public static mysToken Evaluate(
mysSymbol symbol,
mysToken value,
Stack<mysSymbolSpace> spaceStack
)
{
// NOTICE THIS
// since each function has it's own internal space
// before grabbing our reference to the space in which
// we want to define our symbol, we need to pop the
// internal off, or we're going to be defining the symbol
// in our internal space, i.e. it will scope out as soon as
// we're done. So we pop the internal off, grab our reference
// to the space outside of that, then push the internal back on.
mysSymbolSpace top = spaceStack.Pop();
mysSymbolSpace ss = spaceStack.Peek();
if ( value.Type == typeof(mysFunction) ) {
defineFunction(
symbol,
value.Value as mysFunction,
spaceStack.Peek()
);
} else {
mysSymbolSpace space = symbol.DefinedIn( spaceStack );
if ( space != null ) {
space.Define( symbol, value );
} else {
ss.Define( symbol, value );
}
}
spaceStack.Push( top );
return null;
}
void eat( mysToken token )
{
Tokens.Add( token.Quote( quote ) );
quote = false;
removeCurrent();
}
