public void SelfReferenceSubstituteTest()
{
var ast1 = new ArithmExprNode(1,
new IdNode(1, "x"),
ArithmOpNode.FromSymbol(1, "+"),
new ArithmExprNode(1,
new IdNode(1, "y"),
ArithmOpNode.FromSymbol(1, "+"),
new IdNode(1, "x")
)
);
var repl = new ArithmExprNode(1,
new IdNode(1, "y"),
new ArithmOpNode(1, "-", BinaryOperations.ArithmeticFromSymbol("-")),
new IdNode(1, "x")
);
var ast2 = new ArithmExprNode(1,
new IdNode(1, "x"),
ArithmOpNode.FromSymbol(1, "+"),
new ArithmExprNode(1,
repl,
ArithmOpNode.FromSymbol(1, "+"),
new IdNode(1, "x")
)
);
Assert.That(ast1.Substitute(new IdNode(2, "y"), repl), Is.EqualTo(ast2));
}
public static ArithmOpNode FromSymbol(int line, string symbol) => new ArithmOpNode(line, symbol, BinaryOperations.ArithmeticFromSymbol(symbol));