From 2d197e3e1265d9f5aa75306bec59cea6d3091043 Mon Sep 17 00:00:00 2001
From: Matt Brown <github@muglug.com>
Date: Sun, 28 Mar 2021 23:45:45 -0400
Subject: [PATCH] Allow older composer/semver cc @xurizaemon

---
 composer.json        | 2 +-
 src/Psalm/Config.php | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/composer.json b/composer.json
index cc093f0fb1d..f8395c56985 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
         "amphp/amp": "^2.4.2",
         "amphp/byte-stream": "^1.5",
         "composer/package-versions-deprecated": "^1.8.0",
-        "composer/semver": "^2.0 || ^3.0",
+        "composer/semver": "^1.4 || ^2.0 || ^3.0",
         "composer/xdebug-handler": "^1.1",
         "dnoegel/php-xdg-base-dir": "^0.1.1",
         "felixfbecker/advanced-json-rpc": "^3.0.3",
diff --git a/src/Psalm/Config.php b/src/Psalm/Config.php
index 62bb9a42485..065488e714e 100644
--- a/src/Psalm/Config.php
+++ b/src/Psalm/Config.php
@@ -2064,14 +2064,17 @@ private function getPHPVersionFromComposerJson(): ?string
 
             if (\is_string($php_version)) {
                 $version_parser = new VersionParser();
-                $min_php_version = $version_parser->parseConstraints($php_version)->getLowerBound()->getVersion();
+
+                $constraint = $version_parser->parseConstraints($php_version);
+
                 foreach (['5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0'] as $candidate) {
-                    if (Semver::satisfies($min_php_version, "~$candidate.0")) {
+                    if ($constraint->matches(new \Composer\Semver\Constraint\Constraint('<=', "$candidate.0.0-dev"))) {
                         return $candidate;
                     }
                 }
             }
         }
+
         return null;
     }