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class Reline::KeyStroke
ESC_BYTE = 27
CSI_PARAMETER_BYTES_RANGE = 0x30..0x3f
CSI_INTERMEDIATE_BYTES_RANGE = (0x20..0x2f)
attr_accessor :encoding
def initialize(config, encoding)
@config = config
@encoding = encoding
end
# Input exactly matches to a key sequence
MATCHING = :matching
# Input partially matches to a key sequence
MATCHED = :matched
# Input matches to a key sequence and the key sequence is a prefix of another key sequence
MATCHING_MATCHED = :matching_matched
# Input does not match to any key sequence
UNMATCHED = :unmatched
def match_status(input)
matching = key_mapping.matching?(input)
matched = key_mapping.get(input)
if matching && matched
MATCHING_MATCHED
elsif matching
MATCHING
elsif matched
MATCHED
elsif input[0] == ESC_BYTE
match_unknown_escape_sequence(input, vi_mode: @config.editing_mode_is?(:vi_insert, :vi_command))
else
s = input.pack('c*').force_encoding(@encoding)
if s.valid_encoding?
s.size == 1 ? MATCHED : UNMATCHED
else
# Invalid string is MATCHING (part of valid string) or MATCHED (invalid bytes to be ignored)
MATCHING_MATCHED
end
end
end
def expand(input)
matched_bytes = nil
(1..input.size).each do |i|
bytes = input.take(i)
status = match_status(bytes)
matched_bytes = bytes if status == MATCHED || status == MATCHING_MATCHED
break if status == MATCHED || status == UNMATCHED
end
return [[], []] unless matched_bytes
func = key_mapping.get(matched_bytes)
s = matched_bytes.pack('c*').force_encoding(@encoding)
if func.is_a?(Array)
# 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(s, func, false)]
else
if s.valid_encoding? && s.size == 1
keys = [Reline::Key.new(s, :ed_insert, false)]
else
keys = []
end
end
[keys, input.drop(matched_bytes.size)]
end
private
# returns match status of CSI/SS3 sequence and matched length
def match_unknown_escape_sequence(input, vi_mode: false)
idx = 0
return UNMATCHED unless input[idx] == ESC_BYTE
idx += 1
idx += 1 if input[idx] == ESC_BYTE
case input[idx]
when nil
if idx == 1 # `ESC`
return MATCHING_MATCHED
else # `ESC ESC`
return MATCHING
end
when 91 # == '['.ord
# CSI sequence `ESC [ ... char`
idx += 1
idx += 1 while idx < input.size && CSI_PARAMETER_BYTES_RANGE.cover?(input[idx])
idx += 1 while idx < input.size && CSI_INTERMEDIATE_BYTES_RANGE.cover?(input[idx])
when 79 # == 'O'.ord
# SS3 sequence `ESC O char`
idx += 1
else
# `ESC char` or `ESC ESC char`
return UNMATCHED if vi_mode
end
case input.size
when idx
MATCHING
when idx + 1
MATCHED
else
UNMATCHED
end
end
def key_mapping
@config.key_bindings
end
end