PhabricatorTokenizerEditField.php
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	<?php

	abstract class PhabricatorTokenizerEditField
	extends PhabricatorPHIDListEditField {

	private $commentActionLabel;

	abstract protected function newDatasource();

	public function setCommentActionLabel($label) {
	$this->commentActionLabel = $label;
	return $this;
	}

	public function getCommentActionLabel() {
	return $this->commentActionLabel;
	}

	protected function newControl() {
	$control = id(new AphrontFormTokenizerControl())
	->setDatasource($this->newDatasource());

	$initial_value = $this->getInitialValue();
	if ($initial_value !== null) {
	$control->setOriginalValue($initial_value);
	}

	return $control;
	}

	protected function getInitialValueFromSubmit(AphrontRequest $request, $key) {
	return $request->getArr($key.'.original');
	}

	protected function newEditType() {
	$type = parent::newEditType();

	if ($this->getUseEdgeTransactions()) {
	$datasource = $this->newDatasource()
	->setViewer($this->getViewer());
	$type->setDatasource($datasource);
	}

	return $type;
	}

	public function getCommentEditTypes() {
	if (!$this->getUseEdgeTransactions()) {
	return parent::getCommentEditTypes();
	}

	$transaction_type = $this->getTransactionType();
	if ($transaction_type === null) {
	return array();
	}

	$label = $this->getCommentActionLabel();
	if ($label === null) {
	return array();
	}

	$type_key = $this->getEditTypeKey();
	$base = $this->getEditType();

	$add = id(clone $base)
	->setEditType($type_key.'.add')
	->setEdgeOperation('+')
	->setLabel($label);

	return array($add);
	}

	}