1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
# (X)Emacs: -*- mode: python; coding: latin-1; -*-
# TAB-Completion for Jython with JLine console.
# JLineCompleter.py,v 1.5 2007/09/28 09:13:10 martin Exp
# Jython + JLine + Tab-Completion Micro-Howto:
#
# JLine is a 99% pure Java console library similar to GNU Readline but
# with an incompatible API. Jython 2.2 already contains some support
# for JLine. For basic line editing and a command history it suffices
# to set python.console=org.python.util.JLineConsole either in the
# Jython registry or in the ~/.jython file. Obviously the JLine
# jarfile must be in your classpath.
#
# Unfortunately Jython does not support tab-completion for JLine yet.
# It can be enabled by importing this file - however this needs
# patches. To summarize prerequisites:
#
# 1. You need a patch to JLine that adds the
# ConsoleRunner.getReader() method. On FreeBSD build jline with
# option WITH_JLINEPATCH enabled.
#
# 2. You must wrap the entry point to Jython with a
# jline.ConsoleRunner instance. You do this by editing
# /usr/local/bin/jython and inserting an extra argument
# "jline.ConsoleRunner" right before the "org.python.util.jython"
# argument.
#
# 3. While there don't forget to add
# /usr/local/share/java/classes/jline.jar to the classpath.
#
# 4. You must set python.console="" in the ~/.jython file. You
# don't want Jython to create another console instance running
# behind the wrapper console.
#
# 5. Finally you have to import this module. You may want to do a
# "import user" instead and code the "import JLineCompleter"
# inside ~/.pythonrc.py instead.
#
# If that is too much hassle - just wait for my upcoming
# devel/libreadline-java port!
"""Word completion for JLine
The completer completes keywords, built-ins and globals in a
selectable namespace (which defaults to __main__); when completing
NAME.NAME..., it evaluates (!) the expression up to the last dot and
completes its attributes.
It's very cool to do "import sys" type "sys.", hit the
completion key (twice), and see the list of names defined by the
sys module!
Notes:
- Exceptions raised by the completer function are *ignored* (and
generally cause the completion to fail). This is a feature -- since
readline sets the tty device in raw (or cbreak) mode, printing a
traceback wouldn't work well without some complicated hoopla to save,
reset and restore the tty state.
- The evaluation of the NAME.NAME... form may cause arbitrary
application defined code to be executed if an object with a
__getattr__ hook is found. Since it is the responsibility of the
application (or the user) to enable this feature, I consider this an
acceptable risk. More complicated expressions (e.g. function calls or
indexing operations) are *not* evaluated.
This module is a slightly hacked version of the CPython 2.5 module
rlcompleter. It is therefore under the PSF (Python Software
Foundation) license.
"""
__all__ = ["JLineCompleter"]
__license__ = "PSF"
try:
import jline
except ImportError:
raise ImportError("Make sure you have the jline.jar in classpath!")
if not jline.__file__:
jline.__file__ = "jline.jar" # Keep the site module from throwing.
import __builtin__
import keyword
import re
# @sig public class JythonCompleter extends java.lang.Object implements
# jline.Completor, org.python.core.PyProxy, org.python.core.ClassDictInit
class JLineCompleter(jline.Completor):
def __init__(self, namespace = None):
"""Create a new completer for the command line.
Completer([namespace]) -> completer instance.
If unspecified, the default namespace where completions are performed
is __main__ (technically, __main__.__dict__). Namespaces should be
given as dictionaries.
Completer instances should be used as the completion mechanism of
JLine via the jline.ConsoleRunner.completors system property.
"""
if namespace and not isinstance(namespace, dict):
raise TypeError,'namespace must be a dictionary'
# Don't bind to namespace quite yet, but flag whether the user wants a
# specific namespace or to use __main__.__dict__. This will allow us
# to bind to __main__.__dict__ at completion time, not now.
if namespace is None:
self.use_main_ns = 1
else:
self.use_main_ns = 0
self.namespace = namespace
# @sig int complete(String buffer, int cursor, List candidates)
def complete(self, buffer, cursor, candidates):
"""Return the list of possible completions for 'buffer'."""
if self.use_main_ns:
import __main__
self.namespace = __main__.__dict__
# Determine the text to be expanded:
text = buffer[:cursor]
start = 0
for i in xrange(cursor - 1, -1, -1):
ch = text[i]
if not (ch.isalnum() or ch == '.' or ch == '_'):
start = i + 1
break
text = text[start:]
try:
if "." in text:
self.matches = self.attr_matches(text)
else:
self.matches = self.global_matches(text)
for m in self.matches:
candidates.add(m)
if self.matches:
return start
else:
return -1
except (AttributeError, IndexError, NameError):
return -1
def global_matches(self, text):
"""Compute matches when text is a simple name.
Return a list of all keywords, built-in functions and names currently
defined in self.namespace that match.
"""
matches = []
n = len(text)
for list in [keyword.kwlist,
__builtin__.__dict__,
self.namespace]:
for word in list:
if word[:n] == text and word != "__builtins__":
matches.append(word)
return matches
def attr_matches(self, text):
"""Compute matches when text contains a dot.
Assuming the text is of the form NAME.NAME....[NAME], and is
evaluatable in self.namespace, it will be evaluated and its attributes
(as revealed by dir()) are used as possible completions. (For class
instances, class members are also considered.)
WARNING: this can still invoke arbitrary C code, if an object
with a __getattr__ hook is evaluated.
"""
m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
if not m:
return
expr, attr = m.group(1, 3)
object = eval(expr, self.namespace)
words = dir(object)
if hasattr(object,'__class__'):
words.append('__class__')
words = words + get_class_members(object.__class__)
matches = []
n = len(attr)
for word in words:
if word[:n] == attr and word != "__builtins__":
matches.append("%s.%s" % (expr, word))
return matches
def get_class_members(klass):
ret = dir(klass)
if hasattr(klass,'__bases__'):
for base in klass.__bases__:
ret = ret + get_class_members(base)
return ret
try:
reader = jline.ConsoleRunner.getReader()
if reader:
reader.addCompletor(JLineCompleter())
else:
raise RuntimeError("jline.ConsoleRunner not active")
except AttributeError:
# XXX This message is FreeBSD specific!
raise NotImplementedError("Incompatible JLine version! Set WITH_JLINEPATCH=1 and rebuild the devel/jline port!")
if __name__ == '__main__':
print "Sorry, no unittests yet!"
#EOF#
|
