From d03e95d134a070c395d5bf904ba154d443de46e3 Mon Sep 17 00:00:00 2001
From: Fred Snyder <fsnyder@castwide.com>
Date: Tue, 11 Aug 2020 18:06:28 -0400
Subject: [PATCH] Treat for loops as closures (#349)

---
 .../parser/rubyvm/node_processors.rb          |  1 +
 .../rubyvm/node_processors/args_node.rb       | 44 ++++++++++++++-----
 spec/source_map/mapper_spec.rb                | 12 +++++
 3 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/lib/solargraph/parser/rubyvm/node_processors.rb b/lib/solargraph/parser/rubyvm/node_processors.rb
index 741a060ff..457b98bb2 100644
--- a/lib/solargraph/parser/rubyvm/node_processors.rb
+++ b/lib/solargraph/parser/rubyvm/node_processors.rb
@@ -54,6 +54,7 @@ module NodeProcessor
       register :KW_ARG,     Rubyvm::NodeProcessors::KwArgNode
       register :ITER,       Rubyvm::NodeProcessors::BlockNode
       register :LAMBDA,     Rubyvm::NodeProcessors::BlockNode
+      register :FOR,        Rubyvm::NodeProcessors::BlockNode
       register :OP_ASGN_OR, Rubyvm::NodeProcessors::OrasgnNode
       register :LIT,        Rubyvm::NodeProcessors::LitNode
     end
diff --git a/lib/solargraph/parser/rubyvm/node_processors/args_node.rb b/lib/solargraph/parser/rubyvm/node_processors/args_node.rb
index 57c3c6c73..48903feb1 100644
--- a/lib/solargraph/parser/rubyvm/node_processors/args_node.rb
+++ b/lib/solargraph/parser/rubyvm/node_processors/args_node.rb
@@ -7,16 +7,30 @@ module NodeProcessors
         class ArgsNode < Parser::NodeProcessor::Base
           def process
             if region.closure.is_a?(Pin::BaseMethod) || region.closure.is_a?(Pin::Block)
-              node.children[0].times do |i|
-                locals.push Solargraph::Pin::Parameter.new(
-                  location: region.closure.location,
-                  closure: region.closure,
-                  comments: comments_for(node),
-                  name: region.lvars[i].to_s,
-                  presence: region.closure.location.range,
-                  decl: :arg
-                )
-                region.closure.parameters.push locals.last
+              if region.lvars[0].nil?
+                node.children[0].times do |i|
+                  locals.push Solargraph::Pin::Parameter.new(
+                    location: region.closure.location,
+                    closure: region.closure,
+                    comments: comments_for(node),
+                    name: extract_name(node.children[i + 1]),
+                    presence: region.closure.location.range,
+                    decl: :arg
+                  )
+                  region.closure.parameters.push locals.last
+                end
+              else
+                node.children[0].times do |i|
+                  locals.push Solargraph::Pin::Parameter.new(
+                    location: region.closure.location,
+                    closure: region.closure,
+                    comments: comments_for(node),
+                    name: region.lvars[i].to_s,
+                    presence: region.closure.location.range,
+                    decl: :arg
+                  )
+                  region.closure.parameters.push locals.last
+                end
               end
               # @todo Optional args, keyword args, etc.
               if node.children[6]
@@ -55,6 +69,16 @@ def process
             end
             process_children
           end
+
+          private
+
+          def extract_name var
+            if Parser.is_ast_node?(var)
+              var.children[0].to_s
+            else
+              var.to_s
+            end
+          end
         end
       end
     end
diff --git a/spec/source_map/mapper_spec.rb b/spec/source_map/mapper_spec.rb
index 74d7a7130..3e02301b1 100644
--- a/spec/source_map/mapper_spec.rb
+++ b/spec/source_map/mapper_spec.rb
@@ -1457,4 +1457,16 @@ def bar; end
     bar = map.first_pin('Foo#bar')
     expect(bar).to be_explicit
   end
+
+  it 'separates parameters from local variables' do
+    map = Solargraph::SourceMap.load_string(%(
+      def foo(bar)
+        for i in (bar.length - 1).downto(0) do
+          puts bar[i]
+        end
+      end
+    ))
+    pin = map.first_pin('#foo')
+    expect(pin.parameters.length).to eq(1)
+  end
 end