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