Raise minimum prism version and fix deprecations

Prism 0.28.0 introduced a few breaking changes. In order to keep our code
simple, we've raised the minimum dependency version for prism.

Gemfile.lock

@@ -3,7 +3,7 @@ PATH
   specs:
     spoom (1.3.2)
       erubi (>= 1.10.0)
-      prism (>= 0.19.0)
+      prism (>= 0.28.0)
       sorbet-static-and-runtime (>= 0.5.10187)
       thor (>= 0.19.2)
 

lib/spoom/deadcode/indexer.rb

@@ -151,10 +151,19 @@ def visit_constant_or_write_node(node)
         visit(node.value)
       end
 
+      sig { override.params(node: Prism::ConstantPathNode).void }
+      def visit_constant_path_node(node)
+        parent = node.parent
+
+        visit(parent) if parent
+        reference_constant(node.name.to_s, node)
+      end
+
       sig { override.params(node: Prism::ConstantPathWriteNode).void }
       def visit_constant_path_write_node(node)
-        parent = node.target.parent
-        name = node.target.child.slice
+        const_path_node = node.target
+        parent = const_path_node.parent
+        name = const_path_node.name.to_s
 
         if parent
           visit(parent)

spoom.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency("rake", "~> 13.2.1")
 
   spec.add_dependency("erubi", ">= 1.10.0")
-  spec.add_dependency("prism", ">= 0.19.0")
+  spec.add_dependency("prism", ">= 0.28.0")
   spec.add_dependency("sorbet-static-and-runtime", ">= 0.5.10187")
   spec.add_dependency("thor", ">= 0.19.2")
 

test/spoom/deadcode/index_definitions_test.rb

@@ -21,7 +21,7 @@ def foo(
         puts exception.message
         assert_equal(<<~ERRORS, exception.message)
           Error while parsing foo.rb:
-          - expected a `)` to close the parameters (at 1:8)
+          - unexpected end of file; expected a `)` to close the parameters (at 2:0)
           - unexpected end of file, assuming it is closing the parent top level context (at 2:0)
           - expected an `end` to close the `def` statement (at 1:8)
         ERRORS