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# -*- coding: utf-8 -*-
"""
Contains the default indenter.
"""
import logging
from pyqode.core.api import TextHelper
from pyqode.core.api.mode import Mode
from pyqode.qt import QtGui
def _logger():
return logging.getLogger(__name__)
def debug(msg, *args):
return _logger().log(5, msg, *args)
class IndenterMode(Mode):
""" Implements classic indentation/tabulation (Tab/Shift+Tab)
It inserts/removes tabulations (a series of spaces defined by the
tabLength settings) at the cursor position if there is no selection,
otherwise it fully indents/un-indents selected lines.
To trigger an indentation/un-indentation programatically, you must emit
:attr:`pyqode.core.api.CodeEdit.indent_requested` or
:attr:`pyqode.core.api.CodeEdit.unindent_requested`.
"""
def __init__(self):
super(IndenterMode, self).__init__()
def on_state_changed(self, state):
if state:
self.editor.indent_requested.connect(self.indent)
self.editor.unindent_requested.connect(self.unindent)
else:
self.editor.indent_requested.disconnect(self.indent)
self.editor.unindent_requested.disconnect(self.unindent)
def indent_selection(self, cursor):
"""
Indent selected text
:param cursor: QTextCursor
"""
doc = self.editor.document()
tab_len = self.editor.tab_length
cursor.beginEditBlock()
nb_lines = len(cursor.selection().toPlainText().splitlines())
c = self.editor.textCursor()
if c.atBlockStart() and c.position() == c.selectionEnd():
nb_lines += 1
block = doc.findBlock(cursor.selectionStart())
i = 0
# indent every lines
while i < nb_lines:
nb_space_to_add = tab_len
cursor = QtGui.QTextCursor(block)
cursor.movePosition(cursor.StartOfLine, cursor.MoveAnchor)
if self.editor.use_spaces_instead_of_tabs:
for _ in range(nb_space_to_add):
cursor.insertText(" ")
else:
cursor.insertText('\t')
block = block.next()
i += 1
cursor.endEditBlock()
def unindent_selection(self, cursor):
"""
Un-indents selected text
:param cursor: QTextCursor
"""
doc = self.editor.document()
tab_len = self.editor.tab_length
nb_lines = len(cursor.selection().toPlainText().splitlines())
if nb_lines == 0:
nb_lines = 1
block = doc.findBlock(cursor.selectionStart())
assert isinstance(block, QtGui.QTextBlock)
i = 0
debug('unindent selection: %d lines', nb_lines)
while i < nb_lines:
txt = block.text()
debug('line to unindent: %s', txt)
debug('self.editor.use_spaces_instead_of_tabs: %r',
self.editor.use_spaces_instead_of_tabs)
if self.editor.use_spaces_instead_of_tabs:
indentation = (len(txt) - len(txt.lstrip()))
else:
indentation = len(txt) - len(txt.replace('\t', ''))
debug('unindent line %d: %d spaces', i, indentation)
if indentation > 0:
c = QtGui.QTextCursor(block)
c.movePosition(c.StartOfLine, cursor.MoveAnchor)
for _ in range(tab_len):
txt = block.text()
if len(txt) and txt[0] == ' ':
c.deleteChar()
block = block.next()
i += 1
return cursor
def indent(self):
"""
Indents text at cursor position.
"""
cursor = self.editor.textCursor()
assert isinstance(cursor, QtGui.QTextCursor)
if cursor.hasSelection():
self.indent_selection(cursor)
else:
# simply insert indentation at the cursor position
tab_len = self.editor.tab_length
cursor.beginEditBlock()
if self.editor.use_spaces_instead_of_tabs:
nb_space_to_add = tab_len - cursor.positionInBlock() % tab_len
cursor.insertText(nb_space_to_add * " ")
else:
cursor.insertText('\t')
cursor.endEditBlock()
def count_deletable_spaces(self, cursor, max_spaces):
# count the number of spaces deletable, stop at tab len
max_spaces = abs(max_spaces)
if max_spaces > self.editor.tab_length:
max_spaces = self.editor.tab_length
spaces = 0
trav_cursor = QtGui.QTextCursor(cursor)
while spaces < max_spaces or trav_cursor.atBlockStart():
pos = trav_cursor.position()
trav_cursor.movePosition(cursor.Left, cursor.KeepAnchor)
char = trav_cursor.selectedText()
if char == " ":
spaces += 1
else:
break
trav_cursor.setPosition(pos - 1)
return spaces
def unindent(self):
"""
Un-indents text at cursor position.
"""
debug('unindent')
cursor = self.editor.textCursor()
debug('cursor has selection %r', cursor.hasSelection())
if cursor.hasSelection():
cursor.beginEditBlock()
self.unindent_selection(cursor)
cursor.endEditBlock()
self.editor.setTextCursor(cursor)
else:
tab_len = self.editor.tab_length
indentation = cursor.positionInBlock()
max_spaces = tab_len - (indentation - (indentation % tab_len))
spaces = self.count_deletable_spaces(cursor, max_spaces)
debug('deleting %d space before cursor' % spaces)
cursor.beginEditBlock()
if spaces:
# delete spaces before cursor
for _ in range(spaces):
cursor.deletePreviousChar()
else:
# un-indent whole line
debug('un-indent whole line')
cursor = self.unindent_selection(cursor)
cursor.endEditBlock()
self.editor.setTextCursor(cursor)
debug(cursor.block().text())
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