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Many small markup revisions to be more consistent with markup elsewhere, 

and to provide more consistent indexing.

Added an index entry.

Added documentation for the error and XMLParserType objects.
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Fred Drake 2000-10-29 05:10:30 +00:00
parent 4ba298c325
commit efffe8e317
1 changed files with 61 additions and 47 deletions
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108
Doc/lib/libpyexpat.tex
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@ -1,5 +1,5 @@
\section{\module{xml.parsers.expat} ---
Fast XML parsing using the Expat library}
Fast XML parsing using Expat}
\declaremodule{standard}{xml.parsers.expat}
\modulesynopsis{An interface to the Expat non-validating XML parser.}
@ -8,8 +8,8 @@
\versionadded{2.0}
The \module{xml.parsers.expat} module is a Python interface to the Expat
non-validating XML parser.
The \module{xml.parsers.expat} module is a Python interface to the
Expat\index{Expat} non-validating XML parser.
The module provides a single extension type, \class{xmlparser}, that
represents the current state of an XML parser. After an
\class{xmlparser} object has been created, various attributes of the object
@ -20,35 +20,48 @@ and markup in the XML document.
This module uses the \module{pyexpat}\refbimodindex{pyexpat} module to
provide access to the Expat parser. Direct use of the
\module{pyexpat} module is deprecated.
This module provides one exception and one type object:
\begin{excdesc}{error}
The exception raised when Expat reports an error.
\end{excdesc}
\begin{datadesc}{XMLParserType}
The type of the return values from the \function{ParserCreate()}
function.
\end{datadesc}
The \module{xml.parsers.expat} module contains two functions:
\begin{funcdesc}{ErrorString}{errno}
Returns an explanatory string for a given error number \var{errno}.
\end{funcdesc}
\begin{funcdesc}{ParserCreate}{\optional{encoding, namespace_separator}}
\begin{funcdesc}{ParserCreate}{\optional{encoding\optional{,
namespace_separator}}}
Creates and returns a new \class{xmlparser} object.
\var{encoding}, if specified, must be a string naming the encoding
used by the XML data. Expat doesn't support as many encodings as
Python does, and its repertoire of encodings can't be extended; it
supports UTF-8, UTF-16, ISO-8859-1 (Latin1), and ASCII.
% XXX pyexpat.c should only allow a 1-char string for this parameter
Expat can optionally do XML namespace processing for you, enabled by
providing a value for \var{namespace_separator}. When namespace
processing is enabled, element type names and attribute names that
belong to a namespace will be expanded. The element name
passed to the element handlers
providing a value for \var{namespace_separator}. The value must be a
one-character string; a \exception{ValueError} will be raised if the
string has an illegal length (\code{None} is considered the same as
omission). When namespace processing is enabled, element type names
and attribute names that belong to a namespace will be expanded. The
element name passed to the element handlers
\function{StartElementHandler()} and \function{EndElementHandler()}
will be the concatenation of the namespace URI, the namespace
separator character, and the local part of the name. If the namespace
separator is a zero byte (\code{chr(0)})
then the namespace URI and the local part will be
concatenated without any separator.
separator is a zero byte (\code{chr(0)}) then the namespace URI and
the local part will be concatenated without any separator.
For example, if \var{namespace_separator} is set to
\samp{ }, and the following document is parsed:
\character{ }, and the following document is parsed:
\begin{verbatim}
<?xml version="1.0"?>
@ -72,20 +85,20 @@ elem2
\class{xmlparser} objects have the following methods:
\begin{methoddesc}{Parse}{data \optional{, isfinal}}
\begin{methoddesc}[xmlparser]{Parse}{data \optional{, isfinal}}
Parses the contents of the string \var{data}, calling the appropriate
handler functions to process the parsed data. \var{isfinal} must be
true on the final call to this method. \var{data} can be the empty
string at any time.
\end{methoddesc}
\begin{methoddesc}{ParseFile}{file}
\begin{methoddesc}[xmlparser]{ParseFile}{file}
Parse XML data reading from the object \var{file}. \var{file} only
needs to provide the \method{read(\var{nbytes})} method, returning the
empty string when there's no more data.
\end{methoddesc}
\begin{methoddesc}{SetBase}{base}
\begin{methoddesc}[xmlparser]{SetBase}{base}
Sets the base to be used for resolving relative URIs in system identifiers in
declarations. Resolving relative identifiers is left to the application:
this value will be passed through as the base argument to the
@ -93,42 +106,43 @@ this value will be passed through as the base argument to the
and \function{UnparsedEntityDeclHandler} functions.
\end{methoddesc}
\begin{methoddesc}{GetBase}{}
\begin{methoddesc}[xmlparser]{GetBase}{}
Returns a string containing the base set by a previous call to
\method{SetBase()}, or \code{None} if
\method{SetBase()} hasn't been called.
\end{methoddesc}
\class{xmlparser} objects have the following attributes:
\begin{datadesc}{returns_unicode}
\begin{memberdesc}[xmlparser]{returns_unicode}
If this attribute is set to 1, the handler functions will be passed
Unicode strings. If \member{returns_unicode} is 0, 8-bit strings
containing UTF-8 encoded data will be passed to the handlers.
\end{datadesc}
\end{memberdesc}
The following attributes contain values relating to the most recent
error encountered by an \class{xmlparser} object, and will only have
correct values once a call to \method{Parse()} or \method{ParseFile()}
has raised a \exception{xml.parsers.expat.error} exception.
\begin{datadesc}{ErrorByteIndex}
\begin{memberdesc}[xmlparser]{ErrorByteIndex}
Byte index at which an error occurred.
\end{datadesc}
\end{memberdesc}
\begin{datadesc}{ErrorCode}
\begin{memberdesc}[xmlparser]{ErrorCode}
Numeric code specifying the problem. This value can be passed to the
\function{ErrorString()} function, or compared to one of the constants
defined in the \module{errors} object.
\end{datadesc}
\end{memberdesc}
\begin{datadesc}{ErrorColumnNumber}
\begin{memberdesc}[xmlparser]{ErrorColumnNumber}
Column number at which an error occurred.
\end{datadesc}
\end{memberdesc}
\begin{datadesc}{ErrorLineNumber}
\begin{memberdesc}[xmlparser]{ErrorLineNumber}
Line number at which an error occurred.
\end{datadesc}
\end{memberdesc}
Here is the list of handlers that can be set. To set a handler on an
\class{xmlparser} object \var{o}, use
@ -137,76 +151,76 @@ be taken from the following list, and \var{func} must be a callable
object accepting the correct number of arguments. The arguments are
all strings, unless otherwise stated.
\begin{methoddesc}{StartElementHandler}{name, attributes}
\begin{methoddesc}[xmlparser]{StartElementHandler}{name, attributes}
Called for the start of every element. \var{name} is a string
containing the element name, and \var{attributes} is a dictionary
mapping attribute names to their values.
\end{methoddesc}
\begin{methoddesc}{EndElementHandler}{name}
\begin{methoddesc}[xmlparser]{EndElementHandler}{name}
Called for the end of every element.
\end{methoddesc}
\begin{methoddesc}{ProcessingInstructionHandler}{target, data}
\begin{methoddesc}[xmlparser]{ProcessingInstructionHandler}{target, data}
Called for every processing instruction.
\end{methoddesc}
\begin{methoddesc}{CharacterDataHandler}{\var{data}}
\begin{methoddesc}[xmlparser]{CharacterDataHandler}{data}
Called for character data.
\end{methoddesc}
\begin{methoddesc}{UnparsedEntityDeclHandler}{entityName, base,
systemId, publicId,
notationName}
\begin{methoddesc}[xmlparser]{UnparsedEntityDeclHandler}{entityName, base,
systemId, publicId,
notationName}
Called for unparsed (NDATA) entity declarations.
\end{methoddesc}
\begin{methoddesc}{NotationDeclHandler}{notationName, base, systemId,
publicId}
\begin{methoddesc}[xmlparser]{NotationDeclHandler}{notationName, base,
systemId, publicId}
Called for notation declarations.
\end{methoddesc}
\begin{methoddesc}{StartNamespaceDeclHandler}{prefix, uri}
\begin{methoddesc}[xmlparser]{StartNamespaceDeclHandler}{prefix, uri}
Called when an element contains a namespace declaration.
\end{methoddesc}
\begin{methoddesc}{EndNamespaceDeclHandler}{prefix}
\begin{methoddesc}[xmlparser]{EndNamespaceDeclHandler}{prefix}
Called when the closing tag is reached for an element
that contained a namespace declaration.
\end{methoddesc}
\begin{methoddesc}{CommentHandler}{data}
\begin{methoddesc}[xmlparser]{CommentHandler}{data}
Called for comments.
\end{methoddesc}
\begin{methoddesc}{StartCdataSectionHandler}{}
\begin{methoddesc}[xmlparser]{StartCdataSectionHandler}{}
Called at the start of a CDATA section.
\end{methoddesc}
\begin{methoddesc}{EndCdataSectionHandler}{}
\begin{methoddesc}[xmlparser]{EndCdataSectionHandler}{}
Called at the end of a CDATA section.
\end{methoddesc}
\begin{methoddesc}{DefaultHandler}{data}
\begin{methoddesc}[xmlparser]{DefaultHandler}{data}
Called for any characters in the XML document for
which no applicable handler has been specified. This means
characters that are part of a construct which could be reported, but
for which no handler has been supplied.
\end{methoddesc}
\begin{methoddesc}{DefaultHandlerExpand}{data}
\begin{methoddesc}[xmlparser]{DefaultHandlerExpand}{data}
This is the same as the \function{DefaultHandler},
but doesn't inhibit expansion of internal entities.
The entity reference will not be passed to the default handler.
\end{methoddesc}
\begin{methoddesc}{NotStandaloneHandler}{}
\begin{methoddesc}[xmlparser]{NotStandaloneHandler}{}
Called if the XML document hasn't been declared as being a standalone
document.
\end{methoddesc}
\begin{methoddesc}{ExternalEntityRefHandler}{context, base, systemId,
publicId}
\begin{methoddesc}[xmlparser]{ExternalEntityRefHandler}{context, base,
systemId, publicId}
Called for references to external entities.
\end{methoddesc}