# -*- coding: utf-8 -*-
"""
    pygments.formatters
    ~~~~~~~~~~~~~~~~~~~

    Pygments formatters.

    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re
import sys
import types
import fnmatch
from os.path import basename

from pygments.formatters._mapping import FORMATTERS
from pygments.plugin import find_plugin_formatters
from pygments.util import ClassNotFound, itervalues

__all__ = ['get_formatter_by_name', 'get_formatter_for_filename',
           'get_all_formatters'] + list(FORMATTERS)

_formatter_cache = {}  # classes by name
_pattern_cache = {}


def _fn_matches(fn, glob):
    """Return whether the supplied file name fn matches pattern filename."""
    if glob not in _pattern_cache:
        pattern = _pattern_cache[glob] = re.compile(fnmatch.translate(glob))
        return pattern.match(fn)
    return _pattern_cache[glob].match(fn)


def _load_formatters(module_name):
    """Load a formatter (and all others in the module too)."""
    mod = __import__(module_name, None, None, ['__all__'])
    for formatter_name in mod.__all__:
        cls = getattr(mod, formatter_name)
        _formatter_cache[cls.name] = cls


def get_all_formatters():
    """Return a generator for all formatter classes."""
    # NB: this returns formatter classes, not info like get_all_lexers().
    for info in itervalues(FORMATTERS):
        if info[1] not in _formatter_cache:
            _load_formatters(info[0])
        yield _formatter_cache[info[1]]
    for _, formatter in find_plugin_formatters():
        yield formatter


def find_formatter_class(alias):
    """Lookup a formatter by alias.

    Returns None if not found.
    """
    for module_name, name, aliases, _, _ in itervalues(FORMATTERS):
        if alias in aliases:
            if name not in _formatter_cache:
                _load_formatters(module_name)
            return _formatter_cache[name]
    for _, cls in find_plugin_formatters():
        if alias in cls.aliases:
            return cls


def get_formatter_by_name(_alias, **options):
    """Lookup and instantiate a formatter by alias.

    Raises ClassNotFound if not found.
    """
    cls = find_formatter_class(_alias)
    if cls is None:
        raise ClassNotFound("no formatter found for name %r" % _alias)
    return cls(**options)


def get_formatter_for_filename(fn, **options):
    """Lookup and instantiate a formatter by filename pattern.

    Raises ClassNotFound if not found.
    """
    fn = basename(fn)
    for modname, name, _, filenames, _ in itervalues(FORMATTERS):
        for filename in filenames:
            if _fn_matches(fn, filename):
                if name not in _formatter_cache:
                    _load_formatters(modname)
                return _formatter_cache[name](**options)
    for cls in find_plugin_formatters():
        for filename in cls.filenames:
            if _fn_matches(fn, filename):
                return cls(**options)
    raise ClassNotFound("no formatter found for file name %r" % fn)


class _automodule(types.ModuleType):
    """Automatically import formatters."""

    def __getattr__(self, name):
        info = FORMATTERS.get(name)
        if info:
            _load_formatters(info[0])
            cls = _formatter_cache[info[1]]
            setattr(self, name, cls)
            return cls
        raise AttributeError(name)


oldmod = sys.modules[__name__]
newmod = _automodule(__name__)
newmod.__dict__.update(oldmod.__dict__)
sys.modules[__name__] = newmod
del newmod.newmod, newmod.oldmod, newmod.sys, newmod.types
