1 files changed, 70 insertions, 0 deletions
diff --git a/chromium/third_party/skia/third_party/harfbuzz/contrib/tables/unicode_parse_common.py b/chromium/third_party/skia/third_party/harfbuzz/contrib/tables/unicode_parse_common.py
new file mode 100644
index 00000000000..ac26ecae3d9
--- /dev/null
+++ b/chromium/third_party/skia/third_party/harfbuzz/contrib/tables/unicode_parse_common.py
@@ -0,0 +1,70 @@
+def lines_get(f):
+  '''Parse a file like object, removing comments and returning a list of
+     lines.'''
+  def cut_comment(line):
+    first_hash = line.find('#')
+    if first_hash == -1:
+      return line
+    return line[:first_hash]
+
+  return [x for x in [cut_comment(x[:-1]) for x in f.readlines()] if len(x)]
+
+def line_split(line):
+  '''Split a line based on a semicolon separator.'''
+  def normalise(word):
+    return word.lstrip().rstrip()
+  return [normalise(x) for x in line.split(';')]
+
+def codepoints_parse(token):
+  '''Parse a Unicode style code-point range. Return either a single value or a
+     tuple of (start, end) for a range of code-points.'''
+  def fromHex(token):
+    return int(token, 16)
+  parts = token.split('..')
+  if len(parts) == 2:
+    return (fromHex(parts[0]), fromHex(parts[1]))
+  elif len(parts) == 1:
+    return fromHex(parts[0])
+  else:
+    raise ValueError(token)
+
+def unicode_file_parse(input, map, default_value = None):
+  '''Parse a file like object, @input where the first column is a code-point
+     range and the second column is mapped via the given dict, @map.'''
+  ranges = []
+  tokens = [line_split(x) for x in lines_get(input)]
+  for line in tokens:
+    if len(line) == 2:
+      codepoints = codepoints_parse(line[0])
+      value = map[line[1]]
+      if value == default_value:
+        continue
+
+      if type(codepoints) == int:
+        codepoints = (codepoints, codepoints)
+
+      ranges.append((codepoints[0], codepoints[1], value))
+    else:
+      raise ValueError(line)
+
+  return ranges
+
+def sort_and_merge(ranges):
+  '''Given a list of (start, end, value), merge elements where the ranges are
+     continuous and the values are the same.'''
+  output = []
+  ranges.sort()
+  current = None
+  for v in ranges:
+    if current is None:
+      current = v
+      continue
+    if current[1] + 1 == v[0] and current[2] == v[2]:
+      current = (current[0], v[1], v[2])
+    else:
+      output.append(current)
+      current = v
+  if current is not None:
+    output.append(current)
+
+  return output