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# vim:fileencoding=utf-8
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from __future__ import (unicode_literals, division, absolute_import,
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__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
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from operator import itemgetter
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from . import NullSmarts
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from PyQt4.Qt import QTextEdit
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from calibre.gui2 import error_dialog
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get_offset = itemgetter(0)
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PARAGRAPH_SEPARATOR = '\u2029'
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def __init__(self, start_block, tag_start, end_block, tag_end, self_closing=False):
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self.start_block, self.end_block = start_block, end_block
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self.start_offset, self.end_offset = tag_start.offset, tag_end.offset
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tag = tag_start.name or tag_start.prefix
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if tag_start.name and tag_start.prefix:
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tag = tag_start.prefix + ':' + tag
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self.self_closing = self_closing
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def next_tag_boundary(block, offset, forward=True):
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while block.isValid():
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tags = sorted(ud.tags, key=get_offset, reverse=not forward)
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if forward and boundary.offset > offset:
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return block, boundary
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if not forward and boundary.offset < offset:
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return block, boundary
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block = block.next() if forward else block.previous()
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offset = -1 if forward else sys.maxint
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def find_closest_containing_tag(block, offset, max_tags=sys.maxint):
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''' Find the closest containing tag. To find it, we search for the first
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opening tag that does not have a matching closing tag before the specified
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position. Search through at most max_tags. '''
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prev_tag_boundary = lambda b, o: next_tag_boundary(b, o, forward=False)
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block, boundary = prev_tag_boundary(block, offset)
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# We are inside a tag, therefore the containing tag is the parent tag of
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return find_closest_containing_tag(block, boundary.offset)
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block, tag_end = block, boundary
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while block is not None and max_tags > 0:
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sblock, tag_start = prev_tag_boundary(block, tag_end.offset)
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if sblock is None or not tag_start.is_start:
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if tag_start.closing: # A closing tag of the form </a>
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stack.append((tag_start.prefix, tag_start.name))
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elif tag_end.self_closing: # A self closing tag of the form <a/>
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else: # An opening tag, hurray
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prefix, name = stack.pop()
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if (prefix, name) != (tag_start.prefix, tag_start.name):
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# Either we have an unbalanced opening tag or a syntax error, in
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# either case terminate
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return Tag(sblock, tag_start, block, tag_end)
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block, tag_end = prev_tag_boundary(sblock, tag_start.offset)
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return None # Could not find a containing tag
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def find_closing_tag(tag, max_tags=sys.maxint):
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''' Find the closing tag corresponding to the specified tag. To find it we
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search for the first closing tag after the specified tag that does not
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match a previous opening tag. Search through at most max_tags. '''
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block, offset = tag.end_block, tag.end_offset
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while block.isValid() and max_tags > 0:
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block, tag_start = next_tag_boundary(block, offset)
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if block is None or not tag_start.is_start:
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endblock, tag_end = next_tag_boundary(block, tag_start.offset)
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if endblock is None or tag_end.is_start:
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prefix, name = stack.pop()
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if (prefix, name) != (tag_start.prefix, tag_start.name):
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return Tag(block, tag_start, endblock, tag_end)
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elif tag_end.self_closing:
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stack.append((tag_start.prefix, tag_start.name))
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block, offset = endblock, tag_end.offset
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def select_tag(cursor, tag):
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cursor.setPosition(tag.start_block.position() + tag.start_offset)
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cursor.setPosition(tag.end_block.position() + tag.end_offset + 1, cursor.KeepAnchor)
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return unicode(cursor.selectedText()).replace(PARAGRAPH_SEPARATOR, '\n').rstrip('\0')
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def rename_tag(cursor, opening_tag, closing_tag, new_name, insert=False):
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cursor.beginEditBlock()
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text = select_tag(cursor, closing_tag)
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text = '</%s>%s' % (new_name, text)
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text = re.sub(r'^<\s*/\s*[a-zA-Z0-9]+', '</%s' % new_name, text)
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cursor.insertText(text)
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text = select_tag(cursor, opening_tag)
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text += '<%s>' % new_name
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text = re.sub(r'^<\s*[a-zA-Z0-9]+', '<%s' % new_name, text)
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cursor.insertText(text)
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cursor.endEditBlock()
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class HTMLSmarts(NullSmarts):
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def get_extra_selections(self, editor):
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a = QTextEdit.ExtraSelection()
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a.cursor, a.format = editor.textCursor(), editor.match_paren_format
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a.cursor.setPosition(tag.start_block.position() + tag.start_offset)
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a.cursor.setPosition(tag.end_block.position() + tag.end_offset + 1, a.cursor.KeepAnchor)
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c = editor.textCursor()
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block, offset = c.block(), c.positionInBlock()
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tag = find_closest_containing_tag(block, offset, max_tags=2000)
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tag = find_closing_tag(tag, max_tags=4000)
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def rename_block_tag(self, editor, new_name):
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c = editor.textCursor()
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block, offset = c.block(), c.positionInBlock()
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tag = find_closest_containing_tag(block, offset)
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block, offset = tag.start_block, tag.start_offset
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'address', 'article', 'aside', 'blockquote', 'center',
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'dir', 'fieldset', 'isindex', 'menu', 'noframes', 'hgroup',
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'noscript', 'pre', 'section', 'h1', 'h2', 'h3', 'h4', 'h5',
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'h6', 'header', 'p', 'div', 'dd', 'dl', 'ul', 'ol', 'li', 'body',
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closing_tag = find_closing_tag(tag)
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if closing_tag is None:
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return error_dialog(editor, _('Invalid HTML'), _(
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'There is an unclosed %s tag. You should run the Fix HTML tool'
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' before trying to rename tags.') % tag.name, show=True)
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rename_tag(c, tag, closing_tag, new_name, insert=tag.name in {'body', 'td', 'th', 'li'})
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return error_dialog(editor, _('No found'), _(
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'No suitable block level tag was found to rename'), show=True)
added
removed
src/calibre/gui2/tweak_book/editor/smart/html.py
