<?php declare(strict_types=1);
namespace PhpParser\Internal;
/**
* Provides operations on token streams, for use by pretty printer.
*
* @internal
*/
class TokenStream
{
/** @var array Tokens (in token_get_all format) */
private $tokens;
/** @var int[] Map from position to indentation */
private $indentMap;
/**
* Create token stream instance.
*
* @param array $tokens Tokens in token_get_all() 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
*
* @return bool
*/
public function haveParens(int $startPos, int $endPos) : bool {
return $this->haveTokenImmediativelyBefore($startPos, '(')
&& $this->haveTokenImmediatelyAfter($endPos, ')');
}
/**
* Whether the given position is immediately surrounded by braces.
*
* @param int $startPos Start position
* @param int $endPos End position
*
* @return bool
*/
public function haveBraces(int $startPos, int $endPos) : bool {
return $this->haveTokenImmediativelyBefore($startPos, '{')
&& $this->haveTokenImmediatelyAfter($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 haveTokenImmediativelyBefore(int $pos, $expectedTokenType) : bool {
$tokens = $this->tokens;
$pos--;
for (; $pos >= 0; $pos--) {
$tokenType = $tokens[$pos][0];
if ($tokenType === $expectedTokenType) {
return true;
}
if ($tokenType !== \T_WHITESPACE
&& $tokenType !== \T_COMMENT && $tokenType !== \T_DOC_COMMENT) {
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 (; $pos < \count($tokens); $pos++) {
$tokenType = $tokens[$pos][0];
if ($tokenType === $expectedTokenType) {
return true;
}
if ($tokenType !== \T_WHITESPACE
&& $tokenType !== \T_COMMENT && $tokenType !== \T_DOC_COMMENT) {
break;
}
}
return false;
}
public function skipLeft(int $pos, $skipTokenType) {
$tokens = $this->tokens;
$pos = $this->skipLeftWhitespace($pos);
if ($skipTokenType === \T_WHITESPACE) {
return $pos;
}
if ($tokens[$pos][0] !== $skipTokenType) {
// Shouldn't happen. The skip token MUST be there
throw new \Exception('Encountered unexpected token');
}
$pos--;
return $this->skipLeftWhitespace($pos);
}
public function skipRight(int $pos, $skipTokenType) {
$tokens = $this->tokens;
$pos = $this->skipRightWhitespace($pos);
if ($skipTokenType === \T_WHITESPACE) {
return $pos;
}
if ($tokens[$pos][0] !== $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) {
$tokens = $this->tokens;
for (; $pos >= 0; $pos--) {
$type = $tokens[$pos][0];
if ($type !== \T_WHITESPACE && $type !== \T_COMMENT && $type !== \T_DOC_COMMENT) {
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) {
$tokens = $this->tokens;
for ($count = \count($tokens); $pos < $count; $pos++) {
$type = $tokens[$pos][0];
if ($type !== \T_WHITESPACE && $type !== \T_COMMENT && $type !== \T_DOC_COMMENT) {
break;
}
}
return $pos;
}
public function findRight($pos, $findTokenType) {
$tokens = $this->tokens;
for ($count = \count($tokens); $pos < $count; $pos++) {
$type = $tokens[$pos][0];
if ($type === $findTokenType) {
return $pos;
}
}
return -1;
}
/**
* 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];
if (\is_array($token)) {
$type = $token[0];
$content = $token[1];
if ($type === \T_CONSTANT_ENCAPSED_STRING || $type === \T_ENCAPSED_AND_WHITESPACE) {
$result .= $content;
} else {
// TODO Handle non-space indentation
if ($indent < 0) {
$result .= str_replace("\n" . str_repeat(" ", -$indent), "\n", $content);
} elseif ($indent > 0) {
$result .= str_replace("\n", "\n" . str_repeat(" ", $indent), $content);
} else {
$result .= $content;
}
}
} else {
$result .= $token;
}
}
return $result;
}
/**
* Precalculate the indentation at every token position.
*
* @return int[] Token position to indentation map
*/
private function calcIndentMap() {
$indentMap = [];
$indent = 0;
foreach ($this->tokens as $token) {
$indentMap[] = $indent;
if ($token[0] === \T_WHITESPACE) {
$content = $token[1];
$newlinePos = \strrpos($content, "\n");
if (false !== $newlinePos) {
$indent = \strlen($content) - $newlinePos - 1;
}
}
}
// Add a sentinel for one past end of the file
$indentMap[] = $indent;
return $indentMap;
}
}