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<?php declare(strict_types = 1);
namespace PHPStan\PhpDocParser\Parser;
use PHPStan\PhpDocParser\Ast;
use PHPStan\PhpDocParser\Lexer\Lexer;
use PHPStan\PhpDocParser\ParserConfig;
use function str_replace;
use function strtolower;
class ConstExprParser
{
private ParserConfig $config;
private bool $parseDoctrineStrings;
public function __construct(
ParserConfig $config
)
{
$this->config = $config;
$this->parseDoctrineStrings = false;
}
/**
* @internal
*/
public function toDoctrine(): self
{
$self = new self($this->config);
$self->parseDoctrineStrings = true;
return $self;
}
public function parse(TokenIterator $tokens): Ast\ConstExpr\ConstExprNode
{
$startLine = $tokens->currentTokenLine();
$startIndex = $tokens->currentTokenIndex();
if ($tokens->isCurrentTokenType(Lexer::TOKEN_FLOAT)) {
$value = $tokens->currentTokenValue();
$tokens->next();
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprFloatNode(str_replace('_', '', $value)),
$startLine,
$startIndex,
);
}
if ($tokens->isCurrentTokenType(Lexer::TOKEN_INTEGER)) {
$value = $tokens->currentTokenValue();
$tokens->next();
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprIntegerNode(str_replace('_', '', $value)),
$startLine,
$startIndex,
);
}
if ($this->parseDoctrineStrings && $tokens->isCurrentTokenType(Lexer::TOKEN_DOCTRINE_ANNOTATION_STRING)) {
$value = $tokens->currentTokenValue();
$tokens->next();
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\DoctrineConstExprStringNode(Ast\ConstExpr\DoctrineConstExprStringNode::unescape($value)),
$startLine,
$startIndex,
);
}
if ($tokens->isCurrentTokenType(Lexer::TOKEN_SINGLE_QUOTED_STRING, Lexer::TOKEN_DOUBLE_QUOTED_STRING)) {
if ($this->parseDoctrineStrings) {
if ($tokens->isCurrentTokenType(Lexer::TOKEN_SINGLE_QUOTED_STRING)) {
throw new ParserException(
$tokens->currentTokenValue(),
$tokens->currentTokenType(),
$tokens->currentTokenOffset(),
Lexer::TOKEN_DOUBLE_QUOTED_STRING,
null,
$tokens->currentTokenLine(),
);
}
$value = $tokens->currentTokenValue();
$tokens->next();
return $this->enrichWithAttributes(
$tokens,
$this->parseDoctrineString($value, $tokens),
$startLine,
$startIndex,
);
}
$value = StringUnescaper::unescapeString($tokens->currentTokenValue());
$type = $tokens->currentTokenType();
$tokens->next();
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprStringNode(
$value,
$type === Lexer::TOKEN_SINGLE_QUOTED_STRING
? Ast\ConstExpr\ConstExprStringNode::SINGLE_QUOTED
: Ast\ConstExpr\ConstExprStringNode::DOUBLE_QUOTED,
),
$startLine,
$startIndex,
);
} elseif ($tokens->isCurrentTokenType(Lexer::TOKEN_IDENTIFIER)) {
$identifier = $tokens->currentTokenValue();
$tokens->next();
switch (strtolower($identifier)) {
case 'true':
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprTrueNode(),
$startLine,
$startIndex,
);
case 'false':
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprFalseNode(),
$startLine,
$startIndex,
);
case 'null':
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprNullNode(),
$startLine,
$startIndex,
);
case 'array':
$tokens->consumeTokenType(Lexer::TOKEN_OPEN_PARENTHESES);
return $this->parseArray($tokens, Lexer::TOKEN_CLOSE_PARENTHESES, $startIndex);
}
if ($tokens->tryConsumeTokenType(Lexer::TOKEN_DOUBLE_COLON)) {
$classConstantName = '';
$lastType = null;
while (true) {
if ($lastType !== Lexer::TOKEN_IDENTIFIER && $tokens->currentTokenType() === Lexer::TOKEN_IDENTIFIER) {
$classConstantName .= $tokens->currentTokenValue();
$tokens->consumeTokenType(Lexer::TOKEN_IDENTIFIER);
$lastType = Lexer::TOKEN_IDENTIFIER;
continue;
}
if ($lastType !== Lexer::TOKEN_WILDCARD && $tokens->tryConsumeTokenType(Lexer::TOKEN_WILDCARD)) {
$classConstantName .= '*';
$lastType = Lexer::TOKEN_WILDCARD;
if ($tokens->getSkippedHorizontalWhiteSpaceIfAny() !== '') {
break;
}
continue;
}
if ($lastType === null) {
// trigger parse error if nothing valid was consumed
$tokens->consumeTokenType(Lexer::TOKEN_WILDCARD);
}
break;
}
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstFetchNode($identifier, $classConstantName),
$startLine,
$startIndex,
);
}
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstFetchNode('', $identifier),
$startLine,
$startIndex,
);
} elseif ($tokens->tryConsumeTokenType(Lexer::TOKEN_OPEN_SQUARE_BRACKET)) {
return $this->parseArray($tokens, Lexer::TOKEN_CLOSE_SQUARE_BRACKET, $startIndex);
}
throw new ParserException(
$tokens->currentTokenValue(),
$tokens->currentTokenType(),
$tokens->currentTokenOffset(),
Lexer::TOKEN_IDENTIFIER,
null,
$tokens->currentTokenLine(),
);
}
private function parseArray(TokenIterator $tokens, int $endToken, int $startIndex): Ast\ConstExpr\ConstExprArrayNode
{
$items = [];
$startLine = $tokens->currentTokenLine();
if (!$tokens->tryConsumeTokenType($endToken)) {
do {
$items[] = $this->parseArrayItem($tokens);
} while ($tokens->tryConsumeTokenType(Lexer::TOKEN_COMMA) && !$tokens->isCurrentTokenType($endToken));
$tokens->consumeTokenType($endToken);
}
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprArrayNode($items),
$startLine,
$startIndex,
);
}
/**
* This method is supposed to be called with TokenIterator after reading TOKEN_DOUBLE_QUOTED_STRING and shifting
* to the next token.
*/
public function parseDoctrineString(string $text, TokenIterator $tokens): Ast\ConstExpr\DoctrineConstExprStringNode
{
// Because of how Lexer works, a valid Doctrine string
// can consist of a sequence of TOKEN_DOUBLE_QUOTED_STRING and TOKEN_DOCTRINE_ANNOTATION_STRING
while ($tokens->isCurrentTokenType(Lexer::TOKEN_DOUBLE_QUOTED_STRING, Lexer::TOKEN_DOCTRINE_ANNOTATION_STRING)) {
$text .= $tokens->currentTokenValue();
$tokens->next();
}
return new Ast\ConstExpr\DoctrineConstExprStringNode(Ast\ConstExpr\DoctrineConstExprStringNode::unescape($text));
}
private function parseArrayItem(TokenIterator $tokens): Ast\ConstExpr\ConstExprArrayItemNode
{
$startLine = $tokens->currentTokenLine();
$startIndex = $tokens->currentTokenIndex();
$expr = $this->parse($tokens);
if ($tokens->tryConsumeTokenType(Lexer::TOKEN_DOUBLE_ARROW)) {
$key = $expr;
$value = $this->parse($tokens);
} else {
$key = null;
$value = $expr;
}
return $this->enrichWithAttributes(
$tokens,
new Ast\ConstExpr\ConstExprArrayItemNode($key, $value),
$startLine,
$startIndex,
);
}
/**
* @template T of Ast\ConstExpr\ConstExprNode
* @param T $node
* @return T
*/
private function enrichWithAttributes(TokenIterator $tokens, Ast\ConstExpr\ConstExprNode $node, int $startLine, int $startIndex): Ast\ConstExpr\ConstExprNode
{
if ($this->config->useLinesAttributes) {
$node->setAttribute(Ast\Attribute::START_LINE, $startLine);
$node->setAttribute(Ast\Attribute::END_LINE, $tokens->currentTokenLine());
}
if ($this->config->useIndexAttributes) {
$node->setAttribute(Ast\Attribute::START_INDEX, $startIndex);
$node->setAttribute(Ast\Attribute::END_INDEX, $tokens->endIndexOfLastRelevantToken());
}
return $node;
}
}