HTMLFormFieldCloner.php

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<?php

class HTMLFormFieldCloner extends HTMLFormField {
    private static $counter = 0;

    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;
        }
    }

    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;
    }

    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 );
    }

    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;
    }
}