private static bool CanBeMarkedAsConst(
SeparatedSyntaxList <VariableDeclaratorSyntax> variables,
SyntaxList <StatementSyntax> statements,
int startIndex)
{
MarkLocalVariableAsConstWalker walker = MarkLocalVariableAsConstWalkerCache.GetInstance();
foreach (VariableDeclaratorSyntax variable in variables)
{
walker.Identifiers.Add(variable.Identifier.ValueText);
}
for (int i = startIndex; i < statements.Count; i++)
{
walker.Visit(statements[i]);
if (walker.IsMatch)
{
MarkLocalVariableAsConstWalkerCache.Free(walker);
return(false);
}
}
MarkLocalVariableAsConstWalkerCache.Free(walker);
return(true);
}
private static bool IsAnyVariableAssigned(SeparatedSyntaxList <VariableDeclaratorSyntax> variables, SyntaxList <StatementSyntax> statements, int startIndex)
{
for (int i = startIndex; i < statements.Count; i++)
{
MarkLocalVariableAsConstWalker walker = MarkLocalVariableAsConstWalkerCache.Acquire();
walker.Visit(statements[i]);
HashSet <string> assigned = MarkLocalVariableAsConstWalkerCache.GetAssignedAndRelease(walker);
if (assigned != null)
{
foreach (VariableDeclaratorSyntax variable in variables)
{
if (assigned.Contains(variable.Identifier.ValueText))
{
return(true);
}
}
walker.Clear();
}
}
return(false);
}
public static HashSet <string> GetAssignedAndRelease(MarkLocalVariableAsConstWalker walker)
{
HashSet <string> assigned = walker.Assigned;
Release(walker);
return(assigned);
}
public static MarkLocalVariableAsConstWalker GetInstance()
{
MarkLocalVariableAsConstWalker walker = _cachedInstance;
if (walker != null)
{
_cachedInstance = null;
walker.Reset();
return(walker);
}
return(new MarkLocalVariableAsConstWalker());
}
public static MarkLocalVariableAsConstWalker Acquire()
{
MarkLocalVariableAsConstWalker walker = _cachedInstance;
if (walker != null)
{
_cachedInstance = null;
walker.Clear();
return(walker);
}
return(new MarkLocalVariableAsConstWalker());
}
public static void Free(MarkLocalVariableAsConstWalker walker)
{
_cachedInstance = walker;
}
