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phorge/src/applications/conduit/method/differential/ConduitAPI_differential_parsecommitmessage_Method.php
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ConduitAPI_differential_parsecommitmessage_Method.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @group conduit
*/
final class ConduitAPI_differential_parsecommitmessage_Method
extends ConduitAPIMethod {
public function getMethodDescription() {
return "Parse commit messages for Differential fields.";
}
public function defineParamTypes() {
return array(
'corpus' => 'required string',
'partial' => 'optional bool',
);
}
public function defineReturnType() {
return 'nonempty dict';
}
public function defineErrorTypes() {
return array(
);
}
protected function execute(ConduitAPIRequest $request) {
$corpus = $request->getValue('corpus');
$is_partial = $request->getValue('partial');
$aux_fields = DifferentialFieldSelector::newSelector()
->getFieldSpecifications();
foreach ($aux_fields as $key => $aux_field) {
if (!$aux_field->shouldAppearOnCommitMessage()) {
unset($aux_fields[$key]);
}
$aux_field->setUser($request->getUser());
}
$aux_fields = mpull($aux_fields, null, 'getCommitMessageKey');
// Build a map from labels (like "Test Plan") to field keys
// (like "testPlan").
$label_map = $this->buildLabelMap($aux_fields);
$field_map = $this->parseCommitMessage($corpus, $label_map);
$fields = array();
$errors = array();
foreach ($field_map as $field_key => $field_value) {
$field = $aux_fields[$field_key];
try {
$fields[$field_key] = $field->parseValueFromCommitMessage($field_value);
$field->setValueFromParsedCommitMessage($fields[$field_key]);
} catch (DifferentialFieldParseException $ex) {
$field_label = $field->renderLabelForCommitMessage();
$errors[] = "Error parsing field '{$field_label}': ".$ex->getMessage();
}
}
if (!$is_partial) {
foreach ($aux_fields as $field_key => $aux_field) {
try {
$aux_field->validateField();
} catch (DifferentialFieldValidationException $ex) {
$field_label = $aux_field->renderLabelForCommitMessage();
$errors[] =
"Invalid or missing field '{$field_label}': ".
$ex->getMessage();
}
}
}
return array(
'errors' => $errors,
'fields' => $fields,
);
}
private function buildLabelMap(array $aux_fields) {
assert_instances_of($aux_fields, 'DifferentialFieldSpecification');
$label_map = array();
foreach ($aux_fields as $key => $aux_field) {
$labels = $aux_field->getSupportedCommitMessageLabels();
foreach ($labels as $label) {
$normal_label = strtolower($label);
if (!empty($label_map[$normal_label])) {
$previous = $label_map[$normal_label];
throw new Exception(
"Field label '{$label}' is parsed by two fields: '{$key}' and ".
"'{$previous}'. Each label must be parsed by only one field.");
}
$label_map[$normal_label] = $key;
}
}
return $label_map;
}
private function buildLabelRegexp(array $label_map) {
$field_labels = array_keys($label_map);
foreach ($field_labels as $key => $label) {
$field_labels[$key] = preg_quote($label, '/');
}
$field_labels = implode('|', $field_labels);
$field_pattern = '/^(?P<field>'.$field_labels.'):(?P<text>.*)$/i';
return $field_pattern;
}
private function parseCommitMessage($corpus, array $label_map) {
$label_regexp = $this->buildLabelRegexp($label_map);
// Note, deliberately not populating $seen with 'title' because it is
// optional to include the 'Title:' label. We're doing a little special
// casing to consume the first line as the title regardless of whether you
// label it as such or not.
$field = 'title';
$seen = array();
$lines = explode("\n", trim($corpus));
$field_map = array();
foreach ($lines as $key => $line) {
$match = null;
if (preg_match($label_regexp, $line, $match)) {
$lines[$key] = trim($match['text']);
$field = $label_map[strtolower($match['field'])];
if (!empty($seen[$field])) {
throw new Exception(
"Field '{$field}' occurs twice in commit message!");
}
$seen[$field] = true;
}
$field_map[$key] = $field;
}
$fields = array();
foreach ($lines as $key => $line) {
$fields[$field_map[$key]][] = $line;
}
// This is a piece of special-cased magic which allows you to omit the
// field labels for "title" and "summary". If the user enters a large block
// of text at the beginning of the commit message with an empty line in it,
// treat everything before the blank line as "title" and everything after
// as "summary".
if (isset($fields['title']) && empty($fields['summary'])) {
$lines = $fields['title'];
for ($ii = 0; $ii < count($lines); $ii++) {
if (strlen(trim($lines[$ii])) == 0) {
break;
}
}
if ($ii != count($lines)) {
$fields['title'] = array_slice($lines, 0, $ii);
$fields['summary'] = array_slice($lines, $ii);
}
}
// Implode all the lines back into chunks of text.
foreach ($fields as $name => $lines) {
$data = rtrim(implode("\n", $lines));
$data = ltrim($data, "\n");
$fields[$name] = $data;
}
return $fields;
}
}

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