layout/style/GenerateServoCSSPropList.py
author Xidorn Quan <me@upsuper.org>
Wed, 27 Jun 2018 15:34:29 +1000
changeset 423872 7b6bf8c652f36b7a356279b0db58981d6573ec7b
parent 423871 9773c4edc6a652c68f4a549d4d8713b7f5543925
permissions -rw-r--r--
Bug 1471114 part 2 - Generate ComputedStyleMap entry list from property data. r=emilio This changes the order of properties returned from gCS. The old order doesn't make much sense, and other browsers don't agree on an identical order either, so it should be trivial to change it. Also the spec isn't super clear / useful in this case. Several -moz-prefixed properties are excluded from the list due to their being internal. I suspect they are never accessible anyway, so probably nothing gets changed by this. MozReview-Commit-ID: 9LfangjpJ3P

# 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 http://mozilla.org/MPL/2.0/.

import buildconfig
import mozpack.path as mozpath
import os
import runpy
import subprocess
import string
import sys

SERVO_BASE = mozpath.join(buildconfig.topsrcdir, "servo")
SERVO_PROP_BASE = mozpath.join(SERVO_BASE, "components", "style", "properties")


def generate_data(output, template):
    output.write("# THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT\n\n")
    output.write(subprocess.check_output([
        sys.executable,
        mozpath.join(SERVO_PROP_BASE, "build.py"),
        "gecko", "geckolib", template
    ], universal_newlines=True))

    # Add all relevant files into the dependencies of the generated file.
    DEP_EXTS = [".py", ".rs", ".zip"]
    deps = set()
    for path, dirs, files in os.walk(SERVO_PROP_BASE):
        for file in files:
            if os.path.splitext(file)[1] in DEP_EXTS:
                deps.add(mozpath.join(path, file))
    return deps


def generate_header(output, data):
    data = runpy.run_path(data)["data"]

    output.write("""/* THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT */

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#define CSS_PROP_DOMPROP_PREFIXED(name_) \\
  CSS_PROP_PUBLIC_OR_PRIVATE(Moz ## name_, name_)

#ifndef CSS_PROP_LONGHAND
#define CSS_PROP_LONGHAND(name_, id_, method_, flags_, pref_) /* nothing */
#define DEFINED_CSS_PROP_LONGHAND
#endif

#ifndef CSS_PROP_SHORTHAND
#define CSS_PROP_SHORTHAND(name_, id_, method_, flags_, pref_) /* nothing */
#define DEFINED_CSS_PROP_SHORTHAND
#endif

#ifndef CSS_PROP_ALIAS
#define CSS_PROP_ALIAS(name_, aliasid_, id_, method_, pref_) /* nothing */
#define DEFINED_CSS_PROP_ALIAS
#endif

""")

    # Some flags are only used for code generation, so we don't need to
    # expose them to runtime.
    COMPILE_TIME_FLAGS = {"ExposedOnGetCS"}

    MACRO_NAMES = {
        "longhand": "CSS_PROP_LONGHAND",
        "shorthand": "CSS_PROP_SHORTHAND",
        "alias": "CSS_PROP_ALIAS",
    }
    for prop in data:
        is_internal = "Internal" in prop.flags
        pref = '"' + prop.pref + '"'
        if prop.type() == "alias":
            params = [prop.name, prop.alias_id, prop.prop_id, prop.method, pref]
        else:
            method = prop.method
            if method == "CssFloat":
                method = "CSS_PROP_PUBLIC_OR_PRIVATE(CssFloat, Float)"
            elif method.startswith("Moz"):
                method = "CSS_PROP_DOMPROP_PREFIXED({})".format(method[3:])
            flags = " | ".join("CSSPropFlags::{}".format(flag)
                               for flag in prop.flags
                               if flag not in COMPILE_TIME_FLAGS)
            if not flags:
                flags = "CSSPropFlags(0)"
            params = [prop.name, prop.id, method, flags, pref]

        if is_internal:
            output.write("#ifndef CSS_PROP_LIST_EXCLUDE_INTERNAL\n")
        output.write("{}({})\n".format(MACRO_NAMES[prop.type()], ", ".join(params)))
        if is_internal:
            output.write("#endif\n")

    output.write("""
#ifdef DEFINED_CSS_PROP_ALIAS
#undef CSS_PROP_ALIAS
#undef DEFINED_CSS_PROP_ALIAS
#endif

#ifdef DEFINED_CSS_PROP_SHORTHAND
#undef CSS_PROP_SHORTHAND
#undef DEFINED_CSS_PROP_SHORTHAND
#endif

#ifdef DEFINED_CSS_PROP_LONGHAND
#undef CSS_PROP_LONGHAND
#undef DEFINED_CSS_PROP_LONGHAND
#endif

#undef CSS_PROP_DOMPROP_PREFIXED
""")