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177 lines
4.6 KiB
177 lines
4.6 KiB
import { inspect } from '../jsutils/inspect.mjs'; |
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import { invariant } from '../jsutils/invariant.mjs'; |
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import { isIterableObject } from '../jsutils/isIterableObject.mjs'; |
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import { isObjectLike } from '../jsutils/isObjectLike.mjs'; |
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import { Kind } from '../language/kinds.mjs'; |
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import { |
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isEnumType, |
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isInputObjectType, |
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isLeafType, |
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isListType, |
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isNonNullType, |
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} from '../type/definition.mjs'; |
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import { GraphQLID } from '../type/scalars.mjs'; |
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/** |
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* Produces a GraphQL Value AST given a JavaScript object. |
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* Function will match JavaScript/JSON values to GraphQL AST schema format |
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* by using suggested GraphQLInputType. For example: |
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* |
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* astFromValue("value", GraphQLString) |
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* |
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* A GraphQL type must be provided, which will be used to interpret different |
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* JavaScript values. |
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* |
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* | JSON Value | GraphQL Value | |
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* | ------------- | -------------------- | |
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* | Object | Input Object | |
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* | Array | List | |
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* | Boolean | Boolean | |
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* | String | String / Enum Value | |
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* | Number | Int / Float | |
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* | Unknown | Enum Value | |
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* | null | NullValue | |
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* |
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*/ |
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export function astFromValue(value, type) { |
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if (isNonNullType(type)) { |
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const astValue = astFromValue(value, type.ofType); |
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if ( |
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(astValue === null || astValue === void 0 ? void 0 : astValue.kind) === |
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Kind.NULL |
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) { |
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return null; |
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} |
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return astValue; |
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} // only explicit null, not undefined, NaN |
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if (value === null) { |
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return { |
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kind: Kind.NULL, |
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}; |
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} // undefined |
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if (value === undefined) { |
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return null; |
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} // Convert JavaScript array to GraphQL list. If the GraphQLType is a list, but |
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// the value is not an array, convert the value using the list's item type. |
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if (isListType(type)) { |
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const itemType = type.ofType; |
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if (isIterableObject(value)) { |
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const valuesNodes = []; |
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for (const item of value) { |
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const itemNode = astFromValue(item, itemType); |
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if (itemNode != null) { |
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valuesNodes.push(itemNode); |
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} |
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} |
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return { |
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kind: Kind.LIST, |
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values: valuesNodes, |
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}; |
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} |
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return astFromValue(value, itemType); |
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} // Populate the fields of the input object by creating ASTs from each value |
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// in the JavaScript object according to the fields in the input type. |
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if (isInputObjectType(type)) { |
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if (!isObjectLike(value)) { |
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return null; |
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} |
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const fieldNodes = []; |
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for (const field of Object.values(type.getFields())) { |
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const fieldValue = astFromValue(value[field.name], field.type); |
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if (fieldValue) { |
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fieldNodes.push({ |
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kind: Kind.OBJECT_FIELD, |
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name: { |
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kind: Kind.NAME, |
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value: field.name, |
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}, |
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value: fieldValue, |
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}); |
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} |
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} |
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return { |
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kind: Kind.OBJECT, |
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fields: fieldNodes, |
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}; |
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} |
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if (isLeafType(type)) { |
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// Since value is an internally represented value, it must be serialized |
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// to an externally represented value before converting into an AST. |
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const serialized = type.serialize(value); |
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if (serialized == null) { |
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return null; |
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} // Others serialize based on their corresponding JavaScript scalar types. |
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if (typeof serialized === 'boolean') { |
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return { |
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kind: Kind.BOOLEAN, |
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value: serialized, |
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}; |
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} // JavaScript numbers can be Int or Float values. |
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if (typeof serialized === 'number' && Number.isFinite(serialized)) { |
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const stringNum = String(serialized); |
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return integerStringRegExp.test(stringNum) |
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? { |
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kind: Kind.INT, |
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value: stringNum, |
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} |
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: { |
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kind: Kind.FLOAT, |
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value: stringNum, |
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}; |
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} |
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if (typeof serialized === 'string') { |
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// Enum types use Enum literals. |
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if (isEnumType(type)) { |
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return { |
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kind: Kind.ENUM, |
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value: serialized, |
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}; |
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} // ID types can use Int literals. |
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if (type === GraphQLID && integerStringRegExp.test(serialized)) { |
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return { |
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kind: Kind.INT, |
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value: serialized, |
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}; |
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} |
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return { |
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kind: Kind.STRING, |
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value: serialized, |
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}; |
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} |
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throw new TypeError(`Cannot convert value to AST: ${inspect(serialized)}.`); |
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} |
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/* c8 ignore next 3 */ |
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// Not reachable, all possible types have been considered. |
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false || invariant(false, 'Unexpected input type: ' + inspect(type)); |
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} |
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/** |
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* IntValue: |
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* - NegativeSign? 0 |
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* - NegativeSign? NonZeroDigit ( Digit+ )? |
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*/ |
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const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;
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