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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
@buffer = []
end
def input_to(bytes)
case match_status(bytes)
when :matching
nil
when :matched
expand(bytes)
when :unmatched
bytes
end
end
def input_to!(bytes)
if bytes.nil?
return @buffer.push(nil)&.tap { clear }
end
@buffer.concat Array(bytes)
input_to(@buffer)&.tap { clear }
end
private
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
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_mapping].transform_keys(&:bytes)
end
def clear
@buffer = []
end
end
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