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# coding: utf-8
# This script autogenerates `IPython.core.latex_symbols.py`, which contains a
# single dict , named `latex_symbols`. The keys in this dict are latex symbols,
# such as `\\alpha` and the values in the dict are the unicode equivalents for
# those. Most importantly, only unicode symbols that are valid identifiers in
# Python 3 are included.
#
# The original mapping of latex symbols to unicode comes from the `latex_symbols.jl` files from Julia.
import os, sys
# Import the Julia LaTeX symbols
print('Importing latex_symbols.js from Julia...')
import requests
url = 'https://raw.githubusercontent.com/JuliaLang/julia/master/stdlib/REPL/src/latex_symbols.jl'
r = requests.get(url)
# Build a list of key, value pairs
print('Building a list of (latex, unicode) key-value pairs...')
lines = r.text.splitlines()
prefixes_line = lines.index('# "font" prefixes')
symbols_line = lines.index('# manual additions:')
prefix_dict = {}
for l in lines[prefixes_line + 1: symbols_line]:
p = l.split()
if not p or p[1] == 'latex_symbols': continue
prefix_dict[p[1]] = p[3]
idents = []
for l in lines[symbols_line:]:
if not '=>' in l: continue # if it's not a def, skip
if '#' in l: l = l[:l.index('#')] # get rid of eol comments
x, y = l.strip().split('=>')
if '*' in x: # if a prefix is present substitute it with its value
p, x = x.split('*')
x = prefix_dict[p][:-1] + x[1:]
x, y = x.split('"')[1], y.split('"')[1] # get the values in quotes
idents.append((x, y))
# Filter out non-valid identifiers
print('Filtering out characters that are not valid Python 3 identifiers')
def test_ident(i):
"""Is the unicode string valid in a Python 3 identifier."""
# Some characters are not valid at the start of a name, but we still want to
# include them. So prefix with 'a', which is valid at the start.
return ('a' + i).isidentifier()
assert test_ident("α")
assert not test_ident('‴')
valid_idents = [line for line in idents if test_ident(line[1])]
# Write the `latex_symbols.py` module in the cwd
s = """# encoding: utf-8
# DO NOT EDIT THIS FILE BY HAND.
# To update this file, run the script /tools/gen_latex_symbols.py using Python 3
# This file is autogenerated from the file:
# https://raw.githubusercontent.com/JuliaLang/julia/master/base/latex_symbols.jl
# This original list is filtered to remove any unicode characters that are not valid
# Python identifiers.
latex_symbols = {\n
"""
for line in valid_idents:
s += ' "%s" : "%s",\n' % (line[0], line[1])
s += "}\n"
s += """
reverse_latex_symbol = { v:k for k,v in latex_symbols.items()}
"""
fn = os.path.join('..','IPython','core','latex_symbols.py')
print("Writing the file: %s" % fn)
with open(fn, 'w', encoding='utf-8') as f:
f.write(s)
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