allow displaying entities from multiple scopes

docca.py

@@ -1258,6 +1258,13 @@ def load_configs(args):
     for file_name in args.config:
         with open(file_name, 'r', encoding='utf-8') as file:
             result.update( json.load(file) )
+    if 'allowed_prefixes' not in result:
+        allowed_prefixes = ['']
+        default_ns = result.get('default_namespace')
+        if default_ns:
+            allowed_prefixes[0] = default_ns + '::'
+        result['allowed_prefixes'] = allowed_prefixes
+
     return result
 
 def collect_compound_refs(file):

include/docca/quickbook.jinja2

@@ -18,11 +18,19 @@ The template also expects a Config global dictionary that contains
 configuration parameters from the merged JSON config files passed to the docca
 program. By default the dictionary looks like this:
 {
-    "include_private": False
+    "include_private": False,
+    "legacy_behavior": True,
+    "allowed_prefixes": [""],
 }
 In adition:
-* It uses "default_namespace" Config key to only output entities in a specific
-    namespace.
+* It uses "default_namespace" Config key to strip fully qualifed names of
+  entities in that namespace from the prefix {default_namespace}::.
+* It uses "allowed_prefixes" Config key to only output entities in a specific
+    scope. This is done by checking if the FQN of the entity is prefixed with
+    an allowed prefix, or if it is itself a prefix of an allowed prefix. By
+    default this setting is [""] (allow any entity) unless "default_namespace"
+    is set, in which case it looks like ["{default_namespace}::"] (allow
+    everything in the default namespace).
 * It uses "link_prefix" Config key as prefix for every generated cross-link.
 * It uses "convenience_header" Config key for "Convenience Header" subsections.
 * It uses "show_defaulted" Config key to determine whether to display if a
@@ -317,16 +325,11 @@ are enabled.
 #}
 
 
-{% import "docca/quickbook/components.jinja2" as comps -%}
+{%- import "docca/quickbook/components.jinja2" as comps -%}
 
-{% for entity in entities.values() -%}
-    {% if entity is not Namespace -%}
-        {% continue %}
+{%- for entity in entities.values() -%}
+    {%- if entity is not Namespace -%}
+        {%- continue -%}
     {%- endif -%}
-    {% if Config.get('default_namespace')
-        and entity.fully_qualified_name != Config.default_namespace -%}
-        {% continue %}
-    {%- endif -%}
-
-    {{ comps.write_namespace(entity) }}
+    {{ comps.write_entity(entity) }}
 {%- endfor %}

include/docca/quickbook/components.jinja2

@@ -8,33 +8,39 @@ Official repository: https://github.com/boostorg/json
 #}
 
 {% macro write_entity(entity) -%}
-    {% if entity.access != Access.private or Config.include_private -%}
-        {%- if entity is Namespace -%}
-            {{ write_namespace(entity) }}
-        {%- elif entity is Type -%}
-            {{ write_type(entity) }}
-        {%- elif entity is OverloadSet -%}
-            {{ write_overload_set(entity) }}
-        {%- elif entity is Variable -%}
-            {{ write_variable(entity) }}
-        {%- elif entity is Function -%}
-            {{ write_function(entity) }}
-        {%- endif -%}
+    {% if (entity.access != Access.private or Config.include_private)
+            and not is_external(entity) -%}
+        {%- for prefix in Config.allowed_prefixes %}
+            {%- set fqn = entity.fully_qualified_name -%}
+            {%- if fqn.startswith(prefix) or prefix.startswith(fqn) -%}
+                {%- if entity is Namespace -%}
+                    {{ write_namespace(entity) }}
+                {%- elif entity is Type -%}
+                    {{ write_type(entity) }}
+                {%- elif entity is OverloadSet -%}
+                    {{ write_overload_set(entity) }}
+                {%- elif entity is Variable -%}
+                    {{ write_variable(entity) }}
+                {%- elif entity is Function -%}
+                    {{ write_function(entity) }}
+                {%- endif -%}
+            {%- endif -%}
+        {%- endfor -%}
     {%- endif -%}
 {%- endmacro %}
 
 
 {% macro write_namespace(entity) -%}
     {%- for m in entity.members.values() | select("Type") | sort -%}
-        {{ write_type(m) }}
+        {{ write_entity(m) }}
     {%- endfor -%}
 
     {%- for m in entity.members.values() | select("OverloadSet") | sort -%}
-        {{ write_overload_set(m) }}
+        {{ write_entity(m) }}
     {%- endfor -%}
 
     {%- for m in entity.members.values() | select("Variable") | sort -%}
-        {{ write_variable(m) }}
+        {{ write_entity(m) }}
     {%- endfor -%}
 {%- endmacro %}
 
@@ -685,9 +691,7 @@ Convenience header {{ source_header(Config.convenience_header) }}
         [*{{ phrase(part, in_code=in_code) }}]
     {%- elif part is EntityRef -%}
         {%- if in_code %}``{% endif -%}
-        {%- if Config.get('external_marker')
-            and (part.entity.brief | map(attribute="text") | join | trim)
-                == Config.get('external_marker') -%}
+        {%- if is_external(part.entity) -%}
             [@
             {%- for part in part.entity.description -%}
                 {%- if part is Section and part.kind == Section.See -%}
@@ -837,3 +841,19 @@ Convenience header {{ source_header(Config.convenience_header) }}
 {% macro escape(s) -%}
     {{ s.replace("[", "\\[").replace("]", "\\]") }}
 {%- endmacro %}
+
+
+{%- macro is_external(entity) -%}
+    {%- if not Config.get('external_marker') -%}
+    {%- else -%}
+        {%- set ns = namespace(brief=entity.brief) -%}
+        {%- if entity is OverloadSet -%}
+            {%- set ns.brief = ns.brief[0] -%}
+        {%- endif -%}
+        {%- if (ns.brief | map(attribute="text") | join | trim)
+                == Config.get('external_marker') -%}
+            1
+        {%- else -%}
+        {%- endif -%}
+    {%- endif -%}
+{%- endmacro -%}

test/docca_qbk_test.py

@@ -19,7 +19,7 @@ from docca_test_helpers import make_elem
 
 @pytest.fixture
 def cfg():
-    return dict(legacy_behavior=False)
+    return dict(legacy_behavior=False, allowed_prefixes=[''])
 
 @pytest.fixture
 def entities():

test/docca_test.py

@@ -2282,6 +2282,7 @@ def test_load_configs(tmpdir):
     assert conf == {
         'include_private': False,
         'legacy_behavior': True,
+        'allowed_prefixes': [''],
     }
 
     c = os.path.join(tmpdir, 'c1')
@@ -2293,6 +2294,7 @@ def test_load_configs(tmpdir):
         'include_private': False,
         'legacy_behavior': True,
         'A': 1,
+        'allowed_prefixes': [''],
     }
 
     c = os.path.join(tmpdir, 'c2')
@@ -2305,6 +2307,7 @@ def test_load_configs(tmpdir):
         'legacy_behavior': True,
         'A': 1,
         'B': 2,
+        'allowed_prefixes': [''],
     }
 
     c = os.path.join(tmpdir, 'c3')
@@ -2318,6 +2321,37 @@ def test_load_configs(tmpdir):
         'A': 3,
         'B': 2,
         'C': True,
+        'allowed_prefixes': [''],
+    }
+
+    c = os.path.join(tmpdir, 'c4')
+    with open(c, 'w', encoding='utf-8') as f:
+        f.write('{ "default_namespace": "qwerty::uiop12" }')
+    args.config.append(c)
+    conf = docca.load_configs(args)
+    assert conf == {
+        'include_private': False,
+        'legacy_behavior': True,
+        'A': 3,
+        'B': 2,
+        'C': True,
+        'default_namespace': 'qwerty::uiop12',
+        'allowed_prefixes': ['qwerty::uiop12::'],
+    }
+
+    c = os.path.join(tmpdir, 'c5')
+    with open(c, 'w', encoding='utf-8') as f:
+        f.write('{ "allowed_prefixes": ["a::", "b::c::"] }')
+    args.config.append(c)
+    conf = docca.load_configs(args)
+    assert conf == {
+        'include_private': False,
+        'legacy_behavior': True,
+        'A': 3,
+        'B': 2,
+        'C': True,
+        'default_namespace': 'qwerty::uiop12',
+        'allowed_prefixes': ['a::', 'b::c::'],
     }
 
 def test_docca_include_dir():