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<?php

namespace Google\Cloud\Samples;

use ReflectionFunction;

function execute_sample(string $file, string $namespace, ?array $argv)

{

// Return if sample file is not being executed via CLI

if (is_null($argv)) {

return;

}

// Return if sample file is being included via PHPUnit

$argvFile = array_shift($argv);

if ('.php' != substr($argvFile, -4)) {

return;

}

// Determine the name of the function to execute

$functionName = sprintf('%s\\%s', $namespace, basename($file, '.php'));

// Verify the user has supplied the correct number of arguments

$functionReflection = new ReflectionFunction($functionName);

if (

count($argv) < $functionReflection->getNumberOfRequiredParameters()

|| count($argv) > $functionReflection->getNumberOfParameters()

) {

print(get_usage(basename($file), $functionReflection));

return;

}

// Require composer autoload for the user

$autoloadDir = dirname(dirname($functionReflection->getFileName()));

if (!file_exists($autoloadFile = $autoloadDir . '/vendor/autoload.php')) {

printf(

'You must run "composer install" in the sample root (%s/)' . PHP_EOL,

$autoloadDir

);

return;

}

require_once $autoloadFile;

// If any parameters are typehinted as "array", explode user input on ","

$validArrayTypes = ['array', 'array<string>', 'string[]'];

$parameterReflections = $functionReflection->getParameters();

foreach (array_values($argv) as $i => $val) {

$parameterReflection = $parameterReflections[$i];

if ($parameterReflection->hasType()) {

$parameterType = $parameterReflection->getType()->getName();

if (in_array($parameterType, $validArrayTypes)) {

$argv[$i] = explode(',', $argv[$i]);

}

}

}

// Run the function

call_user_func_array($functionName, $argv);

}

function get_usage(string $file, ReflectionFunction $functionReflection)

{

// Print basic usage

$paramNames = [];

foreach ($functionReflection->getParameters() as $param) {

$name = '$' . $param->getName();

if ($param->isOptional()) {

$default = var_export($param->getDefaultValue(), true);

$name = "[$name=$default]";

}

$paramNames[] = $name;

}

$usage = sprintf('Usage: %s %s' . PHP_EOL, $file, implode(' ', $paramNames));

// Print @param docs if they exist

preg_match_all(

"#(@param+\s*[a-zA-Z0-9, ()_].*)#",

$functionReflection->getDocComment(),

$matches

);

if (isset($matches[0])) {

$usage .= PHP_EOL . "\t";

$usage .= implode(PHP_EOL . "\t", $matches[0]) . PHP_EOL;

$usage .= PHP_EOL;

}

return $usage;

}