23 KiB
Changelog
This document contains details of the various releases and their release dates.
Dates are in the format yyyy-mm-dd
.
1.0.3 - 2015-06-16
Strict XML parsing support
Oga can now parse XML documents in "strict mode". This mode currently only disables the automatic insertion of missing closing tags. This feature can be used as following:
document = Oga.parse_xml('<foo>bar</foo>', :strict => true)
This works for all 3 (DOM, SAX and pull) parsing APIs.
See commit 2c18a51ba9
for more information.
Support for HTML attribute values without starting quotes
Oga can now parse HTML such as <foo bar=baz" />
. This will be parsed as if the
input were <foo bar='baz"' />
.
See commit fd307a0fcc
for more information.
Support for spaces around attribute equal signs
Previously XML/HTML such as <foo bar = "baz" />
would not be parsed correctly
as Oga didn't support spaces around the =
sign. Commit
a76286b973
added support for input like this.
Decoding entities with numbers
Oga can now decode entities such as ½
. Due to an incorrect regular
expression these entities would not be decoded.
See commit af7f2674af
for more information.
1.0.2 - 2015-06-03
Fix for requiring extensions on certain platforms
The loading of files has been changed to use require
so that native extensions
are loaded properly even when a platform decides not to store in in the lib
directory.
See commit 4bfeea2590
for more information.
Better closing of HTML tags
Closing of HTML tags has been improved so Oga can parse HTML such as this:
<div>
<ul>
<li>foo
</ul>
inside div
</div>
outside div
See the following commits for more information:
Whitespace support in closing tags
Oga can now lex HTML/XML such as the following:
<p>hello<p
>
See commit d2523a1082
for more information.
1.0.1 - 2015-05-21
Encoding quotes in XML
Oga no longer encodes single/double quotes as XML entities when serializing a
document back to XML. This ensures that input such as <foo>a"b</foo>
doesn't
get turned into <foo>a"b</foo>
.
HTML Entity Encoding
HTML entities are now generated using pack('U*')
instead of pack('U')
ensuring the correct characters/codepoints are produced.
1.0.0 - 2015-05-20
This marks the first stable release (API wise) for Oga. It's been quite the ride since the very first commit from February 26, 2014. In the releases following 1.0 I plan to focus mainly on performance as both XMl/HTML parsing and XPath evaluation performance is not quite as fast as I'd like it to be.
License Change
Up until 1.0.0 Oga was licensed under the MIT license. Since this license does
fairly little to protect authors (especially regarding patents) I've decided to
change the license to the Mozilla Public License 2.0. More information on this
can be found in commit 0a7242aed4
.
XPath Performance Improvements
With 1.0 the evaluator received further performance improvements that should be especially noticable when querying large XML/HTML documents. Improving XPath performance is an ongoing task so expect similar improvements in upcoming releases.
See the following commits for more information:
Full HTML5 Support
With 1.0 Oga finally supports parsing of HTML5 according to the official specification. This means that Oga is now capable of parsing HTML such as the following:
<p>Hello, this is a list:</p>
<ul>
<li>First item
</li>Second item
</ul>
This would be parsed as if the HTML were as following instead:
<p>Hello, this is a list:</p>
<ul>
<li>First item</li>
</li>Second item</li>
</ul>
See the following commits for more information:
The following issues are also worth checking out:
Handling of invalid XML/HTML
Oga can now handle most forms of invalid XML/HTML by automatically inserting missing closing tags and ignoring stray opening tags where possible. This allows Oga to parse XML such as the following:
<root>
<person>
<name>Alice</name>
</person>
See commit 13e2c3d82f
for more information.
Decoding zero padded XML/HTML entities
Oga can now decode zero padded XML/HTML entities such as &
. See commit
853d804f34
for more information.
0.3.4 - 2015-04-19
XML and HTML entities are decoded in the SAX parser before data is passed to a custom handler class.
See commit da62fcd75d
for more information.
0.3.3 - 2015-04-18
Improved lexer support for script/style tags
Commit 73fbbfbdbd
improved support for lexing
HTML script and style tags, ensuring that HTML such as the following is
processed correctly:
<script>
var foo = "</style>"
</script>
<style>
/* </script> */
</style>
Lexing of extra quotes
The XML lexer can now handle stray quotes that reside in the open tag of an element, for example:
<a href="foo""></a>
While technically invalid HTML certain websites such as http://yahoo.com contain HTML like this.
See commit 6b779d7883
for more information.
Lexing of doctypes containing newlines
The XML lexer is now capable of lexing doctypes that contain newlines such as:
<!DOCTYPE
html>
See commit 9a0e31d0ae
for more information.
0.3.2 - 2015-04-15
Support for unquoted HTML attribute values
Oga can now lex/parse HTML attribute values that don't use quotes. For example, the following is valid HTML:
<a href=foo>Foo</a>
And so is this:
<a href=foo/bar>Foo/bar</a>
See Github issue https://github.com/YorickPeterse/oga/issues/94 and the following commits for more information:
Counting newlines in XML declarations
The XML lexer has been adjusted so that it counts newlines when processing
XML declarations. While these newlines are not exposed to the resulting
Oga::XML::*
instances they are used when reporting errors. Previously the
lexer wouldn't count newlines in XML declarations, leading to error messages
referring to incorrect line numbers.
This was fixed in commit e942086f2d
.
Better lexer support for CDATA, comments and processing instructions
The XML lexer has been tweaked so it can handle multi-line CDATA tags, comments and processing instructions, both when using a String and IO (or similar) as input.
See Github issue https://github.com/YorickPeterse/oga/issues/93 and the following commits for more information:
Performance Improvements
To improve performance of the XPath evaluator (as well as generic code using Oga) the following methods now cache their return values:
Oga::XML::Element#available_namespaces
Oga::XML::Element#namespace
Oga::XML::Node#html?
These cache of these methods is flushed automatically when needed. For example,
registering a new namespace will flush the cache for
Element#available_namespaces
and Element#namespace
.
The performance of Oga::XML::Traversal#each_node
has also been optimized,
cutting down the amount of object allocations significantly.
Combined these improvements should make XPath evaluation roughly 4 times faster.
See the following commits for more information:
0.3.1 - 2015-04-08
Oga no longer decodes any HTML entities that appear inside the body of a
<script>
or <style>
tag. For example, this HTML:
<script>foo&bar;</script>
Would effectively be turned into:
<script>foo</script>
See commit 4bdc8a3fdc
for more information.
0.3.0 - 2015-04-03
Lexing of carriage returns
Oga can now lex and parse XML documents using carriage returns for newlines.
This was added in commit 0800654c96
.
Improved handling of HTML namespaces
Oga now ignores any declared namespaces when parsing HTML documents as HTML5 does not allow one to register custom namespaces.
See commit 3176459307
for more information.
Improved handling of explicitly declared default XML namespaces
In the past explicitly defining the default XML namespace in a document would
lead to Oga's XPath evaluator not being able to match any nodes. This has been
fixed in commit 5adeae18d0
.
Caching of XPath/CSS expressions
The CSS and XPath parsers now cache the ASTs of an expression used when querying a document using CSS or XPath. This can give a pretty noticable speed improvement, especially when running the same expression in a loop (or just many different times).
Parsed expressions are stored in an LRU to prevent memory from growing forever. Currently the capacity is set to 1024 values but this can be changed as following:
Oga::XPath::Parser::CACHE.maximum = 2048
Oga::CSS::Parser::CACHE.maximum = 2048
The LRU synchronizes method calls to allow safe usage from multiple threads.
See the following commits for more info:
Windows support
While Oga for the most part already supported Windows a few changes for the extension compilation process were required to allow users to install Oga on Windows. Tests are run on AppVeyor (a continuous integration service for Windows platforms).
Oga requires devkit (http://rubyinstaller.org/add-ons/devkit/) to be installed on non Cygwin/MinGW environments. Cygwin/MinGW environments probably already work, although I do not run any tests on these environments.
SAX parsing of XML attributes
Parsing of XML attributes using the SAX API was overhauled quite a bit. As these changes are not backwards compatible it's likely that existing SAX parsers will break.
See commit d8b9725b82
for more information.
Parser callbacks for XML attributes
The XML parser has an extra callback method called on_attribute
which is used
to create a new attribute. This callback can be used in custom SAX parsers just
like the other callbacks.
Parser rewritten using ruby-ll
The XML, CSS and XPath parsers have been re-written using ruby-ll (https://github.com/yorickpeterse/ruby-ll). While Racc served its purpose (until now) it has three main problems:
- Performance is not as good as it should be.
- The codebase is dated and generally hard to deal with, as such it's quite difficult to optimize in reasonable time.
- LALR parser errors can be incredibly painful to debug.
For this reason I wrote ruby-ll and replaced Oga's Racc based parsers with ruby-ll parsers. These parsers are LL(1) parsers which makes them a lot easier to debug. Performance is currently a tiny bit faster than the old Racc parsers, but this will be improved in the coming releases of both Oga and ruby-ll.
See pull request https://github.com/YorickPeterse/oga/pull/78 for more information.
Lazy decoding of XML/HTML entities
In the past XML/HTML entities were decoded in the lexer, adding overhead even
when not needed. This has been changed so that the decoding of entities only
occurs when calling XML::Text#text
. With this particular change also comes
support for HTML entities and codepoint based XML/HTML entities.
See commit 2ec91f130f
for more information.
0.2.3 - 2015-03-04
This release adds support for lexing HTML <style>
tags similar to how
<script>
tags are handled. This ensures that the contents of these tags are
treated as-is without any HTML entity conversion being applied.
See commits 78e40b55c0
and
3b2055a30b
for more information.
0.2.2 - 2015-03-03
This release fixes a bug where setting the text of an element using
Oga::XML::Element#inner_text=
would not set the parent element of the newly
created text node. This would result in the following:
some_element.inner_text = 'foo'
some_element.children[0].parent # => nil
Here parent
is supposed to return some_element
instead. See commit
142b467277
for more information.
0.2.1 - 2015-03-02
Proper HTML serializing support for script tags
When serializing an HTML document back to HTML (as a String) the contents of
<script>
tags are serialized correctly. Previously XML unsafe characters
(e.g. <
) would be converted to XML entities, which results in invalid
Javascript syntax. This has been changed so that <script>
tags in HTML
documents don't have their contents converted, ensuring proper Javascript
syntax upon output.
See commit 874d7124af
and issue
https://github.com/YorickPeterse/oga/issues/79 for more information.
Proper lexing support for script tags
When lexing HTML documents the XML lexer is now capable of lexing the contents
of <script>
tags properly. Previously input such as <script>x >y</script>
would result in incorrect tokens being emitted. See commit
ba2177e2cf
and issue
https://github.com/YorickPeterse/oga/issues/70 for more information.
Element Inner Text
When setting the inner text of an element using Oga::XML::Element#inner_text=
all child nodes of the element are now removed first, instead of only text
nodes being removed.
See https://github.com/YorickPeterse/oga/issues/64 for more information.
Support for extra XML entities
Support for encoding/decoding extra XML entities was added by Dmitry
Krasnoukhov. This includes entities such as <
, "
, etc. See commit
26baf89440
for more information.
Support for inline doctypes with newlines in IO input
The XML lexer (and thus the parser) can now handle inline doctypes containing newlines when using an IO object as the input. For example:
<!DOCTYPE html[foo
bar]>
Previously this would result in incorrect tokens being emitted by the lexer. See
commit cbb2815146
for more information.
0.2.0 - 2014-11-17
CSS Selector Support
Probably the biggest feature of this release: support for querying documents using CSS selectors. Oga supports a subset of the CSS3 selector specification, in particular the following selectors are supported:
- Element, class and ID selectors
- Attribute selectors (e.g.
foo[x ~= "y"]
)
The following pseudo classes are supported:
:root
:nth-child(n)
:nth-last-child(n)
:nth-of-type(n)
:nth-last-of-type(n)
:first-child
:last-child
:first-of-type
:last-of-type
:only-child
:only-of-type
:empty
You can use CSS selectors using the methods css
and at_css
on an instance of
Oga::XML::Document
or Oga::XML::Element
. For example:
document = Oga.parse_xml('<people><person>Alice</person></people>')
document.css('people person') # => NodeSet(Element(name: "person" ...))
The architecture behind this is quite similar to parsing XPath. There's a lexer
(Oga::CSS::Lexer
) and a parser (Oga::CSS::Parser
). Unlike Nokogiri (and
perhaps other libraries) the parser does not output XPath expressions as a
String or a CSS specific AST. Instead it directly emits an XPath AST. This
allows the resulting AST to be directly evaluated by Oga::XPath::Evaluator
.
See https://github.com/YorickPeterse/oga/issues/11 for more information.
Mutli-line Attribute Support
Oga can now lex/parse elements that have attributes with newlines in them. Previously this would trigger memory allocation errors.
See https://github.com/YorickPeterse/oga/issues/58 for more information.
SAX after_element
The after_element
method in the SAX parsing API now always takes two
arguments: the namespace name and element name. Previously this method would
always receive a single nil value as its argument, which is rather pointless.
See https://github.com/YorickPeterse/oga/issues/54 for more information.
XPath Grouping
XPath expressions can now be grouped together using parenthesis. This allows one to specify a custom operator precedence.
Enumerator Parsing Input
Enumerator instances can now be used as input for Oga.parse_xml
and friends.
This can be used to download and parse XML files on the fly. For example:
enum = Enumerator.new do |yielder|
HTTPClient.get('http://some-website.com/some-big-file.xml') do |chunk|
yielder << chunk
end
end
document = Oga.parse_xml(enum)
See https://github.com/YorickPeterse/oga/issues/48 for more information.
Removing Attributes
Element attributes can now be removed using Oga::XML::Element#unset
:
element = Oga::XML::Element.new(:name => 'foo')
element.set('class', 'foo')
element.unset('class')
XPath Attributes
XPath predicates are now evaluated for every context node opposed to being
evaluated once for the entire context. This ensures that expressions such as
descendant-or-self::node()/foo[1]
are evaluated correctly.
Available Namespaces
When calling Oga::XML::Element#available_namespaces
the Hash returned by
Oga::XML::Element#namespaces
would be modified in place. This was a bug that
has been fixed in this release.
NodeSets
NodeSet instances can now be compared with each other using ==
. Previously
this would always consider two instances to be different from each other due to
the usage of the default Object#==
method.
XML Entities
XML entities such as &
and <
are now encoded/decoded by the lexer,
string and text nodes.
See https://github.com/YorickPeterse/oga/issues/49 for more information.
General
Source lines are no longer included in error messages generated by the XML parser. This simplifies the code and removes the need of re-reading the input (in case of IO/Enumerable inputs).
XML Lexer Newlines
Newlines in the XML lexer are now counted in native code (C/Java). On MRI and
JRuby the improvement is quite small, but on Rubinius it's a massive
improvement. See commit 8db77c0a09bf6c996dd2856a6dbe1ad076b1d30a
for more
information.
HTML Void Element Performance
Performance for detecting HTML void elements (e.g. <br>
and <link>
) has been
improved by removing String allocations that were not needed.
0.1.3 - 2014-09-24
This release fixes a problem with serializing attributes using the namespace prefix "xmlns". See https://github.com/YorickPeterse/oga/issues/47 for more information.
0.1.2 - 2014-09-23
SAX API
A SAX parser/API has been added. This API is useful when even the overhead of the pull-parser is too much memory wise. Example:
class ElementNames
attr_reader :names
def initialize
@names = []
end
def on_element(namespace, name, attrs = {})
@names << name
end
end
handler = ElementNames.new
Oga.sax_parse_xml(handler, '<foo><bar></bar></foo>')
handler.names # => ["foo", "bar"]
Racc Gem
Oga will now always use the Racc gem instead of the version shipped with the Ruby standard library.
Error Reporting
XML parser errors have been made a little bit more user friendly, though they can still be quite cryptic.
Serializing Elements
Elements serialized to XML/HTML will use self-closing tags whenever possible.
When parsing HTML documents only HTML void elements will use self-closing tags
(e.g. <link>
tags). Example:
Oga.parse_xml('<foo></foo>').to_xml # => "<foo />"
Oga.parse_html('<script></script>').to_xml # => "<script></script>"
Default Namespaces
Namespaces are no longer removed from the attributes list when an element is created.
Default XML namespaces can now be registered using xmlns="..."
. Previously
this would be ignored. Example:
document = Oga.parse_xml('<root xmlns="baz"></root>')
root = document.children[0]
root.namespace # => Namespace(name: "xmlns" uri: "baz")
Lexing Incomplete Input
Oga can now lex input such as </
without entering an infinite loop. Example:
Oga.parse_xml('</') # => Document(children: NodeSet(Text("</")))
Absolute XPath Paths
Oga can now parse and evaluate the XPath expression "/" (that is, just "/"). This will return the root node (usually a Document instance). Example:
document = Oga.parse_xml('<root></root>')
document.xpath('/') # => NodeSet(Document(children: NodeSet(Element(name: "root"))))
Namespace Ordering
Namespaces available to an element are now returned in the correct order. Previously outer namespaces would take precedence over inner namespaces, instead of it being the other way around. Example:
document = Oga.parse_xml <<-EOF
<root xmlns:foo="bar">
<container xmlns:foo="baz">
<foo:text>Text!</foo:text>
</container>
</root>
EOF
foo = document.at_xpath('root/container/foo:text')
foo.namespace # => Namespace(name: "foo" uri: "baz")
Parsing Capitalized HTML Void Elements
Oga is now capable of parsing capitalized HTML void elements (e.g. <BR>
).
Previously it could only parse lower-cased void elements. Thanks to Tero Tasanen
for fixing this. Example:
Oga.parse_html('<BR>') # => Document(children: NodeSet(Element(name: "BR")))
Node Type Method Removed
The node_type
method has been removed and its purpose has been moved into
the XML::PullParser
class itself. This method was solely used by the pull
parser to provide shorthands for node classes. As such it doesn't make sense to
expose this as a method to the outside world as a public method.
0.1.1 - 2014-09-13
This release fixes a problem where element attributes were not separated by spaces. Thanks to Jonathan Rochkind for reporting it and Bill Dueber providing an initial patch for this problem.
0.1.0 - 2014-09-12
The first public release of Oga. This release contains support for parsing XML, basic support for parsing HTML, support for querying documents using XPath and more.