##// END OF EJS Templates
Line continuations now terminate after one blank line (#2108)...
Line continuations now terminate after one blank line (#2108) Previously, we had In [1]: 1\ ...: ...: ...: ...: In other words, no amount of blank lines would terminate after a line continuation, in contrast with regular Python: >>> 1\ ... 1 This made things really annoying when I typed \ instead of a newline--quite easy to do since they are right next to each other on the keyboard. Now, we have In [1]: 1\ ...: Out[1]: 1 This also fixes another related behavioral difference between IPython. If a space follows a line continuation character, it should be a SyntaxError("unexpected character after line continuation character"), even if the line is otherwise continuable, according to regular Python (e.g., `1 \ ` or `(1 + \ `). This now consistent between the two. Closes #2108

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bracket_matcher.py
100 lines | 3.7 KiB | text/x-python | PythonLexer
""" Provides bracket matching for Q[Plain]TextEdit widgets.
"""
# System library imports
from IPython.external.qt import QtCore, QtGui
class BracketMatcher(QtCore.QObject):
""" Matches square brackets, braces, and parentheses based on cursor
position.
"""
# Protected class variables.
_opening_map = { '(':')', '{':'}', '[':']' }
_closing_map = { ')':'(', '}':'{', ']':'[' }
#--------------------------------------------------------------------------
# 'QObject' interface
#--------------------------------------------------------------------------
def __init__(self, text_edit):
""" Create a call tip manager that is attached to the specified Qt
text edit widget.
"""
assert isinstance(text_edit, (QtGui.QTextEdit, QtGui.QPlainTextEdit))
super(BracketMatcher, self).__init__()
# The format to apply to matching brackets.
self.format = QtGui.QTextCharFormat()
self.format.setBackground(QtGui.QColor('silver'))
self._text_edit = text_edit
text_edit.cursorPositionChanged.connect(self._cursor_position_changed)
#--------------------------------------------------------------------------
# Protected interface
#--------------------------------------------------------------------------
def _find_match(self, position):
""" Given a valid position in the text document, try to find the
position of the matching bracket. Returns -1 if unsuccessful.
"""
# Decide what character to search for and what direction to search in.
document = self._text_edit.document()
start_char = document.characterAt(position)
search_char = self._opening_map.get(start_char)
if search_char:
increment = 1
else:
search_char = self._closing_map.get(start_char)
if search_char:
increment = -1
else:
return -1
# Search for the character.
char = start_char
depth = 0
while position >= 0 and position < document.characterCount():
if char == start_char:
depth += 1
elif char == search_char:
depth -= 1
if depth == 0:
break
position += increment
char = document.characterAt(position)
else:
position = -1
return position
def _selection_for_character(self, position):
""" Convenience method for selecting a character.
"""
selection = QtGui.QTextEdit.ExtraSelection()
cursor = self._text_edit.textCursor()
cursor.setPosition(position)
cursor.movePosition(QtGui.QTextCursor.NextCharacter,
QtGui.QTextCursor.KeepAnchor)
selection.cursor = cursor
selection.format = self.format
return selection
#------ Signal handlers ----------------------------------------------------
def _cursor_position_changed(self):
""" Updates the document formatting based on the new cursor position.
"""
# Clear out the old formatting.
self._text_edit.setExtraSelections([])
# Attempt to match a bracket for the new cursor position.
cursor = self._text_edit.textCursor()
if not cursor.hasSelection():
position = cursor.position() - 1
match_position = self._find_match(position)
if match_position != -1:
extra_selections = [ self._selection_for_character(pos)
for pos in (position, match_position) ]
self._text_edit.setExtraSelections(extra_selections)