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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
#!/usr/bin/env python2.7 -E
# -*- coding: utf-8 -*-
# Launch script for Jython. It may be wrapped as an executable with
# tools like PyInstaller, creating jython.exe, or run directly. The
# installer will make this the default launcher under the name
# bin/jython if CPython 2.7 is available with the above shebang
# invocation.
import glob
import inspect
import os
import os.path
import pipes
import shlex
import subprocess
import sys
from collections import OrderedDict
is_windows = os.name == "nt" or (os.name == "java" and os._name == "nt")
def parse_launcher_args(args):
class Namespace(object):
pass
parsed = Namespace()
parsed.java = []
parsed.properties = OrderedDict()
parsed.boot = False
parsed.jdb = False
parsed.help = False
parsed.print_requested = False
parsed.profile = False
parsed.jdb = None
it = iter(args)
next(it) # ignore sys.argv[0]
i = 1
while True:
try:
arg = next(it)
except StopIteration:
break
if arg.startswith("-D"):
k, v = arg[2:].split("=")
parsed.properties[k] = v
i += 1
elif arg in ("-J-classpath", "-J-cp"):
try:
next_arg = next(it)
except StopIteration:
bad_option("Argument expected for -J-classpath option")
if next_arg.startswith("-"):
bad_option("Bad option for -J-classpath")
parsed.classpath = next_arg
i += 2
elif arg.startswith("-J-Xmx"):
parsed.mem = arg[2:]
i += 1
elif arg.startswith("-J-Xss"):
parsed.stack = arg[2:]
i += 1
elif arg.startswith("-J"):
parsed.java.append(arg[2:])
i += 1
elif arg == "--print":
parsed.print_requested = True
i += 1
elif arg in ("-h", "--help"):
parsed.help = True
elif arg in ("--boot", "--jdb", "--profile"):
setattr(parsed, arg[2:], True)
i += 1
elif arg == "--":
i += 1
break
else:
break
return parsed, args[i:]
class JythonCommand(object):
def __init__(self, args, jython_args):
self.args = args
self.jython_args = jython_args
@property
def uname(self):
if hasattr(self, "_uname"):
return self._uname
if is_windows:
self._uname = "windows"
else:
uname = subprocess.check_output(["uname"]).strip().lower()
if uname.startswith("cygwin"):
self._uname = "cygwin"
else:
self._uname = uname
return self._uname
@property
def java_home(self):
if not hasattr(self, "_java_home"):
self.setup_java_command()
return self._java_home
@property
def java_command(self):
if not hasattr(self, "_java_command"):
self.setup_java_command()
return self._java_command
def setup_java_command(self):
if self.args.help:
self._java_home = None
self._java_command = "java"
return
if "JAVA_HOME" not in os.environ:
self._java_home = None
self._java_command = "jdb" if self.args.jdb else "java"
else:
self._java_home = os.environ["JAVA_HOME"]
if self.uname == "cygwin":
self._java_command = "jdb" if self.args.jdb else "java"
else:
self._java_command = os.path.join(
self.java_home, "bin",
"jdb" if self.args.jdb else "java")
@property
def executable(self):
"""Path to executable"""
if hasattr(self, "_executable"):
return self._executable
# Modified from
# http://stackoverflow.com/questions/3718657/how-to-properly-determine-current-script-directory-in-python/22881871#22881871
if getattr(sys, "frozen", False): # py2exe, PyInstaller, cx_Freeze
path = os.path.abspath(sys.executable)
else:
def inspect_this(): pass
path = inspect.getabsfile(inspect_this)
self._executable = os.path.realpath(path)
return self._executable
@property
def jython_home(self):
if hasattr(self, "_jython_home"):
return self._jython_home
if "JYTHON_HOME" in os.environ:
self._jython_home = os.environ["JYTHON_HOME"]
else:
self._jython_home = os.path.dirname(os.path.dirname(self.executable))
if self.uname == "cygwin":
self._jython_home = subprocess.check_output(["cygpath", "--windows", self._jython_home]).strip()
return self._jython_home
@property
def jython_opts():
return os.environ.get("JYTHON_OPTS", "")
@property
def classpath_delimiter(self):
return ";" if (is_windows or self.uname == "cygwin") else ":"
@property
def jython_jars(self):
if hasattr(self, "_jython_jars"):
return self._jython_jars
if os.path.exists(os.path.join(self.jython_home, "jython-dev.jar")):
jars = [os.path.join(self.jython_home, "jython-dev.jar")]
if self.args.boot:
# Wildcard expansion does not work for bootclasspath
for jar in glob.glob(os.path.join(self.jython_home, "javalib", "*.jar")):
jars.append(jar)
else:
jars.append(os.path.join(self.jython_home, "javalib", "*"))
elif not os.path.exists(os.path.join(self.jython_home, "jython.jar")):
bad_option("""{jython_home} contains neither jython-dev.jar nor jython.jar.
Try running this script from the 'bin' directory of an installed Jython or
setting {envvar_specifier}JYTHON_HOME.""".format(
jython_home=self.jython_home,
envvar_specifier="%" if self.uname == "windows" else "$"))
else:
jars = [os.path.join(self.jython_home, "jython.jar")]
self._jython_jars = jars
return self._jython_jars
@property
def java_classpath(self):
if hasattr(self.args, "classpath"):
return self.args.classpath
else:
return os.environ.get("CLASSPATH", ".")
@property
def java_mem(self):
if hasattr(self.args, "mem"):
return self.args.mem
else:
return os.environ.get("JAVA_MEM", "-Xmx512m")
@property
def java_stack(self):
if hasattr(self.args, "stack"):
return self.args.stack
else:
return os.environ.get("JAVA_STACK", "-Xss1024k")
@property
def java_opts(self):
return [self.java_mem, self.java_stack]
@property
def java_profile_agent(self):
return os.path.join(self.jython_home, "javalib", "profile.jar")
def set_encoding(self):
if "JAVA_ENCODING" not in os.environ and self.uname == "darwin" and "file.encoding" not in self.args.properties:
self.args.properties["file.encoding"] = "UTF-8"
def convert(self, arg):
if sys.stdout.encoding:
return arg.encode(sys.stdout.encoding)
else:
return arg
def make_classpath(self, jars):
return self.classpath_delimiter.join(jars)
def convert_path(self, arg):
if self.uname == "cygwin":
if not arg.startswith("/cygdrive/"):
new_path = self.convert(arg).replace("/", "\\")
else:
new_path = subprocess.check_output(["cygpath", "-pw", self.convert(arg)]).strip()
return new_path
else:
return self.convert(arg)
@property
def command(self):
self.set_encoding()
args = [self.java_command]
args.extend(self.java_opts)
args.extend(self.args.java)
classpath = self.java_classpath
jython_jars = self.jython_jars
if self.args.boot:
args.append("-Xbootclasspath/a:%s" % self.convert_path(self.make_classpath(jython_jars)))
else:
classpath = self.make_classpath(jython_jars) + self.classpath_delimiter + classpath
args.extend(["-classpath", self.convert_path(classpath)])
if "python.home" not in self.args.properties:
args.append("-Dpython.home=%s" % self.convert_path(self.jython_home))
if "python.executable" not in self.args.properties:
args.append("-Dpython.executable=%s" % self.convert_path(self.executable))
if "python.launcher.uname" not in self.args.properties:
args.append("-Dpython.launcher.uname=%s" % self.uname)
# Determines whether running on a tty for the benefit of
# running on Cygwin. This step is needed because the Mintty
# terminal emulator doesn't behave like a standard Microsoft
# Windows tty, and so JNR Posix doesn't detect it properly.
if "python.launcher.tty" not in self.args.properties:
args.append("-Dpython.launcher.tty=%s" % str(os.isatty(sys.stdin.fileno())).lower())
if self.uname == "cygwin" and "python.console" not in self.args.properties:
args.append("-Dpython.console=org.python.core.PlainConsole")
if self.args.profile:
args.append("-XX:-UseSplitVerifier")
args.append("-javaagent:%s" % self.convert_path(self.java_profile_agent))
for k, v in self.args.properties.iteritems():
args.append("-D%s=%s" % (self.convert(k), self.convert(v)))
args.append("org.python.util.jython")
if self.args.help:
args.append("--help")
args.extend(self.jython_args)
return args
def bad_option(msg):
print >> sys.stderr, """
{msg}
usage: jython [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `jython -h' for more information.
""".format(msg=msg)
sys.exit(2)
def print_help():
print >> sys.stderr, """
Jython launcher-specific options:
-Dname=value : pass name=value property to Java VM (e.g. -Dpython.path=/a/b/c)
-Jarg : pass argument through to Java VM (e.g. -J-Xmx512m)
--boot : speeds up launch performance by putting Jython jars on the boot classpath
--help : this help message
--jdb : run under JDB java debugger
--print : print the Java command with args for launching Jython instead of executing it
--profile: run with the Java Interactive Profiler (http://jiprof.sf.net)
-- : pass remaining arguments through to Jython
Jython launcher environment variables:
JAVA_MEM : Java memory (sets via -Xmx)
JAVA_OPTS : options to pass directly to Java
JAVA_STACK : Java stack size (sets via -Xss)
JAVA_HOME : Java installation directory
JYTHON_HOME: Jython installation directory
JYTHON_OPTS: default command line arguments
"""
def support_java_opts(args):
it = iter(args)
while it:
arg = next(it)
if arg.startswith("-D"):
yield arg
elif arg in ("-classpath", "-cp"):
yield "-J" + arg
try:
yield next(it)
except StopIteration:
bad_option("Argument expected for -classpath option in JAVA_OPTS")
else:
yield "-J" + arg
# copied from subprocess module in Jython; see
# http://bugs.python.org/issue1724822 where it is discussed to include
# in Python 3.x for shlex:
def cmdline2list(cmdline):
"""Build an argv list from a Microsoft shell style cmdline str
The reverse of list2cmdline that follows the same MS C runtime
rules.
"""
whitespace = ' \t'
# count of preceding '\'
bs_count = 0
in_quotes = False
arg = []
argv = []
for ch in cmdline:
if ch in whitespace and not in_quotes:
if arg:
# finalize arg and reset
argv.append(''.join(arg))
arg = []
bs_count = 0
elif ch == '\\':
arg.append(ch)
bs_count += 1
elif ch == '"':
if not bs_count % 2:
# Even number of '\' followed by a '"'. Place one
# '\' for every pair and treat '"' as a delimiter
if bs_count:
del arg[-(bs_count / 2):]
in_quotes = not in_quotes
else:
# Odd number of '\' followed by a '"'. Place one '\'
# for every pair and treat '"' as an escape sequence
# by the remaining '\'
del arg[-(bs_count / 2 + 1):]
arg.append(ch)
bs_count = 0
else:
# regular char
arg.append(ch)
bs_count = 0
# A single trailing '"' delimiter yields an empty arg
if arg or in_quotes:
argv.append(''.join(arg))
return argv
def decode_args(sys_args):
args = [sys_args[0]]
def get_env_opts(envvar):
opts = os.environ.get(envvar, "")
if is_windows:
return cmdline2list(opts)
else:
return shlex.split(opts)
java_opts = get_env_opts("JAVA_OPTS")
jython_opts = get_env_opts("JYTHON_OPTS")
args.extend(support_java_opts(java_opts))
args.extend(sys_args[1:])
if sys.stdout.encoding:
if sys.stdout.encoding.lower() == "cp65001":
sys.exit("""Jython does not support code page 65001 (CP_UTF8).
Please try another code page by setting it with the chcp command.""")
args = [arg.decode(sys.stdout.encoding) for arg in args]
jython_opts = [arg.decode(sys.stdout.encoding) for arg in jython_opts]
return args, jython_opts
def main(sys_args):
sys_args, jython_opts = decode_args(sys_args)
args, jython_args = parse_launcher_args(sys_args)
jython_command = JythonCommand(args, jython_opts + jython_args)
command = jython_command.command
if args.profile and not args.help:
try:
os.unlink("profile.txt")
except OSError:
pass
if args.print_requested and not args.help:
if jython_command.uname == "windows":
print subprocess.list2cmdline(jython_command.command)
else:
print " ".join(pipes.quote(arg) for arg in jython_command.command)
else:
if not (is_windows or not hasattr(os, "execvp") or args.help or jython_command.uname == "cygwin"):
# Replace this process with the java process.
#
# NB such replacements actually do not work under Windows,
# but if tried, they also fail very badly by hanging.
# So don't even try!
os.execvp(command[0], command[1:])
else:
result = 1
try:
result = subprocess.call(command)
if args.help:
print_help()
except KeyboardInterrupt:
pass
sys.exit(result)
if __name__ == "__main__":
main(sys.argv)