Class: Decoding::Decoders::MapErr

Inherits:

Decoding::Decoder

• Object
• Decoding::Decoder
• Decoding::Decoders::MapErr

Defined in:

lib/decoding/decoders/map_err.rb

Overview

A decoder that replaces the error message of a decoder that failed, leaving successful results untouched.

See Also:

• map_err

Instance Method Summary

• #call(value) ⇒ Decoding::Result<a>
• #initialize(decoder) {|msg, value| ... } ⇒ MapErr constructor

  A new instance of MapErr.

Methods inherited from Decoding::Decoder

#failure, #to_decoder

Constructor Details

#initialize(decoder) {|msg, value| ... } ⇒ MapErr

Returns a new instance of MapErr.

Parameters:

• decoder (Decoding::Decoder<a>)

Yield Parameters:

• msg (String)
• value (Object)

Yield Returns:

• (String)

# File 'lib/decoding/decoders/map_err.rb', line 16

def initialize(decoder, &block)
  @decoder = decoder.to_decoder
  @block = block
  super()
end

Instance Method Details

#call(value) ⇒ Decoding::Result<a>

Parameters:

• value (Object)

Returns:

• (Decoding::Result<a>)

# File 'lib/decoding/decoders/map_err.rb', line 24

def call(value)
  @decoder.call(value).map_err { |f| f.map { @block.call(_1, value) } }
rescue StandardError => e
  err(failure("error in map_err block: #{e.message}"))
end