Class: Luoma::ChainHash

Inherits:
Object
  • Object
show all
Defined in:
lib/luoma/chain_hash.rb,
sig/luoma/chain_hash.rbs

Overview

Combine multiple hashes for sequential lookup.

Instance Method Summary collapse

Constructor Details

#initialize(*hashes) ⇒ ChainHash

(*_Namespace) -> void

Parameters:



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# File 'lib/luoma/chain_hash.rb', line 7

def initialize(*hashes)
  @hashes = hashes.to_a
end

Instance Method Details

#[](key) ⇒ Object

(String) -> untyped

Parameters:

  • key (String)

Returns:

  • (Object) 


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# File 'lib/luoma/chain_hash.rb', line 12

def [](key)
  index = @hashes.length - 1
  while index >= 0
    h = @hashes[index]
    index -= 1
    v = h.fetch(key, :nothing)
    return v unless v == :nothing
  end
end

#fetch(key, default = :nothing) ⇒ Object

(String, untyped) -> untyped

Parameters:

  • key (String)
  • default (Object) (defaults to: :nothing)

Returns:

  • (Object) 


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# File 'lib/luoma/chain_hash.rb', line 36

def fetch(key, default = :nothing)
  index = @hashes.length - 1
  while index >= 0
    h = @hashes[index]
    index -= 1
    v = h.fetch(key, :nothing)
    return v unless v == :nothing
  end

  default
end

#key?(key) ⇒ Object

(String) -> bool

Parameters:

  • key (String)

Returns:

  • (Object) 


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# File 'lib/luoma/chain_hash.rb', line 23

def key?(key)
  index = @hashes.length - 1
  while index >= 0
    h = @hashes[index]
    index -= 1
    v = h.fetch(key, :nothing)
    return true unless v == :nothing
  end

  false
end

#nil? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/luoma/chain_hash.rb', line 52

def nil? = false

#pop ⇒ _Namespace?

Returns:



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# File 'lib/luoma/chain_hash.rb', line 51

def pop = @hashes.pop

#push(hash) ⇒ void Also known as: <<

This method returns an undefined value.

Parameters:



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# File 'lib/luoma/chain_hash.rb', line 49

def push(hash) = @hashes << hash

#size ⇒ Integer

Returns:

  • (Integer) 


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# File 'lib/luoma/chain_hash.rb', line 48

def size = @hashes.length