Class: Hash

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

Instance Method Summary collapse

Instance Method Details

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



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# File 'lib/hashlib.rb', line 185

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 255

def compact()
  return each_recurse do |k,v,p,dhm|
    if v.nil? or (v.respond_to?(:empty?) and v.empty?)
      dhm.unset(p)
    end
  end
end

#diff(other) ⇒ Object 



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# File 'lib/hashlib.rb', line 47

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(options = {}, &block) ⇒ Object 



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# File 'lib/hashlib.rb', line 205

def each_recurse(options={}, &block)
  rv = {}
  dhm = (options[:dhm] || DeferredHashManipulator.new(rv))

  self.inject(rv) do |h, (k, v)|
    path = [*options[:path]]+[k]

    h[k] = v

    if v.is_a?(Hash)
      if options[:intermediate] === true
        yield(k.to_s, v, path, dhm)
      end

      v.each_recurse(options.merge({
        :path => path,
        :dhm  => dhm
      }), &block)

    elsif v.is_a?(Array) and v.first.is_a?(Hash)
      v.each.with_index do |vv,i|
        if vv.is_a?(Hash)
          pp = path[0..-2]+["#{path[-1]}[#{i}]"]

          if options[:intermediate] === true
            yield(k.to_s, vv, pp, dhm)
          end

          vv.each_recurse(options.merge({
            :path  => pp,
            :dhm   => dhm
          }), &block)
        end
      end

    else
      yield(k.to_s, v, path, dhm)
    end

    h
  end

  if options[:dhm].nil?
  # apply any pending operations accumulated from the inject() loop and return
    return dhm.apply()
  else
    return rv
  end
end

#get(path, default = nil) ⇒ Object 



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# File 'lib/hashlib.rb', line 60

def get(path, default=nil)
  rget(path, default)
end

#join(inner_delimiter, outer_delimiter = nil) ⇒ Object 



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# File 'lib/hashlib.rb', line 180

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 174

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

#rget(path, default = nil) ⇒ Object 



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# File 'lib/hashlib.rb', line 68

def rget(path, default=nil)
  path = path.split('.') if path.is_a?(String)
  return default if path.nil? or (path.respond_to?(:empty?) and path.empty?)

# arrayify all paths
  path = [*path]

  root = self.stringify_keys()
  key = path.first.to_s
  rest = path[1..-1]

  if root.has_key?(key)
    if root[key].is_a?(Hash)
      if rest.empty?
        if root[key].nil?
          return default
        else
          return root[key]
        end
      else
        return root[key].rget(rest, default)
      end
    elsif root[key].is_a?(Array) and root[key].first.is_a?(Hash)
      if rest.empty?
        if root[key].nil?
          return default
        else
          return root[key]
        end
      else
        return root[key].collect{|v|
          v.rget(rest, default)
        }.flatten
      end
    else
      if root[key].nil?
        return default
      else
        return root[key]
      end
    end
  else
    return default
  end
end

#rset(path, value, options = {}) ⇒ Object 



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# File 'lib/hashlib.rb', line 115

def rset(path, value, options={})
  path = path.split('.') if path.is_a?(String)
  return nil if path.nil? or path.empty?

# arrayify all paths
  path = [*path]
  key = path.first.to_s

  if key =~ /^([^\]]+)\[(\d+)\]$/
    key = $1
    index = $2.to_i
  end

  rest = path[1..-1]

# stringify the key we're processing
  if (self.has_key?(key.to_sym) rescue false)
    self[key] = self.delete(key.to_sym)
  end

  if rest.empty?
    if options[:delete_nil] === true and value.nil?
      self.delete(key)
    else
      self[key] = value
    end
  else
    if self[key].is_a?(Array) and self[key].first.is_a?(Hash)
    # set only on a specific array item
    # key will be in the form key[0], key[1], key[n]
    #
      if not index.nil?
        self[key][index].rset(rest, value, options) unless self[key][index].nil?

    # set path on all array items
      else
        self[key] = self[key].collect{|v|
          v.rset(rest, value, options)
        }.compact
      end
    else
      if not self[key].is_a?(Hash)
        self[key] = {}
      end

      self[key].rset(rest, value, options)
    end

  end

  self
end

#set(path, value) ⇒ Object 



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# File 'lib/hashlib.rb', line 64

def set(path, value)
  rset(path, value)
end

#stringify_keys ⇒ Object 



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

def stringify_keys()
  rv = {}
  each do |k, v|
    if v.is_a?(Hash)
      v = v.stringify_keys()
    elsif v.is_a?(Array)
      v = v.collect do |i|
        if i.is_a?(Hash)
          i.stringify_keys()
        else
          i
        end
      end
    end

    rv[k.to_s] = v
  end

  return rv
end

#symbolize_keys ⇒ Object 



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# File 'lib/hashlib.rb', line 284

def symbolize_keys()
  rv = {}
  each do |k, v|
    if v.is_a?(Hash)
      v = v.symbolize_keys()
    elsif v.is_a?(Array)
      v = v.collect do |i|
        if i.is_a?(Hash)
          i.symbolize_keys()
        else
          i
        end
      end
    end

    rv[(k.to_sym rescue k)] = v
  end
  return rv
end

#unset(path) ⇒ Object 



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# File 'lib/hashlib.rb', line 168

def unset(path)
  rset(path, nil, {
    :delete_nil => true
  })
end