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<?php
namespace Parsers;
use ReflectionFunction;
class FunctionParser implements ParserInterface {
private static $functions = [];
#===============================================================================
# Main regex for matching the whole function call
#===============================================================================
private const FUNCTION_PATTERN = '/
\{\s? # Opening curly brace `{`
(?<func>%s) # The function name in uppercase letters
(?:\:\s # A colon `:` followed by a required blank
(?<arg_list> # Capture group for the whole argument list
(?:%s)+ # One or more arguments (ARGUMENT_PATTERN_PARTIAL)
)
)?
\s?\} # Closing curly brace `}`
/x';
#===============================================================================
# Partial regex for matching/splitting the argument list
# - Thanks to @OnlineCop from the #regex community of the Libera IRC network! <3
#===============================================================================
private const ARGUMENT_PATTERN_PARTIAL =
'(?<arg> # Either a quoted string or a plain number
(?<qmark>["\']) # Either a single or double quote
(?>[^"\'\\\]++ # String between the quotes
| [\\\]. # A `\` followed by anything but literal newline
| (?!\k<qmark>)["\'] # A quote, but not our opening quote
)*+
\k<qmark> # Closing quote (same as opening quote)
|
[0-9]+ # ... or just a plain number
)
(?:,\s*)?';
#===============================================================================
# Register function
#===============================================================================
public static function register(string $name, callable $callback): void {
$Function = new ReflectionFunction($callback);
self::$functions[$name] = [
'callback' => $callback,
'required' => $Function->getNumberOfRequiredParameters()
];
}
#===============================================================================
# Parse functions
#===============================================================================
public function parse(string $text): array {
$functionNames = array_keys(self::$functions);
$functionNames = implode('|', $functionNames);
$pattern = self::FUNCTION_PATTERN;
$options = self::ARGUMENT_PATTERN_PARTIAL;
preg_match_all(sprintf($pattern, $functionNames, $options), $text, $matches);
foreach(array_map(function($name, $parameters) {
return [$name , $this->parseParameterString($parameters)];
}, $matches['func'], $matches['arg_list']) as $match) {
$functions[$match[0]][] = $match[1];
}
return $functions ?? [];
}
#===============================================================================
# Transform functions
#===============================================================================
public function transform(string $text): string {
$functionData = self::$functions;
$functionNames = array_keys($functionData);
$functionNames = implode('|', $functionNames);
$pattern = self::FUNCTION_PATTERN;
$options = self::ARGUMENT_PATTERN_PARTIAL;
return preg_replace_callback(sprintf($pattern, $functionNames, $options),
function($matches) use($functionData) {
$function = $matches['func'];
$callback = $functionData[$function]['callback'];
$required = $functionData[$function]['required'];
$arguments = $this->parseParameterString($matches['arg_list'] ?? '');
if(count($arguments) < $required) {
return sprintf('`{%s: *Missing arguments*}`', $function);
}
return $callback(...$arguments);
}, $text);
}
#===============================================================================
# Parse the parameter string found within the function shell
#===============================================================================
private function parseParameterString(string $parameters): array {
$pattern = sprintf('/%s/x', self::ARGUMENT_PATTERN_PARTIAL);
preg_match_all($pattern, $parameters, $matches);
return array_map(function($arg, $qmark) {
if(!$qmark) {
return $arg;
}
# If a quotation mark is matched, the argument has been enclosed
# between quotation marks when passed to the content function in
# the editor. Therefore, the quotation marks must be removed and
# we also need to take care of the backslash-escaped occurrences
# of the quotation marks inside the argument string.
$arg = substr($arg, 1);
$arg = substr($arg, 0, strlen($arg)-1);
$arg = str_replace('\\'.$qmark, $qmark, $arg);
return $arg;
}, $matches['arg'], $matches['qmark']);
}
}
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