From fb7bc161a72ee54d5c158675452cda746ea5e32a Mon Sep 17 00:00:00 2001
From: Douglas Resende <eu@douglasresende.com>
Date: Tue, 28 Apr 2020 11:22:53 -0300
Subject: [PATCH] version support

-added grammar support for firebird 1.5
-main version is 2.* (if has no information about grammar 2.* is
default)
---
 src/Firebird/Connection.php                   |  18 ++-
 .../Query/Grammars/Firebird15Grammar.php      | 112 ++++++++++++++++++
 2 files changed, 125 insertions(+), 5 deletions(-)
 create mode 100644 src/Firebird/Query/Grammars/Firebird15Grammar.php

diff --git a/src/Firebird/Connection.php b/src/Firebird/Connection.php
index 198f8df..b636414 100644
--- a/src/Firebird/Connection.php
+++ b/src/Firebird/Connection.php
@@ -3,7 +3,8 @@
 namespace Firebird;
 
 use Firebird\Query\Builder as QueryBuilder;
-use Firebird\Query\Grammars\Firebird25Grammar as QueryGrammar;
+use Firebird\Query\Grammars\Firebird15Grammar as QueryGrammar10;
+use Firebird\Query\Grammars\Firebird25Grammar as QueryGrammar20;
 use Firebird\Query\Grammars\Firebird30Grammar as QueryGrammar30;
 use Firebird\Query\Processors\FirebirdProcessor as Processor;
 use Firebird\Schema\Builder as SchemaBuilder;
@@ -56,14 +57,21 @@ protected function getMajorEngineVersion()
     /**
      * Get the default query grammar instance
      *
-     * @return Query\Grammars\Firebird25Grammar
+     * @return QueryGrammar10|QueryGrammar20|QueryGrammar30
      */
     protected function getDefaultQueryGrammar()
     {
-        if ($this->getMajorEngineVersion() >= 3) {
-            return new QueryGrammar30;
+        switch ($this->getMajorEngineVersion()){
+            case 1:
+                return new QueryGrammar10;
+                break;
+            case 3:
+                return new QueryGrammar30;
+                break;
+            default:
+                return new QueryGrammar20;
+                break;
         }
-        return new QueryGrammar;
     }
 
     /**
diff --git a/src/Firebird/Query/Grammars/Firebird15Grammar.php b/src/Firebird/Query/Grammars/Firebird15Grammar.php
new file mode 100644
index 0000000..00f60b8
--- /dev/null
+++ b/src/Firebird/Query/Grammars/Firebird15Grammar.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace Firebird\Query\Grammars;
+
+use Illuminate\Database\Query\Builder;
+use Illuminate\Database\Query\Grammars\Grammar;
+
+class Firebird15Grammar extends Grammar
+{
+
+    /**
+     * The components that make up a select clause.
+     *
+     * @var array
+     */
+    protected $selectComponents = array(
+        'aggregate',
+        'limit',
+        'offset',
+        'columns',
+        'from',
+        'joins',
+        'wheres',
+        'groups',
+        'havings',
+        'orders'
+    );
+
+    /**
+     * Compile the "select *" portion of the query.
+     * As Firebird adds the "limit" and "offset" after the "select", this must not work this way.
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  array  $columns
+     * @return string
+     */
+    protected function compileColumns(Builder $query, $columns)
+    {
+        // If the query is actually performing an aggregating select, we will let that
+        // compiler handle the building of the select clauses, as it will need some
+        // more syntax that is best handled by that function to keep things neat.
+        if ( ! is_null($query->aggregate)) return;
+        $select = '';
+        if (count($columns) > 0 && $query->limit == null && $query->aggregate == null)
+        {
+            $select = $query->distinct ? 'select distinct ' : 'select ';
+        }
+
+        return $select.$this->columnize($columns);
+    }
+
+    /**
+     * Compile a select query into SQL.
+     *
+     * @param  Illuminate\Database\Query\Builder
+     *
+     * @return string
+     */
+    public function compileSelect(Builder $query)
+    {
+        if (is_null($query->columns)) $query->columns = array('*');
+
+        return trim($this->concatenate($this->compileComponents($query)));
+    }
+
+    /**
+     * Compile an aggregated select clause.
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  array  $aggregate
+     * @return string
+     */
+    protected function compileAggregate(Builder $query, $aggregate)
+    {
+        $column = $this->columnize($aggregate['columns']);
+
+        // If the query has a "distinct" constraint and we're not asking for all columns
+        // we need to prepend "distinct" onto the column name so that the query takes
+        // it into account when it performs the aggregating operations on the data.
+        if ($query->distinct && $column !== '*')
+        {
+            $column = 'distinct '.$column;
+        }
+
+        return 'select '.$aggregate['function'].'('.$column.') as aggregate';
+    }
+
+    /**
+     * Compile first instead of limit
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  int  $limit
+     * @return string
+     */
+    protected function compileLimit(Builder $query, $limit)
+    {
+        return 'select first '.(int) $limit;
+    }
+
+    /**
+     * Compile skip instead of offset
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  int  $limit
+     * @return string
+     */
+    protected function compileOffset(Builder $query, $limit)
+    {
+        return 'skip '.(int) $limit;
+    }
+
+}