Add convenience methods for accessing version and requirement classes

dependabot-core.gemspec

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "./lib/dependabot/version"
+require "./lib/dependabot"
 
 Gem::Specification.new do |spec|
   spec.name         = "dependabot-core"

lib/dependabot.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
 
 module Dependabot
+  VERSION = "0.52.29"
 end

lib/dependabot/requirement.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require "dependabot/update_checkers/python/pip/requirement"
+require "dependabot/update_checkers/java_script/npm_and_yarn/requirement"
+require "dependabot/update_checkers/php/composer/requirement"
+require "dependabot/update_checkers/elixir/hex/requirement"
+require "dependabot/update_checkers/rust/cargo/requirement"
+
+module Dependabot
+  module Requirement
+    def self.for_package_manager(package_manager)
+      case package_manager
+      when "bundler", "maven", "submodules", "docker" then Gem::Requirement
+      when "npm_and_yarn"
+        UpdateCheckers::JavaScript::NpmAndYarn::Requirement
+      when "pip" then UpdateCheckers::Python::Pip::Requirement
+      when "composer" then UpdateCheckers::Php::Composer::Requirement
+      when "hex" then UpdateCheckers::Elixir::Hex::Requirement
+      when "cargo" then UpdateCheckers::Rust::Cargo::Requirement
+      else raise "Unsupported package_manager #{package_manager}"
+      end
+    end
+  end
+end

lib/dependabot/update_checkers/python/pip/requirement.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "dependabot/update_checkers/python/pip"
 require "dependabot/update_checkers/python/pip/version"
 
 module Dependabot

lib/dependabot/version.rb

@@ -1,5 +1,31 @@
 # frozen_string_literal: true
 
+# These must be loaded first, or we get load order errors
+require "dependabot/update_checkers/python/pip/requirement"
+require "dependabot/update_checkers/elixir/hex/requirement"
+
+require "dependabot/update_checkers/python/pip/version"
+require "dependabot/update_checkers/java/maven/version"
+require "dependabot/update_checkers/java_script/npm_and_yarn/version"
+require "dependabot/update_checkers/php/composer/version"
+require "dependabot/update_checkers/elixir/hex/version"
+require "dependabot/update_checkers/rust/cargo/version"
+
 module Dependabot
-  VERSION = "0.52.29"
+  module Version
+    # rubocop:disable Metrics/CyclomaticComplexity
+    def self.for_package_manager(package_manager)
+      case package_manager
+      when "bundler", "submodules", "docker" then Gem::Version
+      when "maven" then UpdateCheckers::Java::Maven::Version
+      when "npm_and_yarn" then UpdateCheckers::JavaScript::NpmAndYarn::Version
+      when "pip" then UpdateCheckers::Python::Pip::Version
+      when "composer" then UpdateCheckers::Php::Composer::Version
+      when "hex" then UpdateCheckers::Elixir::Hex::Version
+      when "cargo" then UpdateCheckers::Rust::Cargo::Version
+      else raise "Unsupported package_manager #{package_manager}"
+      end
+    end
+    # rubocop:enable Metrics/CyclomaticComplexity
+  end
 end