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