FeedsJSONPathParser.inc in Feeds JSONPath Parser 7
Same filename and directory in other branches
Contains FeedsJSONPathParser.
File
FeedsJSONPathParser.incView source
<?php
/**
* @file
* Contains FeedsJSONPathParser.
*/
use Flow\JSONPath\JSONPath;
/**
* Parses JSON using JSONPath.
*/
class FeedsJSONPathParser extends FeedsParser {
/**
* A regular expression that finds four byte UTF-8 chars.
*
* @var string
*/
protected static $fourByteRegex = '/(?:\\xF0[\\x90-\\xBF][\\x80-\\xBF]{2}|[\\xF1-\\xF3][\\x80-\\xBF]{3}|\\xF4[\\x80-\\x8F][\\x80-\\xBF]{2})/s';
/**
* The source fields to debug.
*
* @var array
*/
protected $debug = array();
/**
* Loads the necessary library.
*
* @throws RuntimeException
* Thrown if the library does not exist.
*/
protected function loadLibrary() {
if (!feeds_jsonpath_parser_load_library()) {
if (user_access('administer site configuration')) {
$link = l(t('status report'), 'admin/reports/status');
}
else {
$link = t('status report');
}
throw new RuntimeException(t('The JSONPath library is not installed. Check the !status_report_link for more info.', array(
'!status_report_link' => $link,
)));
}
}
/**
* Implements FeedsParser::parse().
*/
public function parse(FeedsSource $source, FeedsFetcherResult $fetcher_result) {
$this
->loadLibrary();
$mappings = $this
->getOwnMappings();
$source_config = $source
->getConfigFor($this);
// Allow config inheritance.
if (empty($source_config)) {
$source_config = $this->config;
}
$this->debug = array_keys(array_filter($source_config['debug']['options']));
$raw = trim($fetcher_result
->getRaw());
$result = new FeedsParserResult();
// Set link so we can set the result link attribute.
$fetcher_config = $source
->getConfigFor($source->importer->fetcher);
$result->link = $fetcher_config['source'];
$array = json_decode($raw, TRUE);
// Support JSON lines format.
if (!is_array($array)) {
$raw = preg_replace('/}\\s*{/', '},{', $raw);
$raw = '[' . $raw . ']';
$array = json_decode($raw, TRUE);
}
if (!is_array($array)) {
throw new Exception(t('There was an error decoding the JSON document.'));
}
$all_items = $this
->jsonPath($array, $source_config['context']);
unset($array);
// Batch.
$state = $source
->state(FEEDS_PARSE);
if (!$state->total) {
$state->total = count($all_items);
}
$start = (int) $state->pointer;
$state->pointer = $start + $source->importer
->getLimit();
$all_items = array_slice($all_items, $start, $source->importer
->getLimit());
// Set progress state.
$state
->progress($state->total, $state->pointer);
// Debug output.
$this
->debug($all_items, 'context');
foreach ($all_items as $item) {
// Invoke a hook to check whether the item should be skipped.
if ($this
->invokeHook($item, $source) === TRUE) {
continue;
}
$parsed_item = $variables = array();
foreach ($source_config['sources'] as $source_key => $query) {
// Variable substitution.
$query = strtr($query, $variables);
$parsed = $this
->parseSourceElement($item, $query, $source_key);
$variables['{' . $mappings[$source_key] . '}'] = is_array($parsed) ? reset($parsed) : $parsed;
// Avoid null values.
if (isset($parsed)) {
$parsed_item[$source_key] = $parsed;
}
}
if (!empty($parsed_item)) {
$result->items[] = $parsed_item;
}
}
return $result;
}
/**
* Searches an array via JSONPath.
*
* @param array $array
* The input array to parse.
* @param string $expression
* The JSONPath expression.
*
* @return array
* Returns the parsed jsonpath expression.
*
* @throws RuntimeException
* In case the parsed json is not an array.
*/
protected function jsonPath($array, $expression) {
$result = (new JSONPath($array))
->find($expression)
->data();
// If the returned result is empty, just return an empty array.
if (empty($result)) {
return array();
}
// If the parsed json is not an array, throw an exception.
if (!is_array($result)) {
throw new RuntimeException(t('The parsed json must return an array.'));
}
return $result;
}
/**
* Parses one item from the context array.
*
* @param array $item
* An array containing one item from the context.
* @param string $query
* A JSONPath query.
* @param string $source
* The source element that corresponds to the query.
*
* @return array
* An array containing the results of the query.
*/
protected function parseSourceElement($item, $query, $source) {
if (empty($query)) {
return;
}
$results = $this
->jsonPath($item, $query);
$this
->debug($results, $source);
$count = count($results);
if ($count === 0) {
return;
}
foreach ($results as $delta => $value) {
if (is_string($value) && $value !== '') {
$results[$delta] = !empty($this->config['convert_four_byte']) ? $this
->convertFourBytes($value) : $this
->stripFourBytes($value);
}
}
if ($count === 1) {
return reset($results);
}
return $results;
}
/**
* Source form.
*/
public function sourceForm($source_config) {
$form = array();
if (empty($source_config)) {
$source_config = $this->config;
}
if (isset($source_config['allow_override']) && !$source_config['allow_override'] && empty($source_config['config'])) {
return;
}
// Add extensions that might get importerd.
$fetcher = feeds_importer($this->id)->fetcher;
if (isset($fetcher->config['allowed_extensions'])) {
if (strpos($fetcher->config['allowed_extensions'], 'json') === FALSE) {
$fetcher->config['allowed_extensions'] .= ' json';
}
}
$mappings_ = feeds_importer($this->id)->processor->config['mappings'];
$uniques = $mappings = array();
foreach ($mappings_ as $mapping) {
if (strpos($mapping['source'], 'jsonpath_parser:') === 0) {
$mappings[$mapping['source']] = $mapping['target'];
if (!empty($mapping['unique'])) {
$uniques[] = $mapping['target'];
}
}
}
$form['jsonpath'] = array(
'#type' => 'fieldset',
'#title' => t('JSONPath Parser Settings'),
'#collapsible' => TRUE,
'#collapsed' => TRUE,
'#tree' => TRUE,
);
if (empty($mappings)) {
// Detect if Feeds menu structure has changed. This will take a while to
// be released, but since I run dev it needs to work.
$feeds_menu = feeds_ui_menu();
if (isset($feeds_menu['admin/structure/feeds/list'])) {
$feeds_base = 'admin/structure/feeds/edit/';
}
else {
$feeds_base = 'admin/structure/feeds/';
}
$form['jsonpath']['error_message']['#markup'] = '<div class="help">' . t('No JSONPath mappings are defined. Define mappings !link.', array(
'!link' => l(t('here'), $feeds_base . $this->id . '/mapping'),
)) . '</div><br />';
return $form;
}
$form['jsonpath']['context'] = array(
'#type' => 'textfield',
'#title' => t('Context'),
'#required' => TRUE,
'#description' => t('This is the base query, all other queries will execute in this context.'),
'#default_value' => isset($source_config['context']) ? $source_config['context'] : '',
'#maxlength' => 1024,
'#size' => 80,
);
$form['jsonpath']['sources'] = array(
'#type' => 'fieldset',
);
if (!empty($uniques)) {
$items = array(
format_plural(count($uniques), t('Field <strong>!column</strong> is mandatory and considered unique: only one item per !column value will be created.', array(
'!column' => implode(', ', $uniques),
)), t('Fields <strong>!columns</strong> are mandatory and values in these columns are considered unique: only one entry per value in one of these columns will be created.', array(
'!columns' => implode(', ', $uniques),
))),
);
$form['jsonpath']['sources']['help']['#markup'] = '<div class="help">' . theme('item_list', array(
'items' => $items,
)) . '</div>';
}
$variables = array();
foreach ($mappings as $source => $target) {
$form['jsonpath']['sources'][$source] = array(
'#type' => 'textfield',
'#title' => $target,
'#description' => t('The JSONPath expression to execute.'),
'#default_value' => isset($source_config['sources'][$source]) ? $source_config['sources'][$source] : '',
'#maxlength' => 1024,
'#size' => 80,
);
if (!empty($variables)) {
$variable_text = format_plural(count($variables), t('The variable %v is available for replacement.', array(
'%v' => implode(', ', $variables),
)), t('The variables %v are available for replacement.', array(
'%v' => implode(', ', $variables),
)));
$form['jsonpath']['sources'][$source]['#description'] .= '<br />' . $variable_text;
}
$variables[] = '{' . $target . '}';
}
$form['jsonpath']['debug'] = array(
'#type' => 'fieldset',
'#title' => t('Debug'),
'#collapsible' => TRUE,
'#collapsed' => TRUE,
);
$form['jsonpath']['debug']['options'] = array(
'#type' => 'checkboxes',
'#title' => t('Debug query'),
'#options' => array_merge(array(
'context' => 'context',
), $mappings),
'#default_value' => isset($source_config['debug']['options']) ? $source_config['debug']['options'] : array(),
);
return $form;
}
/**
* Override parent::configForm().
*/
public function configForm(&$form_state) {
$config = $this
->getConfig();
$config['config'] = TRUE;
$form = $this
->sourceForm($config);
$form['jsonpath']['context']['#required'] = FALSE;
$form['jsonpath']['#collapsed'] = FALSE;
$form['jsonpath']['allow_override'] = array(
'#type' => 'checkbox',
'#title' => t('Allow source configuration override'),
'#description' => t('This setting allows feed nodes to specify their own JSONPath values for the context and sources.'),
'#default_value' => $config['allow_override'],
);
$form['jsonpath']['convert_four_byte'] = array(
'#type' => 'checkbox',
'#title' => t('Convert four byte characters'),
'#description' => t('Coverts four byte UTF-8 characters to their HTML entity. By default, four byte characters will be stripped.'),
'#default_value' => !empty($config['convert_four_byte']),
);
return $form;
}
/**
* Override parent::getMappingSources().
*/
public function getMappingSources() {
$mappings = $this
->filterMappings(feeds_importer($this->id)->processor->config['mappings']);
$next = 0;
if (!empty($mappings)) {
$keys = array_keys($mappings);
$nums = array();
foreach ($keys as $key) {
list(, $num) = explode(':', $key);
$nums[] = $num;
}
$max = max($nums);
$next = ++$max;
}
return array(
'jsonpath_parser:' . $next => array(
'name' => t('JSONPath Expression'),
'description' => t('Allows you to configure a JSONPath expression that will populate this field.'),
),
) + parent::getMappingSources();
}
public function sourceDefaults() {
return array();
}
/**
* Define defaults.
*/
public function configDefaults() {
return array(
'context' => '',
'sources' => array(),
'debug' => array(),
'allow_override' => FALSE,
'convert_four_byte' => FALSE,
);
}
/**
* Override parent::sourceFormValidate().
*
* If the values of this source are the same as the base config we set them to
* blank to that the values will be inherited from the importer defaults.
*
* @param array $values
* The values from the form to validate, passed by reference.
*/
public function sourceFormValidate(&$values) {
$config = $this
->getConfig();
$values = $values['jsonpath'];
$allow_override = $config['allow_override'];
unset($config['allow_override']);
unset($config['convert_four_byte']);
ksort($values);
ksort($config);
if ($values === $config || !$allow_override) {
$values = array();
return;
}
$this
->configFormValidate($values);
}
/**
* Override parent::sourceFormValidate().
*/
public function configFormValidate(&$values) {
if (isset($values['jsonpath'])) {
$values = $values['jsonpath'];
}
$values['context'] = isset($values['context']) ? trim($values['context']) : '';
if (!empty($values['sources'])) {
foreach ($values['sources'] as &$source) {
$source = trim($source);
}
}
}
/**
* Gets the mappings that belong to this parser.
*
* @return array
* An array of mappings keyed source => target.
*/
protected function getOwnMappings() {
$importer_config = feeds_importer($this->id)
->getConfig();
return $this
->filterMappings($importer_config['processor']['config']['mappings']);
}
/**
* Filters mappings, returning the ones that belong to us.
*
* @param array $mappings
* A mapping array from a processor.
*
* @return array
* An array of mappings keyed source => target.
*/
protected function filterMappings($mappings) {
$our_mappings = array();
foreach ($mappings as $mapping) {
if (strpos($mapping['source'], 'jsonpath_parser:') === 0) {
$our_mappings[$mapping['source']] = $mapping['target'];
}
}
return $our_mappings;
}
protected function debug($item, $source) {
if (in_array($source, $this->debug)) {
$o = '<ul>';
foreach ($item as $i) {
$o .= '<li>' . check_plain(var_export($i, TRUE)) . '</li>';
}
$o .= '</ul>';
drupal_set_message($source . ':' . $o);
}
}
/**
* Calls our filter hook.
*
* @param array &$item
* The item to alter.
* @param FeedsSource $source
* The feed source.
*
* @return true|null
* Returns true if the item should be skipped.
*/
protected function invokeHook(array &$item, FeedsSource $source) {
foreach (module_implements('feeds_jsonpath_parser_filter') as $module) {
$function = $module . '_feeds_jsonpath_parser_filter';
if ($function($item, $source) === TRUE) {
return TRUE;
}
}
}
/**
* Strips four byte characters from a string.
*
* @param string $string
* The input string.
*
* @return string
* The string with four byte characters removed.
*/
public static function stripFourBytes($string) {
return preg_replace(self::$fourByteRegex, '', $string);
}
/**
* Replaces four byte characters with their HTML unicode codepoint.
*
* @param string $string
* The input string.
*
* @return string
* The string with four byte characters converted.
*/
public static function convertFourBytes($string) {
return preg_replace_callback(self::$fourByteRegex, array(
'FeedsJSONPathParser',
'doFourByteReplace',
), $string);
}
/**
* Callback for FeedsJSONPathParser::convertFourBytes().
*
* @param array $matches
* The regular expression matches.
*
* @return string
* A four byte unicode character converted to its HTML representation.
*/
public static function doFourByteReplace(array $matches) {
$char = $matches[0];
// Calculate the codepoint of the character.
$codepoint = ord($char[0]) - 0xf0 << 18;
$codepoint += ord($char[1]) - 0x80 << 12;
$codepoint += ord($char[2]) - 0x80 << 6;
$codepoint += ord($char[3]) - 0x80;
return '&#' . $codepoint . ';';
}
}Classes
Name |
Description |
|---|---|
| FeedsJSONPathParser | Parses JSON using JSONPath. |