Source code for py_gql.utilities.untyped_value_from_ast

# -*- coding: utf-8 -*-
from typing import Any, Dict, Optional, Union

from ..exc import UnknownVariable
from ..lang import ast as _ast

[docs]def untyped_value_from_ast( node: Union[_ast.Value, _ast.Variable], variables: Optional[Dict[str, Any]] = None, ) -> Any: """ Convert an ast value node into a valid python value without type validation. Warning: No validation is done with regard to the variable values which are assumed to have been validated before. Args: node: The value node variables: Variables mapping Returns: Extracted value Raises: TypeError: when node is not a value node UnknownVariable: if a variable is required and doesn't exist """ if isinstance(node, _ast.NullValue): return None elif isinstance(node, _ast.IntValue): return int(node.value, 10) elif isinstance(node, _ast.FloatValue): return float(node.value) elif isinstance( node, (_ast.StringValue, _ast.EnumValue, _ast.BooleanValue) ): return node.value elif isinstance(node, _ast.ListValue): return [ untyped_value_from_ast(item, variables=variables) for item in node.values ] elif isinstance(node, _ast.ObjectValue): return { untyped_value_from_ast(f.value, variables=variables) for f in node.fields } elif isinstance(node, _ast.Variable): varname = if not variables or varname not in variables: raise UnknownVariable(varname, [node]) return variables[varname] raise TypeError("Unexpected node %s" % node.__class__)