Can you add java .class file decompiler plugin?

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PeterJones

The Notepad++ application developer doesn’t develop most of the plugins – he leaves it up to other people to develop plugins that they are interested in.

That said, “decompilers” are rather complicated applications on their own, and there’s no good reason to embed one as a “plugin” to a text editor. Find some external decompiler (if such a creature exists for a java .class), run it to produce the reverse-engineered source code, and open that resulting text-based file in Notepad++. I cannot see how having a plugin do it would make the process any easier than the two-step process I just described.

rdipardo

if such a creature exists for a java .class

Several, in fact: https://www.libhunt.com/l/java/topic/decompiler

I cannot see how having a plugin do it would make the process any easier

Maybe a script instead?

# -*- coding: utf-8 -*-

from __future__ import print_function # for py 2.7
import sys
import subprocess
import tempfile
from os import path
from Npp import notepad


"""
 Shells out to the Procyon decompiler and opens the generated source in Notepad++
 https://github.com/mstrobel/procyon/wiki/Java-Decompiler

 ASSUMPTIONS
 -----------
 1. a JAVA_HOME environment variable is set, or the path to java.exe is on the PATH
 2. procyon.jar is on the class path; otherwise provide the absolute path,
    e.g., r'C:\java\tools\procyon\0.5.36\procyon.jar'
"""
def show_decompiled():
    try:
        binary = notepad.prompt('File path to the compiled class/jar:', 'Java Decompiler Script', 'Hello.class')
        if binary is None:
            # assume current file is a Java source file that's been compiled *in situ*
            binary = path.splitext(notepad.getCurrentFilename())[0] + '.class'
        elif not path.exists(binary):
            raise IOError('Can''t find class/jar "%s"!' % binary)

        CMD = [
            'java',
            '-jar',
            'procyon.jar',
            '-dl', # debug line numbers
            binary
        ]

        if subprocess.check_call(CMD, shell=True) == 0:
            decompiled = subprocess.check_output(CMD, shell=True).decode('utf-8')
            _, java_src =  tempfile.mkstemp(suffix='.java', text=True)
            if java_src:
                with open(java_src, 'w') as file:
                    file.write(decompiled)

                notepad.open(java_src)

    except (subprocess.CalledProcessError, IOError) as exc:
        notepad.messageBox(str(exc), 'Java Decompiler Script')
        print(exc, file=sys.stderr)


if __name__ == '__main__':
    show_decompiled()

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