Add Python API for RCF module

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/api/python/z3rcf.py

@@ -0,0 +1,114 @@
+############################################
+# Copyright (c) 2013 Microsoft Corporation
+# 
+# Z3 Python interface for Z3 Real Closed Fields
+# that may contain 
+#    - computable transcendentals
+#    - infinitesimals
+#    - algebraic extensions
+#
+# Author: Leonardo de Moura (leonardo)
+############################################
+from z3 import *
+from z3core import *
+from z3printer import *
+from fractions import Fraction
+
+def _to_rcfnum(num, ctx=None):
+    if isinstance(num, RCFNum):
+        return num
+    else:
+        return RCFNum(num, ctx)
+
+def Pi(ctx=None):
+    ctx = z3._get_ctx(ctx)
+    return RCFNum(Z3_rcf_mk_pi(ctx.ref()), ctx)
+
+def E(ctx=None):
+    ctx = z3._get_ctx(ctx)
+    return RCFNum(Z3_rcf_mk_e(ctx.ref()), ctx)
+
+def MkInfinitesimal(name="eps", ctx=None):
+    ctx = z3._get_ctx(ctx)
+    return RCFNum(Z3_rcf_mk_infinitesimal(ctx.ref(), name), ctx)
+
+class RCFNum:
+    def __init__(self, num, ctx=None):
+        # TODO: add support for converting AST numeral values into RCFNum
+        if isinstance(num, RCFNumObj):
+            self.num = num
+            self.ctx = z3._get_ctx(ctx)
+        else:
+            self.ctx = z3._get_ctx(ctx)
+            self.num = Z3_rcf_mk_rational(self.ctx_ref(), str(num))
+        Z3_rcf_inc_ref(self.ctx_ref(), self.num)
+
+    def __del__(self):
+        Z3_rcf_dec_ref(self.ctx_ref(), self.num)
+
+    def ctx_ref(self):
+        return self.ctx.ref()
+                  
+    def __repr__(self):
+        return Z3_rcf_num_to_string(self.ctx_ref(), self.num)
+
+    def __add__(self, other):
+        return RCFNum(Z3_rcf_add(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num), self.ctx)
+
+    def __radd__(self, other):
+        return RCFNum(Z3_rcf_add(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num), self.ctx)
+
+    def __mul__(self, other):
+        return RCFNum(Z3_rcf_mul(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num), self.ctx)
+
+    def __rmul__(self, other):
+        return RCFNum(Z3_rcf_mul(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num), self.ctx)
+
+    def __sub__(self, other):
+        return RCFNum(Z3_rcf_sub(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num), self.ctx)
+
+    def __rsub__(self, other):
+        return RCFNum(Z3_rcf_sub(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num), self.ctx)
+
+    def __div__(self, other):
+        return RCFNum(Z3_rcf_div(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num), self.ctx)
+
+    def __rdiv__(self, other):
+        return RCFNum(Z3_rcf_div(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num), self.ctx)
+
+    def __neg__(self):
+        return self.__rsub__(0)
+
+    def decimal(self, prec=5):
+        return Z3_rcf_num_to_decimal_string(self.ctx_ref(), self.num, prec)
+    
+    def __lt__(self, other):
+        return Z3_rcf_lt(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+
+    def __rlt__(self, other):
+        return Z3_rcf_lt(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num)
+
+    def __gt__(self, other):
+        return Z3_rcf_gt(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+
+    def __rgt__(self, other):
+        return Z3_rcf_gt(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num)
+
+    def __le__(self, other):
+        return Z3_rcf_le(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+
+    def __rle__(self, other):
+        return Z3_rcf_le(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num)
+
+    def __ge__(self, other):
+        return Z3_rcf_ge(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+
+    def __rge__(self, other):
+        return Z3_rcf_ge(self.ctx_ref(), _to_rcfnum(other, self.ctx).num, self.num)
+
+    def __eq__(self, other):
+        return Z3_rcf_eq(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+
+    def __ne__(self, other):
+        return Z3_rcf_neq(self.ctx_ref(), self.num, _to_rcfnum(other, self.ctx).num)
+