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<?php
namespace Laminas\I18n\Translator\Plural;
use Laminas\I18n\Exception;
use function ctype_digit;
use function max;
use function sprintf;
/**
* Plural rule parser.
*
* This plural rule parser is implemented after the article "Top Down Operator
* Precedence" described in <http://javascript.crockford.com/tdop/tdop.html>.
*/
class Parser
{
/**
* String to parse.
*
* @var string
*/
protected $string;
/**
* Current lexer position in the string.
*
* @var int
*/
protected $currentPos;
/**
* Current token.
*
* @var Symbol
*/
protected $currentToken;
/**
* Table of symbols.
*
* @var Symbol[]
*/
protected $symbolTable = [];
/**
* Create a new plural parser.
*/
public function __construct()
{
$this->populateSymbolTable();
}
/**
* Populate the symbol table.
*
* @return void
*/
protected function populateSymbolTable()
{
// Ternary operators
$this->registerSymbol('?', 20)->setLeftDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static function (Symbol $self, Symbol $left) {
$self->first = $left;
$self->second = $self->parser->expression();
$self->parser->advance(':');
$self->third = $self->parser->expression();
return $self;
}
// @codingStandardsIgnoreEnd
);
$this->registerSymbol(':');
// Boolean operators
$this->registerLeftInfixSymbol('||', 30);
$this->registerLeftInfixSymbol('&&', 40);
// Equal operators
$this->registerLeftInfixSymbol('==', 50);
$this->registerLeftInfixSymbol('!=', 50);
// Compare operators
$this->registerLeftInfixSymbol('>', 50);
$this->registerLeftInfixSymbol('<', 50);
$this->registerLeftInfixSymbol('>=', 50);
$this->registerLeftInfixSymbol('<=', 50);
// Add operators
$this->registerLeftInfixSymbol('-', 60);
$this->registerLeftInfixSymbol('+', 60);
// Multiply operators
$this->registerLeftInfixSymbol('*', 70);
$this->registerLeftInfixSymbol('/', 70);
$this->registerLeftInfixSymbol('%', 70);
// Not operator
$this->registerPrefixSymbol('!', 80);
// Literals
$this->registerSymbol('n')->setNullDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static fn(Symbol $self) => $self
// @codingStandardsIgnoreEnd
);
$this->registerSymbol('number')->setNullDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static fn(Symbol $self) => $self
// @codingStandardsIgnoreEnd
);
// Parentheses
$this->registerSymbol('(')->setNullDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static function (Symbol $self) {
$expression = $self->parser->expression();
$self->parser->advance(')');
return $expression;
}
// @codingStandardsIgnoreEnd
);
$this->registerSymbol(')');
// Eof
$this->registerSymbol('eof');
}
/**
* Register a left infix symbol.
*
* @param string $id
* @param int $leftBindingPower
* @return void
*/
protected function registerLeftInfixSymbol($id, $leftBindingPower)
{
$this->registerSymbol($id, $leftBindingPower)->setLeftDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static function (Symbol $self, Symbol $left) use ($leftBindingPower) {
$self->first = $left;
$self->second = $self->parser->expression($leftBindingPower);
return $self;
}
// @codingStandardsIgnoreEnd
);
}
/**
* Register a right infix symbol.
*
* @param string $id
* @param int $leftBindingPower
* @return void
*/
protected function registerRightInfixSymbol($id, $leftBindingPower)
{
$this->registerSymbol($id, $leftBindingPower)->setLeftDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static function (Symbol $self, Symbol $left) use ($leftBindingPower) {
$self->first = $left;
$self->second = $self->parser->expression($leftBindingPower - 1);
return $self;
}
// @codingStandardsIgnoreEnd
);
}
/**
* Register a prefix symbol.
*
* @param string $id
* @param int $leftBindingPower
* @return void
*/
protected function registerPrefixSymbol($id, $leftBindingPower)
{
$this->registerSymbol($id, $leftBindingPower)->setNullDenotationGetter(
// @codingStandardsIgnoreStart Generic.WhiteSpace.ScopeIndent.IncorrectExact
static function (Symbol $self) use ($leftBindingPower) {
$self->first = $self->parser->expression($leftBindingPower);
$self->second = null;
return $self;
}
// @codingStandardsIgnoreEnd
);
}
/**
* Register a symbol.
*
* @param string $id
* @param int $leftBindingPower
* @return Symbol
*/
protected function registerSymbol($id, $leftBindingPower = 0)
{
if (isset($this->symbolTable[$id])) {
$symbol = $this->symbolTable[$id];
$symbol->leftBindingPower = max(
$symbol->leftBindingPower,
$leftBindingPower
);
} else {
$symbol = new Symbol($this, $id, $leftBindingPower);
$this->symbolTable[$id] = $symbol;
}
return $symbol;
}
/**
* Get a new symbol.
*
* @param string $id
* @return Symbol
*/
protected function getSymbol($id)
{
if (! isset($this->symbolTable[$id])) { // phpcs:ignore
// Unknown symbol exception
}
return clone $this->symbolTable[$id];
}
/**
* Parse a string.
*
* @param string $string
* @return Symbol
*/
public function parse($string)
{
$this->string = $string . "\0";
$this->currentPos = 0;
$this->currentToken = $this->getNextToken();
return $this->expression();
}
/**
* Parse an expression.
*
* @param int $rightBindingPower
* @return Symbol
*/
public function expression($rightBindingPower = 0)
{
$token = $this->currentToken;
$this->currentToken = $this->getNextToken();
$left = $token->getNullDenotation();
while ($rightBindingPower < $this->currentToken->leftBindingPower) {
$token = $this->currentToken;
$this->currentToken = $this->getNextToken();
$left = $token->getLeftDenotation($left);
}
return $left;
}
/**
* Advance the current token and optionally check the old token id.
*
* @param string $id
* @return void
* @throws Exception\ParseException
*/
public function advance($id = null)
{
if ($id !== null && $this->currentToken->id !== $id) {
throw new Exception\ParseException(
sprintf('Expected token with id %s but received %s', $id, $this->currentToken->id)
);
}
$this->currentToken = $this->getNextToken();
}
/**
* Get the next token.
*
* @return Symbol
* @throws Exception\ParseException
*/
protected function getNextToken()
{
while ($this->string[$this->currentPos] === ' ' || $this->string[$this->currentPos] === "\t") {
$this->currentPos++;
}
$result = $this->string[$this->currentPos++];
$value = null;
switch ($result) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
while (ctype_digit($this->string[$this->currentPos])) {
$result .= $this->string[$this->currentPos++];
}
$id = 'number';
$value = (int) $result;
break;
case '=':
case '&':
case '|':
if ($this->string[$this->currentPos] === $result) {
$this->currentPos++;
$id = $result . $result;
} else { // phpcs:ignore
// Yield error
}
break;
case '!':
case '<':
case '>':
if ($this->string[$this->currentPos] === '=') {
$this->currentPos++;
$result .= '=';
}
$id = $result;
break;
case '*':
case '/':
case '%':
case '+':
case '-':
case 'n':
case '?':
case ':':
case '(':
case ')':
$id = $result;
break;
case ';':
case "\n":
case "\0":
$id = 'eof';
$this->currentPos--;
break;
default:
throw new Exception\ParseException(sprintf(
'Found invalid character "%s" in input stream',
$result
));
}
$token = $this->getSymbol($id);
$token->value = $value;
return $token;
}
}