From d3f86a517ff7c654835093f24c79a6df11826142 Mon Sep 17 00:00:00 2001
From: David Grudl <david@grudl.com>
Date: Sat, 28 May 2016 14:34:02 +0200
Subject: [PATCH] PhpWriter: added warning about deprecated variables

---
 src/Latte/PhpWriter.php          | 4 ++++
 tests/Latte/Compiler.errors.phpt | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/src/Latte/PhpWriter.php b/src/Latte/PhpWriter.php
index 8c4b6965c..f7a354231 100644
--- a/src/Latte/PhpWriter.php
+++ b/src/Latte/PhpWriter.php
@@ -174,12 +174,16 @@ public function preprocess(MacroTokens $tokens = NULL)
 	 */
 	public function validateTokens(MacroTokens $tokens)
 	{
+		$deprecatedVars = array_flip(['$template', '$_b', '$_l', '$_g', '$_args', '$_fi', '$_control', '$_presenter', '$_form', '$_input', '$_label', '$_snippetMode']);
 		$brackets = [];
 		$pos = $tokens->position;
 		while ($tokens->nextToken()) {
 			if ($tokens->isCurrent('?>')) {
 				throw new CompileException('Forbidden ?> inside macro');
 
+			} elseif ($tokens->isCurrent($tokens::T_VARIABLE) && isset($deprecatedVars[$tokens->currentValue()])) {
+				trigger_error("Variable {$tokens->currentValue()} is deprecated.", E_USER_DEPRECATED);
+
 			} elseif ($tokens->isCurrent($tokens::T_SYMBOL)
 				&& !$tokens->isPrev('::') && !$tokens->isPrev('->')
 				&& preg_match('#^[A-Z0-9]{3,}$#', $val = $tokens->currentValue())
diff --git a/tests/Latte/Compiler.errors.phpt b/tests/Latte/Compiler.errors.phpt
index b7d1c55c1..96dab5f50 100644
--- a/tests/Latte/Compiler.errors.phpt
+++ b/tests/Latte/Compiler.errors.phpt
@@ -94,3 +94,7 @@ Assert::exception(function () use ($latte) {
 Assert::noError(function () use ($latte) {
 	$latte->compile('{php function () { yield; }}');
 });
+
+Assert::error(function () use ($latte) {
+	$latte->compile('{$_form[$name]}');
+}, E_USER_DEPRECATED, 'Variable $_form is deprecated.');