layout/style/GenerateComputedDOMStyleGenerated.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3 # You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 import runpy
   6
   7
   8 def generate(output, dataFile):
   9     output.write(
  10         """/* THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT */
  11
  12 /* processed file that defines entries for nsComputedDOMStyle, designed
  13    to be #included in nsComputedDOMStyle.cpp */
  14
  15 static constexpr Entry kEntries[] = {
  16 """
  17     )
  18
  19     def exposed_on_getcs(p):
  20         return "ExposedOnGetCS" in p.flags
  21
  22     def order_key(p):
  23         # Put prefixed properties after normal properties.
  24         # The spec is unclear about this, and Blink doesn't have any sensible
  25         # order at all, so it probably doesn't matter a lot. But originally
  26         # Gecko put then later so we do so as well. See w3c/csswg-drafts#2827.
  27         order = p.name.startswith("-")
  28         return (order, p.name)
  29
  30     def has_cpp_getter(p):
  31         if "SerializedByServo" in p.flags:
  32             return False
  33         if p.type() == "longhand" and "IsLogical" in p.flags:
  34             return False
  35         return True
  36
  37     # Some special cases we may get rid of later. See bug 1471423.
  38     def method(p):
  39         if p.id.startswith("margin_"):
  40             return "{}Width".format(p.method)
  41         if p.id.startswith("_moz_"):
  42             method = p.method[3:]
  43         else:
  44             method = p.method
  45         if p.id.startswith("_moz_outline_radius_"):
  46             method = method.replace("left", "Left")
  47             method = method.replace("right", "Right")
  48         return method
  49
  50     def getter_entry(p):
  51         if has_cpp_getter(p):
  52             return "DoGet" + method(p)
  53         # Put a dummy getter here instead of nullptr because MSVC seems
  54         # to have bug which ruins the table when we put nullptr for
  55         # pointer-to-member-function. See bug 1471426.
  56         return "DummyGetter"
  57
  58     properties = runpy.run_path(dataFile)["data"]
  59     properties = filter(exposed_on_getcs, properties)
  60
  61     TEMPLATE = "  {{ eCSSProperty_{}, &nsComputedDOMStyle::{} }},\n"
  62     for p in sorted(properties, key=order_key):
  63         output.write(TEMPLATE.format(p.id, getter_entry(p)))
  64
  65     output.write("};\n")