def _convert_command(
element: str,
elements: List[Any],
index: int,
iterable: Iterator[int],
parent: Element,
):
_get_prefix_element(element, parent)
if element == r"\substack":
parent = SubElement(parent, "mstyle", scriptlevel="1")
params, tag, attributes = COMMANDS[element]
if len(elements) - 1 < params:
mo = SubElement(parent, "mo")
mo.text = element[1:]
return
new_parent = SubElement(parent, tag, attributes)
alignment = ""
if element in MATRICES and (element.endswith("*") or element == r"\array"):
index += 1
alignment = elements[index]
next(iterable)
if element in (r"\lim", r"\inf", r"\sup", r"\max", r"\min"):
limit = SubElement(new_parent, "mo")
limit.text = element[1:]
for j in range(params):
index += 1
param = elements[index]
if element == "_" and index == 1 and param == r"\sum":
new_parent.tag = "munder"
_classify(param, new_parent)
elif element == r"\left" or element == r"\right":
if param == ".":
pass
else:
symbol = convert_symbol(param)
new_parent.text = param if symbol is None else "&#x{};".format(
symbol)
elif element == r"\array":
_convert_array_content(param, new_parent, alignment)
elif element in MATRICES:
_convert_matrix_content(param, new_parent, alignment,
element == r"\substack")
else:
if isinstance(param, list):
_parent = SubElement(new_parent, "mrow")
_classify_subgroup(param, _parent)
else:
_classify(param, new_parent)
_get_postfix_element(element, parent)
if element in (r"\overline", r"\bar"):
mo = SubElement(new_parent, "mo", stretchy="true")
mo.text = "¯"
elif element == r"\underline":
mo = SubElement(new_parent, "mo", stretchy="true")
mo.text = "̲"
elif element in (r"\overrightarrow", r"\vec"):
mo = SubElement(new_parent, "mo", stretchy="true")
mo.text = "→"
[next(iterable) for _ in range(params)]
