function getEngines()

in src/plugman/install.js [196:244]
36 lines of code
16 McCabe index (conditional complexity)

function getEngines (pluginInfo, platform, project_dir, plugin_dir) {
    const engines = pluginInfo.getEngines();
    const defaultEngines = require('./util/default-engines')(project_dir);
    const uncheckedEngines = [];
    let cordovaEngineIndex, cordovaPlatformEngineIndex, theName, platformIndex, defaultPlatformIndex;
    // load in known defaults and update when necessary

    engines.forEach(function (engine) {
        theName = engine.name;

        // check to see if the engine is listed as a default engine
        if (defaultEngines[theName]) {
            // make sure engine is for platform we are installing on
            defaultPlatformIndex = defaultEngines[theName].platform.indexOf(platform);
            if (defaultPlatformIndex > -1 || defaultEngines[theName].platform === '*') {
                defaultEngines[theName].minVersion = defaultEngines[theName].minVersion ? defaultEngines[theName].minVersion : engine.version;
                defaultEngines[theName].currentVersion = defaultEngines[theName].currentVersion ? defaultEngines[theName].currentVersion : null;
                defaultEngines[theName].scriptSrc = defaultEngines[theName].scriptSrc ? defaultEngines[theName].scriptSrc : null;
                defaultEngines[theName].name = theName;

                // set the indices so we can pop the cordova engine when needed
                if (theName === 'cordova') cordovaEngineIndex = uncheckedEngines.length;
                if (theName === 'cordova-' + platform) cordovaPlatformEngineIndex = uncheckedEngines.length;

                uncheckedEngines.push(defaultEngines[theName]);
            }
        // check for other engines
        } else {
            if (typeof engine.platform === 'undefined' || typeof engine.scriptSrc === 'undefined') {
                throw new CordovaError('engine.platform or engine.scriptSrc is not defined in custom engine "' +
                    theName + '" from plugin "' + pluginInfo.id + '" for ' + platform);
            }

            platformIndex = engine.platform.indexOf(platform);
            // CB-7183: security check for scriptSrc path escaping outside the plugin
            const scriptSrcPath = path.resolve(plugin_dir, engine.scriptSrc);
            if (scriptSrcPath.indexOf(plugin_dir) !== 0) {
                throw new Error('Security violation: scriptSrc ' + scriptSrcPath + ' is out of plugin dir ' + plugin_dir);
            }
            if (platformIndex > -1 || engine.platform === '*') {
                uncheckedEngines.push({ name: theName, platform: engine.platform, scriptSrc: scriptSrcPath, minVersion: engine.version });
            }
        }
    });

    // make sure we check for platform req's and not just cordova reqs
    if (cordovaEngineIndex && cordovaPlatformEngineIndex) uncheckedEngines.pop(cordovaEngineIndex);
    return uncheckedEngines;
}