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[mediawiki.git] / includes / htmlform / HTMLFormFieldCloner.php

<?php

/**
 * A container for HTMLFormFields that allows for multiple copies of the set of
 * fields to be displayed to and entered by the user.
 *
 * Recognized parameters, besides the general ones, include:
 *   fields - HTMLFormField descriptors for the subfields this cloner manages.
 *     The format is just like for the HTMLForm. A field with key 'delete' is
 *     special: it must have type = submit and will serve to delete the group
 *     of fields.
 *   required - If specified, at least one group of fields must be submitted.
 *   format - HTMLForm display format to use when displaying the subfields:
 *     'table', 'div', or 'raw'.
 *   row-legend - If non-empty, each group of subfields will be enclosed in a
 *     fieldset. The value is the name of a message key to use as the legend.
 *   create-button-message - Message to use as the text of the button to
 *     add an additional group of fields.
 *   delete-button-message - Message to use as the text of automatically-
 *     generated 'delete' button. Ignored if 'delete' is included in 'fields'.
 *
 * In the generated HTML, the subfields will be named along the lines of
 * "clonerName[index][fieldname]", with ids "clonerId--index--fieldid". 'index'
 * may be a number or an arbitrary string, and may likely change when the page
 * is resubmitted. Cloners may be nested, resulting in field names along the
 * lines of "cloner1Name[index1][cloner2Name][index2][fieldname]" and
 * corresponding ids.
 *
 * Use of cloner may result in submissions of the page that are not submissions
 * of the HTMLForm, when non-JavaScript clients use the create or remove buttons.
 *
 * The result is an array, with values being arrays mapping subfield names to
 * their values. On non-HTMLForm-submission page loads, there may also be
 * additional (string) keys present with other types of values.
 *
 * @since 1.23
 */
class HTMLFormFieldCloner extends HTMLFormField {
        private static $counter = 0;

        /**
         * @var string String uniquely identifying this cloner instance and
         * unlikely to exist otherwise in the generated HTML, while still being
         * valid as part of an HTML id.
         */
        protected $uniqueId;

        public function __construct( $params ) {
                $this->uniqueId = get_class( $this ) . ++self::$counter . 'x';
                parent::__construct( $params );

                if ( empty( $this->mParams['fields'] ) || !is_array( $this->mParams['fields'] ) ) {
                        throw new MWException( 'HTMLFormFieldCloner called without any fields' );
                }

                // Make sure the delete button, if explicitly specified, is sane
                if ( isset( $this->mParams['fields']['delete'] ) ) {
                        $class = 'mw-htmlform-cloner-delete-button';
                        $info = $this->mParams['fields']['delete'] + [
                                'cssclass' => $class
                        ];
                        unset( $info['name'], $info['class'] );

                        if ( !isset( $info['type'] ) || $info['type'] !== 'submit' ) {
                                throw new MWException(
                                        'HTMLFormFieldCloner delete field, if specified, must be of type "submit"'
                                );
                        }

                        if ( !in_array( $class, explode( ' ', $info['cssclass'] ) ) ) {
                                $info['cssclass'] .= " $class";
                        }

                        $this->mParams['fields']['delete'] = $info;
                }
        }

        /**
         * Create the HTMLFormFields that go inside this element, using the
         * specified key.
         *
         * @param string $key Array key under which these fields should be named
         * @return HTMLFormField[]
         */
        protected function createFieldsForKey( $key ) {
                $fields = [];
                foreach ( $this->mParams['fields'] as $fieldname => $info ) {
                        $name = "{$this->mName}[$key][$fieldname]";
                        if ( isset( $info['name'] ) ) {
                                $info['name'] = "{$this->mName}[$key][{$info['name']}]";
                        } else {
                                $info['name'] = $name;
                        }
                        if ( isset( $info['id'] ) ) {
                                $info['id'] = Sanitizer::escapeId( "{$this->mID}--$key--{$info['id']}" );
                        } else {
                                $info['id'] = Sanitizer::escapeId( "{$this->mID}--$key--$fieldname" );
                        }
                        $field = HTMLForm::loadInputFromParameters( $name, $info, $this->mParent );
                        $fields[$fieldname] = $field;
                }
                return $fields;
        }

        /**
         * Re-key the specified values array to match the names applied by
         * createFieldsForKey().
         *
         * @param string $key Array key under which these fields should be named
         * @param array $values Values array from the request
         * @return array
         */
        protected function rekeyValuesArray( $key, $values ) {
                $data = [];
                foreach ( $values as $fieldname => $value ) {
                        $name = "{$this->mName}[$key][$fieldname]";
                        $data[$name] = $value;
                }
                return $data;
        }

        protected function needsLabel() {
                return false;
        }

        public function loadDataFromRequest( $request ) {
                // It's possible that this might be posted with no fields. Detect that
                // by looking for an edit token.
                if ( !$request->getCheck( 'wpEditToken' ) && $request->getArray( $this->mName ) === null ) {
                        return $this->getDefault();
                }

                $values = $request->getArray( $this->mName );
                if ( $values === null ) {
                        $values = [];
                }

                $ret = [];
                foreach ( $values as $key => $value ) {
                        if ( $key === 'create' || isset( $value['delete'] ) ) {
                                $ret['nonjs'] = 1;
                                continue;
                        }

                        // Add back in $request->getValues() so things that look for e.g.
                        // wpEditToken don't fail.
                        $data = $this->rekeyValuesArray( $key, $value ) + $request->getValues();

                        $fields = $this->createFieldsForKey( $key );
                        $subrequest = new DerivativeRequest( $request, $data, $request->wasPosted() );
                        $row = [];
                        foreach ( $fields as $fieldname => $field ) {
                                if ( $field->skipLoadData( $subrequest ) ) {
                                        continue;
                                } elseif ( !empty( $field->mParams['disabled'] ) ) {
                                        $row[$fieldname] = $field->getDefault();
                                } else {
                                        $row[$fieldname] = $field->loadDataFromRequest( $subrequest );
                                }
                        }
                        $ret[] = $row;
                }

                if ( isset( $values['create'] ) ) {
                        // Non-JS client clicked the "create" button.
                        $fields = $this->createFieldsForKey( $this->uniqueId );
                        $row = [];
                        foreach ( $fields as $fieldname => $field ) {
                                if ( !empty( $field->mParams['nodata'] ) ) {
                                        continue;
                                } else {
                                        $row[$fieldname] = $field->getDefault();
                                }
                        }
                        $ret[] = $row;
                }

                return $ret;
        }

        public function getDefault() {
                $ret = parent::getDefault();

                // The default default is one entry with all subfields at their
                // defaults.
                if ( $ret === null ) {
                        $fields = $this->createFieldsForKey( $this->uniqueId );
                        $row = [];
                        foreach ( $fields as $fieldname => $field ) {
                                if ( !empty( $field->mParams['nodata'] ) ) {
                                        continue;
                                } else {
                                        $row[$fieldname] = $field->getDefault();
                                }
                        }
                        $ret = [ $row ];
                }

                return $ret;
        }

        public function cancelSubmit( $values, $alldata ) {
                if ( isset( $values['nonjs'] ) ) {
                        return true;
                }

                foreach ( $values as $key => $value ) {
                        $fields = $this->createFieldsForKey( $key );
                        foreach ( $fields as $fieldname => $field ) {
                                if ( !array_key_exists( $fieldname, $value ) ) {
                                        continue;
                                }
                                if ( $field->cancelSubmit( $value[$fieldname], $alldata ) ) {
                                        return true;
                                }
                        }
                }

                return parent::cancelSubmit( $values, $alldata );
        }

        public function validate( $values, $alldata ) {
                if ( isset( $this->mParams['required'] )
                        && $this->mParams['required'] !== false
                        && !$values
                ) {
                        return $this->msg( 'htmlform-cloner-required' )->parseAsBlock();
                }

                if ( isset( $values['nonjs'] ) ) {
                        // The submission was a non-JS create/delete click, so fail
                        // validation in case cancelSubmit() somehow didn't already handle
                        // it.
                        return false;
                }

                foreach ( $values as $key => $value ) {
                        $fields = $this->createFieldsForKey( $key );
                        foreach ( $fields as $fieldname => $field ) {
                                if ( !array_key_exists( $fieldname, $value ) ) {
                                        continue;
                                }
                                $ok = $field->validate( $value[$fieldname], $alldata );
                                if ( $ok !== true ) {
                                        return false;
                                }
                        }
                }

                return parent::validate( $values, $alldata );
        }

        /**
         * Get the input HTML for the specified key.
         *
         * @param string $key Array key under which the fields should be named
         * @param array $values
         * @return string
         */
        protected function getInputHTMLForKey( $key, $values ) {
                $displayFormat = isset( $this->mParams['format'] )
                        ? $this->mParams['format']
                        : $this->mParent->getDisplayFormat();

                // Conveniently, PHP method names are case-insensitive.
                $getFieldHtmlMethod = $displayFormat == 'table' ? 'getTableRow' : ( 'get' . $displayFormat );

                $html = '';
                $hidden = '';
                $hasLabel = false;

                $fields = $this->createFieldsForKey( $key );
                foreach ( $fields as $fieldname => $field ) {
                        $v = array_key_exists( $fieldname, $values )
                                ? $values[$fieldname]
                                : $field->getDefault();

                        if ( $field instanceof HTMLHiddenField ) {
                                // HTMLHiddenField doesn't generate its own HTML
                                list( $name, $value, $params ) = $field->getHiddenFieldData( $v );
                                $hidden .= Html::hidden( $name, $value, $params ) . "\n";
                        } else {
                                $html .= $field->$getFieldHtmlMethod( $v );

                                $labelValue = trim( $field->getLabel() );
                                if ( $labelValue != '&#160;' && $labelValue !== '' ) {
                                        $hasLabel = true;
                                }
                        }
                }

                if ( !isset( $fields['delete'] ) ) {
                        $name = "{$this->mName}[$key][delete]";
                        $label = isset( $this->mParams['delete-button-message'] )
                                ? $this->mParams['delete-button-message']
                                : 'htmlform-cloner-delete';
                        $field = HTMLForm::loadInputFromParameters( $name, [
                                'type' => 'submit',
                                'name' => $name,
                                'id' => Sanitizer::escapeId( "{$this->mID}--$key--delete" ),
                                'cssclass' => 'mw-htmlform-cloner-delete-button',
                                'default' => $this->getMessage( $label )->text(),
                        ], $this->mParent );
                        $v = $field->getDefault();

                        if ( $displayFormat === 'table' ) {
                                $html .= $field->$getFieldHtmlMethod( $v );
                        } else {
                                $html .= $field->getInputHTML( $v );
                        }
                }

                if ( $displayFormat !== 'raw' ) {
                        $classes = [
                                'mw-htmlform-cloner-row',
                        ];

                        if ( !$hasLabel ) { // Avoid strange spacing when no labels exist
                                $classes[] = 'mw-htmlform-nolabel';
                        }

                        $attribs = [
                                'class' => implode( ' ', $classes ),
                        ];

                        if ( $displayFormat === 'table' ) {
                                $html = Html::rawElement( 'table',
                                        $attribs,
                                        Html::rawElement( 'tbody', [], "\n$html\n" ) ) . "\n";
                        } else {
                                $html = Html::rawElement( 'div', $attribs, "\n$html\n" );
                        }
                }

                $html .= $hidden;

                if ( !empty( $this->mParams['row-legend'] ) ) {
                        $legend = $this->msg( $this->mParams['row-legend'] )->text();
                        $html = Xml::fieldset( $legend, $html );
                }

                return $html;
        }

        public function getInputHTML( $values ) {
                $html = '';

                foreach ( (array)$values as $key => $value ) {
                        if ( $key === 'nonjs' ) {
                                continue;
                        }
                        $html .= Html::rawElement( 'li', [ 'class' => 'mw-htmlform-cloner-li' ],
                                $this->getInputHTMLForKey( $key, $value )
                        );
                }

                $template = $this->getInputHTMLForKey( $this->uniqueId, null );
                $html = Html::rawElement( 'ul', [
                        'id' => "mw-htmlform-cloner-list-{$this->mID}",
                        'class' => 'mw-htmlform-cloner-ul',
                        'data-template' => $template,
                        'data-unique-id' => $this->uniqueId,
                ], $html );

                $name = "{$this->mName}[create]";
                $label = isset( $this->mParams['create-button-message'] )
                        ? $this->mParams['create-button-message']
                        : 'htmlform-cloner-create';
                $field = HTMLForm::loadInputFromParameters( $name, [
                        'type' => 'submit',
                        'name' => $name,
                        'id' => Sanitizer::escapeId( "{$this->mID}--create" ),
                        'cssclass' => 'mw-htmlform-cloner-create-button',
                        'default' => $this->getMessage( $label )->text(),
                ], $this->mParent );
                $html .= $field->getInputHTML( $field->getDefault() );

                return $html;
        }
}