Class: Patm::Pattern::Hash

Inherits:
Patm::Pattern show all
Defined in:
lib/patm.rb

Instance Method Summary collapse

Methods inherited from Patm::Pattern

#&, #[], build_from, build_from_array, build_from_hash, #compile, #opt, #opt?, #rest?

Constructor Details

#initialize(hash, exact) ⇒ Hash

Returns a new instance of Hash.



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# File 'lib/patm.rb', line 128

def initialize(hash, exact)
  @pat = hash
  @exact = exact
  @non_opt_count = @pat.values.count{|v| !v.opt? }
end

Instance Method Details

#compile_internal(free_index, target_name = "_obj") ⇒ Object 



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# File 'lib/patm.rb', line 146

def compile_internal(free_index, target_name = "_obj")
  i = free_index
  ctxs = []
  src = []

  ctxs << [@pat]
  i += 1

  pat = "_ctx[#{free_index}]"
  src << "#{target_name}.is_a?(::Hash)"
  src << "#{target_name}.size >= #{@non_opt_count}"
  if @exact
    src << "#{target_name}.keys.all?{|k| #{pat}.has_key?(k) }"
  end
  tname = "#{target_name}_elm"
  @pat.each do|k, v|
    key_src, c, i = Util.compile_value(k, i)
    ctxs << c
    s, c, i = v.compile_internal(i, tname)
    body =
      if s
        "(#{tname} = #{target_name}[#{key_src}]; #{s})"
      else
        "true"
      end
    src <<
      if v.opt?
        "(!#{target_name}.has_key?(#{key_src}) || #{body})"
      else
        "(#{target_name}.has_key?(#{key_src}) && #{body})"
      end
    ctxs << c
  end
  [
    src.join(" &&\n"),
    ctxs.flatten(1),
    i,
  ]
end

#execute(match, obj) ⇒ Object 



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# File 'lib/patm.rb', line 133

def execute(match, obj)
  return false unless obj.is_a?(::Hash)
  obj.size >= @non_opt_count &&
    (!@exact || obj.keys.all?{|k| @pat.has_key?(k) }) &&
    @pat.all? {|k, pat|
      if obj.has_key?(k)
        pat.execute(match, obj[k])
      else
        pat.opt?
      end
    }
end

#inspect ⇒ Object 



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# File 'lib/patm.rb', line 145

def inspect; @pat.inspect; end