<?php declare(strict_types=1);
namespace PhpParser\Internal;
use PhpParser\Token;
/**
* Provides operations on token streams, for use by pretty printer.
*
* @internal
*/
class TokenStream {
/** @var Token[] Tokens (in PhpToken::tokenize() format) */
private array $tokens;
/** @var int[] Map from position to indentation */
private array $indentMap;
/**
* Create token stream instance.
*
* @param Token[] $tokens Tokens in PhpToken::tokenize() format
*/
public function __construct(array $tokens) {
$this->tokens = $tokens;
$this->indentMap = $this->calcIndentMap();
}
/**
* Whether the given position is immediately surrounded by parenthesis.
*
* @param int $startPos Start position
* @param int $endPos End position
*/
public function haveParens(int $startPos, int $endPos): bool {
return $this->haveTokenImmediatelyBefore($startPos, '(')
&& $this->haveTokenImmediatelyAfter($endPos, ')');
}
/**
* Whether the given position is immediately surrounded by braces.
*
* @param int $startPos Start position
* @param int $endPos End position
*/
public function haveBraces(int $startPos, int $endPos): bool {
return ($this->haveTokenImmediatelyBefore($startPos, '{')
|| $this->haveTokenImmediatelyBefore($startPos, T_CURLY_OPEN))
&& $this->haveTokenImmediatelyAfter($endPos, '}');
}
/**
* Check whether the position is directly preceded by a certain token type.
*
* During this check whitespace and comments are skipped.
*
* @param int $pos Position before which the token should occur
* @param int|string $expectedTokenType Token to check for
*
* @return bool Whether the expected token was found
*/
public function haveTokenImmediatelyBefore(int $pos, $expectedTokenType): bool {
$tokens = $this->tokens;
$pos--;
for (; $pos >= 0; $pos--) {
$token = $tokens[$pos];
if ($token->is($expectedTokenType)) {
return true;
}
if (!$token->isIgnorable()) {
break;
}
}
return false;
}
/**
* Check whether the position is directly followed by a certain token type.
*
* During this check whitespace and comments are skipped.
*
* @param int $pos Position after which the token should occur
* @param int|string $expectedTokenType Token to check for
*
* @return bool Whether the expected token was found
*/
public function haveTokenImmediatelyAfter(int $pos, $expectedTokenType): bool {
$tokens = $this->tokens;
$pos++;
for ($c = \count($tokens); $pos < $c; $pos++) {
$token = $tokens[$pos];
if ($token->is($expectedTokenType)) {
return true;
}
if (!$token->isIgnorable()) {
break;
}
}
return false;
}
/** @param int|string|(int|string)[] $skipTokenType */
public function skipLeft(int $pos, $skipTokenType): int {
$tokens = $this->tokens;
$pos = $this->skipLeftWhitespace($pos);
if ($skipTokenType === \T_WHITESPACE) {
return $pos;
}
if (!$tokens[$pos]->is($skipTokenType)) {
// Shouldn't happen. The skip token MUST be there
throw new \Exception('Encountered unexpected token');
}
$pos--;
return $this->skipLeftWhitespace($pos);
}
/** @param int|string|(int|string)[] $skipTokenType */
public function skipRight(int $pos, $skipTokenType): int {
$tokens = $this->tokens;
$pos = $this->skipRightWhitespace($pos);
if ($skipTokenType === \T_WHITESPACE) {
return $pos;
}
if (!$tokens[$pos]->is($skipTokenType)) {
// Shouldn't happen. The skip token MUST be there
throw new \Exception('Encountered unexpected token');
}
$pos++;
return $this->skipRightWhitespace($pos);
}
/**
* Return first non-whitespace token position smaller or equal to passed position.
*
* @param int $pos Token position
* @return int Non-whitespace token position
*/
public function skipLeftWhitespace(int $pos): int {
$tokens = $this->tokens;
for (; $pos >= 0; $pos--) {
if (!$tokens[$pos]->isIgnorable()) {
break;
}
}
return $pos;
}
/**
* Return first non-whitespace position greater or equal to passed position.
*
* @param int $pos Token position
* @return int Non-whitespace token position
*/
public function skipRightWhitespace(int $pos): int {
$tokens = $this->tokens;
for ($count = \count($tokens); $pos < $count; $pos++) {
if (!$tokens[$pos]->isIgnorable()) {
break;
}
}
return $pos;
}
/** @param int|string|(int|string)[] $findTokenType */
public function findRight(int $pos, $findTokenType): int {
$tokens = $this->tokens;
for ($count = \count($tokens); $pos < $count; $pos++) {
if ($tokens[$pos]->is($findTokenType)) {
return $pos;
}
}
return -1;
}
/**
* Whether the given position range contains a certain token type.
*
* @param int $startPos Starting position (inclusive)
* @param int $endPos Ending position (exclusive)
* @param int|string $tokenType Token type to look for
* @return bool Whether the token occurs in the given range
*/
public function haveTokenInRange(int $startPos, int $endPos, $tokenType): bool {
$tokens = $this->tokens;
for ($pos = $startPos; $pos < $endPos; $pos++) {
if ($tokens[$pos]->is($tokenType)) {
return true;
}
}
return false;
}
public function haveTagInRange(int $startPos, int $endPos): bool {
return $this->haveTokenInRange($startPos, $endPos, \T_OPEN_TAG)
|| $this->haveTokenInRange($startPos, $endPos, \T_CLOSE_TAG);
}
/**
* Get indentation before token position.
*
* @param int $pos Token position
*
* @return int Indentation depth (in spaces)
*/
public function getIndentationBefore(int $pos): int {
return $this->indentMap[$pos];
}
/**
* Get the code corresponding to a token offset range, optionally adjusted for indentation.
*
* @param int $from Token start position (inclusive)
* @param int $to Token end position (exclusive)
* @param int $indent By how much the code should be indented (can be negative as well)
*
* @return string Code corresponding to token range, adjusted for indentation
*/
public function getTokenCode(int $from, int $to, int $indent): string {
$tokens = $this->tokens;
$result = '';
for ($pos = $from; $pos < $to; $pos++) {
$token = $tokens[$pos];
$id = $token->id;
$text = $token->text;
if ($id === \T_CONSTANT_ENCAPSED_STRING || $id === \T_ENCAPSED_AND_WHITESPACE) {
$result .= $text;
} else {
// TODO Handle non-space indentation
if ($indent < 0) {
$result .= str_replace("\n" . str_repeat(" ", -$indent), "\n", $text);
} elseif ($indent > 0) {
$result .= str_replace("\n", "\n" . str_repeat(" ", $indent), $text);
} else {
$result .= $text;
}
}
}
return $result;
}
/**
* Precalculate the indentation at every token position.
*
* @return int[] Token position to indentation map
*/
private function calcIndentMap(): array {
$indentMap = [];
$indent = 0;
foreach ($this->tokens as $i => $token) {
$indentMap[] = $indent;
if ($token->id === \T_WHITESPACE) {
$content = $token->text;
$newlinePos = \strrpos($content, "\n");
if (false !== $newlinePos) {
$indent = \strlen($content) - $newlinePos - 1;
} elseif ($i === 1 && $this->tokens[0]->id === \T_OPEN_TAG &&
$this->tokens[0]->text[\strlen($this->tokens[0]->text) - 1] === "\n") {
// Special case: Newline at the end of opening tag followed by whitespace.
$indent = \strlen($content);
}
}
}
// Add a sentinel for one past end of the file
$indentMap[] = $indent;
return $indentMap;
}
}
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