Cleanup and add docs

src/spectator/example_builder.cr

@@ -1,12 +1,25 @@
+require "./context"
+require "./example"
+require "./location"
+require "./metadata"
 require "./node_builder"
 
 module Spectator
+  # Constructs examples.
+  # Call `#build` to produce an `Example`.
   class ExampleBuilder < NodeBuilder
+    # Creates the builder.
+    # A proc provided by *context_builder* is used to create a unique `Context` for each example produced by `#build`.
+    # The *entrypoint* indicates the proc used to invoke the test code in the example.
+    # The *name*, *location*, and *metadata* will be applied to the `Example` produced by `#build`.
     def initialize(@context_builder : -> Context, @entrypoint : Example ->,
                    @name : String? = nil, @location : Location? = nil, @metadata : Metadata = Metadata.new)
     end
 
-    def build(parent)
+    # Constructs an example with previously defined attributes and context.
+    # The *parent* is an already constructed example group to nest the new example under.
+    # It can be nil if the new example won't have a parent.
+    def build(parent = nil)
       context = @context_builder.call
       Example.new(context, @entrypoint, @name, @location, parent, @metadata)
     end

src/spectator/example_group_builder.cr

@@ -1,6 +1,16 @@
+require "./example_group"
+require "./example_group_hook"
+require "./example_hook"
+require "./example_procsy_hook"
+require "./label"
+require "./location"
+require "./metadata"
 require "./node_builder"
 
 module Spectator
+  # Progressively constructs an example group.
+  # Hooks and builders for child nodes can be added over time to this builder.
+  # When done, call `#build` to produce an `ExampleGroup`.
   class ExampleGroupBuilder < NodeBuilder
     @children = [] of NodeBuilder
     @before_all_hooks = [] of ExampleGroupHook
@@ -9,6 +19,9 @@ module Spectator
     @after_each_hooks = [] of ExampleHook
     @around_each_hooks = [] of ExampleProcsyHook
 
+    # Creates the builder.
+    # Initially, the builder will have no children and no hooks.
+    # The *name*, *location*, and *metadata* will be applied to the `ExampleGroup` produced by `#build`.
     def initialize(@name : Label = nil, @location : Location? = nil, @metadata : Metadata = Metadata.new)
     end
 
@@ -68,19 +81,30 @@ module Spectator
       @around_each_hooks << ExampleProcsyHook.new(label: "around_each", &block)
     end
 
+    # Constructs an example group with previously defined attributes, children, and hooks.
+    # The *parent* is an already constructed example group to nest the new example group under.
+    # It can be nil if the new example group won't have a parent.
     def build(parent = nil)
       ExampleGroup.new(@name, @location, parent, @metadata).tap do |group|
-        @before_all_hooks.each { |hook| group.add_before_all_hook(hook) }
-        @before_each_hooks.each { |hook| group.add_before_each_hook(hook) }
-        @after_all_hooks.each { |hook| group.add_after_all_hook(hook) }
-        @after_each_hooks.each { |hook| group.add_after_each_hook(hook) }
-        @around_each_hooks.each { |hook| group.add_around_each_hook(hook) }
+        apply_hooks(group)
         @children.each(&.build(group))
       end
     end
 
+    # Adds a child builder to the group.
+    # The *builder* will have `NodeBuilder#build` called on it from within `#build`.
+    # The new example group will be passed to it.
     def <<(builder)
       @children << builder
     end
+
+    # Adds all previously configured hooks to an example group.
+    private def apply_hooks(group)
+      @before_all_hooks.each { |hook| group.add_before_all_hook(hook) }
+      @before_each_hooks.each { |hook| group.add_before_each_hook(hook) }
+      @after_all_hooks.each { |hook| group.add_after_all_hook(hook) }
+      @after_each_hooks.each { |hook| group.add_after_each_hook(hook) }
+      @around_each_hooks.each { |hook| group.add_around_each_hook(hook) }
+    end
   end
 end

src/spectator/example_group_iteration.cr

@@ -1,9 +1,22 @@
 require "./example_group"
+require "./label"
+require "./location"
+require "./metadata"
 
 module Spectator
+  # Collection of examples and sub-groups for a single iteration of an iterative example group.
   class ExampleGroupIteration(T) < ExampleGroup
+    # Item for this iteration of the example groups.
     getter item : T
 
+    # Creates the example group iteration.
+    # The element for the current iteration is provided by *item*.
+    # The *name* describes the purpose of the group.
+    # It can be a `Symbol` to describe a type.
+    # This is typically a stringified form of *item*.
+    # The *location* tracks where the group exists in source code.
+    # This group will be assigned to the parent *group* if it is provided.
+    # A set of *metadata* can be used for filtering and modifying example behavior.
     def initialize(@item : T, name : Label = nil, location : Location? = nil,
                    group : ExampleGroup? = nil, metadata : Metadata = Metadata.new)
       super(name, location, group, metadata)

src/spectator/iterative_example_group_builder.cr

@@ -1,31 +1,48 @@
+require "./example_group"
 require "./example_group_builder"
 require "./example_group_iteration"
+require "./location"
+require "./metadata"
 
 module Spectator
+  # Progressively constructs an iterative example group.
+  # Hooks and builders for child nodes can be added over time to this builder.
+  # When done, call `#build` to produce an `ExampleGroup` with nested `ExampleGroupIteration` instances.
   class IterativeExampleGroupBuilder(T) < ExampleGroupBuilder
+    # Creates the builder.
+    # Initially, the builder will have no children and no hooks.
+    # The *name*, *location*, and *metadata* will be applied to the `ExampleGroup` produced by `#build`.
+    # The *collection* is the set of items to create sub-nodes for.
+    # The *iterator* is an optional name given to a single item in the collection.
     def initialize(@collection : Enumerable(T), name : String? = nil, @iterator : String? = nil,
                    location : Location? = nil, metadata : Metadata = Metadata.new)
       super(name, location, metadata)
     end
 
+    # Constructs an iterative example group with previously defined attributes, children, and hooks.
+    # The *parent* is an already constructed example group to nest the new example group under.
+    # It can be nil if the new example group won't have a parent.
     def build(parent = nil)
       ExampleGroup.new(@name, @location, parent, @metadata).tap do |group|
-        @before_all_hooks.each { |hook| group.add_before_all_hook(hook) }
-        @before_each_hooks.each { |hook| group.add_before_each_hook(hook) }
-        @after_all_hooks.each { |hook| group.add_after_all_hook(hook) }
-        @after_each_hooks.each { |hook| group.add_after_each_hook(hook) }
-        @around_each_hooks.each { |hook| group.add_around_each_hook(hook) }
+        # Hooks are applied once to the outer group,
+        # instead of multiple times for each inner group (iteration).
+        apply_hooks(group)
+
         @collection.each do |item|
-          name = if iterator = @iterator
-                   "#{iterator}: #{item.inspect}"
-                 else
-                   item.inspect
-                 end
-          ExampleGroupIteration.new(item, name, @location, group).tap do |iteration|
+          ExampleGroupIteration.new(item, iteration_name(item), @location, group).tap do |iteration|
             @children.each(&.build(iteration))
           end
         end
       end
     end
+
+    # Constructs the name of an example group iteration.
+    private def iteration_name(item)
+      if iterator = @iterator
+        "#{iterator}: #{item.inspect}"
+      else
+        item.inspect
+      end
+    end
   end
 end

src/spectator/node_builder.cr

@@ -1,5 +1,6 @@
 module Spectator
   abstract class NodeBuilder
-    abstract def build(parent)
+    # Produces a node for a spec.
+    abstract def build(parent = nil)
   end
 end

src/spectator/pending_example_builder.cr

@@ -1,11 +1,21 @@
+require "./example"
+require "./location"
+require "./metadata"
 require "./node_builder"
 
 module Spectator
+  # Constructs pending examples.
+  # Call `#build` to produce an `Example`.
   class PendingExampleBuilder < NodeBuilder
+    # Creates the builder.
+    # The *name*, *location*, and *metadata* will be applied to the `Example` produced by `#build`.
     def initialize(@name : String? = nil, @location : Location? = nil, @metadata : Metadata = Metadata.new)
     end
 
-    def build(parent)
+    # Constructs an example with previously defined attributes.
+    # The *parent* is an already constructed example group to nest the new example under.
+    # It can be nil if the new example won't have a parent.
+    def build(parent = nil)
       Example.pending(@name, @location, parent, @metadata)
     end
   end

src/spectator/spec_builder.cr

@@ -71,6 +71,8 @@ module Spectator
     #
     # The *collection* is the set of items to iterate over.
     # Child nodes in this group will be executed once for every item in the collection.
+    # The *name* should be a string representation of *collection*.
+    # The *iterator* is an optional name given to a single item in *collection*.
     #
     # The *location* optionally defined where the group originates in source code.
     #