[ruby/reline] Combine MAPPINGS(single byte input to symbol) with

key_bindings(escape sequence to symbol)
(https://github.com/ruby/reline/pull/715)

https://github.com/ruby/reline/commit/6a7e249374

8 files changed, 483 insertions, 529 deletions

diff --git a/lib/reline.rb b/lib/reline.rb
index 9af3a5c332..671c222ef7 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -17,10 +17,12 @@ module Reline
 
   class ConfigEncodingConversionError < StandardError; end
 
-  Key = Struct.new(:char, :combined_char, :with_meta) do
+  # EOF key: { char: nil, method_symbol: nil }
+  # Other key: { char: String, method_symbol: Symbol }
+  Key = Struct.new(:char, :method_symbol, :unused_boolean) do
     # For dialog_proc `key.match?(dialog.name)`
     def match?(sym)
-      combined_char.is_a?(Symbol) && combined_char == sym
+      method_symbol && method_symbol == sym
     end
   end
   CursorPos = Struct.new(:x, :y)
@@ -341,7 +343,7 @@ module Reline
           read_io(config.keyseq_timeout) { |inputs|
             line_editor.set_pasting_state(io_gate.in_pasting?)
             inputs.each do |key|
-              if key.char == :bracketed_paste_start
+              if key.method_symbol == :bracketed_paste_start
                 text = io_gate.read_bracketed_paste
                 line_editor.insert_multiline_text(text)
                 line_editor.scroll_into_view
diff --git a/lib/reline/io/windows.rb b/lib/reline/io/windows.rb
index 058d65c473..5c1ab6d080 100644
--- a/lib/reline/io/windows.rb
+++ b/lib/reline/io/windows.rb
@@ -55,7 +55,6 @@ class Reline::Windows < Reline::IO
       [224, 83] => :key_delete,      # Del
       [224, 71] => :ed_move_to_beg,  # Home
       [224, 79] => :ed_move_to_end,  # End
-      [  0, 41] => :ed_unassigned,   # input method on/off
       [  0, 72] => :ed_prev_history, # ↑
       [  0, 80] => :ed_next_history, # ↓
       [  0, 77] => :ed_next_char,    # →
diff --git a/lib/reline/key_actor/base.rb b/lib/reline/key_actor/base.rb
index ee28c7681e..5bd8609cdf 100644
--- a/lib/reline/key_actor/base.rb
+++ b/lib/reline/key_actor/base.rb
@@ -1,12 +1,18 @@
 class Reline::KeyActor::Base
-  def initialize(mapping = [])
-    @mapping = mapping
+  def initialize(mappings = nil)
     @matching_bytes = {}
     @key_bindings = {}
+    add_mappings(mappings) if mappings
   end
 
-  def get_method(key)
-    @mapping[key]
+  def add_mappings(mappings)
+    add([27], :ed_ignore)
+    128.times do |key|
+      func = mappings[key]
+      meta_func = mappings[key | 0b10000000]
+      add([key], func) if func
+      add([27, key], meta_func) if meta_func
+    end
   end
 
   def add(key, func)
diff --git a/lib/reline/key_actor/emacs.rb b/lib/reline/key_actor/emacs.rb
index ad84ee1d99..1ed4af7684 100644
--- a/lib/reline/key_actor/emacs.rb
+++ b/lib/reline/key_actor/emacs.rb
@@ -15,7 +15,7 @@ module Reline::KeyActor
     #   6 ^F
     :ed_next_char,
     #   7 ^G
-    :ed_unassigned,
+    nil,
     #   8 ^H
     :em_delete_prev_char,
     #   9 ^I
@@ -49,19 +49,19 @@ module Reline::KeyActor
     #  23 ^W
     :em_kill_region,
     #  24 ^X
-    :ed_unassigned,
+    nil,
     #  25 ^Y
     :em_yank,
     #  26 ^Z
     :ed_ignore,
     #  27 ^[
-    :ed_unassigned,
+    nil,
     #  28 ^\
     :ed_ignore,
     #  29 ^]
     :ed_ignore,
     #  30 ^^
-    :ed_unassigned,
+    nil,
     #  31 ^_
     :undo,
     #  32 SPACE
@@ -257,101 +257,101 @@ module Reline::KeyActor
     # 127 ^?
     :em_delete_prev_char,
     # 128 M-^@
-    :ed_unassigned,
+    nil,
     # 129 M-^A
-    :ed_unassigned,
+    nil,
     # 130 M-^B
-    :ed_unassigned,
+    nil,
     # 131 M-^C
-    :ed_unassigned,
+    nil,
     # 132 M-^D
-    :ed_unassigned,
+    nil,
     # 133 M-^E
-    :ed_unassigned,
+    nil,
     # 134 M-^F
-    :ed_unassigned,
+    nil,
     # 135 M-^G
-    :ed_unassigned,
+    nil,
     # 136 M-^H
     :ed_delete_prev_word,
     # 137 M-^I
-    :ed_unassigned,
+    nil,
     # 138 M-^J
     :key_newline,
     # 139 M-^K
-    :ed_unassigned,
+    nil,
     # 140 M-^L
     :ed_clear_screen,
     # 141 M-^M
     :key_newline,
     # 142 M-^N
-    :ed_unassigned,
+    nil,
     # 143 M-^O
-    :ed_unassigned,
+    nil,
     # 144 M-^P
-    :ed_unassigned,
+    nil,
     # 145 M-^Q
-    :ed_unassigned,
+    nil,
     # 146 M-^R
-    :ed_unassigned,
+    nil,
     # 147 M-^S
-    :ed_unassigned,
+    nil,
     # 148 M-^T
-    :ed_unassigned,
+    nil,
     # 149 M-^U
-    :ed_unassigned,
+    nil,
     # 150 M-^V
-    :ed_unassigned,
+    nil,
     # 151 M-^W
-    :ed_unassigned,
+    nil,
     # 152 M-^X
-    :ed_unassigned,
+    nil,
     # 153 M-^Y
     :em_yank_pop,
     # 154 M-^Z
-    :ed_unassigned,
+    nil,
     # 155 M-^[
-    :ed_unassigned,
+    nil,
     # 156 M-^\
-    :ed_unassigned,
+    nil,
     # 157 M-^]
-    :ed_unassigned,
+    nil,
     # 158 M-^^
-    :ed_unassigned,
+    nil,
     # 159 M-^_
     :redo,
     # 160 M-SPACE
     :em_set_mark,
     # 161 M-!
-    :ed_unassigned,
+    nil,
     # 162 M-"
-    :ed_unassigned,
+    nil,
     # 163 M-#
-    :ed_unassigned,
+    nil,
     # 164 M-$
-    :ed_unassigned,
+    nil,
     # 165 M-%
-    :ed_unassigned,
+    nil,
     # 166 M-&
-    :ed_unassigned,
+    nil,
     # 167 M-'
-    :ed_unassigned,
+    nil,
     # 168 M-(
-    :ed_unassigned,
+    nil,
     # 169 M-)
-    :ed_unassigned,
+    nil,
     # 170 M-*
-    :ed_unassigned,
+    nil,
     # 171 M-+
-    :ed_unassigned,
+    nil,
     # 172 M-,
-    :ed_unassigned,
+    nil,
     # 173 M--
-    :ed_unassigned,
+    nil,
     # 174 M-.
-    :ed_unassigned,
+    nil,
     # 175 M-/
-    :ed_unassigned,
+    nil,
     # 176 M-0
     :ed_argument_digit,
     # 177 M-1
@@ -373,21 +373,21 @@ module Reline::KeyActor
     # 185 M-9
     :ed_argument_digit,
     # 186 M-:
-    :ed_unassigned,
+    nil,
     # 187 M-;
-    :ed_unassigned,
+    nil,
     # 188 M-<
-    :ed_unassigned,
+    nil,
     # 189 M-=
-    :ed_unassigned,
+    nil,
     # 190 M->
-    :ed_unassigned,
+    nil,
     # 191 M-?
-    :ed_unassigned,
+    nil,
     # 192 M-@
-    :ed_unassigned,
+    nil,
     # 193 M-A
-    :ed_unassigned,
+    nil,
     # 194 M-B
     :ed_prev_word,
     # 195 M-C
@@ -395,63 +395,63 @@ module Reline::KeyActor
     # 196 M-D
     :em_delete_next_word,
     # 197 M-E
-    :ed_unassigned,
+    nil,
     # 198 M-F
     :em_next_word,
     # 199 M-G
-    :ed_unassigned,
+    nil,
     # 200 M-H
-    :ed_unassigned,
+    nil,
     # 201 M-I
-    :ed_unassigned,
+    nil,
     # 202 M-J
-    :ed_unassigned,
+    nil,
     # 203 M-K
-    :ed_unassigned,
+    nil,
     # 204 M-L
     :em_lower_case,
     # 205 M-M
-    :ed_unassigned,
+    nil,
     # 206 M-N
     :vi_search_next,
     # 207 M-O
-    :ed_unassigned,
+    nil,
     # 208 M-P
     :vi_search_prev,
     # 209 M-Q
-    :ed_unassigned,
+    nil,
     # 210 M-R
-    :ed_unassigned,
+    nil,
     # 211 M-S
-    :ed_unassigned,
+    nil,
     # 212 M-T
-    :ed_unassigned,
+    nil,
     # 213 M-U
     :em_upper_case,
     # 214 M-V
-    :ed_unassigned,
+    nil,
     # 215 M-W
-    :ed_unassigned,
+    nil,
     # 216 M-X
-    :ed_unassigned,
+    nil,
     # 217 M-Y
     :em_yank_pop,
     # 218 M-Z
-    :ed_unassigned,
+    nil,
     # 219 M-[
-    :ed_unassigned,
+    nil,
     # 220 M-\
-    :ed_unassigned,
+    nil,
     # 221 M-]
-    :ed_unassigned,
+    nil,
     # 222 M-^
-    :ed_unassigned,
+    nil,
     # 223 M-_
-    :ed_unassigned,
+    nil,
     # 224 M-`
-    :ed_unassigned,
+    nil,
     # 225 M-a
-    :ed_unassigned,
+    nil,
     # 226 M-b
     :ed_prev_word,
     # 227 M-c
@@ -459,57 +459,57 @@ module Reline::KeyActor
     # 228 M-d
     :em_delete_next_word,
     # 229 M-e
-    :ed_unassigned,
+    nil,
     # 230 M-f
     :em_next_word,
     # 231 M-g
-    :ed_unassigned,
+    nil,
     # 232 M-h
-    :ed_unassigned,
+    nil,
     # 233 M-i
-    :ed_unassigned,
+    nil,
     # 234 M-j
-    :ed_unassigned,
+    nil,
     # 235 M-k
-    :ed_unassigned,
+    nil,
     # 236 M-l
     :em_lower_case,
     # 237 M-m
-    :ed_unassigned,
+    nil,
     # 238 M-n
     :vi_search_next,
     # 239 M-o
-    :ed_unassigned,
+    nil,
     # 240 M-p
     :vi_search_prev,
     # 241 M-q
-    :ed_unassigned,
+    nil,
     # 242 M-r
-    :ed_unassigned,
+    nil,
     # 243 M-s
-    :ed_unassigned,
+    nil,
     # 244 M-t
     :ed_transpose_words,
     # 245 M-u
     :em_upper_case,
     # 246 M-v
-    :ed_unassigned,
+    nil,
     # 247 M-w
-    :ed_unassigned,
+    nil,
     # 248 M-x
-    :ed_unassigned,
+    nil,
     # 249 M-y
-    :ed_unassigned,
+    nil,
     # 250 M-z
-    :ed_unassigned,
+    nil,
     # 251 M-{
-    :ed_unassigned,
+    nil,
     # 252 M-|
-    :ed_unassigned,
+    nil,
     # 253 M-}
-    :ed_unassigned,
+    nil,
     # 254 M-~
-    :ed_unassigned,
+    nil,
     # 255 M-^?
     :ed_delete_prev_word
     # EOF
diff --git a/lib/reline/key_actor/vi_command.rb b/lib/reline/key_actor/vi_command.rb
index d972c5e67f..400f88477a 100644
--- a/lib/reline/key_actor/vi_command.rb
+++ b/lib/reline/key_actor/vi_command.rb
@@ -1,11 +1,11 @@
 module Reline::KeyActor
   VI_COMMAND_MAPPING = [
     #   0 ^@
-    :ed_unassigned,
+    nil,
     #   1 ^A
     :ed_move_to_beg,
     #   2 ^B
-    :ed_unassigned,
+    nil,
     #   3 ^C
     :ed_ignore,
     #   4 ^D
@@ -13,13 +13,13 @@ module Reline::KeyActor
     #   5 ^E
     :ed_move_to_end,
     #   6 ^F
-    :ed_unassigned,
+    nil,
     #   7 ^G
-    :ed_unassigned,
+    nil,
     #   8 ^H
     :ed_prev_char,
     #   9 ^I
-    :ed_unassigned,
+    nil,
     #  10 ^J
     :ed_newline,
     #  11 ^K
@@ -49,51 +49,51 @@ module Reline::KeyActor
     #  23 ^W
     :ed_delete_prev_word,
     #  24 ^X
-    :ed_unassigned,
+    nil,
     #  25 ^Y
     :em_yank,
     #  26 ^Z
-    :ed_unassigned,
+    nil,
     #  27 ^[
-    :ed_unassigned,
+    nil,
     #  28 ^\
     :ed_ignore,
     #  29 ^]
-    :ed_unassigned,
+    nil,
     #  30 ^^
-    :ed_unassigned,
+    nil,
     #  31 ^_
-    :ed_unassigned,
+    nil,
     #  32 SPACE
     :ed_next_char,
     #  33 !
-    :ed_unassigned,
+    nil,
     #  34 "
-    :ed_unassigned,
+    nil,
     #  35 #
     :vi_comment_out,
     #  36 $
     :ed_move_to_end,
     #  37 %
-    :ed_unassigned,
+    nil,
     #  38 &
-    :ed_unassigned,
+    nil,
     #  39 '
-    :ed_unassigned,
+    nil,
     #  40 (
-    :ed_unassigned,
+    nil,
     #  41 )
-    :ed_unassigned,
+    nil,
     #  42 *
-    :ed_unassigned,
+    nil,
     #  43 +
     :ed_next_history,
     #  44 ,
-    :ed_unassigned,
+    nil,
     #  45 -
     :ed_prev_history,
     #  46 .
-    :ed_unassigned,
+    nil,
     #  47 /
     :vi_search_prev,
     #  48 0
@@ -117,15 +117,15 @@ module Reline::KeyActor
     #  57 9
     :ed_argument_digit,
     #  58 :
-    :ed_unassigned,
+    nil,
     #  59 ;
-    :ed_unassigned,
+    nil,
     #  60 <
-    :ed_unassigned,
+    nil,
     #  61 =
-    :ed_unassigned,
+    nil,
     #  62 >
-    :ed_unassigned,
+    nil,
     #  63 ?
     :vi_search_next,
     #  64 @
@@ -145,7 +145,7 @@ module Reline::KeyActor
     #  71 G
     :vi_to_history_line,
     #  72 H
-    :ed_unassigned,
+    nil,
     #  73 I
     :vi_insert_at_bol,
     #  74 J
@@ -153,47 +153,47 @@ module Reline::KeyActor
     #  75 K
     :vi_search_prev,
     #  76 L
-    :ed_unassigned,
+    nil,
     #  77 M
-    :ed_unassigned,
+    nil,
     #  78 N
-    :ed_unassigned,
+    nil,
     #  79 O
-    :ed_unassigned,
+    nil,
     #  80 P
     :vi_paste_prev,
     #  81 Q
-    :ed_unassigned,
+    nil,
     #  82 R
-    :ed_unassigned,
+    nil,
     #  83 S
-    :ed_unassigned,
+    nil,
     #  84 T
     :vi_to_prev_char,
     #  85 U
-    :ed_unassigned,
+    nil,
     #  86 V
-    :ed_unassigned,
+    nil,
     #  87 W
     :vi_next_big_word,
     #  88 X
     :ed_delete_prev_char,
     #  89 Y
-    :ed_unassigned,
+    nil,
     #  90 Z
-    :ed_unassigned,
+    nil,
     #  91 [
-    :ed_unassigned,
+    nil,
     #  92 \
-    :ed_unassigned,
+    nil,
     #  93 ]
-    :ed_unassigned,
+    nil,
     #  94 ^
     :vi_first_print,
     #  95 _
-    :ed_unassigned,
+    nil,
     #  96 `
-    :ed_unassigned,
+    nil,
     #  97 a
     :vi_add,
     #  98 b
@@ -207,7 +207,7 @@ module Reline::KeyActor
     # 102 f
     :vi_next_char,
     # 103 g
-    :ed_unassigned,
+    nil,
     # 104 h
     :ed_prev_char,
     # 105 i
@@ -219,23 +219,23 @@ module Reline::KeyActor
     # 108 l
     :ed_next_char,
     # 109 m
-    :ed_unassigned,
+    nil,
     # 110 n
-    :ed_unassigned,
+    nil,
     # 111 o
-    :ed_unassigned,
+    nil,
     # 112 p
     :vi_paste_next,
     # 113 q
-    :ed_unassigned,
+    nil,
     # 114 r
     :vi_replace_char,
     # 115 s
-    :ed_unassigned,
+    nil,
     # 116 t
     :vi_to_next_char,
     # 117 u
-    :ed_unassigned,
+    nil,
     # 118 v
     :vi_histedit,
     # 119 w
@@ -245,273 +245,273 @@ module Reline::KeyActor
     # 121 y
     :vi_yank,
     # 122 z
-    :ed_unassigned,
+    nil,
     # 123 {
-    :ed_unassigned,
+    nil,
     # 124 |
     :vi_to_column,
     # 125 }
-    :ed_unassigned,
+    nil,
     # 126 ~
-    :ed_unassigned,
+    nil,
     # 127 ^?
     :em_delete_prev_char,
     # 128 M-^@
-    :ed_unassigned,
+    nil,
     # 129 M-^A
-    :ed_unassigned,
+    nil,
     # 130 M-^B
-    :ed_unassigned,
+    nil,
     # 131 M-^C
-    :ed_unassigned,
+    nil,
     # 132 M-^D
-    :ed_unassigned,
+    nil,
     # 133 M-^E
-    :ed_unassigned,
+    nil,
     # 134 M-^F
-    :ed_unassigned,
+    nil,
     # 135 M-^G
-    :ed_unassigned,
+    nil,
     # 136 M-^H
-    :ed_unassigned,
+    nil,
     # 137 M-^I
-    :ed_unassigned,
+    nil,
     # 138 M-^J
-    :ed_unassigned,
+    nil,
     # 139 M-^K
-    :ed_unassigned,
+    nil,
     # 140 M-^L
-    :ed_unassigned,
+    nil,
     # 141 M-^M
-    :ed_unassigned,
+    nil,
     # 142 M-^N
-    :ed_unassigned,
+    nil,
     # 143 M-^O
-    :ed_unassigned,
+    nil,
     # 144 M-^P
-    :ed_unassigned,
+    nil,
     # 145 M-^Q
-    :ed_unassigned,
+    nil,
     # 146 M-^R
-    :ed_unassigned,
+    nil,
     # 147 M-^S
-    :ed_unassigned,
+    nil,
     # 148 M-^T
-    :ed_unassigned,
+    nil,
     # 149 M-^U
-    :ed_unassigned,
+    nil,
     # 150 M-^V
-    :ed_unassigned,
+    nil,
     # 151 M-^W
-    :ed_unassigned,
+    nil,
     # 152 M-^X
-    :ed_unassigned,
+    nil,
     # 153 M-^Y
-    :ed_unassigned,
+    nil,
     # 154 M-^Z
-    :ed_unassigned,
+    nil,
     # 155 M-^[
-    :ed_unassigned,
+    nil,
     # 156 M-^\
-    :ed_unassigned,
+    nil,
     # 157 M-^]
-    :ed_unassigned,
+    nil,
     # 158 M-^^
-    :ed_unassigned,
+    nil,
     # 159 M-^_
-    :ed_unassigned,
+    nil,
     # 160 M-SPACE
-    :ed_unassigned,
+    nil,
     # 161 M-!
-    :ed_unassigned,
+    nil,
     # 162 M-"
-    :ed_unassigned,
+    nil,
     # 163 M-#
-    :ed_unassigned,
+    nil,
     # 164 M-$
-    :ed_unassigned,
+    nil,
     # 165 M-%
-    :ed_unassigned,
+    nil,
     # 166 M-&
-    :ed_unassigned,
+    nil,
     # 167 M-'
-    :ed_unassigned,
+    nil,
     # 168 M-(
-    :ed_unassigned,
+    nil,
     # 169 M-)
-    :ed_unassigned,
+    nil,
     # 170 M-*
-    :ed_unassigned,
+    nil,
     # 171 M-+
-    :ed_unassigned,
+    nil,
     # 172 M-,
-    :ed_unassigned,
+    nil,
     # 173 M--
-    :ed_unassigned,
+    nil,
     # 174 M-.
-    :ed_unassigned,
+    nil,
     # 175 M-/
-    :ed_unassigned,
+    nil,
     # 176 M-0
-    :ed_unassigned,
+    nil,
     # 177 M-1
-    :ed_unassigned,
+    nil,
     # 178 M-2
-    :ed_unassigned,
+    nil,
     # 179 M-3
-    :ed_unassigned,
+    nil,
     # 180 M-4
-    :ed_unassigned,
+    nil,
     # 181 M-5
-    :ed_unassigned,
+    nil,
     # 182 M-6
-    :ed_unassigned,
+    nil,
     # 183 M-7
-    :ed_unassigned,
+    nil,
     # 184 M-8
-    :ed_unassigned,
+    nil,
     # 185 M-9
-    :ed_unassigned,
+    nil,
     # 186 M-:
-    :ed_unassigned,
+    nil,
     # 187 M-;
-    :ed_unassigned,
+    nil,
     # 188 M-<
-    :ed_unassigned,
+    nil,
     # 189 M-=
-    :ed_unassigned,
+    nil,
     # 190 M->
-    :ed_unassigned,
+    nil,
     # 191 M-?
-    :ed_unassigned,
+    nil,
     # 192 M-@
-    :ed_unassigned,
+    nil,
     # 193 M-A
-    :ed_unassigned,
+    nil,
     # 194 M-B
-    :ed_unassigned,
+    nil,
     # 195 M-C
-    :ed_unassigned,
+    nil,
     # 196 M-D
-    :ed_unassigned,
+    nil,
     # 197 M-E
-    :ed_unassigned,
+    nil,
     # 198 M-F
-    :ed_unassigned,
+    nil,
     # 199 M-G
-    :ed_unassigned,
+    nil,
     # 200 M-H
-    :ed_unassigned,
+    nil,
     # 201 M-I
-    :ed_unassigned,
+    nil,
     # 202 M-J
-    :ed_unassigned,
+    nil,
     # 203 M-K
-    :ed_unassigned,
+    nil,
     # 204 M-L
-    :ed_unassigned,
+    nil,
     # 205 M-M
-    :ed_unassigned,
+    nil,
     # 206 M-N
-    :ed_unassigned,
+    nil,
     # 207 M-O
-    :ed_unassigned,
+    nil,
     # 208 M-P
-    :ed_unassigned,
+    nil,
     # 209 M-Q
-    :ed_unassigned,
+    nil,
     # 210 M-R
-    :ed_unassigned,
+    nil,
     # 211 M-S
-    :ed_unassigned,
+    nil,
     # 212 M-T
-    :ed_unassigned,
+    nil,
     # 213 M-U
-    :ed_unassigned,
+    nil,
     # 214 M-V
-    :ed_unassigned,
+    nil,
     # 215 M-W
-    :ed_unassigned,
+    nil,
     # 216 M-X
-    :ed_unassigned,
+    nil,
     # 217 M-Y
-    :ed_unassigned,
+    nil,
     # 218 M-Z
-    :ed_unassigned,
+    nil,
     # 219 M-[
-    :ed_unassigned,
+    nil,
     # 220 M-\
-    :ed_unassigned,
+    nil,
     # 221 M-]
-    :ed_unassigned,
+    nil,
     # 222 M-^
-    :ed_unassigned,
+    nil,
     # 223 M-_
-    :ed_unassigned,
+    nil,
     # 224 M-`
-    :ed_unassigned,
+    nil,
     # 225 M-a
-    :ed_unassigned,
+    nil,
     # 226 M-b
-    :ed_unassigned,
+    nil,
     # 227 M-c
-    :ed_unassigned,
+    nil,
     # 228 M-d
-    :ed_unassigned,
+    nil,
     # 229 M-e
-    :ed_unassigned,
+    nil,
     # 230 M-f
-    :ed_unassigned,
+    nil,
     # 231 M-g
-    :ed_unassigned,
+    nil,
     # 232 M-h
-    :ed_unassigned,
+    nil,
     # 233 M-i
-    :ed_unassigned,
+    nil,
     # 234 M-j
-    :ed_unassigned,
+    nil,
     # 235 M-k
-    :ed_unassigned,
+    nil,
     # 236 M-l
-    :ed_unassigned,
+    nil,
     # 237 M-m
-    :ed_unassigned,
+    nil,
     # 238 M-n
-    :ed_unassigned,
+    nil,
     # 239 M-o
-    :ed_unassigned,
+    nil,
     # 240 M-p
-    :ed_unassigned,
+    nil,
     # 241 M-q
-    :ed_unassigned,
+    nil,
     # 242 M-r
-    :ed_unassigned,
+    nil,
     # 243 M-s
-    :ed_unassigned,
+    nil,
     # 244 M-t
-    :ed_unassigned,
+    nil,
     # 245 M-u
-    :ed_unassigned,
+    nil,
     # 246 M-v
-    :ed_unassigned,
+    nil,
     # 247 M-w
-    :ed_unassigned,
+    nil,
     # 248 M-x
-    :ed_unassigned,
+    nil,
     # 249 M-y
-    :ed_unassigned,
+    nil,
     # 250 M-z
-    :ed_unassigned,
+    nil,
     # 251 M-{
-    :ed_unassigned,
+    nil,
     # 252 M-|
-    :ed_unassigned,
+    nil,
     # 253 M-}
-    :ed_unassigned,
+    nil,
     # 254 M-~
-    :ed_unassigned,
+    nil,
     # 255 M-^?
-    :ed_unassigned
+    nil
     # EOF
   ]
 end
diff --git a/lib/reline/key_actor/vi_insert.rb b/lib/reline/key_actor/vi_insert.rb
index 312df1646b..9a0ff57253 100644
--- a/lib/reline/key_actor/vi_insert.rb
+++ b/lib/reline/key_actor/vi_insert.rb
@@ -1,7 +1,7 @@
 module Reline::KeyActor
   VI_INSERT_MAPPING = [
     #   0 ^@
-    :ed_unassigned,
+    nil,
     #   1 ^A
     :ed_insert,
     #   2 ^B
@@ -257,261 +257,261 @@ module Reline::KeyActor
     # 127 ^?
     :vi_delete_prev_char,
     # 128 M-^@
-    :ed_unassigned,
+    nil,
     # 129 M-^A
-    :ed_unassigned,
+    nil,
     # 130 M-^B
-    :ed_unassigned,
+    nil,
     # 131 M-^C
-    :ed_unassigned,
+    nil,
     # 132 M-^D
-    :ed_unassigned,
+    nil,
     # 133 M-^E
-    :ed_unassigned,
+    nil,
     # 134 M-^F
-    :ed_unassigned,
+    nil,
     # 135 M-^G
-    :ed_unassigned,
+    nil,
     # 136 M-^H
-    :ed_unassigned,
+    nil,
     # 137 M-^I
-    :ed_unassigned,
+    nil,
     # 138 M-^J
     :key_newline,
     # 139 M-^K
-    :ed_unassigned,
+    nil,
     # 140 M-^L
-    :ed_unassigned,
+    nil,
     # 141 M-^M
     :key_newline,
     # 142 M-^N
-    :ed_unassigned,
+    nil,
     # 143 M-^O
-    :ed_unassigned,
+    nil,
     # 144 M-^P
-    :ed_unassigned,
+    nil,
     # 145 M-^Q
-    :ed_unassigned,
+    nil,
     # 146 M-^R
-    :ed_unassigned,
+    nil,
     # 147 M-^S
-    :ed_unassigned,
+    nil,
     # 148 M-^T
-    :ed_unassigned,
+    nil,
     # 149 M-^U
-    :ed_unassigned,
+    nil,
     # 150 M-^V
-    :ed_unassigned,
+    nil,
     # 151 M-^W
-    :ed_unassigned,
+    nil,
     # 152 M-^X
-    :ed_unassigned,
+    nil,
     # 153 M-^Y
-    :ed_unassigned,
+    nil,
     # 154 M-^Z
-    :ed_unassigned,
+    nil,
     # 155 M-^[
-    :ed_unassigned,
+    nil,
     # 156 M-^\
-    :ed_unassigned,
+    nil,
     # 157 M-^]
-    :ed_unassigned,
+    nil,
     # 158 M-^^
-    :ed_unassigned,
+    nil,
     # 159 M-^_
-    :ed_unassigned,
+    nil,
     # 160 M-SPACE
-    :ed_unassigned,
+    nil,
     # 161 M-!
-    :ed_unassigned,
+    nil,
     # 162 M-"
-    :ed_unassigned,
+    nil,
     # 163 M-#
-    :ed_unassigned,
+    nil,
     # 164 M-$
-    :ed_unassigned,
+    nil,
     # 165 M-%
-    :ed_unassigned,
+    nil,
     # 166 M-&
-    :ed_unassigned,
+    nil,
     # 167 M-'
-    :ed_unassigned,
+    nil,
     # 168 M-(
-    :ed_unassigned,
+    nil,
     # 169 M-)
-    :ed_unassigned,
+    nil,
     # 170 M-*
-    :ed_unassigned,
+    nil,
     # 171 M-+
-    :ed_unassigned,
+    nil,
     # 172 M-,
-    :ed_unassigned,
+    nil,
     # 173 M--
-    :ed_unassigned,
+    nil,
     # 174 M-.
-    :ed_unassigned,
+    nil,
     # 175 M-/
-    :ed_unassigned,
+    nil,
     # 176 M-0
-    :ed_unassigned,
+    nil,
     # 177 M-1
-    :ed_unassigned,
+    nil,
     # 178 M-2
-    :ed_unassigned,
+    nil,
     # 179 M-3
-    :ed_unassigned,
+    nil,
     # 180 M-4
-    :ed_unassigned,
+    nil,
     # 181 M-5
-    :ed_unassigned,
+    nil,
     # 182 M-6
-    :ed_unassigned,
+    nil,
     # 183 M-7
-    :ed_unassigned,
+    nil,
     # 184 M-8
-    :ed_unassigned,
+    nil,
     # 185 M-9
-    :ed_unassigned,
+    nil,
     # 186 M-:
-    :ed_unassigned,
+    nil,
     # 187 M-;
-    :ed_unassigned,
+    nil,
     # 188 M-<
-    :ed_unassigned,
+    nil,
     # 189 M-=
-    :ed_unassigned,
+    nil,
     # 190 M->
-    :ed_unassigned,
+    nil,
     # 191 M-?
-    :ed_unassigned,
+    nil,
     # 192 M-@
-    :ed_unassigned,
+    nil,
     # 193 M-A
-    :ed_unassigned,
+    nil,
     # 194 M-B
-    :ed_unassigned,
+    nil,
     # 195 M-C
-    :ed_unassigned,
+    nil,
     # 196 M-D
-    :ed_unassigned,
+    nil,
     # 197 M-E
-    :ed_unassigned,
+    nil,
     # 198 M-F
-    :ed_unassigned,
+    nil,
     # 199 M-G
-    :ed_unassigned,
+    nil,
     # 200 M-H
-    :ed_unassigned,
+    nil,
     # 201 M-I
-    :ed_unassigned,
+    nil,
     # 202 M-J
-    :ed_unassigned,
+    nil,
     # 203 M-K
-    :ed_unassigned,
+    nil,
     # 204 M-L
-    :ed_unassigned,
+    nil,
     # 205 M-M
-    :ed_unassigned,
+    nil,
     # 206 M-N
-    :ed_unassigned,
+    nil,
     # 207 M-O
-    :ed_unassigned,
+    nil,
     # 208 M-P
-    :ed_unassigned,
+    nil,
     # 209 M-Q
-    :ed_unassigned,
+    nil,
     # 210 M-R
-    :ed_unassigned,
+    nil,
     # 211 M-S
-    :ed_unassigned,
+    nil,
     # 212 M-T
-    :ed_unassigned,
+    nil,
     # 213 M-U
-    :ed_unassigned,
+    nil,
     # 214 M-V
-    :ed_unassigned,
+    nil,
     # 215 M-W
-    :ed_unassigned,
+    nil,
     # 216 M-X
-    :ed_unassigned,
+    nil,
     # 217 M-Y
-    :ed_unassigned,
+    nil,
     # 218 M-Z
-    :ed_unassigned,
+    nil,
     # 219 M-[
-    :ed_unassigned,
+    nil,
     # 220 M-\
-    :ed_unassigned,
+    nil,
     # 221 M-]
-    :ed_unassigned,
+    nil,
     # 222 M-^
-    :ed_unassigned,
+    nil,
     # 223 M-_
-    :ed_unassigned,
+    nil,
     # 224 M-`
-    :ed_unassigned,
+    nil,
     # 225 M-a
-    :ed_unassigned,
+    nil,
     # 226 M-b
-    :ed_unassigned,
+    nil,
     # 227 M-c
-    :ed_unassigned,
+    nil,
     # 228 M-d
-    :ed_unassigned,
+    nil,
     # 229 M-e
-    :ed_unassigned,
+    nil,
     # 230 M-f
-    :ed_unassigned,
+    nil,
     # 231 M-g
-    :ed_unassigned,
+    nil,
     # 232 M-h
-    :ed_unassigned,
+    nil,
     # 233 M-i
-    :ed_unassigned,
+    nil,
     # 234 M-j
-    :ed_unassigned,
+    nil,
     # 235 M-k
-    :ed_unassigned,
+    nil,
     # 236 M-l
-    :ed_unassigned,
+    nil,
     # 237 M-m
-    :ed_unassigned,
+    nil,
     # 238 M-n
-    :ed_unassigned,
+    nil,
     # 239 M-o
-    :ed_unassigned,
+    nil,
     # 240 M-p
-    :ed_unassigned,
+    nil,
     # 241 M-q
-    :ed_unassigned,
+    nil,
     # 242 M-r
-    :ed_unassigned,
+    nil,
     # 243 M-s
-    :ed_unassigned,
+    nil,
     # 244 M-t
-    :ed_unassigned,
+    nil,
     # 245 M-u
-    :ed_unassigned,
+    nil,
     # 246 M-v
-    :ed_unassigned,
+    nil,
     # 247 M-w
-    :ed_unassigned,
+    nil,
     # 248 M-x
-    :ed_unassigned,
+    nil,
     # 249 M-y
-    :ed_unassigned,
+    nil,
     # 250 M-z
-    :ed_unassigned,
+    nil,
     # 251 M-{
-    :ed_unassigned,
+    nil,
     # 252 M-|
-    :ed_unassigned,
+    nil,
     # 253 M-}
-    :ed_unassigned,
+    nil,
     # 254 M-~
-    :ed_unassigned,
+    nil,
     # 255 M-^?
-    :ed_unassigned
+    nil
     # EOF
   ]
 end
diff --git a/lib/reline/key_stroke.rb b/lib/reline/key_stroke.rb
index 4e7ecd20f8..c3cee3d241 100644
--- a/lib/reline/key_stroke.rb
+++ b/lib/reline/key_stroke.rb
@@ -22,11 +22,6 @@ class Reline::KeyStroke
   def match_status(input)
     matching = key_mapping.matching?(input)
     matched = key_mapping.get(input)
-
-    # FIXME: Workaround for single byte. remove this after MAPPING is merged into KeyActor.
-    matched ||= input.size == 1 && input[0] < 0x80
-    matching ||= input == [ESC_BYTE]
-
     if matching && matched
       MATCHING_MATCHED
     elsif matching
@@ -57,16 +52,20 @@ class Reline::KeyStroke
     return [[], []] unless matched_bytes
 
     func = key_mapping.get(matched_bytes)
+    s = matched_bytes.pack('c*').force_encoding(@encoding)
     if func.is_a?(Array)
-      keys = func.map { |c| Reline::Key.new(c, c, false) }
+      # Perform simple macro expansion for single byte key bindings.
+      # Multibyte key bindings and recursive macro expansion are not supported yet.
+      marco = func.pack('c*').force_encoding(@encoding)
+      keys = marco.chars.map do |c|
+        f = key_mapping.get(c.bytes)
+        Reline::Key.new(c, f.is_a?(Symbol) ? f : :ed_insert, false)
+      end
     elsif func
-      keys = [Reline::Key.new(func, func, false)]
-    elsif matched_bytes.size == 2 && matched_bytes[0] == ESC_BYTE
-      keys = [Reline::Key.new(matched_bytes[1], matched_bytes[1] | 0b10000000, true)]
+      keys = [Reline::Key.new(s, func, false)]
     else
-      s = matched_bytes.pack('c*').force_encoding(@encoding)
       if s.valid_encoding? && s.size == 1
-        keys = [Reline::Key.new(s.ord, s.ord, false)]
+        keys = [Reline::Key.new(s, :ed_insert, false)]
       else
         keys = []
       end
diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index c5658137ee..0ba44f8bc6 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -973,10 +973,17 @@ class Reline::LineEditor
     @drop_terminate_spaces = false
   end
 
+  VI_WAITING_ACCEPT_METHODS = %i[vi_change_meta vi_delete_meta vi_yank ed_insert ed_argument_digit]
+
   private def process_key(key, method_symbol)
-    if key.is_a?(Symbol)
-      cleanup_waiting
-    elsif @waiting_proc
+    if @waiting_proc
+      cleanup_waiting unless key.size == 1
+    end
+    if @vi_waiting_operator
+      cleanup_waiting unless VI_WAITING_ACCEPT_METHODS.include?(method_symbol) || VI_MOTIONS.include?(method_symbol)
+    end
+
+    if @waiting_proc
       old_byte_pointer = @byte_pointer
       @waiting_proc.call(key)
       if @vi_waiting_operator
@@ -990,23 +997,14 @@ class Reline::LineEditor
       return
     end
 
+    # Reject multibyte input (converted to ed_insert) in vi_command mode
+    return if method_symbol == :ed_insert && @config.editing_mode_is?(:vi_command)
+
     if method_symbol and respond_to?(method_symbol, true)
       method_obj = method(method_symbol)
     end
-    if method_symbol and key.is_a?(Symbol)
-      if @vi_arg and argumentable?(method_obj)
-        run_for_operators(key, method_symbol) do |with_operator|
-          wrap_method_call(method_symbol, method_obj, key, with_operator)
-        end
-      else
-        wrap_method_call(method_symbol, method_obj, key) if method_obj
-      end
-      @kill_ring.process
-      if @vi_arg
-        @vi_arg = nil
-      end
-    elsif @vi_arg
-      if key.chr =~ /[0-9]/
+    if @vi_arg
+      if key.match?(/\A\d\z/)
         ed_argument_digit(key)
       else
         if argumentable?(method_obj)
@@ -1015,8 +1013,6 @@ class Reline::LineEditor
           end
         elsif method_obj
           wrap_method_call(method_symbol, method_obj, key)
-        else
-          ed_insert(key) unless @config.editing_mode_is?(:vi_command)
         end
         @kill_ring.process
         if @vi_arg
@@ -1032,21 +1028,6 @@ class Reline::LineEditor
         end
       end
       @kill_ring.process
-    else
-      ed_insert(key) unless @config.editing_mode_is?(:vi_command)
-    end
-  end
-
-  private def normal_char(key)
-    if key.char < 0x80
-      method_symbol = @config.editing_mode.get_method(key.combined_char)
-      process_key(key.combined_char, method_symbol)
-    else
-      process_key(key.char.chr(encoding), nil)
-    end
-    if @config.editing_mode_is?(:vi_command) and @byte_pointer > 0 and @byte_pointer == current_line.bytesize
-      byte_size = Reline::Unicode.get_prev_mbchar_size(@buffer_of_lines[@line_index], @byte_pointer)
-      @byte_pointer -= byte_size
     end
   end
 
@@ -1063,23 +1044,23 @@ class Reline::LineEditor
   def input_key(key)
     save_old_buffer
     @config.reset_oneshot_key_bindings
-    @dialogs.each do |dialog|
-      if key.char.instance_of?(Symbol) and key.char == dialog.name
-        return
-      end
-    end
     if key.char.nil?
       process_insert(force: true)
       @eof = buffer_empty?
       finish
       return
     end
+    @dialogs.each do |dialog|
+      if key.method_symbol == dialog.name
+        return
+      end
+    end
     @completion_occurs = false
 
-    if key.char.is_a?(Symbol)
-      process_key(key.char, key.char)
-    else
-      normal_char(key)
+    process_key(key.char, key.method_symbol)
+    if @config.editing_mode_is?(:vi_command) and @byte_pointer > 0 and @byte_pointer == current_line.bytesize
+      byte_size = Reline::Unicode.get_prev_mbchar_size(@buffer_of_lines[@line_index], @byte_pointer)
+      @byte_pointer -= byte_size
     end
 
     @prev_action_state, @next_action_state = @next_action_state, NullActionState
@@ -1432,21 +1413,11 @@ class Reline::LineEditor
   #            digit or if the existing argument is already greater than a
   #            million.
   # GNU Readline:: +self-insert+ (a, b, A, 1, !, …) Insert yourself.
-  private def ed_insert(key)
-    if key.instance_of?(String)
-      begin
-        key.encode(Encoding::UTF_8)
-      rescue Encoding::UndefinedConversionError
-        return
-      end
-      str = key
-    else
-      begin
-        key.chr.encode(Encoding::UTF_8)
-      rescue Encoding::UndefinedConversionError
-        return
-      end
-      str = key.chr
+  private def ed_insert(str)
+    begin
+      str.encode(Encoding::UTF_8)
+    rescue Encoding::UndefinedConversionError
+      return
     end
     if @in_pasting
       @continuous_insertion_buffer << str
@@ -1463,11 +1434,10 @@ class Reline::LineEditor
   private def ed_quoted_insert(str, arg: 1)
     @waiting_proc = proc { |key|
       arg.times do
-        if key == "\C-j".ord or key == "\C-m".ord
+        if key == "\C-j" or key == "\C-m"
           key_newline(key)
-        elsif key == 0
+        elsif key != "\0"
           # Ignore NUL.
-        else
           ed_insert(key)
         end
       end
@@ -1523,13 +1493,13 @@ class Reline::LineEditor
     lambda do |key|
       search_again = false
       case key
-      when "\C-h".ord, "\C-?".ord
+      when "\C-h", "\C-?"
         grapheme_clusters = search_word.grapheme_clusters
         if grapheme_clusters.size > 0
           grapheme_clusters.pop
           search_word = grapheme_clusters.join
         end
-      when "\C-r".ord, "\C-s".ord
+      when "\C-r", "\C-s"
         search_again = true if search_key == key
         search_key = key
       else
@@ -1546,10 +1516,10 @@ class Reline::LineEditor
           end
           if @history_pointer
             case search_key
-            when "\C-r".ord
+            when "\C-r"
               history_pointer_base = 0
               history = Reline::HISTORY[0..(@history_pointer - 1)]
-            when "\C-s".ord
+            when "\C-s"
               history_pointer_base = @history_pointer + 1
               history = Reline::HISTORY[(@history_pointer + 1)..-1]
             end
@@ -1559,10 +1529,10 @@ class Reline::LineEditor
           end
         elsif @history_pointer
           case search_key
-          when "\C-r".ord
+          when "\C-r"
             history_pointer_base = 0
             history = Reline::HISTORY[0..@history_pointer]
-          when "\C-s".ord
+          when "\C-s"
             history_pointer_base = @history_pointer
             history = Reline::HISTORY[@history_pointer..-1]
           end
@@ -1571,11 +1541,11 @@ class Reline::LineEditor
           history = Reline::HISTORY
         end
         case search_key
-        when "\C-r".ord
+        when "\C-r"
           hit_index = history.rindex { |item|
             item.include?(search_word)
           }
-        when "\C-s".ord
+        when "\C-s"
           hit_index = history.index { |item|
             item.include?(search_word)
           }
@@ -1586,9 +1556,9 @@ class Reline::LineEditor
         end
       end
       case search_key
-      when "\C-r".ord
+      when "\C-r"
         prompt_name = 'reverse-i-search'
-      when "\C-s".ord
+      when "\C-s"
         prompt_name = 'i-search'
       end
       prompt_name = "failed #{prompt_name}" unless hit
@@ -1600,16 +1570,15 @@ class Reline::LineEditor
     backup = @buffer_of_lines.dup, @line_index, @byte_pointer, @history_pointer, @line_backup_in_history
     searcher = generate_searcher(key)
     @searching_prompt = "(reverse-i-search)`': "
-    termination_keys = ["\C-j".ord]
-    termination_keys.concat(@config.isearch_terminators.chars.map(&:ord)) if @config.isearch_terminators
+    termination_keys = ["\C-j"]
+    termination_keys.concat(@config.isearch_terminators.chars) if @config.isearch_terminators
     @waiting_proc = ->(k) {
-      chr = k.is_a?(String) ? k : k.chr(Encoding::ASCII_8BIT)
-      if k == "\C-g".ord
+      if k == "\C-g"
         # cancel search and restore buffer
         @buffer_of_lines, @line_index, @byte_pointer, @history_pointer, @line_backup_in_history = backup
         @searching_prompt = nil
         @waiting_proc = nil
-      elsif !termination_keys.include?(k) && (chr.match?(/[[:print:]]/) || k == "\C-h".ord || k == "\C-?".ord || k == "\C-r".ord || k == "\C-s".ord)
+      elsif !termination_keys.include?(k) && (k.match?(/[[:print:]]/) || k == "\C-h" || k == "\C-?" || k == "\C-r" || k == "\C-s")
         search_word, prompt_name, hit_pointer = searcher.call(k)
         Reline.last_incremental_search = search_word
         @searching_prompt = "(%s)`%s'" % [prompt_name, search_word]
@@ -1825,7 +1794,7 @@ class Reline::LineEditor
   alias_method :kill_whole_line, :em_kill_line
 
   private def em_delete(key)
-    if buffer_empty? and key == "\C-d".ord
+    if buffer_empty? and key == "\C-d"
       @eof = true
       finish
     elsif @byte_pointer < current_line.bytesize
@@ -2243,20 +2212,9 @@ class Reline::LineEditor
   end
 
   private def ed_argument_digit(key)
-    if @vi_arg.nil?
-      if key.chr.to_i.zero?
-        if key.anybits?(0b10000000)
-          unescaped_key = key ^ 0b10000000
-          unless unescaped_key.chr.to_i.zero?
-            @vi_arg = unescaped_key.chr.to_i
-          end
-        end
-      else
-        @vi_arg = key.chr.to_i
-      end
-    else
-      @vi_arg = @vi_arg * 10 + key.chr.to_i
-    end
+    # key is expected to be `ESC digit` or `digit`
+    num = key[/\d/].to_i
+    @vi_arg = (@vi_arg || 0) * 10 + num
   end
 
   private def vi_to_column(key, arg: 0)
@@ -2275,7 +2233,7 @@ class Reline::LineEditor
         before = current_line.byteslice(0, @byte_pointer)
         remaining_point = @byte_pointer + byte_size
         after = current_line.byteslice(remaining_point, current_line.bytesize - remaining_point)
-        set_current_line(before + k.chr + after)
+        set_current_line(before + k + after)
         @waiting_proc = nil
       elsif arg > 1
         byte_size = 0
@@ -2285,7 +2243,7 @@ class Reline::LineEditor
         before = current_line.byteslice(0, @byte_pointer)
         remaining_point = @byte_pointer + byte_size
         after = current_line.byteslice(remaining_point, current_line.bytesize - remaining_point)
-        replaced = k.chr * arg
+        replaced = k * arg
         set_current_line(before + replaced + after, @byte_pointer + replaced.bytesize)
         @waiting_proc = nil
       end
@@ -2301,11 +2259,6 @@ class Reline::LineEditor
   end
 
   private def search_next_char(key, arg, need_prev_char: false, inclusive: false)
-    if key.instance_of?(String)
-      inputted_char = key
-    else
-      inputted_char = key.chr
-    end
     prev_total = nil
     total = nil
     found = false
@@ -2316,7 +2269,7 @@ class Reline::LineEditor
         width = Reline::Unicode.get_mbchar_width(mbchar)
         total = [mbchar.bytesize, width]
       else
-        if inputted_char == mbchar
+        if key == mbchar
           arg -= 1
           if arg.zero?
             found = true
@@ -2353,11 +2306,6 @@ class Reline::LineEditor
   end
 
   private def search_prev_char(key, arg, need_next_char = false)
-    if key.instance_of?(String)
-      inputted_char = key
-    else
-      inputted_char = key.chr
-    end
     prev_total = nil
     total = nil
     found = false
@@ -2368,7 +2316,7 @@ class Reline::LineEditor
         width = Reline::Unicode.get_mbchar_width(mbchar)
         total = [mbchar.bytesize, width]
       else
-        if inputted_char == mbchar
+        if key == mbchar
           arg -= 1
           if arg.zero?
             found = true