/
collectFields.ts
159 lines (150 loc) · 4.2 KB
/
collectFields.ts
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import type { ObjMap } from '../jsutils/ObjMap';
import type {
SelectionSetNode,
FieldNode,
FragmentSpreadNode,
InlineFragmentNode,
FragmentDefinitionNode,
} from '../language/ast';
import { Kind } from '../language/kinds';
import type { GraphQLSchema } from '../type/schema';
import type { GraphQLObjectType } from '../type/definition';
import {
GraphQLIncludeDirective,
GraphQLSkipDirective,
} from '../type/directives';
import { isAbstractType } from '../type/definition';
import { typeFromAST } from '../utilities/typeFromAST';
import { getDirectiveValues } from './values';
/**
* Given a selectionSet, adds all of the fields in that selection to
* the passed in map of fields, and returns it at the end.
*
* CollectFields requires the "runtime type" of an object. For a field which
* returns an Interface or Union type, the "runtime type" will be the actual
* Object type returned by that field.
*
* @internal
*/
export function collectFields(
schema: GraphQLSchema,
fragments: ObjMap<FragmentDefinitionNode>,
variableValues: { [variable: string]: unknown },
runtimeType: GraphQLObjectType,
selectionSet: SelectionSetNode,
fields: Map<string, Array<FieldNode>>,
visitedFragmentNames: Set<string>,
): Map<string, ReadonlyArray<FieldNode>> {
for (const selection of selectionSet.selections) {
switch (selection.kind) {
case Kind.FIELD: {
if (!shouldIncludeNode(variableValues, selection)) {
continue;
}
const name = getFieldEntryKey(selection);
const fieldList = fields.get(name);
if (fieldList !== undefined) {
fieldList.push(selection);
} else {
fields.set(name, [selection]);
}
break;
}
case Kind.INLINE_FRAGMENT: {
if (
!shouldIncludeNode(variableValues, selection) ||
!doesFragmentConditionMatch(schema, selection, runtimeType)
) {
continue;
}
collectFields(
schema,
fragments,
variableValues,
runtimeType,
selection.selectionSet,
fields,
visitedFragmentNames,
);
break;
}
case Kind.FRAGMENT_SPREAD: {
const fragName = selection.name.value;
if (
visitedFragmentNames.has(fragName) ||
!shouldIncludeNode(variableValues, selection)
) {
continue;
}
visitedFragmentNames.add(fragName);
const fragment = fragments[fragName];
if (
!fragment ||
!doesFragmentConditionMatch(schema, fragment, runtimeType)
) {
continue;
}
collectFields(
schema,
fragments,
variableValues,
runtimeType,
fragment.selectionSet,
fields,
visitedFragmentNames,
);
break;
}
}
}
return fields;
}
/**
* Determines if a field should be included based on the `@include` and `@skip`
* directives, where `@skip` has higher precedence than `@include`.
*/
function shouldIncludeNode(
variableValues: { [variable: string]: unknown },
node: FragmentSpreadNode | FieldNode | InlineFragmentNode,
): boolean {
const skip = getDirectiveValues(GraphQLSkipDirective, node, variableValues);
if (skip?.if === true) {
return false;
}
const include = getDirectiveValues(
GraphQLIncludeDirective,
node,
variableValues,
);
if (include?.if === false) {
return false;
}
return true;
}
/**
* Determines if a fragment is applicable to the given type.
*/
function doesFragmentConditionMatch(
schema: GraphQLSchema,
fragment: FragmentDefinitionNode | InlineFragmentNode,
type: GraphQLObjectType,
): boolean {
const typeConditionNode = fragment.typeCondition;
if (!typeConditionNode) {
return true;
}
const conditionalType = typeFromAST(schema, typeConditionNode);
if (conditionalType === type) {
return true;
}
if (isAbstractType(conditionalType)) {
return schema.isSubType(conditionalType, type);
}
return false;
}
/**
* Implements the logic to compute the key of a given field's entry
*/
function getFieldEntryKey(node: FieldNode): string {
return node.alias ? node.alias.value : node.name.value;
}