Class: Hash

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

Instance Method Summary collapse

Instance Method Details

#_is_empty?(i) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hashlib.rb', line 141

def _is_empty?(i)
  i === nil or (i.is_a?(String) and i.strip.chomp.empty?) or (i.respond_to?(:empty?) and i.empty?)
end

#coalesce(prefix = nil, base = nil, delimiter = '_') ⇒ Object 



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# File 'lib/hashlib.rb', line 101

def coalesce(prefix=nil, base=nil, delimiter='_')
  base = self unless base
  rv = {}

  if base.is_a?(Hash)
    base.each do |k,v|
      if v
        base.coalesce(k,v,delimiter).each do |kk,vv|
          kk = (prefix.to_s+delimiter+kk.to_s) if prefix
          rv[kk.to_s] = vv
        end
      end
    end
  else
    rv[prefix.to_s] = base
  end

  rv
end

#compact ⇒ Object 



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# File 'lib/hashlib.rb', line 140

def compact
  def _is_empty?(i)
    i === nil or (i.is_a?(String) and i.strip.chomp.empty?) or (i.respond_to?(:empty?) and i.empty?)
  end

  each_recurse do |k,v,path|
    path = path.join('.')

    if v.is_a?(Array)
      v.reject!{|i| _is_empty?(i) }
      unset(path) if v.empty?

    else
      unset(path) if _is_empty?(v)
    end

    nil
  end

  self
end

#diff(other) ⇒ Object 



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# File 'lib/hashlib.rb', line 2

def diff(other)
  self.keys.inject({}) do |memo, key|
    unless self[key] == other[key]
      if other[key].is_a?(Hash)
        memo[key] = self[key].diff(other[key])
      else
        memo[key] = [self[key], other[key]]
      end
    end
    memo
  end
end

#each_recurse(root = self, path = [], inplace = false, &block) ⇒ Object 



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# File 'lib/hashlib.rb', line 121

def each_recurse(root=self, path=[], inplace=false, &block)
  root.each do |k,v|
    path << k

    if v.is_a?(Hash)
      each_recurse(v, path, &block)
    else
      rv = yield(k, v, path)
      root[k] = rv if inplace === true
    end

    path.pop
  end
end

#each_recurse!(root = self, path = [], &block) ⇒ Object 



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# File 'lib/hashlib.rb', line 136

def each_recurse!(root=self, path=[], &block)
  each_recurse(root, path, true, &block)
end

#get(path, default = nil) ⇒ Object 



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# File 'lib/hashlib.rb', line 15

def get(path, default=nil)
  rv = self

# make path an array if not already
  if not path.is_a?(Array)
    path = path.split('.')
  end

# step through path components...
  path.each_index do |i|
  # hashes: if the current path component is in the hash, set the pointer
  #            and move on to the next path component
  #         otherwise return default value
  #
    if rv.is_a?(Hash)
      if rv.has_key?(path[i])
        rv = rv[path[i]]
        next
      else
        return default
      end

  # arrays: flatten into one array, iterate over it.  for each element:
  #           if it is a hash, recurse into it from the next path component
  #           otherwise return it
  #         the resulant pointer should be fully populated from this point down
  #
    elsif rv.is_a?(Array)
      rv = (rv.flatten.collect do |j|
        if j.is_a?(Hash)
          j.get(path[(i)..-1], default)
        else
          j
        end
      end).compact

      next

  # scalars: if we're still in this loop and trying to look for a path component
  #          inside of a scalar value, then that won't exist and we just return default
    else
      return default
    end
  end

  return default if rv.nil? or (rv.is_a?(Array) and rv.flatten.compact.empty?)

# good job! you made it here!
  return rv
end

#join(inner_delimiter, outer_delimiter = nil) ⇒ Object 



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# File 'lib/hashlib.rb', line 96

def join(inner_delimiter, outer_delimiter=nil)
  outer_delimiter = inner_delimiter unless outer_delimiter
  self.to_a.collect{|i| i.join(inner_delimiter) }.join(outer_delimiter)
end

#rekey(from, to) ⇒ Object 



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# File 'lib/hashlib.rb', line 90

def rekey(from, to)
  value = get(from)
  unset(from)
  set(to, value)
end

#set(path, value) ⇒ Object 



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# File 'lib/hashlib.rb', line 66

def set(path, value)
  if not path.is_a?(Array)
    path = path.to_s.strip.split(/[\/\.]/)
  end
  root = self

  path[0..-2].each do |p|
    root[p.to_s] = {} unless root[p.to_s].is_a?(Hash)
    root = root[p.to_s]
  end

  if value.nil?
    root.reject!{|k,v| k.to_s == path.last.to_s }
  else
    root[path.last.to_s] = value
  end

  self
end

#unset(path) ⇒ Object 



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# File 'lib/hashlib.rb', line 86

def unset(path)
  set(path, nil)
end