PhutilRemarkupQuotedBlockRule.php
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	<?php

	abstract class PhutilRemarkupQuotedBlockRule
	extends PhutilRemarkupBlockRule {

	final public function supportsChildBlocks() {
	return true;
	}

	public function willMarkupChildBlocks() {
	$engine = $this->getEngine();

	$depth = $engine->getQuoteDepth();
	$depth = $depth + 1;
	$engine->setQuoteDepth($depth);
	}

	public function didMarkupChildBlocks() {
	$engine = $this->getEngine();

	$depth = $engine->getQuoteDepth();
	$depth = $depth - 1;
	$engine->setQuoteDepth($depth);
	}

	final protected function normalizeQuotedBody($text) {
	$text = phutil_split_lines($text, true);
	foreach ($text as $key => $line) {
	$text[$key] = substr($line, 1);
	}

	// If every line in the block is empty or begins with at least one leading
	// space, strip the initial space off each line. When we quote text, we
	// normally add "> " (with a space) to the beginning of each line, which
	// can disrupt some other rules. If the block appears to have this space
	// in front of each line, remove it.

	$strip_space = true;
	foreach ($text as $key => $line) {
	$len = strlen($line);

	if (!$len) {
	// We'll still strip spaces if there are some completely empty
	// lines, they may have just had trailing whitespace trimmed.
	continue;
	}

	// If this line is part of a nested quote block, just ignore it when
	// realigning this quote block. It's either an author attribution
	// line with ">>!", or we'll deal with it in a subrule when processing
	// the nested quote block.
	if ($line[0] == '>') {
	continue;
	}

	if ($line[0] == ' ' \|\| $line[0] == "\n") {
	continue;
	}

	// The first character of this line is something other than a space, so
	// we can't strip spaces.
	$strip_space = false;
	break;
	}

	if ($strip_space) {
	foreach ($text as $key => $line) {
	$len = strlen($line);
	if (!$len) {
	continue;
	}

	if ($line[0] !== ' ') {
	continue;
	}

	$text[$key] = substr($line, 1);
	}
	}

	// Strip leading empty lines.
	foreach ($text as $key => $line) {
	if (!strlen(trim($line))) {
	unset($text[$key]);
	} else {
	break;
	}
	}

	return implode('', $text);
	}

	final protected function getQuotedText($text) {
	$text = rtrim($text, "\n");

	$no_whitespace = array(
	// For readability, we render nested quotes as ">> quack",
	// not "> > quack".
	'>' => true,

	// If the line is empty except for a newline, do not add an
	// unnecessary dangling space.
	"\n" => true,
	);

	$text = phutil_split_lines($text, true);
	foreach ($text as $key => $line) {
	$c = null;
	if (isset($line[0])) {
	$c = $line[0];
	} else {
	$c = null;
	}

	if (isset($no_whitespace[$c])) {
	$text[$key] = '>'.$line;
	} else {
	$text[$key] = '> '.$line;
	}
	}
	$text = implode('', $text);

	return $text;
	}

	}

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