avoid additional requirement for building docs

DocImpact

Change-Id: I2d4dda2ee6fdfcf82702f4400a2513e7aa83957d
closes-bug: 1551292

3 files changed, 525 insertions, 1 deletions

diff --git a/doc/ext/cli.py b/doc/ext/cli.py
index c9d860f..feb28d7 100644
--- a/doc/ext/cli.py
+++ b/doc/ext/cli.py
@@ -19,7 +19,7 @@ import os
 import sys
 
 from docutils import nodes
-from sphinxarg import ext
+from . import ext
 
 
 def _get_command(classes):
diff --git a/doc/ext/ext.py b/doc/ext/ext.py
new file mode 100644
index 0000000..9b07ab1
--- /dev/null
+++ b/doc/ext/ext.py
@@ -0,0 +1,386 @@
+# Copyright (c) 2013 Alex Rudakov
+#
+# 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.
+
+from argparse import ArgumentParser
+import os
+
+from docutils import nodes
+from docutils.statemachine import StringList
+from docutils.parsers.rst.directives import flag, unchanged
+from sphinx.util.compat import Directive
+from sphinx.util.nodes import nested_parse_with_titles
+
+from .parser import parse_parser, parser_navigate
+
+
+def map_nested_definitions(nested_content):
+    if nested_content is None:
+        raise Exception('Nested content should be iterable, not null')
+    # build definition dictionary
+    definitions = {}
+    for item in nested_content:
+        if not isinstance(item, nodes.definition_list):
+            continue
+        for subitem in item:
+            if not isinstance(subitem, nodes.definition_list_item):
+                continue
+            if not len(subitem.children) > 0:
+                continue
+            classifier = '@after'
+            idx = subitem.first_child_matching_class(nodes.classifier)
+            if idx is not None:
+                ci = subitem[idx]
+                if len(ci.children) > 0:
+                    classifier = ci.children[0].astext()
+            if classifier is not None and classifier not in (
+                    '@replace', '@before', '@after'):
+                raise Exception('Unknown classifier: %s' % classifier)
+            idx = subitem.first_child_matching_class(nodes.term)
+            if idx is not None:
+                ch = subitem[idx]
+                if len(ch.children) > 0:
+                    term = ch.children[0].astext()
+                    idx = subitem.first_child_matching_class(nodes.definition)
+                    if idx is not None:
+                        def_node = subitem[idx]
+                        def_node.attributes['classifier'] = classifier
+                        definitions[term] = def_node
+    return definitions
+
+
+def print_arg_list(data, nested_content):
+    definitions = map_nested_definitions(nested_content)
+    items = []
+    if 'args' in data:
+        for arg in data['args']:
+            my_def = [nodes.paragraph(text=arg['help'])] if arg['help'] else []
+            name = arg['name']
+            my_def = apply_definition(definitions, my_def, name)
+            if len(my_def) == 0:
+                my_def.append(nodes.paragraph(text='Undocumented'))
+            if 'choices' in arg:
+                my_def.append(nodes.paragraph(
+                    text=('Possible choices: %s' % ', '.join([str(c) for c in arg['choices']]))))
+            items.append(
+                nodes.option_list_item(
+                    '', nodes.option_group('', nodes.option_string(text=name)),
+                    nodes.description('', *my_def)))
+    return nodes.option_list('', *items) if items else None
+
+
+def print_opt_list(data, nested_content):
+    definitions = map_nested_definitions(nested_content)
+    items = []
+    if 'options' in data:
+        for opt in data['options']:
+            names = []
+            my_def = [nodes.paragraph(text=opt['help'])] if opt['help'] else []
+            for name in opt['name']:
+                option_declaration = [nodes.option_string(text=name)]
+                if opt['default'] is not None \
+                        and opt['default'] != '==SUPPRESS==':
+                    option_declaration += nodes.option_argument(
+                        '', text='=' + str(opt['default']))
+                names.append(nodes.option('', *option_declaration))
+                my_def = apply_definition(definitions, my_def, name)
+            if len(my_def) == 0:
+                my_def.append(nodes.paragraph(text='Undocumented'))
+            if 'choices' in opt:
+                my_def.append(nodes.paragraph(
+                    text=('Possible choices: %s' % ', '.join([str(c) for c in opt['choices']]))))
+            items.append(
+                nodes.option_list_item(
+                    '', nodes.option_group('', *names),
+                    nodes.description('', *my_def)))
+    return nodes.option_list('', *items) if items else None
+
+
+def print_command_args_and_opts(arg_list, opt_list, sub_list=None):
+    items = []
+    if arg_list:
+        items.append(nodes.definition_list_item(
+            '', nodes.term(text='Positional arguments:'),
+            nodes.definition('', arg_list)))
+    if opt_list:
+        items.append(nodes.definition_list_item(
+            '', nodes.term(text='Options:'),
+            nodes.definition('', opt_list)))
+    if sub_list and len(sub_list):
+        items.append(nodes.definition_list_item(
+            '', nodes.term(text='Sub-commands:'),
+            nodes.definition('', sub_list)))
+    return nodes.definition_list('', *items)
+
+
+def apply_definition(definitions, my_def, name):
+    if name in definitions:
+        definition = definitions[name]
+        classifier = definition['classifier']
+        if classifier == '@replace':
+            return definition.children
+        if classifier == '@after':
+            return my_def + definition.children
+        if classifier == '@before':
+            return definition.children + my_def
+        raise Exception('Unknown classifier: %s' % classifier)
+    return my_def
+
+
+def print_subcommand_list(data, nested_content):
+    definitions = map_nested_definitions(nested_content)
+    items = []
+    if 'children' in data:
+        for child in data['children']:
+            my_def = [nodes.paragraph(
+                text=child['help'])] if child['help'] else []
+            name = child['name']
+            my_def = apply_definition(definitions, my_def, name)
+            if len(my_def) == 0:
+                my_def.append(nodes.paragraph(text='Undocumented'))
+            if 'description' in child:
+                my_def.append(nodes.paragraph(text=child['description']))
+            my_def.append(nodes.literal_block(text=child['usage']))
+            my_def.append(print_command_args_and_opts(
+                print_arg_list(child, nested_content),
+                print_opt_list(child, nested_content),
+                print_subcommand_list(child, nested_content)
+            ))
+            items.append(
+                nodes.definition_list_item(
+                    '',
+                    nodes.term('', '', nodes.strong(text=name)),
+                    nodes.definition('', *my_def)
+                )
+            )
+    return nodes.definition_list('', *items)
+
+
+class ArgParseDirective(Directive):
+    has_content = True
+    option_spec = dict(module=unchanged, func=unchanged, ref=unchanged,
+                       prog=unchanged, path=unchanged, nodefault=flag,
+                       manpage=unchanged, nosubcommands=unchanged, passparser=flag)
+
+    def _construct_manpage_specific_structure(self, parser_info):
+        """
+        Construct a typical man page consisting of the following elements:
+            NAME (automatically generated, out of our control)
+            SYNOPSIS
+            DESCRIPTION
+            OPTIONS
+            FILES
+            SEE ALSO
+            BUGS
+        """
+        # SYNOPSIS section
+        synopsis_section = nodes.section(
+            '',
+            nodes.title(text='Synopsis'),
+            nodes.literal_block(text=parser_info["bare_usage"]),
+            ids=['synopsis-section'])
+        # DESCRIPTION section
+        description_section = nodes.section(
+            '',
+            nodes.title(text='Description'),
+            nodes.paragraph(text=parser_info.get(
+                'description', parser_info.get(
+                    'help', "undocumented").capitalize())),
+            ids=['description-section'])
+        nested_parse_with_titles(
+            self.state, self.content, description_section)
+        if parser_info.get('epilog'):
+            # TODO: do whatever sphinx does to understand ReST inside
+            # docstrings magically imported from other places. The nested
+            # parse method invoked above seem to be able to do this but
+            # I haven't found a way to do it for arbitrary text
+            description_section += nodes.paragraph(
+                text=parser_info['epilog'])
+        # OPTIONS section
+        options_section = nodes.section(
+            '',
+            nodes.title(text='Options'),
+            ids=['options-section'])
+        if 'args' in parser_info:
+            options_section += nodes.paragraph()
+            options_section += nodes.subtitle(text='Positional arguments:')
+            options_section += self._format_positional_arguments(parser_info)
+        if 'options' in parser_info:
+            options_section += nodes.paragraph()
+            options_section += nodes.subtitle(text='Optional arguments:')
+            options_section += self._format_optional_arguments(parser_info)
+        items = [
+            # NOTE: we cannot generate NAME ourselves. It is generated by
+            # docutils.writers.manpage
+            synopsis_section,
+            description_section,
+            # TODO: files
+            # TODO: see also
+            # TODO: bugs
+        ]
+        if len(options_section.children) > 1:
+            items.append(options_section)
+        if 'nosubcommands' not in self.options:
+            # SUBCOMMANDS section (non-standard)
+            subcommands_section = nodes.section(
+                '',
+                nodes.title(text='Sub-Commands'),
+                ids=['subcommands-section'])
+            if 'children' in parser_info:
+                subcommands_section += self._format_subcommands(parser_info)
+            if len(subcommands_section) > 1:
+                items.append(subcommands_section)
+        if os.getenv("INCLUDE_DEBUG_SECTION"):
+            import json
+            # DEBUG section (non-standard)
+            debug_section = nodes.section(
+                '',
+                nodes.title(text="Argparse + Sphinx Debugging"),
+                nodes.literal_block(text=json.dumps(parser_info, indent='  ')),
+                ids=['debug-section'])
+            items.append(debug_section)
+        return items
+
+    def _format_positional_arguments(self, parser_info):
+        assert 'args' in parser_info
+        items = []
+        for arg in parser_info['args']:
+            arg_items = []
+            if arg['help']:
+                arg_items.append(nodes.paragraph(text=arg['help']))
+            else:
+                arg_items.append(nodes.paragraph(text='Undocumented'))
+            if 'choices' in arg:
+                arg_items.append(
+                    nodes.paragraph(
+                        text='Possible choices: ' + ', '.join(arg['choices'])))
+            items.append(
+                nodes.option_list_item(
+                    '',
+                    nodes.option_group(
+                        '', nodes.option(
+                            '', nodes.option_string(text=arg['metavar'])
+                        )
+                    ),
+                    nodes.description('', *arg_items)))
+        return nodes.option_list('', *items)
+
+    def _format_optional_arguments(self, parser_info):
+        assert 'options' in parser_info
+        items = []
+        for opt in parser_info['options']:
+            names = []
+            opt_items = []
+            for name in opt['name']:
+                option_declaration = [nodes.option_string(text=name)]
+                if opt['default'] is not None \
+                        and opt['default'] != '==SUPPRESS==':
+                    option_declaration += nodes.option_argument(
+                        '', text='=' + str(opt['default']))
+                names.append(nodes.option('', *option_declaration))
+            if opt['help']:
+                opt_items.append(nodes.paragraph(text=opt['help']))
+            else:
+                opt_items.append(nodes.paragraph(text='Undocumented'))
+            if 'choices' in opt:
+                opt_items.append(
+                    nodes.paragraph(
+                        text='Possible choices: ' + ', '.join(opt['choices'])))
+            items.append(
+                nodes.option_list_item(
+                    '', nodes.option_group('', *names),
+                    nodes.description('', *opt_items)))
+        return nodes.option_list('', *items)
+
+    def _format_subcommands(self, parser_info):
+        assert 'children' in parser_info
+        items = []
+        for subcmd in parser_info['children']:
+            subcmd_items = []
+            if subcmd['help']:
+                subcmd_items.append(nodes.paragraph(text=subcmd['help']))
+            else:
+                subcmd_items.append(nodes.paragraph(text='Undocumented'))
+            items.append(
+                nodes.definition_list_item(
+                    '',
+                    nodes.term('', '', nodes.strong(
+                        text=subcmd['bare_usage'])),
+                    nodes.definition('', *subcmd_items)))
+        return nodes.definition_list('', *items)
+
+    def _nested_parse_paragraph(self, text):
+        content = nodes.paragraph()
+        self.state.nested_parse(StringList(text.split("\n")), 0, content)
+        return content
+
+    def run(self):
+        if 'module' in self.options and 'func' in self.options:
+            module_name = self.options['module']
+            attr_name = self.options['func']
+        elif 'ref' in self.options:
+            _parts = self.options['ref'].split('.')
+            module_name = '.'.join(_parts[0:-1])
+            attr_name = _parts[-1]
+        else:
+            raise self.error(
+                ':module: and :func: should be specified, or :ref:')
+        mod = __import__(module_name, globals(), locals(), [attr_name])
+        if not hasattr(mod, attr_name):
+            raise self.error((
+                'Module "%s" has no attribute "%s"\n'
+                'Incorrect argparse :module: or :func: values?'
+            ) % (module_name, attr_name))
+        func = getattr(mod, attr_name)
+        if isinstance(func, ArgumentParser):
+            parser = func
+        elif 'passparser' in self.options:
+            parser = ArgumentParser()
+            func(parser)
+        else:
+            parser = func()
+        if 'path' not in self.options:
+            self.options['path'] = ''
+        path = str(self.options['path'])
+        if 'prog' in self.options:
+            parser.prog = self.options['prog']
+        result = parse_parser(
+            parser, skip_default_values='nodefault' in self.options)
+        result = parser_navigate(result, path)
+        if 'manpage' in self.options:
+            return self._construct_manpage_specific_structure(result)
+        nested_content = nodes.paragraph()
+        self.state.nested_parse(
+            self.content, self.content_offset, nested_content)
+        nested_content = nested_content.children
+        items = []
+        # add common content between
+        for item in nested_content:
+            if not isinstance(item, nodes.definition_list):
+                items.append(item)
+        if 'description' in result:
+            items.append(self._nested_parse_paragraph(result['description']))
+        items.append(nodes.literal_block(text=result['usage']))
+        items.append(print_command_args_and_opts(
+            print_arg_list(result, nested_content),
+            print_opt_list(result, nested_content),
+            print_subcommand_list(result, nested_content)
+        ))
+        if 'epilog' in result:
+            items.append(self._nested_parse_paragraph(result['epilog']))
+        return items
+
+
+def setup(app):
+    app.add_directive('argparse', ArgParseDirective)
\ No newline at end of file
diff --git a/doc/ext/parser.py b/doc/ext/parser.py
new file mode 100644
index 0000000..fbb8feb
--- /dev/null
+++ b/doc/ext/parser.py
@@ -0,0 +1,138 @@
+# Copyright (c) 2013 Alex Rudakov
+#
+# 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.
+
+from argparse import _HelpAction, _SubParsersAction
+import re
+
+
+class NavigationException(Exception):
+    pass
+
+
+def parser_navigate(parser_result, path, current_path=None):
+    if isinstance(path, str):
+        if path == '':
+            return parser_result
+        path = re.split('\s+', path)
+    current_path = current_path or []
+    if len(path) == 0:
+        return parser_result
+    if 'children' not in parser_result:
+        raise NavigationException(
+            'Current parser have no children elements.  (path: %s)' %
+            ' '.join(current_path))
+    next_hop = path.pop(0)
+    for child in parser_result['children']:
+        if child['name'] == next_hop:
+            current_path.append(next_hop)
+            return parser_navigate(child, path, current_path)
+    raise NavigationException(
+        'Current parser have no children element with name: %s  (path: %s)' % (
+            next_hop, ' '.join(current_path)))
+
+
+def _try_add_parser_attribute(data, parser, attribname):
+    attribval = getattr(parser, attribname, None)
+    if attribval is None:
+        return
+    if not isinstance(attribval, str):
+        return
+    if len(attribval) > 0:
+        data[attribname] = attribval
+
+
+def _format_usage_without_prefix(parser):
+    """
+    Use private argparse APIs to get the usage string without
+    the 'usage: ' prefix.
+    """
+    fmt = parser._get_formatter()
+    fmt.add_usage(parser.usage, parser._actions,
+                  parser._mutually_exclusive_groups, prefix='')
+    return fmt.format_help().strip()
+
+
+def parse_parser(parser, data=None, **kwargs):
+    if data is None:
+        data = {
+            'name': '',
+            'usage': parser.format_usage().strip(),
+            'bare_usage': _format_usage_without_prefix(parser),
+            'prog': parser.prog,
+        }
+    _try_add_parser_attribute(data, parser, 'description')
+    _try_add_parser_attribute(data, parser, 'epilog')
+    for action in parser._get_positional_actions():
+        if isinstance(action, _HelpAction):
+            continue
+        if isinstance(action, _SubParsersAction):
+            helps = {}
+            for item in action._choices_actions:
+                helps[item.dest] = item.help
+
+            # commands which share an existing parser are an alias,
+            # don't duplicate docs
+            subsection_alias = {}
+            subsection_alias_names = set()
+            for name, subaction in action._name_parser_map.items():
+                if subaction not in subsection_alias:
+                    subsection_alias[subaction] = []
+                else:
+                    subsection_alias[subaction].append(name)
+                    subsection_alias_names.add(name)
+
+            for name, subaction in action._name_parser_map.items():
+                if name in subsection_alias_names:
+                    continue
+                subalias = subsection_alias[subaction]
+                subaction.prog = '%s %s' % (parser.prog, name)
+                subdata = {
+                    'name': name if not subalias else
+                            '%s (%s)' % (name, ', '.join(subalias)),
+                    'help': helps.get(name, ''),
+                    'usage': subaction.format_usage().strip(),
+                    'bare_usage': _format_usage_without_prefix(subaction),
+                }
+                parse_parser(subaction, subdata, **kwargs)
+                data.setdefault('children', []).append(subdata)
+            continue
+        if 'args' not in data:
+            data['args'] = []
+        arg = {
+            'name': action.dest,
+            'help': action.help or '',
+            'metavar': action.metavar
+        }
+        if action.choices:
+            arg['choices'] = action.choices
+        data['args'].append(arg)
+    show_defaults = (
+        ('skip_default_values' not in kwargs)
+        or (kwargs['skip_default_values'] is False))
+    for action in parser._get_optional_actions():
+        if isinstance(action, _HelpAction):
+            continue
+        if 'options' not in data:
+            data['options'] = []
+        option = {
+            'name': action.option_strings,
+            'default': action.default if show_defaults else '==SUPPRESS==',
+            'help': action.help or ''
+        }
+        if action.choices:
+            option['choices'] = action.choices
+        if "==SUPPRESS==" not in option['help']:
+            data['options'].append(option)
+    return data