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105 lines
3.2 KiB
TypeScript
105 lines
3.2 KiB
TypeScript
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/utilities/typeComparators.js
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import { isInterfaceType, isObjectType, isListType, isNonNullType, isAbstractType } from '../type/definition.js';
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/**
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* Provided two types, return true if the types are equal (invariant).
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*/
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export function isEqualType(typeA, typeB) {
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// Equivalent types are equal.
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if (typeA === typeB) {
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return true;
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} // If either type is non-null, the other must also be non-null.
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if (isNonNullType(typeA) && isNonNullType(typeB)) {
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return isEqualType(typeA.ofType, typeB.ofType);
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} // If either type is a list, the other must also be a list.
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if (isListType(typeA) && isListType(typeB)) {
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return isEqualType(typeA.ofType, typeB.ofType);
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} // Otherwise the types are not equal.
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return false;
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}
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/**
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* Provided a type and a super type, return true if the first type is either
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* equal or a subset of the second super type (covariant).
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*/
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export function isTypeSubTypeOf(schema, maybeSubType, superType) {
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// Equivalent type is a valid subtype
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if (maybeSubType === superType) {
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return true;
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} // If superType is non-null, maybeSubType must also be non-null.
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if (isNonNullType(superType)) {
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if (isNonNullType(maybeSubType)) {
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return isTypeSubTypeOf(schema, maybeSubType.ofType, superType.ofType);
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}
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return false;
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}
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if (isNonNullType(maybeSubType)) {
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// If superType is nullable, maybeSubType may be non-null or nullable.
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return isTypeSubTypeOf(schema, maybeSubType.ofType, superType);
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} // If superType type is a list, maybeSubType type must also be a list.
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if (isListType(superType)) {
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if (isListType(maybeSubType)) {
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return isTypeSubTypeOf(schema, maybeSubType.ofType, superType.ofType);
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}
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return false;
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}
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if (isListType(maybeSubType)) {
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// If superType is not a list, maybeSubType must also be not a list.
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return false;
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} // If superType type is an abstract type, check if it is super type of maybeSubType.
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// Otherwise, the child type is not a valid subtype of the parent type.
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return isAbstractType(superType) && (isInterfaceType(maybeSubType) || isObjectType(maybeSubType)) && schema.isSubType(superType, maybeSubType);
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}
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/**
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* Provided two composite types, determine if they "overlap". Two composite
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* types overlap when the Sets of possible concrete types for each intersect.
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*
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* This is often used to determine if a fragment of a given type could possibly
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* be visited in a context of another type.
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*
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* This function is commutative.
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*/
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export function doTypesOverlap(schema, typeA, typeB) {
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// Equivalent types overlap
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if (typeA === typeB) {
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return true;
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}
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if (isAbstractType(typeA)) {
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if (isAbstractType(typeB)) {
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// If both types are abstract, then determine if there is any intersection
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// between possible concrete types of each.
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return schema.getPossibleTypes(typeA).some(type => schema.isSubType(typeB, type));
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} // Determine if the latter type is a possible concrete type of the former.
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return schema.isSubType(typeA, typeB);
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}
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if (isAbstractType(typeB)) {
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// Determine if the former type is a possible concrete type of the latter.
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return schema.isSubType(typeB, typeA);
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} // Otherwise the types do not overlap.
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return false;
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} |