#!/usr/bin/python2
#
# Copyright 2016 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Tool to collect some additional character usage data from cldr.

Punctuation used with a language that we want to investigate includes
ellipsis, delimiters (quote start/end), and separators in list patterns.
If cldr specifies characters here, we want to require it in the fonts."""

import collections
import glob
import os
from os import path
import sys
import xml.etree.cElementTree as ET

from nototools import cldr_data
from nototools import tool_utils
from nototools import unicode_data

TOOLS_DIR = path.abspath(path.join(path.dirname(__file__), os.pardir))
CLDR_DIR = path.join(TOOLS_DIR, 'third_party', 'cldr')

def _add_text(chars, text):
  skip = False
  for i, cp in enumerate(text):
    if cp == '{':
      skip = True
      continue
    if cp == '}':
      skip = False
      continue
    if not skip:
      if cp == ' ':
        continue
      script = unicode_data.script(cp)
      if script == 'Zyyy':
        chars.add(cp)


def _collect_punct_data(tree):
  chars = set()
  for tag in tree.findall('characters/ellipsis'):
    _add_text(chars, tag.text)
  for tag in tree.findall('characters/moreInformation'):
    _add_text(chars, tag.text)
  for tag in tree.findall('delimiters'):
    for t in tag:
      _add_text(chars, t.text)
  for tag in tree.findall('listPatterns/listPattern/listPatternPart'):
    _add_text(chars, tag.text)
  return chars


def _collect_currency_data(tree):
  currencies = set()
  for tag in tree.findall('numbers/currencies/currency/symbol'):
    if len(tag.text) == 1:
      currencies.add(tag.text)
  return currencies


def _get_cldr_files(cldr_dirs):
  files = set()
  for cldr_dir in cldr_dirs:
    search = path.join(CLDR_DIR, 'common', cldr_dir, '*.xml')
    files.update(glob.glob(search))
  return files


def _collect_script_to_punct(files):
  """Builds script to punct from provided cldr files.  Builds 'LGC'
  data from component scripts.  Adds ASCII single and double quotes if
  corresponding quotes are in the punct."""

  script_to_punct = collections.defaultdict(set)
  curly_quotes_to_standard = [
      (frozenset([unichr(0x2018), unichr(0x2019)]), frozenset(['\''])),
      (frozenset([unichr(0x201C), unichr(0x201D)]), frozenset(['"'])),
  ]
  for f in files:
    tree = ET.parse(f)
    punct = _collect_punct_data(tree)
    if punct:
      filename = path.splitext(path.basename(f))[0]
      script = cldr_data.get_likely_script(filename)
      if script == 'Zzzz':
        if filename != 'root':
          print >> sys.stderr, 'no script for %s' % filename
      else:
        script_to_punct[script] |= punct

  script_to_punct['LGC'] = set(
      script_to_punct['Latn'] |
      script_to_punct['Grek'] |
      script_to_punct['Cyrl'])

  for script in script_to_punct:
    punct = script_to_punct[script]
    for curly, standard in curly_quotes_to_standard:
      if curly & punct:
        punct.update(standard)

  return script_to_punct


def _build_script_to_punct():
  files = _get_cldr_files(['main'])
  script_to_punct = _collect_script_to_punct(files)
  return {
      script: frozenset(script_to_punct[script])
      for script in script_to_punct
  }


_script_to_punct = None
def script_to_punct():
  global _script_to_punct
  if not _script_to_punct:
    _script_to_punct = _build_script_to_punct()
  return _script_to_punct


def _write_script_to_punct(script_to_punct):
  print 'SCRIPT_TO_PUNCT = {'
  for script in sorted(script_to_punct):
    chars = script_to_punct[script]
    int_chars = [ord(cp) for cp in chars]
    print '  # %s' % ('|'.join(sorted(chars)))
    print "  '%s': '%s'," % (script, tool_utils.write_int_ranges(int_chars))
  print '}'


def main():
  _write_script_to_punct(_build_script_to_punct())


if __name__ == "__main__":
    main()
