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node_modules/graphql/utilities/astFromValue.js.flow

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+// @flow strict
+
+import { forEach, isCollection } from 'iterall';
+
+import objectValues from '../polyfills/objectValues';
+
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import isNullish from '../jsutils/isNullish';
+import isInvalid from '../jsutils/isInvalid';
+import isObjectLike from '../jsutils/isObjectLike';
+
+import { Kind } from '../language/kinds';
+import { type ValueNode } from '../language/ast';
+
+import { GraphQLID } from '../type/scalars';
+import {
+  type GraphQLInputType,
+  isLeafType,
+  isEnumType,
+  isInputObjectType,
+  isListType,
+  isNonNullType,
+} from '../type/definition';
+
+/**
+ * Produces a GraphQL Value AST given a JavaScript value.
+ *
+ * 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          |
+ * | Mixed         | Enum Value           |
+ * | null          | NullValue            |
+ *
+ */
+export function astFromValue(value: mixed, type: GraphQLInputType): ?ValueNode {
+  if (isNonNullType(type)) {
+    const astValue = astFromValue(value, type.ofType);
+    if (astValue && astValue.kind === Kind.NULL) {
+      return null;
+    }
+    return astValue;
+  }
+
+  // only explicit null, not undefined, NaN
+  if (value === null) {
+    return { kind: Kind.NULL };
+  }
+
+  // undefined, NaN
+  if (isInvalid(value)) {
+    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 (isCollection(value)) {
+      const valuesNodes = [];
+      forEach((value: any), item => {
+        const itemNode = astFromValue(item, itemType);
+        if (itemNode) {
+          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 objectValues(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 (isNullish(serialized)) {
+      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') {
+      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: ${inspect(serialized)}`);
+  }
+
+  // Not reachable. All possible input types have been considered.
+  invariant(false, 'Unexpected input type: ' + inspect((type: empty)));
+}
+
+/**
+ * IntValue:
+ *   - NegativeSign? 0
+ *   - NegativeSign? NonZeroDigit ( Digit+ )?
+ */
+const integerStringRegExp = /^-?(?:0|[1-9][0-9]*)$/;