jsonpathstreamer's Introduction

JSON Path Streamer

Uses salsify/jsonstreamingparser to parse a JSON file, and stream its tokens. This package adds features to simplify that process.

In a very big JSON file, it's very important to know where the parser is, to know which few parts to keep. It provides an interface for that. For very simple JSON parsing, there's even a configurable method, without any more parse/JSON formatting logic.

See examples/ for more examples. Run examples/speed.php for a speed comparison.

DIY - Surgical precision

// MUST implement gotPath() and gotValue()
class MyListener extends \rdx\jsonpathstreamer\PathAwareJsonListener {
	public function gotPath(array $path) {
		// Ignore valueless paths (empty arrays etc)
	}

	public function gotValue(array $path, $value) {
		// Save only values within {"foo": {"bar": {...}}}
		if (array_slice($path, 0, 2) == ['foo', 'bar']) {
			// Ignore long "description" texts
			if (end($path) != 'description') {
				$this->rememberValue(array_slice($path, 2), $value);
			}
		}
	}

	// Optional
	public function stopAfter() {
		// Stop parsing after foo/bar because there's nothing I want there
		return ['#foo/bar/#'];
	}
}

Configurable - easy

// MUST implement getRules()
class MyListener extends \rdx\jsonpathstreamer\RegexConfigJsonListener {
	public function getRules() {
		// Save only "name", for all users into their original position
		return [
			'#^users/[^/]+/(name)(/|$)#',
			'#^offices/[^/]+/(name)(/|$)#',
		];
	}
}

Configurable - conversion

// MUST implement getRules()
class MyListener extends \rdx\jsonpathstreamer\RegexTargetConfigJsonListener {
	public function getRules() {
		// Save only "name", for all users and offices, into the same list
		return [
			'#^users/([^/]+)/(name)(/|$)#' => 'entities/$1/$2',
			'#^offices/([^/]+)/(name)(/|$)#' => 'entities/$1/$2',
		];
	}
}

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