graphql/utilities/astFromValue.mjs

import { inspect } from '../jsutils/inspect.mjs';
import { invariant } from '../jsutils/invariant.mjs';
import { isIterableObject } from '../jsutils/isIterableObject.mjs';
import { isObjectLike } from '../jsutils/isObjectLike.mjs';
import { Kind } from '../language/kinds.mjs';
import {
  isEnumType,
  isInputObjectType,
  isLeafType,
  isListType,
  isNonNullType,
} from '../type/definition.mjs';
import { GraphQLID } from '../type/scalars.mjs';
/**
 * Produces a GraphQL Value AST given a JavaScript object.
 * Function will match JavaScript/JSON values to GraphQL AST schema format
 * by using suggested GraphQLInputType. For example:
 *
 *     astFromValue("value", GraphQLString)
 *
 * A GraphQL type must be provided, which will be used to interpret different
 * JavaScript values.
 *
 * | JSON Value    | GraphQL Value        |
 * | ------------- | -------------------- |
 * | Object        | Input Object         |
 * | Array         | List                 |
 * | Boolean       | Boolean              |
 * | String        | String / Enum Value  |
 * | Number        | Int / Float          |
 * | Unknown       | Enum Value           |
 * | null          | NullValue            |
 *
 */

export function astFromValue(value, type) {
  if (isNonNullType(type)) {
    const astValue = astFromValue(value, type.ofType);

    if (
      (astValue === null || astValue === void 0 ? void 0 : astValue.kind) ===
      Kind.NULL
    ) {
      return null;
    }

    return astValue;
  } // only explicit null, not undefined, NaN

  if (value === null) {
    return {
      kind: Kind.NULL,
    };
  } // undefined

  if (value === undefined) {
    return null;
  } // Convert JavaScript array to GraphQL list. If the GraphQLType is a list, but
  // the value is not an array, convert the value using the list's item type.

  if (isListType(type)) {
    const itemType = type.ofType;

    if (isIterableObject(value)) {
      const valuesNodes = [];

      for (const item of value) {
        const itemNode = astFromValue(item, itemType);

        if (itemNode != null) {
          valuesNodes.push(itemNode);
        }
      }

      return {
        kind: Kind.LIST,
        values: valuesNodes,
      };
    }

    return astFromValue(value, itemType);
  } // Populate the fields of the input object by creating ASTs from each value
  // in the JavaScript object according to the fields in the input type.

  if (isInputObjectType(type)) {
    if (!isObjectLike(value)) {
      return null;
    }

    const fieldNodes = [];

    for (const field of Object.values(type.getFields())) {
      const fieldValue = astFromValue(value[field.name], field.type);

      if (fieldValue) {
        fieldNodes.push({
          kind: Kind.OBJECT_FIELD,
          name: {
            kind: Kind.NAME,
            value: field.name,
          },
          value: fieldValue,
        });
      }
    }

    return {
      kind: Kind.OBJECT,
      fields: fieldNodes,
    };
  }

  if (isLeafType(type)) {
    // Since value is an internally represented value, it must be serialized
    // to an externally represented value before converting into an AST.
    const serialized = type.serialize(value);

    if (serialized == null) {
      return null;
    } // Others serialize based on their corresponding JavaScript scalar types.

    if (typeof serialized === 'boolean') {
      return {
        kind: Kind.BOOLEAN,
        value: serialized,
      };
    } // JavaScript numbers can be Int or Float values.

    if (typeof serialized === 'number' && Number.isFinite(serialized)) {
      const stringNum = String(serialized);
      return integerStringRegExp.test(stringNum)
        ? {
            kind: Kind.INT,
            value: stringNum,
          }
        : {
            kind: Kind.FLOAT,
            value: stringNum,
          };
    }

    if (typeof serialized === 'string') {
      // Enum types use Enum literals.
      if (isEnumType(type)) {
        return {
          kind: Kind.ENUM,
          value: serialized,
        };
      } // ID types can use Int literals.

      if (type === GraphQLID && integerStringRegExp.test(serialized)) {
        return {
          kind: Kind.INT,
          value: serialized,
        };
      }

      return {
        kind: Kind.STRING,
        value: serialized,
      };
    }

    throw new TypeError(`Cannot convert value to AST: ${inspect(serialized)}.`);
  }
  /* c8 ignore next 3 */
  // Not reachable, all possible types have been considered.

  false || invariant(false, 'Unexpected input type: ' + inspect(type));
}
/**
 * IntValue:
 *   - NegativeSign? 0
 *   - NegativeSign? NonZeroDigit ( Digit+ )?
 */

const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;