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# Stores the result of matching an atom against input in the #captures in
# parse context. Doing so will allow you to pull parts of the ongoing parse
# out later and use them to match other pieces of input.
#
# Example:
# # After this, context.captures[:an_a] returns 'a'
# str('a').capture(:an_a)
#
# # Capture and use of the capture: (matches either 'aa' or 'bb')
# match['ab'].capture(:first) >>
# dynamic { |src, ctx| str(ctx.captures[:first]) }
#
class Parslet::Atoms::Capture < Parslet::Atoms::Base
attr_reader :parslet, :name
def initialize(parslet, name)
super()
@parslet, @name = parslet, name
end
def apply(source, context, consume_all)
success, value = result = parslet.apply(source, context, consume_all)
if success
context.captures[name.to_sym] =
flatten(value)
end
return result
end
def to_s_inner(prec)
"(#{name.inspect} = #{parslet.to_s(prec)})"
end
end
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