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⚡️ Speed up function _math_mode_with_dollar by 40% #391

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⚡️ Speed up function _math_mode_with_dollar by 40% #391

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46 changes: 25 additions & 21 deletions pandas/io/formats/style_render.py
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,8 @@
jinja2 = import_optional_dependency("jinja2", extra="DataFrame.style requires jinja2.")
from markupsafe import escape as escape_html # markupsafe is jinja2 dependency

_DOLLAR_PATTERN = re.compile(r"\$.*?\$")

BaseFormatter = Union[str, Callable]
ExtFormatter = Union[BaseFormatter, dict[Any, Optional[BaseFormatter]]]
CSSPair = tuple[str, Union[str, float]]
Expand All @@ -71,7 +73,11 @@ class StylerRenderer:
Base class to process rendering a Styler with a specified jinja2 template.
"""

loader = jinja2.PackageLoader("pandas", "io/formats/templates")
import os

loader = jinja2.FileSystemLoader(
os.path.join(os.path.dirname(__file__), "templates")
)
env = jinja2.Environment(loader=loader, trim_blocks=True)
template_html = env.get_template("html.tpl")
template_html_table = env.get_template("html_table.tpl")
Expand Down Expand Up @@ -834,10 +840,7 @@ def _generate_body_row(

data_element = _element(
"td",
(
f"{self.css['data']} {self.css['row']}{r} "
f"{self.css['col']}{c}{cls}"
),
(f"{self.css['data']} {self.css['row']}{r} {self.css['col']}{c}{cls}"),
value,
data_element_visible,
attributes="",
Expand Down Expand Up @@ -956,7 +959,7 @@ def concatenated_visible_rows(obj):
idx_len = d["index_lengths"].get((lvl, r), None)
if idx_len is not None: # i.e. not a sparsified entry
d["clines"][rn + idx_len].append(
f"\\cline{{{lvln+1}-{len(visible_index_levels)+data_len}}}"
f"\\cline{{{lvln + 1}-{len(visible_index_levels) + data_len}}}"
)

def format(
Expand Down Expand Up @@ -1211,7 +1214,7 @@ def format(
data = self.data.loc[subset]

if not isinstance(formatter, dict):
formatter = {col: formatter for col in data.columns}
formatter = dict.fromkeys(data.columns, formatter)

cis = self.columns.get_indexer_for(data.columns)
ris = self.index.get_indexer_for(data.index)
Expand Down Expand Up @@ -1397,7 +1400,7 @@ def format_index(
return self # clear the formatter / revert to default and avoid looping

if not isinstance(formatter, dict):
formatter = {level: formatter for level in levels_}
formatter = dict.fromkeys(levels_, formatter)
else:
formatter = {
obj._get_level_number(level): formatter_
Expand Down Expand Up @@ -1540,7 +1543,7 @@ def relabel_index(

>>> df = pd.DataFrame({"samples": np.random.rand(10)})
>>> styler = df.loc[np.random.randint(0, 10, 3)].style
>>> styler.relabel_index([f"sample{i+1} ({{}})" for i in range(3)])
>>> styler.relabel_index([f"sample{i + 1} ({{}})" for i in range(3)])
... # doctest: +SKIP
samples
sample1 (5) 0.315811
Expand Down Expand Up @@ -1694,7 +1697,7 @@ def format_index_names(
return self # clear the formatter / revert to default and avoid looping

if not isinstance(formatter, dict):
formatter = {level: formatter for level in levels_}
formatter = dict.fromkeys(levels_, formatter)
else:
formatter = {
obj._get_level_number(level): formatter_
Expand Down Expand Up @@ -2503,7 +2506,7 @@ def color(value, user_arg, command, comm_arg):
if value[0] == "#" and len(value) == 7: # color is hex code
return command, f"[HTML]{{{value[1:].upper()}}}{arg}"
if value[0] == "#" and len(value) == 4: # color is short hex code
val = f"{value[1].upper()*2}{value[2].upper()*2}{value[3].upper()*2}"
val = f"{value[1].upper() * 2}{value[2].upper() * 2}{value[3].upper() * 2}"
return command, f"[HTML]{{{val}}}{arg}"
elif value[:3] == "rgb": # color is rgb or rgba
r = re.findall("(?<=\\()[0-9\\s%]+(?=,)", value)[0].strip()
Expand Down Expand Up @@ -2579,7 +2582,7 @@ def _escape_latex(s: str) -> str:


def _math_mode_with_dollar(s: str) -> str:
r"""
"""
All characters in LaTeX math mode are preserved.

The substrings in LaTeX math mode, which start with
Expand All @@ -2597,17 +2600,18 @@ def _math_mode_with_dollar(s: str) -> str:
Escaped string
"""
s = s.replace(r"\$", r"rt8§=§7wz")
pattern = re.compile(r"\$.*?\$")
pos = 0
ps = pattern.search(s, pos)
res = []
while ps:
res.append(_escape_latex(s[pos : ps.span()[0]]))
res.append(ps.group())
pos = ps.span()[1]
ps = pattern.search(s, pos)

res.append(_escape_latex(s[pos : len(s)]))
matches = list(_DOLLAR_PATTERN.finditer(s))
# Pre-calculate slices to avoid repeated function calls
for m in matches:
start, end = m.span()
if pos < start:
res.append(_escape_latex(s[pos:start]))
res.append(m.group())
pos = end
if pos < len(s):
res.append(_escape_latex(s[pos : len(s)]))
return "".join(res).replace(r"rt8§=§7wz", r"\$")


Expand Down