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Add adapter to support reuse of classic JSON-based state shim
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,285 @@ | ||
| using ElmTime.ElmInteractive; | ||
| using ElmTime.ElmSyntax; | ||
| using Pine.Core; | ||
| using Pine.Core.PineVM; | ||
| using Pine.ElmInteractive; | ||
| using Pine.PineVM; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
|
|
||
| namespace ElmTime; | ||
|
|
||
| /// <summary> | ||
| /// Json adapter implements a bridge from the JSON-based interface to Elm backend apps as used from 2018 to 2024. | ||
| /// </summary> | ||
| public class ElmTimeJsonAdapter | ||
| { | ||
| public static IReadOnlyList<string> RootFilePath => | ||
| ["src", "Backend", "InterfaceToHost_Root.elm"]; | ||
|
|
||
| public const string RootModuleName = "Backend.InterfaceToHost_Root"; | ||
|
|
||
| public record Parsed( | ||
| /* | ||
| * jsonEncodeAppState : Backend.Main.State -> Json.Encode.Value | ||
| * */ | ||
| ElmInteractiveEnvironment.FunctionRecord JsonEncodeAppState, | ||
| /* | ||
| * jsonDecodeAppState : Json.Decode.Decoder Backend.Main.State | ||
| * */ | ||
| PineValue JsonDecodeAppState, | ||
| /* | ||
| * The Elm app compiler emits the 'parseMigrationConfig' declaration only if the Elm app has a migration module. | ||
| * */ | ||
| PineValue? JsonDecodeMigratePreviousState, | ||
| /* | ||
| * https://package.elm-lang.org/packages/elm/json/latest/Json-Decode#decodeValue | ||
| * Decoder a -> Value -> Result Error a | ||
| * */ | ||
| ElmInteractiveEnvironment.FunctionRecord JsonDecodeDecodeValue) | ||
| { | ||
| public static Result<string, Parsed> ParseFromCompiled( | ||
| PineValue compiledApp, | ||
| PineVMParseCache parseCache) | ||
| { | ||
| var parseEnvResult = | ||
| ElmInteractiveEnvironment.ParseInteractiveEnvironment(compiledApp); | ||
|
|
||
| { | ||
| if (parseEnvResult.IsErrOrNull() is { } err) | ||
| { | ||
| return err; | ||
| } | ||
| } | ||
|
|
||
| if (parseEnvResult.IsOkOrNull() is not { } parseEnvOk) | ||
| { | ||
| throw new System.Exception( | ||
| "Unexpected null parseEnvResult: " + parseEnvResult); | ||
| } | ||
|
|
||
| var moduleRoot = | ||
| parseEnvOk.Modules | ||
| .FirstOrDefault(module => module.moduleName is RootModuleName); | ||
|
|
||
| if (moduleRoot.moduleValue is null) | ||
| { | ||
| return | ||
| "Root module " + RootModuleName + " not found among " + | ||
| parseEnvOk.Modules.Count + " modules: " + | ||
| string.Join(", ", parseEnvOk.Modules.Select(module => module.moduleName)); | ||
| } | ||
|
|
||
| /* | ||
| jsonDecodeAppState : Json.Decode.Decoder Backend.Main.State | ||
| jsonDecodeAppState = | ||
| Backend.InterfaceToHost_Root.Generated_JsonConverters.jsonDecode_1615808600 | ||
| jsonDecodeMigratePreviousState : Json.Decode.Decoder Backend.MigrateState.PreviousBackendState | ||
| jsonDecodeMigratePreviousState = | ||
| Backend.InterfaceToHost_Root.Generated_JsonConverters.jsonDecode_4168357374 | ||
| jsonEncodeAppState : Backend.Main.State -> Json.Encode.Value | ||
| jsonEncodeAppState = | ||
| Backend.InterfaceToHost_Root.Generated_JsonConverters.jsonEncode_1615808600 | ||
| * */ | ||
|
|
||
| moduleRoot.moduleContent.FunctionDeclarations.TryGetValue( | ||
| "jsonEncodeAppState", | ||
| out var jsonEncodeAppStateValue); | ||
|
|
||
| moduleRoot.moduleContent.FunctionDeclarations.TryGetValue( | ||
| "jsonDecodeAppState", | ||
| out var jsonDecodeAppStateValue); | ||
|
|
||
| moduleRoot.moduleContent.FunctionDeclarations.TryGetValue( | ||
| "jsonDecodeMigratePreviousState", | ||
| out var jsonDecodeMigratePreviousStateValue); | ||
|
|
||
| if (jsonEncodeAppStateValue is null) | ||
| { | ||
| return "Function 'jsonEncodeAppState' not found in root module " + RootModuleName; | ||
| } | ||
|
|
||
| if (jsonDecodeAppStateValue is null) | ||
| { | ||
| return "Function 'jsonDecodeAppState' not found in root module " + RootModuleName; | ||
| } | ||
|
|
||
| var parseJsonEncodeAppStateResult = | ||
| ElmInteractiveEnvironment.ParseFunctionRecordFromValueTagged( | ||
| jsonEncodeAppStateValue, | ||
| parseCache); | ||
|
|
||
| { | ||
| if (parseJsonEncodeAppStateResult.IsErrOrNull() is { } err) | ||
| { | ||
| return | ||
| "Failed to parse 'jsonEncodeAppState' function: " + err; | ||
| } | ||
| } | ||
|
|
||
| if (parseJsonEncodeAppStateResult.IsOkOrNull() is not { } parseJsonEncodeAppStateOk) | ||
| { | ||
| throw new System.Exception( | ||
| "Unexpected parseJsonEncodeAppStateResult: " + parseJsonEncodeAppStateResult); | ||
| } | ||
|
|
||
| var moduleJsonDecode = | ||
| parseEnvOk.Modules | ||
| .FirstOrDefault(module => module.moduleName is "Json.Decode"); | ||
|
|
||
| if (moduleJsonDecode.moduleValue is null) | ||
| { | ||
| return | ||
| "Module 'Json.Decode' not found among " + | ||
| parseEnvOk.Modules.Count + " modules: " + | ||
| string.Join(", ", parseEnvOk.Modules.Select(module => module.moduleName)); | ||
| } | ||
|
|
||
| moduleJsonDecode.moduleContent.FunctionDeclarations.TryGetValue( | ||
| "decodeValue", | ||
| out var decodeValueFunctionValue); | ||
|
|
||
| if (decodeValueFunctionValue is null) | ||
| { | ||
| return "Function 'decodeValue' not found in module 'Json.Decode'"; | ||
| } | ||
|
|
||
| var parseDecodeValueFunctionResult = | ||
| ElmInteractiveEnvironment.ParseFunctionRecordFromValueTagged( | ||
| decodeValueFunctionValue, | ||
| parseCache); | ||
| { | ||
| if (parseDecodeValueFunctionResult.IsErrOrNull() is { } err) | ||
| { | ||
| return | ||
| "Failed to parse 'decodeValue' function: " + err; | ||
| } | ||
| } | ||
|
|
||
| if (parseDecodeValueFunctionResult.IsOkOrNull() is not { } parseDecodeValueFunctionOk) | ||
| { | ||
| throw new System.Exception( | ||
| "Unexpected parseDecodeValueFunctionResult: " + parseDecodeValueFunctionResult); | ||
| } | ||
|
|
||
| return | ||
| new Parsed( | ||
| JsonEncodeAppState: parseJsonEncodeAppStateOk, | ||
| JsonDecodeAppState: jsonDecodeAppStateValue, | ||
| JsonDecodeMigratePreviousState: jsonDecodeMigratePreviousStateValue, | ||
| JsonDecodeDecodeValue: parseDecodeValueFunctionOk); | ||
| } | ||
|
|
||
| public Result<string, PineValue> EncodeAppStateAsJsonValue( | ||
| PineValue appState, | ||
| IPineVM pineVM) | ||
| { | ||
| return ElmInteractiveEnvironment.ApplyFunction(pineVM, JsonEncodeAppState, [appState]); | ||
| } | ||
|
|
||
| public Result<string, PineValue> DecodeAppStateFromJsonValue( | ||
| PineValue jsonValue, | ||
| IPineVM pineVM) | ||
| { | ||
| var jsonDecodeApplyFunctionResult = | ||
| ElmInteractiveEnvironment.ApplyFunction( | ||
| pineVM, | ||
| JsonDecodeDecodeValue, | ||
| [JsonDecodeAppState, jsonValue]); | ||
|
|
||
| { | ||
| if (jsonDecodeApplyFunctionResult.IsErrOrNull() is { } err) | ||
| { | ||
| return err; | ||
| } | ||
| } | ||
|
|
||
| if (jsonDecodeApplyFunctionResult.IsOkOrNull() is not { } jsonDecodeApplyFunctionOk) | ||
| { | ||
| throw new System.Exception( | ||
| "Unexpected jsonDecodeApplyFunctionResult: " + jsonDecodeApplyFunctionResult); | ||
| } | ||
|
|
||
| return | ||
| ElmValueInterop.ParseElmResultValue( | ||
| jsonDecodeApplyFunctionOk, | ||
| err => "Failed to decode JSON value: " + err, | ||
| Result<string, PineValue>.ok, | ||
| invalid: | ||
| err => throw new System.Exception("Invalid: " + err)); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// The original lowering implementation added a 'main' declaration to account for DCE. | ||
| /// </summary> | ||
| public static TreeNodeWithStringPath CleanUpFromLoweredForJavaScript( | ||
| TreeNodeWithStringPath loweredForJavaScript) | ||
| { | ||
| /* | ||
| {-| Support function-level dead code elimination (<https://elm-lang.org/blog/small-assets-without-the-headache>) Elm code needed to inform the Elm compiler about our entry points. | ||
| -} | ||
| main : Program Int () String | ||
| main = | ||
| Platform.worker | ||
| { init = always ( (), Cmd.none ) | ||
| , update = | ||
| { a = interfaceToHost_processEvent | ||
| , b = interfaceToHost_initState | ||
| } | ||
| |> always ( (), Cmd.none ) | ||
| |> always | ||
| |> always | ||
| , subscriptions = always Sub.none | ||
| } | ||
| * */ | ||
|
|
||
| var rootFile = | ||
| loweredForJavaScript.GetNodeAtPath(RootFilePath); | ||
|
|
||
| if (rootFile is not TreeNodeWithStringPath.BlobNode rootFileNode) | ||
| { | ||
| throw new System.Exception("Root file not found at " + string.Join("/", RootFilePath)); | ||
| } | ||
|
|
||
| var rootFileText = | ||
| System.Text.Encoding.UTF8.GetString(rootFileNode.Bytes.Span); | ||
|
|
||
| var inMainDeclaration = false; | ||
|
|
||
| IEnumerable<string> linesFiltered() | ||
| { | ||
| foreach (var line in rootFileText.ModuleLines()) | ||
| { | ||
| if (line.StartsWith("main ")) | ||
| { | ||
| inMainDeclaration = true; | ||
| } | ||
|
|
||
| if (line.Trim().Length is 0) | ||
| { | ||
| inMainDeclaration = false; | ||
| } | ||
|
|
||
| if (!inMainDeclaration) | ||
| { | ||
| yield return line; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var newRootFileText = string.Join("\n", linesFiltered()); | ||
|
|
||
| return | ||
| loweredForJavaScript | ||
| .SetNodeAtPathSorted( | ||
| RootFilePath, | ||
| new TreeNodeWithStringPath.BlobNode( | ||
| System.Text.Encoding.UTF8.GetBytes(newRootFileText))); | ||
| } | ||
| } |
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