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enums.py
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enums.py
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#!/usr/bin/env python3
# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
import os
ENUMS = {
"Direction": ["Inherit", "LTR", "RTL"],
"Unit": ["Undefined", "Point", "Percent", "Auto"],
"FlexDirection": ["Column", "ColumnReverse", "Row", "RowReverse"],
"Justify": [
"FlexStart",
"Center",
"FlexEnd",
"SpaceBetween",
"SpaceAround",
"SpaceEvenly",
],
"Overflow": ["Visible", "Hidden", "Scroll"],
"Align": [
"Auto",
"FlexStart",
"Center",
"FlexEnd",
"Stretch",
"Baseline",
"SpaceBetween",
"SpaceAround",
"SpaceEvenly",
],
"PositionType": ["Static", "Relative", "Absolute"],
"Display": ["Flex", "None", "Contents"],
"Wrap": ["NoWrap", "Wrap", "WrapReverse"],
"BoxSizing": ["BorderBox", "ContentBox"],
"MeasureMode": ["Undefined", "Exactly", "AtMost"],
"Dimension": ["Width", "Height"],
"Edge": [
"Left",
"Top",
"Right",
"Bottom",
"Start",
"End",
"Horizontal",
"Vertical",
"All",
],
"NodeType": ["Default", "Text"],
"LogLevel": ["Error", "Warn", "Info", "Debug", "Verbose", "Fatal"],
"ExperimentalFeature": [
# Mimic web flex-basis behavior (experiment may be broken)
"WebFlexBasis",
],
"Gutter": ["Column", "Row", "All"],
# Known incorrect behavior which can be enabled for compatibility
"Errata": [
# Default: Standards conformant mode
("None", 0),
# Allows main-axis flex basis to be stretched without flexGrow being
# set (previously referred to as "UseLegacyStretchBehaviour")
("StretchFlexBasis", 1 << 0),
# Absolute position in a given axis will be relative to the padding
# edge of the parent container instead of the content edge when a
# specific inset (top/bottom/left/right) is not set.
("AbsolutePositionWithoutInsetsExcludesPadding", 1 << 1),
# Absolute nodes will resolve percentages against the inner size of
# their containing node, not the padding box
("AbsolutePercentAgainstInnerSize", 1 << 2),
# Enable all incorrect behavior (preserve compatibility)
("All", 0x7FFFFFFF),
# Enable all errata except for "StretchFlexBasis" (Defaults behavior
# before Yoga 2.0)
("Classic", 0x7FFFFFFF & (~(1 << 0))),
],
}
DO_NOT_STRIP = ["LogLevel"]
BITSET_ENUMS = ["Errata"]
def get_license(ext):
return f"""{"/**" if ext == "js" else "/*"}
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// @{"generated"} by enums.py
{"// clang-format off" if ext == "cpp" else ""}
"""
def _format_name(symbol, delimiter=None, transform=None):
symbol = str(symbol)
out = ""
for i in range(0, len(symbol)):
c = symbol[i]
if str.istitle(c) and i != 0 and not str.istitle(symbol[i - 1]):
out += delimiter or ""
if transform is None:
out += c
else:
out += getattr(c, transform)()
return out
def to_java_upper(symbol):
return _format_name(symbol, "_", "upper")
def to_hyphenated_lower(symbol):
return _format_name(symbol, "-", "lower")
root = os.path.dirname(os.path.abspath(__file__))
# write out C & Objective-C headers
with open(root + "/yoga/YGEnums.h", "w") as f:
f.write(get_license("cpp"))
f.write("#pragma once\n")
f.write("#include <yoga/YGMacros.h>\n\n")
f.write("YG_EXTERN_C_BEGIN\n\n")
items = sorted(ENUMS.items())
for name, values in items:
f.write("YG_ENUM_DECL(\n")
f.write(" YG%s,\n" % name)
for value in values:
if isinstance(value, tuple):
f.write(" YG%s%s = %d" % (name, value[0], value[1]))
else:
f.write(" YG%s%s" % (name, value))
if value == values[-1]:
f.write(")\n")
else:
f.write(",\n")
if name in BITSET_ENUMS:
f.write("YG_DEFINE_ENUM_FLAG_OPERATORS(YG%s)\n" % name)
f.write("\n")
f.write("YG_EXTERN_C_END\n")
# Write out C++ scoped enums
for name, values in sorted(ENUMS.items()):
with open(f"{root}/yoga/enums/{name}.h", "w") as f:
f.write(get_license("cpp"))
f.write("#pragma once\n\n")
f.write("#include <cstdint>\n")
f.write("#include <yoga/YGEnums.h>\n")
f.write("#include <yoga/enums/YogaEnums.h>\n\n")
f.write("namespace facebook::yoga {\n\n")
width = "uint32_t" if name in BITSET_ENUMS else "uint8_t"
f.write(f"enum class {name} : {width} {{\n")
for value in values:
ordinal = value[0] if isinstance(value, tuple) else value
f.write(f" {ordinal} = YG{name}{ordinal},\n")
f.write("};\n\n")
if name in BITSET_ENUMS:
f.write(f"YG_DEFINE_ENUM_FLAG_OPERATORS({name})\n\n")
else:
f.write("template <>\n")
f.write(f"constexpr int32_t ordinalCount<{name}>() {{\n")
f.write(f" return {len(values)};\n")
f.write("}\n\n")
f.write(f"constexpr {name} scopedEnum(YG{name} unscoped) {{\n")
f.write(f" return static_cast<{name}>(unscoped);\n")
f.write("}\n\n")
f.write(f"constexpr YG{name} unscopedEnum({name} scoped) {{\n")
f.write(f" return static_cast<YG{name}>(scoped);\n")
f.write("}\n\n")
f.write(f"inline const char* toString({name} e) {{\n")
f.write(f" return YG{name}ToString(unscopedEnum(e));\n")
f.write("}\n\n")
f.write("} // namespace facebook::yoga\n")
# write out C body for printing
with open(root + "/yoga/YGEnums.cpp", "w") as f:
f.write(get_license("cpp"))
f.write("#include <yoga/YGEnums.h>\n\n")
items = sorted(ENUMS.items())
for name, values in items:
f.write("const char* YG%sToString(const YG%s value) {\n" % (name, name))
f.write(" switch (value) {\n")
for value in values:
if isinstance(value, tuple):
f.write(" case YG%s%s:\n" % (name, value[0]))
f.write(' return "%s";\n' % to_hyphenated_lower(value[0]))
else:
f.write(" case YG%s%s:\n" % (name, value))
f.write(' return "%s";\n' % to_hyphenated_lower(value))
f.write(" }\n")
f.write(' return "unknown";\n')
f.write("}\n")
if name != items[-1][0]:
f.write("\n")
# write out java files
for name, values in sorted(ENUMS.items()):
with open(root + "/java/com/facebook/yoga/Yoga%s.java" % name, "w") as f:
f.write(get_license("java"))
f.write("package com.facebook.yoga;\n\n")
if name in DO_NOT_STRIP:
f.write("import com.facebook.yoga.annotations.DoNotStrip;\n\n")
f.write("@DoNotStrip\n")
f.write("public enum Yoga%s {\n" % name)
if len(values) > 0:
for value in values:
if isinstance(value, tuple):
f.write(" %s(%d)" % (to_java_upper(value[0]), value[1]))
else:
f.write(" %s(%d)" % (to_java_upper(value), values.index(value)))
if values.index(value) is len(values) - 1:
f.write(";\n")
else:
f.write(",\n")
else:
f.write("__EMPTY(-1);")
f.write("\n")
f.write(" private final int mIntValue;\n")
f.write("\n")
f.write(" Yoga%s(int intValue) {\n" % name)
f.write(" mIntValue = intValue;\n")
f.write(" }\n")
f.write("\n")
f.write(" public int intValue() {\n")
f.write(" return mIntValue;\n")
f.write(" }\n")
f.write("\n")
if name in DO_NOT_STRIP:
f.write(" @DoNotStrip\n")
f.write(" public static Yoga%s fromInt(int value) {\n" % name)
f.write(" switch (value) {\n")
for value in values:
if isinstance(value, tuple):
f.write(
" case %d: return %s;\n" % (value[1], to_java_upper(value[0]))
)
else:
f.write(
" case %d: return %s;\n"
% (values.index(value), to_java_upper(value))
)
f.write(
' default: throw new IllegalArgumentException("Unknown enum value: " + value);\n'
)
f.write(" }\n")
f.write(" }\n")
f.write("}\n")
# write out TypeScript file
with open(root + "/javascript/src/generated/YGEnums.ts", "w") as f:
f.write(get_license("js"))
enums = sorted(ENUMS.items())
for enum_name, ordinals in enums:
f.write(f"export enum {enum_name} {{\n")
for ordinal_index, ordinal in enumerate(ordinals):
ordinal_name = ordinal[0] if isinstance(ordinal, tuple) else ordinal
ordinal_value = ordinal[1] if isinstance(ordinal, tuple) else ordinal_index
f.write(f" {ordinal_name} = {ordinal_value},\n")
f.write("}\n\n")
f.write("const constants = {\n")
for enum_name, ordinals in enums:
for ordinal in ordinals:
ordinal_name = ordinal[0] if isinstance(ordinal, tuple) else ordinal
ordinal_value = ordinal[1] if isinstance(ordinal, tuple) else ordinal_index
f.write(
f" {to_java_upper(enum_name)}_{to_java_upper(ordinal_name)}: {enum_name}.{ordinal_name},\n"
)
f.write("}\n")
f.write("export default constants")