MDL-43713 behat: improve multi-select support

[moodle.git] / lib / behat / form_field / behat_form_select.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Single select form field class.
 *
 * @package    core_form
 * @category   test
 * @copyright  2012 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

// NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.

require_once(__DIR__  . '/behat_form_field.php');

/**
 * Single select form field.
 *
 * @package    core_form
 * @category   test
 * @copyright  2012 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class behat_form_select extends behat_form_field {

    /**
     * Sets the value(s) of a select element.
     *
     * Seems an easy select, but there are lots of combinations
     * of browsers and operative systems and each one manages the
     * autosubmits and the multiple option selects in a different way.
     *
     * @param string $value plain value or comma separated values if multiple. Commas in values escaped with backslash.
     * @return void
     */
    public function set_value($value) {

        // In some browsers we select an option and it triggers all the
        // autosubmits and works as expected but not in all of them, so we
        // try to catch all the possibilities to make this function work as
        // expected.

        // Get the internal id of the element we are going to click.
        // This kind of internal IDs are only available in the selenium wire
        // protocol, so only available using selenium drivers, phantomjs and family.
        if ($this->running_javascript()) {
            $currentelementid = $this->get_internal_field_id();
        }

        // Is the select multiple?
        $multiple = $this->field->hasAttribute('multiple');

        // By default, assume the passed value is a non-multiple option.
        $options = array(trim($value));

        // Here we select the option(s).
        if ($multiple) {
            // Split and decode values. Comma separated list of values allowed. With valuable commas escaped with backslash.
            $options = preg_replace('/\\\,/', ',',  preg_split('/(?<!\\\),/', $value));
            // This is a multiple select, let's pass the multiple flag after first option.
            $afterfirstoption = false;
            foreach ($options as $option) {
                $this->field->selectOption(trim($option), $afterfirstoption);
                $afterfirstoption = true;
            }
        } else {
            // This is a single select, let's pass the last one specified.
            $this->field->selectOption(end($options));
        }

        // With JS disabled this is enough and we finish here.
        if (!$this->running_javascript()) {
            return;
        }

        // With JS enabled we add more clicks as some selenium
        // drivers requires it to fire JS events.

        // In some browsers the selectOption actions can perform a form submit or reload page
        // so we need to ensure the element is still available to continue interacting
        // with it. We don't wait here.
        $selectxpath = $this->field->getXpath();
        if (!$this->session->getDriver()->find($selectxpath)) {
            return;
        }

        // We also check the selenium internal element id, if it have changed
        // we are dealing with an autosubmit that was already executed, and we don't to
        // execute anything else as the action we wanted was already performed.
        if ($currentelementid != $this->get_internal_field_id()) {
            return;
        }

        // We also check that the option(s) are still there. We neither wait.
        foreach ($options as $option) {
            $valueliteral = $this->session->getSelectorsHandler()->xpathLiteral(trim($option));
            $optionxpath = $selectxpath . "/descendant::option[(./@value=$valueliteral or normalize-space(.)=$valueliteral)]";
            if (!$this->session->getDriver()->find($optionxpath)) {
                return;
            }
        }

        // Wrapped in try & catch as the element may disappear if an AJAX request was submitted.
        try {
            $multiple = $this->field->hasAttribute('multiple');
        } catch (Exception $e) {
            // We do not specify any specific Exception type as there are
            // different exceptions that can be thrown by the driver and
            // we can not control them all, also depending on the selenium
            // version the exception type can change.
            return;
        }

        // Wait for all the possible AJAX requests that have been
        // already triggered by selectOption() to be finished.
        $this->session->wait(behat_base::TIMEOUT * 1000, behat_base::PAGE_READY_JS);

        // Single select sometimes needs an extra click in the option.
        if (!$multiple) {

            // Using the driver direcly because Element methods are messy when dealing
            // with elements inside containers.
            $optionnodes = $this->session->getDriver()->find($optionxpath);
            if ($optionnodes) {
                // Wrapped in a try & catch as we can fall into race conditions
                // and the element may not be there.
                try {
                    current($optionnodes)->click();
                } catch (Exception $e) {
                    // We continue and return as this means that the element is not there or it is not the same.
                    return;
                }
            }

        } else {

            // Wrapped in a try & catch as we can fall into race conditions
            // and the element may not be there.
            try {
                // Multiple ones needs the click in the select.
                $this->field->click();
            } catch (Exception $e) {
                // We continue and return as this means that the element is not there or it is not the same.
                return;
            }

            // We ensure that the option is still there.
            if (!$this->session->getDriver()->find($optionxpath)) {
                return;
            }

            // Wait for all the possible AJAX requests that have been
            // already triggered by selectOption() to be finished.
            $this->session->wait(behat_base::TIMEOUT * 1000, behat_base::PAGE_READY_JS);

            // Wrapped in a try & catch as we can fall into race conditions
            // and the element may not be there.
            try {
                // Repeating the select(s) as some drivers (chrome that I know) are moving
                // to another option after the general select field click above.
                foreach ($options as $option) {
                    $this->field->selectOption(trim($option), true);
                }
            } catch (Exception $e) {
                // We continue and return as this means that the element is not there or it is not the same.
                return;
            }
        }
    }

    /**
     * Returns the text of the currently selected options.
     *
     * @return string Comma separated if multiple options are selected. Commas in option texts escaped with backslash.
     */
    public function get_value() {

        // Is the select multiple?
        $multiple = $this->field->hasAttribute('multiple');

        $selectedoptions = array(); // To accumulate found selected options.

        // Selenium getValue() implementation breaks - separates - values having
        // commas within them, so we'll be looking for options with the 'selected' attribute instead.
        if ($this->running_javascript()) {
            // Get all the options in the select and extract their value/text pairs.
            $alloptions = $this->field->findAll('xpath', '//option');
            foreach ($alloptions as $option) {
                // Is it selected?
                if ($option->hasAttribute('selected')) {
                    if ($multiple) {
                        // If the select is multiple, text commas must be encoded.
                        $selectedoptions[] = trim(str_replace(',', '\,', $option->getText()));
                    } else {
                        $selectedoptions[] =  trim($option->getText());
                    }
                }
            }

        // Goutte does not keep the 'selected' attribute updated, but its getValue() returns
        // the selected elements correctly, also those having commas within them.
        } else {
            $values = $this->field->getValue();
            // Get all the options in the select and extract their value/text pairs.
            $alloptions = $this->field->findAll('xpath', '//option');
            foreach ($alloptions as $option) {
                // Is it selected?
                if (in_array($option->getValue(), $values)) {
                    if ($multiple) {
                        // If the select is multiple, text commas must be encoded.
                        $selectedoptions[] = trim(str_replace(',', '\,', $option->getText()));
                    } else {
                        $selectedoptions[] =  trim($option->getText());
                    }
                }
            }
        }

        return implode(', ', $selectedoptions);
    }
}