Class: MetaParse::RepetitionMatcher

Inherits:
Matcher
  • Object
show all
Defined in:
lib/meta_parse.rb

Overview

Matcher subclass matching sub_match repeatedly.

Instance Attribute Summary collapse

Attributes inherited from Matcher

#spec

Instance Method Summary collapse

Methods inherited from Matcher

compile, #inspect, #m, #m?, #match

Constructor Details

#initialize(sub_match, min = 0, max = nil, reducer = nil, initial_value = []) ⇒ RepetitionMatcher

Returns a new instance of RepetitionMatcher.



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# File 'lib/meta_parse.rb', line 265

def initialize(sub_match, min=0, max=nil, reducer=nil, initial_value=[])
  @spec, @min, @max, @reducer, @initial_value = sub_match, min, max, reducer, initial_value
end

Instance Attribute Details

#max ⇒ Object

Match at most max times, if max is present.



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# File 'lib/meta_parse.rb', line 260

def max
  @max
end

#min ⇒ Object

Match at least min times, if min is present.



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# File 'lib/meta_parse.rb', line 257

def min
  @min
end

#reducer ⇒ Object

A proc used to combine match results as by inject, if present.



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# File 'lib/meta_parse.rb', line 263

def reducer
  @reducer
end

Instance Method Details

#match?(scanner, context = nil) ⇒ Boolean

unless min && (matches.count < min)

  case finalizer
  when Proc
    finalizer.call(matches, *finalizer_args)
  when Symbol
    send(finalizer, matches, *finalizer_args)
  when nil 
    matches
  end
end

end

Returns:

  • (Boolean) 


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# File 'lib/meta_parse.rb', line 295

def match?(scanner, context=nil)
  # Need to copy the initial value since it is potentially destructively modified (if an array, for example).
  acc = begin @initial_value.dup
        rescue TypeError
          @initial_value
        end
  match_count = 0

  while (!max || (match_count < max)) && (one_match = spec.match(scanner))
    match_count += 1
    if reducer
      acc = reducer.call(acc, one_match)
    else
      acc << one_match
    end
  end
  unless min && (match_count < min)
    acc
  end
end

#show ⇒ Object 



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# File 'lib/meta_parse.rb', line 316

def show
  "[#{min}, #{max}] #{ spec.show }"
end

#stateful ⇒ Object

RepetitionMatcher is stateful.



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# File 'lib/meta_parse.rb', line 272

def stateful
  true
end