|
| 1 | +#!/usr/bin/python |
| 2 | +# |
| 3 | +# This script builds unaccent.rules on standard output when given the |
| 4 | +# contents of UnicodeData.txt[1] on standard input. Optionally includes |
| 5 | +# ligature expansion, if --expand-ligatures is given on the command line. |
| 6 | +# |
| 7 | +# The approach is to use the Unicode decomposition data to identify |
| 8 | +# precomposed codepoints that are equivalent to a ligature of several |
| 9 | +# letters, or a base letter with any number of diacritical marks. |
| 10 | +# There is also a small set of special cases for codepoints that we |
| 11 | +# traditionally support even though Unicode doesn't consider them to |
| 12 | +# be ligatures or letters with marks. |
| 13 | +# |
| 14 | +# [1] http://unicode.org/Public/7.0.0/ucd/UnicodeData.txt |
| 15 | + |
| 16 | +importre |
| 17 | +importsys |
| 18 | + |
| 19 | +defprint_record(codepoint,letter): |
| 20 | +print (unichr(codepoint)+"\t"+letter).encode("UTF-8") |
| 21 | + |
| 22 | +classCodepoint: |
| 23 | +def__init__(self,id,general_category,combining_ids): |
| 24 | +self.id=id |
| 25 | +self.general_category=general_category |
| 26 | +self.combining_ids=combining_ids |
| 27 | + |
| 28 | +defis_plain_letter(codepoint): |
| 29 | +"""Return true if codepoint represents a plain ASCII letter.""" |
| 30 | +return (codepoint.id>=ord('a')andcodepoint.id<=ord('z'))or \ |
| 31 | + (codepoint.id>=ord('A')andcodepoint.id<=ord('Z')) |
| 32 | + |
| 33 | +defis_mark(codepoint): |
| 34 | +"""Returns true for diacritical marks (combining codepoints).""" |
| 35 | +returncodepoint.general_categoryin ("Mn","Me","Mc") |
| 36 | + |
| 37 | +defis_letter_with_marks(codepoint,table): |
| 38 | +"""Returns true for plain letters combined with one or more marks.""" |
| 39 | +# See http://www.unicode.org/reports/tr44/tr44-14.html#General_Category_Values |
| 40 | +returnlen(codepoint.combining_ids)>1and \ |
| 41 | +is_plain_letter(table[codepoint.combining_ids[0]])and \ |
| 42 | +all(is_mark(table[i])foriincodepoint.combining_ids[1:]) |
| 43 | + |
| 44 | +defis_letter(codepoint,table): |
| 45 | +"""Return true for letter with or without diacritical marks.""" |
| 46 | +returnis_plain_letter(codepoint)oris_letter_with_marks(codepoint,table) |
| 47 | + |
| 48 | +defget_plain_letter(codepoint,table): |
| 49 | +"""Return the base codepoint without marks.""" |
| 50 | +ifis_letter_with_marks(codepoint,table): |
| 51 | +returntable[codepoint.combining_ids[0]] |
| 52 | +elifis_plain_letter(codepoint): |
| 53 | +returncodepoint |
| 54 | +else: |
| 55 | +raise"mu" |
| 56 | + |
| 57 | +defis_ligature(codepoint,table): |
| 58 | +"""Return true for letters combined with letters.""" |
| 59 | +returnall(is_letter(table[i],table)foriincodepoint.combining_ids) |
| 60 | + |
| 61 | +defget_plain_letters(codepoint,table): |
| 62 | +"""Return a list of plain letters from a ligature.""" |
| 63 | +assert(is_ligature(codepoint,table)) |
| 64 | +return [get_plain_letter(table[id],table)foridincodepoint.combining_ids] |
| 65 | + |
| 66 | +defmain(expand_ligatures): |
| 67 | +# http://www.unicode.org/reports/tr44/tr44-14.html#Character_Decomposition_Mappings |
| 68 | +decomposition_type_pattern=re.compile(" *<[^>]*> *") |
| 69 | + |
| 70 | +table= {} |
| 71 | +all= [] |
| 72 | + |
| 73 | +# read everything we need into memory |
| 74 | +forlineinsys.stdin.readlines(): |
| 75 | +fields=line.split(";") |
| 76 | +iflen(fields)>5: |
| 77 | +# http://www.unicode.org/reports/tr44/tr44-14.html#UnicodeData.txt |
| 78 | +general_category=fields[2] |
| 79 | +decomposition=fields[5] |
| 80 | +decomposition=re.sub(decomposition_type_pattern,' ',decomposition) |
| 81 | +id=int(fields[0],16) |
| 82 | +combining_ids= [int(s,16)forsindecomposition.split(" ")ifs!=""] |
| 83 | +codepoint=Codepoint(id,general_category,combining_ids) |
| 84 | +table[id]=codepoint |
| 85 | +all.append(codepoint) |
| 86 | + |
| 87 | +# walk through all the codepoints looking for interesting mappings |
| 88 | +forcodepointinall: |
| 89 | +ifcodepoint.general_category.startswith('L')and \ |
| 90 | +len(codepoint.combining_ids)>1: |
| 91 | +ifis_letter_with_marks(codepoint,table): |
| 92 | +print_record(codepoint.id, |
| 93 | +chr(get_plain_letter(codepoint,table).id)) |
| 94 | +elifexpand_ligaturesandis_ligature(codepoint,table): |
| 95 | +print_record(codepoint.id, |
| 96 | +"".join(unichr(combining_codepoint.id) |
| 97 | +forcombining_codepoint \ |
| 98 | +inget_plain_letters(codepoint,table))) |
| 99 | + |
| 100 | +# some special cases |
| 101 | +print_record(0x00d8,"O")# LATIN CAPITAL LETTER O WITH STROKE |
| 102 | +print_record(0x00f8,"o")# LATIN SMALL LETTER O WITH STROKE |
| 103 | +print_record(0x0110,"D")# LATIN CAPITAL LETTER D WITH STROKE |
| 104 | +print_record(0x0111,"d")# LATIN SMALL LETTER D WITH STROKE |
| 105 | +print_record(0x0131,"i")# LATIN SMALL LETTER DOTLESS I |
| 106 | +print_record(0x0126,"H")# LATIN CAPITAL LETTER H WITH STROKE |
| 107 | +print_record(0x0127,"h")# LATIN SMALL LETTER H WITH STROKE |
| 108 | +print_record(0x0141,"L")# LATIN CAPITAL LETTER L WITH STROKE |
| 109 | +print_record(0x0142,"l")# LATIN SMALL LETTER L WITH STROKE |
| 110 | +print_record(0x0149,"'n")# LATIN SMALL LETTER N PRECEDED BY APOSTROPHE |
| 111 | +print_record(0x0166,"T")# LATIN CAPITAL LETTER T WITH STROKE |
| 112 | +print_record(0x0167,"t")# LATIN SMALL LETTER t WITH STROKE |
| 113 | +print_record(0x0401,u"\u0415")# CYRILLIC CAPITAL LETTER IO |
| 114 | +print_record(0x0451,u"\u0435")# CYRILLIC SMALL LETTER IO |
| 115 | +ifexpand_ligatures: |
| 116 | +print_record(0x00c6,"AE")# LATIN CAPITAL LETTER AE |
| 117 | +print_record(0x00df,"ss")# LATIN SMALL LETTER SHARP S |
| 118 | +print_record(0x00e6,"ae")# LATIN SMALL LETTER AE |
| 119 | +print_record(0x0152,"OE")# LATIN CAPITAL LIGATURE OE |
| 120 | +print_record(0x0153,"oe")# LATIN SMALL LIGATURE OE |
| 121 | + |
| 122 | +if__name__=="__main__": |
| 123 | +main(len(sys.argv)==2andsys.argv[1]=="--expand-ligatures") |