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Adding script to generate latex_symbols.py.
Brian E. Granger -
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@@ -0,0 +1,76 b''
1 # coding: utf-8
2
3 # This script autogenerates `IPython.core.latex_symbols.py`, which contains a
4 # single dict , named `latex_symbols`. The keys in this dict are latex symbols,
5 # such as `\\alpha` and the values in the dict are the unicode equivalents for
6 # those. Most importantly, only unicode symbols that are valid identifers in
7 # Python 3 are included.
8
9 #
10 # The original mapping of latex symbols to unicode comes from the `latex_symbols.jl` files from Julia.
11
12 from __future__ import print_function
13
14 # Import the Julia LaTeX symbols
15 print('Importing latex_symbols.js from Julia...')
16 import requests
17 url = 'https://raw.githubusercontent.com/JuliaLang/julia/master/base/latex_symbols.jl'
18 r = requests.get(url)
19
20
21 # Build a list of key, value pairs
22 print('Building a list of (latex, unicode) key-vaule pairs...')
23 lines = r.text.splitlines()[60:]
24 lines = [line for line in lines if '=>' in line]
25 lines = [line.replace('=>',':') for line in lines]
26
27 def line_to_tuple(line):
28 """Convert a single line of the .jl file to a 2-tuple of strings like ("\\alpha", "α")"""
29 kv = line.split(',')[0].split(':')
30 # kv = tuple(line.strip(', ').split(':'))
31 k, v = kv[0].strip(' "'), kv[1].strip(' "')
32 # if not test_ident(v):
33 # print(line)
34 return k, v
35
36 assert line_to_tuple(' "\\sqrt" : "\u221A",') == ('\\sqrt', '\u221A')
37 lines = [line_to_tuple(line) for line in lines]
38
39
40 # Filter out non-valid identifiers
41 print('Filtering out characters that are not valid Python 3 identifiers')
42
43 def test_ident(i):
44 """Is the unicode string a valid Python 3 identifer."""
45 try:
46 exec('a%s = 10' % i, {}, {})
47 except SyntaxError:
48 return False
49 else:
50 return True
51
52 assert test_ident("α")
53 assert not test_ident('‴')
54
55 valid_idents = [line for line in lines if test_ident(line[1])]
56
57
58 # Write the `latex_symbols.py` module in the cwd
59
60 s = """# encoding: utf-8
61
62 # This file is autogenerated from the file:
63 # https://raw.githubusercontent.com/JuliaLang/julia/master/base/latex_symbols.jl
64 # This original list is filtered to remove any unicode characters that are not valid
65 # Python identifiers.
66
67 latex_symbols = {\n
68 """
69 for line in valid_idents:
70 s += ' "%s" : "%s",\n' % (line[0], line[1])
71 s += "}\n"
72
73 with open('latex_symbols.py', 'w', encoding='utf-8') as f:
74 f.write(s)
75
76
1 NO CONTENT: file was removed
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