public ElaProgram()
{
TopLevel = new ElaEquationSet();
Includes = new List<ElaModuleInclude>();
}
void DoBlockStmt(ref ElaExpression eqt)
{
var cexp1 = default(ElaExpression);
var cexp2 = default(ElaExpression);
if (StartOf(4)) {
EmbExpr(out cexp1);
if (la.kind == 64) {
Get();
EmbExpr(out cexp2);
}
ProcessDoBlock(cexp1, cexp2, ref eqt);
} else if (la.kind == 32) {
scanner.InjectBlock();
var eqs = new ElaEquationSet();
Get();
Binding(eqs);
if (eqt.Type == ElaNodeType.LetBinding)
((ElaLetBinding)eqt).Equations.Equations.AddRange(eqs.Equations);
else
{
var lt = new ElaLetBinding(t);
lt.Equations = eqs;
if (eqt.Type == ElaNodeType.Lambda)
((ElaLambda)eqt).Right = lt;
else
lt.Expression = eqt;
eqt = lt;
}
EndBlock();
} else SynErr(117);
}
//Compiles a provided set of equations. This method is to be used for local
//scopes only.
private void CompileEquationSet(ElaEquationSet set, LabelMap map)
{
var list = RunForwardDeclaration(set.Equations, map);
list = ProcessFunctions(list, map);
list = ProcessBindings(list, map);
//Expressions are not allowed in this context
if (list.Count > 0)
for (var i = 0; i < list.Count; i++)
AddError(ElaCompilerError.InvalidExpression, list[i], FormatNode(list[i]));
}
void BindingChain(out ElaEquationSet block)
{
block = new ElaEquationSet();
scanner.InjectBlock();
Binding(block);
if (RequireEndBlock())
EndBlock();
while (StartOf(3)) {
scanner.InjectBlock();
Binding(block);
if (RequireEndBlock())
EndBlock();
}
}
void Binding(ElaEquationSet block)
{
var bid = default(ElaEquation);
var left = default(ElaExpression);
var right = default(ElaExpression);
Expr(out left);
bid = new ElaEquation(t);
if (la.kind == 23 || la.kind == 51 || la.kind == 57) {
if (la.kind == 57) {
Get();
Expr(out right);
} else if (la.kind == 23) {
Get();
Guard(out right);
} else {
Attribute(ref left);
}
}
if (la.kind == 43) {
var cb = default(ElaEquationSet);
WhereBinding(out cb);
if (left != null && left.Type == ElaNodeType.Header)
AddError(ElaParserError.InvalidAttributeWhere);
var letb = new ElaLetBinding();
if (cb != null) letb.SetLinePragma(cb.Line, cb.Column);
letb.Equations = cb;
if (right != null)
{
letb.Expression = right;
right = letb;
}
else
{
letb.Expression = left;
left = letb;
}
}
ProcessBinding(block, bid, left, right);
}
void WhereBinding(out ElaEquationSet block)
{
scanner.InjectBlock();
bindings.Push(null);
var skip = false;
while (!(la.kind == 0 || la.kind == 43)) {SynErr(101); Get();}
Expect(43);
if (la.kind == 50) {
EndBlock();
skip=true;
}
BindingChain(out block);
bindings.Pop();
if (!skip)
EndBlock();
}
private void ProcessBinding(ElaEquationSet block, ElaEquation bid, ElaExpression left, ElaExpression right)
{
bid.Left = left;
bid.Right = right;
if (bindings.Peek() == unit)
{
block.Equations.Add(bid);
return;
}
var fName = default(String);
if (right != null && left.Type == ElaNodeType.Juxtaposition && !left.Parens)
{
var fc = (ElaJuxtaposition)left;
if (fc.Target.Type == ElaNodeType.NameReference)
fName = fc.Target.GetName();
}
if (fName != null)
{
var lastB = bindings.Peek();
if (lastB != null && ((ElaJuxtaposition)lastB.Left).Target.GetName() == fName)
lastB.Next = bid;
else
block.Equations.Add(bid);
bindings.Pop();
bindings.Push(bid);
}
else
block.Equations.Add(bid);
}
public ElaProgram()
{
TopLevel = new ElaEquationSet();
Includes = new List <ElaModuleInclude>();
}