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#!/usr/bin/env python
# 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/.
# This script generates nsStyleStructList.h, which contains macro invocations
# that can be used for three things:
#
# 1. To generate code for each inherited style struct.
# 2. To generate code for each reset style struct.
# 3. To generate the dependency of each style struct.
from __future__ import print_function
import math
NORMAL_DEP = ["Variables"]
COLOR_DEP = ["Color"]
LENGTH_DEP = ["Font", "Visibility"]
# List of style structs and their corresponding Check callback functions,
# if any.
STYLE_STRUCTS = [("INHERITED",) + x for x in [
# Inherited style structs.
("Font", "CheckFontCallback", NORMAL_DEP + ["Visibility"]),
("Color", "CheckColorCallback", NORMAL_DEP),
("List", "nullptr", NORMAL_DEP + LENGTH_DEP),
("Text", "CheckTextCallback", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Visibility", "nullptr", NORMAL_DEP),
("UserInterface", "nullptr", NORMAL_DEP),
("TableBorder", "nullptr", NORMAL_DEP + LENGTH_DEP),
("SVG", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Variables", "CheckVariablesCallback",[]),
]] + [("RESET",) + x for x in [
# Reset style structs.
("Background", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Position", "nullptr", NORMAL_DEP + LENGTH_DEP),
("TextReset", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Display", "nullptr", NORMAL_DEP + LENGTH_DEP),
("Content", "nullptr", NORMAL_DEP + LENGTH_DEP),
("UIReset", "nullptr", NORMAL_DEP),
("Table", "nullptr", NORMAL_DEP),
("Margin", "nullptr", NORMAL_DEP + LENGTH_DEP),
("Padding", "nullptr", NORMAL_DEP + LENGTH_DEP),
("Border", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Outline", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("XUL", "nullptr", NORMAL_DEP),
("SVGReset", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Column", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
("Effects", "nullptr", NORMAL_DEP + LENGTH_DEP + COLOR_DEP),
]]
# ---- Generate nsStyleStructList.h ----
count = len(STYLE_STRUCTS)
# Check for problems with style struct dependencies
resolved_items = []
# This whole loop tries to sort the style structs in topological order
# according to the dependencies. A topological order exists iff there
# are no cyclic dependencies between the style structs. It resolves one
# struct each iteration, and append the resolved one to |resolved_items|.
for i in range(count):
# This inner loop picks one style struct which does not have
# unsolved dependencies. If nothing can be picked, then we
# must have some cyclic dependencies.
for j in range(count):
_, name, _, dependencies = STYLE_STRUCTS[j]
if name in resolved_items:
continue
# Check whether all dependencies of this item have been placed
for dep in dependencies:
if dep not in resolved_items:
break
else:
resolved_items.append(name)
break
else:
import sys
print("ERROR: Cannot resolve style struct dependencies", file=sys.stderr)
print("Resolved items:", " ".join(resolved_items), file=sys.stderr)
unsolved_items = [name for _, name, _, _ in STYLE_STRUCTS
if name not in resolved_items]
print("There exist cyclic dependencies between " +
"the following structs:", " ".join(unsolved_items), file=sys.stderr)
exit(1)
def printEntry(header, i):
print("STYLE_STRUCT_%s(%s, %s)" % STYLE_STRUCTS[i][:3], file=header)
for dep in STYLE_STRUCTS[i][3]:
print("STYLE_STRUCT_DEP(%s)" % (dep,), file=header)
print("STYLE_STRUCT_END()", file=header)
HEADER = """/* THIS FILE IS AUTOGENERATED BY generate-stylestructlist.py - DO NOT EDIT */
// IWYU pragma: private, include "nsStyleStructFwd.h"
/*
* list of structs that contain the data provided by nsStyleContext, the
* internal API for computed style data for an element
*/
/*
* This file is intended to be used by different parts of the code, with
* the STYLE_STRUCT macro (or the STYLE_STRUCT_INHERITED and
* STYLE_STRUCT_RESET pair of macros) defined in different ways.
*/
#ifndef STYLE_STRUCT_INHERITED
#define STYLE_STRUCT_INHERITED(name, checkdata_cb) \\
STYLE_STRUCT(name, checkdata_cb)
#define UNDEF_STYLE_STRUCT_INHERITED
#endif
#ifndef STYLE_STRUCT_RESET
#define STYLE_STRUCT_RESET(name, checkdata_cb) \\
STYLE_STRUCT(name, checkdata_cb)
#define UNDEF_STYLE_STRUCT_RESET
#endif
#ifndef STYLE_STRUCT_DEP
#define STYLE_STRUCT_DEP(dep)
#define UNDEF_STYLE_STRUCT_DEP
#endif
#ifndef STYLE_STRUCT_END
#define STYLE_STRUCT_END()
#define UNDEF_STYLE_STRUCT_END
#endif
// The inherited structs are listed before the Reset structs.
// nsStyleStructID assumes this is the case, and callers other than
// nsStyleStructFwd.h that want the structs in id-order just define
// STYLE_STRUCT rather than including the file twice.
"""
FOOTER = """
#ifdef UNDEF_STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_INHERITED
#undef UNDEF_STYLE_STRUCT_INHERITED
#endif
#ifdef UNDEF_STYLE_STRUCT_RESET
#undef STYLE_STRUCT_RESET
#undef UNDEF_STYLE_STRUCT_RESET
#endif
#ifdef UNDEF_STYLE_STRUCT_DEP
#undef STYLE_STRUCT_DEP
#undef UNDEF_STYLE_STRUCT_DEP
#endif
#ifdef UNDEF_STYLE_STRUCT_END
#undef STYLE_STRUCT_END
#undef UNDEF_STYLE_STRUCT_END
#endif
"""
def main(header):
print(HEADER, file=header)
for i in range(count):
printEntry(header, i)
print(FOOTER, file=header)
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