chore: import upstream snapshot with attribution

2026-07-13 12:32:53 +08:00
commit 2a16f2f53b
247 changed files with 69150 additions and 0 deletions
@@ -0,0 +1,46 @@
+import fractions
+import os
+
+
+#----------------------------------------------------------------------------#
+# Support GMPY for high-speed large integer arithmetic.                      #
+#                                                                            #
+# To allow an external module to handle arithmetic, we need to make sure     #
+# that all high-precision variables are declared of the correct type. MPZ    #
+# is the constructor for the high-precision type. It defaults to Python's    #
+# long type but can be assinged another type, typically gmpy.mpz.            #
+#                                                                            #
+# MPZ must be used for the mantissa component of an mpf and must be used     #
+# for internal fixed-point operations.                                       #
+#                                                                            #
+# Side-effects:                                                              #
+# * "is" cannot be used to test for special values.  Must use "==".          #
+#----------------------------------------------------------------------------#
+
+gmpy = None
+BACKEND = 'python'
+MPZ = int
+MPQ = fractions.Fraction
+
+if 'MPMATH_NOGMPY' not in os.environ:
+    try:
+        import gmpy2 as gmpy
+        BACKEND = 'gmpy'
+        MPQ = gmpy.mpq
+    except ImportError:
+        try:
+            import gmp as gmpy
+            BACKEND = 'gmp'
+        except ImportError:
+            pass
+
+    if gmpy:
+        MPZ = gmpy.mpz
+
+MPZ_ZERO = MPZ(0)
+MPZ_ONE = MPZ(1)
+MPZ_TWO = MPZ(2)
+MPZ_THREE = MPZ(3)
+MPZ_FIVE = MPZ(5)
+
+int_types = (int,) if BACKEND == 'python' else (int, MPZ)