Class: TRuby::TypeChecker

Inherits:
Object
  • Object
show all
Defined in:
lib/t_ruby/type_checker.rb

Overview

Main type checker with SMT solver integration

Direct Known Subclasses

LegacyTypeChecker, SMTTypeChecker

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(use_smt: true) ⇒ TypeChecker

Returns a new instance of TypeChecker.



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# File 'lib/t_ruby/type_checker.rb', line 177

def initialize(use_smt: true)
  @errors = []
  @warnings = []
  @hierarchy = TypeHierarchy.new
  @inferencer = TypeInferencer.new
  @function_signatures = {}
  @type_aliases = {}
  @current_scope = TypeScope.new
  @flow_context = FlowContext.new
  @use_smt = use_smt
  @smt_solver = SMT::ConstraintSolver.new if use_smt
  @smt_inference_engine = SMT::TypeInferenceEngine.new if use_smt
end

Instance Attribute Details

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



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# File 'lib/t_ruby/type_checker.rb', line 175

def errors
  @errors
end

#hierarchy ⇒ Object (readonly)

Returns the value of attribute hierarchy.



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# File 'lib/t_ruby/type_checker.rb', line 175

def hierarchy
  @hierarchy
end

#inferencer ⇒ Object (readonly)

Returns the value of attribute inferencer.



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# File 'lib/t_ruby/type_checker.rb', line 175

def inferencer
  @inferencer
end

#smt_solver ⇒ Object (readonly)

Returns the value of attribute smt_solver.



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# File 'lib/t_ruby/type_checker.rb', line 175

def smt_solver
  @smt_solver
end

#use_smt ⇒ Object (readonly)

Returns the value of attribute use_smt.



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# File 'lib/t_ruby/type_checker.rb', line 175

def use_smt
  @use_smt
end

#warnings ⇒ Object (readonly)

Returns the value of attribute warnings.



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# File 'lib/t_ruby/type_checker.rb', line 175

def warnings
  @warnings
end

Instance Method Details

#check_assignment(variable, value, declared_type: nil, location: nil) ⇒ Object

Check variable assignment



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# File 'lib/t_ruby/type_checker.rb', line 387

def check_assignment(variable, value, declared_type: nil, location: nil)
  value_type = infer_type(value)

  if declared_type && !type_compatible?(value_type, declared_type)
    add_error(
      message: "Cannot assign #{value_type} to variable of type #{declared_type}",
      expected: declared_type,
      actual: value_type,
      location: location
    )
    return false
  end

  @current_scope.define(variable, declared_type || value_type)
  true
end

#check_call(function_name, arguments, location: nil) ⇒ Object

Check a function call



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# File 'lib/t_ruby/type_checker.rb', line 321

def check_call(function_name, arguments, location: nil)
  signature = @function_signatures[function_name]

  unless signature
    add_warning("Unknown function: #{function_name}", location)
    return nil
  end

  params = signature[:params]

  # Check argument count
  if arguments.length != params.length
    add_error(
      message: "Wrong number of arguments for #{function_name}",
      expected: "#{params.length} arguments",
      actual: "#{arguments.length} arguments",
      location: location
    )
    return nil
  end

  # Check each argument type
  params.each_with_index do |param, idx|
    next unless param[:type]

    arg = arguments[idx]
    arg_type = infer_type(arg)

    next unless arg_type

    next if type_compatible?(arg_type, param[:type])

    add_error(
      message: "Type mismatch in argument '#{param[:name]}' of #{function_name}",
      expected: param[:type],
      actual: arg_type,
      suggestion: suggest_conversion(arg_type, param[:type]),
      location: location
    )
  end

  signature[:return_type]
end

#check_function(function_info, body_lines) ⇒ Object

Check a complete function



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# File 'lib/t_ruby/type_checker.rb', line 506

def check_function(function_info, body_lines)
  @current_scope = TypeScope.new

  # Register parameters in scope
  function_info[:params].each do |param|
    @current_scope.define(param[:name], param[:type] || "Object")
  end

  # Register function signature
  register_function(
    function_info[:name],
    params: function_info[:params],
    return_type: function_info[:return_type]
  )

  # Check body (simplified - real implementation would parse AST)
  body_lines.each_with_index do |line, idx|
    check_statement(line, location: "line #{idx + 1}")
  end
end

#check_function_legacy(method_ir) ⇒ Object

Check function without SMT (legacy)



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# File 'lib/t_ruby/type_checker.rb', line 623

def check_function_legacy(method_ir)
  @current_scope = TypeScope.new

  # Register parameters
  method_ir.params.each do |param|
    param_type = infer_param_type(param)
    @current_scope.define(param.name, param_type)
  end

  # Register function signature
  register_function(
    method_ir.name,
    params: method_ir.params.map { |p| { name: p.name, type: infer_param_type(p) } },
    return_type: method_ir.return_type&.to_s || "Object"
  )
end

#check_interface(interface_ir) ⇒ Object

Check interface implementation



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# File 'lib/t_ruby/type_checker.rb', line 245

def check_interface(interface_ir)
  interface_ir.members.each do |member|
    # Validate member type signature
    if member.type_signature
      validate_type(member.type_signature)
    end
  end
end

#check_method_with_smt(method_ir) ⇒ Object

Check a method definition using SMT solver



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# File 'lib/t_ruby/type_checker.rb', line 217

def check_method_with_smt(method_ir)
  result = @smt_inference_engine.infer_method(method_ir)

  if result[:success]
    # Store inferred types
    @function_signatures[method_ir.name] = {
      params: method_ir.params.map do |p|
        {
          name: p.name,
          type: result[:params][p.name] || infer_param_type(p),
        }
      end,
      return_type: result[:return_type],
    }
  else
    # Add errors from SMT solver
    result[:errors]&.each do |error|
      add_error(
        message: "Type inference error in #{method_ir.name}: #{error}",
        location: method_ir.location
      )
    end
  end

  result
end

#check_operator(left_type, operator, right_type, location: nil) ⇒ Object

Check operator usage



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# File 'lib/t_ruby/type_checker.rb', line 427

def check_operator(left_type, operator, right_type, location: nil)
  # Arithmetic operators
  if %w[+ - * / %].include?(operator)
    if left_type == "String" && operator == "+"
      unless right_type == "String"
        add_error(
          message: "Cannot concatenate String with #{right_type}",
          expected: "String",
          actual: right_type,
          suggestion: "Use .to_s to convert to String",
          location: location
        )
      end
      return "String"
    end

    unless numeric_type?(left_type) && numeric_type?(right_type)
      add_error(
        message: "Operator '#{operator}' requires numeric operands",
        expected: "Numeric",
        actual: "#{left_type} #{operator} #{right_type}",
        location: location
      )
      return nil
    end

    # Result type depends on operands
    return "Float" if left_type == "Float" || right_type == "Float"

    return "Integer"
  end

  # Comparison operators
  if %w[== != < > <= >=].include?(operator)
    return "Boolean"
  end

  # Logical operators
  if %w[&& ||].include?(operator)
    return right_type # Short-circuit returns right operand type
  end

  nil
end

#check_program(ir_program) ⇒ Object

Check an IR program using SMT-based type checking



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# File 'lib/t_ruby/type_checker.rb', line 192

def check_program(ir_program)
  return check_program_legacy(ir_program) unless @use_smt

  @errors = []
  @warnings = []

  ir_program.declarations.each do |decl|
    case decl
    when IR::TypeAlias
      register_alias(decl.name, decl.definition)
    when IR::Interface
      check_interface(decl)
    when IR::MethodDef
      check_method_with_smt(decl)
    end
  end

  {
    success: @errors.empty?,
    errors: @errors,
    warnings: @warnings,
  }
end

#check_program_legacy(ir_program) ⇒ Object

Legacy program check (without SMT)



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# File 'lib/t_ruby/type_checker.rb', line 600

def check_program_legacy(ir_program)
  @errors = []
  @warnings = []

  ir_program.declarations.each do |decl|
    case decl
    when IR::TypeAlias
      register_alias(decl.name, decl.definition)
    when IR::Interface
      check_interface(decl)
    when IR::MethodDef
      check_function_legacy(decl)
    end
  end

  {
    success: @errors.empty?,
    errors: @errors,
    warnings: @warnings,
  }
end

#check_property_access(receiver_type, property_name, location: nil) ⇒ Object

Check property access



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# File 'lib/t_ruby/type_checker.rb', line 405

def check_property_access(receiver_type, property_name, location: nil)
  # Known properties for common types
  known_properties = {
    "String" => %w[length size empty? chars bytes],
    "Array" => %w[length size first last empty? count],
    "Hash" => %w[keys values size empty? length],
    "Integer" => %w[abs to_s to_f even? odd? positive? negative?],
    "Float" => %w[abs to_s to_i ceil floor round],
  }

  properties = known_properties[receiver_type]
  return nil unless properties

  unless properties.include?(property_name)
    add_warning("Property '#{property_name}' may not exist on type #{receiver_type}", location)
  end

  # Return expected type for known properties
  infer_property_type(receiver_type, property_name)
end

#check_return(value, expected_type, location: nil) ⇒ Object

Check a return statement



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# File 'lib/t_ruby/type_checker.rb', line 366

def check_return(value, expected_type, location: nil)
  return true unless expected_type

  actual_type = infer_type(value)
  return true unless actual_type

  unless type_compatible?(actual_type, expected_type)
    add_error(
      message: "Return type mismatch",
      expected: expected_type,
      actual: actual_type,
      suggestion: suggest_conversion(actual_type, expected_type),
      location: location
    )
    return false
  end

  true
end

#check_statement(line, location: nil) ⇒ Object

Check a statement



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# File 'lib/t_ruby/type_checker.rb', line 528

def check_statement(line, location: nil)
  line = line.strip

  # Return statement
  if line.match?(/^return\s+(.+)/)
    line.match(/^return\s+(.+)/)
    # Would need current function context for proper checking
    return
  end

  # Assignment
  if line.match?(/^(\w+)\s*=\s*(.+)/)
    match = line.match(/^(\w+)\s*=\s*(.+)/)
    check_assignment(match[1], match[2], location: location)
    return
  end

  # Method call
  if line.match?(/(\w+)\(([^)]*)\)/)
    match = line.match(/(\w+)\(([^)]*)\)/)
    args = match[2].split(",").map(&:strip)
    check_call(match[1], args, location: location)
  end
end

#diagnostics ⇒ Object

Get all diagnostics



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# File 'lib/t_ruby/type_checker.rb', line 571

def diagnostics
  @errors.map { |e| e.respond_to?(:to_diagnostic) ? e.to_diagnostic : { type: :error, message: e.to_s } } +
    @warnings.map { |w| { type: :warning, message: w } }
end

#infer_param_type(param) ⇒ Object

Infer parameter type from annotation



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# File 'lib/t_ruby/type_checker.rb', line 586

def infer_param_type(param)
  if param.type_annotation
    case param.type_annotation
    when IR::SimpleType
      param.type_annotation.name
    else
      param.type_annotation.to_s
    end
  else
    "Object"
  end
end

#known_type?(type_name) ⇒ Boolean

Check if a type name is known

Returns:

  • (Boolean) 


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# File 'lib/t_ruby/type_checker.rb', line 577

def known_type?(type_name)
  return true if %w[String Integer Float Boolean Array Hash Symbol void nil Object Numeric
                    Enumerable].include?(type_name)
  return true if @type_aliases.key?(type_name)

  false
end

#narrow_in_conditional(condition, then_scope, else_scope = nil) ⇒ Object

Handle conditional type narrowing



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# File 'lib/t_ruby/type_checker.rb', line 473

def narrow_in_conditional(condition, then_scope, else_scope = nil)
  # Parse type guards from condition
  if condition.match?(/(\w+)\.is_a\?\((\w+)\)/)
    match = condition.match(/(\w+)\.is_a\?\((\w+)\)/)
    var = match[1]
    type = match[2]

    # In then branch, variable is narrowed to the type
    then_scope.narrow(var, type)

    # In else branch, variable is NOT that type (can't narrow further without more info)
  end

  if condition.match?(/(\w+)\.nil\?/)
    match = condition.match(/(\w+)\.nil\?/)
    var = match[1]

    then_scope.narrow(var, "nil")
    # In else branch, variable is not nil
    else_scope&.narrow(var, remove_nil_from_type(@current_scope.lookup(var) || "Object"))
  end

  return unless condition.match?(/!(\w+)\.nil\?/)

  match = condition.match(/!(\w+)\.nil\?/)
  var = match[1]

  # Variable is not nil in then branch
  then_scope.narrow(var, remove_nil_from_type(@current_scope.lookup(var) || "Object"))
  else_scope&.narrow(var, "nil")
end

#register_alias(name, definition) ⇒ Object

Register a type alias



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# File 'lib/t_ruby/type_checker.rb', line 316

def register_alias(name, definition)
  @type_aliases[name] = definition
end

#register_function(name, params:, return_type:) ⇒ Object

Register a function signature



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# File 'lib/t_ruby/type_checker.rb', line 308

def register_function(name, params:, return_type:)
  @function_signatures[name] = {
    params: params,
    return_type: return_type,
  }
end

#reset ⇒ Object

Clear all state



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# File 'lib/t_ruby/type_checker.rb', line 559

def reset
  @errors.clear
  @warnings.clear
  @function_signatures.clear
  @type_aliases.clear
  @current_scope = TypeScope.new
  @flow_context = FlowContext.new
  @smt_solver = SMT::ConstraintSolver.new if @use_smt
  @smt_inference_engine = SMT::TypeInferenceEngine.new if @use_smt
end

#resolve_type(type_name) ⇒ Object

Resolve type alias



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# File 'lib/t_ruby/type_checker.rb', line 554

def resolve_type(type_name)
  @type_aliases[type_name] || type_name
end

#subtype_with_smt?(subtype, supertype) ⇒ Boolean

SMT-based subtype checking

Returns:

  • (Boolean) 


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# File 'lib/t_ruby/type_checker.rb', line 281

def subtype_with_smt?(subtype, supertype)
  return true if subtype == supertype

  if @use_smt
    sub = to_smt_type(subtype)
    sup = to_smt_type(supertype)
    @smt_solver.subtype?(sub, sup)
  else
    @hierarchy.subtype_of?(subtype.to_s, supertype.to_s)
  end
end

#to_smt_type(type) ⇒ Object

Convert to SMT type



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# File 'lib/t_ruby/type_checker.rb', line 294

def to_smt_type(type)
  case type
  when String
    SMT::ConcreteType.new(type)
  when IR::SimpleType
    SMT::ConcreteType.new(type.name)
  when SMT::ConcreteType, SMT::TypeVar
    type
  else
    SMT::ConcreteType.new(type.to_s)
  end
end

#validate_type(type_node) ⇒ Object

Validate a type node is well-formed



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# File 'lib/t_ruby/type_checker.rb', line 255

def validate_type(type_node)
  case type_node
  when IR::SimpleType
    # Check if type exists
    unless known_type?(type_node.name)
      add_warning("Unknown type: #{type_node.name}")
    end
  when IR::GenericType
    # Check base type and type args
    unless known_type?(type_node.base)
      add_warning("Unknown generic type: #{type_node.base}")
    end
    type_node.type_args.each { |t| validate_type(t) }
  when IR::UnionType
    type_node.types.each { |t| validate_type(t) }
  when IR::IntersectionType
    type_node.types.each { |t| validate_type(t) }
  when IR::NullableType
    validate_type(type_node.inner_type)
  when IR::FunctionType
    type_node.param_types.each { |t| validate_type(t) }
    validate_type(type_node.return_type)
  end
end