45 lines
1.6 KiB
C#
45 lines
1.6 KiB
C#
// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT License.
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using RulesEngine.HelperFunctions;
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using RulesEngine.Models;
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using System;
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namespace RulesEngine.ExpressionBuilders
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{
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/// <summary>
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/// This class will build the list expression
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/// </summary>
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internal sealed class LambdaExpressionBuilder : RuleExpressionBuilderBase
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{
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private readonly ReSettings _reSettings;
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private readonly RuleExpressionParser _ruleExpressionParser;
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internal LambdaExpressionBuilder(ReSettings reSettings, RuleExpressionParser ruleExpressionParser)
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{
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_reSettings = reSettings;
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_ruleExpressionParser = ruleExpressionParser;
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}
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internal override RuleFunc<RuleResultTree> BuildDelegateForRule(Rule rule, RuleParameter[] ruleParams)
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{
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try
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{
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var ruleDelegate = _ruleExpressionParser.Compile<bool>(rule.Expression, ruleParams);
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bool func(object[] paramList) => ruleDelegate(paramList);
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return Helpers.ToResultTree(rule, null, func);
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}
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catch (Exception ex)
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{
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ex.Data.Add(nameof(rule.RuleName), rule.RuleName);
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ex.Data.Add(nameof(rule.Expression), rule.Expression);
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if (!_reSettings.EnableExceptionAsErrorMessage) throw;
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bool func(object[] param) => false;
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var exceptionMessage = $"Exception while parsing expression `{rule?.Expression}` - {ex.Message}";
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return Helpers.ToResultTree(rule, null, func, exceptionMessage);
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}
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}
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}
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}
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