Add vertices and points, messy!

[linpy.git] / pypol / domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index 4a1f9aa..f3f551a 100644 (file)
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -5,7 +5,7 @@ import re
 from . import islhelper
 
 from .islhelper import mainctx, libisl, isl_set_basic_sets
-from .linexprs import Expression
+from .linexprs import Expression, Symbol
 
 
 __all__ = [
@@ -50,7 +50,7 @@ class Domain:
         symbols = set()
         for item in iterator:
             symbols.update(item.symbols)
-        return tuple(sorted(symbols))
+        return tuple(sorted(symbols, key=Symbol.sortkey))
 
     @property
     def polyhedra(self):
@@ -139,7 +139,7 @@ class Domain:
 
     def simplify(self):
         #does not change anything in any of the examples
-        #isl seems to do this naturally 
+        #isl seems to do this naturally
         islset = self._toislset(self.polyhedra, self.symbols)
         islset = libisl.isl_set_remove_redundancies(islset)
         return self._fromislset(islset, self.symbols)
@@ -152,18 +152,21 @@ class Domain:
         islbset = libisl.isl_set_polyhedral_hull(islset)
         return Polyhedron._fromislbasicset(islbset, self.symbols)
 
-    def drop_dims(self, dims):
-        # use to remove certain variables use isl_set_drop_constraints_involving_dims instead?
-        from .polyhedra import Polyhedron       
-        dims = list(dims)
-        symbols = list(self.symbols)
+    def project_out(self, dims):
+        # use to remove certain variables
         islset = self._toislset(self.polyhedra, self.symbols)
-        for dim in dims:
-            if dim in symbols:
-                num = symbols.index(dim)
-                islbset = libisl.isl_set_drop_constraints_involving_dims(islset, libisl.isl_dim_set, num, 1)
-        return Polyhedron._fromislset(islbset, self.symbols)
-    
+        n = 0
+        for index, symbol in reversed(list(enumerate(self.symbols))):
+            if symbol in dims:
+                n += 1
+            elif n > 0:
+                islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, index + 1, n)
+                n = 0
+        if n > 0:
+            islset = libisl.isl_set_project_out(islset, libisl.isl_dim_set, 0, n)
+        dims = [symbol for symbol in self.symbols if symbol not in dims]
+        return Domain._fromislset(islset, dims)
+
     def sample(self):
         from .polyhedra import Polyhedron
         islset = self._toislset(self.polyhedra, self.symbols)
@@ -218,7 +221,62 @@ class Domain:
         islset = self._toislset(self.polyhedra, self.symbols)
         islset = libisl.isl_set_lexmax(islset)
         return self._fromislset(islset, self.symbols)
-
+    
+    def num_parameters(self):
+        #could be useful with large, complicated polyhedrons
+        islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
+        num = libisl.isl_basic_set_dim(islbset, libisl.isl_dim_set)
+        return num
+    
+    def involves_dims(self, dims):
+        #could be useful with large, complicated polyhedrons
+        islset = self._toislset(self.polyhedra, self.symbols)
+        dims = sorted(dims)
+        symbols = sorted(list(self.symbols))
+        n = 0
+        if len(dims)>0:
+            for dim in dims:
+                if dim in symbols:
+                    first = symbols.index(dims[0])
+                    n +=1  
+                else:
+                    first = 0
+        else: 
+            return False            
+        value = bool(libisl.isl_set_involves_dims(islset, libisl.isl_dim_set, first, n))
+        libisl.isl_set_free(islset)
+        return value
+    
+    def vertices(self):
+        if self.isbounded():
+            islbset = self._toislbasicset(self.equalities, self.inequalities, self.symbols)
+            vertices = libisl.isl_basic_set_compute_vertices(islbset);
+            vertexes = islhelper.isl_vertices_vertices(vertices)
+            #vertex = libisl.isl_vertices_get_n_vertices(vertices)
+            for verts in vertexes:
+                expr = libisl.isl_vertex_get_expr(verts);
+                this = islhelper.isl_set_to_str(expr)
+                print(this)
+        else:
+            raise TypeError('set must be bounded')
+        return string
+
+    def points(self):
+        bounds = {}
+        coordinates = []
+        symbols = self.symbols
+        if self.isbounded():
+            islset = self._toislset(self.polyhedra, self.symbols)
+            points = islhelper.isl_set_points(islset)
+            for sym in symbols:
+                for point in points:
+                    coordinate = libisl.isl_point_get_coordinate_val(point, libisl.isl_dim_set, symbols.index(sym))
+                    coordinate = islhelper.isl_val_to_int(coordinate)
+                    coordinates.append(coordinate)
+        else:
+            raise TypeError('set must be bounded')
+        return coordinates
+    
     @classmethod
     def _fromislset(cls, islset, symbols):
         from .polyhedra import Polyhedron
@@ -332,10 +390,26 @@ class Domain:
 
     @classmethod
     def fromsympy(cls, expr):
-        raise NotImplementedError
+        import sympy
+        from .polyhedra import Lt, Le, Eq, Ne, Ge, Gt
+        funcmap = {
+            sympy.And: And, sympy.Or: Or, sympy.Not: Not,
+            sympy.Lt: Lt, sympy.Le: Le,
+            sympy.Eq: Eq, sympy.Ne: Ne,
+            sympy.Ge: Ge, sympy.Gt: Gt,
+        }
+        if expr.func in funcmap:
+            args = [Domain.fromsympy(arg) for arg in expr.args]
+            return funcmap[expr.func](*args)
+        elif isinstance(expr, sympy.Expr):
+            return Expression.fromsympy(expr)
+        raise ValueError('non-domain expression: {!r}'.format(expr))
 
     def tosympy(self):
-        raise NotImplementedError
+        import sympy
+        polyhedra = [polyhedron.tosympy() for polyhedron in polyhedra]
+        return sympy.Or(*polyhedra)
+
 
 def And(*domains):
     if len(domains) == 0: