https://git.ruby-lang.org/ruby.git/commit/?id=ab89c45b90

From ab89c45b906380353d1b399781170cafe1d7b503 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Fri, 26 Mar 2021 22:46:40 +0900
Subject: [ruby/irb] Evaluate each toplevel statement

https://github.com/ruby/irb/commit/bc1b1d8bc3
---
 lib/irb/input-method.rb                  |  8 +--
 lib/irb/ruby-lex.rb                      | 69 +++++++++++++++++++++--
 test/irb/yamatanooroti/test_rendering.rb | 96 ++++++++++++++++++++++++++++----
 3 files changed, 151 insertions(+), 22 deletions(-)

diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index df73cee..1854567 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -316,13 +316,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L316
       Reline.output = @stdout
       Reline.prompt_proc = @prompt_proc
       Reline.auto_indent_proc = @auto_indent_proc if @auto_indent_proc
-
-      l = readmultiline(@prompt, false) do |line|
-        next false if Reline::IOGate.in_pasting?
-        @check_termination_proc.call(line)
-      end
-
-      if l
+      if l = readmultiline(@prompt, false, &@check_termination_proc)
         HISTORY.push(l) if !l.empty?
         @line[@line_no += 1] = l + "\n"
       else
diff --git a/lib/irb/ruby-lex.rb b/lib/irb/ruby-lex.rb
index 586ac39..82df06d 100644
--- a/lib/irb/ruby-lex.rb
+++ b/lib/irb/ruby-lex.rb
@@ -47,12 +47,26 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L47
     @io = io
     if @io.respond_to?(:check_termination)
       @io.check_termination do |code|
-        code.gsub!(/\s*\z/, '').concat("\n")
-        ltype, indent, continue, code_block_open = check_state(code)
-        if ltype or indent > 0 or continue or code_block_open
-          false
+        if Reline::IOGate.in_pasting?
+          lex = RubyLex.new
+          rest = lex.check_termination_in_prev_line(code)
+          if rest
+            Reline.delete_text
+            rest.bytes.reverse_each do |c|
+              Reline.ungetc(c)
+            end
+            true
+          else
+            false
+          end
         else
-          true
+          code.gsub!(/\s*\z/, '').concat("\n")
+          ltype, indent, continue, code_block_open = check_state(code)
+          if ltype or indent > 0 or continue or code_block_open
+            false
+          else
+            true
+          end
         end
       end
     end
@@ -739,5 +753,50 @@ class RubyLex https://github.com/ruby/ruby/blob/trunk/lib/irb/ruby-lex.rb#L753
       nil
     end
   end
+
+  def check_termination_in_prev_line(code)
+    tokens = self.class.ripper_lex_without_warning(code)
+    past_first_newline = false
+    index = tokens.rindex do |t|
+      # traverse first token before last line
+      if past_first_newline
+        if t.tok.include?("\n")
+          true
+        end
+      elsif t.tok.include?("\n")
+        past_first_newline = true
+        false
+      else
+        false
+      end
+    end
+    if index
+      first_token = nil
+      last_line_tokens = tokens[(index + 1)..(tokens.size - 1)]
+      last_line_tokens.each do |t|
+        unless [:on_sp, :on_ignored_sp, :on_comment].include?(t.event)
+          first_token = t
+          break
+        end
+      end
+      if first_token.nil?
+        return false
+      elsif first_token && first_token.state == Ripper::EXPR_DOT
+        return false
+      else
+        tokens_without_last_line = tokens[0..index]
+        ltype = process_literal_type(tokens_without_last_line)
+        indent = process_nesting_level(tokens_without_last_line)
+        continue = process_continue(tokens_without_last_line)
+        code_block_open = check_code_block(tokens_without_last_line.map(&:tok).join(''), tokens_without_last_line)
+        if ltype or indent > 0 or continue or code_block_open
+          return false
+        else
+          return last_line_tokens.map(&:tok).join('')
+        end
+      end
+    end
+    false
+  end
 end
 # :startdoc:
diff --git a/test/irb/yamatanooroti/test_rendering.rb b/test/irb/yamatanooroti/test_rendering.rb
index 171bfea..8f55b38 100644
--- a/test/irb/yamatanooroti/test_rendering.rb
+++ b/test/irb/yamatanooroti/test_rendering.rb
@@ -49,6 +49,7 @@ begin https://github.com/ruby/ruby/blob/trunk/test/irb/yamatanooroti/test_rendering.rb#L49
       start_terminal(25, 80, %W{ruby -I#{@pwd}/lib -I#{@pwd}/../reline/lib #{@pwd}/exe/irb}, startup_message: 'start IRB')
       write(<<~EOC)
         class A
+          def inspect; '#<A>'; end
           def a; self; end
           def b; true; end
         end
@@ -63,17 +64,92 @@ begin https://github.com/ruby/ruby/blob/trunk/test/irb/yamatanooroti/test_rendering.rb#L64
       assert_screen(<<~EOC)
         start IRB
         irb(main):001:1* class A
-        irb(main):002:1*   def a; self; end
-        irb(main):003:1*   def b; true; end
-        irb(main):004:0> end
-        irb(main):005:0*
-        irb(main):006:0> a = A.new
-        irb(main):007:0*
-        irb(main):008:0> a
-        irb(main):009:0>  .a
-        irb(main):010:0>  .b
+        irb(main):002:1*   def inspect; '#<A>'; end
+        irb(main):003:1*   def a; self; end
+        irb(main):004:1*   def b; true; end
+        irb(main):005:0> end
+        => :b
+        irb(main):006:0>
+        irb(main):007:0> a = A.new
+        => #<A>
+        irb(main):008:0>
+        irb(main):009:0> a
+        irb(main):010:0>  .a
+        irb(main):011:0>  .b
         => true
-        irb(main):011:0>
+        irb(main):012:0>
+      EOC
+    end
+
+    def test_evaluate_each_toplevel_statement_by_multiline_paste
+      write_irbrc <<~'LINES'
+        puts 'start IRB'
+      LINES
+      start_terminal(40, 80, %W{ruby -I#{@pwd}/lib -I#{@pwd}/../reline/lib #{@pwd}/exe/irb}, startup_message: 'start IRB')
+      write(<<~EOC)
+        class A
+          def inspect; '#<A>'; end
+          def b; self; end
+          def c; true; end
+        end
+
+        a = A.new
+
+        a
+          .b
+          # aaa
+          .c
+
+        (a)
+          &.b()
+
+
+        class A def b; self; end; def c; true; end; end;
+        a = A.new
+        a
+          .b
+          # aaa
+          .c
+        (a)
+          &.b()
+      EOC
+      close
+      assert_screen(<<~EOC)
+        start IRB
+        irb(main):001:1* class A
+        irb(main):002:1*   def inspect; '#<A>'; end
+        irb(main):003:1*   def b; self; end
+        irb(main):004:1*   def c; true; end
+        irb(main):005:0> end
+        => :c
+        irb(main):006:0>
+        irb(main):007:0> a = A.new
+        => #<A>
+        irb(main):008:0>
+        irb(main):009:0> a
+        irb(main):010:0>   .b
+        irb(main):011:0>   # aaa
+        irb(main):012:0>   .c
+        => true
+        irb(main):013:0>
+        irb(main):014:0> (a)
+        irb(main):015:0>   &.b()
+        => #<A>
+        irb(main):016:0>
+        irb(main):017:0>
+        irb(main):018:0> class A def b; self; end; def c; true; end; end;
+        => :c
+        irb(main):019:0> a = A.new
+        => #<A>
+        irb(main):020:0> a
+        irb(main):021:0>   .b
+        irb(main):022:0>   # aaa
+        irb(main):023:0>   .c
+        => true
+        irb(main):024:0> (a)
+        irb(main):025:0>   &.b()
+        => #<A>
+        irb(main):026:0>
       EOC
     end
 
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