175 lines
6 KiB
PHP
175 lines
6 KiB
PHP
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<?php
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namespace PhpParser\Lexer;
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use PhpParser\ErrorHandler;
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use PhpParser\Parser\Tokens;
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class Emulative extends \PhpParser\Lexer
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{
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protected $newKeywords;
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protected $inObjectAccess;
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const T_ELLIPSIS = 1001;
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const T_POW = 1002;
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const T_POW_EQUAL = 1003;
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const T_COALESCE = 1004;
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const T_SPACESHIP = 1005;
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const T_YIELD_FROM = 1006;
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const PHP_7_0 = '7.0.0dev';
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const PHP_5_6 = '5.6.0rc1';
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public function __construct(array $options = array()) {
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parent::__construct($options);
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$newKeywordsPerVersion = array(
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// No new keywords since PHP 5.5
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);
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$this->newKeywords = array();
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foreach ($newKeywordsPerVersion as $version => $newKeywords) {
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if (version_compare(PHP_VERSION, $version, '>=')) {
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break;
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}
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$this->newKeywords += $newKeywords;
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}
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if (version_compare(PHP_VERSION, self::PHP_7_0, '>=')) {
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return;
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}
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$this->tokenMap[self::T_COALESCE] = Tokens::T_COALESCE;
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$this->tokenMap[self::T_SPACESHIP] = Tokens::T_SPACESHIP;
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$this->tokenMap[self::T_YIELD_FROM] = Tokens::T_YIELD_FROM;
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if (version_compare(PHP_VERSION, self::PHP_5_6, '>=')) {
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return;
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}
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$this->tokenMap[self::T_ELLIPSIS] = Tokens::T_ELLIPSIS;
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$this->tokenMap[self::T_POW] = Tokens::T_POW;
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$this->tokenMap[self::T_POW_EQUAL] = Tokens::T_POW_EQUAL;
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}
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public function startLexing($code, ErrorHandler $errorHandler = null) {
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$this->inObjectAccess = false;
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parent::startLexing($code, $errorHandler);
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if ($this->requiresEmulation($code)) {
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$this->emulateTokens();
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}
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}
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/*
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* Checks if the code is potentially using features that require emulation.
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*/
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protected function requiresEmulation($code) {
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if (version_compare(PHP_VERSION, self::PHP_7_0, '>=')) {
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return false;
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}
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if (preg_match('(\?\?|<=>|yield[ \n\r\t]+from)', $code)) {
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return true;
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}
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if (version_compare(PHP_VERSION, self::PHP_5_6, '>=')) {
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return false;
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}
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return preg_match('(\.\.\.|(?<!/)\*\*(?!/))', $code);
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}
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/*
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* Emulates tokens for newer PHP versions.
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*/
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protected function emulateTokens() {
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// We need to manually iterate and manage a count because we'll change
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// the tokens array on the way
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$line = 1;
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for ($i = 0, $c = count($this->tokens); $i < $c; ++$i) {
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$replace = null;
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if (isset($this->tokens[$i + 1])) {
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if ($this->tokens[$i] === '?' && $this->tokens[$i + 1] === '?') {
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array_splice($this->tokens, $i, 2, array(
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array(self::T_COALESCE, '??', $line)
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));
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$c--;
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continue;
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}
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if ($this->tokens[$i][0] === T_IS_SMALLER_OR_EQUAL
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&& $this->tokens[$i + 1] === '>'
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) {
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array_splice($this->tokens, $i, 2, array(
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array(self::T_SPACESHIP, '<=>', $line)
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));
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$c--;
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continue;
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}
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if ($this->tokens[$i] === '*' && $this->tokens[$i + 1] === '*') {
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array_splice($this->tokens, $i, 2, array(
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array(self::T_POW, '**', $line)
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));
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$c--;
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continue;
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}
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if ($this->tokens[$i] === '*' && $this->tokens[$i + 1][0] === T_MUL_EQUAL) {
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array_splice($this->tokens, $i, 2, array(
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array(self::T_POW_EQUAL, '**=', $line)
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));
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$c--;
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continue;
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}
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}
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if (isset($this->tokens[$i + 2])) {
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if ($this->tokens[$i][0] === T_YIELD && $this->tokens[$i + 1][0] === T_WHITESPACE
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&& $this->tokens[$i + 2][0] === T_STRING
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&& !strcasecmp($this->tokens[$i + 2][1], 'from')
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) {
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array_splice($this->tokens, $i, 3, array(
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array(
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self::T_YIELD_FROM,
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$this->tokens[$i][1] . $this->tokens[$i + 1][1] . $this->tokens[$i + 2][1],
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$line
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)
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));
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$c -= 2;
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$line += substr_count($this->tokens[$i][1], "\n");
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continue;
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}
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if ($this->tokens[$i] === '.' && $this->tokens[$i + 1] === '.'
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&& $this->tokens[$i + 2] === '.'
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) {
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array_splice($this->tokens, $i, 3, array(
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array(self::T_ELLIPSIS, '...', $line)
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));
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$c -= 2;
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continue;
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}
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}
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if (\is_array($this->tokens[$i])) {
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$line += substr_count($this->tokens[$i][1], "\n");
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}
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}
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}
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public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) {
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$token = parent::getNextToken($value, $startAttributes, $endAttributes);
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// replace new keywords by their respective tokens. This is not done
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// if we currently are in an object access (e.g. in $obj->namespace
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// "namespace" stays a T_STRING tokens and isn't converted to T_NAMESPACE)
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if (Tokens::T_STRING === $token && !$this->inObjectAccess) {
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if (isset($this->newKeywords[strtolower($value)])) {
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return $this->newKeywords[strtolower($value)];
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}
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} else {
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// keep track of whether we currently are in an object access (after ->)
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$this->inObjectAccess = Tokens::T_OBJECT_OPERATOR === $token;
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}
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return $token;
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}
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}
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