public void Variable_found_in_same_scope()
{
var map = new ScopedVariableMap();
map.PushScope();
Assert.That(map.TryAddVariable("a", 1), Is.True);
Assert.That(map.TryAddVariable("b", 17), Is.True);
Assert.That(map.TryGetVariable("a", out var a), Is.True);
Assert.That(a, Is.EqualTo(1));
Assert.That(map.TryGetVariable("b", out var b), Is.True);
Assert.That(b, Is.EqualTo(17));
}
public void Variable_visible_in_inner_but_not_outer_scope()
{
var map = new ScopedVariableMap();
map.PushScope();
Assert.That(map.TryAddVariable("a", 1), Is.True);
map.PushScope();
Assert.That(map.TryAddVariable("b", 2), Is.True);
Assert.That(map.TryGetVariable("b", out var index), Is.True);
Assert.That(index, Is.EqualTo(2));
map.PopScope();
Assert.That(map.TryGetVariable("b", out _), Is.False);
}
public void Pushing_and_popping_very_many_scopes()
{
var map = new ScopedVariableMap();
const int scopeCount = 100;
for (var i = 0; i < scopeCount; i++)
{
map.PushScope();
map.TryAddVariable(i.ToString(), i);
}
for (var i = 0; i < scopeCount; i++)
{
map.PopScope();
}
// Now some of the new scopes should come from the cache
// Verify that the cached scopes are empty
for (var i = 0; i < scopeCount; i++)
{
map.PushScope();
}
for (var i = 0; i < scopeCount; i++)
{
Assert.That(map.TryGetVariable(i.ToString(), out _), Is.False);
}
for (var i = 0; i < scopeCount; i++)
{
map.PopScope();
}
}
public void Cannot_do_operations_if_there_is_no_scope()
{
var map = new ScopedVariableMap();
Assert.That(() => map.TryAddVariable("a", 0), Throws.InvalidOperationException);
Assert.That(() => map.TryGetVariable("a", out _), Throws.InvalidOperationException);
Assert.That(() => map.PopScope(), Throws.InvalidOperationException);
}
public void Variable_not_found_in_any_scope()
{
var map = new ScopedVariableMap();
map.PushScope();
Assert.That(map.TryAddVariable("a", 1), Is.True);
map.PushScope();
Assert.That(map.TryAddVariable("b", 2), Is.True);
Assert.That(map.TryGetVariable("c", out _), Is.False);
}
public void Variable_found_in_outer_scope()
{
var map = new ScopedVariableMap();
map.PushScope();
Assert.That(map.TryAddVariable("a", 1), Is.True);
map.PushScope();
Assert.That(map.TryGetVariable("a", out var index), Is.True);
Assert.That(index, Is.EqualTo(1));
}
public int SmallMethod()
{
// This is based on NameParsing.IsDigit
var map = new ScopedVariableMap();
var sum = 0;
// Execute the scenario a few times to simulate the map being reused
for (var i = 0; i < 5; i++)
{
map.PushScope();
map.TryAddVariable("ch", 1);
map.TryGetVariable("ch", out var a);
map.TryGetVariable("ch", out var b);
map.PopScope();
sum += a + b;
}
return(sum);
}
public void Reset_clears_stack()
{
var map = new ScopedVariableMap();
map.PushScope();
map.PushScope();
map.TryAddVariable("a", 1);
map.PushScope();
map.Reset();
Assert.That(() => map.TryGetVariable("a", out _), Throws.InvalidOperationException);
}
public int LargerMethod()
{
// This is a synthetic benchmark, aiming to still be somewhat realistic
var map = new ScopedVariableMap();
var sum = 0;
// Execute the scenario a few times to simulate the map being reused
for (var iteration = 0; iteration < 5; iteration++)
{
// Create a lot of nested scopes and add variables to them
for (var i = 0; i < ScopeCount; i++)
{
map.PushScope();
for (var j = 0; j < VariablesPerScope; j++)
{
var index = i * ScopeCount + j;
map.TryAddVariable(_variableNames[index], index);
}
}
// Go through all the variables
for (var i = 0; i < ScopeCount * VariablesPerScope; i++)
{
// Do not go through them in exact order
map.TryGetVariable(_variableNames[i * 3 % (ScopeCount * VariablesPerScope)], out var index);
sum += index;
}
// Remove the scopes
for (var i = 0; i < ScopeCount; i++)
{
map.PopScope();
}
}
return(sum);
}