public static Assignment Assignment(
this Random random,
IReadOnlyCollection <Variable> declaredVariables,
IReadOnlyCollection <FunctionDeclaration> declaredFunctions)
{
var to = random.From(declaredVariables);
// prevent assigning to function parameter
while (to.IsFunctionParameter)
{
to = random.From(declaredVariables);
}
var expr = random.Expression(declaredVariables, declaredFunctions);
// prevent variable self-assignments e.g. 'x0 = x0'
while (expr is Variable v && v.VariableName == to.VariableName)
{
expr = random.Expression(declaredVariables, declaredFunctions);
}
// ensure all initializers are used; e.g. no 'int a = 10; a = 20;'
expr = new BinaryOperation(to, random.Operator(), expr);
return(new Assignment(to, expr));
}
public static Return Return(
this Random random,
IReadOnlyCollection <Variable> declaredVariables,
IReadOnlyCollection <FunctionDeclaration> declaredFunctions)
{
IExpr expr = random.Expression(declaredVariables, declaredFunctions);
// function return prevents unused variable warnings
foreach (var v in declaredVariables)
{
expr = new BinaryOperation(expr, random.Operator(), v);
}
return(new Return(expr));
}