brabect1 · June 29, 2024 11:48 · Jun 29, 2024 · Jun 24, 2024 · Jun 20, 2024 · Jun 20, 2024
diff --git a/xper_custom_directive.py b/xper_custom_directive.py
@@ -0,0 +1,114 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.frontend
+import docutils.utils
+import docutils.parsers
+import docutils.parsers.rst
+import docutils.parsers.rst.directives
+
+# this is merely to specifically identify elements derived
+# from the `my_extension` directive
+class mydirective(docutils.nodes.Element): pass
+
+class MyExtensionDirective(docutils.parsers.rst.Directive):
+    required_arguments = 1;
+    optional_arguments = 0;
+    final_argument_whitespace = True;
+    has_content = True;
+    option_spec = {'my_attr': docutils.parsers.rst.directives.unchanged,
+                   }
+
+    def run(self):
+        self.assert_has_content()
+        text = '\n'.join(self.content)
+        n = mydirective(text, **self.options)
+        self.add_name(n)
+
+        # this will turn the directive argument into a title node
+        # (as we generally allow the title to contain inline markup,
+        # we use the inline parser to get (`textnodes`) list of inline
+        # elements/nodes)
+        title_text = self.arguments[0]
+        textnodes, messages = self.state.inline_text(title_text,
+                                                     self.lineno)
+        # the following would end up calling TextElement(rawsource,text,*children) constructor
+        title = docutils.nodes.title(title_text, '', *textnodes)
+        title.source, title.line = (
+                self.state_machine.get_source_and_line(self.lineno))
+
+        # add a new sub-node and any system messages from the inline parsing
+        n += title
+        n += messages
+
+        # This will parse the directive content
+        self.state.nested_parse(self.content, self.content_offset,
+                                n)
+        return [n]
+
+# This overrides what directive class will be used to process the `my_extension` directive
+docutils.parsers.rst.directives._directives['my_extension'] = MyExtensionDirective;
+
+settings = docutils.frontend.OptionParser().get_default_values()
+
+parser_class = docutils.parsers.get_parser_class('restructuredtext')
+parser = parser_class()
+
+option_parser = docutils.frontend.OptionParser(
+    components=(parser,),
+    read_config_files=True,
+    description='')
+
+settings = option_parser.parse_args()
+
+
+document = docutils.utils.new_document('', settings)
+
+text = '''
+My title
+========
+
+1st paragraph
+
+Subtitle
+--------
+
+2nd paragraph
+
+.. my_extension:: This is my extension
+   :my_attr: 1 2 3
+     4 5 6
+
+   1st extension paragraph
+   
+   #. 1st numbered item
+   #. 2nd numbered item
+   
+3rd paragraph
+
+- a
+- b
+'''
+
+parser.parse(text, document)
+
+print(document.pformat())
diff --git a/customizing_rst_syntax.rst b/customizing_rst_syntax.rst
@@ -1,5 +1,29 @@
-Custom Directives in reStructuredText (rst)
-===========================================
+Customizing reStructuredText (rst) for Domain-specific Syntax
+=============================================================
+
+- document tree
+
+  - created by a ``Parser`` component (i.e. from reStructuredText input)
+  - manually constructed
+
+- ``docutils`` components
+
+  - ``Reader``: Intended to obtain input and pass it to a ``Parser``.
+  - ``Parser``: Generates a (docutils) document tree from a ``Reader`` input. docutils contains only a reStructuredText parser but potentially others may exists (e.g. markdown, html, etc.).
+  - ``Writer``: Turns a document tree into an output (e.g. html, LaTeX).
+
+- other "pieces"
+
+  - transforms: Called by a ``Parser`` for on-the-fly document tree manipulation.
+  - visitors: Operate on an existing document tree (i.e. after parsing). Can collect various information and/or manipulate the document tree.
+  - roles: ??? https://docutils.sourceforge.io/docs/ref/rst/roles.html (see example that creates a custom ``date`` role as alternative to a ``date::`` directive https://docutils.sourceforge.io/docs/ref/rst/directives.html#date)
+  - directives: ???
+
+Custom Roles
+------------
+
+Custom Directives
+-----------------
 
 https://docutils.sourceforge.io/docs/ref/rst/directives.html
 
@@ -33,20 +57,3 @@ https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#directives
 
 howto: https://docutils.sourceforge.io/docs/howto/rst-directives.html
 
-- document tree
-
-  - created by a ``Parser`` component (i.e. from reStructuredText input)
-  - manually constructed
-
-- ``docutils`` components
-
-  - ``Reader``: Intended to obtain input and pass it to a ``Parser``.
-  - ``Parser``: Generates a (docutils) document tree from a ``Reader`` input. docutils contains only a reStructuredText parser but potentially others may exists (e.g. markdown, html, etc.).
-  - ``Writer``: Turns a document tree into an output (e.g. html, LaTeX).
-
-- other "pieces"
-
-  - transforms: Called by a ``Parser`` for on-the-fly document tree manipulation.
-  - visitors: Operate on an existing document tree (i.e. after parsing). Can collect various information and/or manipulate the document tree.
-  - roles: ??? https://docutils.sourceforge.io/docs/ref/rst/roles.html (see example that creates a custom ``date`` role as alternative to a ``date::`` directive https://docutils.sourceforge.io/docs/ref/rst/directives.html#date)
-  - directives: ???
diff --git a/xper_manipulate_doctree.py b/xper_manipulate_doctree.py
@@ -0,0 +1,80 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.frontend
+import docutils.utils
+import docutils.parsers
+
+def is_note(node):
+    return node is not None and isinstance(node, docutils.nodes.note)
+
+def my_condition(node):
+    return node is not None and isinstance(node, docutils.nodes.list_item) and node.astext() == 'a'
+
+settings = docutils.frontend.OptionParser().get_default_values()
+
+parser_class = docutils.parsers.get_parser_class('restructuredtext')
+parser = parser_class()
+
+option_parser = docutils.frontend.OptionParser(
+    components=(parser,),
+    read_config_files=True,
+    description='')
+
+settings = option_parser.parse_args()
+
+
+document = docutils.utils.new_document('', settings)
+
+text = '''
+My title
+========
+
+.. note:: 1st paragraph
+
+   2nd paragraph
+
+3rd paragraph
+
+.. note:: 4th paragraph
+
+   - a
+   - b
+'''
+
+parser.parse(text, document)
+
+print(document.pformat())
+print(20 * '=')
+
+# in-place replacement of nodes
+for node in document.traverse(condition=is_note):
+    parent = node.parent;
+    childs = node.children;
+    parent.replace(node,childs)
+    # note: the above is equivalent to ``node.replace_self(node.children)``
+
+# deletion of nodes
+for node in document.traverse(condition=my_condition):
+    node.parent.remove(node)
+
+print(document.pformat())
diff --git a/custom_rst_directives.rst → customizing_rst_syntax.rst b/custom_rst_directives.rst → customizing_rst_syntax.rst
diff --git a/xper_title_visitor.py b/xper_title_visitor.py
@@ -1,5 +1,4 @@
 #! /usr/bin/env python
-from orca.scripts import self_voicing
 
 # Copyright 2024 Tomas Brabec
 # 

diff --git a/custom_rst_directives.rst b/custom_rst_directives.rst
@@ -34,14 +34,19 @@ https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#directives
 howto: https://docutils.sourceforge.io/docs/howto/rst-directives.html
 
 - document tree
+
   - created by a ``Parser`` component (i.e. from reStructuredText input)
   - manually constructed
+
 - ``docutils`` components
+
   - ``Reader``: Intended to obtain input and pass it to a ``Parser``.
   - ``Parser``: Generates a (docutils) document tree from a ``Reader`` input. docutils contains only a reStructuredText parser but potentially others may exists (e.g. markdown, html, etc.).
   - ``Writer``: Turns a document tree into an output (e.g. html, LaTeX).
+
 - other "pieces"
+
   - transforms: Called by a ``Parser`` for on-the-fly document tree manipulation.
   - visitors: Operate on an existing document tree (i.e. after parsing). Can collect various information and/or manipulate the document tree.
-  - roles: ???
-  - directives: ???
+  - roles: ??? https://docutils.sourceforge.io/docs/ref/rst/roles.html (see example that creates a custom ``date`` role as alternative to a ``date::`` directive https://docutils.sourceforge.io/docs/ref/rst/directives.html#date)
+  - directives: ???
diff --git a/xper_publisher_rst2html.py b/xper_publisher_rst2html.py
@@ -0,0 +1,50 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.io
+import docutils.core
+
+source = '''
+My title
+========
+
+1st paragraph
+
+2nd paragraph
+
+- a
+- b
+'''
+
+# using string input and output
+pub = docutils.core.Publisher(source_class=docutils.io.StringInput, destination_class=docutils.io.StringOutput)
+
+reader_name='standalone'
+parser_name='restructuredtext'
+writer_name='html'
+
+pub.set_components(reader_name, parser_name, writer_name)
+settings = pub.get_settings(); # populates the publisher default settings (from individual components)
+pub.set_source(source=source, source_path=''); # assign input source
+output = pub.publish()
+
+print(output)
diff --git a/xper_date_role.py b/xper_date_role.py
@@ -0,0 +1,66 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.frontend
+import docutils.utils
+import docutils.parsers
+import docutils.nodes
+import docutils.parsers.rst.roles
+
+
+def date_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
+    import datetime
+    node = docutils.nodes.inline(rawtext, datetime.datetime.today().strftime('%Y-%m-%d'), **options)
+    return [node], []
+
+docutils.parsers.rst.roles.register_local_role('date', date_role)
+
+settings = docutils.frontend.OptionParser().get_default_values()
+
+parser_class = docutils.parsers.get_parser_class('restructuredtext')
+parser = parser_class()
+
+option_parser = docutils.frontend.OptionParser(
+    components=(parser,),
+    read_config_files=True,
+    description='')
+
+settings = option_parser.parse_args()
+
+
+document = docutils.utils.new_document('', settings)
+
+text = '''
+My title
+========
+
+1st paragraph as of :date:`whatever` today
+
+2nd paragraph
+
+- a
+- b
+'''
+
+parser.parse(text, document)
+
+print(document.pformat())
diff --git a/xper_title_visitor.py b/xper_title_visitor.py
@@ -0,0 +1,178 @@
+#! /usr/bin/env python
+from orca.scripts import self_voicing
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.frontend
+import docutils.utils
+import docutils.parsers
+import docutils.nodes
+
+class TitleCollectVisitor(docutils.nodes.SparseNodeVisitor):
+
+    def __init__(self, document):
+        self.document = document
+        self.titles = {};
+
+    def visit_title(self,node):
+        lvl = self.get_sec_level(node.parent);
+        d = self.titles;
+        if lvl >= 0:
+            while lvl > 0:
+                d = d[list(d)[-1]];
+                lvl = lvl - 1;
+            d[node.astext()] = {};            
+
+    def get_sec_level(self, node):
+        """
+          There are three cases to consider (all are due to `frontmatter`
+          transform happening on the parsed input). First::
+
+              Title
+              =====
+
+              Subtitle
+              --------
+
+          which yields::
+
+              <document>
+                  <title>
+                  <subtitle>
+
+          Second::
+
+              Title
+              =====
+
+              Subtitle 1
+              ----------
+
+              Subtitle 2
+              ----------
+
+          which yields::
+
+              <document>
+                  <title>
+                  <section>
+                      <title>
+                  <section>
+                      <title>
+
+          And eventually third::
+
+              Title 1
+              =======
+
+              Subtitle 1
+              ----------
+
+              Title 2
+              =======
+
+          which yields::
+
+              <document>
+                  <section>
+                      <title>
+                      <section>
+                          <title>
+                  <section>
+                      <title>
+        """
+        if isinstance(node, docutils.nodes.document):
+            # This will be called for the 1st (`title` and `subtitle`) and
+            # 2nd case (`title` only)
+            return 0
+        elif isinstance(node, docutils.nodes.section):
+            # This will be called for the 2nd (`subtitle` only) and 3rd case.
+            # To distinguish the two, we need to see if the `document` node
+            # contains a `title` child.
+            i=0
+            while node==None or not isinstance(node, docutils.nodes.document):
+                node = node.parent
+                i += 1
+            if isinstance(node, docutils.nodes.document):
+                hastitle = 0
+                for c in node.children:
+                    if isinstance(c, docutils.nodes.title):
+                        hastitle = 1
+                        break
+                if not hastitle:
+                    i -= 1
+            return i
+        else:
+            return -1
+
+    def print_titles(self, d=None, indent=''):
+        if d is None:
+            d = self.titles;
+
+        for (k,v) in d.items():
+            print(f"{indent}- {k}");
+            self.print_titles(v, indent + '  ');
+
+settings = docutils.frontend.OptionParser().get_default_values()
+
+parser_class = docutils.parsers.get_parser_class('restructuredtext')
+parser = parser_class()
+
+option_parser = docutils.frontend.OptionParser(
+    components=(parser,),
+    read_config_files=True,
+    description='')
+
+settings = option_parser.parse_args()
+
+
+document = docutils.utils.new_document('', settings)
+
+text = '''
+My title
+========
+
+1st paragraph
+
+1st Subtitle
+------------
+
+2nd paragraph
+
+1st SubSubtitle
+...............
+
+2nd SubSubtitle
+...............
+
+2nd Subtitle
+------------
+
+- a
+- b
+'''
+
+parser.parse(text, document)
+
+visitor = TitleCollectVisitor(document)
+document.walkabout(visitor)
+
+visitor.print_titles()
diff --git a/custom_rst_directives.rst b/custom_rst_directives.rst
@@ -33,3 +33,15 @@ https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#directives
 
 howto: https://docutils.sourceforge.io/docs/howto/rst-directives.html
 
+- document tree
+  - created by a ``Parser`` component (i.e. from reStructuredText input)
+  - manually constructed
+- ``docutils`` components
+  - ``Reader``: Intended to obtain input and pass it to a ``Parser``.
+  - ``Parser``: Generates a (docutils) document tree from a ``Reader`` input. docutils contains only a reStructuredText parser but potentially others may exists (e.g. markdown, html, etc.).
+  - ``Writer``: Turns a document tree into an output (e.g. html, LaTeX).
+- other "pieces"
+  - transforms: Called by a ``Parser`` for on-the-fly document tree manipulation.
+  - visitors: Operate on an existing document tree (i.e. after parsing). Can collect various information and/or manipulate the document tree.
+  - roles: ???
+  - directives: ???
diff --git a/custom_rst_directives.rst b/custom_rst_directives.rst
@@ -30,3 +30,6 @@ Examples::
      * other directives
 
 https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#directives
+
+howto: https://docutils.sourceforge.io/docs/howto/rst-directives.html
+
diff --git a/xper_inline_text_construct.py b/xper_inline_text_construct.py
@@ -0,0 +1,56 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.frontend
+import docutils.utils
+import docutils.parsers
+
+settings = docutils.frontend.OptionParser().get_default_values()
+
+parser_class = docutils.parsers.get_parser_class('restructuredtext')
+parser = parser_class()
+
+option_parser = docutils.frontend.OptionParser(
+    components=(parser,),
+    read_config_files=True,
+    description='')
+
+settings = option_parser.parse_args()
+
+
+document = docutils.utils.new_document('', settings)
+
+text = '''
+My title
+========
+
+1st paragraph
+
+2nd paragraph
+
+- a
+- b
+'''
+
+parser.parse(text, document)
+
+print(document.pformat())
diff --git a/xper_manual_doc_construct.py b/xper_manual_doc_construct.py
@@ -0,0 +1,42 @@
+#! /usr/bin/env python
+
+# Copyright 2024 Tomas Brabec
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+try:
+    import locale
+    locale.setlocale(locale.LC_ALL, '')
+except:
+    pass
+
+import docutils.utils
+
+document = docutils.utils.new_document('', None)
+
+document += docutils.nodes.title(text='My title');
+document += docutils.nodes.paragraph(text='1st paragraph');
+document += docutils.nodes.paragraph(text='2nd paragraph');
+
+node = docutils.nodes.bullet_list();
+node['bullet'] = '-';
+subnode = docutils.nodes.list_item('');
+subnode += docutils.nodes.paragraph(text='a');
+node += subnode;
+subnode = docutils.nodes.list_item('');
+subnode += docutils.nodes.paragraph(text='b');
+node += subnode;
+
+document += node;
+
+print(document.pformat())
diff --git a/custom_rst_directives.rst b/custom_rst_directives.rst
@@ -10,4 +10,23 @@ Directives have the following syntax::
   +-------+ block                         |
           |                               |
           +-------------------------------+
-          
+
+Examples::
+
+  .. image:: /path/to/image.png
+  
+  .. figure:: /path/to/image.png
+     :width: 600px
+  
+  .. note:: This is the note's 1st paragraph
+     that spans multiple lines.
+  
+     This the note's 2nd paragraph.
+     
+     Notes are general blocks and can embed usual markup elements:
+     
+     * text elements with inline markup
+     * list elements
+     * other directives
+
+https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#directives
diff --git a/custom_admonition_processing.py → impl_custom_admonition_processing.py b/custom_admonition_processing.py → impl_custom_admonition_processing.py
diff --git a/custom_directive_processing.py → impl_custom_directive_processing.py b/custom_directive_processing.py → impl_custom_directive_processing.py
diff --git a/custom_admonition_processing.py b/custom_admonition_processing.py
@@ -0,0 +1,12 @@
+import docutils
+from docutils.parsers.rst.directives.admonitions import BaseAdmonition
+
+# this is merely to specifically identify elements derived
+# from the `my_extension` directive
+class myadmonition(docutils.nodes.Admonition, docutils.nodes.Element): pass
+
+class MyExtensionAdmonition(BaseAdmonition):
+    node_class = myadmonition;
+
+# This overrides what directive class will be used to process the `my_extension` directive
+directives._directives['my_extension'] = MyExtensionAdmonition;
diff --git a/custom_directive_processing.py b/custom_directive_processing.py
@@ -0,0 +1,41 @@
+import docutils
+
+# this is merely to specifically identify elements derived
+# from the `my_extension` directive
+class mydirective(docutils.nodes.Element): pass
+
+class MyExtensionDirective(docutils.parsers.rst.Directive):
+    required_arguments = 1;
+    optional_arguments = 0;
+    final_argument_whitespace = True;
+    has_content = True;
+
+    def run(self):
+        self.assert_has_content()
+        text = '\n'.join(self.content)
+        n = mydirective(text, **self.options)
+        self.add_name(n)
+
+        # this will turn the directive argument into a title node
+        # (as we generally allow the title to contain inline markup,
+        # we use the inline parser to get (`textnodes`) list of inline
+        # elements/nodes)
+        title_text = self.arguments[0]
+        textnodes, messages = self.state.inline_text(title_text,
+                                                     self.lineno)
+        # the following would end up calling TextElement(rawsource,text,*children) constructor
+        title = docutils.nodes.title(title_text, '', *textnodes)
+        title.source, title.line = (
+                self.state_machine.get_source_and_line(self.lineno))
+
+        # add a new sub-node and any system messages from the inline parsing
+        n += title
+        n += messages
+
+        # This will parse the directive content
+        self.state.nested_parse(self.content, self.content_offset,
+                                n)
+        return [n]
+
+# This overrides what directive class will be used to process the `my_extension` directive
+directives._directives['my_extension'] = MyExtensionDirective;
diff --git a/custom_rst_directives.rst b/custom_rst_directives.rst
@@ -0,0 +1,13 @@
+Custom Directives in reStructuredText (rst)
+===========================================
+
+https://docutils.sourceforge.io/docs/ref/rst/directives.html
+
+Directives have the following syntax::
+
+  +-------+-------------------------------+
+  | ".. " | directive type "::" directive |
+  +-------+ block                         |
+          |                               |
+          +-------------------------------+
+
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