GenerateComputedDOMStyleGenerated.py (2555B)
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 FILE = """/* THIS IS AN AUTOGENERATED FILE. DO NOT EDIT */ 8 9 /* processed file that defines entries for nsComputedDOMStyle, designed 10 to be #included in nsComputedDOMStyle.cpp */ 11 12 static constexpr size_t kEntryIndices[eCSSProperty_COUNT] = {{ 13 {indices} 14 }}; 15 16 {asserts} 17 18 static constexpr Entry kEntries[eCSSProperty_COUNT] = {{ 19 {entries} 20 }}; 21 """ 22 23 24 def generate(output, dataFile): 25 def order_key(p): 26 # Put prefixed properties after normal properties. 27 # The spec is unclear about this, and Blink doesn't have any sensible 28 # order at all, so it probably doesn't matter a lot. But originally 29 # Gecko put then later so we do so as well. See w3c/csswg-drafts#2827. 30 order = p.name.startswith("-") 31 return (order, p.name) 32 33 def has_cpp_getter(p): 34 if not "ExposedOnGetCS" in p.flags: 35 return False 36 if "SerializedByServo" in p.flags: 37 return False 38 if p.type() == "longhand" and "IsLogical" in p.flags: 39 return False 40 return True 41 42 def getter_entry(p): 43 if has_cpp_getter(p): 44 return "DoGet" + p.method 45 # Put a dummy getter here instead of nullptr because MSVC seems 46 # to have bug which ruins the table when we put nullptr for 47 # pointer-to-member-function. See bug 1471426. 48 return "DummyGetter" 49 50 properties = runpy.run_path(dataFile)["data"] 51 52 entries = [] 53 indices = [] 54 asserts = [] 55 index_map = {} 56 non_aliases = list(filter(lambda p: p.type() != "alias", properties.values())) 57 for i, p in enumerate(sorted(non_aliases, key=order_key)): 58 can_be_exposed = "true" if "ExposedOnGetCS" in p.flags else "false" 59 entries.append( 60 "{{ eCSSProperty_{}, {}, &nsComputedDOMStyle::{}}}".format( 61 p.id, can_be_exposed, getter_entry(p) 62 ) 63 ) 64 index_map[p.id] = i 65 i += 1 66 67 for i, p in enumerate(non_aliases): 68 indices.append(str(index_map[p.id])) 69 asserts.append( 70 'static_assert(size_t(eCSSProperty_{}) == {}, "");'.format(p.id, i) 71 ) 72 73 assert len(indices) == len(entries) 74 75 output.write( 76 FILE.format( 77 indices=", ".join(indices), 78 entries=",\n ".join(entries), 79 asserts="\n".join(asserts), 80 ) 81 )