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49 lines
1.0 KiB
49 lines
1.0 KiB
using System.Linq.Expressions;
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using Connected.Expressions.Mappings;
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using ExpressionVisitor = Connected.Expressions.Visitors.ExpressionVisitor;
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namespace Connected.Expressions.Evaluation;
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internal sealed class ColumnNominator : ExpressionVisitor
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{
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private ColumnNominator()
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{
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Candidates = new HashSet<Expression>();
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}
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private HashSet<Expression> Candidates { get; set; }
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private bool CannotBeEvaluated { get; set; }
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public static HashSet<Expression> Nominate(Expression expression)
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{
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var nominator = new ColumnNominator();
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nominator.Visit(expression);
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return nominator.Candidates;
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}
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protected override Expression? Visit(Expression? expression)
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{
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if (expression is not null)
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{
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var saveCannotBeEvaluated = CannotBeEvaluated;
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CannotBeEvaluated = false;
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base.Visit(expression);
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if (!CannotBeEvaluated)
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{
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if (MappingsCache.CanEvaluateLocally(expression))
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Candidates.Add(expression);
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else
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CannotBeEvaluated = true;
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}
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CannotBeEvaluated |= saveCannotBeEvaluated;
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}
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return expression;
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}
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} |