Module: Rigor::Inference::MethodDispatcher

Defined in:
lib/rigor/inference/method_dispatcher.rb,
lib/rigor/inference/method_dispatcher/cgi_folding.rb,
lib/rigor/inference/method_dispatcher/set_folding.rb,
lib/rigor/inference/method_dispatcher/uri_folding.rb,
lib/rigor/inference/method_dispatcher/call_context.rb,
lib/rigor/inference/method_dispatcher/data_folding.rb,
lib/rigor/inference/method_dispatcher/file_folding.rb,
lib/rigor/inference/method_dispatcher/math_folding.rb,
lib/rigor/inference/method_dispatcher/rbs_dispatch.rb,
lib/rigor/inference/method_dispatcher/time_folding.rb,
lib/rigor/inference/method_dispatcher/block_folding.rb,
lib/rigor/inference/method_dispatcher/method_folding.rb,
lib/rigor/inference/method_dispatcher/reduce_folding.rb,
lib/rigor/inference/method_dispatcher/regexp_folding.rb,
lib/rigor/inference/method_dispatcher/shape_dispatch.rb,
lib/rigor/inference/method_dispatcher/struct_folding.rb,
lib/rigor/inference/method_dispatcher/kernel_dispatch.rb,
lib/rigor/inference/method_dispatcher/constant_folding.rb,
lib/rigor/inference/method_dispatcher/iterator_dispatch.rb,
lib/rigor/inference/method_dispatcher/overload_selector.rb,
lib/rigor/inference/method_dispatcher/receiver_affinity.rb,
lib/rigor/inference/method_dispatcher/singleton_folding.rb,
lib/rigor/inference/method_dispatcher/array_to_h_folding.rb,
lib/rigor/inference/method_dispatcher/shellwords_folding.rb,
lib/rigor/inference/method_dispatcher/literal_string_folding.rb,
lib/rigor/inference/method_dispatcher/member_shape_projection.rb,
sig/rigor/inference.rbs

Overview

Coordinates method dispatch for the inference engine.

Given (receiver_type, method_name, arg_types, block_type, environment), the dispatcher returns the inferred result type or nil when no rule matches. nil is a deliberately blunt "I don't know" signal: callers (today only ExpressionTyper) own the fail-soft fallback and decide whether to record a FallbackTracer event.

Tier order is documented inline in resolve; the precise-tier group is built from PRECISE_TIERS_HEAD, STDLIB_SINGLETON_FOLDERS, and PRECISE_TIERS_TAIL. ShapeDispatch runs above RbsDispatch so a precise per-position/per-key answer wins over the projected Array#[]/Hash#fetch RBS answer.

The block_type: and plugin contribution (dynamic_return) tiers landed in Slice 6 phase C and v0.1.1 Track 2 respectively; all call sites pass through dispatch/resolve unchanged.

Defined Under Namespace

Modules: ArrayToHFolding, BlockFolding, CGIFolding, ConstantFolding, DataFolding, FileFolding, IteratorDispatch, KernelDispatch, LiteralStringFolding, MathFolding, MemberShapeProjection, MethodFolding, OverloadSelector, RbsDispatch, ReceiverAffinity, ReduceFolding, RegexpFolding, SetFolding, ShapeDispatch, ShellwordsFolding, SingletonFolding, StructFolding, TimeFolding, URIFolding, _DispatchTier Classes: CallContext

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.array_new_fill(type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1023

def array_new_fill(type)
  return Type::Combinator.constant_of(nil) if type.nil?

  type
end

.array_new_lift(class_name, arg_types) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1006

def array_new_lift(class_name, arg_types)
  return nil unless class_name == "Array"
  return nil if arg_types.empty? || arg_types.size > 2

  size = array_new_size(arg_types.first)
  return nil if size.nil? || size.negative? || size > ARRAY_NEW_TUPLE_LIMIT

  fill = array_new_fill(arg_types[1])
  Type::Combinator.tuple_of(*Array.new(size, fill))
end

.array_new_size(type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1017

def array_new_size(type)
  return nil unless type.is_a?(Type::Constant) && type.value.is_a?(Integer)

  type.value
end

.boundary_cross_class_name(receiver_type, environment, rbs_result) ⇒ Object

Composite preflight for #record_boundary_cross_if_applicable. Returns the receiver class name only when every prerequisite for emitting the diagnostic is satisfied (environment carries an index + reporter, receiver is a nominal carrier, RBS-side result is not the trivial Dynamic[Top] envelope). Returns nil to short-circuit otherwise.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 604

def boundary_cross_class_name(receiver_type, environment, rbs_result)
  return nil if environment.nil?
  return nil if environment.dependency_source_index.nil?
  return nil if environment.dependency_source_index.empty?
  return nil if environment.boundary_cross_reporter.nil?
  return nil if rbs_result_untyped?(rbs_result)

  dep_source_class_name(receiver_type)
end

.budget_silence_result(class_name, index, _environment) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 624

def budget_silence_result(class_name, index, _environment)
  return nil unless index.budget_overrun_strategy == :dependency_silence

  owning_gem = index.gem_for(class_name)
  return nil if owning_gem.nil?
  return nil unless index.budget_exceeded.include?(owning_gem)

  Type::Combinator.untyped
end

.class_new_lift(class_name, arg_types) ⇒ Object

Class.new and Class.new(Parent) create a brand-new anonymous class. Statically that class is representable as the parent's singleton type — its singleton-method surface is the parent's (plus whatever the block defines, which we do not statically track here), so Singleton[Parent] lets downstream klass.some_class_method resolve. No parent → singleton(Object). Anything else (dynamic parent, more than one positional, …) falls back to Nominal[Class] via the surrounding meta_new tail.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 958

def class_new_lift(class_name, arg_types)
  return nil unless class_name == "Class"
  return Type::Combinator.singleton_of("Object") if arg_types.empty?
  return nil unless arg_types.size == 1

  parent = arg_types.first
  return parent if parent.is_a?(Type::Singleton)

  nil
end

.collect_gated_contributions(index, relevant, name, call_node, scope, receiver_type) ⇒ Object

The post-gate walk, in registry order — the same order the ungated walk used.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 692

def collect_gated_contributions(index, relevant, name, call_node, scope, receiver_type)
  result = nil
  relevant.each do |plugin|
    next unless index.dynamic_candidate_for?(plugin, name)

    dynamic = plugin.dynamic_return_type(call_node: call_node, scope: scope, receiver_type: receiver_type)
    (result ||= []) << FlowContribution.new(return_type: dynamic) if dynamic
  rescue StandardError
    next
  end
  result || EMPTY_CONTRIBUTIONS
end

.collect_plugin_contributions(registry, call_node, scope, receiver_type) ⇒ Object

Collects every plugin's flow / dynamic-return contribution for one call site. Two prunings keep this off the hot path on plugin-heavy projects (it was the #1 allocation site and a top CPU cost):

  1. Only the plugins that structurally implement a per-call path are visited — registry.contribution_index.for_method_dispatch is the registry-ordered subset declaring a dynamic_return. Iterating the subset in registry order, and gating each path by membership, yields the exact same contributions in the same order as visiting every plugin would (a skipped plugin's call returns nil/[] anyway). The receiver-class ancestry match still happens per dispatch inside dynamic_return_type.
  2. Contributions accumulate lazily — allocate only when one actually appears, and share a frozen empty array otherwise. The caller treats the result as read-only (.empty? / Merger.merge).
  3. ADR-52 WD1 — method-name gates compiled at registry build. The global gate makes the common "no plugin cares about this call" case a single Set probe; the per-plugin gate skips a plugin whose dynamic_return rules are all methods:-gated on other names. A pruned consultation could only have returned nil, so contribution order and content are unchanged.


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# File 'lib/rigor/inference/method_dispatcher.rb', line 675

def collect_plugin_contributions(registry, call_node, scope, receiver_type)
  index = registry.contribution_index
  relevant = index.for_method_dispatch
  return EMPTY_CONTRIBUTIONS if relevant.empty?

  # `call_node` is not always a CallNode — the `&:symbol` block path dispatches with the
  # `Prism::BlockArgumentNode` itself (`ExpressionTyper#symbol_block_return_type`). A bare
  # `.name` here raised, and the raise was silently absorbed by `block_return_type_for`'s
  # rescue, nil-ing the block type and flipping `select(&:p)`-style calls onto their
  # no-block Enumerator overloads (caught by the GitLab corpus gate).
  name = call_node.respond_to?(:name) ? call_node.name : nil
  return EMPTY_CONTRIBUTIONS unless index.dispatch_candidate?(name)

  collect_gated_contributions(index, relevant, name, call_node, scope, receiver_type)
end

.constant_constructor_lift(class_name, arg_types) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 985

def constant_constructor_lift(class_name, arg_types)
  builder = CONSTANT_CONSTRUCTORS[class_name]
  return nil if builder.nil?
  return nil unless arg_types.size == 1

  arg = arg_types.first
  return nil unless arg.is_a?(Type::Constant) && arg.value.is_a?(String)

  result = builder.call(arg.value)
  Type::Combinator.constant_of(result)
rescue StandardError
  nil
end

.constant_metaclass(value) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1166

def constant_metaclass(value)
  CONSTANT_METACLASSES.each do |klass, name|
    return Type::Combinator.singleton_of(name) if value.is_a?(klass)
  end
  nil
end

.date_new_lift(class_name, arg_types) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1144

def date_new_lift(class_name, arg_types)
  return nil unless DATE_NEW_CLASSES.include?(class_name)
  return nil unless arg_types.size.between?(1, 8)
  return nil unless arg_types.all?(Type::Constant)

  values = arg_types.map(&:value)
  return nil unless values.all? { |v| v.is_a?(Integer) || v.is_a?(Rational) || v.is_a?(String) }

  klass = class_name == "Date" ? Date : DateTime
  Type::Combinator.constant_of(klass.new(*values))
rescue StandardError
  nil
end

.dep_source_class_name(receiver_type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 644

def dep_source_class_name(receiver_type)
  case receiver_type
  when Type::Nominal, Type::Singleton then receiver_type.class_name
  end
end

.dependency_source_return_type(contribution) ⇒ Object

Maps a DependencySourceInference::Walker::CatalogEntry to the Type the dispatcher returns at the call site. When the heuristic recovered a static facet, wrap it in Dynamic[T] per ADR-10's gem-boundary contract; otherwise fall back to the pre-heuristic Dynamic[top].



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# File 'lib/rigor/inference/method_dispatcher.rb', line 594

def dependency_source_return_type(contribution)
  return Type::Combinator.untyped if contribution.return_type.nil?

  Type::Combinator.dynamic(contribution.return_type)
end

.discovered_method_lookup(receiver_type) ⇒ Object

Resolves the (class_name, kind) pair scope_indexer keys its discovered_methods table on. Nominal[X] looks up instance methods on X; Singleton[X] looks up singleton methods on X. Other carriers return [nil, nil] so the tier declines.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 306

def discovered_method_lookup(receiver_type)
  case receiver_type
  when Type::Nominal then [receiver_type.class_name, :instance]
  when Type::Singleton then [receiver_type.class_name, :singleton]
  else [nil, nil]
  end
end

.dispatch(receiver_type:, method_name:, arg_types:, block_type: nil, environment: nil, call_node: nil, scope: nil) ⇒ Rigor::Type?

Returns inferred result type, or nil for "no rule".

Parameters:

  • receiver_type (Rigor::Type, nil) —

    type of the receiver expression, or nil for an implicit-self call.

  • method_name (Symbol)
  • arg_types (Array<Rigor::Type>) —

    positional argument types.

  • block_type (Rigor::Type, nil) (defaults to: nil) —

    inferred return type of the accompanying do ... end / { ... } block (Slice 6 phase C sub-phase 2). When non-nil, the dispatcher prefers an overload that declares a block, and binds the method's block-return type variable to block_type so a return type like Array[U] resolves to Array[block_type].

  • environment (Rigor::Environment, nil) (defaults to: nil) —

    required for RBS-backed dispatch; when nil only constant folding can fire.

Returns:

  • (Rigor::Type, nil) —

    inferred result type, or nil for "no rule".



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# File 'lib/rigor/inference/method_dispatcher.rb', line 66

def dispatch(receiver_type:, method_name:, arg_types:,
             block_type: nil, environment: nil,
             call_node: nil, scope: nil)
  result = resolve(
    receiver_type: receiver_type, method_name: method_name, arg_types: arg_types,
    block_type: block_type, environment: environment,
    call_node: call_node, scope: scope
  )
  # ADR-100 WD4 — the transitive-void consult, HERE in the wrapper rather than in any result
  # tier: which tier answers the intermediate's call depends on where the leaf's RBS came from
  # (`RbsDispatch` on the ADR-93 synthesized `untyped` skeleton, or the post-dispatch
  # `ExpressionTyper` body-inference tiers on a partial hand-written `sig/`), and both answers
  # are correct types that must not change. Recording is therefore result-independent and
  # type-blind; a statement-position record stays inert because the collector only reads value
  # positions.
  record_transitive_void_origin(receiver_type, method_name, call_node, scope)
  # `rigor trace` — record the dispatch outcome (resolved type, or the fail-soft `nil` the
  # caller widens to `Dynamic[Top]`).
  if FlowTracer.active?
    FlowTracer.dispatch(
      receiver: receiver_type, method_name: method_name, args: arg_types,
      result: result, location: call_node&.location
    )
  end
  result
end

.dispatch_kernel_intrinsic(context) ⇒ Object

ADR-91 WD1 — the single dispatcher-held ownership gate for the Kernel module-function surface (gate-by-held-key, the same move STDLIB_SINGLETON_FOLDERS made above). The tier runs only when the method name is in the compiled INTRINSIC_NAMES table AND the call is attributable to Kernel itself (implicit self / Kernel. receiver, no discovered user redefinition). Because the gate lives HERE and nowhere else, a fold inside KernelDispatch that "forgets" its ownership guard is unrepresentable — the whole tier is unreachable for a foreign receiver. Unit probes calling KernelDispatch.try_dispatch directly keep the caller-vouches-for-ownership contract.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 794

def dispatch_kernel_intrinsic(context)
  return nil unless KernelDispatch::INTRINSIC_NAMES.include?(context.method_name)
  return nil unless KernelDispatch.kernel_owned_call?(context)

  KernelDispatch.try_dispatch(context)
end

.dispatch_precise_tiers(context) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 747

def dispatch_precise_tiers(context)
  # ADR-48 — Data value folding runs ahead of meta-introspection: `meta_new` intercepts
  # every `Singleton[*].new` (returning `Nominal`), which would mask a `Data` class's
  # precise instance. The tier only fires on Data receivers (a `Data.define`, a
  # `DataClass`/`DataInstance`, or a `Singleton` with a recorded member layout), so it
  # never shadows meta's Array/Set/Range lifts.
  data_result = DataFolding.try_dispatch(context)
  return data_result if data_result

  # ADR-48 Struct follow-up — runs in the same band and for the same reason as DataFolding:
  # `meta_new` would otherwise intercept every `Singleton[*].new` (the old
  # `struct_new_lift` produced a bare `Singleton[Struct]`), masking a Struct class's
  # precise instance. Only fires on Struct receivers, so it never shadows meta's lifts.
  struct_result = StructFolding.try_dispatch(context)
  return struct_result if struct_result

  meta_result = try_meta_introspection(context.receiver, context.method_name, context.args)
  return meta_result if meta_result

  PRECISE_TIERS_HEAD.each do |tier|
    result = tier.try_dispatch(context)
    return result if result
  end

  receiver = context.receiver
  if receiver.is_a?(Type::Singleton) && (folder = STDLIB_SINGLETON_FOLDERS[receiver.class_name])
    result = folder.try_dispatch(context)
    return result if result
  end

  kernel_result = dispatch_kernel_intrinsic(context)
  return kernel_result if kernel_result

  PRECISE_TIERS_TAIL.each do |tier|
    result = tier.try_dispatch(context)
    return result if result
  end
  nil
end

.expected_block_param_types(receiver_type:, method_name:, arg_types:, environment: nil) ⇒ Array<Rigor::Type>

Returns the positional block parameter types declared by the receiving method's selected RBS overload, translated into Rigor::Type. Used by the StatementEvaluator's CallNode handler to bind block parameter names before evaluating the block body.

The probe is best-effort: it returns an empty array whenever the receiver, environment, method definition, or selected overload does not provide statically declared block parameter types. Callers MUST treat the empty array as "no information"; the binder falls back to Dynamic[Top] for every parameter slot in that case.

Parameters:

Returns:



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1187

def expected_block_param_types(receiver_type:, method_name:, arg_types:, environment: nil)
  return [] if receiver_type.nil?

  context = CallContext.build(
    receiver: receiver_type, method_name: method_name,
    args: arg_types, environment: environment
  )
  iterator_result = IteratorDispatch.block_param_types(context)
  return iterator_result if iterator_result

  RbsDispatch.block_param_types(context)
end

.explicit_non_self_receiver?(call_node) ⇒ Boolean

True when the call node carries an explicit receiver that is not the literal self. Such a call cannot legally dispatch to a private method, so the user-class fallback must skip private signatures rather than return a confidently-wrong type. Returns false for implicit-self calls and self.-receiver calls (both may legally reach a private method in modern Ruby), and false when no call_node is supplied (internal dispatcher callers).

Returns:

  • (Boolean) 


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# File 'lib/rigor/inference/method_dispatcher.rb', line 835

def explicit_non_self_receiver?(call_node)
  return false if call_node.nil?
  return false unless call_node.respond_to?(:receiver)

  receiver = call_node.receiver
  return false if receiver.nil?

  !receiver.is_a?(Prism::SelfNode)
end

.hash_new_lift(class_name, arg_types) ⇒ Object

Hash.new(default) — lifts the default value's type into the Hash's value parameter so a subsequent h[k] read surfaces the default type rather than Dynamic[top]. The common counter idiom h = Hash.new(0); h[k] += 1 then types the read as Integer. The key parameter is left untyped (the default carrier imposes no key constraint), so reads of any key resolve through the value parameter. A value-pinned Constant default (0) is widened to its nominal (Integer): the hash's values mutate over its lifetime, so pinning the parameter to the literal would be unsound for the aggregate.

Only the single-argument default form folds. The zero-arg (Hash.new) and the block form (Hash.new { |h, k| … }) keep the bare Nominal[Hash] answer — the block's value type is not available at this :new dispatch site, and conservatively leaving the read as today's behaviour is precision-additive.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1041

def hash_new_lift(class_name, arg_types)
  return nil unless class_name == "Hash"
  return nil unless arg_types.size == 1

  default = arg_types.first
  return nil if default.nil?

  value = Type::Combinator.widen_value_pinned(default)
  Type::Combinator.nominal_of("Hash", type_args: [Type::Combinator.untyped, value])
end

.meta_class(receiver_type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 878

def meta_class(receiver_type)
  case receiver_type
  when Type::Nominal then Type::Combinator.singleton_of(receiver_type.class_name)
  when Type::Constant then constant_metaclass(receiver_type.value)
  end
end

.meta_new(receiver_type, arg_types = []) ⇒ Object

Singleton[Foo].new returns Nominal[Foo] (a fresh instance), regardless of whether Foo is in RBS. This short-circuits the Class.new generic-instance plumbing for user classes, so a discovered-class ScanAccumulator.new types as Nominal[ScanAccumulator] rather than Class.

v0.0.7 — for the curated set of immutable scalar-shaped classes that Type::Constant::SCALAR_CLASSES accepts (today: Pathname), .new(Constant<…>) lifts to a Constant<…> carrier so downstream method calls fold through the standard catalog tier.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 894

def meta_new(receiver_type, arg_types = [])
  return nil unless receiver_type.is_a?(Type::Singleton)

  constant_lift = constant_constructor_lift(receiver_type.class_name, arg_types)
  return constant_lift if constant_lift

  array_lift = array_new_lift(receiver_type.class_name, arg_types)
  return array_lift if array_lift

  range_lift = range_new_lift(receiver_type.class_name, arg_types)
  return range_lift if range_lift

  set_lift = set_new_lift(receiver_type.class_name, arg_types)
  return set_lift if set_lift

  hash_lift = hash_new_lift(receiver_type.class_name, arg_types)
  return hash_lift if hash_lift

  regexp_lift = regexp_new_lift(receiver_type.class_name, arg_types)
  return regexp_lift if regexp_lift

  date_lift = date_new_lift(receiver_type.class_name, arg_types)
  return date_lift if date_lift

  struct_new_lift = struct_new_lift(receiver_type.class_name, arg_types)
  return struct_new_lift if struct_new_lift

  class_new_lift = class_new_lift(receiver_type.class_name, arg_types)
  return class_new_lift if class_new_lift

  Type::Combinator.nominal_of(receiver_type.class_name)
end

.plugin_owns_receiver?(class_name, environment) ⇒ Boolean

ADR-52 WD1 — the per-dispatch plugins × owns_receivers × class_ordering walk moved into the compiled contribution table: the union is built once per registry (almost always empty → O(1) false) and per-class verdicts memoise per run.

Returns:

  • (Boolean) 


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# File 'lib/rigor/inference/method_dispatcher.rb', line 637

def plugin_owns_receiver?(class_name, environment)
  registry = environment&.plugin_registry
  return false if registry.nil? || registry.empty?

  registry.contribution_index.owns_receiver?(class_name, environment)
end

.promote_synthetic_match(matches, method_name, arg_types, block_type, environment) ⇒ Object

First non-nil promotion wins. Tier B (origin_module) and Tier C (return_type nominal lookup) are tried in the same registration-order pass per WD11 first-wins — the slice-3b scanner sets origin_module for Tier B entries and leaves it absent for Tier C, so the two paths self-route per match.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 457

def promote_synthetic_match(matches, method_name, arg_types, block_type, environment)
  return nil if environment.nil?

  matches.each do |synthetic|
    promoted =
      promote_via_origin_module(synthetic, method_name, arg_types, block_type, environment) ||
      promote_via_return_type(synthetic, environment)
    return promoted if promoted
  end
  nil
end

.promote_via_origin_module(synthetic, method_name, arg_types, block_type, environment) ⇒ Object

Slice 6a-TierB. For Tier B emissions (origin_module recorded in provenance), redispatch the call on the included module's Nominal[...] type via RbsDispatch. Returns nil when the SyntheticMethod is not a Tier B entry or when the origin_module is not in the RBS env.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 473

def promote_via_origin_module(synthetic, method_name, arg_types, block_type, environment)
  module_name = synthetic.provenance[:origin_module]
  return nil unless module_name

  module_type = Type::Combinator.nominal_of(module_name)
  RbsDispatch.try_dispatch(
    CallContext.build(
      receiver: module_type, method_name: method_name, args: arg_types,
      environment: environment, block_type: block_type
    )
  )
end

.promote_via_return_type(synthetic, environment) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 494

def promote_via_return_type(synthetic, environment)
  return_type = synthetic.return_type
  return nil if return_type.nil? || TIER_C_PLACEHOLDER_RETURNS.include?(return_type)

  environment.nominal_for_name(return_type)
end

.range_new_excl(excl_type) ⇒ Object

Resolves the optional exclude_end argument for range_new_lift. Returns false (no arg), true/false (Constant arg), or nil to signal "decline" (wrong type / wrong value class).



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1084

def range_new_excl(excl_type)
  case excl_type
  when nil then false
  when Type::Constant
    excl_type.value if [true, false].include?(excl_type.value)
  end
end

.range_new_lift(class_name, arg_types) ⇒ Object

Range.new(b, e) / Range.new(b, e, excl) — folds to Constant[Range] when both endpoints are Constant[Integer] or both are Constant[String], and the optional third argument is a Constant[true/false]. Nil endpoints (beginless / endless ranges) are not folded because the useful instance methods (to_a, first, last) are not defined for them; the RBS tier answers Nominal[Range] for those forms.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1057

def range_new_lift(class_name, arg_types)
  return nil unless class_name == "Range"
  return nil if arg_types.size < 2 || arg_types.size > 3

  b_type = arg_types[0]
  e_type = arg_types[1]

  return nil unless b_type.is_a?(Type::Constant) && e_type.is_a?(Type::Constant)

  b_val = b_type.value
  e_val = e_type.value

  # Only fold homogeneous Integer or String endpoint pairs.
  return nil unless b_val.instance_of?(e_val.class)
  return nil unless b_val.is_a?(Integer) || b_val.is_a?(String)

  excl = range_new_excl(arg_types[2])
  return nil if excl.nil?

  Type::Combinator.constant_of(Range.new(b_val, e_val, excl))
rescue StandardError
  nil
end

.rbs_display_for(rbs_result) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 618

def rbs_display_for(rbs_result)
  return "untyped" if rbs_result.nil?

  rbs_result.respond_to?(:describe) ? rbs_result.describe : rbs_result.inspect
end

.rbs_result_untyped?(rbs_result) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rigor/inference/method_dispatcher.rb', line 614

def rbs_result_untyped?(rbs_result)
  rbs_result.is_a?(Type::Dynamic) && rbs_result.static_facet.is_a?(Type::Top)
end

.record_boundary_cross_if_applicable(receiver_type, method_name, rbs_result, environment) ⇒ Object

ADR-10 slice 5c — record a dynamic.dependency-source.boundary-cross event when RBS dispatch resolves a call AND the receiver class belongs to a mode: :full opt-in gem whose Walker also catalogued the same (class_name, method_name). The dispatcher still returns the RBS answer (per ADR-10's tier order: authoritative-source wins), but the reporter accumulates the crossing for end-of-run audit diagnostics.

Five honest fall-throughs keep the gate narrow:

  • environment / index / reporter missing — slice 5c needs all three.
  • receiver has no nominal class name (Dynamic-only carriers) — nothing to look up.
  • receiver class doesn't belong to a mode: :full gem — the user didn't opt this gem into the distinct dispatch path.
  • the gem-source catalog has no entry for the method — only RBS knows about it; nothing to cross.
  • the RBS-side result is itself Dynamic[Top] — the "agreement" is trivially untyped ≈ untyped, no meaningful divergence to flag.


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# File 'lib/rigor/inference/method_dispatcher.rb', line 575

def record_boundary_cross_if_applicable(receiver_type, method_name, rbs_result, environment)
  class_name = boundary_cross_class_name(receiver_type, environment, rbs_result)
  return if class_name.nil?

  index = environment.dependency_source_index
  return unless index.full_mode?(class_name)
  return unless index.contribution_for(class_name: class_name, method_name: method_name)

  environment.boundary_cross_reporter.record(
    class_name: class_name, method_name: method_name,
    gem_name: index.gem_for(class_name),
    rbs_display: rbs_display_for(rbs_result)
  )
end

.record_transitive_void_origin(receiver_type, method_name, call_node, scope) ⇒ Object

ADR-100 WD4 — records the transitive -> void provenance when the called method is a discovered project def whose VoidTailSummary chain ends in an author-declared -> void leaf on the same owner. Guards cheapest-first: the internal dispatcher callers nil scope / call_node out; the receiver must project through #discovered_method_lookup (Nominal / Singleton only — unions and Dynamic receivers stay out); and the discovered_method? pre-filter (two pure hash reads) keeps the hot path at ~zero cost — only a call that provably targets a discovered def of the right kind resolves the node and consults the summary. The Prism::CallNode guard mirrors collect_plugin_contributions: the &:symbol block path dispatches with the Prism::BlockArgumentNode itself, which is never a collector value position, so recording on it would be dead weight.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 247

def record_transitive_void_origin(receiver_type, method_name, call_node, scope)
  return if scope.nil? || call_node.nil?
  return unless call_node.is_a?(Prism::CallNode)

  class_name, kind = discovered_method_lookup(receiver_type)
  return if class_name.nil?
  return unless scope.discovered_method?(class_name, method_name, kind)

  def_node =
    if kind == :singleton
      scope.singleton_def_for(class_name, method_name)
    else
      scope.user_def_for(class_name, method_name)
    end
  return if def_node.nil?

  origin = VoidTailSummary.new(scope).origin_for(def_node, class_name, kind)
  scope.record_void_origin(call_node, origin) if origin
end

.regexp_new_lift(class_name, arg_types) ⇒ Object

Regexp.new(pattern) / Regexp.new(pattern, opts) — folds to Constant[Regexp] when the pattern is a Constant[String]. Mirrors RegexpFolding#fold_new but lives here so the :new path in try_meta_introspection can reach it.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1114

def regexp_new_lift(class_name, arg_types)
  return nil unless class_name == "Regexp"
  return nil if arg_types.empty? || arg_types.size > 2

  pattern_arg = arg_types.first
  return nil unless pattern_arg.is_a?(Type::Constant) && pattern_arg.value.is_a?(String)

  opts = if arg_types.size == 2
           opt_type = arg_types[1]
           return nil unless opt_type.is_a?(Type::Constant)

           opt_type.value
         else
           0
         end

  Type::Combinator.constant_of(Regexp.new(pattern_arg.value, opts))
rescue StandardError
  nil
end

.resolve(receiver_type:, method_name:, arg_types:, block_type: nil, environment: nil, call_node: nil, scope: nil) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/MethodLength, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity



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# File 'lib/rigor/inference/method_dispatcher.rb', line 93

def resolve(receiver_type:, method_name:, arg_types:, # rubocop:disable Metrics/AbcSize, Metrics/MethodLength, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
            block_type: nil, environment: nil,
            call_node: nil, scope: nil)
  return nil if receiver_type.nil?

  # Build the call context once and thread it — unchanged — through every tier
  # (`_DispatchTier#try_dispatch`). The dispatcher's own private fallback tiers still read
  # the positional locals below; only the tier modules consume the context object.
  context = CallContext.build(
    receiver: receiver_type, method_name: method_name, args: arg_types,
    block_type: block_type, environment: environment,
    call_node: call_node, scope: scope
  )

  bound_method_result = MethodFolding.try_backward(context)
  return bound_method_result if bound_method_result

  precise = dispatch_precise_tiers(context)
  return precise if precise

  # v0.1.1 Track 2 slice 7 — plugin return-type contribution tier. Sits ahead of
  # `RbsDispatch` so a plugin that understands a domain-specific dispatch (e.g. an
  # `ActiveRecord::Base.find` returning `Nominal[<resolved model>]`) wins over the
  # RBS-projected envelope. Only consults the registry when both `call_node` and `scope`
  # are supplied — the dispatcher's own internal callers (per-element block fold, etc.)
  # skip this tier.
  plugin_result = try_plugin_contribution(call_node, scope, receiver_type)
  if plugin_result
    if plugin_result.is_a?(Type::Dynamic)
      scope&.record_dynamic_origin(call_node, DynamicOrigin::FRAMEWORK_DSL_BOUNDARY)
    end
    return plugin_result
  end

  # ADR-20 slice 3 — Rigor-bundled HKT-builtin return-type tier. Sits ABOVE
  # `RbsDispatch.try_dispatch` so the handful of stdlib methods whose upstream RBS
  # signature is `untyped` but whose runtime shape Rigor models via a Lightweight HKT
  # (`json::value`, eventually `dry_monads::result`, …) get the reduced type instead of
  # `Dynamic[Top]`. The table that populates this tier lives in
  # `Rigor::Builtins::HktBuiltins::METHOD_RETURN_OVERRIDES`; plugin-supplied per-method
  # overrides are out of scope for slice 3 and continue to flow through the
  # `try_plugin_contribution` tier above.
  hkt_builtin_result = try_hkt_builtin_return(receiver_type, method_name, arg_types, environment)
  return hkt_builtin_result if hkt_builtin_result

  # Rigor-bundled static refinement tier. Sits between HKT and RBS so stdlib methods whose
  # upstream RBS is broader than the documented behaviour (e.g. `Kernel#__dir__` declared
  # `() -> String?` when the documented return is `non-empty-string | nil`) get the
  # tightened type without modifying the vendored `ruby/rbs` submodule. The override table
  # lives in `Rigor::Builtins::StaticReturnRefinements::OVERRIDES`.
  static_refinement = try_static_refinement(receiver_type, method_name, arg_types)
  return static_refinement if static_refinement

  rbs_result = RbsDispatch.try_dispatch(context)
  if rbs_result
    record_boundary_cross_if_applicable(receiver_type, method_name, rbs_result, environment)
    if rbs_result.is_a?(Type::Dynamic) && rbs_result.static_facet.is_a?(Type::Top)
      scope&.record_dynamic_origin(call_node, DynamicOrigin::EXPLICIT_UNTYPED)
    end
    return rbs_result
  end

  # ADR-16 Tier B / Tier C — synthetic-method tier. Sits BELOW RBS dispatch (per WD13:
  # user-authored RBS overrides substrate synthesis) and ABOVE the dependency-source
  # inference tier so a plugin's declared emit table beats the generic gem-source fallback
  # for the same class. Slice 6a-TierB (origin_module dispatch) lands precise return types
  # for Tier B emissions; Tier C emissions still return `Dynamic[T]` at this tier (slice 6b
  # is the Tier C promotion via ADR-13's resolver chain).
  synthetic_result = try_synthetic_method(
    receiver_type, method_name, arg_types, block_type, environment
  )
  return synthetic_result if synthetic_result

  # ADR-17 slice 2 — project-side patched-method tier. Sits BELOW the substrate / plugin
  # tiers and ABOVE dependency-source inference per ADR-17 § "Inference contract". When
  # the user's `pre_eval:` list named a file that re-opens a class (e.g.,
  # `lib/core_ext/string_extensions.rb` declaring `class String; def to_url; end; end`),
  # the pre-pass populated `ProjectPatchedMethods` with the `(class, method, kind)` triple;
  # this tier surfaces it as `Dynamic[top]` so the patched call resolves cross-file without
  # `call.undefined-method`.
  patched_result = try_project_patched_method(receiver_type, method_name, environment)
  if patched_result
    scope&.record_dynamic_origin(call_node, DynamicOrigin::EXTERNAL_GEM_WITHOUT_RBS)
    return patched_result
  end

  # ADR-10 slice 2b-ii — dependency-source inference tier. Sits BELOW RBS dispatch (RBS /
  # RBS::Inline / generated stubs / plugin contracts always win) and ABOVE the user-class
  # fallback so a method defined in an opt-in gem stops emitting `call.undefined-method`
  # even when no signature contract resolves. Returns `Dynamic[top]` — slice 2b-ii
  # deliberately stops at the dynamic-origin envelope; per-method return-type precision is
  # queued for a later slice.
  dep_source_result = try_dependency_source(receiver_type, method_name, environment)
  if dep_source_result
    scope&.record_dynamic_origin(call_node, DynamicOrigin::EXTERNAL_GEM_WITHOUT_RBS)
    return dep_source_result
  end

  # v0.1.3 — discovered-method dispatch tier. When the receiver class has no RBS BUT
  # scope_indexer recorded `def method_name` for that class (or singleton), the call
  # dispatches to `Dynamic[top]` rather than falling through to the user-class fallback.
  # Sits below RBS / dependency-source so authoritative signatures still win. The
  # scope-indexer-built table records every project-side `def`, `define_method`, and
  # `alias_method`; the `discovered_method?` consult here closes the fail-soft-event hot
  # spot on implicit-self calls (`sibling_private(...)`) inside `lib/rigor/`'s own
  # internals (analyser private helpers don't have RBS).
  discovered_result = try_discovered_method(receiver_type, method_name, scope)
  if discovered_result
    # ADR-82 WD2/WD3 — the call resolved to a discovered user method but its return could not be
    # inferred (bare `def`, untyped-parameter chain). Record it as an inference gap, not the
    # generic `unsupported_syntax`, so `coverage --protection` routes it to ADR-58/67.
    if discovered_result.is_a?(Type::Dynamic)
      scope&.record_dynamic_origin(call_node, DynamicOrigin::INFERRED_RETURN_UNTYPED)
    end
    return discovered_result
  end

  # ADR-5 robustness — synthesized-stub-type tier. When the receiver is a type Rigor
  # invented to make an otherwise-unbuildable project signature resolve (a
  # missing-namespace module, or a stub for a referenced-but-undeclared type like an
  # unavailable `DRb::DRbServer`), the stub carries no methods, so an unresolved call
  # against it would otherwise mis-fire `call.undefined-method`. Resolve it to
  # `Dynamic[Top]` instead — the same no-false-positive contract as the dependency-source
  # tier. Sits below every real resolution tier so a genuine signature always wins.
  stub_result = try_synthesized_stub_type(receiver_type, environment)
  return stub_result if stub_result

  # Slice 7 phase 10 — user-class ancestor fallback. When the receiver is `Nominal[T]` or
  # `Singleton[T]` for a class not in the RBS environment (typically a user-defined class),
  # retry the dispatch against the implicit ancestor: `Nominal[Object]` for instance
  # receivers and `Singleton[Object]` for singleton receivers. This resolves Kernel
  # intrinsics (`require`, `raise`, `puts`, ...) and Module/Class introspection
  # (`attr_reader`, `private`, ...) on user classes without requiring the user to author
  # their own RBS.
  fallback_result = try_user_class_fallback(receiver_type, environment, call_node, context)
  # ADR-82 WD2/WD3 — a user-class receiver whose call resolved to the lenient ancestor fallback
  # with no inferable return. Same inference-gap provenance as the discovered-method tier, so a
  # downstream dispatch on this value is labeled honestly rather than `unsupported_syntax`.
  if fallback_result.is_a?(Type::Dynamic)
    scope&.record_dynamic_origin(call_node, DynamicOrigin::INFERRED_RETURN_UNTYPED)
  end
  fallback_result
end

.set_new_lift(class_name, arg_types) ⇒ Object

Set.new / Set.new(tuple_of_constants) — folds to Constant[Set] when zero arguments are given or the single argument is a Tuple whose every element is a Constant[T]. Mirrors SetFolding#fold_new but lives here so the :new path in try_meta_introspection can reach it before the RBS tier answers Nominal[Set].



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# File 'lib/rigor/inference/method_dispatcher.rb', line 1096

def set_new_lift(class_name, arg_types)
  return nil unless class_name == "Set"
  return Type::Combinator.constant_of(::Set.new) if arg_types.empty?
  return nil if arg_types.size > 1

  arg = arg_types.first
  return nil unless arg.is_a?(Type::Tuple)
  return nil unless arg.elements.all?(Type::Constant)

  values = arg.elements.map(&:value)
  Type::Combinator.constant_of(::Set.new(values))
rescue StandardError
  nil
end

.static_refinement_class_for(receiver_type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 395

def static_refinement_class_for(receiver_type)
  case receiver_type
  when Type::Singleton, Type::Nominal
    receiver_type.class_name
  end
end

.static_refinement_owner_for(receiver_type, candidates) ⇒ Object

Picks the most specific override owner the receiver honours. For Kernel-owned overrides the receiver simply needs to be a real-class Nominal / Singleton (i.e. not BasicObject and not a Dynamic / Constant / shape carrier — those carriers go through their own narrower tiers).



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# File 'lib/rigor/inference/method_dispatcher.rb', line 386

def static_refinement_owner_for(receiver_type, candidates)
  receiver_class = static_refinement_class_for(receiver_type)
  return nil unless receiver_class

  return "Kernel" if candidates.include?("Kernel") && receiver_class != "BasicObject"

  candidates.find { |owner| owner == receiver_class }
end

.struct_new_lift(class_name, arg_types) ⇒ Object

Struct.new(:a, :b) synthesises an anonymous Struct subclass (a class object), not a Struct instance — so the chained idiom Struct.new(:a, :b).new(1, 2) must resolve .new again on a class-like carrier. The constant-bound form (S = Struct.new(:a); S.new(1)) already records Singleton[S] via ScopeIndexer#record_meta_new_constant?; this lift gives the chained (anonymous) position the same class-like carrier so the trailing .new dispatches instead of firing a spurious undefined method 'new' for Struct.

The disambiguation mirrors ScopeIndexer#struct_new_call?: a call whose positionals are all Constant<Symbol> literals is a member-list class definition → Singleton[Struct]. The following AnonStruct.new(1, 2) carries non-symbol args, so it falls through this gate to Nominal[Struct] (a fresh instance) via the meta_new tail. ADR-48 deferred full Struct value folding (member-reader precision) on mutability grounds; this is the narrower .new-dispatch-only fix and contributes no member layout, so instance.a stays at its RBS/Dynamic type.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 942

def struct_new_lift(class_name, arg_types)
  return nil unless class_name == "Struct"

  positional = arg_types.grep_v(Type::HashShape)
  return nil if positional.empty?
  return nil unless positional.all? { |t| t.is_a?(Type::Constant) && t.value.is_a?(Symbol) }

  Type::Combinator.singleton_of("Struct")
end

.synthetic_method_class_name(receiver_type) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 501

def synthetic_method_class_name(receiver_type)
  case receiver_type
  when Type::Nominal, Type::Singleton then receiver_type.class_name
  end
end

.try_dependency_source(receiver_type, method_name, environment) ⇒ Object

ADR-10 slice 2b-ii. Consults the per-run Analysis::DependencySourceInference::Index carried by the environment for (class_name, method_name) observations harvested from opt-in gems' roots:. On a hit, returns Combinator.untyped so the call site carries the Dynamic[top] provenance (per ADR-10's "Inference contract": gem-source-inferred shapes never publish as ground-truth T). Returns nil when the environment carries no index, the index has no entry, or the receiver has no nominal class to look up.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 534

def try_dependency_source(receiver_type, method_name, environment)
  index = environment&.dependency_source_index
  return nil if index.nil? || index.empty?

  class_name = dep_source_class_name(receiver_type)
  return nil if class_name.nil?

  # ADR-10 5a — per-receiver plugin veto. When a registered plugin declares
  # `manifest(owns_receivers: [<class>])` AND the call's receiver IS that class (or a
  # subclass), decline and let plugins handle the call. Plugins that own a receiver are
  # the authoritative source for that type; gem-source inference must not contribute
  # behind their backs.
  return nil if plugin_owns_receiver?(class_name, environment)

  contribution = index.contribution_for(class_name: class_name, method_name: method_name)
  return dependency_source_return_type(contribution) if contribution

  # ADR-10 5b — β budget semantics. On a catalog miss, if the receiver class belongs to a
  # budget-exceeded gem AND the user opted into `:dependency_silence`, return
  # `Dynamic[top]` rather than falling through to the user-class fallback. The user-class
  # fallback would otherwise emit `call.undefined-method` for methods Rigor's catalog
  # couldn't reach because the walker hit its cap.
  budget_silence_result(class_name, index, environment)
end

.try_discovered_method(receiver_type, method_name, scope) ⇒ Object

v0.1.3 — discovered-method dispatch tier. scope carries the discovered_methods table built once per program by ScopeIndexer (a Hash[String, Hash[Symbol, :instance | :singleton]]). When the receiver names a discovered class AND the requested method is recorded for that class's appropriate kind, return Type::Combinator.untyped — the dispatcher cannot infer a more precise return type from the bare def shape, but the call site stops being a fail-soft hot spot.

Returns nil when scope / receiver class is unavailable, when the method is not in the discovered table, OR when discovered_def_nodes carries a re-typable body for the method (so the downstream ExpressionTyper#try_user_method_inference tier can re-type the body for a precise return type rather than collapsing to Dynamic[top] here).

The tier does NOT gate on rbs_class_known?. RBS dispatch already had its turn upstream and returned nil (otherwise we wouldn't be here). When RBS knows the class but the particular method is missing from the sig — common for internal helpers and for auto-generated stubs that emit class X without enumerating every method — falling through to the user-class fallback would mistakenly fire call.undefined-method. Honoring the discovered table here keeps the sibling-private call resolution working under partial RBS coverage.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 286

def try_discovered_method(receiver_type, method_name, scope)
  return nil if scope.nil?

  class_name, kind = discovered_method_lookup(receiver_type)
  return nil if class_name.nil?
  return nil unless scope.discovered_method?(class_name, method_name, kind)
  # Decline when a re-typable body is recorded for the method, so the downstream
  # `ExpressionTyper` inference tier can fold a precise return instead of collapsing to
  # `Dynamic[top]` here — instance bodies via `user_def_for`, singleton bodies (`def
  # self.x` / `module_function`) via `singleton_def_for` (module-singleton call
  # resolution, ADR-57 follow-up).
  return nil if kind == :instance && scope.user_def_for(class_name, method_name)
  return nil if kind == :singleton && scope.singleton_def_for(class_name, method_name)

  Type::Combinator.untyped
end

.try_hkt_builtin_return(receiver_type, method_name, arg_types, environment) ⇒ Object

ADR-20 slice 3 — looks up the receiver / method pair in Builtins::HktBuiltins::METHOD_RETURN_OVERRIDES and returns the reduced HKT type. Only fires when the receiver is a Type::Singleton (the JSON.parse shape) and the registry-backed reduction succeeds; returns nil otherwise so the dispatcher falls through to RBS.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 342

def try_hkt_builtin_return(receiver_type, method_name, arg_types, environment)
  return nil if environment.nil?
  return nil unless receiver_type.is_a?(Type::Singleton)

  Rigor::Builtins::HktBuiltins.method_return_override(
    class_name: receiver_type.class_name,
    method_name: method_name,
    kind: :singleton,
    arg_types: arg_types,
    hkt_registry: environment.hkt_registry
  )
end

.try_meta_introspection(receiver_type, method_name, arg_types = []) ⇒ Object

Slice 7 phase 8 — meta-introspection shortcuts. The default Object#class RBS return type is Class, but for a receiver of known nominal identity we can do better: instance_of(Foo).class is Singleton[Foo] (the class object itself), which downstream dispatch uses to resolve self.class.some_class_method. The same logic answers Foo.class as Singleton[Class] (deliberate; calling .class on a class object yields Class, the metaclass). We also special-case is_a?-adjacent calls and the trivial instance_of?(self) later as the rule catalogue grows; for now only class is handled.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 871

def try_meta_introspection(receiver_type, method_name, arg_types = [])
  case method_name
  when :class then meta_class(receiver_type)
  when :new then meta_new(receiver_type, arg_types)
  end
end

.try_plugin_contribution(call_node, scope, receiver_type) ⇒ Object

ADR-2 § "Flow Contribution Bundle" / v0.1.1 Track 2 slice 7; ADR-52 WD3 — consults each loaded plugin's gated dynamic_return rules, wraps the contributed types as FlowContribution bundles, merges them through FlowContribution::Merger, and returns the merged return_type slot (or nil when no plugin contributed a return type).

Plugins whose hook raises have their contribution silently dropped for this call so the dispatch chain keeps moving — the run-level diagnostic envelope (per ADR-2 § "Plugin Trust and I/O Policy") is owned by Analysis::Runner#plugin_emitted_diagnostics.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 410

def try_plugin_contribution(call_node, scope, receiver_type)
  return nil if call_node.nil? || scope.nil?

  registry = scope.environment&.plugin_registry
  return nil if registry.nil? || registry.empty?

  contributions = collect_plugin_contributions(registry, call_node, scope, receiver_type)
  return nil if contributions.empty?

  FlowContribution::Merger.merge(contributions).return_type
end

.try_project_patched_method(receiver_type, method_name, environment) ⇒ Object

ADR-17 slice 2 — project-side patched-method tier. Slice 3a uses the registry's heuristic-extracted return_type (populated via the same Analysis::DependencySourceInference::ReturnTypeHeuristic the ADR-10 walker uses): a def to_url; "hello"; end patched onto String now resolves s.to_url to Dynamic[Nominal[String]] instead of the pre-3a Dynamic[Top]. Falls back to Dynamic[Top] when the heuristic declined (non-literal tail expression).



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# File 'lib/rigor/inference/method_dispatcher.rb', line 513

def try_project_patched_method(receiver_type, method_name, environment)
  registry = environment&.project_patched_methods
  return nil if registry.nil? || registry.empty?

  class_name = synthetic_method_class_name(receiver_type)
  return nil if class_name.nil?

  kind = receiver_type.is_a?(Type::Singleton) ? :singleton : :instance
  entry = registry.lookup(class_name: class_name, method_name: method_name, kind: kind)
  return nil if entry.nil?
  return Type::Combinator.untyped if entry.return_type.nil?

  Type::Combinator.dynamic(entry.return_type)
end

.try_static_refinement(receiver_type, method_name, arg_types) ⇒ Object

Consults the Rigor-bundled static refinement table for a (owner-class, method-name, kind) entry. Kernel methods are mixed into every non-BasicObject class, so an implicit-self __dir__ call (receiver_type = Nominal) is matched by looking up Kernel as the owner. Explicit Kernel.__dir__ (receiver_type = Singleton) and instance-side calls (receiver_type = Nominal) share the :both row.

The receiver-side ancestor check is intentionally cheap: any non-BasicObject Nominal / Singleton matches every Kernel-owned override. BasicObject explicitly excludes Kernel and is therefore rejected. The narrow risk of a user-defined def __dir__ shadowing Kernel's method would also alter the runtime answer; users with that configuration opt out via a signature_paths overlay declaring their own return type.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 366

def try_static_refinement(receiver_type, method_name, arg_types)
  candidates = Rigor::Builtins::StaticReturnRefinements.owners_for(method_name)
  return nil if candidates.empty?

  owner = static_refinement_owner_for(receiver_type, candidates)
  return nil unless owner

  kind = receiver_type.is_a?(Type::Singleton) ? :singleton : :instance
  Rigor::Builtins::StaticReturnRefinements.lookup(
    owner_class_name: owner,
    method_name: method_name,
    kind: kind,
    arg_types: arg_types
  )
end

.try_synthesized_stub_type(receiver_type, environment) ⇒ Object

ADR-5 robustness — returns Dynamic[Top] when the receiver is an instance or singleton of a type Rigor synthesized (a missing-namespace module or a referenced-type stub). The stub has no methods, so the call would otherwise reach the user-class fallback and surface call.undefined-method; the honest answer for a type Rigor invented is "unknown shape", i.e. Dynamic[Top]. Returns nil (declines) for any real type.



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# File 'lib/rigor/inference/method_dispatcher.rb', line 319

def try_synthesized_stub_type(receiver_type, environment)
  return nil if environment.nil?

  loader = environment.rbs_loader
  return nil if loader.nil? || !loader.respond_to?(:synthesized_type_names)

  names = loader.synthesized_type_names
  return nil if names.empty?

  class_name =
    case receiver_type
    when Type::Nominal, Type::Singleton then receiver_type.class_name.to_s.sub(/\A::/, "")
    end
  return nil unless class_name && names.include?(class_name)

  Type::Combinator.untyped
end

.try_synthetic_method(receiver_type, method_name, arg_types, block_type, environment) ⇒ Object

ADR-16 synthetic-method tier. Slice 2b shipped the floor — a match short-circuits at the right precedence (above dep-source / discovered / user-class-fallback; below RBS) and returns Dynamic[T]. Slice 6 (precision promotion):

  • Tier B path (slice 6a, provenance[:origin_module] recorded by the slice-3b scanner): redispatch on Nominal[origin_module] via RbsDispatch so the module's authored RBS return type wins. Devise's valid_password? returns bool, not Dynamic[T].
  • Tier C path (slice 6b, plain return_type: string from the manifest's emit table): look up environment.nominal_for_name(return_type) so attribute :avatar, Types::String emits a synthetic reader returning Nominal[ActiveStorage::Attached::One] (when the class is in RBS). Unparameterised class names only — parameterised forms (Array[String], Hash[K, V]) and plugin-supplied utility-type names (Pick<T, K>) require routing through the full ADR-13 Plugin::TypeNodeResolver chain, which slice 6 does not yet wire in (the resolver chain is consulted only for %a{rigor:v1:…} payloads as of ADR-13 slice 3).


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# File 'lib/rigor/inference/method_dispatcher.rb', line 436

def try_synthetic_method(receiver_type, method_name, arg_types, block_type, environment)
  index = environment&.synthetic_method_index
  return nil if index.nil? || index.empty?

  class_name = synthetic_method_class_name(receiver_type)
  return nil if class_name.nil?

  matches = case receiver_type
            when Type::Singleton then index.lookup_singleton(class_name, method_name)
            else index.lookup_instance(class_name, method_name)
            end
  return nil if matches.empty?

  promoted = promote_synthetic_match(matches, method_name, arg_types, block_type, environment)
  promoted || Type::Combinator.untyped
end

.try_user_class_fallback(receiver_type, environment, call_node, context) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 801

def try_user_class_fallback(receiver_type, environment, call_node, context)
  return nil if environment.nil?

  fallback_receiver = user_class_fallback_receiver(receiver_type, environment)
  return nil if fallback_receiver.nil?

  # Preserve the ORIGINAL receiver type as the `self` substitution so `Kernel#dup: () ->
  # self` and other `self`-returning methods route through Object's RBS while still
  # returning the caller's type rather than `Object`. Without this, `base = self.dup`
  # inside a `Bundler::URI::Generic` instance method types `base` as `Object` because
  # `Bundler::URI::Generic` is not in RBS and the fallback's `self` resolves to Object.
  #
  # `public_only:` — when the call has an EXPLICIT, non-`self` receiver
  # (`Favourite.select(...)`), suppress the private `Object`/`Kernel`/`Class` methods the
  # fallback would otherwise resolve. Ruby raises `NoMethodError` for a private method
  # called with an explicit receiver, so resolving `Favourite.select` to the private
  # `Kernel#select` (`-> Array[String]`) is a confidently-wrong type. Implicit-self /
  # `self.`-receiver calls (`puts`, `raise`, `require`) keep resolving — those are the
  # fallback's intended targets.
  RbsDispatch.try_dispatch(
    context.with(
      receiver: fallback_receiver,
      self_type_override: receiver_type,
      public_only: explicit_non_self_receiver?(call_node),
      call_node: nil, scope: nil
    )
  )
end

.user_class_fallback_receiver(receiver_type, environment) ⇒ Object 



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# File 'lib/rigor/inference/method_dispatcher.rb', line 845

def user_class_fallback_receiver(receiver_type, environment)
  case receiver_type
  when Type::Nominal
    # Modules: even when RBS knows the module, an instance method on a mixin-only module
    # (e.g. `PP::ObjectMixin`) observes Kernel / Object methods through every concrete
    # includer's ancestor chain. Route through the `Nominal[Object]` fallback so
    # `self.inspect` / `self.respond_to?` / `self.class` resolve cleanly when the module
    # itself does not declare them.
    known = Rigor::Reflection.rbs_class_known?(receiver_type.class_name, environment: environment)
    return environment.nominal_for_name("Object") if !known || environment.rbs_module?(receiver_type.class_name)

    nil
  when Type::Singleton
    return nil if Rigor::Reflection.rbs_class_known?(receiver_type.class_name, environment: environment)

    environment.singleton_for_name("Class")
  end
end

Instance Method Details

#self?.dispatch ⇒ Type::t?

Parameters:

  • receiver_type: (Type::t, nil)
  • method_name: (Symbol)
  • arg_types: (Array[Type::t])
  • block_type: (Type::t, nil)
  • environment: (Environment, nil)

Returns:

  • (Type::t, nil) 


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# File 'sig/rigor/inference.rbs', line 61

def self?.dispatch: (receiver_type: Type::t?, method_name: Symbol, arg_types: Array[Type::t], ?block_type: Type::t?, ?environment: Environment?) -> Type::t?

#self?.expected_block_param_types ⇒ Array[Type::t]

Parameters:

  • receiver_type: (Type::t, nil)
  • method_name: (Symbol)
  • arg_types: (Array[Type::t])
  • environment: (Environment, nil)

Returns:

  • (Array[Type::t]) 


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# File 'sig/rigor/inference.rbs', line 62

def self?.expected_block_param_types: (receiver_type: Type::t?, method_name: Symbol, arg_types: Array[Type::t], ?environment: Environment?) -> Array[Type::t]