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#!/usr/bin/python3
#
# Copyright 2020, The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Converts a method to a descriptor or vice-versa.
eg:
% echo 'void myclass.foobar(long, java.lang.Object)' | method-to-descriptor.py
Lmyclass;->foobar(jLjaga/lang/Object;)V
% echo 'Lmyclass;->foobar(j)V' | method2descriptor.py -r
void myclass.foobar(long)
"""
import argparse
import sys
def GetStdinLineIter():
"""reads from stdin"""
return map(str.strip, sys.stdin)
def readDescriptor(s):
"""Reads a single descriptor and returns the string starting at the point after the descriptor"""
if s[0] == "[":
inner, rest = readDescriptor(s[1:])
return "[" + inner, rest
elif s[0] == "L":
type_end = s.index(";")
return s[:type_end + 1], s[type_end + 1:]
else:
assert s[0] in {"B", "C", "D", "F", "I", "J", "S", "Z", "V"}, s[0]
return s[0], s[1:]
# Descriptor to name for basic types
TYPE_MAP = {
"V": "void",
"B": "byte",
"C": "char",
"D": "double",
"F": "float",
"I": "int",
"J": "long",
"S": "short",
"Z": "boolean"
}
# Name to descriptor
DESC_MAP = dict((y, x) for x, y in TYPE_MAP.items())
def TypeDescriptorToName(desc):
"""Turn a single type descirptor into a name"""
if desc[0] == "[":
inner = TypeDescriptorToName(desc[1:])
return inner + "[]"
elif desc[0] == "L":
assert desc[-1] == ";", desc
return desc[1:-1].replace("/", ".")
else:
return TYPE_MAP[desc]
def DescriptorToName(desc):
"""Turn a method descriptor into a name"""
class_name, rest = readDescriptor(desc)
assert rest[0:2] == "->", desc
rest = rest[2:]
args_start = rest.index("(")
func_name = rest[:args_start]
rest = rest[args_start + 1:]
args = []
while rest[0] != ")":
cur_arg, rest = readDescriptor(rest)
args.append(cur_arg)
rest = rest[1:]
return_type, rest = readDescriptor(rest)
assert rest.strip() == "", desc
return "{} {}.{}({})".format(
TypeDescriptorToName(return_type), TypeDescriptorToName(class_name),
func_name, ",".join(map(TypeDescriptorToName, args)))
def SingleNameToDescriptor(name):
if name in DESC_MAP:
return DESC_MAP[name]
elif name.endswith("[]"):
return "[" + SingleNameToDescriptor(name[:-2])
elif name == "":
return ""
else:
return "L" + name.replace(".", "/") + ";"
def NameToDescriptor(desc):
return_name = desc.split()[0]
name_and_args = desc.split()[1]
args_start = name_and_args.index("(")
names = name_and_args[0:args_start]
meth_split = names.rfind(".")
class_name = names[:meth_split]
meth_name = names[meth_split + 1:]
args = map(str.strip, name_and_args[args_start + 1:-1].split(","))
return "{}->{}({}){}".format(
SingleNameToDescriptor(class_name), meth_name,
"".join(map(SingleNameToDescriptor, args)),
SingleNameToDescriptor(return_name))
def main():
parser = argparse.ArgumentParser(
"method-to-descriptor.py",
description="Convert a java method-name/stream into it's descriptor or vice-versa."
)
parser.add_argument(
"-r",
"--reverse",
dest="reverse",
action="store_true",
default=False,
help="reverse. Go from descriptor to method-declaration")
parser.add_argument("method", help="what to change", nargs="*")
args = parser.parse_args()
if args.method != []:
inputs = iter(args.method)
else:
inputs = GetStdinLineIter()
for name in inputs:
if args.reverse:
print(DescriptorToName(name))
else:
print(NameToDescriptor(name))
if __name__ == "__main__":
main()
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