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|
class Reline::KeyStroke
using Module.new {
refine Array do
def start_with?(other)
other.size <= size && other == self.take(other.size)
end
def bytes
self
end
end
}
def initialize(config)
@config = config
end
# Keystrokes of GNU Readline will timeout it with the specification of
# "keyseq-timeout" when waiting for the 2nd character after the 1st one.
# If the 2nd character comes after 1st ESC without timeout it has a
# meta-property of meta-key to discriminate modified key with meta-key
# from multibyte characters that come with 8th bit on.
#
# GNU Readline will wait for the 2nd character with "keyseq-timeout"
# milli-seconds but wait forever after 3rd characters.
def read_io(keyseq_timeout, &block)
buffer = []
loop do
c = Reline::IOGate.getc
buffer << c
result = match_status(buffer)
case result
when :matched
block.(expand(buffer).map{ |c| Reline::Key.new(c, c, false) })
break
when :matching
if buffer.size == 1
begin
succ_c = nil
Timeout.timeout(keyseq_timeout / 1000.0) {
succ_c = Reline::IOGate.getc
}
rescue Timeout::Error # cancel matching only when first byte
block.([Reline::Key.new(c, c, false)])
break
else
if match_status(buffer.dup.push(succ_c)) == :unmatched
if c == "\e".ord
block.([Reline::Key.new(succ_c, succ_c | 0b10000000, true)])
else
block.([Reline::Key.new(c, c, false), Reline::Key.new(succ_c, succ_c, false)])
end
break
else
Reline::IOGate.ungetc(succ_c)
end
end
end
when :unmatched
if buffer.size == 1 and c == "\e".ord
read_escaped_key(keyseq_timeout, buffer, block)
else
block.(buffer.map{ |c| Reline::Key.new(c, c, false) })
end
break
end
end
end
def read_escaped_key(keyseq_timeout, buffer, block)
begin
escaped_c = nil
Timeout.timeout(keyseq_timeout / 1000.0) {
escaped_c = Reline::IOGate.getc
}
rescue Timeout::Error # independent ESC
block.([Reline::Key.new(c, c, false)])
else
if escaped_c.nil?
block.([Reline::Key.new(c, c, false)])
elsif escaped_c >= 128 # maybe, first byte of multi byte
block.([Reline::Key.new(c, c, false), Reline::Key.new(escaped_c, escaped_c, false)])
elsif escaped_c == "\e".ord # escape twice
block.([Reline::Key.new(c, c, false), Reline::Key.new(c, c, false)])
else
block.([Reline::Key.new(escaped_c, escaped_c | 0b10000000, true)])
end
end
end
def match_status(input)
key_mapping.keys.select { |lhs|
lhs.start_with? input
}.tap { |it|
return :matched if it.size == 1 && (it.max_by(&:size)&.size&.== input.size)
return :matching if it.size == 1 && (it.max_by(&:size)&.size&.!= input.size)
return :matched if it.max_by(&:size)&.size&.< input.size
return :matching if it.size > 1
}
key_mapping.keys.select { |lhs|
input.start_with? lhs
}.tap { |it|
return it.size > 0 ? :matched : :unmatched
}
end
private
def expand(input)
lhs = key_mapping.keys.select { |lhs| input.start_with? lhs }.sort_by(&:size).reverse.first
return input unless lhs
rhs = key_mapping[lhs]
case rhs
when String
rhs_bytes = rhs.bytes
expand(expand(rhs_bytes) + expand(input.drop(lhs.size)))
when Symbol
[rhs] + expand(input.drop(lhs.size))
end
end
def key_mapping
@config.key_bindings
end
end
|
