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