Some((_, _, bridgeFn)) => bridgeFn(fnArgs, environment)->Some
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| _ => None
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}
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}
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dispatchChainPiece
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}
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@ -0,0 +1,20 @@
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module InternalExpressionValue = ReducerInterface_InternalExpressionValue
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module ExpressionT = Reducer_Expression_T
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// Each piece of the dispatch chain computes the result or returns None so that the chain can continue
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type dispatchChainPiece = (
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InternalExpressionValue.functionCall,
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InternalExpressionValue.environment,
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) => option<result<InternalExpressionValue.t, Reducer_ErrorValue.errorValue>>
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type dispatchChainPieceWithReducer = (
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InternalExpressionValue.functionCall,
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InternalExpressionValue.environment,
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ExpressionT.reducerFn,
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) => option<result<InternalExpressionValue.t, Reducer_ErrorValue.errorValue>>
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// This is a switch statement case implementation: get the arguments and compute the result
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type genericIEvFunction = (
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array<InternalExpressionValue.t>,
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InternalExpressionValue.environment,
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) => result<InternalExpressionValue.t, Reducer_ErrorValue.errorValue>
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@ -35,3 +35,12 @@ let fromTypeExpression = (typeExpressionSourceCode: string, reducerFn: ProjectRe
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> => {
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ievFromTypeExpression(typeExpressionSourceCode, reducerFn)->Belt.Result.map(T.fromIEvValue)
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}
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let fromTypeExpressionExn = (
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typeExpressionSourceCode: string,
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reducerFn: ExpressionT.reducerFn,
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): T.t =>
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switch fromTypeExpression(typeExpressionSourceCode, reducerFn) {
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| Ok(value) => value
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| _ => `Cannot compile ${typeExpressionSourceCode}`->Reducer_Exception.ImpossibleException->raise
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}
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@ -9,12 +9,17 @@ open InternalExpressionValue
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let rec isITypeOf = (anIType: T.iType, aValue): result<bool, T.typeErrorValue> => {
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let caseTypeIdentifier = (anUpperTypeName, aValue) => {
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let aTypeName = anUpperTypeName->Js.String2.toLowerCase
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switch aTypeName {
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| "any" => Ok(true)
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| _ => {
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let valueTypeName = aValue->valueToValueType->valueTypeToString->Js.String2.toLowerCase
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switch aTypeName == valueTypeName {
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| true => Ok(true)
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| false => T.TypeMismatch(anIType, aValue)->Error
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}
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}
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}
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}
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let caseRecord = (anIType, propertyMap: Belt.Map.String.t<T.iType>, evValue) =>
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switch evValue {
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}
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}
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let checkITypeArgumentsBool = (anIType: T.iType, args: array<InternalExpressionValue.t>): bool => {
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switch checkITypeArguments(anIType, args) {
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| Ok(_) => true
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| _ => false
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}
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}
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let checkArguments = (
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typeExpressionSourceCode: string,
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args: array<InternalExpressionValue.t>,
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