晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# :Id: $Id: __init__.py 9026 2022-03-04 15:57:13Z milde $
# :Author: Guenter Milde.
# :License: Released under the terms of the `2-Clause BSD license`_, in short:
#
#    Copying and distribution of this file, with or without modification,
#    are permitted in any medium without royalty provided the copyright
#    notice and this notice are preserved.
#    This file is offered as-is, without any warranty.
#
# .. _2-Clause BSD license: https://opensource.org/licenses/BSD-2-Clause

"""
This is the Docutils (Python Documentation Utilities) "math" sub-package.

It contains various modules for conversion between different math formats
(LaTeX, MathML, HTML).

:math2html:    LaTeX math -> HTML conversion from eLyXer
:latex2mathml: LaTeX math -> presentational MathML
:unichar2tex:  Unicode character to LaTeX math translation table
:tex2unichar:  LaTeX math to Unicode character translation dictionaries
:tex2mathml_extern: Wrapper for 3rd party TeX -> MathML converters
"""

# helpers for Docutils math support
# =================================


def toplevel_code(code):
    """Return string (LaTeX math) `code` with environments stripped out."""
    chunks = code.split(r'\begin{')
    return r'\begin{'.join(chunk.split(r'\end{')[-1]
                           for chunk in chunks)


def pick_math_environment(code, numbered=False):
    """Return the right math environment to display `code`.

    The test simply looks for line-breaks (``\\``) outside environments.
    Multi-line formulae are set with ``align``, one-liners with
    ``equation``.

    If `numbered` evaluates to ``False``, the "starred" versions are used
    to suppress numbering.
    """
    if toplevel_code(code).find(r'\\') >= 0:
        env = 'align'
    else:
        env = 'equation'
    if not numbered:
        env += '*'
    return env

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