layout/style/ServoCSSPropList.mako.py
author Emilio Cobos Álvarez <emilio@crisal.io>
Thu, 27 Jun 2019 20:24:02 +0200
changeset 543425 2086a08e77feeeaddcff0399deef434ac2e8c17e
parent 530791 441551c28fbf1decc68fcbafd9676c3ab62932f1
child 549818 abe0d15df80fa37934832fb3ed3cdaa9f9687b3c
permissions -rw-r--r--
Bug 1562269 - Serialize grid-auto-rows / grid-auto-columns with Servo. r=boris Two less properties, now that we're not using nsStyleCoord for them we can do this. Unfortunately the grid resolved value code needs to serialize it still, so this doesn't remove as much code. Also fix the script since the generated file was renamed. Differential Revision: https://phabricator.services.mozilla.com/D36349

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

def _assign_slots(obj, args):
    for i, attr in enumerate(obj.__slots__):
        setattr(obj, attr, args[i])


class Longhand(object):
    __slots__ = ["name", "method", "id", "flags", "pref"]

    def __init__(self, *args):
        _assign_slots(self, args)

    @staticmethod
    def type():
        return "longhand"


class Shorthand(object):
    __slots__ = ["name", "method", "id", "flags", "pref", "subprops"]

    def __init__(self, *args):
        _assign_slots(self, args)

    @staticmethod
    def type():
        return "shorthand"


class Alias(object):
    __slots__ = ["name", "method", "alias_id", "prop_id", "flags", "pref"]

    def __init__(self, *args):
        _assign_slots(self, args)

    @staticmethod
    def type():
        return "alias"

<%!
# See bug 1454823 for situation of internal flag.
def is_internal(prop):
    # A property which is not controlled by pref and not enabled in
    # content by default is an internal property.
    if not prop.gecko_pref and not prop.enabled_in_content():
        return True
    # There are some special cases we may want to remove eventually.
    OTHER_INTERNALS = [
        "-moz-context-properties",
        "-moz-control-character-visibility",
    ]
    return prop.name in OTHER_INTERNALS

def method(prop):
    if prop.name == "float":
        return "CssFloat"
    if prop.name.startswith("-x-"):
        return prop.camel_case[1:]
    return prop.camel_case

# TODO(emilio): Get this to zero.
LONGHANDS_NOT_SERIALIZED_WITH_SERVO = [
    # Servo serializes one value when both are the same, a few tests expect two.
    "border-spacing",

    # Resolved value should be zero when the column-rule-style is none.
    "column-rule-width",

    # These resolve auto to zero in a few cases, but not all.
    "max-block-size",
    "max-height",
    "max-inline-size",
    "max-width",
    "min-block-size",
    "min-height",
    "min-inline-size",
    "min-width",

    # resistfingerprinting stuff.
    "-moz-osx-font-smoothing",
]

def serialized_by_servo(prop):
    # If the property requires layout information, no such luck.
    if "GETCS_NEEDS_LAYOUT_FLUSH" in prop.flags:
        return False
    if prop.type() == "shorthand":
        # FIXME: Need to serialize a value interpolated with currentcolor
        # properly to be able to use text-decoration, and figure out what to do
        # with relative mask urls.
        return prop.name != "text-decoration" and prop.name != "mask"
    # Keywords are all fine, except -moz-osx-font-smoothing, which does
    # resistfingerprinting stuff.
    if prop.keyword and prop.name != "-moz-osx-font-smoothing":
        return True
    return prop.name not in LONGHANDS_NOT_SERIALIZED_WITH_SERVO

def exposed_on_getcs(prop):
    if prop.type() == "longhand":
        return not is_internal(prop)
    # TODO: bug 137688 / https://github.com/w3c/csswg-drafts/issues/2529
    if prop.type() == "shorthand":
        return "SHORTHAND_IN_GETCS" in prop.flags

def flags(prop):
    result = []
    if prop.explicitly_enabled_in_chrome():
        result.append("EnabledInUASheetsAndChrome")
    elif prop.explicitly_enabled_in_ua_sheets():
        result.append("EnabledInUASheets")
    if is_internal(prop):
        result.append("Internal")
    if prop.enabled_in == "":
        result.append("Inaccessible")
    if "GETCS_NEEDS_LAYOUT_FLUSH" in prop.flags:
        result.append("GetCSNeedsLayoutFlush")
    if "CAN_ANIMATE_ON_COMPOSITOR" in prop.flags:
        result.append("CanAnimateOnCompositor")
    if exposed_on_getcs(prop):
        result.append("ExposedOnGetCS")
        if serialized_by_servo(prop):
            result.append("SerializedByServo")
    if prop.type() == "longhand" and prop.logical:
        result.append("IsLogical")
    return ", ".join('"{}"'.format(flag) for flag in result)

def pref(prop):
    if prop.gecko_pref:
        return '"' + prop.gecko_pref + '"'
    return '""'

def sub_properties(prop):
    return ", ".join('"{}"'.format(p.ident) for p in prop.sub_properties)
%>

data = [
    % for prop in data.longhands:
    Longhand("${prop.name}", "${method(prop)}", "${prop.ident}", [${flags(prop)}], ${pref(prop)}),
    % endfor

    % for prop in data.shorthands:
    Shorthand("${prop.name}", "${prop.camel_case}", "${prop.ident}", [${flags(prop)}], ${pref(prop)},
              [${sub_properties(prop)}]),
    % endfor

    % for prop in data.all_aliases():
    Alias("${prop.name}", "${prop.camel_case}", "${prop.ident}", "${prop.original.ident}", [], ${pref(prop)}),
    % endfor
]