Implement simplified RegisteredFunction.Invoke that uses JSON for marshalling
This commit is contained in:
Steve Sanderson
parent
54c2431e88
commit
78d12da33e
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@ -1,4 +1,7 @@
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const registeredFunctions = {};
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import { System_String } from './Platform/Platform';
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import { platform } from './Environment';
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const registeredFunctions: { [identifier: string]: Function } = {};
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// Code in Mono 'driver.c' looks for the registered functions here
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window['__blazorRegisteredFunctions'] = registeredFunctions;
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@ -10,3 +13,16 @@ export function registerFunction(identifier: string, implementation: Function) {
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registeredFunctions[identifier] = implementation;
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}
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// Handle the JSON-marshalled RegisteredFunction.Invoke calls
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registerFunction('__blazor_InvokeJson', (identifier: System_String, ...argsJson: System_String[]) => {
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const identifierJsString = platform.toJavaScriptString(identifier);
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if (!(registeredFunctions && registeredFunctions.hasOwnProperty(identifierJsString))) {
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throw new Error(`Could not find registered function with name "${identifier}".`);
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}
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const funcInstance = registeredFunctions[identifierJsString];
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const args = argsJson.map(json => JSON.parse(platform.toJavaScriptString(json)));
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const result = funcInstance.apply(null, args);
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const resultJson = JSON.stringify(result);
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return platform.toDotNetString(resultJson);
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});
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@ -0,0 +1,138 @@
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// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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namespace Microsoft.Blazor.Browser.Interop
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{
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/// <summary>
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/// Temporary internal JSON serialization library.
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/// This will be removed when public JSON methods are added to Microsoft.Blazor
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/// (which will be needed for HTTP support at least).
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/// </summary>
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internal static class Json
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{
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public static string Serialize(object value)
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{
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return MiniJSON.Json.Serialize(value);
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}
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public static T Deserialize<T>(string json)
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{
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var deserialized = MiniJSON.Json.Deserialize(json);
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return (T)CoerceShallow(deserialized, typeof(T));
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}
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private static object CoerceShallow(object deserializedValue, Type typeOfT)
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{
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if (deserializedValue == null)
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{
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// Return default value for type
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if (typeOfT.GetTypeInfo().IsValueType)
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{
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return Activator.CreateInstance(typeOfT);
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}
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else
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{
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return null;
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}
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}
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else if (deserializedValue is int || deserializedValue is long)
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{
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var deserializedValueLong = (long)deserializedValue;
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if (typeOfT == typeof(int)) { return (int)deserializedValueLong; }
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if (typeOfT == typeof(int?)) { return new int?((int)deserializedValueLong); }
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if (typeOfT == typeof(uint)) { return (uint)deserializedValueLong; }
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if (typeOfT == typeof(long)) { return (long)deserializedValueLong; }
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if (typeOfT == typeof(ulong)) { return (ulong)deserializedValueLong; }
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if (typeOfT == typeof(short)) { return (short)deserializedValueLong; }
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if (typeOfT == typeof(ushort)) { return (ushort)deserializedValueLong; }
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if (typeOfT == typeof(float)) { return (float)deserializedValueLong; }
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if (typeOfT == typeof(double)) { return (double)deserializedValueLong; }
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throw new ArgumentException($"Can't convert JSON value parsed as type {deserializedValue.GetType().FullName} to a value of type {typeOfT.FullName}");
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}
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else if (deserializedValue is string s)
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{
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if (typeOfT == typeof(string))
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{
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return deserializedValue;
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}
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if (typeOfT == typeof(DateTime))
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{
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return DateTime.Parse(s);
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}
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if (typeOfT == typeof(DateTime?))
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{
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return new DateTime?(DateTime.Parse(s));
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}
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throw new ArgumentException($"Can't convert JSON value parsed as type {deserializedValue.GetType().FullName} to a value of type {typeOfT.FullName}");
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}
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else if (deserializedValue is bool)
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{
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if (typeOfT == typeof(bool))
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{
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return deserializedValue;
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}
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throw new ArgumentException($"Can't convert JSON value parsed as type {deserializedValue.GetType().FullName} to a value of type {typeOfT.FullName}");
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}
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else if (deserializedValue is double)
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{
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var deserializedValueDouble = (double)deserializedValue;
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if (typeOfT == typeof(float)) { return (float)deserializedValueDouble; }
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if (typeOfT == typeof(double)) { return deserializedValueDouble; }
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throw new ArgumentException($"Can't convert JSON value parsed as type {deserializedValue.GetType().FullName} to a value of type {typeOfT.FullName}");
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}
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else if (deserializedValue is List<object>)
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{
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if (!typeOfT.IsArray)
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{
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return null;
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//throw new ArgumentException($"Can't convert JSON array to type {typeOfT.FullName}, because that's not an array type.");
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}
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var deserializedValueList = (List<object>)deserializedValue;
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var count = deserializedValueList.Count;
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var elementType = typeOfT.GetElementType();
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var result = Array.CreateInstance(elementType, count);
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for (var index = 0; index < count; index++)
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{
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var deserializedPropertyValue = deserializedValueList[index];
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var mappedPropertyValue = CoerceShallow(deserializedPropertyValue, elementType);
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result.SetValue(mappedPropertyValue, index);
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}
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return result;
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}
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else if (deserializedValue is Dictionary<string, object>)
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{
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var result = Activator.CreateInstance(typeOfT);
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var deserializedPropertyDict = (Dictionary<string, object>)deserializedValue;
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foreach (var propInfo in typeOfT.GetRuntimeProperties())
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{
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if (deserializedPropertyDict.TryGetValue(propInfo.Name, out var deserializedPropertyValue))
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{
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var setMethod = propInfo.SetMethod;
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if (!object.Equals(setMethod, null))
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{
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var mappedPropertyValue = CoerceShallow(deserializedPropertyValue, propInfo.PropertyType);
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setMethod.Invoke(result, new[] { mappedPropertyValue });
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}
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}
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}
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return result;
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}
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else
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{
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throw new ArgumentException($"Unexpected type received by CoerceShallow. Type was: { deserializedValue.GetType().FullName }");
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}
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}
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}
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}
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@ -0,0 +1,587 @@
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// From https://github.com/Jackyjjc/MiniJSON.cs @ 5665930fd7d10e41ea45152f5e1843c3fe8c2568
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// Changes:
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// - Flag top-level type as 'internal', not 'public'
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// - Add 'GetPropsAsDict' so that anonymously-typed objects are serialized as
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// JSON objects recursively, instead of as theObject.ToString()
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/*
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* Copyright (c) 2013 Calvin Rien
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*
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* Based on the JSON parser by Patrick van Bergen
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* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
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*
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* Simplified it so that it doesn't throw exceptions
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* and can be used in Unity iPhone with maximum code stripping.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Reflection;
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using System.Text;
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namespace MiniJSON {
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// Example usage:
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//
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// using UnityEngine;
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// using System.Collections;
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// using System.Collections.Generic;
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// using MiniJSON;
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//
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// public class MiniJSONTest : MonoBehaviour {
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// void Start () {
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// var jsonString = "{ \"array\": [1.44,2,3], " +
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// "\"object\": {\"key1\":\"value1\", \"key2\":256}, " +
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// "\"string\": \"The quick brown fox \\\"jumps\\\" over the lazy dog \", " +
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// "\"unicode\": \"\\u3041 Men\u00fa sesi\u00f3n\", " +
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// "\"int\": 65536, " +
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// "\"float\": 3.1415926, " +
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// "\"bool\": true, " +
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// "\"null\": null }";
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//
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// var dict = Json.Deserialize(jsonString) as Dictionary<string,object>;
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//
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// Debug.Log("deserialized: " + dict.GetType());
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// Debug.Log("dict['array'][0]: " + ((List<object>) dict["array"])[0]);
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// Debug.Log("dict['string']: " + (string) dict["string"]);
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// Debug.Log("dict['float']: " + (double) dict["float"]); // floats come out as doubles
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// Debug.Log("dict['int']: " + (long) dict["int"]); // ints come out as longs
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// Debug.Log("dict['unicode']: " + (string) dict["unicode"]);
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//
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// var str = Json.Serialize(dict);
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//
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// Debug.Log("serialized: " + str);
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// }
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// }
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/// <summary>
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/// This class encodes and decodes JSON strings.
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/// Spec. details, see http://www.json.org/
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///
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/// JSON uses Arrays and Objects. These correspond here to the datatypes IList and IDictionary.
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/// All numbers are parsed to doubles.
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/// </summary>
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internal static class Json {
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/// <summary>
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/// Parses the string json into a value
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/// </summary>
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/// <param name="json">A JSON string.</param>
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/// <returns>An List<object>, a Dictionary<string, object>, a double, an integer,a string, null, true, or false</returns>
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public static object Deserialize(string json) {
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// save the string for debug information
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if (json == null) {
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return null;
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}
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return Parser.Parse(json);
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}
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sealed class Parser : IDisposable {
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const string WORD_BREAK = "{}[],:\"";
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public static bool IsWordBreak(char c) {
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return Char.IsWhiteSpace(c) || WORD_BREAK.IndexOf(c) != -1;
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}
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const string HEX_DIGIT = "0123456789ABCDEFabcdef";
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public static bool IsHexDigit(char c) {
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return HEX_DIGIT.IndexOf(c) != -1;
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}
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enum TOKEN {
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NONE,
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CURLY_OPEN,
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CURLY_CLOSE,
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SQUARED_OPEN,
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SQUARED_CLOSE,
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COLON,
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COMMA,
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STRING,
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NUMBER,
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TRUE,
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FALSE,
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NULL
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};
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StringReader json;
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Parser(string jsonString) {
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json = new StringReader(jsonString);
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}
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public static object Parse(string jsonString) {
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using (var instance = new Parser(jsonString)) {
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return instance.ParseValue();
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}
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}
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public void Dispose() {
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json.Dispose();
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json = null;
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}
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Dictionary<string, object> ParseObject() {
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Dictionary<string, object> table = new Dictionary<string, object>();
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// ditch opening brace
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json.Read();
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// {
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while (true) {
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switch (NextToken) {
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case TOKEN.NONE:
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return null;
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case TOKEN.COMMA:
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continue;
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case TOKEN.CURLY_CLOSE:
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return table;
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case TOKEN.STRING:
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// name
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string name = ParseString();
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if (name == null) {
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return null;
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}
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// :
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if (NextToken != TOKEN.COLON) {
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return null;
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}
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// ditch the colon
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json.Read();
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// value
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TOKEN valueToken = NextToken;
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object value = ParseByToken(valueToken);
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if(value==null && valueToken!=TOKEN.NULL)
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return null;
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table[name] = value;
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break;
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default:
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return null;
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}
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}
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}
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List<object> ParseArray() {
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List<object> array = new List<object>();
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// ditch opening bracket
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json.Read();
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// [
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var parsing = true;
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while (parsing) {
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TOKEN nextToken = NextToken;
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switch (nextToken) {
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case TOKEN.NONE:
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return null;
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case TOKEN.COMMA:
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continue;
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case TOKEN.SQUARED_CLOSE:
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parsing = false;
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break;
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default:
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object value = ParseByToken(nextToken);
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if(value==null && nextToken!=TOKEN.NULL)
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return null;
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array.Add(value);
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break;
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}
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}
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return array;
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}
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object ParseValue() {
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TOKEN nextToken = NextToken;
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return ParseByToken(nextToken);
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}
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object ParseByToken(TOKEN token) {
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switch (token) {
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case TOKEN.STRING:
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return ParseString();
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case TOKEN.NUMBER:
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return ParseNumber();
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case TOKEN.CURLY_OPEN:
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return ParseObject();
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case TOKEN.SQUARED_OPEN:
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return ParseArray();
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case TOKEN.TRUE:
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return true;
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case TOKEN.FALSE:
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return false;
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case TOKEN.NULL:
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return null;
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default:
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return null;
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}
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}
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string ParseString() {
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StringBuilder s = new StringBuilder();
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char c;
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// ditch opening quote
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json.Read();
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bool parsing = true;
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while (parsing) {
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if (json.Peek() == -1) {
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parsing = false;
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break;
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}
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c = NextChar;
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switch (c) {
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case '"':
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parsing = false;
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break;
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case '\\':
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if (json.Peek() == -1) {
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parsing = false;
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break;
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}
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c = NextChar;
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switch (c) {
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case '"':
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case '\\':
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case '/':
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s.Append(c);
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break;
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case 'b':
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s.Append('\b');
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break;
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case 'f':
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s.Append('\f');
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break;
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case 'n':
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s.Append('\n');
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break;
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case 'r':
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s.Append('\r');
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break;
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case 't':
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s.Append('\t');
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break;
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case 'u':
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var hex = new char[4];
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for (int i=0; i< 4; i++) {
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hex[i] = NextChar;
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if (!IsHexDigit(hex[i]))
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return null;
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}
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s.Append((char) Convert.ToInt32(new string(hex), 16));
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break;
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}
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break;
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default:
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s.Append(c);
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break;
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}
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}
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return s.ToString();
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}
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object ParseNumber() {
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string number = NextWord;
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if (number.IndexOf('.') == -1 && number.IndexOf('E') == -1 && number.IndexOf('e') == -1) {
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long parsedInt;
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Int64.TryParse(number, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out parsedInt);
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return parsedInt;
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}
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double parsedDouble;
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Double.TryParse(number, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out parsedDouble);
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return parsedDouble;
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}
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void EatWhitespace() {
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while (Char.IsWhiteSpace(PeekChar)) {
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json.Read();
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if (json.Peek() == -1) {
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break;
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}
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}
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}
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char PeekChar {
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get {
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return Convert.ToChar(json.Peek());
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}
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}
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char NextChar {
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get {
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return Convert.ToChar(json.Read());
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}
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}
|
||||
|
||||
string NextWord {
|
||||
get {
|
||||
StringBuilder word = new StringBuilder();
|
||||
|
||||
while (!IsWordBreak(PeekChar)) {
|
||||
word.Append(NextChar);
|
||||
|
||||
if (json.Peek() == -1) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return word.ToString();
|
||||
}
|
||||
}
|
||||
|
||||
TOKEN NextToken {
|
||||
get {
|
||||
EatWhitespace();
|
||||
|
||||
if (json.Peek() == -1) {
|
||||
return TOKEN.NONE;
|
||||
}
|
||||
|
||||
switch (PeekChar) {
|
||||
case '{':
|
||||
return TOKEN.CURLY_OPEN;
|
||||
case '}':
|
||||
json.Read();
|
||||
return TOKEN.CURLY_CLOSE;
|
||||
case '[':
|
||||
return TOKEN.SQUARED_OPEN;
|
||||
case ']':
|
||||
json.Read();
|
||||
return TOKEN.SQUARED_CLOSE;
|
||||
case ',':
|
||||
json.Read();
|
||||
return TOKEN.COMMA;
|
||||
case '"':
|
||||
return TOKEN.STRING;
|
||||
case ':':
|
||||
return TOKEN.COLON;
|
||||
case '0':
|
||||
case '1':
|
||||
case '2':
|
||||
case '3':
|
||||
case '4':
|
||||
case '5':
|
||||
case '6':
|
||||
case '7':
|
||||
case '8':
|
||||
case '9':
|
||||
case '-':
|
||||
return TOKEN.NUMBER;
|
||||
}
|
||||
|
||||
switch (NextWord) {
|
||||
case "false":
|
||||
return TOKEN.FALSE;
|
||||
case "true":
|
||||
return TOKEN.TRUE;
|
||||
case "null":
|
||||
return TOKEN.NULL;
|
||||
}
|
||||
|
||||
return TOKEN.NONE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
|
||||
/// </summary>
|
||||
/// <param name="obj">A Dictionary<string, object> / List<object></param>
|
||||
/// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
|
||||
public static string Serialize(object obj) {
|
||||
return Serializer.Serialize(obj);
|
||||
}
|
||||
|
||||
sealed class Serializer {
|
||||
StringBuilder builder;
|
||||
|
||||
Serializer() {
|
||||
builder = new StringBuilder();
|
||||
}
|
||||
|
||||
public static string Serialize(object obj) {
|
||||
var instance = new Serializer();
|
||||
|
||||
instance.SerializeValue(obj);
|
||||
|
||||
return instance.builder.ToString();
|
||||
}
|
||||
|
||||
void SerializeValue(object value) {
|
||||
IList asList;
|
||||
IDictionary asDict;
|
||||
string asStr;
|
||||
|
||||
if (value == null) {
|
||||
builder.Append("null");
|
||||
} else if ((asStr = value as string) != null) {
|
||||
SerializeString(asStr);
|
||||
} else if (value is bool) {
|
||||
builder.Append((bool) value ? "true" : "false");
|
||||
} else if ((asList = value as IList) != null) {
|
||||
SerializeArray(asList);
|
||||
} else if ((asDict = value as IDictionary) != null) {
|
||||
SerializeObject(asDict);
|
||||
} else if (value is char) {
|
||||
SerializeString(new string((char) value, 1));
|
||||
} else {
|
||||
SerializeOther(value);
|
||||
}
|
||||
}
|
||||
|
||||
void SerializeObject(IDictionary obj) {
|
||||
bool first = true;
|
||||
|
||||
builder.Append('{');
|
||||
|
||||
foreach (object e in obj.Keys) {
|
||||
if (!first) {
|
||||
builder.Append(',');
|
||||
}
|
||||
|
||||
SerializeString(e.ToString());
|
||||
builder.Append(':');
|
||||
|
||||
SerializeValue(obj[e]);
|
||||
|
||||
first = false;
|
||||
}
|
||||
|
||||
builder.Append('}');
|
||||
}
|
||||
|
||||
void SerializeArray(IList anArray) {
|
||||
builder.Append('[');
|
||||
|
||||
bool first = true;
|
||||
|
||||
for (int i=0; i<anArray.Count; i++) {
|
||||
object obj = anArray[i];
|
||||
if (!first) {
|
||||
builder.Append(',');
|
||||
}
|
||||
|
||||
SerializeValue(obj);
|
||||
|
||||
first = false;
|
||||
}
|
||||
|
||||
builder.Append(']');
|
||||
}
|
||||
|
||||
void SerializeString(string str) {
|
||||
builder.Append('\"');
|
||||
|
||||
char[] charArray = str.ToCharArray();
|
||||
for (int i=0; i<charArray.Length; i++) {
|
||||
char c = charArray[i];
|
||||
switch (c) {
|
||||
case '"':
|
||||
builder.Append("\\\"");
|
||||
break;
|
||||
case '\\':
|
||||
builder.Append("\\\\");
|
||||
break;
|
||||
case '\b':
|
||||
builder.Append("\\b");
|
||||
break;
|
||||
case '\f':
|
||||
builder.Append("\\f");
|
||||
break;
|
||||
case '\n':
|
||||
builder.Append("\\n");
|
||||
break;
|
||||
case '\r':
|
||||
builder.Append("\\r");
|
||||
break;
|
||||
case '\t':
|
||||
builder.Append("\\t");
|
||||
break;
|
||||
default:
|
||||
int codepoint = Convert.ToInt32(c);
|
||||
if ((codepoint >= 32) && (codepoint <= 126)) {
|
||||
builder.Append(c);
|
||||
} else {
|
||||
builder.Append("\\u");
|
||||
builder.Append(codepoint.ToString("x4"));
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
builder.Append('\"');
|
||||
}
|
||||
|
||||
void SerializeOther(object value) {
|
||||
// NOTE: decimals lose precision during serialization.
|
||||
// They always have, I'm just letting you know.
|
||||
// Previously floats and doubles lost precision too.
|
||||
if (value is float) {
|
||||
builder.Append(((float) value).ToString("R", System.Globalization.CultureInfo.InvariantCulture));
|
||||
} else if (value is int
|
||||
|| value is uint
|
||||
|| value is long
|
||||
|| value is sbyte
|
||||
|| value is byte
|
||||
|| value is short
|
||||
|| value is ushort
|
||||
|| value is ulong) {
|
||||
builder.Append(value);
|
||||
} else if (value is double
|
||||
|| value is decimal) {
|
||||
builder.Append(Convert.ToDouble(value).ToString("R", System.Globalization.CultureInfo.InvariantCulture));
|
||||
} else {
|
||||
SerializeObject(GetPropsAsDict(value));
|
||||
}
|
||||
}
|
||||
|
||||
private Dictionary<string, object> GetPropsAsDict(object value)
|
||||
{
|
||||
var propsDict = new Dictionary<string, object>();
|
||||
var propInfos = value.GetType().GetRuntimeProperties();
|
||||
foreach (var pi in propInfos)
|
||||
{
|
||||
var getMethod = pi.GetMethod;
|
||||
if (getMethod != null)
|
||||
{
|
||||
propsDict[pi.Name] = getMethod.Invoke(value, null);
|
||||
}
|
||||
}
|
||||
|
||||
return propsDict;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,6 +1,7 @@
|
|||
// Copyright (c) .NET Foundation. All rights reserved.
|
||||
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
|
||||
|
||||
using System.Linq;
|
||||
using WebAssembly;
|
||||
|
||||
namespace Microsoft.Blazor.Browser.Interop
|
||||
|
|
@ -10,6 +11,24 @@ namespace Microsoft.Blazor.Browser.Interop
|
|||
/// </summary>
|
||||
public static class RegisteredFunction
|
||||
{
|
||||
/// <summary>
|
||||
/// Invokes the JavaScript function registered with the specified identifier.
|
||||
/// Arguments and return values are marshalled via JSON serialization.
|
||||
/// </summary>
|
||||
/// <typeparam name="TRes">The .NET type corresponding to the function's return value type. This type must be JSON deserializable.</typeparam>
|
||||
/// <param name="identifier">The identifier used when registering the target function.</param>
|
||||
/// <param name="args">The arguments to pass, each of which must be JSON serializable.</param>
|
||||
/// <returns>The result of the function invocation.</returns>
|
||||
public static TRes Invoke<TRes>(string identifier, params object[] args)
|
||||
{
|
||||
// This is a low-perf convenience method that bypasses the need to deal with
|
||||
// .NET memory and data structures on the JS side
|
||||
var argsJson = args.Select(Json.Serialize);
|
||||
var resultJson = InvokeUnmarshalled<string>("__blazor_InvokeJson",
|
||||
argsJson.Prepend(identifier).ToArray());
|
||||
return Json.Deserialize<TRes>(resultJson);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Invokes the JavaScript function registered with the specified identifier.
|
||||
///
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
<Project Sdk="Microsoft.NET.Sdk">
|
||||
|
||||
<PropertyGroup>
|
||||
<TargetFramework>netcoreapp2.0</TargetFramework>
|
||||
<TargetFramework>netstandard2.0</TargetFramework>
|
||||
</PropertyGroup>
|
||||
|
||||
</Project>
|
||||
|
|
|
|||
Loading…
Reference in New Issue