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efrain |
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<?php
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namespace JmesPath;
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/**
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* Compiles JMESPath expressions to PHP source code and executes it.
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*
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* JMESPath file names are stored in the cache directory using the following
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* logic to determine the filename:
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*
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* 1. Start with the string "jmespath_"
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* 2. Append the MD5 checksum of the expression.
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* 3. Append ".php"
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*/
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class CompilerRuntime
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{
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private $parser;
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private $compiler;
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private $cacheDir;
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private $interpreter;
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/**
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* @param string|null $dir Directory used to store compiled PHP files.
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* @param Parser|null $parser JMESPath parser to utilize
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* @throws \RuntimeException if the cache directory cannot be created
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*/
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public function __construct($dir = null, Parser $parser = null)
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{
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$this->parser = $parser ?: new Parser();
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$this->compiler = new TreeCompiler();
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$dir = $dir ?: sys_get_temp_dir();
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if (!is_dir($dir) && !mkdir($dir, 0755, true)) {
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throw new \RuntimeException("Unable to create cache directory: $dir");
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}
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$this->cacheDir = realpath($dir);
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$this->interpreter = new TreeInterpreter();
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}
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/**
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* Returns data from the provided input that matches a given JMESPath
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* expression.
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*
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* @param string $expression JMESPath expression to evaluate
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* @param mixed $data Data to search. This data should be data that
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* is similar to data returned from json_decode
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* using associative arrays rather than objects.
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*
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* @return mixed Returns the matching data or null
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* @throws \RuntimeException
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*/
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public function __invoke($expression, $data)
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{
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$functionName = 'jmespath_' . md5($expression);
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if (!function_exists($functionName)) {
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$filename = "{$this->cacheDir}/{$functionName}.php";
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if (!file_exists($filename)) {
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$this->compile($filename, $expression, $functionName);
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}
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require $filename;
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}
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return $functionName($this->interpreter, $data);
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}
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private function compile($filename, $expression, $functionName)
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{
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$code = $this->compiler->visit(
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$this->parser->parse($expression),
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$functionName,
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$expression
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);
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if (!file_put_contents($filename, $code)) {
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throw new \RuntimeException(sprintf(
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'Unable to write the compiled PHP code to: %s (%s)',
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$filename,
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var_export(error_get_last(), true)
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));
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}
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}
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}
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