From 3bb174a10985953dc3a909e67e893bb4bc4102be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Capote=20P=C3=A9rez-Andreu?=
 <carlos.capote@hawara.es>
Date: Sat, 20 May 2023 15:45:31 +0100
Subject: [PATCH] feat: string concatenation

---
 src/Function/String/Concat.php       | 26 ++++++++++++++++++++++++++
 tests/Function/String/ConcatTest.php | 13 +++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 src/Function/String/Concat.php
 create mode 100644 tests/Function/String/ConcatTest.php

diff --git a/src/Function/String/Concat.php b/src/Function/String/Concat.php
new file mode 100644
index 0000000..8280b76
--- /dev/null
+++ b/src/Function/String/Concat.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tpetry\QueryExpressions\Function\String;
+
+use Illuminate\Contracts\Database\Query\Expression;
+use Illuminate\Database\Grammar;
+use Tpetry\QueryExpressions\Concerns\IdentifiesDriver;
+use Tpetry\QueryExpressions\Function\Conditional\ManyArgumentsExpression;
+
+class Concat extends ManyArgumentsExpression implements Expression
+{
+    use IdentifiesDriver;
+
+    public function getValue(Grammar $grammar)
+    {
+        $expressions = $this->getExpressions($grammar);
+        $expressionsStr = implode(', ', $expressions);
+
+        return match ($this->identify($grammar)) {
+            'mysql', 'pgsql', 'sqlsrv' => "concat({$expressionsStr})",
+            'sqlite' => implode(' || ', $expressions),
+        };
+    }
+}
diff --git a/tests/Function/String/ConcatTest.php b/tests/Function/String/ConcatTest.php
new file mode 100644
index 0000000..24c051e
--- /dev/null
+++ b/tests/Function/String/ConcatTest.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+use Tpetry\QueryExpressions\Function\String\Concat;
+
+it('can concatenate string values')
+    ->expect(new Concat(['Hello', ' ', 'World']))
+    ->toBeExecutable()
+    ->toBeMysql('concat(`Hello`, ` `, `World`)')
+    ->toBePgsql('concat("Hello", " ", "World")')
+    ->toBeSqlite('"Hello" || " " || "World"')
+    ->toBeSqlsrv('concat([Hello], [ ], [World])');