6a36cbd6a3
The JavaScriptEvaluator now accepts an options parameter of type ExpressionEvaluatorOptions. This allows adding custom arguments to the evaluation context. An 'Empty' static instance of ExpressionEvaluatorOptions is added for convenience. Additionally, the usage of MassTransitAzureServiceBus in Program.cs is turned off by setting the flag to 'false'.
42 lines
1.4 KiB
C#
42 lines
1.4 KiB
C#
using System.Dynamic;
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using Elsa.Expressions.Contracts;
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using Elsa.Expressions.Helpers;
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using Elsa.Expressions.Models;
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using Elsa.JavaScript.Contracts;
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using Humanizer;
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using Jint;
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namespace Elsa.JavaScript.Expressions;
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/// <summary>
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/// Evaluates JavaScript expressions.
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/// </summary>
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public class JavaScriptExpressionHandler : IExpressionHandler
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{
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private readonly IJavaScriptEvaluator _javaScriptEvaluator;
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/// <summary>
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/// Initializes a new instance of the <see cref="JavaScriptExpressionHandler"/> class.
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/// </summary>
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public JavaScriptExpressionHandler(IJavaScriptEvaluator javaScriptEvaluator)
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{
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_javaScriptEvaluator = javaScriptEvaluator;
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}
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/// <inheritdoc />
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public async ValueTask<object?> EvaluateAsync(Expression expression, Type returnType, ExpressionExecutionContext context, ExpressionEvaluatorOptions options)
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{
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var javaScriptExpression = expression.Value.ConvertTo<string>() ?? "";
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return await _javaScriptEvaluator.EvaluateAsync(javaScriptExpression, returnType, context, options, engine => ConfigureEngine(engine, options), context.CancellationToken);
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}
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private void ConfigureEngine(Engine engine, ExpressionEvaluatorOptions options)
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{
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var args = new ExpandoObject() as IDictionary<string, object>;
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foreach (var (name, value) in options.Arguments)
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args[name.Camelize()] = value;
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engine.SetValue("args", args);
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}
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} |