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#!/usr/bin/ruby
# Usage:
# $ wget http://www.unicode.org/Public/UNIDATA/CaseFolding.txt
# $ ruby case-folding.rb CaseFolding.txt -o casefold.h
class CaseFolding
module Util
module_function
def hex_seq(v)
v.map {|i| "0x%04x" % i}.join(", ")
end
def print_table_1(dest, data)
for k, v in data = data.sort
sk = (Array === k and k.length > 1) ? "{#{hex_seq(k)}}" : ("0x%04x" % k)
dest.print(" {#{sk}, {#{v.length}, {#{hex_seq(v)}}}},\n")
end
data
end
def print_table(dest, type, data)
dest.print("static const #{type}_Type #{type}_Table[] = {\n")
i = 0
ret = data.inject([]) do |a, (n, d)|
dest.print("#define #{n} (*(#{type}_Type (*)[#{d.size}])(#{type}_Table+#{i}))\n")
i += d.size
a.concat(print_table_1(dest, d))
end
dest.print("};\n\n")
ret
end
end
include Util
attr_reader :fold, :fold_locale, :unfold, :unfold_locale
def load(filename)
pattern = /([0-9A-F]{4,6}); ([CFT]); ([0-9A-F]{4,6})(?: ([0-9A-F]{4,6}))?(?: ([0-9A-F]{4,6}))?;/
@fold = fold = {}
@unfold = unfold = [{}, {}, {}]
turkic = []
IO.foreach(filename) do |line|
next unless res = pattern.match(line)
ch_from = res[1].to_i(16)
if res[2] == 'T'
# Turkic case folding
turkic << ch_from
next
end
# store folding data
ch_to = res[3..6].inject([]) do |a, i|
break a unless i
a << i.to_i(16)
end
fold[ch_from] = ch_to
# store unfolding data
i = ch_to.length - 1
(unfold[i][ch_to] ||= []) << ch_from
end
# move locale dependent data to (un)fold_locale
@fold_locale = fold_locale = {}
@unfold_locale = unfold_locale = [{}, {}]
for ch_from in turkic
key = fold[ch_from]
i = key.length - 1
unfold_locale[i][i == 0 ? key[0] : key] = unfold[i].delete(key)
fold_locale[ch_from] = fold.delete(ch_from)
end
self
end
def range_check(code)
"#{code} <= MAX_CODE_VALUE && #{code} >= MIN_CODE_VALUE"
end
def lookup_hash(key, type, data)
hash = "onigenc_unicode_#{key}_hash"
lookup = "onigenc_unicode_#{key}_lookup"
arity = Array(data[0][0]).size
gperf = %W"gperf -7 -k#{[*1..(arity*3)].join(",")} -F,-1 -c -j1 -i1 -t -T -E -C -H #{hash} -N #{lookup} -n"
argname = arity > 1 ? "codes" : "code"
argdecl = "const OnigCodePoint #{arity > 1 ? "*": ""}#{argname}"
n = 7
m = (1 << n) - 1
min, max = data.map {|c, *|c}.flatten.minmax
src = IO.popen(gperf, "r+") {|f|
f << "short\n%%\n"
data.each_with_index {|(k, _), i|
k = Array(k)
ks = k.map {|j| [(j >> n*2) & m, (j >> n) & m, (j) & m]}.flatten.map {|c| "\\x%.2x" % c}.join("")
f.printf "\"%s\", ::::/*%s*/ %d\n", ks, k.map {|c| "0x%.4x" % c}.join(","), i
}
f << "%%\n"
f.close_write
f.read
}
src.sub!(/^(#{hash})\s*\(.*?\).*?\n\{\n(.*)^\}/m) {
name = $1
body = $2
body.gsub!(/\(unsigned char\)str\[(\d+)\]/, "bits_#{arity > 1 ? 'at' : 'of'}(#{argname}, \\1)")
"#{name}(#{argdecl})\n{\n#{body}}"
}
src.sub!(/const short *\*\n^(#{lookup})\s*\(.*?\).*?\n\{\n(.*)^\}/m) {
name = $1
body = $2
body.sub!(/\benum\s+\{(\n[ \t]+)/, "\\&MIN_CODE_VALUE = 0x#{min.to_s(16)},\\1""MAX_CODE_VALUE = 0x#{max.to_s(16)},\\1")
body.gsub!(/(#{hash})\s*\(.*?\)/, "\\1(#{argname})")
body.gsub!(/\{"",-1}/, "-1")
body.gsub!(/\{"(?:[^"]|\\")+", *::::(.*)\}/, '\1')
body.sub!(/(\s+if\s)\(len\b.*\)/) do
"#$1(" <<
(arity > 1 ? (0...arity).map {|i| range_check("#{argname}[#{i}]")}.join(" &&\n ") : range_check(argname)) <<
")"
end
v = nil
body.sub!(/(if\s*\(.*MAX_HASH_VALUE.*\)\n([ \t]*))\{(.*?)\n\2\}/m) {
pre = $1
indent = $2
s = $3
s.sub!(/const char *\* *(\w+)( *= *wordlist\[\w+\]).\w+/, 'short \1 = wordlist[key]')
v = $1
s.sub!(/\bif *\(.*\)/, "if (#{v} >= 0 && code#{arity}_equal(#{argname}, #{key}_Table[#{v}].from))")
"#{pre}{#{s}\n#{indent}}"
}
body.sub!(/\b(return\s+&)([^;]+);/, '\1'"#{key}_Table[#{v}].to;")
"static const #{type} *\n#{name}(#{argdecl})\n{\n#{body}}"
}
src
end
def display(dest)
# print the header
dest.print("/* DO NOT EDIT THIS FILE. */\n")
dest.print("/* Generated by enc/unicode/case-folding.rb */\n\n")
# print folding data
# CaseFold + CaseFold_Locale
name = "CaseFold_11"
data = print_table(dest, name, "CaseFold"=>fold, "CaseFold_Locale"=>fold_locale)
dest.print lookup_hash(name, "CodePointList3", data)
# print unfolding data
# CaseUnfold_11 + CaseUnfold_11_Locale
name = "CaseUnfold_11"
data = print_table(dest, name, name=>unfold[0], "#{name}_Locale"=>unfold_locale[0])
dest.print lookup_hash(name, "CodePointList3", data)
# CaseUnfold_12 + CaseUnfold_12_Locale
name = "CaseUnfold_12"
data = print_table(dest, name, name=>unfold[1], "#{name}_Locale"=>unfold_locale[1])
dest.print lookup_hash(name, "CodePointList2", data)
# CaseUnfold_13
name = "CaseUnfold_13"
data = print_table(dest, name, name=>unfold[2])
dest.print lookup_hash(name, "CodePointList2", data)
end
def self.load(*args)
new.load(*args)
end
end
if $0 == __FILE__
require 'optparse'
dest = nil
fold_1 = false
ARGV.options do |opt|
opt.banner << " [INPUT]"
opt.on("--output-file=FILE", "-o", "output to the FILE instead of STDOUT") {|output|
dest = (output unless output == '-')
}
opt.parse!
abort(opt.to_s) if ARGV.size > 1
end
filename = ARGV[0] || 'CaseFolding.txt'
data = CaseFolding.load(filename)
if dest
open(dest, "wb") do |f|
data.display(f)
end
else
data.display(STDOUT)
end
end
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