File: //snap/google-cloud-cli/394/lib/third_party/prompt_toolkit/buffer.py
"""
Data structures for the Buffer.
It holds the text, cursor position, history, etc...
"""
from __future__ import unicode_literals
from .auto_suggest import AutoSuggest
from .clipboard import ClipboardData
from .completion import Completer, Completion, CompleteEvent
from .document import Document
from .enums import IncrementalSearchDirection
from .filters import to_simple_filter
from .history import History, InMemoryHistory
from .search_state import SearchState
from .selection import SelectionType, SelectionState, PasteMode
from .utils import Event
from .cache import FastDictCache
from .validation import ValidationError
from six.moves import range
import os
import re
import six
import subprocess
import tempfile
__all__ = (
'EditReadOnlyBuffer',
'AcceptAction',
'Buffer',
'indent',
'unindent',
'reshape_text',
)
class EditReadOnlyBuffer(Exception):
" Attempt editing of read-only :class:`.Buffer`. "
class AcceptAction(object):
"""
What to do when the input is accepted by the user.
(When Enter was pressed in the command line.)
:param handler: (optional) A callable which takes a
:class:`~prompt_toolkit.interface.CommandLineInterface` and
:class:`~prompt_toolkit.document.Document`. It is called when the user
accepts input.
"""
def __init__(self, handler=None):
assert handler is None or callable(handler)
self.handler = handler
@classmethod
def run_in_terminal(cls, handler, render_cli_done=False):
"""
Create an :class:`.AcceptAction` that runs the given handler in the
terminal.
:param render_cli_done: When True, render the interface in the 'Done'
state first, then execute the function. If False, erase the
interface instead.
"""
def _handler(cli, buffer):
cli.run_in_terminal(lambda: handler(cli, buffer), render_cli_done=render_cli_done)
return AcceptAction(handler=_handler)
@property
def is_returnable(self):
"""
True when there is something handling accept.
"""
return bool(self.handler)
def validate_and_handle(self, cli, buffer):
"""
Validate buffer and handle the accept action.
"""
if buffer.validate():
if self.handler:
self.handler(cli, buffer)
buffer.append_to_history()
def _return_document_handler(cli, buffer):
# Set return value.
cli.set_return_value(buffer.document)
# Make sure that if we run this UI again, that we reset this buffer, next
# time.
def reset_this_buffer():
buffer.reset()
cli.pre_run_callables.append(reset_this_buffer)
AcceptAction.RETURN_DOCUMENT = AcceptAction(_return_document_handler)
AcceptAction.IGNORE = AcceptAction(handler=None)
class ValidationState(object):
" The validation state of a buffer. This is set after the validation. "
VALID = 'VALID'
INVALID = 'INVALID'
UNKNOWN = 'UNKNOWN'
class CompletionState(object):
"""
Immutable class that contains a completion state.
"""
def __init__(self, original_document, current_completions=None, complete_index=None):
#: Document as it was when the completion started.
self.original_document = original_document
#: List of all the current Completion instances which are possible at
#: this point.
self.current_completions = current_completions or []
#: Position in the `current_completions` array.
#: This can be `None` to indicate "no completion", the original text.
self.complete_index = complete_index # Position in the `_completions` array.
def __repr__(self):
return '%s(%r, <%r> completions, index=%r)' % (
self.__class__.__name__,
self.original_document, len(self.current_completions), self.complete_index)
def go_to_index(self, index):
"""
Create a new :class:`.CompletionState` object with the new index.
"""
return CompletionState(self.original_document, self.current_completions, complete_index=index)
def new_text_and_position(self):
"""
Return (new_text, new_cursor_position) for this completion.
"""
if self.complete_index is None:
return self.original_document.text, self.original_document.cursor_position
else:
original_text_before_cursor = self.original_document.text_before_cursor
original_text_after_cursor = self.original_document.text_after_cursor
c = self.current_completions[self.complete_index]
if c.start_position == 0:
before = original_text_before_cursor
else:
before = original_text_before_cursor[:c.start_position]
new_text = before + c.text + original_text_after_cursor
new_cursor_position = len(before) + len(c.text)
return new_text, new_cursor_position
@property
def current_completion(self):
"""
Return the current completion, or return `None` when no completion is
selected.
"""
if self.complete_index is not None:
return self.current_completions[self.complete_index]
_QUOTED_WORDS_RE = re.compile(r"""(\s+|".*?"|'.*?')""")
class YankNthArgState(object):
"""
For yank-last-arg/yank-nth-arg: Keep track of where we are in the history.
"""
def __init__(self, history_position=0, n=-1, previous_inserted_word=''):
self.history_position = history_position
self.previous_inserted_word = previous_inserted_word
self.n = n
def __repr__(self):
return '%s(history_position=%r, n=%r, previous_inserted_word=%r)' % (
self.__class__.__name__, self.history_position, self.n,
self.previous_inserted_word)
class Buffer(object):
"""
The core data structure that holds the text and cursor position of the
current input line and implements all text manupulations on top of it. It
also implements the history, undo stack and the completion state.
:param completer: :class:`~prompt_toolkit.completion.Completer` instance.
:param history: :class:`~prompt_toolkit.history.History` instance.
:param tempfile_suffix: Suffix to be appended to the tempfile for the 'open
in editor' function.
Events:
:param on_text_changed: When the buffer text changes. (Callable on None.)
:param on_text_insert: When new text is inserted. (Callable on None.)
:param on_cursor_position_changed: When the cursor moves. (Callable on None.)
Filters:
:param is_multiline: :class:`~prompt_toolkit.filters.SimpleFilter` to
indicate whether we should consider this buffer a multiline input. If
so, key bindings can decide to insert newlines when pressing [Enter].
(Instead of accepting the input.)
:param complete_while_typing: :class:`~prompt_toolkit.filters.SimpleFilter`
instance. Decide whether or not to do asynchronous autocompleting while
typing.
:param enable_history_search: :class:`~prompt_toolkit.filters.SimpleFilter`
to indicate when up-arrow partial string matching is enabled. It is
adviced to not enable this at the same time as `complete_while_typing`,
because when there is an autocompletion found, the up arrows usually
browse through the completions, rather than through the history.
:param read_only: :class:`~prompt_toolkit.filters.SimpleFilter`. When True,
changes will not be allowed.
"""
def __init__(self, completer=None, auto_suggest=None, history=None,
validator=None, tempfile_suffix='',
is_multiline=False, complete_while_typing=False,
enable_history_search=False, initial_document=None,
accept_action=AcceptAction.IGNORE, read_only=False,
on_text_changed=None, on_text_insert=None, on_cursor_position_changed=None):
# Accept both filters and booleans as input.
enable_history_search = to_simple_filter(enable_history_search)
is_multiline = to_simple_filter(is_multiline)
complete_while_typing = to_simple_filter(complete_while_typing)
read_only = to_simple_filter(read_only)
# Validate input.
assert completer is None or isinstance(completer, Completer)
assert auto_suggest is None or isinstance(auto_suggest, AutoSuggest)
assert history is None or isinstance(history, History)
assert on_text_changed is None or callable(on_text_changed)
assert on_text_insert is None or callable(on_text_insert)
assert on_cursor_position_changed is None or callable(on_cursor_position_changed)
self.completer = completer
self.auto_suggest = auto_suggest
self.validator = validator
self.tempfile_suffix = tempfile_suffix
self.accept_action = accept_action
# Filters. (Usually, used by the key bindings to drive the buffer.)
self.is_multiline = is_multiline
self.complete_while_typing = complete_while_typing
self.enable_history_search = enable_history_search
self.read_only = read_only
# Text width. (For wrapping, used by the Vi 'gq' operator.)
self.text_width = 0
#: The command buffer history.
# Note that we shouldn't use a lazy 'or' here. bool(history) could be
# False when empty.
self.history = InMemoryHistory() if history is None else history
self.__cursor_position = 0
# Events
self.on_text_changed = Event(self, on_text_changed)
self.on_text_insert = Event(self, on_text_insert)
self.on_cursor_position_changed = Event(self, on_cursor_position_changed)
# Document cache. (Avoid creating new Document instances.)
self._document_cache = FastDictCache(Document, size=10)
self.reset(initial_document=initial_document)
def reset(self, initial_document=None, append_to_history=False):
"""
:param append_to_history: Append current input to history first.
"""
assert initial_document is None or isinstance(initial_document, Document)
if append_to_history:
self.append_to_history()
initial_document = initial_document or Document()
self.__cursor_position = initial_document.cursor_position
# `ValidationError` instance. (Will be set when the input is wrong.)
self.validation_error = None
self.validation_state = ValidationState.UNKNOWN
# State of the selection.
self.selection_state = None
# Multiple cursor mode. (When we press 'I' or 'A' in visual-block mode,
# we can insert text on multiple lines at once. This is implemented by
# using multiple cursors.)
self.multiple_cursor_positions = []
# When doing consecutive up/down movements, prefer to stay at this column.
self.preferred_column = None
# State of complete browser
self.complete_state = None # For interactive completion through Ctrl-N/Ctrl-P.
# State of Emacs yank-nth-arg completion.
self.yank_nth_arg_state = None # for yank-nth-arg.
# Remember the document that we had *right before* the last paste
# operation. This is used for rotating through the kill ring.
self.document_before_paste = None
# Current suggestion.
self.suggestion = None
# The history search text. (Used for filtering the history when we
# browse through it.)
self.history_search_text = None
# Undo/redo stacks
self._undo_stack = [] # Stack of (text, cursor_position)
self._redo_stack = []
#: The working lines. Similar to history, except that this can be
#: modified. The user can press arrow_up and edit previous entries.
#: Ctrl-C should reset this, and copy the whole history back in here.
#: Enter should process the current command and append to the real
#: history.
self._working_lines = self.history.strings[:]
self._working_lines.append(initial_document.text)
self.__working_index = len(self._working_lines) - 1
# <getters/setters>
def _set_text(self, value):
""" set text at current working_index. Return whether it changed. """
working_index = self.working_index
working_lines = self._working_lines
original_value = working_lines[working_index]
working_lines[working_index] = value
# Return True when this text has been changed.
if len(value) != len(original_value):
# For Python 2, it seems that when two strings have a different
# length and one is a prefix of the other, Python still scans
# character by character to see whether the strings are different.
# (Some benchmarking showed significant differences for big
# documents. >100,000 of lines.)
return True
elif value != original_value:
return True
return False
def _set_cursor_position(self, value):
""" Set cursor position. Return whether it changed. """
original_position = self.__cursor_position
self.__cursor_position = max(0, value)
return value != original_position
@property
def text(self):
return self._working_lines[self.working_index]
@text.setter
def text(self, value):
"""
Setting text. (When doing this, make sure that the cursor_position is
valid for this text. text/cursor_position should be consistent at any time,
otherwise set a Document instead.)
"""
assert isinstance(value, six.text_type), 'Got %r' % value
assert self.cursor_position <= len(value)
# Don't allow editing of read-only buffers.
if self.read_only():
raise EditReadOnlyBuffer()
changed = self._set_text(value)
if changed:
self._text_changed()
# Reset history search text.
self.history_search_text = None
@property
def cursor_position(self):
return self.__cursor_position
@cursor_position.setter
def cursor_position(self, value):
"""
Setting cursor position.
"""
assert isinstance(value, int)
assert value <= len(self.text)
changed = self._set_cursor_position(value)
if changed:
self._cursor_position_changed()
@property
def working_index(self):
return self.__working_index
@working_index.setter
def working_index(self, value):
if self.__working_index != value:
self.__working_index = value
self._text_changed()
def _text_changed(self):
# Remove any validation errors and complete state.
self.validation_error = None
self.validation_state = ValidationState.UNKNOWN
self.complete_state = None
self.yank_nth_arg_state = None
self.document_before_paste = None
self.selection_state = None
self.suggestion = None
self.preferred_column = None
# fire 'on_text_changed' event.
self.on_text_changed.fire()
def _cursor_position_changed(self):
# Remove any validation errors and complete state.
self.validation_error = None
self.validation_state = ValidationState.UNKNOWN
self.complete_state = None
self.yank_nth_arg_state = None
self.document_before_paste = None
# Unset preferred_column. (Will be set after the cursor movement, if
# required.)
self.preferred_column = None
# Note that the cursor position can change if we have a selection the
# new position of the cursor determines the end of the selection.
# fire 'on_cursor_position_changed' event.
self.on_cursor_position_changed.fire()
@property
def document(self):
"""
Return :class:`~prompt_toolkit.document.Document` instance from the
current text, cursor position and selection state.
"""
return self._document_cache[
self.text, self.cursor_position, self.selection_state]
@document.setter
def document(self, value):
"""
Set :class:`~prompt_toolkit.document.Document` instance.
This will set both the text and cursor position at the same time, but
atomically. (Change events will be triggered only after both have been set.)
"""
self.set_document(value)
def set_document(self, value, bypass_readonly=False):
"""
Set :class:`~prompt_toolkit.document.Document` instance. Like the
``document`` property, but accept an ``bypass_readonly`` argument.
:param bypass_readonly: When True, don't raise an
:class:`.EditReadOnlyBuffer` exception, even
when the buffer is read-only.
"""
assert isinstance(value, Document)
# Don't allow editing of read-only buffers.
if not bypass_readonly and self.read_only():
raise EditReadOnlyBuffer()
# Set text and cursor position first.
text_changed = self._set_text(value.text)
cursor_position_changed = self._set_cursor_position(value.cursor_position)
# Now handle change events. (We do this when text/cursor position is
# both set and consistent.)
if text_changed:
self._text_changed()
if cursor_position_changed:
self._cursor_position_changed()
# End of <getters/setters>
def save_to_undo_stack(self, clear_redo_stack=True):
"""
Safe current state (input text and cursor position), so that we can
restore it by calling undo.
"""
# Safe if the text is different from the text at the top of the stack
# is different. If the text is the same, just update the cursor position.
if self._undo_stack and self._undo_stack[-1][0] == self.text:
self._undo_stack[-1] = (self._undo_stack[-1][0], self.cursor_position)
else:
self._undo_stack.append((self.text, self.cursor_position))
# Saving anything to the undo stack, clears the redo stack.
if clear_redo_stack:
self._redo_stack = []
def transform_lines(self, line_index_iterator, transform_callback):
"""
Transforms the text on a range of lines.
When the iterator yield an index not in the range of lines that the
document contains, it skips them silently.
To uppercase some lines::
new_text = transform_lines(range(5,10), lambda text: text.upper())
:param line_index_iterator: Iterator of line numbers (int)
:param transform_callback: callable that takes the original text of a
line, and return the new text for this line.
:returns: The new text.
"""
# Split lines
lines = self.text.split('\n')
# Apply transformation
for index in line_index_iterator:
try:
lines[index] = transform_callback(lines[index])
except IndexError:
pass
return '\n'.join(lines)
def transform_current_line(self, transform_callback):
"""
Apply the given transformation function to the current line.
:param transform_callback: callable that takes a string and return a new string.
"""
document = self.document
a = document.cursor_position + document.get_start_of_line_position()
b = document.cursor_position + document.get_end_of_line_position()
self.text = (
document.text[:a] +
transform_callback(document.text[a:b]) +
document.text[b:])
def transform_region(self, from_, to, transform_callback):
"""
Transform a part of the input string.
:param from_: (int) start position.
:param to: (int) end position.
:param transform_callback: Callable which accepts a string and returns
the transformed string.
"""
assert from_ < to
self.text = ''.join([
self.text[:from_] +
transform_callback(self.text[from_:to]) +
self.text[to:]
])
def cursor_left(self, count=1):
self.cursor_position += self.document.get_cursor_left_position(count=count)
def cursor_right(self, count=1):
self.cursor_position += self.document.get_cursor_right_position(count=count)
def cursor_up(self, count=1):
""" (for multiline edit). Move cursor to the previous line. """
original_column = self.preferred_column or self.document.cursor_position_col
self.cursor_position += self.document.get_cursor_up_position(
count=count, preferred_column=original_column)
# Remember the original column for the next up/down movement.
self.preferred_column = original_column
def cursor_down(self, count=1):
""" (for multiline edit). Move cursor to the next line. """
original_column = self.preferred_column or self.document.cursor_position_col
self.cursor_position += self.document.get_cursor_down_position(
count=count, preferred_column=original_column)
# Remember the original column for the next up/down movement.
self.preferred_column = original_column
def auto_up(self, count=1, go_to_start_of_line_if_history_changes=False):
"""
If we're not on the first line (of a multiline input) go a line up,
otherwise go back in history. (If nothing is selected.)
"""
if self.complete_state:
self.complete_previous(count=count)
elif self.document.cursor_position_row > 0:
self.cursor_up(count=count)
elif not self.selection_state:
self.history_backward(count=count)
# Go to the start of the line?
if go_to_start_of_line_if_history_changes:
self.cursor_position += self.document.get_start_of_line_position()
def auto_down(self, count=1, go_to_start_of_line_if_history_changes=False):
"""
If we're not on the last line (of a multiline input) go a line down,
otherwise go forward in history. (If nothing is selected.)
"""
if self.complete_state:
self.complete_next(count=count)
elif self.document.cursor_position_row < self.document.line_count - 1:
self.cursor_down(count=count)
elif not self.selection_state:
self.history_forward(count=count)
# Go to the start of the line?
if go_to_start_of_line_if_history_changes:
self.cursor_position += self.document.get_start_of_line_position()
def delete_before_cursor(self, count=1):
"""
Delete specified number of characters before cursor and return the
deleted text.
"""
assert count >= 0
deleted = ''
if self.cursor_position > 0:
deleted = self.text[self.cursor_position - count:self.cursor_position]
new_text = self.text[:self.cursor_position - count] + self.text[self.cursor_position:]
new_cursor_position = self.cursor_position - len(deleted)
# Set new Document atomically.
self.document = Document(new_text, new_cursor_position)
return deleted
def delete(self, count=1):
"""
Delete specified number of characters and Return the deleted text.
"""
if self.cursor_position < len(self.text):
deleted = self.document.text_after_cursor[:count]
self.text = self.text[:self.cursor_position] + \
self.text[self.cursor_position + len(deleted):]
return deleted
else:
return ''
def join_next_line(self, separator=' '):
"""
Join the next line to the current one by deleting the line ending after
the current line.
"""
if not self.document.on_last_line:
self.cursor_position += self.document.get_end_of_line_position()
self.delete()
# Remove spaces.
self.text = (self.document.text_before_cursor + separator +
self.document.text_after_cursor.lstrip(' '))
def join_selected_lines(self, separator=' '):
"""
Join the selected lines.
"""
assert self.selection_state
# Get lines.
from_, to = sorted([self.cursor_position, self.selection_state.original_cursor_position])
before = self.text[:from_]
lines = self.text[from_:to].splitlines()
after = self.text[to:]
# Replace leading spaces with just one space.
lines = [l.lstrip(' ') + separator for l in lines]
# Set new document.
self.document = Document(text=before + ''.join(lines) + after,
cursor_position=len(before + ''.join(lines[:-1])) - 1)
def swap_characters_before_cursor(self):
"""
Swap the last two characters before the cursor.
"""
pos = self.cursor_position
if pos >= 2:
a = self.text[pos - 2]
b = self.text[pos - 1]
self.text = self.text[:pos-2] + b + a + self.text[pos:]
def go_to_history(self, index):
"""
Go to this item in the history.
"""
if index < len(self._working_lines):
self.working_index = index
self.cursor_position = len(self.text)
def complete_next(self, count=1, disable_wrap_around=False):
"""
Browse to the next completions.
(Does nothing if there are no completion.)
"""
if self.complete_state:
completions_count = len(self.complete_state.current_completions)
if self.complete_state.complete_index is None:
index = 0
elif self.complete_state.complete_index == completions_count - 1:
index = None
if disable_wrap_around:
return
else:
index = min(completions_count-1, self.complete_state.complete_index + count)
self.go_to_completion(index)
def complete_previous(self, count=1, disable_wrap_around=False):
"""
Browse to the previous completions.
(Does nothing if there are no completion.)
"""
if self.complete_state:
if self.complete_state.complete_index == 0:
index = None
if disable_wrap_around:
return
elif self.complete_state.complete_index is None:
index = len(self.complete_state.current_completions) - 1
else:
index = max(0, self.complete_state.complete_index - count)
self.go_to_completion(index)
def cancel_completion(self):
"""
Cancel completion, go back to the original text.
"""
if self.complete_state:
self.go_to_completion(None)
self.complete_state = None
def set_completions(self, completions, go_to_first=True, go_to_last=False):
"""
Start completions. (Generate list of completions and initialize.)
"""
assert not (go_to_first and go_to_last)
# Generate list of all completions.
if completions is None:
if self.completer:
completions = list(self.completer.get_completions(
self.document,
CompleteEvent(completion_requested=True)
))
else:
completions = []
# Set `complete_state`.
if completions:
self.complete_state = CompletionState(
original_document=self.document,
current_completions=completions)
if go_to_first:
self.go_to_completion(0)
elif go_to_last:
self.go_to_completion(len(completions) - 1)
else:
self.go_to_completion(None)
else:
self.complete_state = None
def start_history_lines_completion(self):
"""
Start a completion based on all the other lines in the document and the
history.
"""
found_completions = set()
completions = []
# For every line of the whole history, find matches with the current line.
current_line = self.document.current_line_before_cursor.lstrip()
for i, string in enumerate(self._working_lines):
for j, l in enumerate(string.split('\n')):
l = l.strip()
if l and l.startswith(current_line):
# When a new line has been found.
if l not in found_completions:
found_completions.add(l)
# Create completion.
if i == self.working_index:
display_meta = "Current, line %s" % (j+1)
else:
display_meta = "History %s, line %s" % (i+1, j+1)
completions.append(Completion(
l,
start_position=-len(current_line),
display_meta=display_meta))
self.set_completions(completions=completions[::-1])
def go_to_completion(self, index):
"""
Select a completion from the list of current completions.
"""
assert index is None or isinstance(index, int)
assert self.complete_state
# Set new completion
state = self.complete_state.go_to_index(index)
# Set text/cursor position
new_text, new_cursor_position = state.new_text_and_position()
self.document = Document(new_text, new_cursor_position)
# (changing text/cursor position will unset complete_state.)
self.complete_state = state
def apply_completion(self, completion):
"""
Insert a given completion.
"""
assert isinstance(completion, Completion)
# If there was already a completion active, cancel that one.
if self.complete_state:
self.go_to_completion(None)
self.complete_state = None
# Insert text from the given completion.
self.delete_before_cursor(-completion.start_position)
self.insert_text(completion.text)
def _set_history_search(self):
""" Set `history_search_text`. """
if self.enable_history_search():
if self.history_search_text is None:
self.history_search_text = self.text
else:
self.history_search_text = None
def _history_matches(self, i):
"""
True when the current entry matches the history search.
(when we don't have history search, it's also True.)
"""
return (self.history_search_text is None or
self._working_lines[i].startswith(self.history_search_text))
def history_forward(self, count=1):
"""
Move forwards through the history.
:param count: Amount of items to move forward.
"""
self._set_history_search()
# Go forward in history.
found_something = False
for i in range(self.working_index + 1, len(self._working_lines)):
if self._history_matches(i):
self.working_index = i
count -= 1
found_something = True
if count == 0:
break
# If we found an entry, move cursor to the end of the first line.
if found_something:
self.cursor_position = 0
self.cursor_position += self.document.get_end_of_line_position()
def history_backward(self, count=1):
"""
Move backwards through history.
"""
self._set_history_search()
# Go back in history.
found_something = False
for i in range(self.working_index - 1, -1, -1):
if self._history_matches(i):
self.working_index = i
count -= 1
found_something = True
if count == 0:
break
# If we move to another entry, move cursor to the end of the line.
if found_something:
self.cursor_position = len(self.text)
def yank_nth_arg(self, n=None, _yank_last_arg=False):
"""
Pick nth word from previous history entry (depending on current
`yank_nth_arg_state`) and insert it at current position. Rotate through
history if called repeatedly. If no `n` has been given, take the first
argument. (The second word.)
:param n: (None or int), The index of the word from the previous line
to take.
"""
assert n is None or isinstance(n, int)
if not len(self.history):
return
# Make sure we have a `YankNthArgState`.
if self.yank_nth_arg_state is None:
state = YankNthArgState(n=-1 if _yank_last_arg else 1)
else:
state = self.yank_nth_arg_state
if n is not None:
state.n = n
# Get new history position.
new_pos = state.history_position - 1
if -new_pos > len(self.history):
new_pos = -1
# Take argument from line.
line = self.history[new_pos]
words = [w.strip() for w in _QUOTED_WORDS_RE.split(line)]
words = [w for w in words if w]
try:
word = words[state.n]
except IndexError:
word = ''
# Insert new argument.
if state.previous_inserted_word:
self.delete_before_cursor(len(state.previous_inserted_word))
self.insert_text(word)
# Save state again for next completion. (Note that the 'insert'
# operation from above clears `self.yank_nth_arg_state`.)
state.previous_inserted_word = word
state.history_position = new_pos
self.yank_nth_arg_state = state
def yank_last_arg(self, n=None):
"""
Like `yank_nth_arg`, but if no argument has been given, yank the last
word by default.
"""
self.yank_nth_arg(n=n, _yank_last_arg=True)
def start_selection(self, selection_type=SelectionType.CHARACTERS):
"""
Take the current cursor position as the start of this selection.
"""
self.selection_state = SelectionState(self.cursor_position, selection_type)
def copy_selection(self, _cut=False):
"""
Copy selected text and return :class:`.ClipboardData` instance.
"""
new_document, clipboard_data = self.document.cut_selection()
if _cut:
self.document = new_document
self.selection_state = None
return clipboard_data
def cut_selection(self):
"""
Delete selected text and return :class:`.ClipboardData` instance.
"""
return self.copy_selection(_cut=True)
def paste_clipboard_data(self, data, paste_mode=PasteMode.EMACS, count=1):
"""
Insert the data from the clipboard.
"""
assert isinstance(data, ClipboardData)
assert paste_mode in (PasteMode.VI_BEFORE, PasteMode.VI_AFTER, PasteMode.EMACS)
original_document = self.document
self.document = self.document.paste_clipboard_data(data, paste_mode=paste_mode, count=count)
# Remember original document. This assignment should come at the end,
# because assigning to 'document' will erase it.
self.document_before_paste = original_document
def newline(self, copy_margin=True):
"""
Insert a line ending at the current position.
"""
if copy_margin:
self.insert_text('\n' + self.document.leading_whitespace_in_current_line)
else:
self.insert_text('\n')
def insert_line_above(self, copy_margin=True):
"""
Insert a new line above the current one.
"""
if copy_margin:
insert = self.document.leading_whitespace_in_current_line + '\n'
else:
insert = '\n'
self.cursor_position += self.document.get_start_of_line_position()
self.insert_text(insert)
self.cursor_position -= 1
def insert_line_below(self, copy_margin=True):
"""
Insert a new line below the current one.
"""
if copy_margin:
insert = '\n' + self.document.leading_whitespace_in_current_line
else:
insert = '\n'
self.cursor_position += self.document.get_end_of_line_position()
self.insert_text(insert)
def insert_text(self, data, overwrite=False, move_cursor=True, fire_event=True):
"""
Insert characters at cursor position.
:param fire_event: Fire `on_text_insert` event. This is mainly used to
trigger autocompletion while typing.
"""
# Original text & cursor position.
otext = self.text
ocpos = self.cursor_position
# In insert/text mode.
if overwrite:
# Don't overwrite the newline itself. Just before the line ending,
# it should act like insert mode.
overwritten_text = otext[ocpos:ocpos + len(data)]
if '\n' in overwritten_text:
overwritten_text = overwritten_text[:overwritten_text.find('\n')]
self.text = otext[:ocpos] + data + otext[ocpos + len(overwritten_text):]
else:
self.text = otext[:ocpos] + data + otext[ocpos:]
if move_cursor:
self.cursor_position += len(data)
# Fire 'on_text_insert' event.
if fire_event:
self.on_text_insert.fire()
def undo(self):
# Pop from the undo-stack until we find a text that if different from
# the current text. (The current logic of `save_to_undo_stack` will
# cause that the top of the undo stack is usually the same as the
# current text, so in that case we have to pop twice.)
while self._undo_stack:
text, pos = self._undo_stack.pop()
if text != self.text:
# Push current text to redo stack.
self._redo_stack.append((self.text, self.cursor_position))
# Set new text/cursor_position.
self.document = Document(text, cursor_position=pos)
break
def redo(self):
if self._redo_stack:
# Copy current state on undo stack.
self.save_to_undo_stack(clear_redo_stack=False)
# Pop state from redo stack.
text, pos = self._redo_stack.pop()
self.document = Document(text, cursor_position=pos)
def validate(self):
"""
Returns `True` if valid.
"""
# Don't call the validator again, if it was already called for the
# current input.
if self.validation_state != ValidationState.UNKNOWN:
return self.validation_state == ValidationState.VALID
# Validate first. If not valid, set validation exception.
if self.validator:
try:
self.validator.validate(self.document)
except ValidationError as e:
# Set cursor position (don't allow invalid values.)
cursor_position = e.cursor_position
self.cursor_position = min(max(0, cursor_position), len(self.text))
self.validation_state = ValidationState.INVALID
self.validation_error = e
return False
self.validation_state = ValidationState.VALID
self.validation_error = None
return True
def append_to_history(self):
"""
Append the current input to the history.
(Only if valid input.)
"""
# Validate first. If not valid, set validation exception.
if not self.validate():
return
# Save at the tail of the history. (But don't if the last entry the
# history is already the same.)
if self.text and (not len(self.history) or self.history[-1] != self.text):
self.history.append(self.text)
def _search(self, search_state, include_current_position=False, count=1):
"""
Execute search. Return (working_index, cursor_position) tuple when this
search is applied. Returns `None` when this text cannot be found.
"""
assert isinstance(search_state, SearchState)
assert isinstance(count, int) and count > 0
text = search_state.text
direction = search_state.direction
ignore_case = search_state.ignore_case()
def search_once(working_index, document):
"""
Do search one time.
Return (working_index, document) or `None`
"""
if direction == IncrementalSearchDirection.FORWARD:
# Try find at the current input.
new_index = document.find(
text, include_current_position=include_current_position,
ignore_case=ignore_case)
if new_index is not None:
return (working_index,
Document(document.text, document.cursor_position + new_index))
else:
# No match, go forward in the history. (Include len+1 to wrap around.)
# (Here we should always include all cursor positions, because
# it's a different line.)
for i in range(working_index + 1, len(self._working_lines) + 1):
i %= len(self._working_lines)
document = Document(self._working_lines[i], 0)
new_index = document.find(text, include_current_position=True,
ignore_case=ignore_case)
if new_index is not None:
return (i, Document(document.text, new_index))
else:
# Try find at the current input.
new_index = document.find_backwards(
text, ignore_case=ignore_case)
if new_index is not None:
return (working_index,
Document(document.text, document.cursor_position + new_index))
else:
# No match, go back in the history. (Include -1 to wrap around.)
for i in range(working_index - 1, -2, -1):
i %= len(self._working_lines)
document = Document(self._working_lines[i], len(self._working_lines[i]))
new_index = document.find_backwards(
text, ignore_case=ignore_case)
if new_index is not None:
return (i, Document(document.text, len(document.text) + new_index))
# Do 'count' search iterations.
working_index = self.working_index
document = self.document
for _ in range(count):
result = search_once(working_index, document)
if result is None:
return # Nothing found.
else:
working_index, document = result
return (working_index, document.cursor_position)
def document_for_search(self, search_state):
"""
Return a :class:`~prompt_toolkit.document.Document` instance that has
the text/cursor position for this search, if we would apply it. This
will be used in the
:class:`~prompt_toolkit.layout.controls.BufferControl` to display
feedback while searching.
"""
search_result = self._search(search_state, include_current_position=True)
if search_result is None:
return self.document
else:
working_index, cursor_position = search_result
# Keep selection, when `working_index` was not changed.
if working_index == self.working_index:
selection = self.selection_state
else:
selection = None
return Document(self._working_lines[working_index],
cursor_position, selection=selection)
def get_search_position(self, search_state, include_current_position=True, count=1):
"""
Get the cursor position for this search.
(This operation won't change the `working_index`. It's won't go through
the history. Vi text objects can't span multiple items.)
"""
search_result = self._search(
search_state, include_current_position=include_current_position, count=count)
if search_result is None:
return self.cursor_position
else:
working_index, cursor_position = search_result
return cursor_position
def apply_search(self, search_state, include_current_position=True, count=1):
"""
Apply search. If something is found, set `working_index` and
`cursor_position`.
"""
search_result = self._search(
search_state, include_current_position=include_current_position, count=count)
if search_result is not None:
working_index, cursor_position = search_result
self.working_index = working_index
self.cursor_position = cursor_position
def exit_selection(self):
self.selection_state = None
def open_in_editor(self, cli):
"""
Open code in editor.
:param cli: :class:`~prompt_toolkit.interface.CommandLineInterface`
instance.
"""
if self.read_only():
raise EditReadOnlyBuffer()
# Write to temporary file
descriptor, filename = tempfile.mkstemp(self.tempfile_suffix)
os.write(descriptor, self.text.encode('utf-8'))
os.close(descriptor)
# Open in editor
# (We need to use `cli.run_in_terminal`, because not all editors go to
# the alternate screen buffer, and some could influence the cursor
# position.)
succes = cli.run_in_terminal(lambda: self._open_file_in_editor(filename))
# Read content again.
if succes:
with open(filename, 'rb') as f:
text = f.read().decode('utf-8')
# Drop trailing newline. (Editors are supposed to add it at the
# end, but we don't need it.)
if text.endswith('\n'):
text = text[:-1]
self.document = Document(
text=text,
cursor_position=len(text))
# Clean up temp file.
os.remove(filename)
def _open_file_in_editor(self, filename):
"""
Call editor executable.
Return True when we received a zero return code.
"""
# If the 'VISUAL' or 'EDITOR' environment variable has been set, use that.
# Otherwise, fall back to the first available editor that we can find.
visual = os.environ.get('VISUAL')
editor = os.environ.get('EDITOR')
editors = [
visual,
editor,
# Order of preference.
'/usr/bin/editor',
'/usr/bin/nano',
'/usr/bin/pico',
'/usr/bin/vi',
'/usr/bin/emacs',
]
for e in editors:
if e:
try:
returncode = subprocess.call([e, filename])
return returncode == 0
except OSError:
# Executable does not exist, try the next one.
pass
return False
def indent(buffer, from_row, to_row, count=1):
"""
Indent text of a :class:`.Buffer` object.
"""
current_row = buffer.document.cursor_position_row
line_range = range(from_row, to_row)
# Apply transformation.
new_text = buffer.transform_lines(line_range, lambda l: ' ' * count + l)
buffer.document = Document(
new_text,
Document(new_text).translate_row_col_to_index(current_row, 0))
# Go to the start of the line.
buffer.cursor_position += buffer.document.get_start_of_line_position(after_whitespace=True)
def unindent(buffer, from_row, to_row, count=1):
"""
Unindent text of a :class:`.Buffer` object.
"""
current_row = buffer.document.cursor_position_row
line_range = range(from_row, to_row)
def transform(text):
remove = ' ' * count
if text.startswith(remove):
return text[len(remove):]
else:
return text.lstrip()
# Apply transformation.
new_text = buffer.transform_lines(line_range, transform)
buffer.document = Document(
new_text,
Document(new_text).translate_row_col_to_index(current_row, 0))
# Go to the start of the line.
buffer.cursor_position += buffer.document.get_start_of_line_position(after_whitespace=True)
def reshape_text(buffer, from_row, to_row):
"""
Reformat text, taking the width into account.
`to_row` is included.
(Vi 'gq' operator.)
"""
lines = buffer.text.splitlines(True)
lines_before = lines[:from_row]
lines_after = lines[to_row + 1:]
lines_to_reformat = lines[from_row:to_row + 1]
if lines_to_reformat:
# Take indentation from the first line.
length = re.search(r'^\s*', lines_to_reformat[0]).end()
indent = lines_to_reformat[0][:length].replace('\n', '')
# Now, take all the 'words' from the lines to be reshaped.
words = ''.join(lines_to_reformat).split()
# And reshape.
width = (buffer.text_width or 80) - len(indent)
reshaped_text = [indent]
current_width = 0
for w in words:
if current_width:
if len(w) + current_width + 1 > width:
reshaped_text.append('\n')
reshaped_text.append(indent)
current_width = 0
else:
reshaped_text.append(' ')
current_width += 1
reshaped_text.append(w)
current_width += len(w)
if reshaped_text[-1] != '\n':
reshaped_text.append('\n')
# Apply result.
buffer.document = Document(
text=''.join(lines_before + reshaped_text + lines_after),
cursor_position=len(''.join(lines_before + reshaped_text)))