public static ISequence Reverse(ISequence s)
{
Pair list = null;
ISequence o = s;
while (o != null)
{
list = new Pair(o.First(), list);
o = o.Rest();
}
return list;
}
public static Pair List(IEnumerable args)
{
Pair c = null;
foreach (object arg in args)
{
c = new Pair(arg, c);
}
return (Pair)Reverse(c);
}
public virtual Pair ToList()
{
Pair result = null;
foreach (object o in this)
{
result = new Pair(o, result);
}
return (Pair)result.Reverse();
}
public static Pair FromArray(object[] os, int skip)
{
int i = 0;
Pair x = null;
foreach (object o in os)
{
if (i++ >= skip)
x = new Pair(o, x);
}
x = (Pair)Reverse(x);
return x;
}
public static ISequence Join(IEnumerable os)
{
Pair foo = null;
foreach (object o in os)
{
foo = new Pair(o, foo);
}
ISequence bar = null;
foreach (object o in foo)
{
bar = Join(Seq(o), bar);
}
return bar;
}
public static ISequence Range(int start, int finish, int step)
{
Pair result = null;
for (int i = start; i < finish; i += step)
{
result = new Pair(i, result);
}
return result.Reverse();
}
public static object QuasiQuote(Object form, Environment environment)
{
if (!(form is Pair))
return form;
Pair expression = (Pair)form;
Pair result = null;
foreach (object item in expression)
{
if (item is Pair)
{
Pair list = (Pair)item;
if (list.First() == QUASIQUOTE)
{
result = new Pair(QuasiQuote(list.Second(), environment), result);
}
else if (list.First() == UNQUOTE)
{
result = new Pair(Compiler.Eval(QuasiQuote(list.Second(), environment), environment), result);
}
else if (list.First() == UNQUOTE_SPLICING)
{
object l = Compiler.Eval(QuasiQuote(list.Second(), environment), environment);
if (l is Sequence)
{
foreach (object o in (Sequence)l)
{
result = new Pair(o, result);
}
}
}
else
{
result = new Pair(QuasiQuote(item, environment), result);
}
}
else
{
result = new Pair(item, result);
}
}
if (result is Pair)
result = (Pair)Reverse((ISequence)result);
return result;
}
public static object CompileQuasiQuote(int level, object arg, Environment environment)
{
if (level == 0)
return Compile1(arg, environment);
if (arg is ISequence)
{
ISequence c = (ISequence)arg;
if (c.First() == UNQUOTE)
{
return new Pair(UNQUOTE,new Pair(CompileQuasiQuote(level - 1, Runtime.Car(Runtime.Cdr(arg)),environment)));
}
if ((level == 1) && (c.First() == UNQUOTE_SPLICING))
{
return new Pair(UNQUOTE_SPLICING, new Pair(CompileQuasiQuote(level - 1, Runtime.Car(Runtime.Cdr(arg)), environment)));
}
if (c.First() == QUASIQUOTE)
{
return new Pair(QUASIQUOTE, new Pair(CompileQuasiQuote(level + 1, Runtime.Car(Runtime.Cdr(arg)), environment)));
}
Pair r = null;
foreach (object o in c)
{
r = new Pair(CompileQuasiQuote(level, o,environment), r);
}
return r.Reverse();
}
return arg;
}
public static Expression CompileMac(object stuff, Environment environment)
{
object args = ((Pair)stuff).First();
Pair body = (Pair)((Pair)stuff).Rest();
string doc = "";
if ((body.Length() > 1) && (body.First() is string))
{
doc = (string)body.First();
body = (Pair)body.Rest();
}
Pair implicitProgn = new Pair(PROGN, body); // Dangerous if it gets redefined
object v = Compile(implicitProgn, environment);
return Expression.Call(null, makeMacroMethodInfo, Expression.Constant(args), Expression.Constant(v), Expression.Constant(doc), environmentParameter);
}
public static Expression CompileCall(Pair c, Environment environment)
{
string dotNetExpression = ((Symbol)c.First()).Name;
int n = dotNetExpression.LastIndexOf('.');
string typeName = dotNetExpression.Substring(0, n);
string methodName = dotNetExpression.Substring(n + 1);
Type t = ClrGlue.FindType(typeName, Runtime.Namespaces);
MemberInfo m = ClrGlue.FindUnambiguousMember(methodName, t, c.Length() - 1);
if (m == null)
{
// If we cant find an unambiguos MemberInfo then we'll
// have to compile a call to CallStaticMethod instead.
// This will look for a method again reflectively at
// runtime, so this will be a performance hit
Expression[] es = CompileArgs1(c.Rest(), environment);
Expression[] ees = new Expression[3];
ees[0] = Expression.Constant(methodName);
ees[1] = Expression.Constant(t, typeof(Type));
ees[2] = Expression.NewArrayInit(typeof(object), es);
return Expression.Call(null, callStaticMethodMethodInfo, ees);
}
else
{
// We know what we're doing at compile time, so lets compile
// up the call now.
// No need for runtime reflection = better performance !!
if (m is MethodInfo)
{
if (((MethodInfo)m).IsStatic)
{
Expression[] es = CompileArgsX(c.Rest(), ((MethodInfo)m).GetParameters(), environment);
return Expression.Call(null, (MethodInfo)m, es);
}
else
{
// Its a virtual call
Expression[] es = CompileArgsX(c.Rest().Rest(), ((MethodInfo)m).GetParameters(), environment);
Expression o = Compile1(c.Rest().First(),environment);
return Expression.Call(o, (MethodInfo)m, es);
}
}
if (m is PropertyInfo)
return Expression.Property(null, (PropertyInfo)m);
if (m is FieldInfo)
return Expression.Field(null, (FieldInfo)m);
return null;
}
}