public string GetSafeIdentifier(string name)
{
if (string.IsNullOrEmpty(name))
{
return(name);
}
// NOTE: "partial" differs in behavior on macOS vs. Windows, Windows reports "partial" as a valid identifier
// This check ensures the same output on both platforms
switch (name)
{
case "partial": return(name);
// `this` isn't in TypeNameUtilities.reserved_keywords; special-case.
case "this": return("this_");
}
// In the ideal world, it should not be applied twice.
// Sadly that is not true in reality, so we need to exclude non-symbols
// when replacing the argument name with a valid identifier.
// (ReturnValue.ToNative() takes an argument which could be either an expression or mere symbol.)
if (name [name.Length - 1] != ')' && !name.Contains('.') && !name.StartsWith("@"))
{
if (!IdentifierValidator.IsValidIdentifier(name) ||
Array.BinarySearch(TypeNameUtilities.reserved_keywords, name) >= 0)
{
name = name + "_";
}
}
return(name.Replace('$', '_'));
}
/// <summary>
/// Sets the value of a variable referenced within the expression prior
/// to evaluation. This override allows specifying the Type of the variable
/// instead of trying to introspect it. Also allows for passing null as the
/// value.
/// </summary>
/// <param name="name">
/// Name of the variable referenced within the expression.
/// </param>
/// <param name="value">
/// Value of the variable that should be used when evaluating the expression.
/// </param>
/// <param name="type">
/// The variable Type.
/// </param>
public void SetVariable(
string name,
object value,
Type type)
{
if (variables.ContainsKey(name))
{
variables[name].Value = value;
}
else
{
if (IdentifierValidator.IsValidIdentifier(name))
{
variables[name] = new Variable
{
Type = type,
Value = value
};
initialized = false;
}
else
{
throw new ArgumentException("Invalid value passed in for variable name. " +
"Valid variable names must start with a letter or underscore, and not contain any whitespace.");
}
}
}
public void IsValidIdentifier()
{
Assert.IsTrue(IdentifierValidator.IsValidIdentifier("name"));
Assert.IsTrue(IdentifierValidator.IsValidIdentifier("Name_With_Underscores"));
// Yes, this is "wrong" -- keywords aren't identifiers -- but the keyword check is done elsewhere.
Assert.IsTrue(IdentifierValidator.IsValidIdentifier("true"));
Assert.IsFalse(IdentifierValidator.IsValidIdentifier("name-with-hyphens and spaces"));
Assert.IsFalse(IdentifierValidator.IsValidIdentifier("123"));
}
