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# -*- coding: utf-8 -*-
"""
This module contains the symbol matcher mode
"""
from pyqode.core.api import get_block_symbol_data
from pyqode.core.api.decoration import TextDecoration
from pyqode.core.api.mode import Mode
from pyqode.qt import QtGui
#: symbols indices in SymbolMatcherMode.SYMBOLS map
PAREN = 0
SQUARE = 1
BRACE = 2
#: character indices in SymbolMatcherMode.SYMBOLS map
OPEN = 0
CLOSE = 1
class SymbolMatcherMode(Mode):
""" Highlights matching symbols (parentheses, braces,...)
.. note:: This mode requires the document to be filled with
:class:`pyqode.core.api.TextBlockUserData`, i.e. a
:class:`pyqode.core.api.SyntaxHighlighter` must be installed on
the editor instance.
"""
#: known symbols {SYMBOL: (OPEN, CLOSE)}, you can customise this map to
#: add support for other symbols
SYMBOLS = {
PAREN: ('(', ')'),
SQUARE: ('[', ']'),
BRACE: ('{', '}')
}
@property
def match_background(self):
"""
Background color of matching symbols.
"""
return self._match_background
@match_background.setter
def match_background(self, value):
self._match_background = value
self._refresh_decorations()
if self.editor:
for clone in self.editor.clones:
try:
clone.modes.get(self.__class__).match_background = value
except KeyError:
# this should never happen since we're working with clones
pass
@property
def match_foreground(self):
"""
Foreground color of matching symbols.
"""
return self._match_foreground
@match_foreground.setter
def match_foreground(self, value):
self._match_foreground = value
self._refresh_decorations()
if self.editor:
for clone in self.editor.clones:
try:
clone.modes.get(self.__class__).match_foreground = value
except KeyError:
# this should never happen since we're working with clones
pass
@property
def unmatch_background(self):
"""
Background color of non-matching symbols.
"""
return self._unmatch_background
@unmatch_background.setter
def unmatch_background(self, value):
self._unmatch_background = value
self._refresh_decorations()
if self.editor:
for clone in self.editor.clones:
try:
clone.modes.get(self.__class__).unmatch_background = value
except KeyError:
# this should never happen since we're working with clones
pass
@property
def unmatch_foreground(self):
"""
Foreground color of matching symbols.
"""
return self._unmatch_foreground
@unmatch_foreground.setter
def unmatch_foreground(self, value):
self._unmatch_foreground = value
self._refresh_decorations()
if self.editor:
for clone in self.editor.clones:
try:
clone.modes.get(self.__class__).unmatch_foreground = value
except KeyError:
# this should never happen since we're working with clones
pass
def __init__(self):
super(SymbolMatcherMode, self).__init__()
self._decorations = []
self._match_background = QtGui.QBrush(QtGui.QColor('#B4EEB4'))
self._match_foreground = QtGui.QColor('red')
self._unmatch_background = QtGui.QBrush(QtGui.QColor('transparent'))
self._unmatch_foreground = QtGui.QColor('red')
def _clear_decorations(self):
for deco in self._decorations:
self.editor.decorations.remove(deco)
self._decorations[:] = []
def symbol_pos(self, cursor, character_type=OPEN, symbol_type=PAREN):
"""
Find the corresponding symbol position (line, column) of the specified
symbol. If symbol type is PAREN and character_type is OPEN, the
function will look for '('.
:param cursor: QTextCursor
:param character_type: character type to look for (open or close char)
:param symbol_type: symbol type (index in the SYMBOLS map).
"""
retval = None, None
original_cursor = self.editor.textCursor()
self.editor.setTextCursor(cursor)
block = cursor.block()
data = get_block_symbol_data(self.editor, block)
self._match(symbol_type, data, block.position())
for deco in self._decorations:
if deco.character == self.SYMBOLS[symbol_type][character_type]:
retval = deco.line, deco.column
break
self.editor.setTextCursor(original_cursor)
self._clear_decorations()
return retval
def _refresh_decorations(self):
for deco in self._decorations:
self.editor.decorations.remove(deco)
if deco.match:
deco.set_foreground(self._match_foreground)
deco.set_background(self._match_background)
else:
deco.set_foreground(self._unmatch_foreground)
deco.set_background(self._unmatch_background)
self.editor.decorations.append(deco)
def on_state_changed(self, state):
if state:
self.editor.cursorPositionChanged.connect(self.do_symbols_matching)
else:
self.editor.cursorPositionChanged.disconnect(
self.do_symbols_matching)
def _match(self, symbol, data, cursor_pos):
symbols = data[symbol]
for i, info in enumerate(symbols):
pos = (self.editor.textCursor().position() -
self.editor.textCursor().block().position())
if info.character == self.SYMBOLS[symbol][OPEN] and \
info.position == pos:
self._create_decoration(
cursor_pos + info.position,
self._match_left(
symbol, self.editor.textCursor().block(), i + 1, 0))
elif info.character == self.SYMBOLS[symbol][CLOSE] and \
info.position == pos - 1:
self._create_decoration(
cursor_pos + info.position,
self._match_right(
symbol, self.editor.textCursor().block(), i - 1, 0))
def _match_left(self, symbol, current_block, i, cpt):
while current_block.isValid():
data = get_block_symbol_data(self.editor, current_block)
parentheses = data[symbol]
for j in range(i, len(parentheses)):
info = parentheses[j]
if info.character == self.SYMBOLS[symbol][OPEN]:
cpt += 1
continue
if info.character == self.SYMBOLS[symbol][CLOSE] and cpt == 0:
self._create_decoration(current_block.position() +
info.position)
return True
elif info.character == self.SYMBOLS[symbol][CLOSE]:
cpt -= 1
current_block = current_block.next()
i = 0
return False
def _match_right(self, symbol, current_block, i, nb_right_paren):
while current_block.isValid():
data = get_block_symbol_data(self.editor, current_block)
parentheses = data[symbol]
for j in range(i, -1, -1):
if j >= 0:
info = parentheses[j]
if info.character == self.SYMBOLS[symbol][CLOSE]:
nb_right_paren += 1
continue
if info.character == self.SYMBOLS[symbol][OPEN]:
if nb_right_paren == 0:
self._create_decoration(
current_block.position() + info.position)
return True
else:
nb_right_paren -= 1
current_block = current_block.previous()
data = get_block_symbol_data(self.editor, current_block)
parentheses = data[symbol]
i = len(parentheses) - 1
return False
def do_symbols_matching(self):
"""
Performs symbols matching.
"""
self._clear_decorations()
current_block = self.editor.textCursor().block()
data = get_block_symbol_data(self.editor, current_block)
pos = self.editor.textCursor().block().position()
for symbol in [PAREN, SQUARE, BRACE]:
self._match(symbol, data, pos)
def _create_decoration(self, pos, match=True):
cursor = self.editor.textCursor()
cursor.setPosition(pos)
cursor.movePosition(cursor.NextCharacter, cursor.KeepAnchor)
deco = TextDecoration(cursor, draw_order=10)
deco.line = cursor.blockNumber()
deco.column = cursor.columnNumber()
deco.character = cursor.selectedText()
deco.match = match
if match:
deco.set_foreground(self._match_foreground)
deco.set_background(self._match_background)
else:
deco.set_foreground(self._unmatch_foreground)
deco.set_background(self._unmatch_background)
self._decorations.append(deco)
self.editor.decorations.append(deco)
return cursor
def clone_settings(self, original):
self.match_background = original.match_background
self.match_foreground = original.match_foreground
self.unmatch_background = original.unmatch_background
self.unmatch_foreground = original.unmatch_foreground
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