Initial import from Docker volume

tools/decimal_.py

@@ -0,0 +1,47 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from io import BytesIO
+from tokenize import NAME, NUMBER, OP, STRING, tokenize, untokenize
+
+# code snippet taken from http://docs.python.org/library/tokenize.html
+
+
+def decistmt(s):
+    """Substitute Decimals for floats or integers in a string of statements.
+
+    >>> from decimal import Decimal
+    >>> s = 'print(+21.3e-5*-.1234/81.7)'
+    >>> decistmt(s)
+    "print (+Decimal ('21.3e-5')*-Decimal ('.1234')/Decimal ('81.7'))"
+
+    The format of the exponent is inherited from the platform C library.
+    Known cases are "e-007" (Windows) and "e-07" (not Windows).  Since
+    we're only showing 12 digits, and the 13th isn't close to 5, the
+    rest of the output should be platform-independent.
+
+    >>> exec(s) #doctest: +ELLIPSIS
+    -3.217160342717258e-0...7
+
+    Output from calculations with Decimal should be identical across all
+    platforms.
+
+    >>> exec(decistmt(s))
+    -3.217160342717258261933904529E-7
+    >>> decistmt('0')
+    "Decimal ('0')"
+    >>> decistmt('1.23')
+    "Decimal ('1.23')"
+    """
+    result = []
+    g = tokenize(BytesIO(s.encode('utf-8')).readline)  # tokenize the string
+    for toknum, tokval, _, _, _ in g:
+        if toknum == NUMBER:  # replace NUMBER tokens
+            result.extend([
+                (NAME, 'Decimal'),
+                (OP, '('),
+                (STRING, repr(tokval)),
+                (OP, ')')
+            ])
+        else:
+            result.append((toknum, tokval))
+    return untokenize(result).decode('utf-8')