def _format_css_rules(content: list, indent_level: int) -> str:
"""
Helper function for CSS formatting that formats a list of CSS selectors.
INPUTS
content: A list of component values generated by the tinycss2 library
OUTPUTS
A string of formatted CSS
"""
output = ""
for token in tinycss2.parse_rule_list(content):
if token.type == "error":
raise se.InvalidCssException("Couldn’t parse CSS. Exception: {token.message}")
if token.type == "qualified-rule":
output += ("\t" * indent_level) + _format_css_component_list(token.prelude, True).replace("\n", "\n" + ("\t" * indent_level)) + "{\n" + _format_css_declarations(token.content, indent_level + 1) + "\n" + ("\t" * indent_level) + "}\n\n"
if token.type == "at-rule":
output += ("\t" * indent_level) + "@" + token.lower_at_keyword + " " + _format_css_component_list(token.prelude, True).replace("\n", " ") + "{\n" + _format_css_rules(token.content, indent_level + 1) + "\n" + ("\t" * indent_level) + "}\n\n"
if token.type == "comment":
# House style: If the comment starts with /* End, then attach it to the previous block
if token.value.strip().lower().startswith("end"):
output = output.rstrip() + "\n"
output += ("\t" * indent_level) + "/* " + token.value.strip() + " */\n"
if token.value.strip().lower().startswith("end"):
output += "\n"
return output.rstrip()
def _format_css_declarations(content: list, indent_level: int) -> str:
"""
Helper function for CSS formatting that formats a list of CSS properties, like `margin: 1em;`.
INPUTS
content: A list of component values generated by the tinycss2 library
OUTPUTS
A string of formatted CSS
"""
output = ""
for token in tinycss2.parse_declaration_list(content):
if token.type == "error":
raise se.InvalidCssException(token.message)
if token.type == "declaration":
output += ("\t" * indent_level) + token.lower_name + ": "
output += _format_css_component_list(token.value)
if token.important:
output += " !important"
output += ";\n"
if token.type == "comment":
output = output.rstrip()
if output == "":
output += ("\t" * indent_level
) + "/* " + token.value.strip() + " */\n"
else:
output += " /* " + token.value.strip() + " */\n"
return output.rstrip()
def _format_style_elements(tree: etree.ElementTree):
"""
Find <style> elements in an XML etree, and pretty-print the CSS inside of them.
The passed tree is modified in-place.
INPUTS
tree: An XML etree.
OUTPUTS
None.
"""
try:
for node in tree.xpath("//svg:style", namespaces={"xhtml": "http://www.w3.org/1999/xhtml", "svg": "http://www.w3.org/2000/svg"}):
css = format_css(node.text)
# Get the <style> element's indentation
indent = node.xpath("preceding-sibling::text()[1]")[0].replace("\n", "")
# Indent the CSS one level deeper than the <style> element
css = ''.join(indent + "\t" + line + "\n" for line in css.splitlines())
css = css.strip("\n")
css = regex.sub(r"^\s+$", "", css, flags=regex.MULTILINE) # Remove indents from lines that are just white space
node.text = "\n" + css + "\n" + indent
except se.InvalidCssException as ex:
raise ex
except Exception as ex:
raise se.InvalidCssException(f"Couldn’t parse CSS. Exception: {ex}")
def _add_svg_paths_to_group(g_elem: etree.Element, text_properties: Dict) -> None:
# Required properties to make any progress
for key in "x y font text font-size".split():
if not key in text_properties:
raise se.InvalidCssException(f"svg_text_to_paths: Missing key [text]{key}[/] in [text]text_properties[/] for [xml]<{g_elem.tag}>[/] element in [path]./images/titlepage.svg[/] or [path]./images/cover.svg[/].")
# We know we have x, y, text, font-size, and font so we can render vectors.
# Now set up some defaults if not specified.
text_properties["font-size"] = float(text_properties["font-size"].replace("px", "")) # NOTE assumes pixels and ignores it
font = text_properties["font"]
if not "letter-spacing" in text_properties:
text_properties["letter-spacing"] = 0
text_properties["letter-spacing"] = float(text_properties["letter-spacing"].replace("px", ""))
if not "text-anchor" in text_properties:
text_properties["text-anchor"] = "left"
if not "units-per-em" in text_properties:
text_properties["units-per-em"] = float(font["meta"]["font-face"]["units-per-em"])
if not "horiz-adv-x" in text_properties:
text_properties["horiz-adv-x"] = float(font["meta"]["horiz-adv-x"])
font = text_properties["font"]
text_string = text_properties["text"]
width = 0.0
if text_properties["text-anchor"] == "middle" or text_properties["text-anchor"] == "center" or \
text_properties["text-anchor"] == "right" or text_properties["text-anchor"] == "end":
width = _get_text_width(text_string, font, text_properties)
last_xy = [0.0, 0.0]
last_xy[0] = float(text_properties["x"])
if text_properties["text-anchor"] == "middle" or text_properties["text-anchor"] == "center":
last_xy[0] -= width / 2.0
elif text_properties["text-anchor"] == "right" or text_properties["text-anchor"] == "end":
last_xy[0] -= width
last_xy[1] = float(text_properties["y"])
path_ds = []
def walker(d_attrib: str, size: float, delta_x: float, delta_y: float) -> None:
# Render a glyph (text representaiton of a path outline) to a properly
# translated and scaled path outline.
d_attrib = _d_translate_and_scale(d_attrib, last_xy[0], last_xy[1], size, -size)
if d_attrib != "":
path_ds.append(d_attrib)
last_xy[0] += delta_x
last_xy[1] += delta_y
_walk_characters(text_string, font, text_properties, last_xy[0], last_xy[1], walker)
# Append each glyph outline as its own <path> tag, as Inkscape would do.
for d_attr in path_ds:
path_elem = etree.Element("path", {"d": d_attr})
path_elem.tail = "\n"
g_elem.append(path_elem) # ?
def css_select(self, selector: str):
"""
Shortcut to select elements based on CSS selector.
"""
try:
sel = CSS_SELECTOR_CACHE.get(selector)
if not sel:
sel = cssselect.CSSSelector(selector,
translator="xhtml",
namespaces={
"xhtml":
"http://www.w3.org/1999/xhtml",
"epub":
"http://www.idpf.org/2007/ops"
})
CSS_SELECTOR_CACHE[selector] = sel
return self.xpath(sel.path)
except parser.SelectorSyntaxError as ex:
raise se.InvalidCssException(
f"Invalid selector: [css]{selector}[/]") from ex
def format_css(css: str) -> str:
"""
Format a string of CSS to house style.
INPUTS
css: A string of well-formed CSS
OUTPUTS
A string of formatted CSS
"""
css_header = ""
css_body = ""
for token in tinycss2.parse_stylesheet(css, skip_comments=False):
if token.type == "error":
raise se.InvalidCssException(token.message)
if token.type == "at-rule":
# These three (should) occur at the head of the CSS.
if token.lower_at_keyword == "charset":
css_header += "@" + token.lower_at_keyword + " \"" + token.prelude[
1].value.lower() + "\";\n"
if token.lower_at_keyword == "namespace":
css_header += "@" + token.lower_at_keyword + " " + token.prelude[
1].value + " \"" + token.prelude[3].value + "\";\n"
if token.lower_at_keyword == "font-face":
css_header += "\n@" + token.lower_at_keyword + "{\n" + _format_css_declarations(
token.content, 1) + "\n}\n"
# Unlike the previous items, these occur in the CSS body.
if token.lower_at_keyword == "supports":
css_body += "@" + token.lower_at_keyword + _format_css_component_list(
token.prelude, False, True) + "{\n" + _format_css_rules(
token.content, 1) + "\n}\n\n"
if token.lower_at_keyword == "media":
css_body += "@" + token.lower_at_keyword + " " + _format_css_component_list(
token.prelude).replace("\n", " ",
True) + "{\n" + _format_css_rules(
token.content, 1) + "\n}\n\n"
# Selectors, including their rules.
# tinycss2 differentiates between selectors and their rules that are at the top level,
# and selectors and rules in nested blocks (like @supports).
if token.type == "qualified-rule":
css_body += _format_css_component_list(
token.prelude, True) + "{\n" + _format_css_declarations(
token.content, 1) + "\n}\n\n"
if token.type == "comment":
# House style: If the comment starts with /* End, then attach it to the previous block
if token.value.strip().lower().startswith("end"):
css_body = css_body.rstrip() + "\n"
css_body += "/* " + token.value.strip() + " */\n"
if token.value.strip().lower().startswith("end"):
css_body += "\n"
output = (css_header + "\n" + css_body).strip() + "\n"
# Do a quick regex to move parens next to media rules
output = regex.sub(r"(@[a-z]+) \(", "\\1(", output)
# Remove empty rules
output = regex.sub(r"^\t*[^\{\}]+?\{\s*\}\n",
"",
output,
flags=regex.DOTALL | regex.MULTILINE)
return output
def build(self, metadata_xhtml: str, metadata_tree: se.easy_xml.EasyXmlTree, run_epubcheck: bool, build_kobo: bool, build_kindle: bool, output_directory: Path, proof: bool, build_covers: bool, verbose: bool) -> None:
"""
Entry point for `se build`
"""
# Check for some required tools
if build_kindle:
which_ebook_convert = shutil.which("ebook-convert")
if which_ebook_convert:
ebook_convert_path = Path(which_ebook_convert)
else:
# Look for default Mac calibre app path if none found in path
ebook_convert_path = Path("/Applications/calibre.app/Contents/MacOS/ebook-convert")
if not ebook_convert_path.exists():
raise se.MissingDependencyException("Couldn’t locate ebook-convert. Is Calibre installed?")
if run_epubcheck:
if not shutil.which("java"):
raise se.MissingDependencyException("Couldn’t locate java. Is it installed?")
# Check the output directory and create it if it doesn't exist
try:
output_directory = output_directory.resolve()
output_directory.mkdir(parents=True, exist_ok=True)
except Exception:
raise se.FileExistsException(f"Couldn’t create output directory: {output_directory}")
# All clear to start building!
if verbose:
print(f"Building {self.path} ...")
with tempfile.TemporaryDirectory() as temp_directory:
work_directory = Path(temp_directory)
work_epub_root_directory = work_directory / "src"
copy_tree(self.path, str(work_directory))
try:
shutil.rmtree(work_directory / ".git")
except Exception:
pass
# By convention the ASIN is set to the SHA-1 sum of the book's identifying URL
identifier = metadata_tree.xpath("//dc:identifier")[0].inner_html().replace("url:", "")
asin = sha1(identifier.encode("utf-8")).hexdigest()
title = metadata_tree.xpath("//dc:title")[0].inner_html()
url_title = se.formatting.make_url_safe(title)
url_author = ""
for author in metadata_tree.xpath("//dc:creator"):
url_author = url_author + se.formatting.make_url_safe(author.inner_html()) + "_"
url_author = url_author.rstrip("_")
epub_output_filename = "{}_{}{}.epub".format(url_author, url_title, ".proof" if proof else "")
epub3_output_filename = "{}_{}{}.epub3".format(url_author, url_title, ".proof" if proof else "")
kobo_output_filename = "{}_{}{}.kepub.epub".format(url_author, url_title, ".proof" if proof else "")
kindle_output_filename = "{}_{}{}.azw3".format(url_author, url_title, ".proof" if proof else "")
# Clean up old output files if any
se.quiet_remove(output_directory / f"thumbnail_{asin}_EBOK_portrait.jpg")
se.quiet_remove(output_directory / "cover.jpg")
se.quiet_remove(output_directory / "cover-thumbnail.jpg")
se.quiet_remove(output_directory / epub_output_filename)
se.quiet_remove(output_directory / epub3_output_filename)
se.quiet_remove(output_directory / kobo_output_filename)
se.quiet_remove(output_directory / kindle_output_filename)
# Are we including proofreading CSS?
if proof:
with open(work_epub_root_directory / "epub" / "css" / "local.css", "a", encoding="utf-8") as local_css_file:
with importlib_resources.open_text("se.data.templates", "proofreading.css", encoding="utf-8") as proofreading_css_file:
local_css_file.write(proofreading_css_file.read())
# Update the release date in the metadata and colophon
if self.last_commit:
last_updated_iso = regex.sub(r"\.[0-9]+$", "", self.last_commit.timestamp.isoformat()) + "Z"
last_updated_iso = regex.sub(r"\+.+?Z$", "Z", last_updated_iso)
# In the line below, we can't use %l (unpadded 12 hour clock hour) because it isn't portable to Windows.
# Instead we use %I (padded 12 hour clock hour) and then do a string replace to remove leading zeros.
last_updated_friendly = f"{self.last_commit.timestamp:%B %e, %Y, %I:%M <abbr class=\"time eoc\">%p</abbr>}".replace(" 0", " ")
last_updated_friendly = regex.sub(r"\s+", " ", last_updated_friendly).replace("AM", "a.m.").replace("PM", "p.m.").replace(" <abbr", " <abbr")
# Set modified date in content.opf
self.metadata_xhtml = regex.sub(r"<meta property=\"dcterms:modified\">[^<]+?</meta>", f"<meta property=\"dcterms:modified\">{last_updated_iso}</meta>", self.metadata_xhtml)
with open(work_epub_root_directory / "epub" / "content.opf", "w", encoding="utf-8") as file:
file.seek(0)
file.write(self.metadata_xhtml)
file.truncate()
# Update the colophon with release info
with open(work_epub_root_directory / "epub" / "text" / "colophon.xhtml", "r+", encoding="utf-8") as file:
xhtml = file.read()
xhtml = xhtml.replace("<p>The first edition of this ebook was released on<br/>", f"<p>This edition was released on<br/>\n\t\t\t<b>{last_updated_friendly}</b><br/>\n\t\t\tand is based on<br/>\n\t\t\t<b>revision {self.last_commit.short_sha}</b>.<br/>\n\t\t\tThe first edition of this ebook was released on<br/>")
file.seek(0)
file.write(xhtml)
file.truncate()
# Output the pure epub3 file
if verbose:
print(f"\tBuilding {epub3_output_filename} ...", end="", flush=True)
se.epub.write_epub(work_epub_root_directory, output_directory / epub3_output_filename)
if verbose:
print(" OK")
if build_kobo:
if verbose:
print(f"\tBuilding {kobo_output_filename} ...", end="", flush=True)
else:
if verbose:
print(f"\tBuilding {epub_output_filename} ...", end="", flush=True)
# Now add epub2 compatibility.
# Include compatibility CSS
with open(work_epub_root_directory / "epub" / "css" / "core.css", "a", encoding="utf-8") as core_css_file:
with importlib_resources.open_text("se.data.templates", "compatibility.css", encoding="utf-8") as compatibility_css_file:
core_css_file.write(compatibility_css_file.read())
# Simplify CSS and tags
total_css = ""
# Simplify the CSS first. Later we'll update the document to match our simplified selectors.
# While we're doing this, we store the original css into a single variable so we can extract the original selectors later.
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in fnmatch.filter(filenames, "*.css"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
css = file.read()
# Before we do anything, we process a special case in core.css
if "core.css" in filename:
css = regex.sub(r"abbr{.+?}", "", css, flags=regex.DOTALL)
total_css = total_css + css + "\n"
file.seek(0)
file.write(se.formatting.simplify_css(css))
file.truncate()
# Now get a list of original selectors
# Remove @supports(){}
total_css = regex.sub(r"@supports.+?{(.+?)}\s*}", "\\1}", total_css, flags=regex.DOTALL)
# Remove CSS rules
total_css = regex.sub(r"{[^}]+}", "", total_css)
# Remove trailing commas
total_css = regex.sub(r",", "", total_css)
# Remove comments
total_css = regex.sub(r"/\*.+?\*/", "", total_css, flags=regex.DOTALL)
# Remove @ defines
total_css = regex.sub(r"^@.+", "", total_css, flags=regex.MULTILINE)
# Construct a dictionary of the original selectors
selectors = {line for line in total_css.splitlines() if line != ""}
# Get a list of .xhtml files to simplify
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in fnmatch.filter(filenames, "*.xhtml"):
# Don't mess with the ToC, since if we have ol/li > first-child selectors we could screw it up
if filename == "toc.xhtml":
continue
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
# We have to remove the default namespace declaration from our document, otherwise
# xpath won't find anything at all. See http://stackoverflow.com/questions/297239/why-doesnt-xpath-work-when-processing-an-xhtml-document-with-lxml-in-python
xhtml = file.read().replace(" xmlns=\"http://www.w3.org/1999/xhtml\"", "")
processed_xhtml = xhtml
try:
tree = etree.fromstring(str.encode(xhtml))
except Exception as ex:
raise se.InvalidXhtmlException(f"Error parsing XHTML file: {filename}\n{ex}")
# Now iterate over each CSS selector and see if it's used in any of the files we found
for selector in selectors:
try:
# Add classes to elements that match any of our selectors to simplify. For example, if we select :first-child, add a "first-child" class to all elements that match that.
for selector_to_simplify in se.SELECTORS_TO_SIMPLIFY:
while selector_to_simplify in selector:
# Potentially the pseudoclass we’ll simplify isn’t at the end of the selector,
# so we need to temporarily remove the trailing part to target the right elements.
split_selector = regex.split(fr"({selector_to_simplify}(\(.*?\))?)", selector, 1)
target_element_selector = ''.join(split_selector[0:2])
replacement_class = split_selector[1].replace(":", "").replace("(", "-").replace("n-", "n-minus-").replace("n+", "n-plus-").replace(")", "")
selector = selector.replace(split_selector[1], "." + replacement_class, 1)
sel = lxml.cssselect.CSSSelector(target_element_selector, translator="xhtml", namespaces=se.XHTML_NAMESPACES)
for element in tree.xpath(sel.path, namespaces=se.XHTML_NAMESPACES):
current_class = element.get("class")
if current_class is not None and replacement_class not in current_class:
current_class = current_class + " " + replacement_class
else:
current_class = replacement_class
element.set("class", current_class)
except lxml.cssselect.ExpressionError:
# This gets thrown if we use pseudo-elements, which lxml doesn't support
pass
except lxml.cssselect.SelectorSyntaxError as ex:
raise se.InvalidCssException(f"Couldn't parse CSS in or near this line: {selector}\n{ex}")
# We've already replaced attribute/namespace selectors with classes in the CSS, now add those classes to the matching elements
if "[epub|type" in selector:
for namespace_selector in regex.findall(r"\[epub\|type\~\=\"[^\"]*?\"\]", selector):
sel = lxml.cssselect.CSSSelector(namespace_selector, translator="xhtml", namespaces=se.XHTML_NAMESPACES)
for element in tree.xpath(sel.path, namespaces=se.XHTML_NAMESPACES):
new_class = regex.sub(r"^\.", "", se.formatting.namespace_to_class(namespace_selector))
current_class = element.get("class", "")
if new_class not in current_class:
current_class = f"{current_class} {new_class}".strip()
element.set("class", current_class)
processed_xhtml = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" + etree.tostring(tree, encoding=str, pretty_print=True)
# We do this round in a second pass because if we modify the tree like this, it screws up how lxml does processing later.
# If it's all done in one pass, we wind up in a race condition where some elements are fixed and some not
tree = etree.fromstring(str.encode(processed_xhtml))
for selector in selectors:
try:
sel = lxml.cssselect.CSSSelector(selector, translator="xhtml", namespaces=se.XHTML_NAMESPACES)
except lxml.cssselect.ExpressionError:
# This gets thrown if we use pseudo-elements, which lxml doesn't support
continue
except lxml.cssselect.SelectorSyntaxError as ex:
raise se.InvalidCssException(f"Couldn't parse CSS in or near this line: {selector}\n{ex}")
# Convert <abbr> to <span>
if "abbr" in selector:
for element in tree.xpath(sel.path, namespaces=se.XHTML_NAMESPACES):
# Why would you want the tail to output by default?!?
raw_string = etree.tostring(element, encoding=str, with_tail=False)
# lxml--crap as usual--includes a bunch of namespace information in every element we print.
# Remove it here.
raw_string = raw_string.replace(" xmlns=\"http://www.w3.org/1999/xhtml\"", "")
raw_string = raw_string.replace(" xmlns:epub=\"http://www.idpf.org/2007/ops\"", "")
raw_string = raw_string.replace(" xmlns:m=\"http://www.w3.org/1998/Math/MathML\"", "")
# Now lxml doesn't let us modify the tree, so we just do a straight up regex replace to turn this into a span
processed_string = raw_string.replace("<abbr", "<span")
processed_string = processed_string.replace("</abbr", "</span")
# Now we have a nice, fixed string. But, since lxml can't replace elements, we write it ourselves.
processed_xhtml = processed_xhtml.replace(raw_string, processed_string)
tree = etree.fromstring(str.encode(processed_xhtml))
# Now we just remove all stray abbr tags that were not styled by CSS
processed_xhtml = regex.sub(r"</?abbr[^>]*?>", "", processed_xhtml)
# Remove datetime="" attribute in <time> tags, which is not always understood by epubcheck
processed_xhtml = regex.sub(r" datetime=\"[^\"]+?\"", "", processed_xhtml)
tree = etree.fromstring(str.encode(processed_xhtml))
if processed_xhtml != xhtml:
file.seek(0)
file.write("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" + etree.tostring(tree, encoding=str, pretty_print=True).replace("<html", "<html xmlns=\"http://www.w3.org/1999/xhtml\""))
file.truncate()
# Done simplifying CSS and tags!
# Extract cover and cover thumbnail
cover_svg_file = work_epub_root_directory / "epub" / "images" / "cover.svg"
if not os.path.isfile(cover_svg_file):
raise se.MissingDependencyException("Cover image is missing. Did you run build-images?")
svg2png(url=str(cover_svg_file), write_to=str(work_directory / "cover.png"))
cover = Image.open(work_directory / "cover.png")
cover = cover.convert("RGB") # Remove alpha channel from PNG if necessary
cover.save(work_epub_root_directory / "epub" / "images" / "cover.jpg")
(work_directory / "cover.png").unlink()
if build_covers:
shutil.copy2(work_epub_root_directory / "epub" / "images" / "cover.jpg", output_directory / "cover.jpg")
shutil.copy2(cover_svg_file, output_directory / "cover-thumbnail.svg")
# Path arguments must be cast to string
svg2png(url=str(output_directory / "cover-thumbnail.svg"), write_to=str(work_directory / "cover-thumbnail.png"))
cover = Image.open(work_directory / "cover-thumbnail.png")
cover = cover.resize((COVER_THUMBNAIL_WIDTH, COVER_THUMBNAIL_HEIGHT))
cover = cover.convert("RGB") # Remove alpha channel from PNG if necessary
cover.save(output_directory / "cover-thumbnail.jpg")
(work_directory / "cover-thumbnail.png").unlink()
(output_directory / "cover-thumbnail.svg").unlink()
cover_svg_file.unlink()
# Massage image references in content.opf
metadata_xhtml = metadata_xhtml.replace("cover.svg", "cover.jpg")
metadata_xhtml = metadata_xhtml.replace(".svg", ".png")
metadata_xhtml = metadata_xhtml.replace("id=\"cover.jpg\" media-type=\"image/svg+xml\"", "id=\"cover.jpg\" media-type=\"image/jpeg\"")
metadata_xhtml = metadata_xhtml.replace("image/svg+xml", "image/png")
metadata_xhtml = regex.sub(r"properties=\"([^\"]*?)svg([^\"]*?)\"", "properties=\"\\1\\2\"", metadata_xhtml) # We may also have the `mathml` property
# Add an element noting the version of the se tools that built this ebook
metadata_xhtml = regex.sub(r"<dc:publisher", f"<meta property=\"se:built-with\">{se.VERSION}</meta>\n\t\t<dc:publisher", metadata_xhtml)
# Google Play Books chokes on https XML namespace identifiers (as of at least 2017-07)
metadata_xhtml = metadata_xhtml.replace("https://standardebooks.org/vocab/1.0", "http://standardebooks.org/vocab/1.0")
# Output the modified content.opf so that we can build the kobo book before making more epub2 compatibility hacks
with open(work_epub_root_directory / "epub" / "content.opf", "w", encoding="utf-8") as file:
file.write(metadata_xhtml)
file.truncate()
# Recurse over xhtml files to make some compatibility replacements
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in filenames:
if filename.lower().endswith(".svg"):
# For night mode compatibility, give the titlepage a 1px white stroke attribute
if filename.lower() == "titlepage.svg" or filename.lower() == "logo.svg":
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
svg = file.read()
paths = svg
# What we're doing here is faking the `stroke-align: outside` property, which is an unsupported draft spec right now.
# We do this by duplicating all the SVG paths, and giving the duplicates a 2px stroke. The originals are directly on top,
# so the 2px stroke becomes a 1px stroke that's *outside* of the path instead of being *centered* on the path border.
# This looks much nicer, but we also have to increase the image size by 2px in both directions, and re-center the whole thing.
if filename.lower() == "titlepage.svg":
stroke_width = SVG_TITLEPAGE_OUTER_STROKE_WIDTH
else:
stroke_width = SVG_OUTER_STROKE_WIDTH
# First, strip out non-path, non-group elements
paths = regex.sub(r"<\?xml[^<]+?\?>", "", paths)
paths = regex.sub(r"</?svg[^<]*?>", "", paths)
paths = regex.sub(r"<title>[^<]+?</title>", "", paths)
paths = regex.sub(r"<desc>[^<]+?</desc>", "", paths)
# `paths` is now our "duplicate". Add a 2px stroke.
paths = paths.replace("<path", f"<path style=\"stroke: #ffffff; stroke-width: {stroke_width}px;\"")
# Inject the duplicate under the old SVG paths. We do this by only replacing the first regex match for <g> or <path>
svg = regex.sub(r"(<g|<path)", f"{paths}\\1", svg, 1)
# If this SVG specifies height/width, then increase height and width by 2 pixels and translate everything by 1px
try:
height = int(regex.search(r"<svg[^>]+?height=\"([0-9]+)\"", svg).group(1)) + stroke_width
svg = regex.sub(r"<svg([^<]*?)height=\"[0-9]+\"", f"<svg\\1height=\"{height}\"", svg)
width = int(regex.search(r"<svg[^>]+?width=\"([0-9]+)\"", svg).group(1)) + stroke_width
svg = regex.sub(r"<svg([^<]*?)width=\"[0-9]+\"", f"<svg\\1width=\"{width}\"", svg)
# Add a grouping element to translate everything over 1px
svg = regex.sub(r"(<g|<path)", "<g transform=\"translate({amount}, {amount})\">\n\\1".format(amount=(stroke_width / 2)), svg, 1)
svg = svg.replace("</svg>", "</g>\n</svg>")
except AttributeError:
# Thrown when the regex doesn't match (i.e. SVG doesn't specify height/width)
pass
file.seek(0)
file.write(svg)
file.truncate()
# Convert SVGs to PNGs at 2x resolution
# Path arguments must be cast to string
svg2png(url=str(Path(root) / filename), write_to=regex.sub(r"\.svg$", ".png", str(Path(root) / filename)), scale=2)
(Path(root) / filename).unlink()
if filename.lower().endswith(".xhtml"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
processed_xhtml = xhtml
# Check if there's any MathML to convert.
# We expect MathML to be the "content" type (versus the "presentational" type).
# We use an XSL transform to convert from "content" to "presentational" MathML.
# If we start with presentational, then nothing will be changed.
# Kobo supports presentational MathML. After we build kobo, we convert the presentational MathML to PNG for the rest of the builds.
mathml_transform = None
for line in regex.findall(r"<(?:m:)?math[^>]*?>(.+?)</(?:m:)?math>", processed_xhtml, flags=regex.DOTALL):
mathml_content_tree = se.easy_xml.EasyXmlTree("<?xml version=\"1.0\" encoding=\"utf-8\"?><math xmlns=\"http://www.w3.org/1998/Math/MathML\">{}</math>".format(regex.sub(r"<(/?)m:", "<\\1", line)))
# Initialize the transform object, if we haven't yet
if not mathml_transform:
with importlib_resources.path("se.data", "mathmlcontent2presentation.xsl") as mathml_xsl_filename:
mathml_transform = etree.XSLT(etree.parse(str(mathml_xsl_filename)))
# Transform the mathml and get a string representation
# XSLT comes from https://github.com/fred-wang/webextension-content-mathml-polyfill
mathml_presentation_tree = mathml_transform(mathml_content_tree.etree)
mathml_presentation_xhtml = etree.tostring(mathml_presentation_tree, encoding="unicode", pretty_print=True, with_tail=False).strip()
# Plop our string back in to the XHTML we're processing
processed_xhtml = regex.sub(r"<math[^>]*?>\{}\</math>".format(regex.escape(line)), mathml_presentation_xhtml, processed_xhtml, flags=regex.MULTILINE)
if filename == "endnotes.xhtml":
# iOS renders the left-arrow-hook character as an emoji; this fixes it and forces it to render as text.
# See https://github.com/standardebooks/tools/issues/73
# See http://mts.io/2015/04/21/unicode-symbol-render-text-emoji/
processed_xhtml = processed_xhtml.replace("\u21a9", "\u21a9\ufe0e")
# Add ARIA roles, which are just mostly duplicate attributes to epub:type
for role in se.ARIA_ROLES:
processed_xhtml = regex.sub(fr"(epub:type=\"[^\"]*?{role}[^\"]*?\")", f"\\1 role=\"doc-{role}\"", processed_xhtml)
# Some ARIA roles can't apply to some elements.
# For example, epilogue can't apply to <article>
processed_xhtml = regex.sub(r"<article ([^>]*?)role=\"doc-epilogue\"", "<article \\1", processed_xhtml)
if filename == "toc.xhtml":
landmarks_xhtml = regex.findall(r"<nav epub:type=\"landmarks\">.*?</nav>", processed_xhtml, flags=regex.DOTALL)
landmarks_xhtml = regex.sub(r" role=\"doc-.*?\"", "", landmarks_xhtml[0])
processed_xhtml = regex.sub(r"<nav epub:type=\"landmarks\">.*?</nav>", landmarks_xhtml, processed_xhtml, flags=regex.DOTALL)
# But, remove ARIA roles we added to h# tags, because tyically those roles are for sectioning content.
# For example, we might have an h2 that is both a title and dedication. But ARIA can't handle it being a dedication.
# See The Man Who Was Thursday by G K Chesterton
processed_xhtml = regex.sub(r"(<h[1-6] [^>]*) role=\".*?\">", "\\1>", processed_xhtml)
# Since we convert SVGs to raster, here we add the color-depth semantic for night mode
processed_xhtml = processed_xhtml.replace("z3998:publisher-logo", "z3998:publisher-logo se:image.color-depth.black-on-transparent")
processed_xhtml = regex.sub(r"class=\"([^\"]*?)epub-type-z3998-publisher-logo([^\"]*?)\"", "class=\"\\1epub-type-z3998-publisher-logo epub-type-se-image-color-depth-black-on-transparent\\2\"", processed_xhtml)
# Special case for the titlepage
if filename == "titlepage.xhtml":
processed_xhtml = processed_xhtml.replace("<img", "<img class=\"epub-type-se-image-color-depth-black-on-transparent\" epub:type=\"se:image.color-depth.black-on-transparent\"")
# Google Play Books chokes on https XML namespace identifiers (as of at least 2017-07)
processed_xhtml = processed_xhtml.replace("https://standardebooks.org/vocab/1.0", "http://standardebooks.org/vocab/1.0")
# We converted svgs to pngs, so replace references
processed_xhtml = processed_xhtml.replace("cover.svg", "cover.jpg")
processed_xhtml = processed_xhtml.replace(".svg", ".png")
# To get popup footnotes in iBooks, we have to change epub:endnote to epub:footnote.
# Remember to get our custom style selectors too.
processed_xhtml = regex.sub(r"epub:type=\"([^\"]*?)endnote([^\"]*?)\"", "epub:type=\"\\1footnote\\2\"", processed_xhtml)
processed_xhtml = regex.sub(r"class=\"([^\"]*?)epub-type-endnote([^\"]*?)\"", "class=\"\\1epub-type-footnote\\2\"", processed_xhtml)
# Include extra lang tag for accessibility compatibility.
processed_xhtml = regex.sub(r"xml:lang\=\"([^\"]+?)\"", "lang=\"\\1\" xml:lang=\"\\1\"", processed_xhtml)
# Typography: replace double and triple em dash characters with extra em dashes.
processed_xhtml = processed_xhtml.replace("⸺", f"—{se.WORD_JOINER}—")
processed_xhtml = processed_xhtml.replace("⸻", f"—{se.WORD_JOINER}—{se.WORD_JOINER}—")
# Typography: replace some other less common characters.
processed_xhtml = processed_xhtml.replace("⅒", "1/10")
processed_xhtml = processed_xhtml.replace("℅", "c/o")
processed_xhtml = processed_xhtml.replace("✗", "×")
processed_xhtml = processed_xhtml.replace(" ", f"{se.NO_BREAK_SPACE}{se.NO_BREAK_SPACE}") # em-space to two nbsps
# Many e-readers don't support the word joiner character (U+2060).
# They DO, however, support the now-deprecated zero-width non-breaking space (U+FEFF)
# For epubs, do this replacement. Kindle now seems to handle everything fortunately.
processed_xhtml = processed_xhtml.replace(se.WORD_JOINER, se.ZERO_WIDTH_SPACE)
# Some minor code style cleanup
processed_xhtml = processed_xhtml.replace(" >", ">")
if processed_xhtml != xhtml:
file.seek(0)
file.write(processed_xhtml)
file.truncate()
if filename.lower().endswith(".css"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
css = file.read()
processed_css = css
# To get popup footnotes in iBooks, we have to change epub:endnote to epub:footnote.
# Remember to get our custom style selectors too.
processed_css = processed_css.replace("endnote", "footnote")
# Add new break-* aliases for compatibilty with newer readers.
processed_css = regex.sub(r"(\s+)page-break-(.+?:\s.+?;)", "\\1page-break-\\2\t\\1break-\\2", processed_css)
if processed_css != css:
file.seek(0)
file.write(processed_css)
file.truncate()
if build_kobo:
with tempfile.TemporaryDirectory() as temp_directory:
kobo_work_directory = Path(temp_directory)
copy_tree(str(work_epub_root_directory), str(kobo_work_directory))
for root, _, filenames in os.walk(kobo_work_directory):
# Add a note to content.opf indicating this is a transform build
for filename in fnmatch.filter(filenames, "content.opf"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
xhtml = regex.sub(r"<dc:publisher", "<meta property=\"se:transform\">kobo</meta>\n\t\t<dc:publisher", xhtml)
file.seek(0)
file.write(xhtml)
file.truncate()
# Kobo .kepub files need each clause wrapped in a special <span> tag to enable highlighting.
# Do this here. Hopefully Kobo will get their act together soon and drop this requirement.
for filename in fnmatch.filter(filenames, "*.xhtml"):
kobo.paragraph_counter = 1
kobo.segment_counter = 1
# Don't add spans to the ToC
if filename == "toc.xhtml":
continue
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
# Kobos don't have fonts that support the ↩ character in endnotes, so replace it with «
if filename == "endnotes.xhtml":
# Note that we replaced ↩ with \u21a9\ufe0e in an earlier iOS compatibility fix
xhtml = regex.sub(r"epub:type=\"backlink\">\u21a9\ufe0e</a>", "epub:type=\"backlink\">«</a>", xhtml)
# We have to remove the default namespace declaration from our document, otherwise
# xpath won't find anything at all. See http://stackoverflow.com/questions/297239/why-doesnt-xpath-work-when-processing-an-xhtml-document-with-lxml-in-python
try:
tree = etree.fromstring(str.encode(xhtml.replace(" xmlns=\"http://www.w3.org/1999/xhtml\"", "")))
except Exception as ex:
raise se.InvalidXhtmlException(f"Error parsing XHTML file: {filename}\n{ex}", verbose)
kobo.add_kobo_spans_to_node(tree.xpath("./body", namespaces=se.XHTML_NAMESPACES)[0])
xhtml = etree.tostring(tree, encoding="unicode", pretty_print=True, with_tail=False)
xhtml = regex.sub(r"<html:span", "<span", xhtml)
xhtml = regex.sub(r"html:span>", "span>", xhtml)
xhtml = regex.sub(r"<span xmlns:html=\"http://www.w3.org/1999/xhtml\"", "<span", xhtml)
xhtml = regex.sub(r"<html", "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<html xmlns=\"http://www.w3.org/1999/xhtml\"", xhtml)
file.seek(0)
file.write(xhtml)
file.truncate()
se.epub.write_epub(kobo_work_directory, output_directory / kobo_output_filename)
if verbose:
print(" OK")
print(f"\tBuilding {epub_output_filename} ...", end="", flush=True)
# Now work on more epub2 compatibility
# Recurse over css files to make some compatibility replacements.
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in filenames:
if filename.lower().endswith(".css"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
css = file.read()
processed_css = css
processed_css = regex.sub(r"(page\-break\-(before|after|inside)\s*:\s*(.+))", "\\1\n\t-webkit-column-break-\\2: \\3 /* For Readium */", processed_css)
processed_css = regex.sub(r"^\s*hyphens\s*:\s*(.+)", "\thyphens: \\1\n\tadobe-hyphenate: \\1\n\t-webkit-hyphens: \\1\n\t-epub-hyphens: \\1\n\t-moz-hyphens: \\1", processed_css, flags=regex.MULTILINE)
processed_css = regex.sub(r"^\s*hyphens\s*:\s*none;", "\thyphens: none;\n\tadobe-text-layout: optimizeSpeed; /* For Nook */", processed_css, flags=regex.MULTILINE)
if processed_css != css:
file.seek(0)
file.write(processed_css)
file.truncate()
# Sort out MathML compatibility
has_mathml = "mathml" in metadata_xhtml
if has_mathml:
# We import this late because we don't want to load selenium if we're not going to use it!
from se import browser # pylint: disable=import-outside-toplevel
driver = browser.initialize_selenium_firefox_webdriver()
mathml_count = 1
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in filenames:
if filename.lower().endswith(".xhtml"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
processed_xhtml = xhtml
replaced_mathml: List[str] = []
# Check if there's MathML we want to convert
# We take a naive approach and use some regexes to try to simplify simple MathML expressions.
# For each MathML expression, if our round of regexes finishes and there is still MathML in the processed result, we abandon the attempt and render to PNG using Firefox.
for line in regex.findall(r"<(?:m:)math[^>]*?>(?:.+?)</(?:m:)math>", processed_xhtml, flags=regex.DOTALL):
if line not in replaced_mathml:
replaced_mathml.append(line) # Store converted lines to save time in case we have multiple instances of the same MathML
mathml_tree = se.easy_xml.EasyXmlTree("<?xml version=\"1.0\" encoding=\"utf-8\"?>{}".format(regex.sub(r"<(/?)m:", "<\\1", line)))
processed_line = line
# If the mfenced element has more than one child, they are separated by commas when rendered.
# This is too complex for our naive regexes to work around. So, if there is an mfenced element with more than one child, abandon the attempt.
if not mathml_tree.css_select("mfenced > * + *"):
processed_line = regex.sub(r"</?(?:m:)?math[^>]*?>", "", processed_line)
processed_line = regex.sub(r"<!--.+?-->", "", processed_line)
processed_line = regex.sub(r"<(?:m:)?mfenced/>", "()", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mi)>(.+?)</\3><((?:m:)?mi)>(.+?)</\5></\1>", "<i>\\4</i><\\2><i>\\6</i></\\2>", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mi)>(.+?)</\3><((?:m:)?mn)>(.+?)</\5></\1>", "<i>\\4</i><\\2>\\6</\\2>", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mn)>(.+?)</\3><((?:m:)?mn)>(.+?)</\5></\1>", "\\4<\\2>\\6</\\2>", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mn)>(.+?)</\3><((?:m:)?mi)>(.+?)</\5></\1>", "\\4<\\2><i>\\6</i></\\2>", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mi) mathvariant=\"normal\">(.+?)</\3><((?:m:)?mi)>(.+?)</\5></\1>", "\\4<\\2><i>\\6</i></\\2>", processed_line)
processed_line = regex.sub(r"<((?:m:)?m(sub|sup))><((?:m:)?mi) mathvariant=\"normal\">(.+?)</\3><((?:m:)?mn)>(.+?)</\5></\1>", "\\4<\\2>\\6</\\2>", processed_line)
processed_line = regex.sub(fr"<(?:m:)?mo>{se.FUNCTION_APPLICATION}</(?:m:)?mo>", "", processed_line, flags=regex.IGNORECASE) # The ignore case flag is required to match here with the special FUNCTION_APPLICATION character, it's unclear why
processed_line = regex.sub(r"<(?:m:)?mfenced><((?:m:)(?:mo|mi|mn|mrow))>(.+?)</\1></(?:m:)?mfenced>", "(<\\1>\\2</\\1>)", processed_line)
processed_line = regex.sub(r"<(?:m:)?mrow>([^>].+?)</(?:m:)?mrow>", "\\1", processed_line)
processed_line = regex.sub(r"<(?:m:)?mi>([^<]+?)</(?:m:)?mi>", "<i>\\1</i>", processed_line)
processed_line = regex.sub(r"<(?:m:)?mi mathvariant=\"normal\">([^<]+?)</(?:m:)?mi>", "\\1", processed_line)
processed_line = regex.sub(r"<(?:m:)?mo>([+\-−=×])</(?:m:)?mo>", " \\1 ", processed_line)
processed_line = regex.sub(r"<((?:m:)?m[no])>(.+?)</\1>", "\\2", processed_line)
processed_line = regex.sub(r"</?(?:m:)?mrow>", "", processed_line)
processed_line = processed_line.strip()
processed_line = regex.sub(r"</i><i>", "", processed_line, flags=regex.DOTALL)
# Did we succeed? Is there any more MathML in our string?
if regex.findall("</?(?:m:)?m", processed_line):
# Failure! Abandon all hope, and use Firefox to convert the MathML to PNG.
se.images.render_mathml_to_png(driver, regex.sub(r"<(/?)m:", "<\\1", line), work_epub_root_directory / "epub" / "images" / f"mathml-{mathml_count}.png")
processed_xhtml = processed_xhtml.replace(line, f"<img class=\"mathml epub-type-se-image-color-depth-black-on-transparent\" epub:type=\"se:image.color-depth.black-on-transparent\" src=\"../images/mathml-{mathml_count}.png\" />")
mathml_count = mathml_count + 1
else:
# Success! Replace the MathML with our new string.
processed_xhtml = processed_xhtml.replace(line, processed_line)
if processed_xhtml != xhtml:
file.seek(0)
file.write(processed_xhtml)
file.truncate()
# Include epub2 cover metadata
cover_id = metadata_tree.xpath("//opf:item[@properties=\"cover-image\"]/@id")[0].replace(".svg", ".jpg")
metadata_xhtml = regex.sub(r"(<metadata[^>]+?>)", f"\\1\n\t\t<meta content=\"{cover_id}\" name=\"cover\" />", metadata_xhtml)
# Add metadata to content.opf indicating this file is a Standard Ebooks compatibility build
metadata_xhtml = metadata_xhtml.replace("<dc:publisher", "<meta property=\"se:transform\">compatibility</meta>\n\t\t<dc:publisher")
# Add any new MathML images we generated to the manifest
if has_mathml:
for root, _, filenames in os.walk(work_epub_root_directory / "epub" / "images"):
filenames = se.natural_sort(filenames)
filenames.reverse()
for filename in filenames:
if filename.lower().startswith("mathml-"):
metadata_xhtml = metadata_xhtml.replace("<manifest>", "<manifest><item href=\"images/{0}\" id=\"{0}\" media-type=\"image/png\"/>".format(filename))
metadata_xhtml = regex.sub(r"properties=\"([^\"]*?)mathml([^\"]*?)\"", "properties=\"\\1\\2\"", metadata_xhtml)
metadata_xhtml = regex.sub(r"properties=\"\s*\"", "", metadata_xhtml)
# Generate our NCX file for epub2 compatibility.
# First find the ToC file.
toc_filename = metadata_tree.xpath("//opf:item[@properties=\"nav\"]/@href")[0]
metadata_xhtml = metadata_xhtml.replace("<spine>", "<spine toc=\"ncx\">")
metadata_xhtml = metadata_xhtml.replace("<manifest>", "<manifest><item href=\"toc.ncx\" id=\"ncx\" media-type=\"application/x-dtbncx+xml\" />")
# Now use an XSLT transform to generate the NCX
with importlib_resources.path("se.data", "navdoc2ncx.xsl") as navdoc2ncx_xsl_filename:
toc_tree = se.epub.convert_toc_to_ncx(work_epub_root_directory, toc_filename, navdoc2ncx_xsl_filename)
# Convert the <nav> landmarks element to the <guide> element in content.opf
guide_xhtml = "<guide>"
for element in toc_tree.xpath("//xhtml:nav[@epub:type=\"landmarks\"]/xhtml:ol/xhtml:li/xhtml:a"):
element_xhtml = element.tostring()
element_xhtml = regex.sub(r"epub:type=\"([^\"]*)(\s*frontmatter\s*|\s*backmatter\s*)([^\"]*)\"", "type=\"\\1\\3\"", element_xhtml)
element_xhtml = regex.sub(r"epub:type=\"[^\"]*(acknowledgements|bibliography|colophon|copyright-page|cover|dedication|epigraph|foreword|glossary|index|loi|lot|notes|preface|bodymatter|titlepage|toc)[^\"]*\"", "type=\"\\1\"", element_xhtml)
element_xhtml = element_xhtml.replace("type=\"copyright-page", "type=\"copyright page")
# We add the 'text' attribute to the titlepage to tell the reader to start there
element_xhtml = element_xhtml.replace("type=\"titlepage", "type=\"title-page text")
element_xhtml = regex.sub(r"type=\"\s*\"", "", element_xhtml)
element_xhtml = element_xhtml.replace("<a", "<reference")
element_xhtml = regex.sub(r">(.+)</a>", " title=\"\\1\" />", element_xhtml)
# Replace instances of the `role` attribute since it's illegal in content.opf
element_xhtml = regex.sub(r" role=\".*?\"", "", element_xhtml)
guide_xhtml = guide_xhtml + element_xhtml
guide_xhtml = guide_xhtml + "</guide>"
metadata_xhtml = metadata_xhtml.replace("</package>", "") + guide_xhtml + "</package>"
# Guide is done, now write content.opf and clean it.
# Output the modified content.opf before making more epub2 compatibility hacks.
with open(work_epub_root_directory / "epub" / "content.opf", "w", encoding="utf-8") as file:
file.write(metadata_xhtml)
file.truncate()
# All done, clean the output
for filepath in se.get_target_filenames([work_epub_root_directory], (".xhtml", ".svg", ".opf", ".ncx")):
se.formatting.format_xhtml_file(filepath, False, filepath.name == "content.opf", filepath.name == "endnotes.xhtml", filepath.name == "colophon.xhtml")
# Write the compatible epub
se.epub.write_epub(work_epub_root_directory, output_directory / epub_output_filename)
if verbose:
print(" OK")
if run_epubcheck:
if verbose:
print(f"\tRunning epubcheck on {epub_output_filename} ...", end="", flush=True)
# Path arguments must be cast to string for Windows compatibility.
with importlib_resources.path("se.data.epubcheck", "epubcheck.jar") as jar_path:
output = subprocess.run(["java", "-jar", str(jar_path), "--quiet", str(output_directory / epub_output_filename)], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=False).stdout.decode().strip()
if output:
# Get the epubcheck version to print to the console
version_output = subprocess.run(["java", "-jar", str(jar_path), "--version"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=False).stdout.decode().strip()
version = regex.search(r"[0-9]+\.([0-9]+\.?)*", version_output, flags=regex.MULTILINE).group(0)
# Remove trailing lines from epubcheck output
output = output.replace("\n\nCheck finished with errors", "")
if verbose:
print(f"\n\t\tepubcheck v{version} failed with:\n\t\t" + "\t\t".join(output.splitlines(True)), file=sys.stderr)
else:
print(f"epubcheck v{version} failed with:\n{output}", file=sys.stderr)
return
if verbose:
print(" OK")
if build_kindle:
if verbose:
print(f"\tBuilding {kindle_output_filename} ...", end="", flush=True)
# There's a bug in Calibre <= 3.48.0 where authors who have more than one MARC relator role
# display as "unknown author" in the Kindle interface.
# See: https://bugs.launchpad.net/calibre/+bug/1844578
# Until the bug is fixed, we simply remove any other MARC relator on the dc:creator element.
# Once the bug is fixed, we can remove this block.
with open(work_epub_root_directory / "epub" / "content.opf", "r+", encoding="utf-8") as file:
xhtml = file.read()
processed_xhtml = xhtml
for match in regex.findall(r"<meta property=\"role\" refines=\"#author\" scheme=\"marc:relators\">.*?</meta>", xhtml):
if ">aut<" not in match:
processed_xhtml = processed_xhtml.replace(match, "")
if processed_xhtml != xhtml:
file.seek(0)
file.write(processed_xhtml)
file.truncate()
# Kindle doesn't go more than 2 levels deep for ToC, so flatten it here.
with open(work_epub_root_directory / "epub" / toc_filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
soup = BeautifulSoup(xhtml, "lxml")
for match in soup.select("ol > li > ol > li > ol"):
match.parent.insert_after(match)
match.unwrap()
file.seek(0)
file.write(str(soup))
file.truncate()
# Rebuild the NCX
with importlib_resources.path("se.data", "navdoc2ncx.xsl") as navdoc2ncx_xsl_filename:
toc_tree = se.epub.convert_toc_to_ncx(work_epub_root_directory, toc_filename, navdoc2ncx_xsl_filename)
# Clean just the ToC and NCX
for filepath in [work_epub_root_directory / "epub" / "toc.ncx", work_epub_root_directory / "epub" / toc_filename]:
se.formatting.format_xhtml_file(filepath, False)
# Convert endnotes to Kindle popup compatible notes
if (work_epub_root_directory / "epub" / "text" / "endnotes.xhtml").is_file():
with open(work_epub_root_directory / "epub" / "text" / "endnotes.xhtml", "r+", encoding="utf-8") as file:
xhtml = file.read()
# We have to remove the default namespace declaration from our document, otherwise
# xpath won't find anything at all. See http://stackoverflow.com/questions/297239/why-doesnt-xpath-work-when-processing-an-xhtml-document-with-lxml-in-python
try:
tree = etree.fromstring(str.encode(xhtml.replace(" xmlns=\"http://www.w3.org/1999/xhtml\"", "")))
except Exception as ex:
raise se.InvalidXhtmlException(f"Error parsing XHTML file: endnotes.xhtml\n{ex}")
notes = tree.xpath("//li[@epub:type=\"endnote\" or @epub:type=\"footnote\"]", namespaces=se.XHTML_NAMESPACES)
processed_endnotes = ""
for note in notes:
note_id = note.get("id")
note_number = note_id.replace("note-", "")
# First, fixup the reference link for this endnote
try:
ref_link = etree.tostring(note.xpath("p[last()]/a[last()]")[0], encoding="unicode", pretty_print=True, with_tail=False).replace(" xmlns:epub=\"http://www.idpf.org/2007/ops\"", "").strip()
except Exception:
raise se.InvalidXhtmlException(f"Can’t find ref link for #{note_id}.")
new_ref_link = regex.sub(r">.*?</a>", ">" + note_number + "</a>.", ref_link)
# Now remove the wrapping li node from the note
note_text = regex.sub(r"^<li[^>]*?>(.*)</li>$", r"\1", etree.tostring(note, encoding="unicode", pretty_print=True, with_tail=False), flags=regex.IGNORECASE | regex.DOTALL)
# Insert our new ref link
result = regex.subn(r"^\s*<p([^>]*?)>", "<p\\1 id=\"" + note_id + "\">" + new_ref_link + " ", note_text)
# Sometimes there is no leading <p> tag (for example, if the endnote starts with a blockquote
# If that's the case, just insert one in front.
note_text = result[0]
if result[1] == 0:
note_text = "<p id=\"" + note_id + "\">" + new_ref_link + "</p>" + note_text
# Now remove the old ref_link
note_text = note_text.replace(ref_link, "")
# Trim trailing spaces left over after removing the ref link
note_text = regex.sub(r"\s+</p>", "</p>", note_text).strip()
# Sometimes ref links are in their own p tag--remove that too
note_text = regex.sub(r"<p>\s*</p>", "", note_text)
processed_endnotes += note_text + "\n"
# All done with endnotes, so drop them back in
xhtml = regex.sub(r"<ol>.*</ol>", processed_endnotes, xhtml, flags=regex.IGNORECASE | regex.DOTALL)
file.seek(0)
file.write(xhtml)
file.truncate()
# While Kindle now supports soft hyphens, popup endnotes break words but don't insert the hyphen characters. So for now, remove soft hyphens from the endnotes file.
with open(work_epub_root_directory / "epub" / "text" / "endnotes.xhtml", "r+", encoding="utf-8") as file:
xhtml = file.read()
processed_xhtml = xhtml
processed_xhtml = processed_xhtml.replace(se.SHY_HYPHEN, "")
if processed_xhtml != xhtml:
file.seek(0)
file.write(processed_xhtml)
file.truncate()
# Do some compatibility replacements
for root, _, filenames in os.walk(work_epub_root_directory):
for filename in filenames:
if filename.lower().endswith(".xhtml"):
with open(Path(root) / filename, "r+", encoding="utf-8") as file:
xhtml = file.read()
processed_xhtml = xhtml
# Kindle doesn't recognize most zero-width spaces or word joiners, so just remove them.
# It does recognize the word joiner character, but only in the old mobi7 format. The new format renders them as spaces.
processed_xhtml = processed_xhtml.replace(se.ZERO_WIDTH_SPACE, "")
# Remove the epub:type attribute, as Calibre turns it into just "type"
processed_xhtml = regex.sub(r"epub:type=\"[^\"]*?\"", "", processed_xhtml)
if processed_xhtml != xhtml:
file.seek(0)
file.write(processed_xhtml)
file.truncate()
# Include compatibility CSS
with open(work_epub_root_directory / "epub" / "css" / "core.css", "a", encoding="utf-8") as core_css_file:
with importlib_resources.open_text("se.data.templates", "kindle.css", encoding="utf-8") as compatibility_css_file:
core_css_file.write(compatibility_css_file.read())
# Add soft hyphens
for filepath in se.get_target_filenames([work_epub_root_directory], (".xhtml",)):
se.typography.hyphenate_file(filepath, None, True)
# Build an epub file we can send to Calibre
se.epub.write_epub(work_epub_root_directory, work_directory / epub_output_filename)
# Generate the Kindle file
# We place it in the work directory because later we have to update the asin, and the mobi.update_asin() function will write to the final output directory
cover_path = work_epub_root_directory / "epub" / metadata_tree.xpath("//opf:item[@properties=\"cover-image\"]/@href")[0].replace(".svg", ".jpg")
# Path arguments must be cast to string for Windows compatibility.
return_code = subprocess.run([str(ebook_convert_path), str(work_directory / epub_output_filename), str(work_directory / kindle_output_filename), "--pretty-print", "--no-inline-toc", "--max-toc-links=0", "--prefer-metadata-cover", f"--cover={cover_path}"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, check=False).returncode
if return_code:
raise se.InvalidSeEbookException("ebook-convert failed.")
# Success, extract the Kindle cover thumbnail
# Update the ASIN in the generated file
mobi.update_asin(asin, work_directory / kindle_output_filename, output_directory / kindle_output_filename)
# Extract the thumbnail
kindle_cover_thumbnail = Image.open(work_epub_root_directory / "epub" / "images" / "cover.jpg")
kindle_cover_thumbnail = kindle_cover_thumbnail.convert("RGB") # Remove alpha channel from PNG if necessary
kindle_cover_thumbnail = kindle_cover_thumbnail.resize((432, 648))
kindle_cover_thumbnail.save(output_directory / f"thumbnail_{asin}_EBOK_portrait.jpg")
if verbose:
print(" OK")
def parse_rules(css: str):
"""
Apply a CSS stylesheet to an XHTML tree.
The application is naive and should not be expected to be browser-grade.
CSS declarationerties on specific elements can be returned using EasyXmlElement.get_css_declarationerty()
For example,
for node in dom.xpath("//em")"
print(node.get_css_declarationerty("font-style"))
"""
rules = []
# Parse the stylesheet to break it into rules and their associated declarationerties
for token in tinycss2.parse_stylesheet(css, skip_comments=True):
if token.type == "error":
raise se.InvalidCssException(token.message)
# A CSS rule
if token.type == "qualified-rule":
selectors = tinycss2.serialize(token.prelude).strip()
# First, get a list of declarations within the { } block.
# Parse each declaration and add it to the rule
declarations = []
for item in tinycss2.parse_declaration_list(token.content):
if item.type == "error":
raise se.InvalidCssException(
"Couldn’t parse CSS. Exception: {token.message}")
if item.type == "declaration":
declaration = CssDeclaration(item.lower_name, item.value,
item.important)
declarations += declaration.expand()
# We can have multiple selectors in a rule separated by `,`
for selector in selectors.split(","):
# Skip selectors containing pseudo elements
if "::" in selector:
continue
selector = selector.strip()
rule = CssRule(selector)
# Calculate the specificity of the selector
# See https://www.w3.org/TR/CSS2/cascade.html#specificity
# a = 0 always (no style attributes apply here)
# First remove strings, because they can contain `:`
selector = regex.sub(r"\"[^\"]+?\"", "", selector)
# b = number of ID attributes
specificity_b = len(regex.findall(r"#", selector))
# c = number of other attributes or pseudo classes
specificity_c = len(regex.findall(r"[\.\[\:]", selector))
# d = number of element names and pseudo elements (which will be 0 for us)
specificity_d = len(
regex.findall(r"(?:^[a-z]|\s[a-z])", selector))
rule.specificity = (specificity_b, specificity_c,
specificity_d)
rule.specificity_number = specificity_b * 100 + specificity_c * 10 + specificity_d
# Done with specificity, assign the declarations and save the rule
rule.declarations = declarations
rules.append(rule)
return rules
