You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
222 lines
5.8 KiB
222 lines
5.8 KiB
<?php
|
|
/** @license MIT
|
|
* Copyright 2021 Dustin Wilson et al.
|
|
* See LICENSE and AUTHORS files for details */
|
|
|
|
declare(strict_types=1);
|
|
namespace dW\Highlighter\Scope;
|
|
|
|
class Parser {
|
|
public static bool $debug = false;
|
|
|
|
protected Data $data;
|
|
protected int $debugCount = 1;
|
|
|
|
protected static Parser $instance;
|
|
protected const SCOPE_REGEX = '/^[A-Za-z0-9-+_\.\*]+$/S';
|
|
|
|
|
|
public static function parse(string $selector): Matcher|false {
|
|
self::$instance = new self($selector);
|
|
return self::parseSelector();
|
|
}
|
|
|
|
|
|
protected function __construct(string $selector) {
|
|
$this->data = new Data($selector);
|
|
}
|
|
|
|
protected static function parseComposite(): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$result = self::parseExpression();
|
|
|
|
$peek = self::$instance->data->peek();
|
|
while (in_array($peek, [ '|', '&', '-' ])) {
|
|
$token = self::$instance->data->consume();
|
|
$new = self::parseExpression();
|
|
|
|
switch ($token) {
|
|
case '|':
|
|
if ($result instanceof OrMatcher) {
|
|
$result = $result->add($new);
|
|
}
|
|
|
|
$result = new OrMatcher($result, $new);
|
|
break;
|
|
|
|
case '-':
|
|
$new = new NegateMatcher($new);
|
|
case '&':
|
|
if ($result instanceof AndMatcher) {
|
|
$result = $result->add($new);
|
|
}
|
|
|
|
$result = new AndMatcher($result, $new);
|
|
break;
|
|
}
|
|
|
|
$peek = self::$instance->data->peek();
|
|
}
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function parseExpression(): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$peek = self::$instance->data->peek();
|
|
$prefix = null;
|
|
if (in_array($peek[0], [ 'B', 'L', 'R' ]) && $peek[1] === ':') {
|
|
$prefix = $peek[0];
|
|
self::$instance->data->consume();
|
|
}
|
|
|
|
$peek = self::$instance->data->peek();
|
|
if ($peek === '(') {
|
|
self::$instance->data->consume();
|
|
$result = self::parseGroup($prefix);
|
|
} elseif (preg_match(self::SCOPE_REGEX, $peek)) {
|
|
$result = self::parsePath($prefix);
|
|
} else {
|
|
die('Group or path expected.');
|
|
}
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function parseGroup(string|null $prefix = null): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$result = self::parseSelector();
|
|
if (self::$instance->data->consume() !== ')') {
|
|
die('Close parenthesis expected');
|
|
}
|
|
|
|
$result = ($prefix === null) ? $result : new GroupMatcher($prefix, $result);
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function parsePath(string|null $prefix = null): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$result = [];
|
|
$result[] = self::parseScope();
|
|
|
|
$peek = self::$instance->data->peek();
|
|
while ($peek != '-' && preg_match(self::SCOPE_REGEX, $peek)) {
|
|
self::$instance->data->consume();
|
|
$result[] = self::parseScope();
|
|
$peek = self::$instance->data->peek();
|
|
}
|
|
|
|
$result = ($prefix !== null || count($result) > 1) ? new PathMatcher($prefix, ...$result) : $result[0];
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function parseSelector(): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$result = [];
|
|
$result[] = self::parseComposite();
|
|
|
|
$peek = self::$instance->data->peek();
|
|
while ($peek === ',') {
|
|
self::$instance->data->consume();
|
|
$result[] = self::parseComposite();
|
|
$peek = self::$instance->data->peek();
|
|
}
|
|
|
|
$result = (count($result) > 1) ? new OrMatcher(...$result) : $result[0];
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function parseScope(): Matcher {
|
|
if (self::$debug) {
|
|
self::debug();
|
|
}
|
|
|
|
$token = self::$instance->data->consume();
|
|
if (!preg_match('/^(?:[A-Za-z0-9-_]+|\*)(?:\.(?:[A-Za-z0-9-+_]+|\*))*$/S', $token)) {
|
|
die('Invalid scope');
|
|
}
|
|
|
|
$segments = explode('.', $token);
|
|
foreach ($segments as $index => $segment) {
|
|
$segments[$index] = ($segment !== '*') ? new SegmentMatcher($segment) : new TrueMatcher();
|
|
}
|
|
|
|
$result = new ScopeMatcher(...$segments);
|
|
|
|
if (self::$debug) {
|
|
self::debugResult($result);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
protected static function debug() {
|
|
$message = <<<DEBUG
|
|
------------------------------
|
|
%s
|
|
Method: %s
|
|
Position: %s
|
|
Token: %s
|
|
|
|
DEBUG;
|
|
|
|
$methodTree = '';
|
|
$backtrace = debug_backtrace();
|
|
array_shift($backtrace);
|
|
array_pop($backtrace);
|
|
foreach ($backtrace as $b) {
|
|
$methodTree = "->{$b['function']}$methodTree";
|
|
}
|
|
|
|
printf($message,
|
|
self::$instance->debugCount++,
|
|
ltrim($methodTree, '->'),
|
|
self::$instance->data->position + 1,
|
|
var_export(self::$instance->data->peek(), true)
|
|
);
|
|
}
|
|
|
|
protected static function debugResult($result) {
|
|
printf("%s Result: %s\n",
|
|
debug_backtrace()[1]['function'],
|
|
var_export($result, true));
|
|
}
|
|
}
|
|
|