5d1a1aaf86
* Initial version of c# expressions * Add support for strongly-typed workflow variable accessors * Fix type casting * Rename c# to C# in XML comments * Rename Globals.Context to ExecutionContext and Variables to Context * Move RunJavaScript activity to Elsa.JavaScript * Add RunCSharp activity * Add CSharpOptions * Add common workflow properties and methods
76 lines
2.9 KiB
C#
76 lines
2.9 KiB
C#
using System.Runtime.CompilerServices;
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using Elsa.Extensions;
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using Elsa.JavaScript.Contracts;
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using Elsa.Workflows.Core;
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using Elsa.Workflows.Core.Attributes;
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using Elsa.Workflows.Core.Models;
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using Jint;
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// ReSharper disable once CheckNamespace
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namespace Elsa.JavaScript.Activities;
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/// <summary>
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/// Executes JavaScript code.
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/// </summary>
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[Activity("Elsa", "Scripting", "Executes JavaScript code", DisplayName = "Run JavaScript")]
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public class RunJavaScript : CodeActivity<object?>
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{
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/// <inheritdoc />
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public RunJavaScript([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
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{
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}
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/// <inheritdoc />
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public RunJavaScript(string script, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(source, line)
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{
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Script = new Input<string>(script);
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}
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/// <summary>
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/// A list of possible outcomes. Use "setOutcome()" to set the outcome. Use "setOutcomes" to set multiple outcomes.
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/// </summary>
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[Input(Description = "A list of possible outcomes.", UIHint = InputUIHints.DynamicOutcomes)]
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public Input<ICollection<string>> PossibleOutcomes { get; set; } = default!;
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/// <summary>
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/// The script to run.
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/// </summary>
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[Input(
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Description = "The script to run.",
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UIHint = InputUIHints.CodeEditor,
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OptionsProvider = typeof(RunJavaScriptOptionsProvider)
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)]
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public Input<string> Script { get; set; } = new("");
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/// <inheritdoc />
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protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
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{
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var script = context.Get(Script);
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// If no script was specified, there's nothing to do.
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if (string.IsNullOrWhiteSpace(script))
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return;
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// Get a JavaScript evaluator.
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var javaScriptEvaluator = context.GetRequiredService<IJavaScriptEvaluator>();
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// Run the script.
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var result = await javaScriptEvaluator.EvaluateAsync(script, typeof(object), context.ExpressionExecutionContext, engine => ConfigureEngine(engine, context), context.CancellationToken);
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// Set the result as output, if any.
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if (result is not null)
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context.Set(Result, result);
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// Get the outcome or outcomes set by the script, if any. If not set, use "Done".
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var outcomes = context.TransientProperties.GetValueOrDefault("Outcomes", () => new[] { "Done" })!;
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// Complete the activity with the outcome.
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await context.CompleteActivityWithOutcomesAsync(outcomes);
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}
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private static void ConfigureEngine(Engine engine, ActivityExecutionContext context)
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{
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engine.SetValue("setOutcome", (Action<string>)(value => context.TransientProperties["Outcomes"] = new[] { value }));
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engine.SetValue("setOutcomes", (Action<string[]>)(value => context.TransientProperties["Outcomes"] = value));
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}
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} |