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from math import isnan, nan
from typing import Any, Dict, Optional
from graphql.language import parse_value, ValueNode
from graphql.pyutils import Undefined
from graphql.type import (
GraphQLBoolean,
GraphQLEnumType,
GraphQLFloat,
GraphQLID,
GraphQLInputField,
GraphQLInputObjectType,
GraphQLInputType,
GraphQLInt,
GraphQLList,
GraphQLNonNull,
GraphQLScalarType,
GraphQLString,
)
from graphql.utilities import value_from_ast
def describe_value_from_ast():
def _value_from(
value_text: str,
type_: GraphQLInputType,
variables: Optional[Dict[str, Any]] = None,
):
ast = parse_value(value_text)
return value_from_ast(ast, type_, variables)
def rejects_empty_input():
# noinspection PyTypeChecker
assert value_from_ast(None, GraphQLBoolean) is Undefined
def converts_according_to_input_coercion_rules():
assert _value_from("true", GraphQLBoolean) is True
assert _value_from("false", GraphQLBoolean) is False
assert _value_from("123", GraphQLInt) == 123
assert _value_from("123", GraphQLFloat) == 123
assert _value_from("123.456", GraphQLFloat) == 123.456
assert _value_from('"abc123"', GraphQLString) == "abc123"
assert _value_from("123456", GraphQLID) == "123456"
assert _value_from('"123456"', GraphQLID) == "123456"
def does_not_convert_when_input_coercion_rules_reject_a_value():
assert _value_from("123", GraphQLBoolean) is Undefined
assert _value_from("123.456", GraphQLInt) is Undefined
assert _value_from("true", GraphQLInt) is Undefined
assert _value_from('"123"', GraphQLInt) is Undefined
assert _value_from('"123"', GraphQLFloat) is Undefined
assert _value_from("123", GraphQLString) is Undefined
assert _value_from("true", GraphQLString) is Undefined
assert _value_from("123.456", GraphQLID) is Undefined
def convert_using_parse_literal_from_a_custom_scalar_type():
def pass_through_parse_literal(node, _vars=None):
assert node.kind == "string_value"
return node.value
pass_through_scalar = GraphQLScalarType(
"PassThroughScalar",
parse_literal=pass_through_parse_literal,
parse_value=lambda value: value, # pragma: no cover
)
assert _value_from('"value"', pass_through_scalar) == "value"
def throw_parse_literal(_node: ValueNode, _vars=None):
raise RuntimeError("Test")
throw_scalar = GraphQLScalarType(
"ThrowScalar",
parse_literal=throw_parse_literal,
parse_value=lambda value: value, # pragma: no cover
)
assert _value_from("value", throw_scalar) is Undefined
def undefined_parse_literal(_node: ValueNode, _vars=None):
return Undefined
return_undefined_scalar = GraphQLScalarType(
"ReturnUndefinedScalar",
parse_literal=undefined_parse_literal,
parse_value=lambda value: value, # pragma: no cover
)
assert _value_from("value", return_undefined_scalar) is Undefined
def converts_enum_values_according_to_input_coercion_rules():
test_enum = GraphQLEnumType(
"TestColor",
{
"RED": 1,
"GREEN": 2,
"BLUE": 3,
"NULL": None,
"NAN": nan,
"NO_CUSTOM_VALUE": Undefined,
},
)
assert _value_from("RED", test_enum) == 1
assert _value_from("BLUE", test_enum) == 3
assert _value_from("YELLOW", test_enum) is Undefined
assert _value_from("3", test_enum) is Undefined
assert _value_from('"BLUE"', test_enum) is Undefined
assert _value_from("null", test_enum) is None
assert _value_from("NULL", test_enum) is None
assert _value_from("NULL", GraphQLNonNull(test_enum)) is None
assert isnan(_value_from("NAN", test_enum))
assert _value_from("NO_CUSTOM_VALUE", test_enum) is Undefined
# Boolean!
non_null_bool = GraphQLNonNull(GraphQLBoolean)
# [Boolean]
list_of_bool = GraphQLList(GraphQLBoolean)
# [Boolean!]
list_of_non_null_bool = GraphQLList(non_null_bool)
# [Boolean]!
non_null_list_of_bool = GraphQLNonNull(list_of_bool)
# [Boolean!]!
non_null_list_of_non_mull_bool = GraphQLNonNull(list_of_non_null_bool)
def coerces_to_null_unless_non_null():
assert _value_from("null", GraphQLBoolean) is None
assert _value_from("null", non_null_bool) is Undefined
def coerces_lists_of_values():
assert _value_from("true", list_of_bool) == [True]
assert _value_from("123", list_of_bool) is Undefined
assert _value_from("null", list_of_bool) is None
assert _value_from("[true, false]", list_of_bool) == [True, False]
assert _value_from("[true, 123]", list_of_bool) is Undefined
assert _value_from("[true, null]", list_of_bool) == [True, None]
assert _value_from("{ true: true }", list_of_bool) is Undefined
def coerces_non_null_lists_of_values():
assert _value_from("true", non_null_list_of_bool) == [True]
assert _value_from("123", non_null_list_of_bool) is Undefined
assert _value_from("null", non_null_list_of_bool) is Undefined
assert _value_from("[true, false]", non_null_list_of_bool) == [True, False]
assert _value_from("[true, 123]", non_null_list_of_bool) is Undefined
assert _value_from("[true, null]", non_null_list_of_bool) == [True, None]
def coerces_lists_of_non_null_values():
assert _value_from("true", list_of_non_null_bool) == [True]
assert _value_from("123", list_of_non_null_bool) is Undefined
assert _value_from("null", list_of_non_null_bool) is None
assert _value_from("[true, false]", list_of_non_null_bool) == [True, False]
assert _value_from("[true, 123]", list_of_non_null_bool) is Undefined
assert _value_from("[true, null]", list_of_non_null_bool) is Undefined
def coerces_non_null_lists_of_non_null_values():
assert _value_from("true", non_null_list_of_non_mull_bool) == [True]
assert _value_from("123", non_null_list_of_non_mull_bool) is Undefined
assert _value_from("null", non_null_list_of_non_mull_bool) is Undefined
assert _value_from("[true, false]", non_null_list_of_non_mull_bool) == [
True,
False,
]
assert _value_from("[true, 123]", non_null_list_of_non_mull_bool) is Undefined
assert _value_from("[true, null]", non_null_list_of_non_mull_bool) is Undefined
test_input_obj = GraphQLInputObjectType(
"TestInput",
{
"int": GraphQLInputField(GraphQLInt, default_value=42),
"bool": GraphQLInputField(GraphQLBoolean),
"requiredBool": GraphQLInputField(non_null_bool),
},
)
def coerces_input_objects_according_to_input_coercion_rules():
assert _value_from("null", test_input_obj) is None
assert _value_from("[]", test_input_obj) is Undefined
assert _value_from("123", test_input_obj) is Undefined
assert _value_from("{ int: 123, requiredBool: false }", test_input_obj) == {
"int": 123,
"requiredBool": False,
}
assert _value_from("{ bool: true, requiredBool: false }", test_input_obj) == {
"int": 42,
"bool": True,
"requiredBool": False,
}
assert (
_value_from("{ int: true, requiredBool: true }", test_input_obj)
is Undefined
)
assert _value_from("{ requiredBool: null }", test_input_obj) is Undefined
assert _value_from("{ bool: true }", test_input_obj) is Undefined
def accepts_variable_values_assuming_already_coerced():
assert _value_from("$var", GraphQLBoolean, {}) is Undefined
assert _value_from("$var", GraphQLBoolean, {"var": True}) is True
assert _value_from("$var", GraphQLBoolean, {"var": None}) is None
assert _value_from("$var", non_null_bool, {"var": None}) is Undefined
def asserts_variables_are_provided_as_items_in_lists():
assert _value_from("[ $foo ]", list_of_bool, {}) == [None]
assert _value_from("[ $foo ]", list_of_non_null_bool, {}) is Undefined
assert _value_from("[ $foo ]", list_of_non_null_bool, {"foo": True}) == [True]
# Note: variables are expected to have already been coerced, so we
# do not expect the singleton wrapping behavior for variables.
assert _value_from("$foo", list_of_non_null_bool, {"foo": True}) is True
assert _value_from("$foo", list_of_non_null_bool, {"foo": [True]}) == [True]
def omits_input_object_fields_for_unprovided_variables():
assert _value_from(
"{ int: $foo, bool: $foo, requiredBool: true }", test_input_obj, {}
) == {"int": 42, "requiredBool": True}
assert _value_from("{ requiredBool: $foo }", test_input_obj, {}) is Undefined
assert _value_from("{ requiredBool: $foo }", test_input_obj, {"foo": True}) == {
"int": 42,
"requiredBool": True,
}
def transforms_names_using_out_name():
# This is an extension of GraphQL.js.
complex_input_obj = GraphQLInputObjectType(
"Complex",
{
"realPart": GraphQLInputField(GraphQLFloat, out_name="real_part"),
"imagPart": GraphQLInputField(
GraphQLFloat, default_value=0, out_name="imag_part"
),
},
)
assert _value_from("{ realPart: 1 }", complex_input_obj) == {
"real_part": 1,
"imag_part": 0,
}
def transforms_values_with_out_type():
# This is an extension of GraphQL.js.
complex_input_obj = GraphQLInputObjectType(
"Complex",
{
"real": GraphQLInputField(GraphQLFloat),
"imag": GraphQLInputField(GraphQLFloat),
},
out_type=lambda value: complex(value["real"], value["imag"]),
)
assert _value_from("{ real: 1, imag: 2 }", complex_input_obj) == 1 + 2j
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