--- /dev/null
+#!/usr/bin/python
+#
+# This script builds unaccent.rules on standard output when given the
+# contents of UnicodeData.txt[1] on standard input. Optionally includes
+# ligature expansion, if --expand-ligatures is given on the command line.
+#
+# The approach is to use the Unicode decomposition data to identify
+# precomposed codepoints that are equivalent to a ligature of several
+# letters, or a base letter with any number of diacritical marks.
+# There is also a small set of special cases for codepoints that we
+# traditionally support even though Unicode doesn't consider them to
+# be ligatures or letters with marks.
+#
+# [1] http://unicode.org/Public/7.0.0/ucd/UnicodeData.txt
+
+import re
+import sys
+
+def print_record(codepoint, letter):
+ print (unichr(codepoint) + "\t" + letter).encode("UTF-8")
+
+class Codepoint:
+ def __init__(self, id, general_category, combining_ids):
+ self.id = id
+ self.general_category = general_category
+ self.combining_ids = combining_ids
+
+def is_plain_letter(codepoint):
+ """Return true if codepoint represents a plain ASCII letter."""
+ return (codepoint.id >= ord('a') and codepoint.id <= ord('z')) or \
+ (codepoint.id >= ord('A') and codepoint.id <= ord('Z'))
+
+def is_mark(codepoint):
+ """Returns true for diacritical marks (combining codepoints)."""
+ return codepoint.general_category in ("Mn", "Me", "Mc")
+
+def is_letter_with_marks(codepoint, table):
+ """Returns true for plain letters combined with one or more marks."""
+ # See http://www.unicode.org/reports/tr44/tr44-14.html#General_Category_Values
+ return len(codepoint.combining_ids) > 1 and \
+ is_plain_letter(table[codepoint.combining_ids[0]]) and \
+ all(is_mark(table[i]) for i in codepoint.combining_ids[1:])
+
+def is_letter(codepoint, table):
+ """Return true for letter with or without diacritical marks."""
+ return is_plain_letter(codepoint) or is_letter_with_marks(codepoint, table)
+
+def get_plain_letter(codepoint, table):
+ """Return the base codepoint without marks."""
+ if is_letter_with_marks(codepoint, table):
+ return table[codepoint.combining_ids[0]]
+ elif is_plain_letter(codepoint):
+ return codepoint
+ else:
+ raise "mu"
+
+def is_ligature(codepoint, table):
+ """Return true for letters combined with letters."""
+ return all(is_letter(table[i], table) for i in codepoint.combining_ids)
+
+def get_plain_letters(codepoint, table):
+ """Return a list of plain letters from a ligature."""
+ assert(is_ligature(codepoint, table))
+ return [get_plain_letter(table[id], table) for id in codepoint.combining_ids]
+
+def main(expand_ligatures):
+ # http://www.unicode.org/reports/tr44/tr44-14.html#Character_Decomposition_Mappings
+ decomposition_type_pattern = re.compile(" *<[^>]*> *")
+
+ table = {}
+ all = []
+
+ # read everything we need into memory
+ for line in sys.stdin.readlines():
+ fields = line.split(";")
+ if len(fields) > 5:
+ # http://www.unicode.org/reports/tr44/tr44-14.html#UnicodeData.txt
+ general_category = fields[2]
+ decomposition = fields[5]
+ decomposition = re.sub(decomposition_type_pattern, ' ', decomposition)
+ id = int(fields[0], 16)
+ combining_ids = [int(s, 16) for s in decomposition.split(" ") if s != ""]
+ codepoint = Codepoint(id, general_category, combining_ids)
+ table[id] = codepoint
+ all.append(codepoint)
+
+ # walk through all the codepoints looking for interesting mappings
+ for codepoint in all:
+ if codepoint.general_category.startswith('L') and \
+ len(codepoint.combining_ids) > 1:
+ if is_letter_with_marks(codepoint, table):
+ print_record(codepoint.id,
+ chr(get_plain_letter(codepoint, table).id))
+ elif expand_ligatures and is_ligature(codepoint, table):
+ print_record(codepoint.id,
+ "".join(unichr(combining_codepoint.id)
+ for combining_codepoint \
+ in get_plain_letters(codepoint, table)))
+
+ # some special cases
+ print_record(0x00d8, "O") # LATIN CAPITAL LETTER O WITH STROKE
+ print_record(0x00f8, "o") # LATIN SMALL LETTER O WITH STROKE
+ print_record(0x0110, "D") # LATIN CAPITAL LETTER D WITH STROKE
+ print_record(0x0111, "d") # LATIN SMALL LETTER D WITH STROKE
+ print_record(0x0131, "i") # LATIN SMALL LETTER DOTLESS I
+ print_record(0x0126, "H") # LATIN CAPITAL LETTER H WITH STROKE
+ print_record(0x0127, "h") # LATIN SMALL LETTER H WITH STROKE
+ print_record(0x0141, "L") # LATIN CAPITAL LETTER L WITH STROKE
+ print_record(0x0142, "l") # LATIN SMALL LETTER L WITH STROKE
+ print_record(0x0149, "'n") # LATIN SMALL LETTER N PRECEDED BY APOSTROPHE
+ print_record(0x0166, "T") # LATIN CAPITAL LETTER T WITH STROKE
+ print_record(0x0167, "t") # LATIN SMALL LETTER t WITH STROKE
+ print_record(0x0401, u"\u0415") # CYRILLIC CAPITAL LETTER IO
+ print_record(0x0451, u"\u0435") # CYRILLIC SMALL LETTER IO
+ if expand_ligatures:
+ print_record(0x00c6, "AE") # LATIN CAPITAL LETTER AE
+ print_record(0x00df, "ss") # LATIN SMALL LETTER SHARP S
+ print_record(0x00e6, "ae") # LATIN SMALL LETTER AE
+ print_record(0x0152, "OE") # LATIN CAPITAL LIGATURE OE
+ print_record(0x0153, "oe") # LATIN SMALL LIGATURE OE
+
+if __name__ == "__main__":
+ main(len(sys.argv) == 2 and sys.argv[1] == "--expand-ligatures")
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