Supports SHOW INDEX syntax

Author: Javakky-pxv

src/FakePdoStatementTrait.php

@@ -243,6 +243,10 @@ function ($row) {
 
                 break;
 
+            case Query\ShowIndexQuery::class:
+                $this->result = Processor\ShowIndexProcessor::process($this->conn, $parsed_query->table);
+                break;
+
             default:
                 throw new \UnexpectedValueException('Unsupported operation type ' . $sql);
         }

src/Parser/ShowParser.php

@@ -1,6 +1,7 @@
 <?php
 namespace Vimeo\MysqlEngine\Parser;
 
+use Vimeo\MysqlEngine\Query\ShowIndexQuery;
 use Vimeo\MysqlEngine\TokenType;
 use Vimeo\MysqlEngine\Query\ShowTablesQuery;
 
@@ -33,18 +34,33 @@ public function __construct(array $tokens, string $sql)
         $this->sql = $sql;
     }
 
-    public function parse() : ShowTablesQuery
+    /**
+     * @return ShowTablesQuery|ShowIndexQuery
+     * @throws ParserException
+     */
+    public function parse()
     {
         if ($this->tokens[$this->pointer]->value !== 'SHOW') {
             throw new ParserException("Parser error: expected SHOW");
         }
 
         $this->pointer++;
 
-        if ($this->tokens[$this->pointer]->value !== 'TABLES') {
-            throw new ParserException("Parser error: expected SHOW TABLES");
+        switch ($this->tokens[$this->pointer]->value) {
+            case 'TABLES':
+                return $this->parseShowTables();
+            case 'INDEX':
+            case 'INDEXES':
+            case 'KEYS':
+                return $this->parseShowIndex();
+            default:
+                throw new ParserException("Parser error: expected SHOW TABLES");
         }
 
+    }
+
+    private function parseShowTables()
+    {
         $this->pointer++;
 
         if ($this->tokens[$this->pointer]->value !== 'LIKE') {
@@ -61,4 +77,19 @@ public function parse() : ShowTablesQuery
 
         return new ShowTablesQuery($token->value, $this->sql);
     }
+
+    private function parseShowIndex()
+    {
+        $this->pointer++;
+
+        if ($this->tokens[$this->pointer]->value !== 'FROM') {
+            throw new ParserException("Parser error: expected SHOW INDEX FROM");
+        }
+        $this->pointer++;
+        $token = $this->tokens[$this->pointer];
+        if ($token === null || $token->type !== TokenType::IDENTIFIER) {
+            throw new ParserException("Expected table name after FROM");
+        }
+        return new ShowIndexQuery($token->value, $this->sql);
+    }
 }

src/Processor/ShowIndexProcessor.php

@@ -0,0 +1,58 @@
+<?php
+
+
+namespace Vimeo\MysqlEngine\Processor;
+
+
+use Vimeo\MysqlEngine\FakePdoInterface;
+
+class ShowIndexProcessor extends Processor
+{
+    public static function process(
+        FakePdoInterface $conn,
+        string $table
+    ): array
+    {
+        $result = [];
+        [$database, $table] = Processor::parseTableName($conn, $table);
+        $table_definition = $conn->getServer()->getTableDefinition(
+            $database,
+            $table
+        );
+        foreach ($table_definition->indexes as $name => $index) {
+            foreach ($index->columns as $i => $column) {
+                $result[] = [
+                    'Table' => $table_definition->name,
+                    'Non_unique' => $index->type === 'INDEX' ? 1 : 0,
+                    'Key_name' => $name,
+                    'Seq_in_index' => $i+1,
+                    'Column_name' => $column,
+                    /*
+                     * https://dev.mysql.com/doc/refman/5.6/ja/create-index.html
+                     * index_col_name の指定を ASC または DESC で終了させることができます。
+                     * これらのキーワードは、インデックス値の昇順または降順での格納を指定する将来の拡張のために許可されています。
+                     * 現在、これらは解析されますが、無視されます。インデックス値は、常に昇順で格納されます。
+                     */
+                    'Collation' => 'A',
+                    /*
+                     * https://dev.mysql.com/doc/refman/5.6/ja/analyze-table.html
+                     * ANALYZE TABLE が未実装のため null
+                     */
+                    'Cardinality' => null,
+                    //  Index には "length" がない(CreateIndex の $cols にはある)ため null
+                    'Sub_part' => null,
+                    // PACK_KEYS が未実装のため null
+                    'Packed' => null,
+                    'Null' => $table_definition->columns[$column]->isNullable ? 'YES' : '',
+                    // Index には $mode がない(CreateIndex にはある)ため null
+                    'Index_type' => null,
+                    // DISABLE KEYS 未実装のため ''
+                    'Comment' => '',
+                    // CREATE TABLE の INDEX COMMENT がスキップされているので ''
+                    'Index_comment' => ''
+                ];
+            }
+        }
+        return $result;
+    }
+}

src/Query/ShowIndexQuery.php

@@ -0,0 +1,21 @@
+<?php
+namespace Vimeo\MysqlEngine\Query;
+
+final class ShowIndexQuery
+{
+    /**
+     * @var string
+     */
+    public $table;
+
+    /**
+     * @var string
+     */
+    public $sql;
+
+    public function __construct(string $table, string $sql)
+    {
+        $this->table = $table;
+        $this->sql = $sql;
+    }
+}

tests/ShowIndexParseTest.php

@@ -0,0 +1,35 @@
+<?php
+namespace Vimeo\MysqlEngine\Tests;
+
+class ShowIndexParseTest extends \PHPUnit\Framework\TestCase
+{
+    public function testSimpleParse()
+    {
+        $query = 'SHOW INDEX FROM foo';
+
+        $show_query = \Vimeo\MysqlEngine\Parser\SQLParser::parse($query);
+
+        $this->assertInstanceOf(\Vimeo\MysqlEngine\Query\ShowIndexQuery::class, $show_query);
+        $this->assertSame('foo', $show_query->table);
+    }
+
+    public function testIndexesParse()
+    {
+        $query = 'SHOW INDEXES FROM foo';
+
+        $show_query = \Vimeo\MysqlEngine\Parser\SQLParser::parse($query);
+
+        $this->assertInstanceOf(\Vimeo\MysqlEngine\Query\ShowIndexQuery::class, $show_query);
+        $this->assertSame('foo', $show_query->table);
+    }
+
+    public function testKeysParse()
+    {
+        $query = 'SHOW KEYS FROM foo';
+
+        $show_query = \Vimeo\MysqlEngine\Parser\SQLParser::parse($query);
+
+        $this->assertInstanceOf(\Vimeo\MysqlEngine\Query\ShowIndexQuery::class, $show_query);
+        $this->assertSame('foo', $show_query->table);
+    }
+}