"""
    pygments.sphinxext
    ~~~~~~~~~~~~~~~~~~

    Sphinx extension to generate automatic documentation of lexers,
    formatters and filters.

    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import sys

from docutils import nodes
from docutils.statemachine import ViewList
from docutils.parsers.rst import Directive
from sphinx.util.nodes import nested_parse_with_titles


MODULEDOC = '''
.. module:: %s

%s
%s
'''

LEXERDOC = '''
.. class:: %s

    :Short names: %s
    :Filenames:   %s
    :MIME types:  %s

    %s

'''

FMTERDOC = '''
.. class:: %s

    :Short names: %s
    :Filenames: %s

    %s

'''

FILTERDOC = '''
.. class:: %s

    :Name: %s

    %s

'''


class PygmentsDoc(Directive):
    """
    A directive to collect all lexers/formatters/filters and generate
    autoclass directives for them.
    """
    has_content = False
    required_arguments = 1
    optional_arguments = 0
    final_argument_whitespace = False
    option_spec = {}

    def run(self):
        self.filenames = set()
        if self.arguments[0] == 'lexers':
            out = self.document_lexers()
        elif self.arguments[0] == 'formatters':
            out = self.document_formatters()
        elif self.arguments[0] == 'filters':
            out = self.document_filters()
        else:
            raise Exception('invalid argument for "pygmentsdoc" directive')
        node = nodes.compound()
        vl = ViewList(out.split('\n'), source='')
        nested_parse_with_titles(self.state, vl, node)
        for fn in self.filenames:
            self.state.document.settings.record_dependencies.add(fn)
        return node.children

    def document_lexers(self):
        from pygments.lexers._mapping import LEXERS
        out = []
        modules = {}
        moduledocstrings = {}
        for classname, data in sorted(LEXERS.items(), key=lambda x: x[0]):
            module = data[0]
            mod = __import__(module, None, None, [classname])
            self.filenames.add(mod.__file__)
            cls = getattr(mod, classname)
            if not cls.__doc__:
                print("Warning: %s does not have a docstring." % classname)
            docstring = cls.__doc__
            if isinstance(docstring, bytes):
                docstring = docstring.decode('utf8')
            modules.setdefault(module, []).append((
                classname,
                ', '.join(data[2]) or 'None',
                ', '.join(data[3]).replace('*', '\\*').replace('_', '\\') or 'None',
                ', '.join(data[4]) or 'None',
                docstring))
            if module not in moduledocstrings:
                moddoc = mod.__doc__
                if isinstance(moddoc, bytes):
                    moddoc = moddoc.decode('utf8')
                moduledocstrings[module] = moddoc

        for module, lexers in sorted(modules.items(), key=lambda x: x[0]):
            if moduledocstrings[module] is None:
                raise Exception("Missing docstring for %s" % (module,))
            heading = moduledocstrings[module].splitlines()[4].strip().rstrip('.')
            out.append(MODULEDOC % (module, heading, '-'*len(heading)))
            for data in lexers:
                out.append(LEXERDOC % data)

        return ''.join(out)

    def document_formatters(self):
        from pygments.formatters import FORMATTERS

        out = []
        for classname, data in sorted(FORMATTERS.items(), key=lambda x: x[0]):
            module = data[0]
            mod = __import__(module, None, None, [classname])
            self.filenames.add(mod.__file__)
            cls = getattr(mod, classname)
            docstring = cls.__doc__
            if isinstance(docstring, bytes):
                docstring = docstring.decode('utf8')
            heading = cls.__name__
            out.append(FMTERDOC % (heading, ', '.join(data[2]) or 'None',
                                   ', '.join(data[3]).replace('*', '\\*') or 'None',
                                   docstring))
        return ''.join(out)

    def document_filters(self):
        from pygments.filters import FILTERS

        out = []
        for name, cls in FILTERS.items():
            self.filenames.add(sys.modules[cls.__module__].__file__)
            docstring = cls.__doc__
            if isinstance(docstring, bytes):
                docstring = docstring.decode('utf8')
            out.append(FILTERDOC % (cls.__name__, name, docstring))
        return ''.join(out)


def setup(app):
    app.add_directive('pygmentsdoc', PygmentsDoc)
