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<?php declare(strict_types = 1);
namespace PHPStan\PhpDocParser\Parser;
use LogicException;
use PHPStan\PhpDocParser\Lexer\Lexer;
use function array_pop;
use function assert;
use function count;
use function in_array;
use function strlen;
class TokenIterator
{
/** @var list<array{string, int, int}> */
private $tokens;
/** @var int */
private $index;
/** @var int[] */
private $savePoints = [];
/** @var list<int> */
private $skippedTokenTypes = [Lexer::TOKEN_HORIZONTAL_WS];
/**
* @param list<array{string, int, int}> $tokens
*/
public function __construct(array $tokens, int $index = 0)
{
$this->tokens = $tokens;
$this->index = $index;
$this->skipIrrelevantTokens();
}
/**
* @return list<array{string, int, int}>
*/
public function getTokens(): array
{
return $this->tokens;
}
public function getContentBetween(int $startPos, int $endPos): string
{
if ($startPos < 0 || $endPos > count($this->tokens)) {
throw new LogicException();
}
$content = '';
for ($i = $startPos; $i < $endPos; $i++) {
$content .= $this->tokens[$i][Lexer::VALUE_OFFSET];
}
return $content;
}
public function getTokenCount(): int
{
return count($this->tokens);
}
public function currentTokenValue(): string
{
return $this->tokens[$this->index][Lexer::VALUE_OFFSET];
}
public function currentTokenType(): int
{
return $this->tokens[$this->index][Lexer::TYPE_OFFSET];
}
public function currentTokenOffset(): int
{
$offset = 0;
for ($i = 0; $i < $this->index; $i++) {
$offset += strlen($this->tokens[$i][Lexer::VALUE_OFFSET]);
}
return $offset;
}
public function currentTokenLine(): int
{
return $this->tokens[$this->index][Lexer::LINE_OFFSET];
}
public function currentTokenIndex(): int
{
return $this->index;
}
public function endIndexOfLastRelevantToken(): int
{
$endIndex = $this->currentTokenIndex();
$endIndex--;
while (in_array($this->tokens[$endIndex][Lexer::TYPE_OFFSET], $this->skippedTokenTypes, true)) {
if (!isset($this->tokens[$endIndex - 1])) {
break;
}
$endIndex--;
}
return $endIndex;
}
public function isCurrentTokenValue(string $tokenValue): bool
{
return $this->tokens[$this->index][Lexer::VALUE_OFFSET] === $tokenValue;
}
public function isCurrentTokenType(int ...$tokenType): bool
{
return in_array($this->tokens[$this->index][Lexer::TYPE_OFFSET], $tokenType, true);
}
public function isPrecededByHorizontalWhitespace(): bool
{
return ($this->tokens[$this->index - 1][Lexer::TYPE_OFFSET] ?? -1) === Lexer::TOKEN_HORIZONTAL_WS;
}
/**
* @throws ParserException
*/
public function consumeTokenType(int $tokenType): void
{
if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType) {
$this->throwError($tokenType);
}
$this->index++;
$this->skipIrrelevantTokens();
}
/**
* @throws ParserException
*/
public function consumeTokenValue(int $tokenType, string $tokenValue): void
{
if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType || $this->tokens[$this->index][Lexer::VALUE_OFFSET] !== $tokenValue) {
$this->throwError($tokenType, $tokenValue);
}
$this->index++;
$this->skipIrrelevantTokens();
}
/** @phpstan-impure */
public function tryConsumeTokenValue(string $tokenValue): bool
{
if ($this->tokens[$this->index][Lexer::VALUE_OFFSET] !== $tokenValue) {
return false;
}
$this->index++;
$this->skipIrrelevantTokens();
return true;
}
/** @phpstan-impure */
public function tryConsumeTokenType(int $tokenType): bool
{
if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType) {
return false;
}
$this->index++;
$this->skipIrrelevantTokens();
return true;
}
public function getSkippedHorizontalWhiteSpaceIfAny(): string
{
if ($this->index > 0 && $this->tokens[$this->index - 1][Lexer::TYPE_OFFSET] === Lexer::TOKEN_HORIZONTAL_WS) {
return $this->tokens[$this->index - 1][Lexer::VALUE_OFFSET];
}
return '';
}
/** @phpstan-impure */
public function joinUntil(int ...$tokenType): string
{
$s = '';
while (!in_array($this->tokens[$this->index][Lexer::TYPE_OFFSET], $tokenType, true)) {
$s .= $this->tokens[$this->index++][Lexer::VALUE_OFFSET];
}
return $s;
}
public function next(): void
{
$this->index++;
$this->skipIrrelevantTokens();
}
private function skipIrrelevantTokens(): void
{
if (!isset($this->tokens[$this->index])) {
return;
}
while (in_array($this->tokens[$this->index][Lexer::TYPE_OFFSET], $this->skippedTokenTypes, true)) {
if (!isset($this->tokens[$this->index + 1])) {
break;
}
$this->index++;
}
}
public function addEndOfLineToSkippedTokens(): void
{
$this->skippedTokenTypes = [Lexer::TOKEN_HORIZONTAL_WS, Lexer::TOKEN_PHPDOC_EOL];
}
public function removeEndOfLineFromSkippedTokens(): void
{
$this->skippedTokenTypes = [Lexer::TOKEN_HORIZONTAL_WS];
}
/** @phpstan-impure */
public function forwardToTheEnd(): void
{
$lastToken = count($this->tokens) - 1;
$this->index = $lastToken;
}
public function pushSavePoint(): void
{
$this->savePoints[] = $this->index;
}
public function dropSavePoint(): void
{
array_pop($this->savePoints);
}
public function rollback(): void
{
$index = array_pop($this->savePoints);
assert($index !== null);
$this->index = $index;
}
/**
* @throws ParserException
*/
private function throwError(int $expectedTokenType, ?string $expectedTokenValue = null): void
{
throw new ParserException(
$this->currentTokenValue(),
$this->currentTokenType(),
$this->currentTokenOffset(),
$expectedTokenType,
$expectedTokenValue,
$this->currentTokenLine()
);
}
/**
* Check whether the position is directly preceded by a certain token type.
*
* During this check TOKEN_HORIZONTAL_WS and TOKEN_PHPDOC_EOL are skipped
*/
public function hasTokenImmediatelyBefore(int $pos, int $expectedTokenType): bool
{
$tokens = $this->tokens;
$pos--;
for (; $pos >= 0; $pos--) {
$token = $tokens[$pos];
$type = $token[Lexer::TYPE_OFFSET];
if ($type === $expectedTokenType) {
return true;
}
if (!in_array($type, [
Lexer::TOKEN_HORIZONTAL_WS,
Lexer::TOKEN_PHPDOC_EOL,
], true)) {
break;
}
}
return false;
}
/**
* Check whether the position is directly followed by a certain token type.
*
* During this check TOKEN_HORIZONTAL_WS and TOKEN_PHPDOC_EOL are skipped
*/
public function hasTokenImmediatelyAfter(int $pos, int $expectedTokenType): bool
{
$tokens = $this->tokens;
$pos++;
for ($c = count($tokens); $pos < $c; $pos++) {
$token = $tokens[$pos];
$type = $token[Lexer::TYPE_OFFSET];
if ($type === $expectedTokenType) {
return true;
}
if (!in_array($type, [
Lexer::TOKEN_HORIZONTAL_WS,
Lexer::TOKEN_PHPDOC_EOL,
], true)) {
break;
}
}
return false;
}
/**
* Whether the given position is immediately surrounded by parenthesis.
*/
public function hasParentheses(int $startPos, int $endPos): bool
{
return $this->hasTokenImmediatelyBefore($startPos, Lexer::TOKEN_OPEN_PARENTHESES)
&& $this->hasTokenImmediatelyAfter($endPos, Lexer::TOKEN_CLOSE_PARENTHESES);
}
}
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