Version 1

[yaffs-website] / vendor / nikic / php-parser / lib / PhpParser / Lexer / Emulative.php

diff --git a/vendor/nikic/php-parser/lib/PhpParser/Lexer/Emulative.php b/vendor/nikic/php-parser/lib/PhpParser/Lexer/Emulative.php
new file mode 100644 (file)
index 0000000..739a328
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/Lexer/Emulative.php
@@ -0,0 +1,174 @@
+<?php
+
+namespace PhpParser\Lexer;
+
+use PhpParser\ErrorHandler;
+use PhpParser\Parser\Tokens;
+
+class Emulative extends \PhpParser\Lexer
+{
+    protected $newKeywords;
+    protected $inObjectAccess;
+
+    const T_ELLIPSIS   = 1001;
+    const T_POW        = 1002;
+    const T_POW_EQUAL  = 1003;
+    const T_COALESCE   = 1004;
+    const T_SPACESHIP  = 1005;
+    const T_YIELD_FROM = 1006;
+
+    const PHP_7_0 = '7.0.0dev';
+    const PHP_5_6 = '5.6.0rc1';
+
+    public function __construct(array $options = array()) {
+        parent::__construct($options);
+
+        $newKeywordsPerVersion = array(
+            // No new keywords since PHP 5.5
+        );
+
+        $this->newKeywords = array();
+        foreach ($newKeywordsPerVersion as $version => $newKeywords) {
+            if (version_compare(PHP_VERSION, $version, '>=')) {
+                break;
+            }
+
+            $this->newKeywords += $newKeywords;
+        }
+
+        if (version_compare(PHP_VERSION, self::PHP_7_0, '>=')) {
+            return;
+        }
+        $this->tokenMap[self::T_COALESCE]   = Tokens::T_COALESCE;
+        $this->tokenMap[self::T_SPACESHIP]  = Tokens::T_SPACESHIP;
+        $this->tokenMap[self::T_YIELD_FROM] = Tokens::T_YIELD_FROM;
+
+        if (version_compare(PHP_VERSION, self::PHP_5_6, '>=')) {
+            return;
+        }
+        $this->tokenMap[self::T_ELLIPSIS]  = Tokens::T_ELLIPSIS;
+        $this->tokenMap[self::T_POW]       = Tokens::T_POW;
+        $this->tokenMap[self::T_POW_EQUAL] = Tokens::T_POW_EQUAL;
+    }
+
+    public function startLexing($code, ErrorHandler $errorHandler = null) {
+        $this->inObjectAccess = false;
+
+        parent::startLexing($code, $errorHandler);
+        if ($this->requiresEmulation($code)) {
+            $this->emulateTokens();
+        }
+    }
+
+    /*
+     * Checks if the code is potentially using features that require emulation.
+     */
+    protected function requiresEmulation($code) {
+        if (version_compare(PHP_VERSION, self::PHP_7_0, '>=')) {
+            return false;
+        }
+
+        if (preg_match('(\?\?|<=>|yield[ \n\r\t]+from)', $code)) {
+            return true;
+        }
+
+        if (version_compare(PHP_VERSION, self::PHP_5_6, '>=')) {
+            return false;
+        }
+
+        return preg_match('(\.\.\.|(?<!/)\*\*(?!/))', $code);
+    }
+
+    /*
+     * Emulates tokens for newer PHP versions.
+     */
+    protected function emulateTokens() {
+        // We need to manually iterate and manage a count because we'll change
+        // the tokens array on the way
+        $line = 1;
+        for ($i = 0, $c = count($this->tokens); $i < $c; ++$i) {
+            $replace = null;
+            if (isset($this->tokens[$i + 1])) {
+                if ($this->tokens[$i] === '?' && $this->tokens[$i + 1] === '?') {
+                    array_splice($this->tokens, $i, 2, array(
+                        array(self::T_COALESCE, '??', $line)
+                    ));
+                    $c--;
+                    continue;
+                }
+                if ($this->tokens[$i][0] === T_IS_SMALLER_OR_EQUAL
+                    && $this->tokens[$i + 1] === '>'
+                ) {
+                    array_splice($this->tokens, $i, 2, array(
+                        array(self::T_SPACESHIP, '<=>', $line)
+                    ));
+                    $c--;
+                    continue;
+                }
+                if ($this->tokens[$i] === '*' && $this->tokens[$i + 1] === '*') {
+                    array_splice($this->tokens, $i, 2, array(
+                        array(self::T_POW, '**', $line)
+                    ));
+                    $c--;
+                    continue;
+                }
+                if ($this->tokens[$i] === '*' && $this->tokens[$i + 1][0] === T_MUL_EQUAL) {
+                    array_splice($this->tokens, $i, 2, array(
+                        array(self::T_POW_EQUAL, '**=', $line)
+                    ));
+                    $c--;
+                    continue;
+                }
+            }
+
+            if (isset($this->tokens[$i + 2])) {
+                if ($this->tokens[$i][0] === T_YIELD && $this->tokens[$i + 1][0] === T_WHITESPACE
+                    && $this->tokens[$i + 2][0] === T_STRING
+                    && !strcasecmp($this->tokens[$i + 2][1], 'from')
+                ) {
+                    array_splice($this->tokens, $i, 3, array(
+                        array(
+                            self::T_YIELD_FROM,
+                            $this->tokens[$i][1] . $this->tokens[$i + 1][1] . $this->tokens[$i + 2][1],
+                            $line
+                        )
+                    ));
+                    $c -= 2;
+                    $line += substr_count($this->tokens[$i][1], "\n");
+                    continue;
+                }
+                if ($this->tokens[$i] === '.' && $this->tokens[$i + 1] === '.'
+                    && $this->tokens[$i + 2] === '.'
+                ) {
+                    array_splice($this->tokens, $i, 3, array(
+                        array(self::T_ELLIPSIS, '...', $line)
+                    ));
+                    $c -= 2;
+                    continue;
+                }
+            }
+
+            if (\is_array($this->tokens[$i])) {
+                $line += substr_count($this->tokens[$i][1], "\n");
+            }
+        }
+    }
+
+    public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) {
+        $token = parent::getNextToken($value, $startAttributes, $endAttributes);
+
+        // replace new keywords by their respective tokens. This is not done
+        // if we currently are in an object access (e.g. in $obj->namespace
+        // "namespace" stays a T_STRING tokens and isn't converted to T_NAMESPACE)
+        if (Tokens::T_STRING === $token && !$this->inObjectAccess) {
+            if (isset($this->newKeywords[strtolower($value)])) {
+                return $this->newKeywords[strtolower($value)];
+            }
+        } else {
+            // keep track of whether we currently are in an object access (after ->)
+            $this->inObjectAccess = Tokens::T_OBJECT_OPERATOR === $token;
+        }
+
+        return $token;
+    }
+}