public override void Compile(CompiledStatement parent, string token, LinkedList <string> tokens, LinkedList <string> lines)
{
base.Compile(parent, token, tokens, lines);
Debug.Assert(parent.ChildCount > 0, "No value found for the left hand side of operator: " + token);
// Take the previous statement and add it as a sub statement of the newly created operator - we will check for validity in the Compile function
parent.MoveChildAtIndex(parent.ChildCount - 1, this);
// Add this operator to the tree
parent.Add(this);
// Now check that there is another element after our operator that we can act on
Debug.Assert(tokens.Count > 0, "No value found for the right hand side of operator: " + token);
// Get the next token that appears on the right hand side of this operator
string rhsOfOperatorToken = CelesteCompiler.PopToken();
// Parse the next token which we will act on
if (CelesteCompiler.CompileToken(rhsOfOperatorToken, parent))
{
// Take the value that has been added to the root and add it under this operator instead
parent.MoveChildAtIndex(parent.ChildCount - 1, this);
}
else
{
// Error message if we cannot parse the next token
Debug.Fail("Could not compile token: " + token + " in operator " + token);
}
}
/// <summary>
/// Call compile when you wish to implement the function.
/// Process the actual variable names that have been passed into the function using the token.
/// Create a variable underneath this for each variable we are passing in.
/// </summary>
/// <param name="parent"></param>
/// <param name="token"></param>
/// <param name="tokens"></param>
/// <param name="lines"></param>
public override void Compile(CompiledStatement parent, string token, LinkedList <string> tokens, LinkedList <string> lines)
{
// We have invoked this function because we have parentheses
if (tokens.Count > 0 && tokens.First.Value == OpenParenthesis.scriptToken)
{
// Group our inputs under this object so that we can store them underneath this function
CompiledStatement thisCallsParams = new CompiledStatement();
if (ParameterNames.Count > 0)
{
// Only add our parameters if we have any.
// Otherwise this will just strip away the start and end parentheses
Add(thisCallsParams);
}
string openingParenthesis = CelesteCompiler.PopToken();
Debug.Assert(openingParenthesis == OpenParenthesis.scriptToken, "No opening parenthesis found for function " + Name);
string parameter = CelesteCompiler.PopToken();
CompiledStatement tempContainer = new CompiledStatement();
while (parameter != CloseParenthesis.scriptToken)
{
Debug.Assert(CelesteCompiler.CompileToken(parameter, tempContainer),
"Failed to compile input parameter " + parameter);
parameter = CelesteCompiler.PopToken();
}
// Add null references first for all of the parameters we are missing
for (int i = tempContainer.ChildCount; i < ParameterNames.Count; i++)
{
// This will push null onto the stack for every parameter we have not provided an input for
Reference refToNull = new Reference(null);
refToNull.Compile(thisCallsParams, "null", tokens, lines);
}
// Then add the actual parameters we have inputted
for (int i = tempContainer.ChildCount - 1; i >= 0; i--)
{
// Add our parameters in reverse order, so they get added to the stack in reverse order
tempContainer.MoveChildAtIndex(i, thisCallsParams);
}
// Add a reference to this function in our compile tree after we have added all of the inputs
base.Compile(parent, token, tokens, lines);
}
else
{
// If we have no brackets, we are trying to compile the function as a reference rather than as a call (for use in equality for example)
Reference funcRef = new Reference(this);
funcRef.Compile(parent, Name, tokens, lines);
}
// Any local variable that is not set will be null
// Any extra parameters will be added, but because we add them in reverse order, if they are not needed they will just be thrown away on the stack
}
public override void Compile(CompiledStatement parent, string token, LinkedList <string> tokens, LinkedList <string> lines)
{
base.Compile(parent, token, tokens, lines);
// Unary operators act on other variables/values and so they must be included in the same token as another token (e.g. !var for example)
// We remove the script token for the operator and split the other token out
Debug.Assert(token.Length > 1);
string rest = token.Remove(0, 1); // Removing wrong thing here
// Add this operator to the tree
parent.Add(this);
// Parse the rest of the token which we will act on
if (CelesteCompiler.CompileToken(rest, parent))
{
// Take the value that has been added to the root and add it under this operator instead
parent.MoveChildAtIndex(parent.ChildCount - 1, this);
}
else
{
// Error message if we cannot parse the next token
Debug.Fail("Could not compile token: " + token + " in operator " + token);
}
}
/// <summary>
/// If our first child is a binary operator, we swap it with this binary operator.
/// This has the effect of evaluating this before the child operator.
/// Useful when you wish to evaluate this operator before an assignment operator for example.
/// </summary>
protected void SwapWithChildBinaryOperator(CompiledStatement parent)
{
Debug.Assert(ChildCount > 0);
Debug.Assert(ChildCompiledStatements[0] is AssignmentOperator);
CompiledStatement child = ChildCompiledStatements[0];
// We start with:
//
// parent
// /
// this
// / \
// child C
// / \
// A B
MoveChildAtIndex(0, parent);
// Move the child to the parent - we now have:
//
// parent
// / \
// this child
// / / \
// C A B
Debug.Assert(parent.ChildCompiledStatements[parent.ChildCount - 2] == this);
parent.MoveChildAtIndex(parent.ChildCount - 2, child);
// Move this to be underneath the child operator - we now have:
//
// parent
// \
// child
// / | \
// A B this
// \
// C
Debug.Assert(child.ChildCount == 3);
child.MoveChildAtIndex(1, this);
// Move the B to under this - we now have:
//
// parent
// \
// child
// / \
// A this
// / \
// C B
Debug.Assert(ChildCount == 2);
MoveChildAtIndex(0, this);
// Extract and then reinsert C into this - this swaps C and B to give:
//
// parent
// \
// child
// / \
// A this
// / \
// B C
}