Current File : //usr/lib/calibre/calibre/ebooks/oeb/polish/pretty.py
#!/usr/bin/env python3
__license__ = 'GPL v3'
__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
import textwrap
from polyglot.builtins import iteritems
# from lxml.etree import Element
from calibre import force_unicode
from calibre.ebooks.oeb.base import (
serialize, OEB_DOCS, barename, OEB_STYLES, XPNSMAP, XHTML, SVG)
from calibre.ebooks.oeb.polish.container import OPF_NAMESPACES
from calibre.ebooks.oeb.polish.utils import guess_type
from calibre.utils.icu import sort_key
def isspace(x):
return not x.strip('\u0009\u000a\u000c\u000d\u0020')
def pretty_xml_tree(elem, level=0, indent=' '):
''' XML beautifier, assumes that elements that have children do not have
textual content. Also assumes that there is no text immediately after
closing tags. These are true for opf/ncx and container.xml files. If either
of the assumptions are violated, there should be no data loss, but pretty
printing won't produce optimal results.'''
if (not elem.text and len(elem) > 0) or (elem.text and isspace(elem.text)):
elem.text = '\n' + (indent * (level+1))
for i, child in enumerate(elem):
pretty_xml_tree(child, level=level+1, indent=indent)
if not child.tail or isspace(child.tail):
l = level + 1
if i == len(elem) - 1:
l -= 1
child.tail = '\n' + (indent * l)
def pretty_opf(root):
# Put all dc: tags first starting with title and author. Preserve order for
# the rest.
def dckey(x):
return {'title':0, 'creator':1}.get(barename(x.tag), 2)
for metadata in root.xpath('//opf:metadata', namespaces=OPF_NAMESPACES):
dc_tags = metadata.xpath('./*[namespace-uri()="%s"]' % OPF_NAMESPACES['dc'])
dc_tags.sort(key=dckey)
for x in reversed(dc_tags):
metadata.insert(0, x)
# Group items in the manifest
spine_ids = root.xpath('//opf:spine/opf:itemref/@idref', namespaces=OPF_NAMESPACES)
spine_ids = {x:i for i, x in enumerate(spine_ids)}
def manifest_key(x):
mt = x.get('media-type', '')
href = x.get('href', '')
ext = href.rpartition('.')[-1].lower()
cat = 1000
if mt in OEB_DOCS:
cat = 0
elif mt == guess_type('a.ncx'):
cat = 1
elif mt in OEB_STYLES:
cat = 2
elif mt.startswith('image/'):
cat = 3
elif ext in {'otf', 'ttf', 'woff'}:
cat = 4
elif mt.startswith('audio/'):
cat = 5
elif mt.startswith('video/'):
cat = 6
if cat == 0:
i = spine_ids.get(x.get('id', None), 1000000000)
else:
i = sort_key(href)
return (cat, i)
for manifest in root.xpath('//opf:manifest', namespaces=OPF_NAMESPACES):
try:
children = sorted(manifest, key=manifest_key)
except AttributeError:
continue # There are comments so dont sort since that would mess up the comments
for x in reversed(children):
manifest.insert(0, x)
SVG_TAG = SVG('svg')
BLOCK_TAGS = frozenset(map(XHTML, (
'address', 'article', 'aside', 'audio', 'blockquote', 'body', 'canvas', 'col', 'colgroup', 'dd',
'div', 'dl', 'dt', 'fieldset', 'figcaption', 'figure', 'footer', 'form',
'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'li',
'noscript', 'ol', 'output', 'p', 'pre', 'script', 'section', 'style', 'table', 'tbody', 'td',
'tfoot', 'th', 'thead', 'tr', 'ul', 'video', 'img'))) | {SVG_TAG}
def isblock(x):
if callable(x.tag) or not x.tag:
return True
if x.tag in BLOCK_TAGS:
return True
return False
def has_only_blocks(x):
if hasattr(x.tag, 'split') and len(x) == 0:
# Tag with no children,
return False
if x.text and not isspace(x.text):
return False
for child in x:
if not isblock(child) or (child.tail and not isspace(child.tail)):
return False
return True
def indent_for_tag(x):
prev = x.getprevious()
x = x.getparent().text if prev is None else prev.tail
if not x:
return ''
s = x.rpartition('\n')[-1]
return s if isspace(s) else ''
def set_indent(elem, attr, indent):
x = getattr(elem, attr)
if not x:
x = indent
else:
lines = x.splitlines()
if isspace(lines[-1]):
lines[-1] = indent
else:
lines.append(indent)
x = '\n'.join(lines)
setattr(elem, attr, x)
def pretty_block(parent, level=1, indent=' '):
''' Surround block tags with blank lines and recurse into child block tags
that contain only other block tags '''
if not parent.text or isspace(parent.text):
parent.text = ''
nn = '\n' if hasattr(parent.tag, 'strip') and barename(parent.tag) in {'tr', 'td', 'th'} else '\n\n'
parent.text = parent.text + nn + (indent * level)
for i, child in enumerate(parent):
if isblock(child) and has_only_blocks(child):
pretty_block(child, level=level+1, indent=indent)
elif child.tag == SVG_TAG:
pretty_xml_tree(child, level=level, indent=indent)
l = level
if i == len(parent) - 1:
l -= 1
if not child.tail or isspace(child.tail):
child.tail = ''
child.tail = child.tail + nn + (indent * l)
def pretty_script_or_style(container, child):
if child.text:
indent = indent_for_tag(child)
if child.tag.endswith('style'):
child.text = force_unicode(pretty_css(container, '', child.text), 'utf-8')
child.text = textwrap.dedent(child.text)
child.text = '\n' + '\n'.join([(indent + x) if x else '' for x in child.text.splitlines()])
set_indent(child, 'text', indent)
def pretty_html_tree(container, root):
root.text = '\n\n'
for child in root:
child.tail = '\n\n'
if hasattr(child.tag, 'endswith') and child.tag.endswith('}head'):
pretty_xml_tree(child)
for body in root.findall('h:body', namespaces=XPNSMAP):
pretty_block(body)
# Special case the handling of a body that contains a single block tag
# with all content. In this case we prettify the containing block tag
# even if it has non block children.
if (len(body) == 1 and not callable(body[0].tag) and isblock(body[0]) and not has_only_blocks(
body[0]) and barename(body[0].tag) not in (
'pre', 'p', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6') and len(body[0]) > 0):
pretty_block(body[0], level=2)
if container is not None:
# Handle <script> and <style> tags
for child in root.xpath('//*[local-name()="script" or local-name()="style"]'):
pretty_script_or_style(container, child)
def fix_html(container, raw):
' Fix any parsing errors in the HTML represented as a string in raw. Fixing is done using the HTML5 parsing algorithm. '
root = container.parse_xhtml(raw)
return serialize(root, 'text/html')
def pretty_html(container, name, raw):
' Pretty print the HTML represented as a string in raw '
root = container.parse_xhtml(raw)
pretty_html_tree(container, root)
return serialize(root, 'text/html')
def pretty_css(container, name, raw):
' Pretty print the CSS represented as a string in raw '
sheet = container.parse_css(raw)
return serialize(sheet, 'text/css')
def pretty_xml(container, name, raw):
' Pretty print the XML represented as a string in raw. If ``name`` is the name of the OPF, extra OPF-specific prettying is performed. '
root = container.parse_xml(raw)
if name == container.opf_name:
pretty_opf(root)
pretty_xml_tree(root)
return serialize(root, 'text/xml')
def fix_all_html(container):
' Fix any parsing errors in all HTML files in the container. Fixing is done using the HTML5 parsing algorithm. '
for name, mt in iteritems(container.mime_map):
if mt in OEB_DOCS:
container.parsed(name)
container.dirty(name)
def pretty_all(container):
' Pretty print all HTML/CSS/XML files in the container '
xml_types = {guess_type('a.ncx'), guess_type('a.xml'), guess_type('a.svg')}
for name, mt in iteritems(container.mime_map):
prettied = False
if mt in OEB_DOCS:
pretty_html_tree(container, container.parsed(name))
prettied = True
elif mt in OEB_STYLES:
container.parsed(name)
prettied = True
elif name == container.opf_name:
root = container.parsed(name)
pretty_opf(root)
pretty_xml_tree(root)
prettied = True
elif mt in xml_types:
pretty_xml_tree(container.parsed(name))
prettied = True
if prettied:
container.dirty(name)
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