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# coding: utf-8
# Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst ([email protected])
# Script to generate Ruby data structures used in implementing
# String#unicode_normalize,...
# Constants for input and ouput directory
InputDataDir = '../enc/unicode/data'
OuputDataDir = '../lib/unicode_normalize'
# convenience methods
class Integer
def to_UTF8() # convert to string, taking legibility into account
if self>0xFFFF
"\\u{#{to_s(16).upcase}}"
elsif self>0x7f
"\\u#{to_s(16).upcase.rjust(4, '0')}"
else
chr.sub(/[\\\"]/, '\\\&')
end
end
end
class Array
def line_slice (new_line) # joins items, 16 items per line
each_slice(16).collect(&:join).join new_line
end
def to_UTF8() collect(&:to_UTF8).join end
def to_regexp_chars # converts an array of Integers to character ranges
sort.inject([]) do |ranges, value|
if ranges.last and ranges.last[1]+1>=value
ranges.last[1] = value
ranges
else
ranges << [value, value]
end
end.collect do |first, last|
case last-first
when 0
first.to_UTF8
when 1
first.to_UTF8 + last.to_UTF8
else
first.to_UTF8 + '-' + last.to_UTF8
end
end.line_slice "\" \\\n \""
end
end
class Hash
def to_hash_string
collect do |key, value|
"\"#{key.to_UTF8}\"=>\"#{value.to_UTF8}\", "
end.line_slice "\n "
end
end
# read the file 'CompositionExclusions.txt'
composition_exclusions = IO.readlines("#{InputDataDir}/CompositionExclusions.txt")
.select { |line| line =~ /^[A-Z0-9]{4,5}/ }
.collect { |line| line.split(' ').first.hex }
decomposition_table = {}
kompatible_table = {}
CombiningClass = {} # constant to allow use in Integer#to_UTF8
# read the file 'UnicodeData.txt'
IO.foreach("#{InputDataDir}/UnicodeData.txt") do |line|
codepoint, name, _2, char_class, _4, decomposition, *_rest = line.split(";")
case decomposition
when /^[0-9A-F]/
decomposition_table[codepoint.hex] = decomposition.split(' ').collect(&:hex)
when /^</
kompatible_table[codepoint.hex] = decomposition.split(' ').drop(1).collect(&:hex)
end
CombiningClass[codepoint.hex] = char_class.to_i if char_class != "0"
if name=~/(First|Last)>$/ and (char_class!="0" or decomposition!="")
warn "Unexpected: Character range with data relevant to normalization!"
end
end
# calculate compositions from decompositions
composition_table = decomposition_table.reject do |character, decomposition|
composition_exclusions.member? character or # predefined composition exclusion
decomposition.length<=1 or # Singleton Decomposition
CombiningClass[character] or # character is not a Starter
CombiningClass[decomposition.first] # decomposition begins with a character that is not a Starter
end.invert
# recalculate composition_exclusions
composition_exclusions = decomposition_table.keys - composition_table.values
accent_array = CombiningClass.keys + composition_table.keys.collect(&:last)
composition_starters = composition_table.keys.collect(&:first)
hangul_no_trailing = 0xAC00.step(0xD7A3, 28).to_a
# expand decomposition table values
decomposition_table.each do |key, value|
position = 0
while position < value.length
if decomposition = decomposition_table[value[position]]
decomposition_table[key] = value = value.dup # avoid overwriting composition_table key
value[position, 1] = decomposition
else
position += 1
end
end
end
# deal with relationship between canonical and kompatibility decompositions
decomposition_table.each do |key, value|
value = value.dup
expanded = false
position = 0
while position < value.length
if decomposition = kompatible_table[value[position]]
value[position, 1] = decomposition
expanded = true
else
position += 1
end
end
kompatible_table[key] = value if expanded
end
class_table_str = CombiningClass.collect do |key, value|
"\"#{key.to_UTF8}\"=>#{value}, "
end.line_slice "\n "
# generate normalization tables file
open("#{OuputDataDir}/normalize_tables.rb", "w").print <<MAPPING_TABLE_FILE_END
# coding: us-ascii
# automatically generated by tool/unicode_norm_gen.rb
module Normalize
accents = "" \\
"[#{accent_array.to_regexp_chars}]" \\
""
ACCENTS = accents
REGEXP_D_STRING = "\#{'' # composition starters and composition exclusions
}" \\
"[#{(composition_table.values+composition_exclusions).to_regexp_chars}]\#{accents}*" \\
"|\#{'' # characters that can be the result of a composition, except composition starters
}" \\
"[#{(composition_starters-composition_table.values).to_regexp_chars}]?\#{accents}+" \\
"|\#{'' # precomposed Hangul syllables
}" \\
"[\\u{AC00}-\\u{D7A4}]" \\
""
REGEXP_C_STRING = "\#{'' # composition exclusions
}" \\
"[#{composition_exclusions.to_regexp_chars}]\#{accents}*" \\
"|\#{'' # composition starters and characters that can be the result of a composition
}" \\
"[#{(composition_starters+composition_table.values).to_regexp_chars}]?\#{accents}+" \\
"|\#{'' # Hangul syllables with separate trailer
}" \\
"[#{hangul_no_trailing.to_regexp_chars}][\\u11A8-\\u11C2]" \\
"|\#{'' # decomposed Hangul syllables
}" \\
"[\\u1100-\\u1112][\\u1161-\\u1175][\\u11A8-\\u11C2]?" \\
""
REGEXP_K_STRING = "" \\
"[#{kompatible_table.keys.to_regexp_chars}]" \\
""
class_table = {
#{class_table_str}
}
class_table.default = 0
CLASS_TABLE = class_table
DECOMPOSITION_TABLE = {
#{decomposition_table.to_hash_string}
}
KOMPATIBLE_TABLE = {
#{kompatible_table.to_hash_string}
}
COMPOSITION_TABLE = {
#{composition_table.to_hash_string}
}
end
MAPPING_TABLE_FILE_END
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