create-expo-cljs-app/template/node_modules/metro-transform-plugins/src/utils/createInlinePlatformChecks.js

Create a react native application with Expo and Shadow-CLJS!

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *
 * @format
 */
"use strict"; // Type only import. No runtime dependency
// eslint-disable-next-line import/no-extraneous-dependencies

const importMap = new Map([["ReactNative", "react-native"]]);

function createInlinePlatformChecks(t) {
  let requireName =
    arguments.length > 1 && arguments[1] !== undefined
      ? arguments[1]
      : "require";
  const isIdentifier = t.isIdentifier,
    isStringLiteral = t.isStringLiteral,
    isNumericLiteral = t.isNumericLiteral,
    isMemberExpression = t.isMemberExpression,
    isCallExpression = t.isCallExpression;

  const isPlatformNode = (node, scope, isWrappedModule) =>
    isPlatformOS(node, scope, isWrappedModule) ||
    isReactPlatformOS(node, scope, isWrappedModule);

  const isPlatformSelectNode = (node, scope, isWrappedModule) =>
    isPlatformSelect(node, scope, isWrappedModule) ||
    isReactPlatformSelect(node, scope, isWrappedModule);

  const isPlatformOS = (node, scope, isWrappedModule) =>
    isIdentifier(node.property, {
      name: "OS"
    }) &&
    isImportOrGlobal(
      node.object,
      scope,
      [
        {
          name: "Platform"
        }
      ],
      isWrappedModule
    );

  const isReactPlatformOS = (node, scope, isWrappedModule) =>
    isIdentifier(node.property, {
      name: "OS"
    }) &&
    isMemberExpression(node.object) &&
    isIdentifier(node.object.property, {
      name: "Platform"
    }) &&
    isImportOrGlobal(
      node.object.object,
      scope,
      [
        {
          name: "React"
        },
        {
          name: "ReactNative"
        }
      ],
      isWrappedModule
    );

  const isPlatformSelect = (node, scope, isWrappedModule) =>
    isMemberExpression(node.callee) &&
    isIdentifier(node.callee.property, {
      name: "select"
    }) &&
    isImportOrGlobal(
      node.callee.object,
      scope,
      [
        {
          name: "Platform"
        }
      ],
      isWrappedModule
    );

  const isReactPlatformSelect = (node, scope, isWrappedModule) =>
    isMemberExpression(node.callee) &&
    isIdentifier(node.callee.property, {
      name: "select"
    }) &&
    isMemberExpression(node.callee.object) &&
    isIdentifier(node.callee.object.property, {
      name: "Platform"
    }) &&
    isImportOrGlobal(
      node.callee.object.object,
      scope,
      [
        {
          name: "React"
        },
        {
          name: "ReactNative"
        }
      ],
      isWrappedModule
    );

  const isGlobal = binding => !binding;

  const isRequireCall = (node, dependencyId, scope) =>
    isCallExpression(node) &&
    isIdentifier(node.callee, {
      name: requireName
    }) &&
    checkRequireArgs(node.arguments, dependencyId);

  const isImport = (node, scope, patterns) =>
    patterns.some(pattern => {
      const importName = importMap.get(pattern.name) || pattern.name;
      return isRequireCall(node, importName, scope);
    });

  const isImportOrGlobal = (node, scope, patterns, isWrappedModule) => {
    const identifier = patterns.find(pattern => isIdentifier(node, pattern));
    return (
      (!!identifier &&
        isToplevelBinding(
          scope.getBinding(identifier.name),
          isWrappedModule
        )) ||
      isImport(node, scope, patterns)
    );
  };

  const checkRequireArgs = (args, dependencyId) => {
    const pattern = t.stringLiteral(dependencyId);
    return (
      isStringLiteral(args[0], pattern) ||
      (isMemberExpression(args[0]) &&
        isNumericLiteral(args[0].property) &&
        isStringLiteral(args[1], pattern))
    );
  };

  const isToplevelBinding = (binding, isWrappedModule) =>
    isGlobal(binding) ||
    !binding.scope.parent ||
    (isWrappedModule && !binding.scope.parent.parent);

  return {
    isPlatformNode,
    isPlatformSelectNode
  };
}

module.exports = createInlinePlatformChecks;