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DOC: Dynamically resize mathtext symbol tables (#26143)#30661

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235 changes: 94 additions & 141 deletionsdoc/sphinxext/math_symbol_table.py
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Original file line numberDiff line numberDiff line change
@@ -1,152 +1,105 @@
import re
from docutils.parsers.rst import Directive
"""
Sphinx extension that generates the math symbol table documentation
for Matplotlib.
"""

from matplotlib import _mathtext, _mathtext_data
from __future__ import annotations
from textwrap import dedent
from docutils.statemachine import StringList
from docutils import nodes
from sphinx.util.docutils import SphinxDirective
from matplotlib import _mathtext

bb_pattern = re.compile("Bbb[A-Z]")
scr_pattern = re.compile("scr[a-zA-Z]")
frak_pattern = re.compile("frak[A-Z]")

symbols = [
["Lower-case Greek",
4,
(r"\alpha", r"\beta", r"\gamma", r"\chi", r"\delta", r"\epsilon",
r"\eta", r"\iota", r"\kappa", r"\lambda", r"\mu", r"\nu", r"\omega",
r"\phi", r"\pi", r"\psi", r"\rho", r"\sigma", r"\tau", r"\theta",
r"\upsilon", r"\xi", r"\zeta", r"\digamma", r"\varepsilon", r"\varkappa",
r"\varphi", r"\varpi", r"\varrho", r"\varsigma", r"\vartheta")],
["Upper-case Greek",
4,
(r"\Delta", r"\Gamma", r"\Lambda", r"\Omega", r"\Phi", r"\Pi", r"\Psi",
r"\Sigma", r"\Theta", r"\Upsilon", r"\Xi")],
["Hebrew",
6,
(r"\aleph", r"\beth", r"\gimel", r"\daleth")],
["Latin named characters",
6,
r"""\aa \AA \ae \AE \oe \OE \O \o \thorn \Thorn \ss \eth \dh \DH""".split()],
["Delimiters",
5,
_mathtext.Parser._delims],
["Big symbols",
5,
_mathtext.Parser._overunder_symbols | _mathtext.Parser._dropsub_symbols],
["Standard function names",
5,
{fr"\{fn}" for fn in _mathtext.Parser._function_names}],
["Binary operation symbols",
4,
_mathtext.Parser._binary_operators],
["Relation symbols",
4,
_mathtext.Parser._relation_symbols],
["Arrow symbols",
4,
_mathtext.Parser._arrow_symbols],
["Dot symbols",
4,
r"""\cdots \vdots \ldots \ddots \adots \Colon \therefore \because""".split()],
["Black-board characters",
6,
[fr"\{symbol}" for symbol in _mathtext_data.tex2uni
if re.match(bb_pattern, symbol)]],
["Script characters",
6,
[fr"\{symbol}" for symbol in _mathtext_data.tex2uni
if re.match(scr_pattern, symbol)]],
["Fraktur characters",
6,
[fr"\{symbol}" for symbol in _mathtext_data.tex2uni
if re.match(frak_pattern, symbol)]],
["Miscellaneous symbols",
4,
r"""\neg \infty \forall \wp \exists \bigstar \angle \partial
\nexists \measuredangle \emptyset \sphericalangle \clubsuit
\varnothing \complement \diamondsuit \imath \Finv \triangledown
\heartsuit \jmath \Game \spadesuit \ell \hbar \vartriangle
\hslash \blacksquare \blacktriangle \sharp \increment
\prime \blacktriangledown \Im \flat \backprime \Re \natural
\circledS \P \copyright \circledR \S \yen \checkmark \$
\cent \triangle \QED \sinewave \dag \ddag \perthousand \ac
\lambdabar \L \l \degree \danger \maltese \clubsuitopen
\i \hermitmatrix \sterling \nabla \mho""".split()],
]
class MathSymbolTableDirective(SphinxDirective):
"""Generate tables of math symbols grouped by category."""


def run(state_machine):

def render_symbol(sym, ignore_variant=False):
if ignore_variant and sym not in (r"\varnothing", r"\varlrtriangle"):
sym = sym.replace(r"\var", "\\")
if sym.startswith("\\"):
sym = sym.lstrip("\\")
if sym not in (_mathtext.Parser._overunder_functions |
_mathtext.Parser._function_names):
sym = chr(_mathtext_data.tex2uni[sym])
return f'\\{sym}' if sym in ('\\', '|', '+', '-', '*') else sym

lines = []
for category, columns, syms in symbols:
syms = sorted(syms,
# Sort by Unicode and place variants immediately
# after standard versions.
key=lambda sym: (render_symbol(sym, ignore_variant=True),
sym.startswith(r"\var")),
reverse=(category == "Hebrew")) # Hebrew is rtl
rendered_syms = [f"{render_symbol(sym)} ``{sym}``" for sym in syms]
columns = min(columns, len(syms))
lines.append("**%s**" % category)
lines.append('')
max_width = max(map(len, rendered_syms))
header = (('=' * max_width) + ' ') * columns
lines.append(header.rstrip())
for part in range(0, len(rendered_syms), columns):
row = " ".join(
sym.rjust(max_width) for sym in rendered_syms[part:part + columns])
lines.append(row)
lines.append(header.rstrip())
lines.append('')

state_machine.insert_input(lines, "Symbol table")
return []


class MathSymbolTableDirective(Directive):
has_content = False
required_arguments = 0
optional_arguments = 0
final_argument_whitespace = False
option_spec = {}

def run(self):
return run(self.state_machine)
# Build RST lines to be parsed. We include a small CSS style and
# simple HTML wrappers so the result is responsive in the browser.
lines: list[str] = []

style = dedent(
"\n".join(
[
"<style>",
".mpl-symbol-table { margin: 0 0 1rem 0; }",
".mpl-symbol-grid {",
" display: grid;",
" grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));",
" gap: 0.5rem 1rem;",
" align-items: center;",
"}",
".mpl-symbol-cell {",
" display: flex;",
" align-items: center;",
" gap: 0.6rem;",
" padding: 0.2rem 0.1rem;",
" white-space: nowrap;",
"}",
".mpl-symbol-cell .label {",
" font-family: monospace;",
" font-size: 0.9em;",
" color: #333;",
"}",
".mpl-symbol-cell .math {",
" font-size: 1.05em;",
"}",
"</style>",
]
)
)

# Insert the style as raw HTML block
lines.append(".. raw:: html")
lines.append("")
for style_line in style.splitlines():
lines.append(" " + style_line)
lines.append("")

# Get symbol categories from matplotlib mathtext internals.
try:
categories = _mathtext._get_sphinx_symbol_table()
except Exception:
categories = []

for category, _, syms in categories:
# Ensure consistent ordering for reproducible output.
syms_list = sorted(list(syms), key=lambda s: str(s))

lines.append(f"**{category}**")
lines.append("")
lines.append(".. raw:: html")
lines.append("")
lines.append(' <div class="mpl-symbol-table">')
lines.append(' <div class="mpl-symbol-grid">')

for sym in syms_list:
s = str(sym)
# Use raw TeX inside \( ... \) so MathJax (Sphinx) renders it.
tex = s
html_line = (
" <div class=\"mpl-symbol-cell\">"
f"<span class=\"math\">\\({tex}\\)</span>"
f"<span class=\"label\">`{s}`</span>"
"</div>"
)
lines.append(html_line)

lines.append(" </div>")
lines.append(" </div>")
lines.append("")

# Let Sphinx parse the lines so roles and references work.
text = "\n".join(lines)
node = nodes.paragraph()
self.state.nested_parse(StringList(text.splitlines()), 0, node)
return [node]


def setup(app):
"""Register the Sphinx directive."""
app.add_directive("math_symbol_table", MathSymbolTableDirective)

metadata = {'parallel_read_safe': True, 'parallel_write_safe': True}
return metadata


if __name__ == "__main__":
# Do some verification of the tables

print("SYMBOLS NOT IN STIX:")
all_symbols = {}
for category, columns, syms in symbols:
if category == "Standard Function Names":
continue
for sym in syms:
if len(sym) > 1:
all_symbols[sym[1:]] = None
if sym[1:] not in _mathtext_data.tex2uni:
print(sym)

# Add accents
all_symbols.update({v[1:]: k for k, v in _mathtext.Parser._accent_map.items()})
all_symbols.update({v: v for v in _mathtext.Parser._wide_accents})
print("SYMBOLS NOT IN TABLE:")
for sym, val in _mathtext_data.tex2uni.items():
if sym not in all_symbols:
print(f"{sym} = {chr(val)}")
return {"parallel_read_safe": True, "parallel_write_safe": True}
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