[ruby/syntax_suggest] Update standardrb to Ruby 3.0 standards

https://github.com/ruby/syntax_suggest/commit/2771dcabe0

lib/syntax_suggest/clean_document.rb

@@ -224,7 +224,7 @@ module SyntaxSuggest
     #
     def join_consecutive!
       consecutive_groups = @document.select(&:ignore_newline_not_beg?).map do |code_line|
-        take_while_including(code_line.index..-1) do |line|
+        take_while_including(code_line.index..) do |line|
           line.ignore_newline_not_beg?
         end
       end
@@ -245,7 +245,7 @@ module SyntaxSuggest
     #     expect(lines[1].to_s).to eq("")
     def join_trailing_slash!
       trailing_groups = @document.select(&:trailing_slash?).map do |code_line|
-        take_while_including(code_line.index..-1) { |x| x.trailing_slash? }
+        take_while_including(code_line.index..) { |x| x.trailing_slash? }
       end
       join_groups(trailing_groups)
       self
@@ -279,7 +279,7 @@ module SyntaxSuggest
         )
 
         # Hide the rest of the lines
-        lines[1..-1].each do |line|
+        lines[1..].each do |line|
           # The above lines already have newlines in them, if add more
           # then there will be double newline, use an empty line instead
           @document[line.index] = CodeLine.new(line: "", index: line.index, lex: [])
@@ -293,7 +293,7 @@ module SyntaxSuggest
     # Like `take_while` except when it stops
     # iterating, it also returns the line
     # that caused it to stop
-    def take_while_including(range = 0..-1)
+    def take_while_including(range = 0..)
       take_next_and_stop = false
       @document[range].take_while do |line|
         next if take_next_and_stop

lib/syntax_suggest/lex_all.rb

@@ -17,7 +17,7 @@ module SyntaxSuggest
       last_lineno = source_lines.length
 
       until lineno >= last_lineno
-        lines = source_lines[lineno..-1]
+        lines = source_lines[lineno..]
 
         @lex.concat(
           Ripper::Lexer.new(lines.join, "-", lineno + 1).parse.sort_by(&:pos)

lib/syntax_suggest/scan_history.rb

@@ -118,7 +118,7 @@ module SyntaxSuggest
     # Returns an array of all the CodeLines that exist after
     # the currently scanned block
     private def after_lines
-      @code_lines[@after_index.next..-1] || []
+      @code_lines[@after_index.next..] || []
     end
 
     private def current

spec/syntax_suggest/unit/capture_code_context_spec.rb

@@ -94,7 +94,7 @@ module SyntaxSuggest
       code_lines = CleanDocument.new(source: source).call.lines
 
       code_lines[0..75].each(&:mark_invisible)
-      code_lines[77..-1].each(&:mark_invisible)
+      code_lines[77..].each(&:mark_invisible)
       expect(code_lines.join.strip).to eq("class Lookups")
 
       block = CodeBlock.new(lines: code_lines[76..149])
@@ -123,7 +123,7 @@ module SyntaxSuggest
 
       code_lines = CleanDocument.new(source: source).call.lines
       block = CodeBlock.new(lines: code_lines)
-      code_lines[1..-1].each(&:mark_invisible)
+      code_lines[1..].each(&:mark_invisible)
 
       expect(block.to_s.strip).to eq("class Dog")
 

spec/syntax_suggest/unit/clean_document_spec.rb

@@ -85,7 +85,7 @@ module SyntaxSuggest
       code_lines = doc.lines
 
       expect(code_lines[0].to_s.count($/)).to eq(5)
-      code_lines[1..-1].each do |line|
+      code_lines[1..].each do |line|
         expect(line.to_s.strip.length).to eq(0)
       end
     end