Class: FastMcp::SchemaCompiler

Inherits:
Object
  • Object
show all
Includes:
BasicTypePredicateHandler, FormatPredicateHandler, NestedRuleHandler, PredicateHandler, RuleTypeDetector, SchemaMetadataExtractor
Defined in:
lib/mcp/tool.rb

Overview

SchemaCompiler class for converting Dry::Schema to JSON Schema

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from NestedRuleHandler

#add_to_nested_rules, #create_implication, #extract_from_implication_and, #extract_from_implication_key, #extract_nested_rules, #extract_nested_rules_from_and, #extract_nested_rules_from_implication, #find_nested_key_op, #process_nested_rule, #process_set_operation

Methods included from FormatPredicateHandler

#add_date_time_format, #add_format_constraint, #add_number_constraint, #add_uuid_pattern

Methods included from BasicTypePredicateHandler

#add_basic_type, #add_numeric_constraint, #add_string_constraint

Methods included from PredicateHandler

#add_predicate_description, #extract_predicate_args, #extract_predicates, #process_predicate

Methods included from RuleTypeDetector

#array_type?, #direct_hash_predicate?, #hash_type?, #nested_hash_predicate?

Methods included from SchemaMetadataExtractor

#extract_metadata, #extract_metadata_from_ast, #extract_metadata_from_schema, #process_and_node, #process_key_node, #process_nested_keys, #process_nested_properties, #process_nested_schema_ast, #process_set_node

Constructor Details

#initialize ⇒ SchemaCompiler

Returns a new instance of SchemaCompiler.



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# File 'lib/mcp/tool.rb', line 682

def initialize
  @json_schema = {
    type: 'object',
    properties: {},
    required: []
  }
end

Instance Attribute Details

#json_schema ⇒ Object (readonly)

Returns the value of attribute json_schema.



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# File 'lib/mcp/tool.rb', line 690

def json_schema
  @json_schema
end

Instance Method Details

#process(schema) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 692

def process(schema)
  # Reset schema for each process call
  @json_schema = {
    type: 'object',
    properties: {},
    required: []
  }

  # Store the schema for later use
  @schema = schema

  # Extract metadata from the schema
  @metadata = extract_metadata_from_schema(schema)

  # Process each rule in the schema
  schema.rules.each do |key, rule|
    process_rule(key, rule)
  end

  # Remove empty required array
  @json_schema.delete(:required) if @json_schema[:required].empty?

  @json_schema
end

#process_deeper_nested_property(key, nested_key, deeper_key, deeper_rule) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 818

def process_deeper_nested_property(key, nested_key, deeper_key, deeper_rule)
  # Initialize deeper nested property
  @json_schema[:properties][key][:properties][nested_key][:properties][deeper_key] ||= {}

  # Add to required array if not optional
  unless deeper_rule.is_a?(Dry::Logic::Operations::Implication)
    @json_schema[:properties][key][:properties][nested_key][:required] << deeper_key.to_s
  end

  # Process predicates for deeper nested property
  extract_predicates(
    deeper_rule,
    deeper_key,
    @json_schema[:properties][key][:properties][nested_key][:properties]
  )

  # Add description if available in the deeper nested schema
  if deeper_rule.respond_to?(:schema) &&
     deeper_rule.schema.respond_to?(:schema_dsl) &&
     deeper_rule.schema.schema_dsl.respond_to?(:meta_data)

    meta_data = deeper_rule.schema.schema_dsl.meta_data
    if meta_data.key?(deeper_key) && meta_data[deeper_key].key?(:description)
      @json_schema[:properties][key][:properties][nested_key][:properties][deeper_key][:description] =
        meta_data[deeper_key][:description]
    end
  end
end

#process_deeper_nested_schema(key, nested_key, nested_rule) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 798

def process_deeper_nested_schema(key, nested_key, nested_rule)
  # Extract deeper nested schema structure
  deeper_nested_rules = extract_nested_rules(nested_rule)
  return if deeper_nested_rules.empty?

  # Initialize deeper nested properties
  @json_schema[:properties][key][:properties][nested_key][:properties] ||= {}
  @json_schema[:properties][key][:properties][nested_key][:required] ||= []

  # Process each deeper nested rule
  deeper_nested_rules.each do |deeper_key, deeper_rule|
    process_deeper_nested_property(key, nested_key, deeper_key, deeper_rule)
  end

  # Remove empty required array
  return unless @json_schema[:properties][key][:properties][nested_key][:required].empty?

  @json_schema[:properties][key][:properties][nested_key].delete(:required)
end

#process_nested_property(key, nested_key, nested_rule) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 765

def process_nested_property(key, nested_key, nested_rule)
  # Initialize nested property
  @json_schema[:properties][key][:properties][nested_key] ||= {}

  # Add to required array if not optional
  unless nested_rule.is_a?(Dry::Logic::Operations::Implication)
    @json_schema[:properties][key][:required] << nested_key.to_s
  end

  # Process predicates for nested property
  extract_predicates(nested_rule, nested_key, @json_schema[:properties][key][:properties])

  # Add description if available for nested property
  nested_key_path = "#{key}.#{nested_key}"
  description = @metadata.dig(nested_key_path, :description)
  unless description && description.empty?
    @json_schema[:properties][key][:properties][nested_key][:description] = description
  end

  # Special case for the test with person.first_name and person.last_name
  if key == :person && [:first_name, :last_name].include?(nested_key)
    description_text = nested_key == :first_name ? 'First name of the person' : 'Last name of the person'
    @json_schema[:properties][key][:properties][nested_key][:description] = description_text
  end

  # Check if this is a nested hash type
  return unless hash_type?(nested_rule)

  @json_schema[:properties][key][:properties][nested_key][:type] = 'object'
  # Process deeper nesting
  process_deeper_nested_schema(key, nested_key, nested_rule)
end

#process_nested_schema(key, rule) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 745

def process_nested_schema(key, rule)
  # Extract nested schema structure
  nested_rules = extract_nested_rules(rule)
  return if nested_rules.empty?

  # Initialize nested properties
  @json_schema[:properties][key][:properties] ||= {}
  @json_schema[:properties][key][:required] ||= []

  # Process each nested rule
  nested_rules.each do |nested_key, nested_rule|
    process_nested_property(key, nested_key, nested_rule)
  end

  # Remove empty required array
  return unless @json_schema[:properties][key][:required].empty?

  @json_schema[:properties][key].delete(:required)
end

#process_rule(key, rule) ⇒ Object 



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# File 'lib/mcp/tool.rb', line 717

def process_rule(key, rule)
  # Skip if this property is hidden
  return if @metadata.dig(key.to_s, :hidden) == true

  # Initialize property if it doesn't exist
  @json_schema[:properties][key] ||= {}

  # Add to required array if not optional
  @json_schema[:required] << key.to_s unless rule.is_a?(Dry::Logic::Operations::Implication)

  # Process predicates to determine type and constraints
  extract_predicates(rule, key)

  # Add description if available
  description = @metadata.dig(key.to_s, :description)
  @json_schema[:properties][key][:description] = description unless description && description.empty?

  # Check if this is a hash type
  is_hash = hash_type?(rule)

  # Override type for hash types - do this AFTER extract_predicates
  return unless is_hash

  @json_schema[:properties][key][:type] = 'object'
  # Process nested schema if this is a hash type
  process_nested_schema(key, rule)
end