kc3-lang/md4c/scripts/build_folding_map.py

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• Hash : 72dad97e
  Author :
  Date : 2020-05-20T16:44:07
  

  scripts/build_folding_map.py: Handle properly "ranges" of length 2. Update the data structures in md_get_unicode_fold_info() to reflect the update in the script and handle the previously omitted characters. Fixes #113.

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• scripts/build_folding_map.py

• #!/usr/bin/env python3
  
  import os
  import sys
  import textwrap
  
  
  self_path = os.path.dirname(os.path.realpath(__file__));
  f = open(self_path + "/unicode/CaseFolding.txt", "r")
  
  status_list = [ "C", "F" ]
  
  folding_list = [ dict(), dict(), dict() ]
  
  # Filter the foldings for "full" folding.
  for line in f:
      comment_off = line.find("#")
      if comment_off >= 0:
          line = line[:comment_off]
      line = line.strip()
      if not line:
          continue
  
      raw_codepoint, status, raw_mapping, ignored_tail = line.split(";", 3)
      if not status.strip() in status_list:
          continue
      codepoint = int(raw_codepoint.strip(), 16)
      mapping = [int(it, 16) for it in raw_mapping.strip().split(" ")]
      mapping_len = len(mapping)
  
      if mapping_len in range(1, 4):
          folding_list[mapping_len-1][codepoint] = mapping
      else:
          assert(False)
  f.close()
  
  
  # If we assume that range (index0 ... index-1) makes a range, check that index
  # is compatible with it too.
  #
  # We are capable to handle ranges which:
  #
  # (1) either form consecutive sequence of codepoints and which map that range
  #     to other consecutive range of codepoints;
  #
  # (2) or consecutive range of codepoints with step 2 where each codepoint
  #     CP is mapped to the next codepoint CP+1
  #     (e.g. 0x1234 -> 0x1235; 0x1236 -> 0x1238; ...).
  #
  # (If the mappings have multiple codepoints, only the 1st mapped codepoint is
  # considered and all the other ones have to be the same for the whole range.)
  def is_range_compatible(folding, codepoint_list, index0, index):
      N = index - index0
      codepoint0 = codepoint_list[index0]
      codepoint1 = codepoint_list[index0+1]
      codepointN = codepoint_list[index]
      mapping0 = folding[codepoint0]
      mapping1 = folding[codepoint1]
      mappingN = folding[codepointN]
  
      # Check the range type (1):
      if codepoint1 - codepoint0 == 1 and codepointN - codepoint0 == N                \
              and mapping1[0] - mapping0[0] == 1 and mapping1[1:] == mapping0[1:]     \
              and mappingN[0] - mapping0[0] == N and mappingN[1:] == mapping0[1:]:
          return True
  
      # Check the range type (2):
      if codepoint1 - codepoint0 == 2 and codepointN - codepoint0 == 2 * N            \
              and mapping0[0] - codepoint0 == 1                                       \
              and mapping1[0] - codepoint1 == 1 and mapping1[1:] == mapping0[1:]      \
              and mappingN[0] - codepointN == 1 and mappingN[1:] == mapping0[1:]:
          return True
  
      return False
  
  
  def mapping_str(list, mapping):
      return ",".join("0x{:04x}".format(x) for x in mapping)
  
  for mapping_len in range(1, 4):
      folding = folding_list[mapping_len-1]
      codepoint_list = list(folding)
  
      index0 = 0
      count = len(folding)
  
      records = list()
      data_records = list()
  
      while index0 < count:
          index1 = index0 + 1
          while index1 < count and is_range_compatible(folding, codepoint_list, index0, index1):
              index1 += 1
  
          if index1 - index0 > 2:
              # Range of codepoints
              records.append("R(0x{:04x},0x{:04x})".format(codepoint_list[index0], codepoint_list[index1-1]))
              data_records.append(mapping_str(data_records, folding[codepoint_list[index0]]))
              data_records.append(mapping_str(data_records, folding[codepoint_list[index1-1]]))
              index0 = index1
          else:
              # Single codepoint
              records.append("S(0x{:04x})".format(codepoint_list[index0]))
              data_records.append(mapping_str(data_records, folding[codepoint_list[index0]]))
              index0 += 1
  
      sys.stdout.write("static const unsigned FOLD_MAP_{}[] = {{\n".format(mapping_len))
      sys.stdout.write("\n".join(textwrap.wrap(", ".join(records), 110,
                          initial_indent = "    ", subsequent_indent="    ")))
      sys.stdout.write("\n};\n")
  
      sys.stdout.write("static const unsigned FOLD_MAP_{}_DATA[] = {{\n".format(mapping_len))
      sys.stdout.write("\n".join(textwrap.wrap(", ".join(data_records), 110,
                          initial_indent = "    ", subsequent_indent="    ")))
      sys.stdout.write("\n};\n")
  
  
  
  

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