Class: Ree::Contracts::ArgContracts::Splat

Inherits:
Object
  • Object
show all
Includes:
Truncatable
Defined in:
lib/ree/contracts/arg_contracts/splat.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Truncatable

#truncate

Constructor Details

#initialize(contracts) ⇒ Splat

Returns a new instance of Splat.



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# File 'lib/ree/contracts/arg_contracts/splat.rb', line 39

def initialize(contracts)
  @contracts = contracts

  @first_splat_of = contracts.first.is_a?(ArgContracts::SplatOf) ? contracts.first : nil
  @last_splat_of = contracts.size > 1 && contracts.last.is_a?(ArgContracts::SplatOf) ? contracts.last : nil

  @middle_splat_of = if contracts.size > 2
    list = contracts[1..-2]
    idx = list.index { _1.is_a?(ArgContracts::SplatOf) }
    list[idx] if idx
  end

  @middle_splat_of_index = @contracts.index { _1 == @middle_splat_of } if @middle_splat_of
  @validators = contracts.map { Validators.fetch_for(_1) }
end

Class Method Details

.[](*contracts) ⇒ Object 



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# File 'lib/ree/contracts/arg_contracts/splat.rb', line 10

def self.[](*contracts)
  if contracts.empty?
    raise BadContractError, 'Splat contract should accept at least one contract'
  end

  forbidden_class_contracts = Ree::Contracts::Validators::FORBIDDEN_CONTRACTS
  forbidden = Set.new(forbidden_class_contracts.to_a - [ArgContracts::SplatOf])
  
  contracts.each_with_index do |contract, index|
    contract_name = if forbidden_class_contracts.include?(contract)
      contract.to_s
    elsif forbidden.include?(contract.class)
      contract.class.to_s
    end

    if contract_name
      raise BadContractError, "#{contract_name} contract is not allowed to use inside Splat contract"
    end
  end

  splat_of_count = contracts.count { _1.is_a?(ArgContracts::SplatOf) }

  if splat_of_count != 1
    raise BadContractError, "Splat contract should include one SplatOf contract"
  end

  new(contracts)
end

Instance Method Details

#message(value, name, lvl = 1) ⇒ Object 



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# File 'lib/ree/contracts/arg_contracts/splat.rb', line 104

def message(value, name, lvl = 1)
  unless value.is_a?(Array)
    return "expected #{to_s}, got #{value.class} => #{truncate(value.inspect)}"
  end

  errors = []
  sps = "  " * lvl
  
  if @validators.size - 1 > value.size
    return "expected at least #{@validators.size - 1} #{pluralize(@validators.size, 'value', 'values')} for #{to_s}, got #{value.size} #{pluralize(value.size, 'value', 'values')} => #{truncate(value.inspect)}"
  end
  
  if @first_splat_of
    rest_validators = @validators[1..-1]
    rest_validator_count = rest_validators.size

    rest_values = if value.size >= @validators.size
      value[(value.size - rest_validator_count)..-1]
    else
      value
    end

    if rest_validator_count > 0
      rest_validators.each_with_index do |validator, idx|
        val = rest_values[idx]
        next if validator.call(val)
        
        msg = validator.message(val, "#{name}[#{idx + 1}]", lvl + 1)
        errors << "\n\t#{sps} - #{name}[#{idx + 1}]: #{msg}"

        if errors.size > 3
          errors << "\n\t#{sps} - ..."
          break
        end
      end
    end

    if rest_values.size != value.size
      validator = @validators.first
      idx = value.size - rest_validator_count - 1
      val = value[0..idx]

      if !validator.call(val)
        msg = validator.message(val, "#{name}[0..#{idx}]", lvl + 1)
        errors << "\n\t#{sps} - #{name}[0..#{idx}]: #{msg}"
      end
    end
  elsif @last_splat_of
    rest_validators = @validators[0..-2]
    rest_validator_count = rest_validators.size

    rest_values = if value.size >= @validators.size
      value[0..-2]
    else
      value
    end

    if rest_validator_count > 0
      rest_validators.each_with_index do |validator, idx|
        val = rest_values[idx]
        next if validator.call(val)

        msg = validator.message(val, "#{name}[#{idx}]", lvl + 1)
        errors << "\n\t#{sps} - #{name}[#{idx}]: #{msg}"

        if errors.size > 3
          errors << "\n\t#{sps} - ..."
          break
        end
      end
    end

    if rest_values.size != value.size
      validator = @validators.last
      idx = rest_validator_count
      val = value[idx..-1]

      if !validator.call(val)
        msg = validator.message(val, "#{name}[#{idx}..#{value.size - 1}]", lvl + 1)
        errors << "\n\t#{sps} - #{name}[#{idx}..#{value.size - 1}]: #{msg}"
      end
    end
  elsif @middle_splat_of
    left_contract_count = @middle_splat_of_index
    right_contract_count = @validators.size - @middle_splat_of_index - 1

    value[0..left_contract_count - 1].each_with_index do |value, idx|
      validator = @validators[idx]
      next if validator.call(value)

      msg = validator.message(value, "#{name}[#{idx}]", lvl + 1)
      errors << "\n\t#{sps} - #{name}[#{idx}]: #{msg}"

      if errors.size > 3
        errors << "\n\t#{sps} - ..."
        break
      end
    end

    splat_values = if left_contract_count + right_contract_count == value.size
      []
    else
      value[@middle_splat_of_index..value.size - right_contract_count - 1]
    end
    
    if !splat_values.empty?
      validator = @validators[@middle_splat_of_index]

      if !validator.call(splat_values)
        splat_name = "#{name}[#{@middle_splat_of_index}..#{value.size - right_contract_count - 1}]"
        msg = validator.message(splat_values, "#{splat_name}", lvl + 1)
        errors << "\n\t#{sps} - #{splat_name}: #{msg}"
      end
    end

    is_valid = value[value.size - right_contract_count..-1].each_with_index.all? do |value, idx|
      @validators[@middle_splat_of_index + idx + 1].call(value)
    end

    pos = value.size - right_contract_count
    
    value[pos..-1].each_with_index do |value, idx|
      validator = @validators[@middle_splat_of_index + idx + 1]
      next if validator.call(value)

      msg = validator.message(value, "#{name}[#{pos + idx}]", lvl + 1)
      errors << "\n\t#{sps} - #{name}[#{pos + idx}]: #{msg}"

      if errors.size > 3
        errors << "\n\t#{sps} - ..."
        break
      end
    end
  end

  errors.join
end

#to_s ⇒ Object 



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# File 'lib/ree/contracts/arg_contracts/splat.rb', line 100

def to_s
  "Splat[#{@validators.map(&:to_s).join(", ")}]"
end

#valid?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ree/contracts/arg_contracts/splat.rb', line 55

def valid?(value)
  return false if !value.is_a?(Array)
  return false if @validators.size - 1 > value.size
  
  if @first_splat_of
    return valid_with_first?(@validators, value)
  end

  if @last_splat_of
    return valid_with_last?(@validators, value)
  end

  if @middle_splat_of
    # before splat part
    left_contract_count = @middle_splat_of_index
    right_contract_count = @validators.size - @middle_splat_of_index - 1

    is_valid = value[0..left_contract_count - 1].each_with_index.all? do |value, idx|
      @validators[idx].call(value)
    end

    return false if !is_valid

    # splat part
    splat_values = if left_contract_count + right_contract_count == value.size
      []
    else
      value[@middle_splat_of_index..value.size - right_contract_count - 1]
    end
    
    if !splat_values.empty?
      return false if !@validators[@middle_splat_of_index].call(splat_values)
    end

    # after splat part
    is_valid = value[value.size - right_contract_count..-1].each_with_index.all? do |value, idx|
      @validators[@middle_splat_of_index + idx + 1].call(value)
    end

    return false if !is_valid
  end

  return true
end