Initial commit

#pma/libraries/sql-parser/src/Components/ExpressionArray.php

@@ -0,0 +1,129 @@
+<?php
+
+/**
+ * Parses a list of expressions delimited by a comma.
+ *
+ * @package    SqlParser
+ * @subpackage Components
+ */
+namespace SqlParser\Components;
+
+use SqlParser\Component;
+use SqlParser\Parser;
+use SqlParser\Token;
+use SqlParser\TokensList;
+
+/**
+ * Parses a list of expressions delimited by a comma.
+ *
+ * @category   Keywords
+ * @package    SqlParser
+ * @subpackage Components
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
+ */
+class ExpressionArray extends Component
+{
+
+    /**
+     * @param Parser     $parser  The parser that serves as context.
+     * @param TokensList $list    The list of tokens that are being parsed.
+     * @param array      $options Parameters for parsing.
+     *
+     * @return Expression[]
+     */
+    public static function parse(Parser $parser, TokensList $list, array $options = array())
+    {
+        $ret = array();
+
+        /**
+         * The state of the parser.
+         *
+         * Below are the states of the parser.
+         *
+         *      0 ----------------------[ array ]---------------------> 1
+         *
+         *      1 ------------------------[ , ]------------------------> 0
+         *      1 -----------------------[ else ]----------------------> (END)
+         *
+         * @var int $state
+         */
+        $state = 0;
+
+        for (; $list->idx < $list->count; ++$list->idx) {
+            /**
+             * Token parsed at this moment.
+             *
+             * @var Token $token
+             */
+            $token = $list->tokens[$list->idx];
+
+            // End of statement.
+            if ($token->type === Token::TYPE_DELIMITER) {
+                break;
+            }
+
+            // Skipping whitespaces and comments.
+            if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
+                continue;
+            }
+
+            if (($token->type === Token::TYPE_KEYWORD)
+                && ($token->flags & Token::FLAG_KEYWORD_RESERVED)
+                && ((~$token->flags & Token::FLAG_KEYWORD_FUNCTION))
+                && ($token->value !== 'DUAL')
+                && ($token->value !== 'NULL')
+                && ($token->value !== 'CASE')
+            ) {
+                // No keyword is expected.
+                break;
+            }
+
+            if ($state === 0) {
+                if ($token->type === Token::TYPE_KEYWORD
+                    && $token->value === 'CASE'
+                ) {
+                    $expr = CaseExpression::parse($parser, $list, $options);
+                } else {
+                    $expr = Expression::parse($parser, $list, $options);
+                }
+
+                if ($expr === null) {
+                    break;
+                }
+                $ret[] = $expr;
+                $state = 1;
+            } elseif ($state === 1) {
+                if ($token->value === ',') {
+                    $state = 0;
+                } else {
+                    break;
+                }
+            }
+        }
+
+        if ($state === 0) {
+            $parser->error(
+                __('An expression was expected.'),
+                $list->tokens[$list->idx]
+            );
+        }
+
+        --$list->idx;
+        return $ret;
+    }
+
+    /**
+     * @param Expression[] $component The component to be built.
+     * @param array        $options   Parameters for building.
+     *
+     * @return string
+     */
+    public static function build($component, array $options = array())
+    {
+        $ret = array();
+        foreach ($component as $frag) {
+            $ret[] = $frag::build($frag);
+        }
+        return implode($ret, ', ');
+    }
+}