protected function renderContext(ArcanistLintMessage $message, array $line_data)
{
$lines_of_context = 3;
$out = array();
$num_lines = count($line_data);
// make line numbers line up with array indexes
array_unshift($line_data, '');
$line_num = min($message->getLine(), $num_lines);
$line_num = max(1, $line_num);
// Print out preceding context before the impacted region.
$cursor = max(1, $line_num - $lines_of_context);
for (; $cursor < $line_num; $cursor++) {
$out[] = $this->renderLine($cursor, $line_data[$cursor]);
}
$text = $message->getOriginalText();
$start = $message->getChar() - 1;
$patch = '';
// Refine original and replacement text to eliminate start and end in common
if ($message->isPatchable()) {
$patch = $message->getReplacementText();
$text_strlen = strlen($text);
$patch_strlen = strlen($patch);
$min_length = min($text_strlen, $patch_strlen);
$same_at_front = 0;
for ($ii = 0; $ii < $min_length; $ii++) {
if ($text[$ii] !== $patch[$ii]) {
break;
}
$same_at_front++;
$start++;
if ($text[$ii] == "\n") {
$out[] = $this->renderLine($cursor, $line_data[$cursor]);
$cursor++;
$start = 0;
$line_num++;
}
}
// deal with shorter string ' ' longer string ' a '
$min_length -= $same_at_front;
// And check the end of the string
$same_at_end = 0;
for ($ii = 1; $ii <= $min_length; $ii++) {
if ($text[$text_strlen - $ii] !== $patch[$patch_strlen - $ii]) {
break;
}
$same_at_end++;
}
$text = substr($text, $same_at_front, $text_strlen - $same_at_end - $same_at_front);
$patch = substr($patch, $same_at_front, $patch_strlen - $same_at_end - $same_at_front);
}
// Print out the impacted region itself.
$diff = $message->isPatchable() ? '-' : null;
$text_lines = explode("\n", $text);
$text_length = count($text_lines);
$intraline = $text != '' || $start || !preg_match('/\\n$/', $patch);
if ($intraline) {
for (; $cursor < $line_num + $text_length; $cursor++) {
$chevron = $cursor == $line_num;
// We may not have any data if, e.g., the old file does not exist.
$data = idx($line_data, $cursor, null);
// Highlight the problem substring.
$text_line = $text_lines[$cursor - $line_num];
if (strlen($text_line)) {
$data = substr_replace($data, phutil_console_format('##%s##', $text_line), $cursor == $line_num ? $start : 0, strlen($text_line));
}
$out[] = $this->renderLine($cursor, $data, $chevron, $diff);
}
}
// Print out replacement text.
if ($message->isPatchable()) {
// Strip trailing newlines, since "explode" will create an extra patch
// line for these.
if (strlen($patch) && $patch[strlen($patch) - 1] === "\n") {
$patch = substr($patch, 0, -1);
}
$patch_lines = explode("\n", $patch);
$patch_length = count($patch_lines);
$patch_line = $patch_lines[0];
$len = isset($text_lines[0]) ? strlen($text_lines[0]) : 0;
$patched = phutil_console_format('##%s##', $patch_line);
if ($intraline) {
$patched = substr_replace($line_data[$line_num], $patched, $start, $len);
}
$out[] = $this->renderLine(null, $patched, false, '+');
foreach (array_slice($patch_lines, 1) as $patch_line) {
$out[] = $this->renderLine(null, phutil_console_format('##%s##', $patch_line), false, '+');
}
}
$end = min($num_lines, $cursor + $lines_of_context);
for (; $cursor < $end; $cursor++) {
// If there is no original text, we didn't print out a chevron or any
// highlighted text above, so print it out here. This allows messages
// which don't have any original/replacement information to still
// render with indicator chevrons.
if ($text || $message->isPatchable()) {
$chevron = false;
} else {
$chevron = $cursor == $line_num;
}
$out[] = $this->renderLine($cursor, $line_data[$cursor], $chevron);
// With original text, we'll render the text highlighted above. If the
// lint message only has a line/char offset there's nothing to
// highlight, so print out a caret on the next line instead.
if ($chevron && $message->getChar()) {
$out[] = $this->renderCaret($message->getChar());
}
}
$out[] = null;
return implode("\n", $out);
}
