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+# :Id: $Id: __init__.py 9516 2024-01-15 16:11:08Z 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
+:mathalphabet2unichar:  LaTeX math alphabets to Unicode character translation
+:tex2mathml_extern: Wrapper for 3rd party TeX -> MathML converters
+"""
+
+# helpers for Docutils math support
+# =================================
+
+
+class MathError(ValueError):
+    """Exception for math syntax and math conversion errors.
+
+    The additional attribute `details` may hold a list of Docutils
+    nodes suitable as children for a ``<system_message>``.
+    """
+    def __init__(self, msg, details=[]):
+        super().__init__(msg)
+        self.details = details
+
+
+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
+
+
+def wrap_math_code(code, as_block):
+    # Wrap math-code in mode-switching TeX command/environment.
+    # If `as_block` is True, use environment for displayed equation(s).
+    if as_block:
+        env = pick_math_environment(code)
+        return '\\begin{%s}\n%s\n\\end{%s}' % (env, code, env)
+    return '$%s$' % code