--- /dev/null
+# Copyright (C) 2016 Sebastian Wiesner and Flycheck contributors
+
+# This file is not part of GNU Emacs.
+
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+# details.
+
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+from collections import namedtuple
+from sphinx import addnodes
+from sphinx.util import ws_re
+from sphinx.roles import XRefRole
+from sphinx.domains import Domain, ObjType
+from sphinx.util.nodes import make_refnode
+from sphinx.directives import ObjectDescription
+
+
+def make_target(cell, name):
+ """Create a target name from ``cell`` and ``name``.
+
+ ``cell`` is the name of a symbol cell, and ``name`` is a symbol name, both
+ as strings.
+
+ The target names are used as cross-reference targets for Sphinx.
+
+ """
+ return '{cell}-{name}'.format(cell=cell, name=name)
+
+
+def to_mode_name(symbol_name):
+ """Convert ``symbol_name`` to a mode name.
+
+ Split at ``-`` and titlecase each part.
+
+ """
+ return ' '.join(p.title() for p in symbol_name.split('-'))
+
+
+class Cell(namedtuple('Cell', 'objtype docname')):
+ """A cell in a symbol.
+
+ A cell holds the object type and the document name of the description for
+ the cell.
+
+ Cell objects are used within symbol entries in the domain data.
+
+ """
+
+ pass
+
+
+class KeySequence(namedtuple('KeySequence', 'keys')):
+ """A key sequence."""
+
+ PREFIX_KEYS = {'C-u'}
+ PREFIX_KEYS.update('M-{}'.format(n) for n in range(10))
+
+ @classmethod
+ def fromstring(cls, s):
+ return cls(s.split())
+
+ @property
+ def command_name(self):
+ """The command name in this key sequence.
+
+ Return ``None`` for key sequences that are no command invocations with
+ ``M-x``.
+
+ """
+ try:
+ return self.keys[self.keys.index('M-x') + 1]
+ except ValueError:
+ return None
+
+ @property
+ def has_prefix(self):
+ """Whether this key sequence has a prefix."""
+ return self.keys[0] in self.PREFIX_KEYS
+
+ def __str__(self):
+ return ' '.join(self.keys)
+
+
+class EmacsLispSymbol(ObjectDescription):
+ """An abstract base class for directives documenting symbols.
+
+ Provide target and index generation and registration of documented symbols
+ within the domain data.
+
+ Deriving classes must have a ``cell`` attribute which refers to the cell
+ the documentation goes in, and a ``label`` attribute which provides a
+ human-readable name for what is documented, used in the index entry.
+
+ """
+
+ cell_for_objtype = {
+ 'defcustom': 'variable',
+ 'defconst': 'variable',
+ 'defvar': 'variable',
+ 'defface': 'face'
+ }
+
+ @property
+ def cell(self):
+ """The cell in which to store symbol metadata."""
+ return self.cell_for_objtype[self.objtype]
+
+ @property
+ def label(self):
+ """The label for the documented object type."""
+ return self.objtype
+
+ def handle_signature(self, signature, signode):
+ """Create nodes in ``signode`` for the ``signature``.
+
+ ``signode`` is a docutils node to which to add the nodes, and
+ ``signature`` is the symbol name.
+
+ Add the object type label before the symbol name and return
+ ``signature``.
+
+ """
+ label = self.label + ' '
+ signode += addnodes.desc_annotation(label, label)
+ signode += addnodes.desc_name(signature, signature)
+ return signature
+
+ def _add_index(self, name, target):
+ index_text = '{name}; {label}'.format(
+ name=name, label=self.label)
+ self.indexnode['entries'].append(
+ ('pair', index_text, target, '', None))
+
+ def _add_target(self, name, sig, signode):
+ target = make_target(self.cell, name)
+ if target not in self.state.document.ids:
+ signode['names'].append(name)
+ signode['ids'].append(target)
+ signode['first'] = (not self.names)
+ self.state.document.note_explicit_target(signode)
+
+ obarray = self.env.domaindata['el']['obarray']
+ symbol = obarray.setdefault(name, {})
+ if self.cell in symbol:
+ self.state_machine.reporter.warning(
+ 'duplicate description of %s %s, ' % (self.objtype, name)
+ + 'other instance in '
+ + self.env.doc2path(symbol[self.cell].docname),
+ line=self.lineno)
+ symbol[self.cell] = Cell(self.objtype, self.env.docname)
+
+ return target
+
+ def add_target_and_index(self, name, sig, signode):
+ target = self._add_target(name, sig, signode)
+ self._add_index(name, target)
+
+
+class EmacsLispMinorMode(EmacsLispSymbol):
+ cell = 'function'
+ label = 'Minor Mode'
+
+ def handle_signature(self, signature, signode):
+ """Create nodes in ``signode`` for the ``signature``.
+
+ ``signode`` is a docutils node to which to add the nodes, and
+ ``signature`` is the symbol name.
+
+ Add the object type label before the symbol name and return
+ ``signature``.
+
+ """
+ label = self.label + ' '
+ signode += addnodes.desc_annotation(label, label)
+ signode += addnodes.desc_name(signature, to_mode_name(signature))
+ return signature
+
+ def _add_index(self, name, target):
+ return super()._add_index(to_mode_name(name), target)
+
+
+class EmacsLispFunction(EmacsLispSymbol):
+ """A directive to document Emacs Lisp functions."""
+
+ cell_for_objtype = {
+ 'defun': 'function',
+ 'defmacro': 'function'
+ }
+
+ def handle_signature(self, signature, signode):
+ function_name, *args = ws_re.split(signature)
+ label = self.label + ' '
+ signode += addnodes.desc_annotation(label, label)
+ signode += addnodes.desc_name(function_name, function_name)
+ for arg in args:
+ is_keyword = arg.startswith('&')
+ node = (addnodes.desc_annotation
+ if is_keyword
+ else addnodes.desc_addname)
+ signode += node(' ' + arg, ' ' + arg)
+
+ return function_name
+
+
+class EmacsLispKey(ObjectDescription):
+ """A directive to document interactive commands via their bindings."""
+
+ label = 'Interactive command'
+
+ def handle_signature(self, signature, signode):
+ """Create nodes to ``signode`` for ``signature``.
+
+ ``signode`` is a docutils node to which to add the nodes, and
+ ``signature`` is the symbol name.
+ """
+ key_sequence = KeySequence.fromstring(signature)
+ signode += addnodes.desc_name(signature, str(key_sequence))
+ return str(key_sequence)
+
+ def _add_command_target_and_index(self, name, sig, signode):
+ target_name = make_target('function', name)
+ if target_name not in self.state.document.ids:
+ signode['names'].append(name)
+ signode['ids'].append(target_name)
+ self.state.document.note_explicit_target(signode)
+
+ obarray = self.env.domaindata['el']['obarray']
+ symbol = obarray.setdefault(name, {})
+ if 'function' in symbol:
+ self.state_machine.reporter.warning(
+ 'duplicate description of %s %s, ' % (self.objtype, name)
+ + 'other instance in '
+ + self.env.doc2path(symbol['function'].docname),
+ line=self.lineno)
+ symbol['function'] = Cell(self.objtype, self.env.docname)
+
+ index_text = '{name}; {label}'.format(name=name, label=self.label)
+ self.indexnode['entries'].append(
+ ('pair', index_text, target_name, '', None))
+
+ def _add_binding_target_and_index(self, binding, sig, signode):
+ reftarget = make_target('key', binding)
+
+ if reftarget not in self.state.document.ids:
+ signode['names'].append(reftarget)
+ signode['ids'].append(reftarget)
+ signode['first'] = (not self.names)
+ self.state.document.note_explicit_target(signode)
+
+ keymap = self.env.domaindata['el']['keymap']
+ if binding in keymap:
+ self.state_machine.reporter.warning(
+ 'duplicate description of binding %s, ' % binding
+ + 'other instance in '
+ + self.env.doc2path(keymap[binding]),
+ line=self.lineno)
+ keymap[binding] = self.env.docname
+
+ index_text = '{name}; key binding'.format(name=binding)
+ self.indexnode['entries'].append(
+ ('pair', index_text, reftarget, '', None))
+
+ def add_target_and_index(self, name, sig, signode):
+ # If unprefixed M-x command index as function and not as key binding
+ sequence = KeySequence.fromstring(name)
+ if sequence.command_name and not sequence.has_prefix:
+ self._add_command_target_and_index(sequence.command_name,
+ sig, signode)
+ else:
+ self._add_binding_target_and_index(name, sig, signode)
+
+
+class XRefModeRole(XRefRole):
+ """A role to cross-reference a minor mode.
+
+ Like a normal cross-reference role but appends ``-mode`` to the reference
+ target and title-cases the symbol name like Emacs does when referring to
+ modes.
+
+ """
+
+ fix_parens = False
+ lowercase = False
+
+ def process_link(self, env, refnode, has_explicit_title, title, target):
+ refnode['reftype'] = 'minor-mode'
+ target = target + '-mode'
+ return (title if has_explicit_title else to_mode_name(target), target)
+
+
+class EmacsLispDomain(Domain):
+ """A domain to document Emacs Lisp code."""
+
+ name = 'el'
+ label = 'Emacs Lisp'
+
+ object_types = {
+ # TODO: Set search prio for object types
+ # Types for user-facing options and commands
+ 'minor-mode': ObjType('minor-mode', 'function', 'mode',
+ cell='function'),
+ 'define-key': ObjType('key binding', cell='interactive'),
+ 'defcustom': ObjType('defcustom', 'defcustom', cell='variable'),
+ 'defface': ObjType('defface', 'defface', cell='face'),
+ # Object types for code
+ 'defun': ObjType('defun', 'defun', cell='function'),
+ 'defmacro': ObjType('defmacro', 'defmacro', cell='function'),
+ 'defvar': ObjType('defvar', 'defvar', cell='variable'),
+ 'defconst': ObjType('defconst', 'defconst', cell='variable')
+ }
+ directives = {
+ 'minor-mode': EmacsLispMinorMode,
+ 'define-key': EmacsLispKey,
+ 'defcustom': EmacsLispSymbol,
+ 'defvar': EmacsLispSymbol,
+ 'defconst': EmacsLispSymbol,
+ 'defface': EmacsLispSymbol,
+ 'defun': EmacsLispFunction,
+ 'defmacro': EmacsLispFunction
+ }
+ roles = {
+ 'mode': XRefModeRole(),
+ 'defvar': XRefRole(),
+ 'defconst': XRefRole(),
+ 'defcustom': XRefRole(),
+ 'defface': XRefRole(),
+ 'defun': XRefRole(),
+ 'defmacro': XRefRole()
+ }
+
+ data_version = 1
+ initial_data = {
+ # Our domain data attempts to somewhat mirror the semantics of Emacs
+ # Lisp, so we have an obarray which holds symbols which in turn have
+ # function, variable, face, etc. cells, and a keymap which holds the
+ # documentation for key bindings.
+ 'obarray': {},
+ 'keymap': {}
+ }
+
+ def clear_doc(self, docname):
+ """Clear all cells documented ``docname``."""
+ for symbol in self.data['obarray'].values():
+ for cell in list(symbol.keys()):
+ if docname == symbol[cell].docname:
+ del symbol[cell]
+ for binding in list(self.data['keymap']):
+ if self.data['keymap'][binding] == docname:
+ del self.data['keymap'][binding]
+
+ def resolve_xref(self, env, fromdocname, builder,
+ objtype, target, node, contnode):
+ """Resolve a cross reference to ``target``."""
+ if objtype == 'key':
+ todocname = self.data['keymap'].get(target)
+ if not todocname:
+ return None
+ reftarget = make_target('key', target)
+ else:
+ cell = self.object_types[objtype].attrs['cell']
+ symbol = self.data['obarray'].get(target, {})
+ if cell not in symbol:
+ return None
+ reftarget = make_target(cell, target)
+ todocname = symbol[cell].docname
+
+ return make_refnode(builder, fromdocname, todocname,
+ reftarget, contnode, target)
+
+ def resolve_any_xref(self, env, fromdocname, builder,
+ target, node, contnode):
+ """Return all possible cross references for ``target``."""
+ nodes = ((objtype, self.resolve_xref(env, fromdocname, builder,
+ objtype, target, node, contnode))
+ for objtype in ['key', 'defun', 'defvar', 'defface'])
+ return [('el:{}'.format(objtype), node) for (objtype, node) in nodes
+ if node is not None]
+
+ def merge_warn_duplicate(self, objname, our_docname, their_docname):
+ self.env.warn(
+ their_docname,
+ "Duplicate declaration: '{}' also defined in '{}'.\n".format(
+ objname, their_docname))
+
+ def merge_keymapdata(self, docnames, our_keymap, their_keymap):
+ for key, docname in their_keymap.items():
+ if docname in docnames:
+ if key in our_keymap:
+ our_docname = our_keymap[key]
+ self.merge_warn_duplicate(key, our_docname, docname)
+ else:
+ our_keymap[key] = docname
+
+ def merge_obarraydata(self, docnames, our_obarray, their_obarray):
+ for objname, their_cells in their_obarray.items():
+ our_cells = our_obarray.setdefault(objname, dict())
+ for cellname, their_cell in their_cells.items():
+ if their_cell.docname in docnames:
+ our_cell = our_cells.get(cellname)
+ if our_cell:
+ self.merge_warn_duplicate(objname, our_cell.docname,
+ their_cell.docname)
+ else:
+ our_cells[cellname] = their_cell
+
+ def merge_domaindata(self, docnames, otherdata):
+ self.merge_keymapdata(docnames, self.data['keymap'],
+ otherdata['keymap'])
+ self.merge_obarraydata(docnames, self.data['obarray'],
+ otherdata['obarray'])
+
+ def get_objects(self):
+ """Get all documented symbols for use in the search index."""
+ for name, symbol in self.data['obarray'].items():
+ for cellname, cell in symbol.items():
+ yield (name, name, cell.objtype, cell.docname,
+ make_target(cellname, name),
+ self.object_types[cell.objtype].attrs['searchprio'])
+
+
+def setup(app):
+ app.add_domain(EmacsLispDomain)
+ return {'version': '0.1', 'parallel_read_safe': True}
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