Spaces:
Running
Running
File size: 5,313 Bytes
ba2f5d6 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 |
from ..utils import SchemaBase
class DatumType(object):
"""An object to assist in building Vega-Lite Expressions"""
def __repr__(self):
return "datum"
def __getattr__(self, attr):
if attr.startswith("__") and attr.endswith("__"):
raise AttributeError(attr)
return GetAttrExpression("datum", attr)
def __getitem__(self, attr):
return GetItemExpression("datum", attr)
def __call__(self, datum, **kwargs):
"""Specify a datum for use in an encoding"""
return dict(datum=datum, **kwargs)
datum = DatumType()
def _js_repr(val):
"""Return a javascript-safe string representation of val"""
if val is True:
return "true"
elif val is False:
return "false"
elif val is None:
return "null"
else:
return repr(val)
class Expression(SchemaBase):
"""Expression
Base object for enabling build-up of Javascript expressions using
a Python syntax. Calling ``repr(obj)`` will return a Javascript
representation of the object and the operations it encodes.
"""
_schema = {"type": "string"}
def to_dict(self, *args, **kwargs):
return repr(self)
def __setattr__(self, attr, val):
# We don't need the setattr magic defined in SchemaBase
return object.__setattr__(self, attr, val)
def __add__(self, other):
return BinaryExpression("+", self, other)
def __radd__(self, other):
return BinaryExpression("+", other, self)
def __sub__(self, other):
return BinaryExpression("-", self, other)
def __rsub__(self, other):
return BinaryExpression("-", other, self)
def __mul__(self, other):
return BinaryExpression("*", self, other)
def __rmul__(self, other):
return BinaryExpression("*", other, self)
def __truediv__(self, other):
return BinaryExpression("/", self, other)
def __rtruediv__(self, other):
return BinaryExpression("/", other, self)
__div__ = __truediv__
__rdiv__ = __rtruediv__
def __mod__(self, other):
return BinaryExpression("%", self, other)
def __rmod__(self, other):
return BinaryExpression("%", other, self)
def __pow__(self, other):
# "**" Javascript operator is not supported in all browsers
return FunctionExpression("pow", (self, other))
def __rpow__(self, other):
# "**" Javascript operator is not supported in all browsers
return FunctionExpression("pow", (other, self))
def __neg__(self):
return UnaryExpression("-", self)
def __pos__(self):
return UnaryExpression("+", self)
# comparison operators
def __eq__(self, other):
return BinaryExpression("===", self, other)
def __ne__(self, other):
return BinaryExpression("!==", self, other)
def __gt__(self, other):
return BinaryExpression(">", self, other)
def __lt__(self, other):
return BinaryExpression("<", self, other)
def __ge__(self, other):
return BinaryExpression(">=", self, other)
def __le__(self, other):
return BinaryExpression("<=", self, other)
def __abs__(self):
return FunctionExpression("abs", (self,))
# logical operators
def __and__(self, other):
return BinaryExpression("&&", self, other)
def __rand__(self, other):
return BinaryExpression("&&", other, self)
def __or__(self, other):
return BinaryExpression("||", self, other)
def __ror__(self, other):
return BinaryExpression("||", other, self)
def __invert__(self):
return UnaryExpression("!", self)
# item access
def __getitem__(self, val):
return GetItemExpression(self, val)
class UnaryExpression(Expression):
def __init__(self, op, val):
super(UnaryExpression, self).__init__(op=op, val=val)
def __repr__(self):
return "({op}{val})".format(op=self.op, val=_js_repr(self.val))
class BinaryExpression(Expression):
def __init__(self, op, lhs, rhs):
super(BinaryExpression, self).__init__(op=op, lhs=lhs, rhs=rhs)
def __repr__(self):
return "({lhs} {op} {rhs})".format(
op=self.op, lhs=_js_repr(self.lhs), rhs=_js_repr(self.rhs)
)
class FunctionExpression(Expression):
def __init__(self, name, args):
super(FunctionExpression, self).__init__(name=name, args=args)
def __repr__(self):
args = ",".join(_js_repr(arg) for arg in self.args)
return "{name}({args})".format(name=self.name, args=args)
class ConstExpression(Expression):
def __init__(self, name, doc):
self.__doc__ = """{}: {}""".format(name, doc)
super(ConstExpression, self).__init__(name=name, doc=doc)
def __repr__(self):
return str(self.name)
class GetAttrExpression(Expression):
def __init__(self, group, name):
super(GetAttrExpression, self).__init__(group=group, name=name)
def __repr__(self):
return "{}.{}".format(self.group, self.name)
class GetItemExpression(Expression):
def __init__(self, group, name):
super(GetItemExpression, self).__init__(group=group, name=name)
def __repr__(self):
return "{}[{!r}]".format(self.group, self.name)
|