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36 lines
981 B
36 lines
981 B
using System.Linq.Expressions;
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using Connected.Expressions.Visitors;
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namespace Connected.Expressions.Evaluation;
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internal sealed class ExpressionReplacer : DatabaseVisitor
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{
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private readonly Expression _searchFor;
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private readonly Expression _replaceWith;
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private ExpressionReplacer(Expression searchFor, Expression replaceWith)
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{
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_searchFor = searchFor;
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_replaceWith = replaceWith;
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}
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public static Expression Replace(Expression expression, Expression searchFor, Expression replaceWith)
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{
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return new ExpressionReplacer(searchFor, replaceWith).Visit(expression);
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}
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public static Expression ReplaceAll(Expression expression, Expression[] searchFor, Expression[] replaceWith)
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{
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for (int i = 0, n = searchFor.Length; i < n; i++)
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expression = Replace(expression, searchFor[i], replaceWith[i]);
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return expression;
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}
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protected override Expression? Visit(Expression? exp)
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{
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if (exp == _searchFor)
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return _replaceWith;
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return base.Visit(exp);
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}
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} |