AphrontTagView.php
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	<?php

	/**
	* View which renders down to a single tag, and provides common access for tag
	* attributes (setting classes, sigils, IDs, etc).
	*/
	abstract class AphrontTagView extends AphrontView {

	private $id;
	private $classes = array();
	private $sigils = array();
	private $style;
	private $metadata;
	private $mustCapture;
	private $workflow;

	public function setWorkflow($workflow) {
	$this->workflow = $workflow;
	return $this;
	}

	public function getWorkflow() {
	return $this->workflow;
	}

	public function setMustCapture($must_capture) {
	$this->mustCapture = $must_capture;
	return $this;
	}

	public function getMustCapture() {
	return $this->mustCapture;
	}

	final public function setMetadata(array $metadata) {
	$this->metadata = $metadata;
	return $this;
	}

	final public function getMetadata() {
	return $this->metadata;
	}

	final public function setStyle($style) {
	$this->style = $style;
	return $this;
	}

	final public function getStyle() {
	return $this->style;
	}

	final public function addSigil($sigil) {
	$this->sigils[] = $sigil;
	return $this;
	}

	final public function getSigils() {
	return $this->sigils;
	}

	public function addClass($class) {
	$this->classes[] = $class;
	return $this;
	}

	public function getClasses() {
	return $this->classes;
	}

	public function setID($id) {
	$this->id = $id;
	return $this;
	}

	public function getID() {
	return $this->id;
	}

	protected function getTagName() {
	return 'div';
	}

	protected function getTagAttributes() {
	return array();
	}

	protected function getTagContent() {
	return $this->renderChildren();
	}

	protected function willRender() {
	return;
	}

	final public function render() {
	$this->willRender();

	$attributes = $this->getTagAttributes();

	$implode = array('class', 'sigil');
	foreach ($implode as $attr) {
	if (isset($attributes[$attr])) {
	if (is_array($attributes[$attr])) {
	$attributes[$attr] = implode(' ', $attributes[$attr]);
	}
	}
	}

	if (!is_array($attributes)) {
	$class = get_class($this);
	throw new Exception(
	pht("View '%s' did not return an array from getTagAttributes()!",
	$class));
	}

	$sigils = $this->sigils;
	if ($this->workflow) {
	$sigils[] = 'workflow';
	}

	$tag_view_attributes = array(
	'id' => $this->id,

	'class' => implode(' ', $this->classes),
	'style' => $this->style,

	'meta' => $this->metadata,
	'sigil' => $sigils ? implode(' ', $sigils) : null,
	'mustcapture' => $this->mustCapture,
	);

	foreach ($tag_view_attributes as $key => $value) {
	if ($value === null) {
	continue;
	}
	if (!isset($attributes[$key])) {
	$attributes[$key] = $value;
	continue;
	}
	switch ($key) {
	case 'class':
	case 'sigil':
	$attributes[$key] = $attributes[$key].' '.$value;
	break;
	default:
	// Use the explicitly set value rather than the tag default value.
	$attributes[$key] = $value;
	break;
	}
	}

	return javelin_tag(
	$this->getTagName(),
	$attributes,
	$this->getTagContent());
	}
	}

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