Mirror: The spec-compliant minimum of client-side GraphQL.
kitten.sh
1import { TypeNode, ValueNode } from './ast';
2import { Maybe } from './types';
3
4export function valueFromASTUntyped(
5 node: ValueNode,
6 variables?: Maybe<Record<string, any>>
7): unknown {
8 switch (node.kind) {
9 case 'NullValue':
10 return null;
11 case 'IntValue':
12 return parseInt(node.value, 10);
13 case 'FloatValue':
14 return parseFloat(node.value);
15 case 'StringValue':
16 case 'EnumValue':
17 case 'BooleanValue':
18 return node.value;
19 case 'ListValue': {
20 const values: unknown[] = [];
21 for (const value of node.values) values.push(valueFromASTUntyped(value, variables));
22 return values;
23 }
24 case 'ObjectValue': {
25 const obj = Object.create(null);
26 for (const field of node.fields)
27 obj[field.name.value] = valueFromASTUntyped(field.value, variables);
28 return obj;
29 }
30 case 'Variable':
31 return variables && variables[node.name.value];
32 }
33}
34
35export function valueFromTypeNode(
36 node: ValueNode,
37 type: TypeNode,
38 variables?: Maybe<Record<string, any>>
39): unknown {
40 if (node.kind === 'Variable') {
41 const variableName = node.name.value;
42 return variables ? valueFromTypeNode(variables[variableName], type, variables) : undefined;
43 } else if (type.kind === 'NonNullType') {
44 return node.kind !== 'NullValue' ? valueFromTypeNode(node, type, variables) : undefined;
45 } else if (node.kind === 'NullValue') {
46 return null;
47 } else if (type.kind === 'ListType') {
48 if (node.kind === 'ListValue') {
49 const values: unknown[] = [];
50 for (const value of node.values) {
51 const coerced = valueFromTypeNode(value, type.type, variables);
52 if (coerced === undefined) {
53 return undefined;
54 } else {
55 values.push(coerced);
56 }
57 }
58 return values;
59 }
60 } else if (type.kind === 'NamedType') {
61 switch (type.name.value) {
62 case 'Int':
63 case 'Float':
64 case 'String':
65 case 'Bool':
66 return type.name.value + 'Value' === node.kind
67 ? valueFromASTUntyped(node, variables)
68 : undefined;
69 default:
70 return valueFromASTUntyped(node, variables);
71 }
72 }
73}