A string representing the street location
* 'additional' => A string for any additional portion of the street location
* 'city' => A string for the city name
* 'province' => The standard postal abbreviation for the province
* 'country' => The two-letter ISO code for the country of the location (REQUIRED)
* 'postal_code' => The international postal code for the location
*
* @return
* A link to a map provided by a third-party. The idea is to encode the appropriate
* parameters as HTTP GET variables to the URL.
*
* @ingroup Location
*/
function location_map_link($location = array(), $link_text = 'See map: ') {
if (!isset($location['country']) || $location['country'] == 'xx') {
return '';
}
location_load_country($location['country']);
$default_func = 'location_map_link_'. $location['country'] .'_default_providers';
$providers_func = 'location_map_link_'. $location['country'] .'_providers';
$providers = function_exists($providers_func) ? $providers_func() : array();
$selected_providers = variable_get('location_map_link_'. $location['country'], function_exists($default_func) ? $default_func() : array());
$links = array();
foreach ($selected_providers as $mapper) {
$link_func = 'location_map_link_'. $location['country'] .'_'. $mapper;
if (function_exists($link_func)) {
if ($link = $link_func($location)) {
$links[] = ''. $providers[$mapper]['name'] .'';
}
}
}
if (count($links)) {
return ''. t($link_text) . implode($links, ", ") .'
';
}
else {
return NULL;
}
}
/**
* Try to extract the the Latitude and Longitude data from the
* postal code.
*
* @param $location
* Array. the location data
* -> the values are:
* 'street' => the string representing the street location (REQUIRED)
* 'additional' => the string representing the additional street location portion in the location form
* 'city' => the city name (REQUIRED)
* 'province' => the province code defined in the country-specific include file
* 'country' => the lower-case of the two-letter ISO code (REQUIRED)
* 'postal_code' => the postal-code (REQUIRED)
*
* @return
* Array or NULL. NULL if the delegated-to function that does the
* actual look-up does not exist. If the appropriate function exists,
* then this function returns an associative array where
* 'lon' => A floating point number for the longitude coordinate of the parameter location
* 'lat' => A floating point number for the latitude coordinate of the parameter location
*
* @ingroup Location
*/
function location_get_postalcode_data($location = array()) {
$location['country'] = isset($location['country']) ? trim($location['country']) : NULL;
$location['postal_code'] = isset($location['postal_code']) ? trim($location['postal_code']) : NULL;
if (is_null($location['postal_code']) || is_null($location['country']) || empty($location['country']) || empty($location['postal_code']) || $location['postal_code'] == 'xx') {
return NULL;
}
location_load_country($location['country']);
$country_specific_function = 'location_get_postalcode_data_'. $location['country'];
if (function_exists($country_specific_function)) {
return $country_specific_function($location);
}
else {
return NULL;
}
}
/**
* Given two points in lat/lon form, returns the distance between them.
*
* @param $latlon_a
* An associative array where
* 'lon' => is a floating point of the longitude coordinate for the point given by latlonA
* 'lat' => is a floating point of the latitude coordinate for the point given by latlonB
*
* @param $latlon_b
* Another point formatted like $latlon_b
*
* @param $distance_unit
* A string that is either 'km' or 'mile'.
* If neither 'km' or 'mile' is passed, the parameter is forced to 'km'
*
* @return
* NULL if sense can't be made of the parameters.
* An associative array where
* 'scalar' => Is the distance between the two lat/lon parameter points
* 'distance_unit' => Is the unit of distance being represented by 'scalar'.
* This will be 'km' unless 'mile' is passed for the $distance_unit param
*
* @ingroup Location
*/
function location_distance_between($latlon_a = array(), $latlon_b = array(), $distance_unit = 'km') {
if (!isset($latlon_a['lon']) || !isset($latlon_a['lat']) || !isset($latlon_b['lon']) || !isset($latlon_b['lat'])) {
return NULL;
}
if ($distance_unit != 'km' && $distance_unit != 'mile') {
return NULL;
}
// $conversion_factor = number to divide by to convert meters to $distance_unit
// At this point, $distance_unit == 'km' or 'mile' and nothing else
//$conversion_factor = ($distance_unit == 'km') ? 1000.0 : 1609.347;
$meters = earth_distance($latlon_a['lon'], $latlon_a['lat'], $latlon_b['lon'], $latlon_b['lat']);
return array('scalar' => round($meters/(($distance_unit == 'km') ? 1000.0 : 1609.347), 1), 'distance_unit' => $distance_unit);
}
/**
* Takes two locations and tries to return a deep-link to driving directions.
*
* Parameters:
* @param $location_a
* An associative array that represents an location where
* 'street' => the street portions of the location
* 'additional' => additional street portion of the location
* 'city' => the city name
* 'province' => the province, state, or territory
* 'country' => lower-cased two-letter ISO code (REQUIRED)
* 'postal_code' => the postal code
*
* @param $location_b
* An associative array that represents an location in the same way that
* parameter $location_a does.
*
* @param $link_text
* The text of the HTML link that is to be generated.
*
* @return
* A deep-link to driving directions on Yahoo! or some other mapping service, if enough fields are filled in the parameters.
* A deep-link to a form for driving directions with information pre-filled if not enough, but some fields are filled in the parameters.
* The empty string if no information is provided (or if so little information is provided that there is no function to which to delegate
* the call.
*
* We dispatch the call to a country-specific function. The country-specific function, in this case,
* will be the one reflected by the country parameter of the first function. We require that
* both locationes supplied have a country field at the minimum.
*
* The country-specific functions will ultimately decide, with the parameters given, whether to
* to link to a form for driving directions is provided, where this form will be
* pre-populated with whatever values were available or whether to link directly to the driving
* directions themselves if enough fields are filled for each location.
*
* @ingroup Location
*/
function location_driving_directions_link($location_a = array(), $location_b = array(), $link_text = 'Get directions') {
if (!isset($location_a['country']) or !isset($location_b['country'])) {
return '';
}
// For now, return empty string if starting-point and destinations are in different countries
//if ($location_a['country'] != $location_b['country']) {
// return '';
//}
// Lines above commented out because I want to let the country-specific function of the departure point decide
// what it will do with driving destination locationes from other countries. As an example, Yahoo! Maps supports driving
// direction queries for locations between the U.S. and Canada.
$driving_direction_function = 'location_driving_directions_link_'. $location_a['country'];
if (function_exists($driving_direction_function)) {
$http_link = $driving_direction_function($location_a, $location_b);
if (strlen($http_link)) {
return ''. $link_text .'';
}
else {
return '';
}
}
return '';
}
/**
* @param $distance
* A number in either miles or km.
*
* @param $distance_unit
* String (optional). Either 'mile' or 'km' (default)
*
* @return
* A floating point number where the number in meters after the initially passed scalar has been ceil()'d
* This is done after the $distance_unit parmeter is forced to be 'km' or 'mile'
*/
function _location_convert_distance_to_meters($distance, $distance_unit = 'km') {
if (!is_numeric($distance)) {
return NULL;
}
if ($distance == 0) {
return NULL;
}
if ($distance_unit != 'km' && $distance_unit != 'mile') {
$distance_unit = 'km';
}
// Convert distance to meters
$retval = round(floatval($distance) * (($distance_unit == 'km') ? 1000.0 : 1609.347), 2);
return $retval;
}
/**
* Takes an location and returns a "rough" latitude/longitude pair based on the postal code
* data available for the given country.
*
* @param $location
* An associative array $location where
* 'street' => the street portion of the location
* 'additional' => additional street portion of the location
* 'province' => the province, state, or territory
* 'country' => lower-cased two-letter ISO code (REQUIRED)
* 'postal_code' => international postal code (REQUIRED)
*
* @return
* NULL if data cannont be found.
* Otherwise, an associative array where
* 'lat' => is a floating point of the latitude coordinate of this location
* 'lon' => is a floating point of the longitude coordinate of this location
*
* @ingroup Location
*/
function location_latlon_rough($location = array()) {
if (!isset($location['country']) || !isset($location['postal_code'])) {
return NULL;
}
location_load_country($location['country']);
$latlon_function = 'location_latlon_rough_'. $location['country'];
if (function_exists($latlon_function)) {
return $latlon_function($location);
}
else {
return location_latlon_rough_default($location);
}
}
/**
* Returns a lat/lon pair of the approximate center of the given postal code in the given country
* This function is a default implementation, in case the country support doesn't implement a proper function for this.
*
* @param $location
* An associative array $location where
* 'street' => the street portion of the location
* 'supplemental' => additional street portion of the location
* 'province' => the province, state, or territory
* 'country' => lower-cased two-letter ISO code (REQUIRED)
* 'postal_code' => the international postal code for this location (REQUIRED)
*
* @return
* An associative array where
* 'lat' => approximate latitude of the center of the postal code's area
* 'lon' => approximate longitude of the center of the postal code's area
*
*/
function location_latlon_rough_default($location = array()) {
if (!isset($location['country']) || !isset($location['postal_code'])) {
return NULL;
}
$result = db_query("SELECT latitude, longitude FROM {zipcodes} WHERE country = '%s' AND zip = '%s'", $location['country'], $location['postal_code']);
if ($row = db_fetch_object($result)) {
return array('lat' => $row->latitude, 'lon' => $row->longitude);
}
// if nothing found internally (new zipcode, or incomplete zipcodes table)
elseif (($newlatlong = location_latlon_exact($location)) != NULL) {
// try a one-time external geocoding
if ($newlatlong['lat']) {
// and store results in zipcodes table for next lookups being internally handled
// (yeah this is missing city/state info a.t.m., but is way better than nothing!)
$result = db_query("INSERT INTO {zipcodes} (latitude, longitude, country, zip) values ('%s', '%s', '%s', '%s')",
$newlatlong['lat'], $newlatlong['lon'], $location['country'], $location['postal_code']);
}
return $newlatlong;
}
else {
return NULL;
}
}
/**
* Get an appropriate bounding box for showing an entire country on a map.
* Target is a bounding box large enough to show the country in both spherical
* mercator and mercator projections.
* @param $location
* Either a location array or a country code.
*
* @return
* An array with 'minlng', 'minlat', 'maxlng', and 'maxlat' elements.
*/
function location_country_bounds($location = array()) {
if (!is_array($location)) {
$location = array('country' => $location);
}
if (!empty($location['country'])) {
location_load_country($location['country']);
}
$country_bounds_function = 'location_bounds_' . $location['country'];
if (function_exists($country_bounds_function)) {
return $country_bounds_function();
}
else {
return array(
'minlng' => -180.0,
'minlat' => -90.0,
'maxlng' => 180.0,
'maxlat' => 90.0,
);
}
}
/**
* Currently, this is not a priority until there is an implementable use for exact longitude,
* latitude coordinates for an location. The idea is that this call will eventually retrieve
* information through a web-service. Whereas location_latlon_rough() returns an approximate
* lat/lon pair based strictly on the postal code where this lat/lon pair is pulled from a
* database table, this function is intended to send the entire location to a web-service and
* to retrieve exact lat/lon coordinates.
*
* @param $location
* An array where
* -> the key values are 'street', 'additional', 'province', 'country', 'postal_code'
* -> the values are:
* 'street' => the string representing the street location (REQUIRED)
* 'additional' => the string representing the additional street location portion in the location form
* 'city' => the city name (REQUIRED)
* 'province' => the province code defined in the country-specific include file
* 'country' => the lower-case of the two-letter ISO code (REQUIRED)
* 'postal_code' => the postal-code (REQUIRED)
*
* @return
* NULL if the delegated-to function that does the actual look-up does not exist.
* If the appropriate function exists, then this function returns an associative array where
* 'lon' => A floating point number for the longitude coordinate of the parameter location
* 'lat' => A floating point number for the latitude coordinate of the parameter location
*
* @ingroup Location
*/
function location_latlon_exact($location = array()) {
$country = $location['country'];
location_standardize_country_code($country);
$service = variable_get('location_geocode_'. $country, 'none');
if (!empty($country) && $service != 'none') {
// figure out what the exact function should be
if (strpos($service, '|')) {
location_load_country($country);
// The code change below fixes the problem of the country specific
// function for geocoding not being correctly called (it removes any
// text from the pipe (|) onwards)
$exact_latlon_function = 'location_geocode_'. $country .'_'. substr($service, 0, strpos($service, '|'));
}
else {
location_load_geocoder($service);
$exact_latlon_function = $service .'_geocode_location';
}
if (function_exists($exact_latlon_function)) {
return $exact_latlon_function($location);
}
else {
return NULL;
}
}
return NULL;
}
/**
* Returns an associative array of countries currently supported
* by the location system where
* -> the keys represent the two-letter ISO code and
* -> the values represent the English name of the country.
* The array is sorted the index (i.e., by the short English name of the country).
*
* Please note the different between "supported" countries and "configured"
* countries: A country being "supported" means that there is an include file
* to support the country while "configure" implies that the site admin has
* configured the site to actually use that country.
*
* @ingroup Location
*/
function _location_supported_countries() {
static $supported_countries = array();
// If this function has already been called this request, we can avoid a DB hit.
if (!empty($supported_countries)) {
return $supported_countries;
}
// Try first to load from cache, it's much faster than the scan below.
if ($cache = cache_get('location:supported-countries', 'cache_location')) {
$supported_countries = $cache->data;
}
else {
// '' => ''
$iso_list = location_get_iso3166_list();
$path = drupal_get_path('module', 'location') .'/supported/location.';
foreach ($iso_list as $cc => $name) {
if (file_exists($path . $cc .'.inc')) {
$supported_countries[$cc] = $name;
}
}
cache_set('location:supported-countries', $supported_countries, 'cache_location');
}
return $supported_countries;
}
// @@@ New in 3.x, document.
/**
* Fetch the provinces for a country.
*/
function location_get_provinces($country = 'us') {
static $provinces = array();
location_standardize_country_code($country);
if (isset($provinces[$country])) {
return $provinces[$country];
}
if ($cache = cache_get("provinces:$country", 'cache_location')) {
$provinces[$country] = $cache->data;
return $provinces[$country];
}
location_load_country($country);
$func = 'location_province_list_'. $country;
if (function_exists($func)) {
$provinces[$country] = $func();
cache_set("provinces:$country", $provinces[$country], 'cache_location');
return $provinces[$country];
}
return array();
}
// @@@ New in 3.x, document.
/**
* Get the translated name of a country code.
*/
function location_country_name($country = 'us') {
location_standardize_country_code($country);
$countries = location_get_iso3166_list();
if (isset($countries[$country])) {
return $countries[$country];
}
else {
return '';
}
}
// @@@ New in 3.x, document.
/**
* Get the full name of a province code.
*/
function location_province_name($country = 'us', $province = 'xx') {
$provinces = location_get_provinces($country);
$province = strtoupper($province);
if (isset($provinces[$province])) {
return $provinces[$province];
}
else {
return '';
}
}
// @@@ New in 3.x, document.
/**
* Get a province code from a code or full name and a country.
*/
function location_province_code($country = 'us', $province = 'xx') {
// An array of countries is useful if someone specified multiple countries
// in an autoselect for example.
// It *is* possibly ambiguous, especially if the province was already a code.
// We make an array here for single (the usual case) for code simplicity reasons.
if (!is_array($country)) {
$country = array($country);
}
$p = strtoupper($province);
foreach ($country as $c) {
$provinces = location_get_provinces($c);
foreach ($provinces as $k => $v) {
if ($p == strtoupper($k) || $p == strtoupper($v)) {
return $k;
}
}
}
return '';
}
// @@@ New in 3.x, document.
/**
* Canonicalize a country code.
*/
function location_standardize_country_code(&$country) {
$country = trim($country);
// @@@ Double check the validity of this validity check. ;)
if (!ctype_alpha($country) || strlen($country) != 2) {
$country = 'xx';
return FALSE;
}
else {
$country = strtolower($country);
return TRUE;
}
}
/**
* Load support for a country.
*
* This function will load support for a country identified by its two-letter ISO code.
*
* @param $country
* Two-letter ISO code for country.
*
* @return
* TRUE if the file was found and loaded, FALSE otherwise.
*/
function location_load_country($country) {
location_standardize_country_code($country);
$file = drupal_get_path('module', 'location') . '/supported/location.' . $country . '.inc';
if (file_exists($file)) {
include_once($file);
return TRUE;
}
return FALSE;
}
// @@@ New in 3.x, document.
/**
* Load a general geocoding service.
*/
function location_load_geocoder($geocoder) {
include_once drupal_get_path('module', 'location') .'/geocoding/'. $geocoder .'.inc';
}
/**
* Create a single line address.
*
* @param $location
* Array. The address parts
* @return
* String. The single line address
*/
function location_address2singleline($location = array()) {
// Check if its a valid address
if (empty($location)) {
return '';
}
$address = '';
if (!empty($location['street'])) {
$address .= $location['street'];
}
if (!empty($location['city'])) {
if (!empty($location['street'])) {
$address .= ', ';
}
$address .= $location['city'];
}
if (!empty($location['province'])) {
if (!empty($location['street']) || !empty($location['city'])) {
$address .= ', ';
}
// @@@ Fix this!
if (substr($location['province'], 0, 3) == $location['country'] .'-') {
$address .= substr($location['province'], 3);
watchdog('Location', 'BUG: Country found in province attribute.');
}
else {
$address .= $location['province'];
}
}
if (!empty($location['postal_code'])) {
if (!empty($address)) {
$address .= ' ';
}
$address .= $location['postal_code'];
}
if (!empty($location['country'])) {
$address .= ', '. $location['country'];
}
return $address;
}
function location_get_general_geocoder_list() {
static $list;
if (!count($list)) {
$files = file_scan_directory(drupal_get_path('module', 'location') .'/geocoding', '/\.inc$/', array('nomask' => '/(\.\.?|CVS|\.svn)$/'));
foreach ($files as $full_path_name => $fileinfo) {
$list[] = $fileinfo->name;
}
}
return $list;
}
/**
* The following is an array of all
* countrycode => country-name pairs as layed out in
* ISO 3166-1 alpha-2
*/
function location_get_iso3166_list($upper = FALSE) {
include_once DRUPAL_ROOT .'/includes/locale.inc';
$countries = country_get_list();
if (empty($upper)) {
return array_change_key_case($countries, CASE_LOWER);
}
return $countries;
}