@platformos/pos-cli/gui/graphql/node_modules/graphiql/esm/utility/getQueryFacts.js

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/**
 *  Copyright (c) 2019 GraphQL Contributors.
 *
 *  This source code is licensed under the MIT license found in the
 *  LICENSE file in the root directory of this source tree.
 */
import { parse, typeFromAST } from 'graphql';
/**
 * Provided previous "queryFacts", a GraphQL schema, and a query document
 * string, return a set of facts about that query useful for GraphiQL features.
 *
 * If the query cannot be parsed, returns undefined.
 */

export default function getQueryFacts(schema, documentStr) {
  if (!documentStr) {
    return;
  }

  let documentAST;

  try {
    documentAST = parse(documentStr);
  } catch (e) {
    return;
  }

  const variableToType = schema ? collectVariables(schema, documentAST) : null; // Collect operations by their names.

  const operations = [];
  documentAST.definitions.forEach(def => {
    if (def.kind === 'OperationDefinition') {
      operations.push(def);
    }
  });
  return {
    variableToType,
    operations
  };
}
/**
 * Provided a schema and a document, produces a `variableToType` Object.
 */

export function collectVariables(schema, documentAST) {
  const variableToType = Object.create(null);
  documentAST.definitions.forEach(definition => {
    if (definition.kind === 'OperationDefinition') {
      const variableDefinitions = definition.variableDefinitions;

      if (variableDefinitions) {
        variableDefinitions.forEach(({
          variable,
          type
        }) => {
          const inputType = typeFromAST(schema, type);

          if (inputType) {
            variableToType[variable.name.value] = inputType;
          }
        });
      }
    }
  });
  return variableToType;
}