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# The MIT License
#
# Copyright (c) 2009-2010 the bpython authors.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# G*RLLCRA RHTNSAHTNSOG()*(@****
from __future__ import with_statement
import code
import codecs
import inspect
import os
import pydoc
import re
import rlcompleter
import sys
import textwrap
import traceback
from glob import glob
from itertools import takewhile
from locale import getpreferredencoding
from string import Template
from urllib import quote as urlquote
from xmlrpclib import ServerProxy, Error as XMLRPCError
from pygments.lexers import PythonLexer
from pygments.token import Token
from bpython import importcompletion, inspection
from bpython.formatter import Parenthesis
# Needed for special handling of __abstractmethods__
# abc only exists since 2.6, so check both that it exists and that it's
# the one we're expecting
try:
import abc
abc.ABCMeta
has_abc = True
except (ImportError, AttributeError):
has_abc = False
py3 = sys.version_info[0] == 3
class Interpreter(code.InteractiveInterpreter):
def __init__(self, locals=None, encoding=sys.getdefaultencoding()):
"""The syntaxerror callback can be set at any time and will be called
on a caught syntax error. The purpose for this in bpython is so that
the repl can be instantiated after the interpreter (which it
necessarily must be with the current factoring) and then an exception
callback can be added to the Interpeter instance afterwards - more
specifically, this is so that autoindentation does not occur after a
traceback."""
self.encoding = encoding
self.syntaxerror_callback = None
# Unfortunately code.InteractiveInterpreter is a classic class, so no super()
code.InteractiveInterpreter.__init__(self, locals)
if not py3:
def runsource(self, source, filename='<input>', symbol='single',
encode=True):
if encode:
source = '# coding: %s\n%s' % (self.encoding,
source.encode(self.encoding))
return code.InteractiveInterpreter.runsource(self, source,
filename, symbol)
def showsyntaxerror(self, filename=None):
"""Override the regular handler, the code's copied and pasted from
code.py, as per showtraceback, but with the syntaxerror callback called
and the text in a pretty colour."""
if self.syntaxerror_callback is not None:
self.syntaxerror_callback()
type, value, sys.last_traceback = sys.exc_info()
sys.last_type = type
sys.last_value = value
if filename and type is SyntaxError:
# Work hard to stuff the correct filename in the exception
try:
msg, (dummy_filename, lineno, offset, line) = value.args
except:
# Not the format we expect; leave it alone
pass
else:
# Stuff in the right filename and right lineno
if not py3:
lineno -= 1
value = SyntaxError(msg, (filename, lineno, offset, line))
sys.last_value = value
list = traceback.format_exception_only(type, value)
self.writetb(list)
def showtraceback(self):
"""This needs to override the default traceback thing
so it can put it into a pretty colour and maybe other
stuff, I don't know"""
try:
t, v, tb = sys.exc_info()
sys.last_type = t
sys.last_value = v
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
# Set the right lineno (encoding header adds an extra line)
if not py3:
for i, (filename, lineno, module, something) in enumerate(tblist):
if filename == '<input>':
tblist[i] = (filename, lineno - 1, module, something)
l = traceback.format_list(tblist)
if l:
l.insert(0, "Traceback (most recent call last):\n")
l[len(l):] = traceback.format_exception_only(t, v)
finally:
tblist = tb = None
self.writetb(l)
def writetb(self, lines):
"""This outputs the traceback and should be overridden for anything
fancy."""
for line in lines:
self.write(line)
class History(object):
def __init__(self, entries=None):
if entries is None:
self.entries = ['']
else:
self.entries = list(entries)
self.index = 0
self.saved_line = ''
def append(self, line):
line = line.rstrip('\n')
if line:
self.entries.append(line)
def back(self):
if not self.is_at_end():
self.index += 1
return self.entries[-self.index]
def is_at_end(self):
return self.index >= len(self.entries)
def is_at_start(self):
return self.index == 0
def enter(self, line):
if self.index == 0:
self.saved_line = line
def forward(self):
if self.index > 1:
self.index -= 1
return self.entries[-self.index]
else:
self.index = 0
return self.saved_line
@classmethod
def from_filename(cls, filename):
history = cls()
history.load(filename)
return history
def load(self, filename, encoding):
with codecs.open(filename, 'r', encoding, 'ignore') as hfile:
for line in hfile:
self.append(line)
def reset(self):
self.index = 0
self.saved_line = ''
def save(self, filename, encoding, lines=0):
with codecs.open(filename, 'w', encoding, 'ignore') as hfile:
for line in self.entries[-lines:]:
hfile.write(line)
hfile.write('\n')
class MatchesIterator(object):
def __init__(self, current_word='', matches=[]):
self.current_word = current_word
self.matches = list(matches)
self.index = -1
def __nonzero__(self):
return self.index != -1
def __iter__(self):
return self
def current(self):
if self.index == -1:
raise ValueError('No current match.')
return self.matches[self.index]
def next(self):
self.index = (self.index + 1) % len(self.matches)
return self.matches[self.index]
def previous(self):
self.index = (self.index - 1) % len(self.matches)
return self.matches[self.index]
def update(self, current_word='', matches=[]):
if current_word != self.current_word:
self.current_word = current_word
self.matches = list(matches)
self.index = -1
class Repl(object):
"""Implements the necessary guff for a Python-repl-alike interface
The execution of the code entered and all that stuff was taken from the
Python code module, I had to copy it instead of inheriting it, I can't
remember why. The rest of the stuff is basically what makes it fancy.
It reads what you type, passes it to a lexer and highlighter which
returns a formatted string. This then gets passed to echo() which
parses that string and prints to the curses screen in appropriate
colours and/or bold attribute.
The Repl class also keeps two stacks of lines that the user has typed in:
One to be used for the undo feature. I am not happy with the way this
works. The only way I have been able to think of is to keep the code
that's been typed in in memory and re-evaluate it in its entirety for each
"undo" operation. Obviously this means some operations could be extremely
slow. I'm not even by any means certain that this truly represents a
genuine "undo" implementation, but it does seem to be generally pretty
effective.
If anyone has any suggestions for how this could be improved, I'd be happy
to hear them and implement it/accept a patch. I researched a bit into the
idea of keeping the entire Python state in memory, but this really seems
very difficult (I believe it may actually be impossible to work) and has
its own problems too.
The other stack is for keeping a history for pressing the up/down keys
to go back and forth between lines.
XXX Subclasses should implement echo, current_line, cw
"""
def __init__(self, interp, config):
"""Initialise the repl.
interp is a Python code.InteractiveInterpreter instance
config is a populated bpython.config.Struct.
"""
self.config = config
self.cut_buffer = ''
self.buffer = []
self.interp = interp
self.interp.syntaxerror_callback = self.clear_current_line
self.match = False
self.rl_history = History()
self.stdout_hist = ''
self.s_hist = []
self.history = []
self.evaluating = False
# Use the interpreter's namespace only for the readline stuff:
self.completer = rlcompleter.Completer(self.interp.locals)
self.completer.attr_matches = self.attr_matches
# Gna, Py 2.6's rlcompleter searches for __call__ inside the
# instance instead of the type, so we monkeypatch to prevent
# side-effects (__getattr__/__getattribute__)
self.completer._callable_postfix = self._callable_postfix
self.matches = []
self.matches_iter = MatchesIterator()
self.argspec = None
self.current_func = None
self.highlighted_paren = None
self.list_win_visible = False
self._C = {}
self.prev_block_finished = 0
pythonhist = os.path.expanduser(self.config.hist_file)
if os.path.exists(pythonhist):
self.rl_history.load(pythonhist, getpreferredencoding())
def startup(self):
"""
Execute PYTHONSTARTUP file if it exits. Call this after front
end-specific initialisation.
"""
filename = os.environ.get('PYTHONSTARTUP')
if filename and os.path.isfile(filename):
with open(filename, 'r') as f:
if py3:
self.interp.runsource(f.read(), filename, 'exec')
else:
self.interp.runsource(f.read(), filename, 'exec', encode=False)
def attr_matches(self, text):
"""Taken from rlcompleter.py and bent to my will."""
m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
if not m:
return []
expr, attr = m.group(1, 3)
if expr.isdigit():
# Special case: float literal, using attrs here will result in
# a SyntaxError
return []
obj = eval(expr, self.interp.locals)
with inspection.AttrCleaner(obj):
matches = self.attr_lookup(obj, expr, attr)
return matches
def attr_lookup(self, obj, expr, attr):
"""Second half of original attr_matches method factored out so it can
be wrapped in a safe try/finally block in case anything bad happens to
restore the original __getattribute__ method."""
words = dir(obj)
if hasattr(obj, '__class__'):
words.append('__class__')
words = words + rlcompleter.get_class_members(obj.__class__)
if has_abc and not isinstance(obj.__class__, abc.ABCMeta):
try:
words.remove('__abstractmethods__')
except ValueError:
pass
matches = []
n = len(attr)
for word in words:
if word[:n] == attr and word != "__builtins__":
matches.append("%s.%s" % (expr, word))
return matches
def _callable_postfix(self, value, word):
"""rlcompleter's _callable_postfix done right."""
with inspection.AttrCleaner(value):
if inspection.is_callable(value):
word += '('
return word
def current_string(self, concatenate=False):
"""Return the current string."""
tokens = self.tokenize(self.current_line())
string_tokens = list(takewhile(token_is_any_of([Token.String,
Token.Text]),
reversed(tokens)))
if not string_tokens:
return ''
opening = string_tokens.pop()[1]
string = list()
for (token, value) in reversed(string_tokens):
if token is Token.Text:
continue
elif opening is None:
opening = value
elif token is Token.String.Doc:
string.append(value[3:-3])
opening = None
elif value == opening:
opening = None
if not concatenate:
string = list()
else:
string.append(value)
if opening is None:
return ''
return ''.join(string)
def get_object(self, name):
attributes = name.split('.')
obj = eval(attributes.pop(0), self.interp.locals)
while attributes:
with inspection.AttrCleaner(obj):
obj = getattr(obj, attributes.pop(0))
return obj
def get_args(self):
"""Check if an unclosed parenthesis exists, then attempt to get the
argspec() for it. On success, update self.argspec and return True,
otherwise set self.argspec to None and return False"""
self.current_func = None
if not self.config.arg_spec:
return False
# Get the name of the current function and where we are in
# the arguments
stack = [['', 0, '']]
try:
for (token, value) in PythonLexer().get_tokens(
self.current_line()):
if token is Token.Punctuation:
if value in '([{':
stack.append(['', 0, value])
elif value in ')]}':
stack.pop()
elif value == ',':
try:
stack[-1][1] += 1
except TypeError:
stack[-1][1] = ''
elif (token is Token.Name or token in Token.Name.subtypes or
token is Token.Operator and value == '.'):
stack[-1][0] += value
elif token is Token.Operator and value == '=':
stack[-1][1] = stack[-1][0]
else:
stack[-1][0] = ''
while stack[-1][2] in '[{':
stack.pop()
_, arg_number, _ = stack.pop()
func, _, _ = stack.pop()
except IndexError:
return False
if not func:
return False
try:
f = self.get_object(func)
except (AttributeError, NameError, SyntaxError):
return False
if inspect.isclass(f):
try:
if f.__init__ is not object.__init__:
f = f.__init__
except AttributeError:
return None
self.current_func = f
self.argspec = inspection.getargspec(func, f)
if self.argspec:
self.argspec.append(arg_number)
return True
return False
def complete(self, tab=False):
"""Construct a full list of possible completions and construct and
display them in a window. Also check if there's an available argspec
(via the inspect module) and bang that on top of the completions too.
The return value is whether the list_win is visible or not."""
self.docstring = None
if not self.get_args():
self.argspec = None
elif self.current_func is not None:
self.docstring = pydoc.getdoc(self.current_func)
if not self.docstring:
self.docstring = None
cw = self.cw()
cs = self.current_string()
if not cw:
self.matches = []
self.matches_iter.update()
if not (cw or cs):
return bool(self.argspec)
if cs and tab:
# Filename completion
self.matches = list()
username = cs.split(os.path.sep, 1)[0]
user_dir = os.path.expanduser(username)
for filename in glob(os.path.expanduser(cs + '*')):
if os.path.isdir(filename):
filename += os.path.sep
if cs.startswith('~'):
filename = username + filename[len(user_dir):]
self.matches.append(filename)
self.matches_iter.update(cs, self.matches)
return bool(self.matches)
elif cs:
# Do not provide suggestions inside strings, as one cannot tab
# them so they would be really confusing.
self.matches_iter.update()
return False
# Check for import completion
e = False
matches = importcompletion.complete(self.current_line(), cw)
if matches is not None and not matches:
self.matches = []
self.matches_iter.update()
return False
if matches is None:
# Nope, no import, continue with normal completion
try:
self.completer.complete(cw, 0)
except Exception:
# This sucks, but it's either that or list all the exceptions that could
# possibly be raised here, so if anyone wants to do that, feel free to send me
# a patch. XXX: Make sure you raise here if you're debugging the completion
# stuff !
e = True
else:
matches = self.completer.matches
if not e and self.argspec:
matches.extend(name + '=' for name in self.argspec[1][0]
if name.startswith(cw))
if py3:
matches.extend(name + '=' for name in self.argspec[1][4]
if name.startswith(cw))
# unless the first character is a _ filter out all attributes starting with a _
if not e and not cw.split('.')[-1].startswith('_'):
matches = [match for match in matches
if not match.split('.')[-1].startswith('_')]
if e or not matches:
self.matches = []
self.matches_iter.update()
if not self.argspec:
return False
else:
# remove duplicates
self.matches = sorted(set(matches))
if len(self.matches) == 1 and not self.config.auto_display_list:
self.list_win_visible = True
self.tab()
return False
self.matches_iter.update(cw, self.matches)
return True
def format_docstring(self, docstring, width, height):
"""Take a string and try to format it into a sane list of strings to be
put into the suggestion box."""
lines = docstring.split('\n')
out = []
i = 0
for line in lines:
i += 1
if not line.strip():
out.append('\n')
for block in textwrap.wrap(line, width):
out.append(' ' + block + '\n')
if i >= height:
return out
i += 1
# Drop the last newline
out[-1] = out[-1].rstrip()
return out
def next_indentation(self):
"""Return the indentation of the next line based on the current
input buffer."""
if self.buffer:
indentation = next_indentation(self.buffer[-1],
self.config.tab_length)
if indentation and self.config.dedent_after > 0:
line_is_empty = lambda line: not line.strip()
empty_lines = takewhile(line_is_empty, reversed(self.buffer))
if sum(1 for _ in empty_lines) >= self.config.dedent_after:
indentation -= 1
else:
indentation = 0
return indentation
def getstdout(self):
"""This method returns the 'spoofed' stdout buffer, for writing to a
file or sending to a pastebin or whatever."""
return self.stdout_hist + '\n'
def formatforfile(self, s):
"""Format the stdout buffer to something suitable for writing to disk,
i.e. without >>> and ... at input lines and with "# OUT: " prepended to
output lines."""
def process():
for line in s.split('\n'):
if line.startswith('>>>') or line.startswith('...'):
yield line[4:]
elif line.rstrip():
yield "# OUT: %s" % (line,)
return "\n".join(process())
def write2file(self):
"""Prompt for a filename and write the current contents of the stdout
buffer to disk."""
try:
fn = self.statusbar.prompt('Save to file (Esc to cancel): ')
except ValueError:
self.statusbar.message("Save cancelled.")
return
if fn.startswith('~'):
fn = os.path.expanduser(fn)
s = self.formatforfile(self.getstdout())
try:
f = open(fn, 'w')
f.write(s)
f.close()
except IOError:
self.statusbar.message("Disk write error for file '%s'." % (fn, ))
else:
self.statusbar.message('Saved to %s' % (fn, ))
def pastebin(self):
"""Upload to a pastebin and display the URL in the status bar."""
if (self.config.pastebin_confirm and
not self.statusbar.prompt("Pastebin buffer? (y/N) "
).lower().startswith('y'
)):
self.statusbar.message("Pastebin aborted")
return
pasteservice = ServerProxy(self.config.pastebin_url)
s = self.getstdout()
self.statusbar.message('Posting data to pastebin...')
try:
paste_id = pasteservice.pastes.newPaste('pycon', s)
except XMLRPCError, e:
self.statusbar.message('Upload failed: %s' % (str(e), ) )
return
paste_url_template = Template(self.config.pastebin_show_url)
paste_id = urlquote(paste_id)
paste_url = paste_url_template.safe_substitute(paste_id=paste_id)
self.statusbar.message('Pastebin URL: %s' % (paste_url, ), 10)
def push(self, s, insert_into_history=True):
"""Push a line of code onto the buffer so it can process it all
at once when a code block ends"""
s = s.rstrip('\n')
self.buffer.append(s)
if insert_into_history:
self.rl_history.append(s)
more = self.interp.runsource('\n'.join(self.buffer))
if not more:
self.buffer = []
return more
def undo(self, n=1):
"""Go back in the undo history n steps and call reeavluate()
Note that in the program this is called "Rewind" because I
want it to be clear that this is by no means a true undo
implementation, it is merely a convenience bonus."""
if not self.history:
return None
if len(self.history) < n:
n = len(self.history)
entries = list(self.rl_history.entries)
self.history = self.history[:-n]
self.reevaluate()
self.rl_history.entries = entries
def reevaluate(self):
"""Clear the buffer, redraw the screen and re-evaluate the history"""
self.evaluating = True
self.stdout_hist = ''
self.f_string = ''
self.buffer = []
self.scr.erase()
self.s_hist = []
# Set cursor position to -1 to prevent paren matching
self.cpos = -1
self.prompt(False)
self.iy, self.ix = self.scr.getyx()
for line in self.history:
if py3:
self.stdout_hist += line + '\n'
else:
self.stdout_hist += line.encode(getpreferredencoding()) + '\n'
self.print_line(line)
self.s_hist[-1] += self.f_string
# I decided it was easier to just do this manually
# than to make the print_line and history stuff more flexible.
self.scr.addstr('\n')
more = self.push(line)
self.prompt(more)
self.iy, self.ix = self.scr.getyx()
self.cpos = 0
indent = next_indentation(self.s, self.config.tab_length)
self.s = ''
self.scr.refresh()
if self.buffer:
for _ in xrange(indent):
self.tab()
self.evaluating = False
#map(self.push, self.history)
#^-- That's how simple this method was at first :(
def write(self, s):
"""For overriding stdout defaults"""
if '\x04' in s:
for block in s.split('\x04'):
self.write(block)
return
if s.rstrip() and '\x03' in s:
t = s.split('\x03')[1]
else:
t = s
if not py3 and isinstance(t, unicode):
t = t.encode(getpreferredencoding())
if not self.stdout_hist:
self.stdout_hist = t
else:
self.stdout_hist += t
self.echo(s)
self.s_hist.append(s.rstrip())
def flush(self):
"""Olivier Grisel brought it to my attention that the logging
module tries to call this method, since it makes assumptions
about stdout that may not necessarily be true. The docs for
sys.stdout say:
"stdout and stderr needn't be built-in file objects: any
object is acceptable as long as it has a write() method
that takes a string argument."
So I consider this to be a bug in logging, and this is a hack
to fix it, unfortunately. I'm sure it's not the only module
to do it."""
def close(self):
"""See the flush() method docstring."""
def tokenize(self, s, newline=False):
"""Tokenize a line of code."""
source = '\n'.join(self.buffer + [s])
cursor = len(source) - self.cpos
if self.cpos:
cursor += 1
stack = list()
all_tokens = list(PythonLexer().get_tokens(source))
# Unfortunately, Pygments adds a trailing newline and strings with
# no size, so strip them
while not all_tokens[-1][1]:
all_tokens.pop()
all_tokens[-1] = (all_tokens[-1][0], all_tokens[-1][1].rstrip('\n'))
line = pos = 0
parens = dict(zip('{([', '})]'))
line_tokens = list()
saved_tokens = list()
search_for_paren = True
for (token, value) in split_lines(all_tokens):
pos += len(value)
if token is Token.Text and value == '\n':
line += 1
# Remove trailing newline
line_tokens = list()
saved_tokens = list()
continue
line_tokens.append((token, value))
saved_tokens.append((token, value))
if not search_for_paren:
continue
under_cursor = (pos == cursor)
if token is Token.Punctuation:
if value in parens:
if under_cursor:
line_tokens[-1] = (Parenthesis.UnderCursor, value)
# Push marker on the stack
stack.append((Parenthesis, value))
else:
stack.append((line, len(line_tokens) - 1,
line_tokens, value))
elif value in parens.itervalues():
saved_stack = list(stack)
try:
while True:
opening = stack.pop()
if parens[opening[-1]] == value:
break
except IndexError:
# SyntaxError.. more closed parentheses than
# opened or a wrong closing paren
opening = None
if not saved_stack:
search_for_paren = False
else:
stack = saved_stack
if opening and opening[0] is Parenthesis:
# Marker found
line_tokens[-1] = (Parenthesis, value)
search_for_paren = False
elif opening and under_cursor and not newline:
if self.cpos:
line_tokens[-1] = (Parenthesis.UnderCursor, value)
else:
# The cursor is at the end of line and next to
# the paren, so it doesn't reverse the paren.
# Therefore, we insert the Parenthesis token
# here instead of the Parenthesis.UnderCursor
# token.
line_tokens[-1] = (Parenthesis, value)
(lineno, i, tokens, opening) = opening
if lineno == len(self.buffer):
self.highlighted_paren = (lineno, saved_tokens)
line_tokens[i] = (Parenthesis, opening)
else:
self.highlighted_paren = (lineno, list(tokens))
# We need to redraw a line
tokens[i] = (Parenthesis, opening)
self.reprint_line(lineno, tokens)
search_for_paren = False
elif under_cursor:
search_for_paren = False
if line != len(self.buffer):
return list()
return line_tokens
def clear_current_line(self):
"""This is used as the exception callback for the Interpreter instance.
It prevents autoindentation from occuring after a traceback."""
def next_indentation(line, tab_length):
"""Given a code line, return the indentation of the next line."""
line = line.expandtabs(tab_length)
indentation = (len(line) - len(line.lstrip(' '))) // tab_length
if line.rstrip().endswith(':'):
indentation += 1
return indentation
def next_token_inside_string(s, inside_string):
"""Given a code string s and an initial state inside_string, return
whether the next token will be inside a string or not."""
for token, value in PythonLexer().get_tokens(s):
if token is Token.String:
value = value.lstrip('bBrRuU')
if value in ['"""', "'''", '"', "'"]:
if not inside_string:
inside_string = value
elif value == inside_string:
inside_string = False
return inside_string
def split_lines(tokens):
for (token, value) in tokens:
if not value:
continue
while value:
head, newline, value = value.partition('\n')
yield (token, head)
if newline:
yield (Token.Text, newline)
def token_is(token_type):
"""Return a callable object that returns whether a token is of the
given type `token_type`."""
def token_is_type(token):
"""Return whether a token is of a certain type or not."""
token = token[0]
while token is not token_type and token.parent:
token = token.parent
return token is token_type
return token_is_type
def token_is_any_of(token_types):
"""Return a callable object that returns whether a token is any of the
given types `token_types`."""
is_token_types = map(token_is, token_types)
def token_is_any_of(token):
return any(check(token) for check in is_token_types)
return token_is_any_of