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(duplicates=config.hist_duplicates)
self.s_hist = []
self.history = []
self.evaluating = False
self.completer = Autocomplete(self.interp.locals, config)
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
self.interact = Interaction(self.config)
self.ps1 = '>>> '
self.ps2 = '... '
# previous pastebin content to prevent duplicate pastes, filled on call
# to repl.pastebin
self.prev_pastebin_content = ''
self.prev_pastebin_url = ''
# Necessary to fix mercurial.ui.ui expecting sys.stderr to have this
# attribute
self.closed = False
pythonhist = os.path.expanduser(self.config.hist_file)
if os.path.exists(pythonhist):
self.rl_history.load(pythonhist,
getpreferredencoding() or 'ascii')
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(duplicates=config.hist_duplicates)
self.s_hist = []
self.history = []
self.evaluating = False
self.completer = Autocomplete(self.interp.locals, config)
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
self.interact = Interaction(self.config)
self.ps1 = '>>> '
self.ps2 = '... '
# previous pastebin content to prevent duplicate pastes, filled on call
# to repl.pastebin
self.prev_pastebin_content = ''
self.prev_pastebin_url = ''
# Necessary to fix mercurial.ui.ui expecting sys.stderr to have this
# attribute
self.closed = False
pythonhist = os.path.expanduser(self.config.hist_file)
if os.path.exists(pythonhist):
self.rl_history.load(pythonhist, getpreferredencoding() or "ascii")
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 current_string(self, concatenate=False):
"""If the line ends in a string get it, otherwise return ''"""
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] = ''
stack[-1][0] = ''
elif value == ':' and stack[-1][2] == 'lambda':
stack.pop()
else:
stack[-1][0] = ''
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]
stack[-1][0] = ''
elif token is Token.Keyword and value == 'lambda':
stack.append(['', 0, value])
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 get_source_of_current_name(self):
"""Return the source code of the object which is bound to the
current name in the current input line. Return `None` if the
source cannot be found."""
try:
obj = self.current_func
if obj is None:
line = self.current_line()
if inspection.is_eval_safe_name(line):
obj = self.get_object(line)
source = inspect.getsource(obj)
except (AttributeError, IOError, NameError, TypeError):
return None
else:
return source
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:
try:
self.docstring = pydoc.getdoc(self.current_func)
except IndexError:
self.docstring = None
else:
# pydoc.getdoc() returns an empty string if no
# docstring was found
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 (self.config.complete_magic_methods and self.buffer
and self.buffer[0].startswith("class ")
and self.current_line().lstrip().startswith("def ")):
matches.extend(name for name in self.config.magic_methods
if name.startswith(cw))
if not e and self.argspec:
matches.extend(name + '=' for name in self.argspec[1][0]
if isinstance(name, str) and 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 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(self.ps1):
yield line[len(self.ps1):]
elif line.startswith(self.ps2):
yield line[len(self.ps2):]
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.interact.file_prompt('Save to file (Esc to cancel): ')
if not fn:
self.interact.notify("Save cancelled.")
return
except ValueError:
self.interact.notify("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.interact.notify("Disk write error for file '%s'." % (fn, ))
else:
self.interact.notify('Saved to %s' % (fn, ))
def pastebin(self, s=None):
"""Upload to a pastebin and display the URL in the status bar."""
if s is None:
s = self.getstdout()
if (self.config.pastebin_confirm
and not self.interact.confirm(_("Pastebin buffer? (y/N) "))):
self.interact.notify(_("Pastebin aborted"))
return
return self.do_pastebin(s)
def do_pastebin(self, s):
"""Actually perform the upload."""
if s == self.prev_pastebin_content:
self.interact.notify(
_('Duplicate pastebin. Previous URL: %s') %
(self.prev_pastebin_url, ))
return self.prev_pastebin_url
if self.config.pastebin_helper:
return self.do_pastebin_helper(s)
else:
return self.do_pastebin_xmlrpc(s)
def do_pastebin_xmlrpc(self, s):
"""Upload to pastebin via XML-RPC."""
try:
pasteservice = ServerProxy(self.config.pastebin_url)
except IOError as e:
self.interact.notify(
_("Pastebin error for URL '%s': %s") %
(self.config.pastebin_url, str(e)))
return
self.interact.notify(_('Posting data to pastebin...'))
try:
paste_id = pasteservice.pastes.newPaste(
'pycon', s, '', '', '', self.config.pastebin_private)
except (SocketError, XMLRPCError) as e:
self.interact.notify(_('Upload failed: %s') % (str(e), ))
return
self.prev_pastebin_content = s
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.prev_pastebin_url = paste_url
self.interact.notify(_('Pastebin URL: %s') % (paste_url, ), 10)
return paste_url
def do_pastebin_helper(self, s):
"""Call out to helper program for pastebin upload."""
self.interact.notify(_('Posting data to pastebin...'))
try:
helper = subprocess.Popen('',
executable=self.config.pastebin_helper,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
helper.stdin.write(s.encode(getpreferredencoding()))
output = helper.communicate()[0].decode(getpreferredencoding())
paste_url = output.split()[0]
except OSError as e:
if e.errno == errno.ENOENT:
self.interact.notify(
_('Upload failed: '
'Helper program not found.'))
else:
self.interact.notify(
_('Upload failed: '
'Helper program could not be run.'))
return
if helper.returncode != 0:
self.interact.notify(
_('Upload failed: '
'Helper program returned non-zero exit '
'status %s.' % (helper.returncode, )))
return
if not paste_url:
self.interact.notify(
_('Upload failed: '
'No output from helper program.'))
return
else:
parsed_url = urlparse(paste_url)
if (not parsed_url.scheme
or any(unicodedata.category(c) == 'Cc'
for c in paste_url)):
self.interact.notify(
_("Upload failed: "
"Failed to recognize the helper "
"program's output as an URL."))
return
self.prev_pastebin_content = s
self.interact.notify(_('Pastebin URL: %s') % (paste_url, ), 10)
return paste_url
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:
if self.config.hist_length:
histfilename = os.path.expanduser(self.config.hist_file)
oldhistory = self.rl_history.entries
self.rl_history.entries = []
if os.path.exists(histfilename):
self.rl_history.load(histfilename, getpreferredencoding())
self.rl_history.append(s)
try:
self.rl_history.save(histfilename, getpreferredencoding(),
self.config.hist_length)
except EnvironmentError as err:
self.interact.notify(
"Error occured while writing to file %s (%s) " %
(histfilename, err.strerror))
self.rl_history.entries = oldhistory
self.rl_history.append(s)
else:
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 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(list(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 iter(parens.values()):
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.
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(duplicates=config.hist_duplicates)
self.s_hist = []
self.history = []
self.evaluating = False
self.completer = Autocomplete(self.interp.locals, config)
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
self.interact = Interaction(self.config)
self.ps1 = '>>> '
self.ps2 = '... '
# previous pastebin content to prevent duplicate pastes, filled on call
# to repl.pastebin
self.prev_pastebin_content = ''
self.prev_pastebin_url = ''
# Necessary to fix mercurial.ui.ui expecting sys.stderr to have this
# attribute
self.closed = False
pythonhist = os.path.expanduser(self.config.hist_file)
if os.path.exists(pythonhist):
self.rl_history.load(pythonhist,
getpreferredencoding() or 'ascii')
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 current_string(self, concatenate=False):
"""If the line ends in a string get it, otherwise return ''."""
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] = ''
stack[-1][0] = ''
elif value == ':' and stack[-1][2] == 'lambda':
stack.pop()
else:
stack[-1][0] = ''
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]
stack[-1][0] = ''
elif token is Token.Keyword and value == 'lambda':
stack.append(['', 0, value])
else:
stack[-1][0] = ''
while stack[-1][2] in '[{':
stack.pop()
arg_number = stack.pop()[1]
func = stack.pop()[0]
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 get_source_of_current_name(self):
"""Return the source code of the object which is bound to the current
name in the current input line.
Return `None` if the source cannot be found.
"""
try:
obj = self.current_func
if obj is None:
line = self.current_line()
if inspection.is_eval_safe_name(line):
obj = self.get_object(line)
source = inspect.getsource(obj)
except (AttributeError, IOError, NameError, TypeError):
return None
else:
return source
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:
try:
self.docstring = pydoc.getdoc(self.current_func)
except IndexError:
self.docstring = None
else:
# pydoc.getdoc() returns an empty string if no
# docstring was found
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 (self.config.complete_magic_methods and self.buffer and
self.buffer[0].startswith('class ') and
self.current_line().lstrip().startswith('def ')):
matches.extend(name for name in self.config.magic_methods
if name.startswith(cw))
if not e and self.argspec:
matches.extend(name + '=' for name in self.argspec[1][0]
if isinstance(name, basestring) and 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 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(self.ps1):
yield line[len(self.ps1):]
elif line.startswith(self.ps2):
yield line[len(self.ps2):]
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.interact.file_prompt('Save to file (Esc to cancel): ')
if not fn:
self.interact.notify('Save cancelled.')
return
except ValueError:
self.interact.notify('Save cancelled.')
return
if fn.startswith('~'):
fn = os.path.expanduser(fn)
if not fn.endswith('.py') and self.config.save_append_py:
fn = fn + '.py'
mode = 'w'
if os.path.exists(fn):
mode = self.interact.file_prompt('%s already exists. Do you want '
'to (c)ancel, (o)verwrite or '
'(a)ppend? ' % (fn, ))
if mode in ('o', 'overwrite'):
mode = 'w'
elif mode in ('a', 'append'):
mode = 'a'
else:
self.interact.notify('Save cancelled.')
return
s = self.formatforfile(self.getstdout())
try:
f = open(fn, mode)
f.write(s)
f.close()
except IOError:
self.interact.notify("Disk write error for file '%s'." % (fn, ))
else:
self.interact.notify('Saved to %s.' % (fn, ))
def pastebin(self, s=None):
"""Upload to a pastebin and display the URL in the status bar."""
if s is None:
s = self.getstdout()
if (self.config.pastebin_confirm and
not self.interact.confirm(_('Pastebin buffer? (y/N) '))):
self.interact.notify(_('Pastebin aborted'))
return
return self.do_pastebin(s)
def do_pastebin(self, s):
"""Actually perform the upload."""
if s == self.prev_pastebin_content:
self.interact.notify(_('Duplicate pastebin. Previous URL: %s') %
(self.prev_pastebin_url, ))
return self.prev_pastebin_url
if self.config.pastebin_helper:
return self.do_pastebin_helper(s)
else:
return self.do_pastebin_xmlrpc(s)
def do_pastebin_xmlrpc(self, s):
"""Upload to pastebin via XML-RPC."""
try:
pasteservice = ServerProxy(self.config.pastebin_url)
except IOError as e:
self.interact.notify(_("Pastebin error for URL '%s': %s") %
(self.config.pastebin_url, str(e)))
return
self.interact.notify(_('Posting data to pastebin...'))
try:
paste_id = pasteservice.pastes.newPaste('pycon', s, '', '', '',
self.config.pastebin_private)
except (SocketError, XMLRPCError) as e:
self.interact.notify(_('Upload failed: %s') % (str(e), ))
return
self.prev_pastebin_content = s
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.prev_pastebin_url = paste_url
self.interact.notify(_('Pastebin URL: %s') % (paste_url, ), 10)
return paste_url
def do_pastebin_helper(self, s):
"""Call out to helper program for pastebin upload."""
self.interact.notify(_('Posting data to pastebin...'))
try:
helper = subprocess.Popen('',
executable=self.config.pastebin_helper,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
helper.stdin.write(s.encode(getpreferredencoding()))
output = helper.communicate()[0].decode(getpreferredencoding())
paste_url = output.split()[0]
except OSError as e:
if e.errno == errno.ENOENT:
self.interact.notify(_('Upload failed: '
'Helper program not found.'))
else:
self.interact.notify(_('Upload failed: '
'Helper program could not be run.'))
return
if helper.returncode != 0:
self.interact.notify(_('Upload failed: '
'Helper program returned non-zero exit '
'status %s.' % (helper.returncode, )))
return
if not paste_url:
self.interact.notify(_('Upload failed: '
'No output from helper program.'))
return
else:
parsed_url = urlparse(paste_url)
if (not parsed_url.scheme
or any(unicodedata.category(c) == 'Cc' for c in paste_url)):
self.interact.notify(_('Upload failed: '
'Failed to recognize the helper '
"program's output as an URL."))
return
self.prev_pastebin_content = s
self.interact.notify(_('Pastebin URL: %s') % (paste_url, ), 10)
return paste_url
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:
if self.config.hist_length:
histfilename = os.path.expanduser(self.config.hist_file)
oldhistory = self.rl_history.entries
self.rl_history.entries = []
if os.path.exists(histfilename):
self.rl_history.load(histfilename, getpreferredencoding())
self.rl_history.append(s)
try:
self.rl_history.save(
histfilename,
getpreferredencoding(),
self.config.hist_length)
except EnvironmentError as err:
self.interact.notify(
'Error occurred while writing to file %s (%s) ' %
(histfilename, err.strerror))
self.rl_history.entries = oldhistory
self.rl_history.append(s)
else:
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 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.values():
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.
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(duplicates=config.hist_duplicates)
self.s_hist = []
self.history = []
self.evaluating = False
self.completer = Autocomplete(self.interp.locals, config)
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
self.interact = Interaction(self.config)
self.ps1 = '>>> '
self.ps2 = '... '
# previous pastebin content to prevent duplicate pastes, filled on call
# to repl.pastebin
self.prev_pastebin_content = ''
self.prev_pastebin_url = ''
# Necessary to fix mercurial.ui.ui expecting sys.stderr to have this
# attribute
self.closed = False
pythonhist = os.path.expanduser(self.config.hist_file)
if os.path.exists(pythonhist):
self.rl_history.load(pythonhist,
getpreferredencoding() or "ascii")
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 current_string(self, concatenate=False):
"""If the line ends in a string get it, otherwise return ''"""
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] = ''
stack[-1][0] = ''
elif value == ':' and stack[-1][2] == 'lambda':
stack.pop()
else:
stack[-1][0] = ''
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]
stack[-1][0] = ''
elif token is Token.Keyword and value == 'lambda':
stack.append(['', 0, value])
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 get_source_of_current_name(self):
"""Return the source code of the object which is bound to the
current name in the current input line. Return `None` if the
source cannot be found."""
try:
obj = self.current_func
if obj is None:
line = self.current_line()
if inspection.is_eval_safe_name(line):
obj = self.get_object(line)
source = inspect.getsource(obj)
except (AttributeError, IOError, NameError, TypeError):
return None
else:
return source
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:
try:
self.docstring = pydoc.getdoc(self.current_func)
except IndexError:
self.docstring = None
else:
# pydoc.getdoc() returns an empty string if no
# docstring was found
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 (self.config.complete_magic_methods and self.buffer and
self.buffer[0].startswith("class ") and
self.current_line().lstrip().startswith("def ")):
matches.extend(name for name in self.config.magic_methods
if name.startswith(cw))
if not e and self.argspec:
matches.extend(name + '=' for name in self.argspec[1][0]
if isinstance(name, basestring) and 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 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(self.ps1):
yield line[len(self.ps1):]
elif line.startswith(self.ps2):
yield line[len(self.ps2):]
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.interact.file_prompt('Save to file (Esc to cancel): ')
if not fn:
self.interact.notify("Save cancelled.")
return
except ValueError:
self.interact.notify("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.interact.notify("Disk write error for file '%s'." % (fn, ))
else:
self.interact.notify('Saved to %s' % (fn, ))
def pastebin(self, s=None):
"""Upload to a pastebin and display the URL in the status bar."""
if s is None:
s = self.getstdout()
if (self.config.pastebin_confirm and
not self.interact.confirm(_("Pastebin buffer? (y/N) "))):
self.interact.notify(_("Pastebin aborted"))
return
return self.do_pastebin(s)
def do_pastebin(self, s):
"""Actually perform the upload."""
if s == self.prev_pastebin_content:
self.interact.notify(_('Duplicate pastebin. Previous URL: %s') %
(self.prev_pastebin_url, ))
return self.prev_pastebin_url
if self.config.pastebin_helper:
return self.do_pastebin_helper(s)
else:
return self.do_pastebin_xmlrpc(s)
def do_pastebin_xmlrpc(self, s):
"""Upload to pastebin via XML-RPC."""
try:
pasteservice = ServerProxy(self.config.pastebin_url)
except IOError, e:
self.interact.notify(_("Pastebin error for URL '%s': %s") %
(self.config.pastebin_url, str(e)))
return
self.interact.notify(_('Posting data to pastebin...'))
try:
paste_id = pasteservice.pastes.newPaste('pycon', s, '', '', '',
self.config.pastebin_private)
except (SocketError, XMLRPCError), e:
self.interact.notify(_('Upload failed: %s') % (str(e), ) )
return
