Mirror: The spec-compliant minimum of client-side GraphQL.
kitten.sh
1import { TypeNode, ValueNode } from './ast';
2import { Kind } from './kind';
3import { Maybe } from './types';
4
5export function valueFromASTUntyped(
6 node: ValueNode,
7 variables?: Maybe<Record<string, any>>,
8): unknown {
9 switch (node.kind) {
10 case Kind.NULL:
11 return null;
12 case Kind.INT:
13 return parseInt(node.value, 10);
14 case Kind.FLOAT:
15 return parseFloat(node.value);
16 case Kind.STRING:
17 case Kind.ENUM:
18 case Kind.BOOLEAN:
19 return node.value;
20 case Kind.LIST: {
21 const values: unknown[] = [];
22 for (const value of node.values)
23 values.push(valueFromASTUntyped(value, variables));
24 return values;
25 }
26 case Kind.OBJECT: {
27 const obj = Object.create(null);
28 for (const field of node.fields)
29 obj[field.name.value] = valueFromASTUntyped(field.value, variables);
30 return obj;
31 }
32 case Kind.VARIABLE:
33 return variables && variables[node.name.value];
34 }
35}
36
37export function valueFromTypeNode(
38 node: ValueNode,
39 type: TypeNode,
40 variables?: Maybe<Record<string, any>>,
41): unknown {
42 if (node.kind === Kind.VARIABLE) {
43 const variableName = node.name.value;
44 return variables
45 ? valueFromTypeNode(variables[variableName], type, variables)
46 : undefined;
47 } else if (type.kind === Kind.NON_NULL_TYPE) {
48 return node.kind !== Kind.NULL
49 ? valueFromTypeNode(node, type, variables)
50 : undefined
51 } else if (node.kind === Kind.NULL) {
52 return null;
53 } else if (type.kind === Kind.LIST_TYPE) {
54 if (node.kind === Kind.LIST) {
55 const values: unknown[] = [];
56 for (const value of node.values) {
57 const coerced = valueFromTypeNode(value, type.type, variables);
58 if (coerced === undefined) {
59 return undefined;
60 } else {
61 values.push(coerced);
62 }
63 }
64 return values;
65 }
66 } else if (type.kind === Kind.NAMED_TYPE) {
67 switch (type.name.value) {
68 case 'Int':
69 case 'Float':
70 case 'String':
71 case 'Bool':
72 return type.name.value + 'Value' === node.kind
73 ? valueFromASTUntyped(node, variables)
74 : undefined;
75 default:
76 return valueFromASTUntyped(node, variables);
77 }
78 }
79}