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