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phpMyAdmin/vendor/phpmyadmin/sql-parser/src/TokensList.php

@@ -0,0 +1,203 @@
+<?php
+
+/**
+ * Defines an array of tokens and utility functions to iterate through it.
+ */
+
+namespace PhpMyAdmin\SqlParser;
+
+/**
+ * A structure representing a list of tokens.
+ *
+ * @category Tokens
+ *
+ * @license  https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
+ */
+class TokensList implements \ArrayAccess
+{
+    /**
+     * The array of tokens.
+     *
+     * @var array
+     */
+    public $tokens = array();
+
+    /**
+     * The count of tokens.
+     *
+     * @var int
+     */
+    public $count = 0;
+
+    /**
+     * The index of the next token to be returned.
+     *
+     * @var int
+     */
+    public $idx = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $tokens the initial array of tokens
+     * @param int   $count  the count of tokens in the initial array
+     */
+    public function __construct(array $tokens = array(), $count = -1)
+    {
+        if (! empty($tokens)) {
+            $this->tokens = $tokens;
+            if ($count === -1) {
+                $this->count = count($tokens);
+            }
+        }
+    }
+
+    /**
+     * Builds an array of tokens by merging their raw value.
+     *
+     * @param string|Token[]|TokensList $list the tokens to be built
+     *
+     * @return string
+     */
+    public static function build($list)
+    {
+        if (is_string($list)) {
+            return $list;
+        }
+
+        if ($list instanceof self) {
+            $list = $list->tokens;
+        }
+
+        $ret = '';
+        if (is_array($list)) {
+            foreach ($list as $tok) {
+                $ret .= $tok->token;
+            }
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Adds a new token.
+     *
+     * @param Token $token token to be added in list
+     */
+    public function add(Token $token)
+    {
+        $this->tokens[$this->count++] = $token;
+    }
+
+    /**
+     * Gets the next token. Skips any irrelevant token (whitespaces and
+     * comments).
+     *
+     * @return Token|null
+     */
+    public function getNext()
+    {
+        for (; $this->idx < $this->count; ++$this->idx) {
+            if (($this->tokens[$this->idx]->type !== Token::TYPE_WHITESPACE)
+                && ($this->tokens[$this->idx]->type !== Token::TYPE_COMMENT)
+            ) {
+                return $this->tokens[$this->idx++];
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Gets the next token.
+     *
+     * @param int $type the type
+     *
+     * @return Token|null
+     */
+    public function getNextOfType($type)
+    {
+        for (; $this->idx < $this->count; ++$this->idx) {
+            if ($this->tokens[$this->idx]->type === $type) {
+                return $this->tokens[$this->idx++];
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Gets the next token.
+     *
+     * @param int    $type  the type of the token
+     * @param string $value the value of the token
+     *
+     * @return Token|null
+     */
+    public function getNextOfTypeAndValue($type, $value)
+    {
+        for (; $this->idx < $this->count; ++$this->idx) {
+            if (($this->tokens[$this->idx]->type === $type)
+                && ($this->tokens[$this->idx]->value === $value)
+            ) {
+                return $this->tokens[$this->idx++];
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Sets an value inside the container.
+     *
+     * @param int   $offset the offset to be set
+     * @param Token $value  the token to be saved
+     */
+    public function offsetSet($offset, $value)
+    {
+        if ($offset === null) {
+            $this->tokens[$this->count++] = $value;
+        } else {
+            $this->tokens[$offset] = $value;
+        }
+    }
+
+    /**
+     * Gets a value from the container.
+     *
+     * @param int $offset the offset to be returned
+     *
+     * @return Token
+     */
+    public function offsetGet($offset)
+    {
+        return $offset < $this->count ? $this->tokens[$offset] : null;
+    }
+
+    /**
+     * Checks if an offset was previously set.
+     *
+     * @param int $offset the offset to be checked
+     *
+     * @return bool
+     */
+    public function offsetExists($offset)
+    {
+        return $offset < $this->count;
+    }
+
+    /**
+     * Unsets the value of an offset.
+     *
+     * @param int $offset the offset to be unset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->tokens[$offset]);
+        --$this->count;
+        for ($i = $offset; $i < $this->count; ++$i) {
+            $this->tokens[$i] = $this->tokens[$i + 1];
+        }
+        unset($this->tokens[$this->count]);
+    }
+}