60 lines
2.0 KiB
C#
60 lines
2.0 KiB
C#
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using QFSW.QC.Utilities;
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using System;
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using System.Text.RegularExpressions;
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namespace QFSW.QC.Grammar
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{
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public class ExpressionBodyGrammar : IQcGrammarConstruct
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{
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private readonly Regex _expressionBodyRegex = new Regex(@"^{.+}\??$");
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public int Precedence => 0;
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public bool Match(string value, Type type)
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{
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return _expressionBodyRegex.IsMatch(value);
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}
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public object Parse(string value, Type type, Func<string, Type, object> recursiveParser)
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{
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bool nullable = false;
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if (value.EndsWith("?"))
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{
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nullable = true;
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value = value.Substring(0, value.Length - 1);
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}
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value = value.ReduceScope('{', '}');
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object result = QuantumConsoleProcessor.InvokeCommand(value);
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if (result is null)
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{
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if (nullable)
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{
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if (type.IsClass)
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{
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return result;
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}
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else
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{
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throw new ParserInputException($"Expression body {{{value}}} evaluated to null which is incompatible with the expected type '{type.GetDisplayName()}'.");
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}
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}
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else
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{
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throw new ParserInputException($"Expression body {{{value}}} evaluated to null. If this is intended, please use nullable expression bodies, {{expr}}?");
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}
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}
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else if (result.GetType().IsCastableTo(type, true))
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{
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return type.Cast(result);
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}
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else
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{
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throw new ParserInputException($"Expression body {{{value}}} evaluated to an object of type '{result.GetType().GetDisplayName()}', " +
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$"which is incompatible with the expected type '{type.GetDisplayName()}'.");
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}
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}
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}
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}
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