add

ccxt/static_dependencies/parsimonious/utils.py

@@ -0,0 +1,40 @@
+"""General tools which don't depend on other parts of Parsimonious"""
+
+import ast
+
+
+class StrAndRepr(object):
+    """Mix-in which gives the class the same __repr__ and __str__."""
+
+    def __repr__(self):
+        return self.__str__()
+
+
+def evaluate_string(string):
+    """Piggyback on Python's string support so we can have backslash escaping
+    and niceties like \n, \t, etc. string.decode('string_escape') would have
+    been a lower-level possibility.
+
+    """
+    return ast.literal_eval(string)
+
+
+class Token(StrAndRepr):
+    """A class to represent tokens, for use with TokenGrammars
+
+    You will likely want to subclass this to hold additional information, like
+    the characters that you lexed to create this token. Alternately, feel free
+    to create your own class from scratch. The only contract is that tokens
+    must have a ``type`` attr.
+
+    """
+    __slots__ = ['type']
+
+    def __init__(self, type):
+        self.type = type
+
+    def __str__(self):
+        return u'<Token "%s">' % (self.type,)
+
+    def __eq__(self, other):
+        return self.type == other.type