Module html_parse
source code
This module implements a VERY limited parser that finds <link>
tags in the head of HTML or XHTML documents and parses out their
attributes according to the OpenID spec. It is a liberal parser, but it
requires these things from the data in order to work:
-
There must be an open <html> tag
-
There must be an open <head> tag inside of the <html> tag
-
Only <link>s that are found inside of the <head> tag are
parsed (this is by design)
-
The parser follows the OpenID specification in resolving the
attributes of the link tags. This means that the attributes DO NOT
get resolved as they would by an XML or HTML parser. In particular,
only certain entities get replaced, and href attributes do not get
resolved relative to a base URL.
From http://openid.net/specs.bml#linkrel:
-
The openid.server URL MUST be an absolute URL. OpenID consumers MUST
NOT attempt to resolve relative URLs.
-
The openid.server URL MUST NOT include entities other than &,
<, >, and ".
The parser ignores SGML comments and <![CDATA[blocks]]>. Both
kinds of quoting are allowed for attributes.
The parser deals with invalid markup in these ways:
-
Tag names are not case-sensitive
-
The <html> tag is accepted even when it is not at the top level
-
The <head> tag is accepted even when it is not a direct child
of the <html> tag, but a <html> tag must be an ancestor
of the <head> tag
-
<link> tags are accepted even when they are not direct children
of the <head> tag, but a <head> tag must be an ancestor
of the <link> tag
-
If there is no closing tag for an open <html> or <head>
tag, the remainder of the document is viewed as being inside of the
tag. If there is no closing tag for a <link> tag, the link tag
is treated as a short tag. Exceptions to this rule are that
<html> closes <html> and <body> or <head>
closes <head>
-
Attributes of the <link> tag are not required to be quoted.
-
In the case of duplicated attribute names, the attribute coming last
in the tag will be the value returned.
-
Any text that does not parse as an attribute within a link tag will
be ignored. (e.g. <link pumpkin rel='openid.server' /> will
ignore pumpkin)
-
If there are more than one <html> or <head> tag, the
parser only looks inside of the first one.
-
The contents of <script> tags are ignored entirely, except
unclosed <script> tags. Unclosed <script> tags are
ignored.
-
Any other invalid markup is ignored, including unclosed SGML comments
and unclosed <![CDATA[blocks.
|
[[(type(html), type(html))]]
|
parseLinkAttrs(html)
Find all link tags in a string representing a HTML document and
return a list of their attributes. |
source code
|
|
|
Find all link tags in a string representing a HTML document and return
a list of their attributes.
- Parameters:
html (str or unicode) - the text to parse - Returns: [[(type(html), type(html))]]
- A list of dictionaries of attributes, one for each link tag
|