Class: Riffer::Params

Inherits:
Object
  • Object
show all
Defined in:
lib/riffer/params.rb,
sig/generated/riffer/params.rbs

Overview

A DSL for defining tool parameters and structured-output schemas, used within a Tool's params block.

params do
required :city, String, description: "The city name"
optional :units, String, default: "celsius", enum: ["celsius", "fahrenheit"]
end

Defined Under Namespace

Modules: Boolean Classes: Param

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Params

-- : () -> void



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# File 'lib/riffer/params.rb', line 18

def initialize
  @parameters = []
end

Instance Attribute Details

#parameters ⇒ Array[Riffer::Params::Param] (readonly)

The defined parameters.

Returns:



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# File 'lib/riffer/params.rb', line 14

def parameters
  @parameters
end

Class Method Details

.from_json_schema(schema) ⇒ Riffer::Params

Reconstructs a Params from a JSON Schema object — the inverse of to_json_schema(strict: false). Raises Riffer::ArgumentError on features outside the Params-expressible subset of JSON Schema.

schema = params.to_json_schema(strict: false)
Riffer::Params.from_json_schema(schema) # => equivalent Riffer::Params

-- : (Hash[Symbol, untyped]) -> Riffer::Params

Parameters:

  • (Hash[Symbol, untyped])

Returns:



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# File 'lib/riffer/params.rb', line 31

def self.from_json_schema(schema)
  params = new
  properties = schema[:properties] || {}
  required = (schema[:required] || []).map(&:to_s)

  properties.each do |name, property_schema|
    params.parameters << Riffer::Params::Param.from_json_schema(
      name.to_sym, property_schema, required: required.include?(name.to_s),
    )
  end

  params
end

Instance Method Details

#build_nested(type, of, &block) ⇒ void

This method returns an undefined value.

-- : (Module, Module?) ?{ (Riffer::Params) [self: Riffer::Params] -> void } -> Riffer::Params?

Parameters:

  • (Module)
  • (Module, nil) 


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# File 'lib/riffer/params.rb', line 149

def build_nested(type, of, &block)
  raise Riffer::ArgumentError, "cannot use both of: and a block" if of && block

  if of
    raise Riffer::ArgumentError, "of: can only be used with Array type, got #{type}" unless type == Array

    unless Riffer::Params::Param::PRIMITIVE_TYPES.include?(of)
      primitives = Riffer::Params::Param::PRIMITIVE_TYPES.map(&:name).join(", ")
      raise Riffer::ArgumentError, "of: must be a primitive type (#{primitives}), got #{of}"
    end
    return nil
  end

  return unless block
  unless [Hash, Array].include?(type)
    raise Riffer::ArgumentError, "block can only be used with Hash or Array type, got #{type}"
  end

  nested = Riffer::Params.new
  nested.instance_eval(&block)
  nested
end

#optional(name, type, description: nil, enum: nil, default: nil, of: nil) ⇒ void

This method returns an undefined value.

Defines an optional parameter.

-- : (Symbol, Module, ?description: String?, ?enum: Array?, ?default: untyped, ?of: Module?) ?{ (Riffer::Params) [self: Riffer::Params] -> void } -> void

Parameters:

  • (Symbol)
  • (Module)
  • description: (String, nil) (defaults to: nil)
  • enum: (Array[untyped], nil) (defaults to: nil)
  • default: (Object) (defaults to: nil)
  • of: (Module, nil) (defaults to: nil) 


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# File 'lib/riffer/params.rb', line 66

def optional(name, type, description: nil, enum: nil, default: nil, of: nil, &)
  nested = build_nested(type, of, &)
  @parameters << Riffer::Params::Param.new(
    name: name,
    type: type,
    required: false,
    description: description,
    enum: enum,
    default: default,
    item_type: of,
    nested_params: nested,
  )
end

#required(name, type, description: nil, enum: nil, of: nil) ⇒ void

This method returns an undefined value.

Defines a required parameter.

-- : (Symbol, Module, ?description: String?, ?enum: Array?, ?of: Module?) ?{ (Riffer::Params) [self: Riffer::Params] -> void } -> void

Parameters:

  • (Symbol)
  • (Module)
  • description: (String, nil) (defaults to: nil)
  • enum: (Array[untyped], nil) (defaults to: nil)
  • of: (Module, nil) (defaults to: nil) 


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# File 'lib/riffer/params.rb', line 49

def required(name, type, description: nil, enum: nil, of: nil, &)
  nested = build_nested(type, of, &)
  @parameters << Riffer::Params::Param.new(
    name: name,
    type: type,
    required: true,
    description: description,
    enum: enum,
    item_type: of,
    nested_params: nested,
  )
end

#to_json_schema(strict: false) ⇒ Hash[Symbol, untyped]

Converts all parameters to JSON Schema format. When strict is true, every property is listed in required and optional ones are made nullable instead, satisfying providers that enforce strict structured output schemas.

: (?strict: bool) -> Hash[Symbol, untyped]

Parameters:

  • strict: (Boolean) (defaults to: false)

Returns:

  • (Hash[Symbol, untyped]) 


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# File 'lib/riffer/params.rb', line 128

def to_json_schema(strict: false)
  properties = {} #: Hash[String, untyped]
  required_params = [] #: Array[String]

  @parameters.each do |param|
    properties[param.name.to_s] = param.to_json_schema(strict: strict)
    required_params << param.name.to_s if strict || param.required
  end

  {
    type: "object",
    properties: properties,
    required: required_params,
    additionalProperties: false,
  }
end

#validate(arguments) ⇒ Hash[Symbol, untyped]

Validates arguments against parameter definitions.

Raises Riffer::ValidationError if validation fails.

-- : (Hash[Symbol, untyped]) -> Hash[Symbol, untyped]

Parameters:

  • (Hash[Symbol, untyped])

Returns:

  • (Hash[Symbol, untyped]) 


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# File 'lib/riffer/params.rb', line 86

def validate(arguments)
  validated = {} #: Hash[Symbol, untyped]
  errors = [] #: Array[String]

  @parameters.each do |param|
    value = arguments[param.name]

    if value.nil? && param.required
      errors << "#{param.name} is required"
      next
    end

    if value.nil?
      validated[param.name] = param.default
      next
    end

    unless param.valid_type?(value)
      errors << "#{param.name} must be a #{param.type_name}"
      next
    end

    if param.enum && !param.enum.include?(value)
      errors << "#{param.name} must be one of: #{param.enum.join(', ')}"
      next
    end

    value = validate_nested(param, value, errors)

    validated[param.name] = value
  end

  raise Riffer::ValidationError, errors.join("; ") if errors.any?

  validated
end

#validate_nested(param, value, errors) ⇒ Object

-- : (Riffer::Params::Param, untyped, Array) -> untyped

Parameters:

Returns:

  • (Object) 


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# File 'lib/riffer/params.rb', line 174

def validate_nested(param, value, errors)
  if param.type == Hash && param.nested_params
    validate_nested_hash(param, value, errors)
  elsif param.type == Array && param.nested_params
    validate_nested_array_of_objects(param, value, errors)
  elsif param.type == Array && param.item_type
    validate_typed_array(param, value, errors)
    value
  else
    value
  end
end

#validate_nested_array_of_objects(param, value, errors) ⇒ Array[untyped]

-- : (Riffer::Params::Param, Array, Array) -> Array

Parameters:

Returns:

  • (Array[untyped]) 


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# File 'lib/riffer/params.rb', line 203

def validate_nested_array_of_objects(param, value, errors)
  nested = param.nested_params
  return value unless nested

  value.map.with_index do |item, i|
    unless item.is_a?(Hash)
      errors << "#{param.name}[#{i}] must be an object"
      next item
    end
    nested.validate(item)
  rescue Riffer::ValidationError => e
    e.message.split("; ").each do |msg|
      errors << "#{param.name}[#{i}].#{msg}"
    end
    item
  end
end

#validate_nested_hash(param, value, errors) ⇒ Hash[Symbol, untyped]

-- : (Riffer::Params::Param, Hash[Symbol, untyped], Array) -> Hash[Symbol, untyped]

Parameters:

Returns:

  • (Hash[Symbol, untyped]) 


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# File 'lib/riffer/params.rb', line 189

def validate_nested_hash(param, value, errors)
  nested = param.nested_params
  return value unless nested

  nested.validate(value)
rescue Riffer::ValidationError => e
  e.message.split("; ").each do |msg|
    errors << "#{param.name}.#{msg}"
  end
  value
end

#validate_typed_array(param, value, errors) ⇒ void

This method returns an undefined value.

-- : (Riffer::Params::Param, Array, Array) -> void

Parameters:



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# File 'lib/riffer/params.rb', line 223

def validate_typed_array(param, value, errors)
  item_type = param.item_type
  return unless item_type

  type_name = Riffer::Params::Param::TYPE_MAPPINGS[item_type]
  valid_item = if [Riffer::Params::Boolean, TrueClass, FalseClass].include?(item_type)
                 ->(item) { [true, false].include?(item) }
               else
                 ->(item) { item.is_a?(item_type) }
               end
  value.each_with_index do |item, i|
    errors << "#{param.name}[#{i}] must be a #{type_name}" unless valid_item.call(item)
  end
end