AphrontHTTPHeaderParser.php
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	<?php

	final class AphrontHTTPHeaderParser extends Phobject {

	private $name;
	private $content;
	private $pairs;

	public function parseRawHeader($raw_header) {
	$this->name = null;
	$this->content = null;

	$parts = explode(':', $raw_header, 2);
	$this->name = trim($parts[0]);
	if (count($parts) > 1) {
	$this->content = trim($parts[1]);
	}

	$this->pairs = null;

	return $this;
	}

	public function getHeaderName() {
	$this->requireParse();
	return $this->name;
	}

	public function getHeaderContent() {
	$this->requireParse();
	return $this->content;
	}

	public function getHeaderContentAsPairs() {
	$content = $this->getHeaderContent();


	$state = 'prekey';
	$length = strlen($content);

	$pair_name = null;
	$pair_value = null;

	$pairs = array();
	$ii = 0;
	while ($ii < $length) {
	$c = $content[$ii];

	switch ($state) {
	case 'prekey';
	// We're eating space in front of a key.
	if ($c == ' ') {
	$ii++;
	break;
	}
	$pair_name = '';
	$state = 'key';
	break;
	case 'key';
	// We're parsing a key name until we find "=" or ";".
	if ($c == ';') {
	$state = 'done';
	break;
	}

	if ($c == '=') {
	$ii++;
	$state = 'value';
	break;
	}

	$ii++;
	$pair_name .= $c;
	break;
	case 'value':
	// We found an "=", so now figure out if the value is quoted
	// or not.
	if ($c == '"') {
	$ii++;
	$state = 'quoted';
	break;
	}
	$state = 'unquoted';
	break;
	case 'quoted':
	// We're in a quoted string, parse until we find the closing quote.
	if ($c == '"') {
	$ii++;
	$state = 'done';
	break;
	}

	$ii++;
	$pair_value .= $c;
	break;
	case 'unquoted':
	// We're in an unquoted string, parse until we find a space or a
	// semicolon.
	if ($c == ' ' \|\| $c == ';') {
	$state = 'done';
	break;
	}
	$ii++;
	$pair_value .= $c;
	break;
	case 'done':
	// We parsed something, so eat any trailing whitespace and semicolons
	// and look for a new value.
	if ($c == ' ' \|\| $c == ';') {
	$ii++;
	break;
	}

	$pairs[] = array(
	$pair_name,
	$pair_value,
	);

	$pair_name = null;
	$pair_value = null;

	$state = 'prekey';
	break;
	}
	}

	if ($state == 'quoted') {
	throw new Exception(
	pht(
	'Header has unterminated double quote for key "%s".',
	$pair_name));
	}

	if ($pair_name !== null) {
	$pairs[] = array(
	$pair_name,
	$pair_value,
	);
	}

	return $pairs;
	}

	private function requireParse() {
	if ($this->name === null) {
	throw new PhutilInvalidStateException('parseRawHeader');
	}
	}

	}

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