feat(page): DocsUI::Endpoint + FieldTable/ErrorTable — the endpoint-reference kit

README.md

@@ -26,6 +26,8 @@ A `DocsUI::` Phlex kit, configured once per site:
 | `DocsUI::Header` / `Section` / `Prose` / `Callout` | The page-authoring kit. |
 | `DocsUI::Markdown` | GFM Markdown island — prose as Markdown, styled like `Prose`, fenced code through Rouge. |
 | `DocsUI::Table` / `PropTable` | Reference tables — generic headers+rows, and a name/type/default/description preset. |
+| `DocsUI::Endpoint` | HTTP method badge (coloured per verb) + monospace path; renders inline (drops into a `Section` description). |
+| `DocsUI::FieldTable` / `ErrorTable` | API-reference presets over `Table` — an object's fields, and an endpoint's errors (Param column auto-hidden when unused). |
 | `DocsUI::Example` | Base for a live example with `method_source`-extracted source. |
 
 Plus `DocsKit::Registry` (in-memory docs registry mixin), `DocsKit::NavItem`

app/components/docs_ui/endpoint.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+module DocsUI
+  # An HTTP endpoint reference line — a method badge followed by the path — in the
+  # kit's daisyUI look. This is the `code(class: "badge …")` lambda every API page
+  # was hand-rolling; compose it instead.
+  #
+  #   render DocsUI::Endpoint.new(:post, "/v1/messages")
+  #   # => POST /v1/messages   (POST as a primary badge, path monospace)
+  #
+  # It renders INLINE (no block wrapper), so it drops straight into a Section
+  # description or a run of prose:
+  #
+  #   DocsUI::Section("Create a message", description: DocsUI::Endpoint.new(:post, "/v1/messages"))
+  #
+  # The verb → badge-colour map is an explicit frozen Hash of LITERAL class
+  # strings so the Tailwind scan (which reads the gem's Ruby) sees every badge
+  # class and generates it. An unknown verb falls back to a neutral badge and
+  # never raises — a typo degrades gracefully rather than blowing up a render.
+  class Endpoint < Phlex::HTML
+    # Each value is a single literal string (not interpolated) so Tailwind's
+    # source scan generates the colour. Keep these literal — see Critical Rule 6.
+    BADGE_CLASSES = {
+      "GET" => "badge badge-sm badge-success",
+      "POST" => "badge badge-sm badge-primary",
+      "PUT" => "badge badge-sm badge-warning",
+      "PATCH" => "badge badge-sm badge-warning",
+      "DELETE" => "badge badge-sm badge-error"
+    }.freeze
+
+    NEUTRAL_BADGE = "badge badge-sm badge-neutral"
+
+    def initialize(method, path)
+      @method = method.to_s.upcase
+      @path = path
+    end
+
+    def view_template
+      code(class: BADGE_CLASSES.fetch(@method, NEUTRAL_BADGE)) { plain @method }
+      whitespace
+      code { plain @path }
+    end
+  end
+end

app/components/docs_ui/error_table.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+module DocsUI
+  # An error reference table for an API endpoint — a keyword-schema preset over
+  # DocsUI::Table. Each error is a Hash:
+  #
+  #   render DocsUI::ErrorTable.new(
+  #     [
+  #       { scenario: "Missing or invalid API key", status: "401", type: "authentication_error" },
+  #       { scenario: "Non-HTTPS URL",              status: "422", type: "validation_error", param: "url" },
+  #     ]
+  #   )
+  #
+  # Columns: Scenario / Status / Type (auto code-styled) / Param (auto code-styled).
+  # The Param column is shown only when at least one error names a param — an
+  # endpoint whose errors are all param-free renders a clean three-column table.
+  # When the column IS shown, a param-free row gets the canonical em-dash `—`.
+  class ErrorTable < Phlex::HTML
+    BASE_HEADERS = %w[Scenario Status Type].freeze
+    PARAM_HEADER = "Param"
+
+    # Shared with FieldTable's canonical "no value" placeholder.
+    NO_PARAM = "—"
+
+    def initialize(errors)
+      @errors = errors
+      @with_param = errors.any? { |error| error[:param] }
+    end
+
+    def view_template
+      render DocsUI::Table.new(headers, @errors.map { |error| row(error) })
+    end
+
+    private
+
+    def headers
+      @with_param ? [*BASE_HEADERS, PARAM_HEADER] : BASE_HEADERS
+    end
+
+    def row(error)
+      cells = [
+        error.fetch(:scenario),
+        error.fetch(:status),
+        [:code, error.fetch(:type)]
+      ]
+      cells << param_cell(error) if @with_param
+      cells
+    end
+
+    def param_cell(error)
+      param = error[:param]
+      param ? [:code, param] : NO_PARAM
+    end
+  end
+end

app/components/docs_ui/field_table.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module DocsUI
+  # A parameter/field reference table for an API object or request body — a
+  # keyword-schema preset over DocsUI::Table. Each field is a Hash:
+  #
+  #   render DocsUI::FieldTable.new(
+  #     [
+  #       { name: "url",         type: "string", required: true, description: "HTTPS destination URL." },
+  #       { name: "description", type: "string",                 description: "Optional internal label." },
+  #       { name: "events",      type: "array",  required: true, description: [:md, "e.g. `payment_link.paid`"] },
+  #     ]
+  #   )
+  #
+  # Columns: Name (auto code-styled) / Type / Required (✓ or the canonical em-dash
+  # `—`) / Description. `required:` defaults to false. The description cell follows
+  # DocsUI::Table's convention — a plain String is escaped text, `[:code, "x"]` is
+  # inline code, `[:md, "…"]` is inline Markdown.
+  class FieldTable < Phlex::HTML
+    HEADERS = %w[Name Type Required Description].freeze
+
+    # The ONE canonical "no value" placeholder across the whole kit — never the
+    # ASCII hyphen "-", never a bare "—" typed ad hoc in a page.
+    REQUIRED_YES = "✓"
+    REQUIRED_NO = "—"
+
+    def initialize(fields)
+      @fields = fields
+    end
+
+    def view_template
+      render DocsUI::Table.new(HEADERS, @fields.map { |field| row(field) })
+    end
+
+    private
+
+    def row(field)
+      [
+        [:code, field.fetch(:name)],
+        field.fetch(:type),
+        field.fetch(:required, false) ? REQUIRED_YES : REQUIRED_NO,
+        field.fetch(:description)
+      ]
+    end
+  end
+end

app/components/docs_ui/section.rb

@@ -18,6 +18,10 @@ module DocsUI
   #     code(class: "badge badge-sm") { "POST" }; plain " /v1/messages"
   #   }) { render DocsUI::Prose.new { … } }
   #
+  #   # or pass a renderable Phlex component directly (e.g. DocsUI::Endpoint)
+  #   render DocsUI::Section.new("Create a message",
+  #     description: DocsUI::Endpoint.new(:post, "/v1/messages")) { … }
+  #
   # The description is rendered only when present, so plain sections are unchanged.
   class Section < Phlex::HTML
     def initialize(title, id: nil, description: nil)
@@ -45,16 +49,19 @@ def heading
       end
     end
 
-    # The optional description: a String is rendered as text; a callable (proc/
-    # lambda) is instance_exec'd so it can emit rich Phlex markup (code, badges).
+    # The optional description, rendered under the title. Three accepted forms:
+    #   * a Phlex component instance (e.g. DocsUI::Endpoint) → rendered in place;
+    #   * a proc/lambda → instance_exec'd so it can emit rich Phlex markup;
+    #   * a String → plain, Phlex-escaped text.
+    # A Phlex component also responds to #call, so it MUST be matched before the
+    # callable branch (else it would be instance_exec'd, not rendered).
     def description
       return unless @description
 
       p(class: "mb-4 text-base leading-relaxed text-base-content/70") do
-        if @description.respond_to?(:call)
-          instance_exec(&@description)
-        else
-          plain @description
+        case @description
+        when Phlex::SGML then render @description
+        else @description.respond_to?(:call) ? instance_exec(&@description) : plain(@description)
         end
       end
     end

docs/app/views/docs/pages/components.rb

@@ -21,6 +21,7 @@ def content
           code_section
           example_section
           table_section
+          endpoint_section
           callout_section
           icon_section
           on_this_page_section
@@ -322,6 +323,87 @@ def table_section
           end
         end
 
+        def endpoint_section
+          DocsUI::Section(
+            "Endpoint, FieldTable & ErrorTable",
+            description: "The API-reference kit — a method+path line, a fields table, and an error table."
+          ) do
+            prose do
+              p do
+                code { "DocsUI::Endpoint" }
+                plain " renders an HTTP method badge (coloured per verb) plus a monospace path, inline — so it drops straight into a "
+                code { "Section" }
+                plain " description. "
+                code { "FieldTable" }
+                plain " and "
+                code { "ErrorTable" }
+                plain " are keyword-schema presets over "
+                code { "Table" }
+                plain " for an object's fields and an endpoint's errors."
+              end
+            end
+
+            # A Section whose description IS a live Endpoint — the real component,
+            # not a mock-up.
+            DocsUI::Section(
+              "Create a webhook endpoint",
+              description: DocsUI::Endpoint.new(:post, "/api/webhook_endpoints")
+            ) do
+              prose { p { "Registers a destination URL for outbound event notifications." } }
+              render DocsUI::FieldTable.new(
+                [
+                  { name: "url", type: "string", required: true, description: "HTTPS destination URL." },
+                  { name: "description", type: "string", description: "Optional internal label." },
+                  { name: "events", type: "array", required: true, description: [ :md, "Event types, e.g. `payment_link.paid`." ] }
+                ]
+              )
+              render DocsUI::ErrorTable.new(
+                [
+                  { scenario: "Missing or invalid API key", status: "401", type: "authentication_error" },
+                  { scenario: "Non-HTTPS URL", status: "422", type: "validation_error", param: "url" },
+                  { scenario: "Unknown event name", status: "422", type: "validation_error", param: "events" }
+                ]
+              )
+            end
+
+            prose { p { "The calls that produced the block above:" } }
+            DocsUI::Code(<<~RUBY)
+              DocsUI::Section("Create a webhook endpoint",
+                description: DocsUI::Endpoint.new(:post, "/api/webhook_endpoints")) do
+                render DocsUI::FieldTable.new([
+                  { name: "url", type: "string", required: true, description: "HTTPS destination URL." },
+                  { name: "events", type: "array", required: true, description: [:md, "e.g. `payment_link.paid`."] }
+                ])
+                render DocsUI::ErrorTable.new([
+                  { scenario: "Non-HTTPS URL", status: "422", type: "validation_error", param: "url" }
+                ])
+              end
+            RUBY
+
+            DocsUI::Callout(:tip) do
+              plain "Verb → colour is a frozen Hash of literal badge classes ("
+              code { "GET" }
+              plain " → success, "
+              code { "POST" }
+              plain " → primary, "
+              code { "PATCH/PUT" }
+              plain " → warning, "
+              code { "DELETE" }
+              plain " → error). An unknown verb renders a neutral badge — no raise."
+            end
+
+            render DocsUI::PropTable.new(
+              [
+                [ "DocsUI::Endpoint.new(method, path)", "Symbol/String, String", "—", "Method badge + monospace path; renders inline." ],
+                [ "DocsUI::FieldTable.new(fields)", "Array<Hash>", "—", "Each: { name:, type:, required: false, description: }." ],
+                [ "DocsUI::ErrorTable.new(errors)", "Array<Hash>", "—", "Each: { scenario:, status:, type:, param: nil }; Param column auto-hidden." ],
+                [ "Section(description:)", "String, proc, or component", "nil", "Now also accepts a Phlex component instance." ]
+              ],
+              headers: [ "Call", "Type", "Default", "Description" ]
+            )
+          end
+        end
+
         def callout_section
           DocsUI::Section("Callout", description: "note / tip / warning — a daisyUI alert with a lucide icon.") do
             DocsUI::Callout(:note) { "This is a note callout." }

spec/docs_ui/endpoint_spec.rb

@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+RSpec.describe DocsUI::Endpoint do
+  def render_endpoint(...)
+    described_class.new(...).call
+  end
+
+  it "renders the HTTP method as a daisyUI badge" do
+    html = render_endpoint(:post, "/v1/messages")
+
+    expect(html).to include("badge")
+    expect(html).to include("badge-sm")
+    expect(html).to include("POST")
+  end
+
+  it "renders the path in a monospace <code>" do
+    html = render_endpoint(:post, "/v1/messages")
+
+    expect(html).to include("<code")
+    expect(html).to include("/v1/messages")
+  end
+
+  it "upcases a lowercase method symbol for the badge label" do
+    html = render_endpoint(:get, "/v1/messages")
+
+    expect(html).to include(">GET<")
+  end
+
+  it "maps GET to badge-success" do
+    expect(render_endpoint(:get, "/x")).to include("badge-success")
+  end
+
+  it "maps POST to badge-primary" do
+    expect(render_endpoint(:post, "/x")).to include("badge-primary")
+  end
+
+  it "maps PATCH to badge-warning" do
+    expect(render_endpoint(:patch, "/x")).to include("badge-warning")
+  end
+
+  it "maps PUT to badge-warning" do
+    expect(render_endpoint(:put, "/x")).to include("badge-warning")
+  end
+
+  it "maps DELETE to badge-error" do
+    expect(render_endpoint(:delete, "/x")).to include("badge-error")
+  end
+
+  it "accepts a String method (not only a Symbol)" do
+    html = render_endpoint("POST", "/x")
+
+    expect(html).to include("badge-primary")
+    expect(html).to include(">POST<")
+  end
+
+  it "falls back to a neutral badge for an unknown verb, without raising" do
+    html = nil
+    expect { html = render_endpoint(:trace, "/x") }.not_to raise_error
+
+    expect(html).to include("badge-neutral")
+    expect(html).to include(">TRACE<")
+    # No colored verb class leaks in for an unknown method.
+    expect(html).not_to include("badge-success")
+    expect(html).not_to include("badge-primary")
+  end
+
+  it "renders inline (no block wrapper) so it composes in a Section description" do
+    html = render_endpoint(:get, "/x")
+
+    # The badge sits directly next to the path — no surrounding <div>/<p> block.
+    expect(html).not_to include("<div")
+    expect(html).not_to include("<p>")
+  end
+
+  it "escapes HTML in the path (Phlex escaping, no html_safe)" do
+    html = render_endpoint(:get, "/x?<script>")
+
+    expect(html).to include("&lt;script&gt;")
+    expect(html).not_to include("<script>")
+  end
+end