77 lines
2.7 KiB
C#
77 lines
2.7 KiB
C#
using Elsa.Expressions;
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using Elsa.Management.Models;
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using Elsa.Management.Services;
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using Elsa.Models;
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using Elsa.Services;
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namespace Elsa.Management.Providers;
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public class DefaultExpressionSyntaxProvider : IExpressionSyntaxProvider
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{
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private readonly IIdentityGenerator _identityGenerator;
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public DefaultExpressionSyntaxProvider(IIdentityGenerator identityGenerator)
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{
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_identityGenerator = identityGenerator;
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}
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public ValueTask<IEnumerable<ExpressionSyntaxDescriptor>> GetDescriptorsAsync(CancellationToken cancellationToken = default)
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{
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var literal = CreateLiteralDescriptor();
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var json = CreateJsonDescriptor();
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return ValueTask.FromResult<IEnumerable<ExpressionSyntaxDescriptor>>(new[] { literal, json });
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}
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private ExpressionSyntaxDescriptor CreateLiteralDescriptor() => CreateDescriptor<LiteralExpression>(
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"Literal",
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CreateLiteralExpression,
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context => new Literal(context.GetExpression<LiteralExpression>().Value),
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expression => expression.Value);
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private ExpressionSyntaxDescriptor CreateJsonDescriptor() => CreateDescriptor<JsonExpression>(
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"Json",
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CreateJsonExpression,
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context => new JsonObject(context.GetExpression<JsonExpression>().Value),
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expression => expression.Value);
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private ExpressionSyntaxDescriptor CreateDescriptor<TExpression>(
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string syntax,
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Func<ExpressionConstructorContext, IExpression> constructor,
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Func<LocationReferenceConstructorContext, RegisterLocationReference> createLocationReference,
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Func<TExpression, object?> expressionValue) =>
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new()
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{
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Syntax = syntax,
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Type = typeof(TExpression),
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CreateExpression = constructor,
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CreateLocationReference = context =>
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{
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var reference = createLocationReference(context);
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if (string.IsNullOrWhiteSpace(reference.Id))
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reference.Id = GenerateId();
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return reference;
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},
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CreateSerializableObject = context => new
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{
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Type = syntax,
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Value = expressionValue(context.GetExpression<TExpression>())
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}
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};
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private IExpression CreateLiteralExpression(ExpressionConstructorContext context)
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{
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var expressionValue = context.Element.GetProperty("value").ToString();
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return new LiteralExpression(expressionValue);
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}
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private IExpression CreateJsonExpression(ExpressionConstructorContext context)
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{
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var expressionValue = context.Element.GetProperty("value").ToString();
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return new JsonExpression(expressionValue);
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}
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private string GenerateId() => _identityGenerator.GenerateId();
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} |