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# Source code for sphinx.builders

    # -*- coding: utf-8 -*-
    """
        sphinx.builders
        ~~~~~~~~~~~~~~~

        Builder superclass for all builders.

        :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
        :license: BSD, see LICENSE for details.
    """

    import os
    from os import path

    try:
        import multiprocessing
    except ImportError:
        multiprocessing = None

    from docutils import nodes

    from sphinx.util import i18n, path_stabilize
    from sphinx.util.osutil import SEP, relative_uri
    from sphinx.util.i18n import find_catalog
    from sphinx.util.console import bold, darkgreen
    from sphinx.util.parallel import ParallelTasks, SerialTasks, make_chunks, \
        parallel_available

    # side effect: registers roles and directives
    from sphinx import roles       # noqa
    from sphinx import directives  # noqa

    class Builder(object):
        """
        Builds target formats from the reST sources.
        """

        # builder's name, for the -b command line options
        name = ''
        # builder's output format, or '' if no document output is produced
        format = ''
        # doctree versioning method
        versioning_method = 'none'
        versioning_compare = False
        # allow parallel write_doc() calls
        allow_parallel = False

        def __init__(self, app):
            self.env = app.env
            self.env.set_versioning_method(self.versioning_method,
                                           self.versioning_compare)
            self.srcdir = app.srcdir
            self.confdir = app.confdir
            self.outdir = app.outdir
            self.doctreedir = app.doctreedir
            if not path.isdir(self.doctreedir):
                os.makedirs(self.doctreedir)

            self.app = app
            self.warn = app.warn
            self.info = app.info
            self.config = app.config
            self.tags = app.tags
            self.tags.add(self.format)
            self.tags.add(self.name)
            self.tags.add("format_%s" % self.format)
            self.tags.add("builder_%s" % self.name)
            # compatibility aliases
            self.status_iterator = app.status_iterator
            self.old_status_iterator = app.old_status_iterator

            # images that need to be copied over (source -> dest)
            self.images = {}
            # basename of images directory
            self.imagedir = ""
            # relative path to image directory from current docname (used at writing docs)
            self.imgpath = ""

            # these get set later
            self.parallel_ok = False
            self.finish_tasks = None

            # load default translator class
            self.translator_class = app._translators.get(self.name)

            self.init()

        # helper methods
        def init(self):
            """Load necessary templates and perform initialization.  The default
            implementation does nothing.
            """
            pass

        def create_template_bridge(self):
            """Return the template bridge configured."""
            if self.config.template_bridge:
                self.templates = self.app.import_object(
                    self.config.template_bridge, 'template_bridge setting')()
            else:
                from sphinx.jinja2glue import BuiltinTemplateLoader
                self.templates = BuiltinTemplateLoader()

        def get_target_uri(self, docname, typ=None):
            """Return the target URI for a document name.

            *typ* can be used to qualify the link characteristic for individual
            builders.
            """
            raise NotImplementedError

        def get_relative_uri(self, from_, to, typ=None):
            """Return a relative URI between two source filenames.

            May raise environment.NoUri if there's no way to return a sensible URI.
            """
            return relative_uri(self.get_target_uri(from_),
                                self.get_target_uri(to, typ))

        def get_outdated_docs(self):
            """Return an iterable of output files that are outdated, or a string
            describing what an update build will build.

            If the builder does not output individual files corresponding to
            source files, return a string here.  If it does, return an iterable
            of those files that need to be written.
            """
            raise NotImplementedError

        supported_image_types = []

        def post_process_images(self, doctree):
            """Pick the best candidate for all image URIs."""
            for node in doctree.traverse(nodes.image):
                if '?' in node['candidates']:
                    # don't rewrite nonlocal image URIs
                    continue
                if '*' not in node['candidates']:
                    for imgtype in self.supported_image_types:
                        candidate = node['candidates'].get(imgtype, None)
                        if candidate:
                            break
                    else:
                        self.warn(
                            'no matching candidate for image URI %r' % node['uri'],
                            '%s:%s' % (node.source, getattr(node, 'line', '')))
                        continue
                    node['uri'] = candidate
                else:
                    candidate = node['uri']
                if candidate not in self.env.images:
                    # non-existing URI; let it alone
                    continue
                self.images[candidate] = self.env.images[candidate][1]

        # compile po methods

        def compile_catalogs(self, catalogs, message):
            if not self.config.gettext_auto_build:
                return

            def cat2relpath(cat):
                return path.relpath(cat.mo_path, self.env.srcdir).replace(path.sep, SEP)

            self.info(bold('building [mo]: ') + message)
            for catalog in self.app.status_iterator(
                    catalogs, 'writing output... ', darkgreen, len(catalogs),
                    cat2relpath):
                catalog.write_mo(self.config.language)

        def compile_all_catalogs(self):
            catalogs = i18n.find_catalog_source_files(
                [path.join(self.srcdir, x) for x in self.config.locale_dirs],
                self.config.language,
                charset=self.config.source_encoding,
                gettext_compact=self.config.gettext_compact,
                force_all=True)
            message = 'all of %d po files' % len(catalogs)
            self.compile_catalogs(catalogs, message)

        def compile_specific_catalogs(self, specified_files):
            def to_domain(fpath):
                docname, _ = path.splitext(path_stabilize(fpath))
                dom = find_catalog(docname, self.config.gettext_compact)
                return dom

            specified_domains = set(map(to_domain, specified_files))
            catalogs = i18n.find_catalog_source_files(
                [path.join(self.srcdir, x) for x in self.config.locale_dirs],
                self.config.language,
                domains=list(specified_domains),
                charset=self.config.source_encoding,
                gettext_compact=self.config.gettext_compact)
            message = 'targets for %d po files that are specified' % len(catalogs)
            self.compile_catalogs(catalogs, message)

        def compile_update_catalogs(self):
            catalogs = i18n.find_catalog_source_files(
                [path.join(self.srcdir, x) for x in self.config.locale_dirs],
                self.config.language,
                charset=self.config.source_encoding,
                gettext_compact=self.config.gettext_compact)
            message = 'targets for %d po files that are out of date' % len(catalogs)
            self.compile_catalogs(catalogs, message)

        # build methods

        def build_all(self):
            """Build all source files."""
            self.build(None, summary='all source files', method='all')

        def build_specific(self, filenames):
            """Only rebuild as much as needed for changes in the *filenames*."""
            # bring the filenames to the canonical format, that is,
            # relative to the source directory and without source_suffix.
            dirlen = len(self.srcdir) + 1
            to_write = []
            suffixes = tuple(self.config.source_suffix)
            for filename in filenames:
                filename = path.normpath(path.abspath(filename))
                if not filename.startswith(self.srcdir):
                    self.warn('file %r given on command line is not under the '
                              'source directory, ignoring' % filename)
                    continue
                if not (path.isfile(filename) or
                        any(path.isfile(filename + suffix) for suffix in suffixes)):
                    self.warn('file %r given on command line does not exist, '
                              'ignoring' % filename)
                    continue
                filename = filename[dirlen:]
                for suffix in suffixes:
                    if filename.endswith(suffix):
                        filename = filename[:-len(suffix)]
                        break
                filename = filename.replace(path.sep, SEP)
                to_write.append(filename)
            self.build(to_write, method='specific',
                       summary='%d source files given on command '
                       'line' % len(to_write))

        def build_update(self):
            """Only rebuild what was changed or added since last build."""
            to_build = self.get_outdated_docs()
            if isinstance(to_build, str):
                self.build(['__all__'], to_build)
            else:
                to_build = list(to_build)
                self.build(to_build,
                           summary='targets for %d source files that are '
                           'out of date' % len(to_build))

        def build(self, docnames, summary=None, method='update'):
            """Main build method.

            First updates the environment, and then calls :meth:`write`.
            """
            if summary:
                self.info(bold('building [%s]' % self.name) + ': ' + summary)

            # while reading, collect all warnings from docutils
            warnings = []
            self.env.set_warnfunc(lambda *args, **kwargs: warnings.append((args, kwargs)))
            updated_docnames = set(self.env.update(self.config, self.srcdir,
                                                   self.doctreedir, self.app))
            self.env.set_warnfunc(self.warn)
            for warning, kwargs in warnings:
                self.warn(*warning, **kwargs)

            doccount = len(updated_docnames)
            self.info(bold('looking for now-outdated files... '), nonl=1)
            for docname in self.env.check_dependents(updated_docnames):
                updated_docnames.add(docname)
            outdated = len(updated_docnames) - doccount
            if outdated:
                self.info('%d found' % outdated)
            else:
                self.info('none found')

            if updated_docnames:
                # save the environment
                from sphinx.application import ENV_PICKLE_FILENAME
                self.info(bold('pickling environment... '), nonl=True)
                self.env.topickle(path.join(self.doctreedir, ENV_PICKLE_FILENAME))
                self.info('done')

                # global actions
                self.info(bold('checking consistency... '), nonl=True)
                self.env.check_consistency()
                self.info('done')
            else:
                if method == 'update' and not docnames:
                    self.info(bold('no targets are out of date.'))
                    return

            # filter "docnames" (list of outdated files) by the updated
            # found_docs of the environment; this will remove docs that
            # have since been removed
            if docnames and docnames != ['__all__']:
                docnames = set(docnames) & self.env.found_docs

            # determine if we can write in parallel
            self.parallel_ok = False
            if parallel_available and self.app.parallel > 1 and self.allow_parallel:
                self.parallel_ok = True
                for extname, md in self.app._extension_metadata.items():
                    par_ok = md.get('parallel_write_safe', True)
                    if not par_ok:
                        self.app.warn('the %s extension is not safe for parallel '
                                      'writing, doing serial write' % extname)
                        self.parallel_ok = False
                        break

            #  create a task executor to use for misc. "finish-up" tasks
            # if self.parallel_ok:
            #     self.finish_tasks = ParallelTasks(self.app.parallel)
            # else:
            # for now, just execute them serially
            self.finish_tasks = SerialTasks()

            # write all "normal" documents (or everything for some builders)
            self.write(docnames, list(updated_docnames), method)

            # finish (write static files etc.)
            self.finish()

            # wait for all tasks
            self.finish_tasks.join()

        def write(self, build_docnames, updated_docnames, method='update'):
            if build_docnames is None or build_docnames == ['__all__']:
                # build_all
                build_docnames = self.env.found_docs
            if method == 'update':
                # build updated ones as well
                docnames = set(build_docnames) | set(updated_docnames)
            else:
                docnames = set(build_docnames)
            self.app.debug('docnames to write: %s', ', '.join(sorted(docnames)))

            # add all toctree-containing files that may have changed
            for docname in list(docnames):
                for tocdocname in self.env.files_to_rebuild.get(docname, []):
                    if tocdocname in self.env.found_docs:
                        docnames.add(tocdocname)
            docnames.add(self.config.master_doc)

            self.info(bold('preparing documents... '), nonl=True)
            self.prepare_writing(docnames)
            self.info('done')

            warnings = []
            self.env.set_warnfunc(lambda *args, **kwargs: warnings.append((args, kwargs)))
            if self.parallel_ok:
                # number of subprocesses is parallel-1 because the main process
                # is busy loading doctrees and doing write_doc_serialized()
                self._write_parallel(sorted(docnames), warnings,
                                     nproc=self.app.parallel - 1)
            else:
                self._write_serial(sorted(docnames), warnings)
            self.env.set_warnfunc(self.warn)

        def _write_serial(self, docnames, warnings):
            for docname in self.app.status_iterator(
                    docnames, 'writing output... ', darkgreen, len(docnames)):
                doctree = self.env.get_and_resolve_doctree(docname, self)
                self.write_doc_serialized(docname, doctree)
                self.write_doc(docname, doctree)
            for warning, kwargs in warnings:
                self.warn(*warning, **kwargs)

        def _write_parallel(self, docnames, warnings, nproc):
            def write_process(docs):
                local_warnings = []

                def warnfunc(*args, **kwargs):
                    local_warnings.append((args, kwargs))
                self.env.set_warnfunc(warnfunc)
                for docname, doctree in docs:
                    self.write_doc(docname, doctree)
                return local_warnings

            def add_warnings(docs, wlist):
                warnings.extend(wlist)

            # warm up caches/compile templates using the first document
            firstname, docnames = docnames[0], docnames[1:]
            doctree = self.env.get_and_resolve_doctree(firstname, self)
            self.write_doc_serialized(firstname, doctree)
            self.write_doc(firstname, doctree)

            tasks = ParallelTasks(nproc)
            chunks = make_chunks(docnames, nproc)

            for chunk in self.app.status_iterator(
                    chunks, 'writing output... ', darkgreen, len(chunks)):
                arg = []
                for i, docname in enumerate(chunk):
                    doctree = self.env.get_and_resolve_doctree(docname, self)
                    self.write_doc_serialized(docname, doctree)
                    arg.append((docname, doctree))
                tasks.add_task(write_process, arg, add_warnings)

            # make sure all threads have finished
            self.info(bold('waiting for workers...'))
            tasks.join()

            for warning, kwargs in warnings:
                self.warn(*warning, **kwargs)

        def prepare_writing(self, docnames):
            """A place where you can add logic before :meth:`write_doc` is run"""
            raise NotImplementedError

        def write_doc(self, docname, doctree):
            """Where you actually write something to the filesystem."""
            raise NotImplementedError

        def write_doc_serialized(self, docname, doctree):
            """Handle parts of write_doc that must be called in the main process
            if parallel build is active.
            """
            pass

        def finish(self):
            """Finish the building process.

            The default implementation does nothing.
            """
            pass

        def cleanup(self):
            """Cleanup any resources.

            The default implementation does nothing.
            """
            pass

        def get_builder_config(self, option, default):
            """Return a builder specific option.

            This method allows customization of common builder settings by
            inserting the name of the current builder in the option key.
            If the key does not exist, use default as builder name.
            """
            # At the moment, only XXX_use_index is looked up this way.
            # Every new builder variant must be registered in Config.config_values.
            try:
                optname = '%s_%s' % (self.name, option)
                return getattr(self.config, optname)
            except AttributeError:
                optname = '%s_%s' % (default, option)
                return getattr(self.config, optname)

    BUILTIN_BUILDERS = {
        'dummy':      ('dummy', 'DummyBuilder'),
        'html':       ('html', 'StandaloneHTMLBuilder'),
        'dirhtml':    ('html', 'DirectoryHTMLBuilder'),
        'singlehtml': ('html', 'SingleFileHTMLBuilder'),
        'pickle':     ('html', 'PickleHTMLBuilder'),
        'json':       ('html', 'JSONHTMLBuilder'),
        'web':        ('html', 'PickleHTMLBuilder'),
        'htmlhelp':   ('htmlhelp', 'HTMLHelpBuilder'),
        'devhelp':    ('devhelp', 'DevhelpBuilder'),
        'qthelp':     ('qthelp', 'QtHelpBuilder'),
        'applehelp':  ('applehelp', 'AppleHelpBuilder'),
        'epub':       ('epub', 'EpubBuilder'),
        'epub3':      ('epub3', 'Epub3Builder'),
        'latex':      ('latex', 'LaTeXBuilder'),
        'text':       ('text', 'TextBuilder'),
        'man':        ('manpage', 'ManualPageBuilder'),
        'texinfo':    ('texinfo', 'TexinfoBuilder'),
        'changes':    ('changes', 'ChangesBuilder'),
        'linkcheck':  ('linkcheck', 'CheckExternalLinksBuilder'),
        'websupport': ('websupport', 'WebSupportBuilder'),
        'gettext':    ('gettext', 'MessageCatalogBuilder'),
        'xml':        ('xml', 'XMLBuilder'),
        'pseudoxml':  ('xml', 'PseudoXMLBuilder'),
    }