#!/usr/bin/env python3
# Script to generate scintilla/src/CharacterCategoryMap.cxx and lexilla/lexlib/CharacterCategory.cxx
# from Python's Unicode data
# Should be run rarely when a Python with a new version of Unicode data is available.
# Requires Python 3.6 or later
# Should not be run with old versions of Python.

import pathlib, platform, sys, unicodedata

from FileGenerator import Regenerate

def findCategories(filename):
    with filename.open(encoding="UTF-8") as infile:
        lines = [x.strip() for x in infile if "\tcc" in x]
    values = "".join(lines).replace(" ","").split(",")
    print("Categrories:", values)
    return [v[2:] for v in values]

def updateCharacterCategory(filename):
    values = ["// Created with Python %s,  Unicode %s" % (
        platform.python_version(), unicodedata.unidata_version)]

    startRange = 0
    category = unicodedata.category(chr(startRange))
    table = []
    for ch in range(sys.maxunicode):
        uch = chr(ch)
        current = unicodedata.category(uch)
        if current != category:
            value = startRange * 32 + categories.index(category)
            table.append(value)
            category = current
            startRange = ch
    value = startRange * 32 + categories.index(category)
    table.append(value)

    # the sentinel value is used to simplify CharacterCategoryMap::Optimize()
    category = 'Cn'
    value = (sys.maxunicode + 1)*32 + categories.index(category)
    table.append(value)

    values.extend(["%d," % value for value in table])

    Regenerate(filename, "//", values)


scintillaDirectory = pathlib.Path(__file__).resolve().parent.parent

categories = findCategories(scintillaDirectory / "src" / "CharacterCategoryMap.h")

updateCharacterCategory(scintillaDirectory / "src" / "CharacterCategoryMap.cxx")

updateCharacterCategory(scintillaDirectory.parent / "lexilla" / "lexlib" / "CharacterCategory.cxx")
