codePoints = require 'codepoints'

fs = require 'fs'

UnicodeTrieBuilder = require 'unicode-trie/builder'

log2 = Math.log2 or (n) ->

Math.log(n) / Math.LN2

bits = (n) ->

(log2(n) + 1) | 0

categories = {}

combiningClasses = {}

scripts = {}

eaws = {}

categoryCount = 0

combiningClassCount = 0

scriptCount = 0

eawCount = 0

for codePoint in codePoints when codePoint?

categories[codePoint.category] ?= categoryCount++

combiningClasses[codePoint.combiningClassName] ?= combiningClassCount++

scripts[codePoint.script] ?= scriptCount++

eaws[codePoint.eastAsianWidth] ?= eawCount++

numberBits = 10

categoryBits = bits(categoryCount - 1)

combiningClassBits = bits(combiningClassCount - 1)

bidiMirrorBits = 1

scriptBits = bits(scriptCount - 1)

eawBits = bits(eawCount - 1)

categoryShift = combiningClassBits + scriptBits + eawBits + numberBits

combiningShift = scriptBits + eawBits + numberBits

scriptShift = eawBits + numberBits

eawShift = numberBits

numericValue = (numeric) ->

if numeric

if m = numeric.match /^(\-?\d+)\/(\d+)$/

# fraction

num = parseInt m[1]

den = parseInt m[2]

((num + 12) << 4) + (den - 1)

else if /^\d0+$/.test numeric

# base 10

mant = parseInt numeric[0]

exp = numeric.length - 1

((mant + 14) << 5) + (exp - 2)

else

val = parseInt numeric

if val <= 50

1 + val

else

# base 60

mant = val

exp = 0

while (mant % 60) is 0

mant /= 60

++exp

((mant + 0xbf) << 2) + (exp - 1)

else

0

trie = new UnicodeTrieBuilder

for codePoint in codePoints when codePoint?

category = categories[codePoint.category]

combiningClass = combiningClasses[codePoint.combiningClassName] or 0

script = scripts[codePoint.script] or 0

eaw = eaws[codePoint.eastAsianWidth] or 0

val = (category << categoryShift) |

(combiningClass << combiningShift) |

(script << scriptShift) |

(eaw << eawShift) |

numericValue(codePoint.numeric)

trie.set codePoint.code, val

fs.writeFileSync 'data.trie', trie.toBuffer()

fs.writeFileSync 'data.json', JSON.stringify

categories: Object.keys(categories)

combiningClasses: Object.keys(combiningClasses)

scripts: Object.keys(scripts)

eaw: Object.keys(eaws)