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58 lines
1.7 KiB
58 lines
1.7 KiB
const { Kind, GraphQLScalarType } = require('graphql')
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function ensureObject (value) {
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if (typeof value !== 'object' || value === null || Array.isArray(value)) {
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throw new TypeError(`JSONObject cannot represent non-object value: ${value}`)
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}
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return value
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}
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function parseLiteral (typeName, ast, variables) {
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switch (ast.kind) {
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case Kind.STRING:
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case Kind.BOOLEAN:
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return ast.value
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case Kind.INT:
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case Kind.FLOAT:
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return parseFloat(ast.value)
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case Kind.OBJECT:
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return parseObject(typeName, ast, variables)
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case Kind.LIST:
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return ast.values.map((n) => parseLiteral(typeName, n, variables))
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case Kind.NULL:
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return null
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case Kind.VARIABLE:
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return variables ? variables[ast.name.value] : undefined
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default:
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throw new TypeError(`${typeName} cannot represent value: ${ast}`)
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}
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}
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function parseObject (typeName, ast, variables) {
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const value = Object.create(null)
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ast.fields.forEach((field) => {
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// eslint-disable-next-line no-use-before-define
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value[field.name.value] = parseLiteral(typeName, field.value, variables)
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})
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return value
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}
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module.exports = new GraphQLScalarType({
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name: 'JSON',
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description:
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'The `JSON` scalar type represents JSON objects as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).',
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specifiedByUrl:
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'http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf',
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serialize: ensureObject,
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parseValue: ensureObject,
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parseLiteral: (ast, variables) => {
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if (ast.kind !== Kind.OBJECT) {
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throw new TypeError(`JSONObject cannot represent non-object value: ${ast}`)
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}
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return parseObject('JSONObject', ast, variables)
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}
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})
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