From ba40208daa839870bc0d5faaf2c3bc52dbd4a941 Mon Sep 17 00:00:00 2001
From: Ondrej Mirtes <ondrej@mirtes.cz>
Date: Wed, 26 Aug 2020 19:46:51 +0200
Subject: [PATCH] Cut memory consumption

---
 conf/config.neon                          |  1 -
 src/Parser/CachedParser.php               | 47 ++---------------------
 tests/PHPStan/Parser/CachedParserTest.php | 29 --------------
 3 files changed, 3 insertions(+), 74 deletions(-)

diff --git a/conf/config.neon b/conf/config.neon
index 9cfe233f20..b0c90007b2 100644
--- a/conf/config.neon
+++ b/conf/config.neon
@@ -493,7 +493,6 @@ services:
 		class: PHPStan\Parser\CachedParser
 		arguments:
 			originalParser: @directParser
-			cachedNodesByFileCountMax: %cache.nodesByFileCountMax%
 			cachedNodesByStringCountMax: %cache.nodesByStringCountMax%
 
 	-
diff --git a/src/Parser/CachedParser.php b/src/Parser/CachedParser.php
index 1185387610..4b27a9c4bd 100644
--- a/src/Parser/CachedParser.php
+++ b/src/Parser/CachedParser.php
@@ -2,18 +2,13 @@
 
 namespace PHPStan\Parser;
 
+use PHPStan\File\FileReader;
+
 class CachedParser implements Parser
 {
 
 	private \PHPStan\Parser\Parser $originalParser;
 
-	/** @var array<string, \PhpParser\Node\Stmt[]> */
-	private array $cachedNodesByFile = [];
-
-	private int $cachedNodesByFileCount = 0;
-
-	private int $cachedNodesByFileCountMax;
-
 	/** @var array<string, \PhpParser\Node\Stmt[]>*/
 	private array $cachedNodesByString = [];
 
@@ -23,12 +18,10 @@ class CachedParser implements Parser
 
 	public function __construct(
 		Parser $originalParser,
-		int $cachedNodesByFileCountMax,
 		int $cachedNodesByStringCountMax
 	)
 	{
 		$this->originalParser = $originalParser;
-		$this->cachedNodesByFileCountMax = $cachedNodesByFileCountMax;
 		$this->cachedNodesByStringCountMax = $cachedNodesByStringCountMax;
 	}
 
@@ -38,23 +31,7 @@ public function __construct(
 	 */
 	public function parseFile(string $file): array
 	{
-		if ($this->cachedNodesByFileCountMax !== 0 && $this->cachedNodesByFileCount >= $this->cachedNodesByFileCountMax) {
-			$this->cachedNodesByFile = array_slice(
-				$this->cachedNodesByFile,
-				1,
-				null,
-				true
-			);
-
-			--$this->cachedNodesByFileCount;
-		}
-
-		if (!isset($this->cachedNodesByFile[$file])) {
-			$this->cachedNodesByFile[$file] = $this->originalParser->parseFile($file);
-			$this->cachedNodesByFileCount++;
-		}
-
-		return $this->cachedNodesByFile[$file];
+		return $this->parseString(FileReader::read($file));
 	}
 
 	/**
@@ -82,16 +59,6 @@ public function parseString(string $sourceCode): array
 		return $this->cachedNodesByString[$sourceCode];
 	}
 
-	public function getCachedNodesByFileCount(): int
-	{
-		return $this->cachedNodesByFileCount;
-	}
-
-	public function getCachedNodesByFileCountMax(): int
-	{
-		return $this->cachedNodesByFileCountMax;
-	}
-
 	public function getCachedNodesByStringCount(): int
 	{
 		return $this->cachedNodesByStringCount;
@@ -102,14 +69,6 @@ public function getCachedNodesByStringCountMax(): int
 		return $this->cachedNodesByStringCountMax;
 	}
 
-	/**
-	 * @return array<string, \PhpParser\Node[]>
-	 */
-	public function getCachedNodesByFile(): array
-	{
-		return $this->cachedNodesByFile;
-	}
-
 	/**
 	 * @return array<string, \PhpParser\Node[]>
 	 */
diff --git a/tests/PHPStan/Parser/CachedParserTest.php b/tests/PHPStan/Parser/CachedParserTest.php
index ca71124e28..b014507974 100644
--- a/tests/PHPStan/Parser/CachedParserTest.php
+++ b/tests/PHPStan/Parser/CachedParserTest.php
@@ -7,49 +7,24 @@ class CachedParserTest extends \PHPUnit\Framework\TestCase
 
 	/**
 	 * @dataProvider dataParseFileClearCache
-	 * @param int $cachedNodesByFileCountMax
 	 * @param int $cachedNodesByStringCountMax
-	 * @param int $cachedNodesByFileCountExpected
 	 * @param int $cachedNodesByStringCountExpected
 	 */
 	public function testParseFileClearCache(
-		int $cachedNodesByFileCountMax,
 		int $cachedNodesByStringCountMax,
-		int $cachedNodesByFileCountExpected,
 		int $cachedNodesByStringCountExpected
 	): void
 	{
 		$parser = new CachedParser(
 			$this->getParserMock(),
-			$cachedNodesByFileCountMax,
 			$cachedNodesByStringCountMax
 		);
 
-		$this->assertEquals(
-			$cachedNodesByFileCountMax,
-			$parser->getCachedNodesByFileCountMax()
-		);
-
 		$this->assertEquals(
 			$cachedNodesByStringCountMax,
 			$parser->getCachedNodesByStringCountMax()
 		);
 
-		// Add files to cache
-		for ($i = 0; $i <= $cachedNodesByFileCountMax; $i++) {
-			$parser->parseFile('file' . $i);
-		}
-
-		$this->assertEquals(
-			$cachedNodesByFileCountExpected,
-			$parser->getCachedNodesByFileCount()
-		);
-
-		$this->assertCount(
-			$cachedNodesByFileCountExpected,
-			$parser->getCachedNodesByFile()
-		);
-
 		// Add strings to cache
 		for ($i = 0; $i <= $cachedNodesByStringCountMax; $i++) {
 			$parser->parseString('string' . $i);
@@ -69,16 +44,12 @@ public function testParseFileClearCache(
 	public function dataParseFileClearCache(): \Generator
 	{
 		yield 'even' => [
-			'cachedNodesByFileCountMax' => 100,
 			'cachedNodesByStringCountMax' => 50,
-			'cachedNodesByFileCountExpected' => 100,
 			'cachedNodesByStringCountExpected' => 50,
 		];
 
 		yield 'odd' => [
-			'cachedNodesByFileCountMax' => 101,
 			'cachedNodesByStringCountMax' => 51,
-			'cachedNodesByFileCountExpected' => 101,
 			'cachedNodesByStringCountExpected' => 51,
 		];
 	}