--- /dev/null
+<?php
+
+namespace Grasmash\YamlExpander;
+
+use Dflydev\DotAccessData\Data;
+use Symfony\Component\Yaml\Yaml;
+
+/**
+ * Class Expander
+ * @package Grasmash\YamlExpander
+ */
+class Expander
+{
+
+ /**
+ * Parses a YAML string and expands property placeholders.
+ *
+ * Placeholders should formatted as ${parent.child}.
+ *
+ * @param string $yaml_string
+ * A string of YAML.
+ * @param array $reference_array
+ * Optional. An array of reference values. This is not operated upon but is used as a
+ * reference to provide supplemental values for property expansion.
+ *
+ * @return array
+ * The modified array in which placeholders have been replaced with
+ * values.
+ */
+ public static function parse($yaml_string, $reference_array = [])
+ {
+ $array = Yaml::parse($yaml_string);
+ return self::expandArrayProperties($array, $reference_array);
+ }
+
+
+ /**
+ * Expands property placeholders in an array.
+ *
+ * Placeholders should formatted as ${parent.child}.
+ *
+ * @param array $array
+ * An array containing properties to expand.
+ *
+ * @return array
+ * The modified array in which placeholders have been replaced with
+ * values.
+ */
+ public static function expandArrayProperties($array, $reference_array = [])
+ {
+ $data = new Data($array);
+ if ($reference_array) {
+ $reference_data = new Data($reference_array);
+ self::doExpandArrayProperties($data, $array, '', $reference_data);
+ } else {
+ self::doExpandArrayProperties($data, $array);
+ }
+
+ return $data->export();
+ }
+
+ /**
+ * Performs the actual property expansion.
+ *
+ * @param Data $data
+ * A data object, containing the $array.
+ * @param array $array
+ * The original, unmodified array.
+ * @param string $parent_keys
+ * The parent keys of the current key in dot notation. This is used to
+ * track the absolute path to the current key in recursive cases.
+ * @param Data|null $reference_data
+ * A reference data object. This is not operated upon but is used as a
+ * reference to provide supplemental values for property expansion.
+ */
+ protected static function doExpandArrayProperties(
+ $data,
+ $array,
+ $parent_keys = '',
+ $reference_data = null
+ ) {
+ foreach ($array as $key => $value) {
+ // Boundary condition(s).
+ if (is_null($value) || is_bool($value)) {
+ continue;
+ }
+ // Recursive case.
+ if (is_array($value)) {
+ self::doExpandArrayProperties($data, $value, $parent_keys . "$key.", $reference_data);
+ } // Base case.
+ else {
+ self::expandStringProperties($data, $parent_keys, $reference_data, $value, $key);
+ }
+ }
+ }
+
+ /**
+ * Expand a single property.
+ *
+ * @param Data $data
+ * A data object, containing the $array.
+ * @param string $parent_keys
+ * The parent keys of the current key in dot notation. This is used to
+ * track the absolute path to the current key in recursive cases.
+ * @param Data|null $reference_data
+ * A reference data object. This is not operated upon but is used as a
+ * reference to provide supplemental values for property expansion.
+ * @param string $value
+ * The unexpanded property value.
+ * @param string $key
+ * The immediate key of the property.
+ *
+ * @return mixed
+ */
+ protected static function expandStringProperties(
+ $data,
+ $parent_keys,
+ $reference_data,
+ $value,
+ $key
+ ) {
+ // We loop through all placeholders in a given string.
+ // E.g., '${placeholder1} ${placeholder2}' requires two replacements.
+ while (strpos($value, '${') !== false) {
+ $original_value = $value;
+ $value = preg_replace_callback(
+ '/\$\{([^\$}]+)\}/',
+ function ($matches) use ($data, $reference_data) {
+ return self::expandStringPropertiesCallback(
+ $matches,
+ $data,
+ $reference_data
+ );
+ },
+ $value
+ );
+
+ // If no replacement occurred at all, break to prevent
+ // infinite loop.
+ if ($original_value == $value) {
+ break;
+ }
+
+ // Set value on $data object.
+ if ($parent_keys) {
+ $full_key = $parent_keys . "$key";
+ } else {
+ $full_key = $key;
+ }
+ $data->set($full_key, $value);
+ }
+ return $value;
+ }
+
+ /**
+ * Expansion callback used by preg_replace_callback() in expandProperty().
+ *
+ * @param array $matches
+ * An array of matches created by preg_replace_callback().
+ * @param Data $data
+ * A data object containing the complete array being operated upon.
+ * @param Data|null $reference_data
+ * A reference data object. This is not operated upon but is used as a
+ * reference to provide supplemental values for property expansion.
+ *
+ * @return mixed
+ */
+ public static function expandStringPropertiesCallback(
+ $matches,
+ $data,
+ $reference_data = null
+ ) {
+ $property_name = $matches[1];
+ $unexpanded_value = $matches[0];
+
+ // Use only values within the subject array's data.
+ if (!$reference_data) {
+ return self::expandProperty($property_name, $unexpanded_value, $data);
+ } // Search both the subject array's data and the reference data for a value.
+ else {
+ return self::expandPropertyWithReferenceData(
+ $property_name,
+ $unexpanded_value,
+ $data,
+ $reference_data
+ );
+ }
+ }
+
+ /**
+ * Searches both the subject data and the reference data for value.
+ *
+ * @param string $property_name
+ * The name of the value for which to search.
+ * @param string $unexpanded_value
+ * The original, unexpanded value, containing the placeholder.
+ * @param Data $data
+ * A data object containing the complete array being operated upon.
+ * @param Data|null $reference_data
+ * A reference data object. This is not operated upon but is used as a
+ * reference to provide supplemental values for property expansion.
+ *
+ * @return string
+ * The expanded string.
+ */
+ public static function expandPropertyWithReferenceData(
+ $property_name,
+ $unexpanded_value,
+ $data,
+ $reference_data
+ ) {
+ $expanded_value = self::expandProperty(
+ $property_name,
+ $unexpanded_value,
+ $data
+ );
+ // If the string was not changed using the subject data, try using
+ // the reference data.
+ if ($expanded_value == $unexpanded_value) {
+ $expanded_value = self::expandProperty(
+ $property_name,
+ $unexpanded_value,
+ $reference_data
+ );
+ }
+
+ return $expanded_value;
+ }
+
+ /**
+ * Searches a data object for a value.
+ *
+ * @param string $property_name
+ * The name of the value for which to search.
+ * @param string $unexpanded_value
+ * The original, unexpanded value, containing the placeholder.
+ * @param Data $data
+ * A data object containing possible replacement values.
+ *
+ * @return mixed
+ */
+ public static function expandProperty($property_name, $unexpanded_value, $data)
+ {
+ if (strpos($property_name, "env.") === 0 &&
+ !$data->has($property_name)) {
+ $env_key = substr($property_name, 4);
+ if (getenv($env_key)) {
+ $data->set($property_name, getenv($env_key));
+ }
+ }
+
+ if (!$data->has($property_name)) {
+ self::log("Property \${'$property_name'} could not be expanded.");
+ return $unexpanded_value;
+ } else {
+ $expanded_value = $data->get($property_name);
+ if (is_array($expanded_value)) {
+ $expanded_value = Yaml::dump($expanded_value, 0);
+ return $expanded_value;
+ }
+ self::log("Expanding property \${'$property_name'} => $expanded_value.");
+ return $expanded_value;
+ }
+ }
+
+ /**
+ * @param $message
+ */
+ public static function log($message)
+ {
+ // print "$message\n";
+ }
+}
projects / yaffs-website / blobdiff