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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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+import { Kind } from "../language/kinds.mjs";
+import { visit } from "../language/visitor.mjs";
+/**
+ * separateOperations accepts a single AST document which may contain many
+ * operations and fragments and returns a collection of AST documents each of
+ * which contains a single operation as well the fragment definitions it
+ * refers to.
+ */
+
+export function separateOperations(documentAST) {
+ var operations = [];
+ var depGraph = Object.create(null); // Populate metadata and build a dependency graph.
+
+ for (var _i2 = 0, _documentAST$definiti2 = documentAST.definitions; _i2 < _documentAST$definiti2.length; _i2++) {
+ var definitionNode = _documentAST$definiti2[_i2];
+
+ switch (definitionNode.kind) {
+ case Kind.OPERATION_DEFINITION:
+ operations.push(definitionNode);
+ break;
+
+ case Kind.FRAGMENT_DEFINITION:
+ depGraph[definitionNode.name.value] = collectDependencies(definitionNode.selectionSet);
+ break;
+ }
+ } // For each operation, produce a new synthesized AST which includes only what
+ // is necessary for completing that operation.
+
+
+ var separatedDocumentASTs = Object.create(null);
+
+ var _loop = function _loop(_i4) {
+ var operation = operations[_i4];
+ var dependencies = new Set();
+
+ for (var _i6 = 0, _collectDependencies2 = collectDependencies(operation.selectionSet); _i6 < _collectDependencies2.length; _i6++) {
+ var fragmentName = _collectDependencies2[_i6];
+ collectTransitiveDependencies(dependencies, depGraph, fragmentName);
+ } // Provides the empty string for anonymous operations.
+
+
+ var operationName = operation.name ? operation.name.value : ''; // The list of definition nodes to be included for this operation, sorted
+ // to retain the same order as the original document.
+
+ separatedDocumentASTs[operationName] = {
+ kind: Kind.DOCUMENT,
+ definitions: documentAST.definitions.filter(function (node) {
+ return node === operation || node.kind === Kind.FRAGMENT_DEFINITION && dependencies.has(node.name.value);
+ })
+ };
+ };
+
+ for (var _i4 = 0; _i4 < operations.length; _i4++) {
+ _loop(_i4);
+ }
+
+ return separatedDocumentASTs;
+}
+
+// From a dependency graph, collects a list of transitive dependencies by
+// recursing through a dependency graph.
+function collectTransitiveDependencies(collected, depGraph, fromName) {
+ if (!collected.has(fromName)) {
+ collected.add(fromName);
+ var immediateDeps = depGraph[fromName];
+
+ if (immediateDeps !== undefined) {
+ for (var _i8 = 0; _i8 < immediateDeps.length; _i8++) {
+ var toName = immediateDeps[_i8];
+ collectTransitiveDependencies(collected, depGraph, toName);
+ }
+ }
+ }
+}
+
+function collectDependencies(selectionSet) {
+ var dependencies = [];
+ visit(selectionSet, {
+ FragmentSpread: function FragmentSpread(node) {
+ dependencies.push(node.name.value);
+ }
+ });
+ return dependencies;
+}