gecko-dev/accessible/xpcom/AccEventGen.py

#!/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/.

from __future__ import absolute_import
import os

import buildconfig
import mozpack.path as mozpath

from xpidl import xpidl

# Load the webidl configuration file.
glbl = {}
exec(open(mozpath.join(buildconfig.topsrcdir, 'dom', 'bindings', 'Bindings.conf')).read(), glbl)
webidlconfig = glbl['DOMInterfaces']

# Instantiate the parser.
p = xpidl.IDLParser()


def findIDL(includePath, interfaceFileName):
    for d in includePath:
        path = mozpath.join(d, interfaceFileName)
        if os.path.exists(path):
            return path
    raise BaseException("No IDL file found for interface %s "
                        "in include path %r"
                        % (interfaceFileName, includePath))


def loadEventIDL(parser, includePath, eventname):
    eventidl = ("nsIAccessible%s.idl" % eventname)
    idlFile = findIDL(includePath, eventidl)
    idl = p.parse(open(idlFile).read(), idlFile)
    idl.resolve(includePath, p, webidlconfig)
    return idl, idlFile


class Configuration:
    def __init__(self, filename):
        config = {}
        exec(open(filename).read(), config)
        self.simple_events = config.get('simple_events', [])


def firstCap(str):
    return str[0].upper() + str[1:]


def writeAttributeParams(a):
    return ("%s a%s" % (a.realtype.nativeType('in'), firstCap(a.name)))


def print_header_file(fd, conf, incdirs):
    idl_paths = set()

    fd.write("/* THIS FILE IS AUTOGENERATED - DO NOT EDIT */\n")
    fd.write("#ifndef _mozilla_a11y_generated_AccEvents_h_\n"
             "#define _mozilla_a11y_generated_AccEvents_h_\n\n")
    fd.write("#include \"nscore.h\"\n")
    fd.write("#include \"nsCOMPtr.h\"\n")
    fd.write("#include \"nsCycleCollectionParticipant.h\"\n")
    fd.write("#include \"nsString.h\"\n")
    for e in conf.simple_events:
        fd.write("#include \"nsIAccessible%s.h\"\n" % e)
    for e in conf.simple_events:
        idl, idl_path = loadEventIDL(p, incdirs, e)
        idl_paths.add(idl_path)
        for iface in filter(lambda p: p.kind == "interface", idl.productions):
            classname = ("xpcAcc%s" % e)
            baseinterfaces = interfaces(iface)

            fd.write("\nclass %s final : public %s\n" % (classname, iface.name))
            fd.write("{\n")
            fd.write("public:\n")

            attributes = allAttributes(iface)
            args = map(writeAttributeParams, attributes)
            fd.write("  %s(%s) :\n" % (classname, ", ".join(args)))

            initializers = []
            for a in attributes:
                initializers.append("m%s(a%s)" % (firstCap(a.name), firstCap(a.name)))
            fd.write("  %s\n  {}\n\n" % ", ".join(initializers))
            fd.write("  NS_DECL_CYCLE_COLLECTING_ISUPPORTS\n")
            fd.write("  NS_DECL_CYCLE_COLLECTION_CLASS(%s)\n" % (classname))

            for iface in filter(lambda i: i.name != "nsISupports", baseinterfaces):
                fd.write("  NS_DECL_%s\n" % iface.name.upper())

            fd.write("\nprivate:\n")
            fd.write("  ~%s() {}\n\n" % classname)
            for a in attributes:
                fd.write("  %s\n" % attributeVariableTypeAndName(a))
            fd.write("};\n\n")

    fd.write("#endif\n")

    return idl_paths


def interfaceAttributeTypes(idl):
    ifaces = filter(lambda p: p.kind == "interface", idl.productions)
    attributes = []
    for i in ifaces:
        ifaceAttributes = allAttributes(i)
        attributes.extend(ifaceAttributes)
    ifaceAttrs = filter(lambda a: a.realtype.nativeType("in").endswith("*"), attributes)
    return map(lambda a: a.realtype.nativeType("in").strip(" *"), ifaceAttrs)


def print_cpp(idl, fd, conf, eventname):
    for p in idl.productions:
        if p.kind == 'interface':
            write_cpp(eventname, p, fd)


def print_cpp_file(fd, conf, incdirs):
    idl_paths = set()
    fd.write("/* THIS FILE IS AUTOGENERATED - DO NOT EDIT */\n\n")
    fd.write('#include "xpcAccEvents.h"\n')

    includes = []
    for e in conf.simple_events:
        if e not in includes:
            includes.append(("nsIAccessible%s" % e))

    types = []
    for e in conf.simple_events:
        idl, idl_path = loadEventIDL(p, incdirs, e)
        idl_paths.add(idl_path)
        types.extend(interfaceAttributeTypes(idl))

    for c in types:
        fd.write("#include \"%s.h\"\n" % c)

    fd.write("\n")
    for e in conf.simple_events:
        idl, idl_path = loadEventIDL(p, incdirs, e)
        idl_paths.add(idl_path)
        print_cpp(idl, fd, conf, e)

    return idl_paths


def attributeVariableTypeAndName(a):
    if a.realtype.nativeType('in').endswith('*'):
        l = ["nsCOMPtr<%s> m%s;" % (a.realtype.nativeType('in').strip('* '),
                                    firstCap(a.name))]
    elif a.realtype.nativeType('in').count("nsAString"):
        l = ["nsString m%s;" % firstCap(a.name)]
    elif a.realtype.nativeType('in').count("nsACString"):
        l = ["nsCString m%s;" % firstCap(a.name)]
    else:
        l = ["%sm%s;" % (a.realtype.nativeType('in'),
                         firstCap(a.name))]
    return ", ".join(l)


def writeAttributeGetter(fd, classname, a):
    fd.write("NS_IMETHODIMP\n")
    fd.write("%s::Get%s(" % (classname, firstCap(a.name)))
    if a.realtype.nativeType('in').endswith('*'):
        fd.write("%s** a%s" % (a.realtype.nativeType('in').strip('* '), firstCap(a.name)))
    elif a.realtype.nativeType('in').count("nsAString"):
        fd.write("nsAString& a%s" % firstCap(a.name))
    elif a.realtype.nativeType('in').count("nsACString"):
        fd.write("nsACString& a%s" % firstCap(a.name))
    else:
        fd.write("%s*a%s" % (a.realtype.nativeType('in'), firstCap(a.name)))
    fd.write(")\n")
    fd.write("{\n")
    if a.realtype.nativeType('in').endswith('*'):
        fd.write("  NS_IF_ADDREF(*a%s = m%s);\n" % (firstCap(a.name), firstCap(a.name)))
    elif a.realtype.nativeType('in').count("nsAString"):
        fd.write("  a%s = m%s;\n" % (firstCap(a.name), firstCap(a.name)))
    elif a.realtype.nativeType('in').count("nsACString"):
        fd.write("  a%s = m%s;\n" % (firstCap(a.name), firstCap(a.name)))
    else:
        fd.write("  *a%s = m%s;\n" % (firstCap(a.name), firstCap(a.name)))
    fd.write("  return NS_OK;\n")
    fd.write("}\n\n")


def interfaces(iface):
    interfaces = []
    while iface.base:
        interfaces.append(iface)
        iface = iface.idl.getName(xpidl.TypeId(iface.base), iface.location)
    interfaces.append(iface)
    interfaces.reverse()
    return interfaces


def allAttributes(iface):
    attributes = []
    for i in interfaces(iface):
        attrs = filter(lambda m: isinstance(m, xpidl.Attribute), i.members)
        attributes.extend(attrs)

    return attributes


def write_cpp(eventname, iface, fd):
    classname = "xpcAcc%s" % eventname
    attributes = allAttributes(iface)
    ccattributes = filter(lambda m: m.realtype.nativeType('in').endswith('*'), attributes)
    fd.write("NS_IMPL_CYCLE_COLLECTION(%s" % classname)
    for c in ccattributes:
        fd.write(", m%s" % firstCap(c.name))
    fd.write(")\n\n")

    fd.write("NS_IMPL_CYCLE_COLLECTING_ADDREF(%s)\n" % classname)
    fd.write("NS_IMPL_CYCLE_COLLECTING_RELEASE(%s)\n\n" % classname)

    fd.write("NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(%s)\n" % classname)
    for baseiface in interfaces(iface):
        fd.write("  NS_INTERFACE_MAP_ENTRY(%s)\n" % baseiface.name)
    fd.write("NS_INTERFACE_MAP_END\n\n")

    for a in attributes:
        writeAttributeGetter(fd, classname, a)


def get_conf(conf_file):
    conf = Configuration(conf_file)
    inc_dir = [
        mozpath.join(buildconfig.topsrcdir, 'accessible', 'interfaces'),
        mozpath.join(buildconfig.topsrcdir, 'xpcom', 'base'),
    ]
    return conf, inc_dir


def gen_files(fd, conf_file):
    deps = set()
    conf, inc_dir = get_conf(conf_file)
    deps.update(print_header_file(fd, conf, inc_dir))
    with open(os.path.join(os.path.dirname(fd.name), 'xpcAccEvents.cpp'), 'w') as cpp_fd:
        deps.update(print_cpp_file(cpp_fd, conf, inc_dir))
    return deps