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Logical markup.

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Fred Drake 1998-03-12 15:33:05 +00:00
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147
Doc/lib/libformatter.tex
View file

@ -6,8 +6,9 @@
This module supports two interface definitions, each with mulitple
implementations. The \emph{formatter} interface is used by the
\code{HTMLParser} class of the \code{htmllib} module, and the
\class{HTMLParser} class of the \module{htmllib} module, and the
\emph{writer} interface is required by the formatter interface.
\withsubitem{(im module htmllib)}{\ttindex{HTMLParser}}
Formatter objects transform an abstract flow of formatting events into
specific output events on writer objects. Formatters manage several
@ -47,17 +48,17 @@ be called without having to track whether the property was changed.
The following attributes are defined for formatter instance objects:
\setindexsubitem{(formatter object data)}
\setindexsubitem{(formatter attribute)}
\begin{datadesc}{writer}
The writer instance with which the formatter interacts.
\end{datadesc}
\setindexsubitem{(formatter object method)}
\setindexsubitem{(formatter method)}
\begin{funcdesc}{end_paragraph}{blanklines}
Close any open paragraphs and insert at least \code{blanklines}
Close any open paragraphs and insert at least \var{blanklines}
before the next paragraph.
\end{funcdesc}
@ -70,13 +71,13 @@ break the logical paragraph.
Insert a horizontal rule in the output. A hard break is inserted if
there is data in the current paragraph, but the logical paragraph is
not broken. The arguments and keywords are passed on to the writer's
\code{send_line_break()} method.
\method{send_line_break()} method.
\end{funcdesc}
\begin{funcdesc}{add_flowing_data}{data}
Provide data which should be formatted with collapsed whitespaces.
Whitespace from preceeding and successive calls to
\code{add_flowing_data()} is considered as well when the whitespace
\method{add_flowing_data()} is considered as well when the whitespace
collapse is performed. The data which is passed to this method is
expected to be word-wrapped by the output device. Note that any
word-wrapping still must be performed by the writer object due to the
@ -86,55 +87,55 @@ need to rely on device and font information.
\begin{funcdesc}{add_literal_data}{data}
Provide data which should be passed to the writer unchanged.
Whitespace, including newline and tab characters, are considered legal
in the value of \code{data}.
in the value of \var{data}.
\end{funcdesc}
\begin{funcdesc}{add_label_data}{format, counter}
Insert a label which should be placed to the left of the current left
margin. This should be used for constructing bulleted or numbered
lists. If the \code{format} value is a string, it is interpreted as a
format specification for \code{counter}, which should be an integer.
lists. If the \var{format} value is a string, it is interpreted as a
format specification for \var{counter}, which should be an integer.
The result of this formatting becomes the value of the label; if
\code{format} is not a string it is used as the label value directly.
\var{format} is not a string it is used as the label value directly.
The label value is passed as the only argument to the writer's
\code{send_label_data()} method. Interpretation of non-string label
\method{send_label_data()} method. Interpretation of non-string label
values is dependent on the associated writer.
Format specifications are strings which, in combination with a counter
value, are used to compute label values. Each character in the format
string is copied to the label value, with some characters recognized
to indicate a transform on the counter value. Specifically, the
character \samp{1} represents the counter value formatter as an
arabic number, the characters \samp{A} and \samp{a} represent
alphabetic representations of the counter value in upper and lower
case, respectively, and \samp{I} and \samp{i} represent the
counter value in Roman numerals, in upper and lower case. Note that
the alphabetic and roman transforms require that the counter value be
greater than zero.
character \character{1} represents the counter value formatter as an
arabic number, the characters \character{A} and \character{a}
represent alphabetic representations of the counter value in upper and
lower case, respectively, and \character{I} and \character{i}
represent the counter value in Roman numerals, in upper and lower
case. Note that the alphabetic and roman transforms require that the
counter value be greater than zero.
\end{funcdesc}
\begin{funcdesc}{flush_softspace}{}
Send any pending whitespace buffered from a previous call to
\code{add_flowing_data()} to the associated writer object. This
\method{add_flowing_data()} to the associated writer object. This
should be called before any direct manipulation of the writer object.
\end{funcdesc}
\begin{funcdesc}{push_alignment}{align}
Push a new alignment setting onto the alignment stack. This may be
\code{AS_IS} if no change is desired. If the alignment value is
changed from the previous setting, the writer's \code{new_alignment()}
method is called with the \code{align} value.
\constant{AS_IS} if no change is desired. If the alignment value is
changed from the previous setting, the writer's \method{new_alignment()}
method is called with the \var{align} value.
\end{funcdesc}
\begin{funcdesc}{pop_alignment}{}
Restore the previous alignment.
\end{funcdesc}
\begin{funcdesc}{push_font}{(size, italic, bold, teletype)}
\begin{funcdesc}{push_font}{\code{(}size, italic, bold, teletype\code{)}}
Change some or all font properties of the writer object. Properties
which are not set to \code{AS_IS} are set to the values passed in
which are not set to \constant{AS_IS} are set to the values passed in
while others are maintained at their current settings. The writer's
\code{new_font()} method is called with the fully resolved font
\method{new_font()} method is called with the fully resolved font
specification.
\end{funcdesc}
@ -144,10 +145,10 @@ Restore the previous font.
\begin{funcdesc}{push_margin}{margin}
Increase the number of left margin indentations by one, associating
the logical tag \code{margin} with the new indentation. The initial
the logical tag \var{margin} with the new indentation. The initial
margin level is \code{0}. Changed values of the logical tag must be
true values; false values other than \code{AS_IS} are not sufficient
to change the margin.
true values; false values other than \constant{AS_IS} are not
sufficient to change the margin.
\end{funcdesc}
\begin{funcdesc}{pop_margin}{}
@ -157,15 +158,15 @@ Restore the previous margin.
\begin{funcdesc}{push_style}{*styles}
Push any number of arbitrary style specifications. All styles are
pushed onto the styles stack in order. A tuple representing the
entire stack, including \code{AS_IS} values, is passed to the writer's
\code{new_styles()} method.
entire stack, including \constant{AS_IS} values, is passed to the
writer's \method{new_styles()} method.
\end{funcdesc}
\begin{funcdesc}{pop_style}{\optional{n\code{ = 1}}}
Pop the last \code{n} style specifications passed to
\code{push_style()}. A tuple representing the revised stack,
including \code{AS_IS} values, is passed to the writer's
\code{new_styles()} method.
Pop the last \var{n} style specifications passed to
\method{push_style()}. A tuple representing the revised stack,
including \constant{AS_IS} values, is passed to the writer's
\method{new_styles()} method.
\end{funcdesc}
\begin{funcdesc}{set_spacing}{spacing}
@ -175,7 +176,7 @@ Set the spacing style for the writer.
\begin{funcdesc}{assert_line_data}{\optional{flag\code{ = 1}}}
Inform the formatter that data has been added to the current paragraph
out-of-band. This should be used when the writer has been manipulated
directly. The optional \code{flag} argument can be set to false if
directly. The optional \var{flag} argument can be set to false if
the writer manipulations produced a hard line break at the end of the
output.
\end{funcdesc}
@ -189,20 +190,20 @@ subclassing.
\setindexsubitem{(in module formatter)}
\begin{funcdesc}{NullFormatter}{\optional{writer\code{ = None}}}
A formatter which does nothing. If \code{writer} is omitted, a
\code{NullWriter} instance is created. No methods of the writer are
called by \code{NullWriter} instances. Implementations should inherit
from this class if implementing a writer interface but don't need to
inherit any implementation.
\end{funcdesc}
\begin{classdesc}{NullFormatter}{\optional{writer}}
A formatter which does nothing. If \var{writer} is omitted, a
\class{NullWriter} instance is created. No methods of the writer are
called by \class{NullFormatter} instances. Implementations should
inherit from this class if implementing a writer interface but don't
need to inherit any implementation.
\end{classdesc}
\begin{funcdesc}{AbstractFormatter}{writer}
\begin{classdesc}{AbstractFormatter}{writer}
The standard formatter. This implementation has demonstrated wide
applicability to many writers, and may be used directly in most
circumstances. It has been used to implement a full-featured
world-wide web browser.
\end{funcdesc}
\end{classdesc}
@ -211,9 +212,9 @@ world-wide web browser.
Interfaces to create writers are dependent on the specific writer
class being instantiated. The interfaces described below are the
required interfaces which all writers must support once initialized.
Note that while most applications can use the \code{AbstractFormatter}
class as a formatter, the writer must typically be provided by the
application.
Note that while most applications can use the
\class{AbstractFormatter} class as a formatter, the writer must
typically be provided by the application.
\setindexsubitem{(writer object method)}
@ -222,40 +223,40 @@ Flush any buffered output or device control events.
\end{funcdesc}
\begin{funcdesc}{new_alignment}{align}
Set the alignment style. The \code{align} value can be any object,
Set the alignment style. The \var{align} value can be any object,
but by convention is a string or \code{None}, where \code{None}
indicates that the writer's ``preferred'' alignment should be used.
Conventional \code{align} values are \code{'left'}, \code{'center'},
Conventional \var{align} values are \code{'left'}, \code{'center'},
\code{'right'}, and \code{'justify'}.
\end{funcdesc}
\begin{funcdesc}{new_font}{font}
Set the font style. The value of \code{font} will be \code{None},
Set the font style. The value of \var{font} will be \code{None},
indicating that the device's default font should be used, or a tuple
of the form (\var{size}, \var{italic}, \var{bold}, \var{teletype}).
Size will be a string indicating the size of font that should be used;
specific strings and their interpretation must be defined by the
application. The \var{italic}, \var{bold}, and \var{teletype} values
are boolean indicators specifying which of those font attributes
should be used.
of the form \code{(}\var{size}, \var{italic}, \var{bold},
\var{teletype}\code{)}. Size will be a string indicating the size of
font that should be used; specific strings and their interpretation
must be defined by the application. The \var{italic}, \var{bold}, and
\var{teletype} values are boolean indicators specifying which of those
font attributes should be used.
\end{funcdesc}
\begin{funcdesc}{new_margin}{margin, level}
Set the margin level to the integer \code{level} and the logical tag
to \code{margin}. Interpretation of the logical tag is at the
Set the margin level to the integer \var{level} and the logical tag
to \var{margin}. Interpretation of the logical tag is at the
writer's discretion; the only restriction on the value of the logical
tag is that it not be a false value for non-zero values of
\code{level}.
\var{level}.
\end{funcdesc}
\begin{funcdesc}{new_spacing}{spacing}
Set the spacing style to \code{spacing}.
Set the spacing style to \var{spacing}.
\end{funcdesc}
\begin{funcdesc}{new_styles}{styles}
Set additional styles. The \code{styles} value is a tuple of
arbitrary values; the value \code{AS_IS} should be ignored. The
\code{styles} tuple may be interpreted either as a set or as a stack
Set additional styles. The \var{styles} value is a tuple of
arbitrary values; the value \constant{AS_IS} should be ignored. The
\var{styles} tuple may be interpreted either as a set or as a stack
depending on the requirements of the application and writer
implementation.
\end{funcdesc}
@ -265,8 +266,8 @@ Break the current line.
\end{funcdesc}
\begin{funcdesc}{send_paragraph}{blankline}
Produce a paragraph separation of at least \code{blankline} blank
lines, or the equivelent. The \code{blankline} value will be an
Produce a paragraph separation of at least \var{blankline} blank
lines, or the equivelent. The \var{blankline} value will be an
integer.
\end{funcdesc}
@ -274,7 +275,7 @@ integer.
Display a horizontal rule on the output device. The arguments to this
method are entirely application- and writer-specific, and should be
interpreted with care. The method implementation may assume that a
line break has already been issued via \code{send_line_break()}.
line break has already been issued via \method{send_line_break()}.
\end{funcdesc}
\begin{funcdesc}{send_flowing_data}{data}
@ -290,12 +291,12 @@ for display. Generally, this should be interpreted to mean that line
breaks indicated by newline characters should be preserved and no new
line breaks should be introduced. The data may contain embedded
newline and tab characters, unlike data provided to the
\code{send_formatted_data()} interface.
\method{send_formatted_data()} interface.
\end{funcdesc}
\begin{funcdesc}{send_label_data}{data}
Set \code{data} to the left of the current left margin, if possible.
The value of \code{data} is not restricted; treatment of non-string
Set \var{data} to the left of the current left margin, if possible.
The value of \var{data} is not restricted; treatment of non-string
values is entirely application- and writer-dependent. This method
will only be called at the beginning of a line.
\end{funcdesc}
@ -305,7 +306,7 @@ will only be called at the beginning of a line.
Three implementations of the writer object interface are provided as
examples by this module. Most applications will need to derive new
writer classes from the \code{NullWriter} class.
writer classes from the \class{NullWriter} class.
\setindexsubitem{(in module formatter)}
@ -321,10 +322,10 @@ else. Each method simply announces itself by printing its name and
arguments on standard output.
\end{funcdesc}
\begin{funcdesc}{DumbWriter}{\optional{file\code{ = None}\optional{\, maxcol\code{ = 72}}}}
\begin{funcdesc}{DumbWriter}{\optional{file\optional{\, maxcol\code{ = 72}}}}
Simple writer class which writes output on the file object passed in
as \code{file} or, if \code{file} is omitted, on standard output. The
as \var{file} or, if \var{file} is omitted, on standard output. The
output is simply word-wrapped to the number of columns specified by
\code{maxcol}. This class is suitable for reflowing a sequence of
\var{maxcol}. This class is suitable for reflowing a sequence of
paragraphs.
\end{funcdesc}

96
Doc/lib/libxmllib.tex
View file

@ -4,11 +4,14 @@
\stmodindex{xmllib}
\index{XML}
This module defines a class \code{XMLParser} which serves as the basis
This module defines a class \class{XMLParser} which serves as the basis
for parsing text files formatted in XML (eXtended Markup Language).
The \code{XMLParser} class must be instantiated without arguments. It
has the following interface methods:
\begin{classdesc}{XMLParser}{}
The \class{XMLParser} class must be instantiated without arguments.
\end{classdesc}
This class provides the following interface methods:
\setindexsubitem{(XMLParser method)}
@ -29,40 +32,40 @@ Enter literal mode (CDATA mode).
\begin{funcdesc}{feed}{data}
Feed some text to the parser. It is processed insofar as it consists
of complete elements; incomplete data is buffered until more data is
fed or \code{close()} is called.
fed or \method{close()} is called.
\end{funcdesc}
\begin{funcdesc}{close}{}
Force processing of all buffered data as if it were followed by an
end-of-file mark. This method may be redefined by a derived class to
define additional processing at the end of the input, but the
redefined version should always call \code{XMLParser.close()}.
redefined version should always call \method{close()}.
\end{funcdesc}
\begin{funcdesc}{translate_references}{data}
Translate all entity and character references in \code{data} and
Translate all entity and character references in \var{data} and
returns the translated string.
\end{funcdesc}
\begin{funcdesc}{handle_xml}{encoding\, standalone}
\begin{funcdesc}{handle_xml}{encoding, standalone}
This method is called when the \code{<?xml ...?>} tag is processed.
The arguments are the values of the encoding and standalone attributes
in the tag. Both encoding and standalone are optional. The values
passed to \code{handle_xml} default to \code{None} and the string
passed to \method{handle_xml()} default to \code{None} and the string
\code{'no'} respectively.
\end{funcdesc}
\begin{funcdesc}{handle_doctype}{tag\, data}
\begin{funcdesc}{handle_doctype}{tag, data}
This method is called when the \code{<!DOCTYPE...>} tag is processed.
The arguments are the name of the root element and the uninterpreted
contents of the tag, starting after the white space after the name of
the root element.
\end{funcdesc}
\begin{funcdesc}{handle_starttag}{tag\, method\, attributes}
\begin{funcdesc}{handle_starttag}{tag, method, attributes}
This method is called to handle start tags for which a
\code{start_\var{tag}()} method has been defined. The \code{tag}
argument is the name of the tag, and the \code{method} argument is the
\code{start_\var{tag}()} method has been defined. The \var{tag}
argument is the name of the tag, and the \method{method} argument is the
bound method which should be used to support semantic interpretation
of the start tag. The \var{attributes} argument is a dictionary of
attributes, the key being the \var{name} and the value being the
@ -71,19 +74,19 @@ Character and entity references in the \var{value} have
been interpreted. For instance, for the tag
\code{<A HREF="http://www.cwi.nl/">}, this method would be called as
\code{handle_starttag('A', self.start_A, \{'HREF': 'http://www.cwi.nl/'\})}.
The base implementation simply calls \code{method} with \code{attributes}
The base implementation simply calls \var{method} with \var{attributes}
as the only argument.
\end{funcdesc}
\begin{funcdesc}{handle_endtag}{tag\, method}
This method is called to handle endtags for which an
\code{end_\var{tag}()} method has been defined. The \code{tag}
\code{end_\var{tag}()} method has been defined. The \var{tag}
argument is the name of the tag, and the
\code{method} argument is the bound method which should be used to
\var{method} argument is the bound method which should be used to
support semantic interpretation of the end tag. If no
\code{end_\var{tag}()} method is defined for the closing element, this
handler is not called. The base implementation simply calls
\code{method}.
\var{method}.
\end{funcdesc}
\begin{funcdesc}{handle_data}{data}
@ -98,7 +101,7 @@ This method is called to process a character reference of the form
or a hexadecimal number when preceded by \code{x}.
In the base implementation, \var{ref} must be a number in the
range 0-255. It translates the character to \ASCII{} and calls the
method \code{handle_data()} with the character as argument. If
method \method{handle_data()} with the character as argument. If
\var{ref} is invalid or out of range, the method
\code{unknown_charref(\var{ref})} is called to handle the error. A
subclass must override this method to provide support for character
@ -106,21 +109,21 @@ references outside of the \ASCII{} range.
\end{funcdesc}
\begin{funcdesc}{handle_entityref}{ref}
This method is called to process a general entity reference of the form
\samp{\&\var{ref};} where \var{ref} is an general entity
This method is called to process a general entity reference of the
form \samp{\&\var{ref};} where \var{ref} is an general entity
reference. It looks for \var{ref} in the instance (or class)
variable \code{entitydefs} which should be a mapping from entity names
to corresponding translations.
If a translation is found, it calls the method \code{handle_data()}
variable \member{entitydefs} which should be a mapping from entity
names to corresponding translations.
If a translation is found, it calls the method \method{handle_data()}
with the translation; otherwise, it calls the method
\code{unknown_entityref(\var{ref})}. The default \code{entitydefs}
\code{unknown_entityref(\var{ref})}. The default \member{entitydefs}
defines translations for \code{\&amp;}, \code{\&apos}, \code{\&gt;},
\code{\&lt;}, and \code{\&quot;}.
\end{funcdesc}
\begin{funcdesc}{handle_comment}{comment}
This method is called when a comment is encountered. The
\code{comment} argument is a string containing the text between the
\var{comment} argument is a string containing the text between the
\samp{<!--} and \samp{-->} delimiters, but not the delimiters
themselves. For example, the comment \samp{<!--text-->} will
cause this method to be called with the argument \code{'text'}. The
@ -129,27 +132,27 @@ default method does nothing.
\begin{funcdesc}{handle_cdata}{data}
This method is called when a CDATA element is encountered. The
\code{data} argument is a string containing the text between the
\var{data} argument is a string containing the text between the
\samp{<![CDATA[} and \samp{]]>} delimiters, but not the delimiters
themselves. For example, the entity \samp{<![CDATA[text]]>} will
cause this method to be called with the argument \code{'text'}. The
default method does nothing.
default method does nothing, and is intended to be overridden.
\end{funcdesc}
\begin{funcdesc}{handle_proc}{name\, data}
This method is called when a processing instruction (PI) is encountered. The
\code{name} is the PI target, and the \code{data} argument is a
string containing the text between the PI target and the closing delimiter,
but not the delimiter itself. For example, the instruction
\samp{<?XML text?>} will cause this method to be called with the
arguments \code{'XML'} and \code{'text'}. The default method does
nothing. Note that if a document starts with a \code{<?xml ...?>}
tag, \code{handle_xml} is called to handle it.
\begin{funcdesc}{handle_proc}{name, data}
This method is called when a processing instruction (PI) is
encountered. The \var{name} is the PI target, and the \var{data}
argument is a string containing the text between the PI target and the
closing delimiter, but not the delimiter itself. For example, the
instruction \samp{<?XML text?>} will cause this method to be called
with the arguments \code{'XML'} and \code{'text'}. The default method
does nothing. Note that if a document starts with \code{<?xml
...?>}, \method{handle_xml()} is called to handle it.
\end{funcdesc}
\begin{funcdesc}{handle_special}{data}
This method is called when a declaration is encountered. The
\code{data} argument is a string containing the text between the
\var{data} argument is a string containing the text between the
\samp{<!} and \samp{>} delimiters, but not the delimiters
themselves. For example, the entity \samp{<!ENTITY text>} will
cause this method to be called with the argument \code{'ENTITY text'}. The
@ -159,11 +162,12 @@ handled separately if it is located at the start of the document.
\begin{funcdesc}{syntax_error}{message}
This method is called when a syntax error is encountered. The
\code{message} is a description of what was wrong. The default method
raises a \code{RuntimeError} exception. If this method is overridden,
it is permissable for it to return. This method is only called when
the error can be recovered from. Unrecoverable errors raise a
\code{RuntimeError} without first calling \code{syntax_error}.
\var{message} is a description of what was wrong. The default method
raises a \exception{RuntimeError} exception. If this method is
overridden, it is permissable for it to return. This method is only
called when the error can be recovered from. Unrecoverable errors
raise a \exception{RuntimeError} without first calling
\method{syntax_error()}.
\end{funcdesc}
\begin{funcdesc}{unknown_starttag}{tag\, attributes}
@ -199,8 +203,8 @@ correct case:
\begin{funcdescni}{start_\var{tag}}{attributes}
This method is called to process an opening tag \var{tag}. The
\var{attributes} argument has the same meaning as described for
\code{handle_starttag()} above. In fact, the base implementation of
\code{handle_starttag()} calls this method.
\method{handle_starttag()} above. In fact, the base implementation of
\method{handle_starttag()} calls this method.
\end{funcdescni}
\begin{funcdescni}{end_\var{tag}}{}
@ -215,7 +219,7 @@ the keys are the valid attributes for the element \var{tag}, and the
values the default values of the attributes, or \code{None} if there
is no default.
In addition to the attributes that were present in the tag, the
attribute dictionary that is passed to \code{handle_starttag()} and
\code{unknown_starttag()} contains values for all attributes that have a
default value.
attribute dictionary that is passed to \method{handle_starttag()} and
\method{unknown_starttag()} contains values for all attributes that
have a default value.
\end{datadescni}

147
Doc/libformatter.tex
View file

@ -6,8 +6,9 @@
This module supports two interface definitions, each with mulitple
implementations. The \emph{formatter} interface is used by the
\code{HTMLParser} class of the \code{htmllib} module, and the
\class{HTMLParser} class of the \module{htmllib} module, and the
\emph{writer} interface is required by the formatter interface.
\withsubitem{(im module htmllib)}{\ttindex{HTMLParser}}
Formatter objects transform an abstract flow of formatting events into
specific output events on writer objects. Formatters manage several
@ -47,17 +48,17 @@ be called without having to track whether the property was changed.
The following attributes are defined for formatter instance objects:
\setindexsubitem{(formatter object data)}
\setindexsubitem{(formatter attribute)}
\begin{datadesc}{writer}
The writer instance with which the formatter interacts.
\end{datadesc}
\setindexsubitem{(formatter object method)}
\setindexsubitem{(formatter method)}
\begin{funcdesc}{end_paragraph}{blanklines}
Close any open paragraphs and insert at least \code{blanklines}
Close any open paragraphs and insert at least \var{blanklines}
before the next paragraph.
\end{funcdesc}
@ -70,13 +71,13 @@ break the logical paragraph.
Insert a horizontal rule in the output. A hard break is inserted if
there is data in the current paragraph, but the logical paragraph is
not broken. The arguments and keywords are passed on to the writer's
\code{send_line_break()} method.
\method{send_line_break()} method.
\end{funcdesc}
\begin{funcdesc}{add_flowing_data}{data}
Provide data which should be formatted with collapsed whitespaces.
Whitespace from preceeding and successive calls to
\code{add_flowing_data()} is considered as well when the whitespace
\method{add_flowing_data()} is considered as well when the whitespace
collapse is performed. The data which is passed to this method is
expected to be word-wrapped by the output device. Note that any
word-wrapping still must be performed by the writer object due to the
@ -86,55 +87,55 @@ need to rely on device and font information.
\begin{funcdesc}{add_literal_data}{data}
Provide data which should be passed to the writer unchanged.
Whitespace, including newline and tab characters, are considered legal
in the value of \code{data}.
in the value of \var{data}.
\end{funcdesc}
\begin{funcdesc}{add_label_data}{format, counter}
Insert a label which should be placed to the left of the current left
margin. This should be used for constructing bulleted or numbered
lists. If the \code{format} value is a string, it is interpreted as a
format specification for \code{counter}, which should be an integer.
lists. If the \var{format} value is a string, it is interpreted as a
format specification for \var{counter}, which should be an integer.
The result of this formatting becomes the value of the label; if
\code{format} is not a string it is used as the label value directly.
\var{format} is not a string it is used as the label value directly.
The label value is passed as the only argument to the writer's
\code{send_label_data()} method. Interpretation of non-string label
\method{send_label_data()} method. Interpretation of non-string label
values is dependent on the associated writer.
Format specifications are strings which, in combination with a counter
value, are used to compute label values. Each character in the format
string is copied to the label value, with some characters recognized
to indicate a transform on the counter value. Specifically, the
character \samp{1} represents the counter value formatter as an
arabic number, the characters \samp{A} and \samp{a} represent
alphabetic representations of the counter value in upper and lower
case, respectively, and \samp{I} and \samp{i} represent the
counter value in Roman numerals, in upper and lower case. Note that
the alphabetic and roman transforms require that the counter value be
greater than zero.
character \character{1} represents the counter value formatter as an
arabic number, the characters \character{A} and \character{a}
represent alphabetic representations of the counter value in upper and
lower case, respectively, and \character{I} and \character{i}
represent the counter value in Roman numerals, in upper and lower
case. Note that the alphabetic and roman transforms require that the
counter value be greater than zero.
\end{funcdesc}
\begin{funcdesc}{flush_softspace}{}
Send any pending whitespace buffered from a previous call to
\code{add_flowing_data()} to the associated writer object. This
\method{add_flowing_data()} to the associated writer object. This
should be called before any direct manipulation of the writer object.
\end{funcdesc}
\begin{funcdesc}{push_alignment}{align}
Push a new alignment setting onto the alignment stack. This may be
\code{AS_IS} if no change is desired. If the alignment value is
changed from the previous setting, the writer's \code{new_alignment()}
method is called with the \code{align} value.
\constant{AS_IS} if no change is desired. If the alignment value is
changed from the previous setting, the writer's \method{new_alignment()}
method is called with the \var{align} value.
\end{funcdesc}
\begin{funcdesc}{pop_alignment}{}
Restore the previous alignment.
\end{funcdesc}
\begin{funcdesc}{push_font}{(size, italic, bold, teletype)}
\begin{funcdesc}{push_font}{\code{(}size, italic, bold, teletype\code{)}}
Change some or all font properties of the writer object. Properties
which are not set to \code{AS_IS} are set to the values passed in
which are not set to \constant{AS_IS} are set to the values passed in
while others are maintained at their current settings. The writer's
\code{new_font()} method is called with the fully resolved font
\method{new_font()} method is called with the fully resolved font
specification.
\end{funcdesc}
@ -144,10 +145,10 @@ Restore the previous font.
\begin{funcdesc}{push_margin}{margin}
Increase the number of left margin indentations by one, associating
the logical tag \code{margin} with the new indentation. The initial
the logical tag \var{margin} with the new indentation. The initial
margin level is \code{0}. Changed values of the logical tag must be
true values; false values other than \code{AS_IS} are not sufficient
to change the margin.
true values; false values other than \constant{AS_IS} are not
sufficient to change the margin.
\end{funcdesc}
\begin{funcdesc}{pop_margin}{}
@ -157,15 +158,15 @@ Restore the previous margin.
\begin{funcdesc}{push_style}{*styles}
Push any number of arbitrary style specifications. All styles are
pushed onto the styles stack in order. A tuple representing the
entire stack, including \code{AS_IS} values, is passed to the writer's
\code{new_styles()} method.
entire stack, including \constant{AS_IS} values, is passed to the
writer's \method{new_styles()} method.
\end{funcdesc}
\begin{funcdesc}{pop_style}{\optional{n\code{ = 1}}}
Pop the last \code{n} style specifications passed to
\code{push_style()}. A tuple representing the revised stack,
including \code{AS_IS} values, is passed to the writer's
\code{new_styles()} method.
Pop the last \var{n} style specifications passed to
\method{push_style()}. A tuple representing the revised stack,
including \constant{AS_IS} values, is passed to the writer's
\method{new_styles()} method.
\end{funcdesc}
\begin{funcdesc}{set_spacing}{spacing}
@ -175,7 +176,7 @@ Set the spacing style for the writer.
\begin{funcdesc}{assert_line_data}{\optional{flag\code{ = 1}}}
Inform the formatter that data has been added to the current paragraph
out-of-band. This should be used when the writer has been manipulated
directly. The optional \code{flag} argument can be set to false if
directly. The optional \var{flag} argument can be set to false if
the writer manipulations produced a hard line break at the end of the
output.
\end{funcdesc}
@ -189,20 +190,20 @@ subclassing.
\setindexsubitem{(in module formatter)}
\begin{funcdesc}{NullFormatter}{\optional{writer\code{ = None}}}
A formatter which does nothing. If \code{writer} is omitted, a
\code{NullWriter} instance is created. No methods of the writer are
called by \code{NullWriter} instances. Implementations should inherit
from this class if implementing a writer interface but don't need to
inherit any implementation.
\end{funcdesc}
\begin{classdesc}{NullFormatter}{\optional{writer}}
A formatter which does nothing. If \var{writer} is omitted, a
\class{NullWriter} instance is created. No methods of the writer are
called by \class{NullFormatter} instances. Implementations should
inherit from this class if implementing a writer interface but don't
need to inherit any implementation.
\end{classdesc}
\begin{funcdesc}{AbstractFormatter}{writer}
\begin{classdesc}{AbstractFormatter}{writer}
The standard formatter. This implementation has demonstrated wide
applicability to many writers, and may be used directly in most
circumstances. It has been used to implement a full-featured
world-wide web browser.
\end{funcdesc}
\end{classdesc}
@ -211,9 +212,9 @@ world-wide web browser.
Interfaces to create writers are dependent on the specific writer
class being instantiated. The interfaces described below are the
required interfaces which all writers must support once initialized.
Note that while most applications can use the \code{AbstractFormatter}
class as a formatter, the writer must typically be provided by the
application.
Note that while most applications can use the
\class{AbstractFormatter} class as a formatter, the writer must
typically be provided by the application.
\setindexsubitem{(writer object method)}
@ -222,40 +223,40 @@ Flush any buffered output or device control events.
\end{funcdesc}
\begin{funcdesc}{new_alignment}{align}
Set the alignment style. The \code{align} value can be any object,
Set the alignment style. The \var{align} value can be any object,
but by convention is a string or \code{None}, where \code{None}
indicates that the writer's ``preferred'' alignment should be used.
Conventional \code{align} values are \code{'left'}, \code{'center'},
Conventional \var{align} values are \code{'left'}, \code{'center'},
\code{'right'}, and \code{'justify'}.
\end{funcdesc}
\begin{funcdesc}{new_font}{font}
Set the font style. The value of \code{font} will be \code{None},
Set the font style. The value of \var{font} will be \code{None},
indicating that the device's default font should be used, or a tuple
of the form (\var{size}, \var{italic}, \var{bold}, \var{teletype}).
Size will be a string indicating the size of font that should be used;
specific strings and their interpretation must be defined by the
application. The \var{italic}, \var{bold}, and \var{teletype} values
are boolean indicators specifying which of those font attributes
should be used.
of the form \code{(}\var{size}, \var{italic}, \var{bold},
\var{teletype}\code{)}. Size will be a string indicating the size of
font that should be used; specific strings and their interpretation
must be defined by the application. The \var{italic}, \var{bold}, and
\var{teletype} values are boolean indicators specifying which of those
font attributes should be used.
\end{funcdesc}
\begin{funcdesc}{new_margin}{margin, level}
Set the margin level to the integer \code{level} and the logical tag
to \code{margin}. Interpretation of the logical tag is at the
Set the margin level to the integer \var{level} and the logical tag
to \var{margin}. Interpretation of the logical tag is at the
writer's discretion; the only restriction on the value of the logical
tag is that it not be a false value for non-zero values of
\code{level}.
\var{level}.
\end{funcdesc}
\begin{funcdesc}{new_spacing}{spacing}
Set the spacing style to \code{spacing}.
Set the spacing style to \var{spacing}.
\end{funcdesc}
\begin{funcdesc}{new_styles}{styles}
Set additional styles. The \code{styles} value is a tuple of
arbitrary values; the value \code{AS_IS} should be ignored. The
\code{styles} tuple may be interpreted either as a set or as a stack
Set additional styles. The \var{styles} value is a tuple of
arbitrary values; the value \constant{AS_IS} should be ignored. The
\var{styles} tuple may be interpreted either as a set or as a stack
depending on the requirements of the application and writer
implementation.
\end{funcdesc}
@ -265,8 +266,8 @@ Break the current line.
\end{funcdesc}
\begin{funcdesc}{send_paragraph}{blankline}
Produce a paragraph separation of at least \code{blankline} blank
lines, or the equivelent. The \code{blankline} value will be an
Produce a paragraph separation of at least \var{blankline} blank
lines, or the equivelent. The \var{blankline} value will be an
integer.
\end{funcdesc}
@ -274,7 +275,7 @@ integer.
Display a horizontal rule on the output device. The arguments to this
method are entirely application- and writer-specific, and should be
interpreted with care. The method implementation may assume that a
line break has already been issued via \code{send_line_break()}.
line break has already been issued via \method{send_line_break()}.
\end{funcdesc}
\begin{funcdesc}{send_flowing_data}{data}
@ -290,12 +291,12 @@ for display. Generally, this should be interpreted to mean that line
breaks indicated by newline characters should be preserved and no new
line breaks should be introduced. The data may contain embedded
newline and tab characters, unlike data provided to the
\code{send_formatted_data()} interface.
\method{send_formatted_data()} interface.
\end{funcdesc}
\begin{funcdesc}{send_label_data}{data}
Set \code{data} to the left of the current left margin, if possible.
The value of \code{data} is not restricted; treatment of non-string
Set \var{data} to the left of the current left margin, if possible.
The value of \var{data} is not restricted; treatment of non-string
values is entirely application- and writer-dependent. This method
will only be called at the beginning of a line.
\end{funcdesc}
@ -305,7 +306,7 @@ will only be called at the beginning of a line.
Three implementations of the writer object interface are provided as
examples by this module. Most applications will need to derive new
writer classes from the \code{NullWriter} class.
writer classes from the \class{NullWriter} class.
\setindexsubitem{(in module formatter)}
@ -321,10 +322,10 @@ else. Each method simply announces itself by printing its name and
arguments on standard output.
\end{funcdesc}
\begin{funcdesc}{DumbWriter}{\optional{file\code{ = None}\optional{\, maxcol\code{ = 72}}}}
\begin{funcdesc}{DumbWriter}{\optional{file\optional{\, maxcol\code{ = 72}}}}
Simple writer class which writes output on the file object passed in
as \code{file} or, if \code{file} is omitted, on standard output. The
as \var{file} or, if \var{file} is omitted, on standard output. The
output is simply word-wrapped to the number of columns specified by
\code{maxcol}. This class is suitable for reflowing a sequence of
\var{maxcol}. This class is suitable for reflowing a sequence of
paragraphs.
\end{funcdesc}

96
Doc/libxmllib.tex
View file

@ -4,11 +4,14 @@
\stmodindex{xmllib}
\index{XML}
This module defines a class \code{XMLParser} which serves as the basis
This module defines a class \class{XMLParser} which serves as the basis
for parsing text files formatted in XML (eXtended Markup Language).
The \code{XMLParser} class must be instantiated without arguments. It
has the following interface methods:
\begin{classdesc}{XMLParser}{}
The \class{XMLParser} class must be instantiated without arguments.
\end{classdesc}
This class provides the following interface methods:
\setindexsubitem{(XMLParser method)}
@ -29,40 +32,40 @@ Enter literal mode (CDATA mode).
\begin{funcdesc}{feed}{data}
Feed some text to the parser. It is processed insofar as it consists
of complete elements; incomplete data is buffered until more data is
fed or \code{close()} is called.
fed or \method{close()} is called.
\end{funcdesc}
\begin{funcdesc}{close}{}
Force processing of all buffered data as if it were followed by an
end-of-file mark. This method may be redefined by a derived class to
define additional processing at the end of the input, but the
redefined version should always call \code{XMLParser.close()}.
redefined version should always call \method{close()}.
\end{funcdesc}
\begin{funcdesc}{translate_references}{data}
Translate all entity and character references in \code{data} and
Translate all entity and character references in \var{data} and
returns the translated string.
\end{funcdesc}
\begin{funcdesc}{handle_xml}{encoding\, standalone}
\begin{funcdesc}{handle_xml}{encoding, standalone}
This method is called when the \code{<?xml ...?>} tag is processed.
The arguments are the values of the encoding and standalone attributes
in the tag. Both encoding and standalone are optional. The values
passed to \code{handle_xml} default to \code{None} and the string
passed to \method{handle_xml()} default to \code{None} and the string
\code{'no'} respectively.
\end{funcdesc}
\begin{funcdesc}{handle_doctype}{tag\, data}
\begin{funcdesc}{handle_doctype}{tag, data}
This method is called when the \code{<!DOCTYPE...>} tag is processed.
The arguments are the name of the root element and the uninterpreted
contents of the tag, starting after the white space after the name of
the root element.
\end{funcdesc}
\begin{funcdesc}{handle_starttag}{tag\, method\, attributes}
\begin{funcdesc}{handle_starttag}{tag, method, attributes}
This method is called to handle start tags for which a
\code{start_\var{tag}()} method has been defined. The \code{tag}
argument is the name of the tag, and the \code{method} argument is the
\code{start_\var{tag}()} method has been defined. The \var{tag}
argument is the name of the tag, and the \method{method} argument is the
bound method which should be used to support semantic interpretation
of the start tag. The \var{attributes} argument is a dictionary of
attributes, the key being the \var{name} and the value being the
@ -71,19 +74,19 @@ Character and entity references in the \var{value} have
been interpreted. For instance, for the tag
\code{<A HREF="http://www.cwi.nl/">}, this method would be called as
\code{handle_starttag('A', self.start_A, \{'HREF': 'http://www.cwi.nl/'\})}.
The base implementation simply calls \code{method} with \code{attributes}
The base implementation simply calls \var{method} with \var{attributes}
as the only argument.
\end{funcdesc}
\begin{funcdesc}{handle_endtag}{tag\, method}
This method is called to handle endtags for which an
\code{end_\var{tag}()} method has been defined. The \code{tag}
\code{end_\var{tag}()} method has been defined. The \var{tag}
argument is the name of the tag, and the
\code{method} argument is the bound method which should be used to
\var{method} argument is the bound method which should be used to
support semantic interpretation of the end tag. If no
\code{end_\var{tag}()} method is defined for the closing element, this
handler is not called. The base implementation simply calls
\code{method}.
\var{method}.
\end{funcdesc}
\begin{funcdesc}{handle_data}{data}
@ -98,7 +101,7 @@ This method is called to process a character reference of the form
or a hexadecimal number when preceded by \code{x}.
In the base implementation, \var{ref} must be a number in the
range 0-255. It translates the character to \ASCII{} and calls the
method \code{handle_data()} with the character as argument. If
method \method{handle_data()} with the character as argument. If
\var{ref} is invalid or out of range, the method
\code{unknown_charref(\var{ref})} is called to handle the error. A
subclass must override this method to provide support for character
@ -106,21 +109,21 @@ references outside of the \ASCII{} range.
\end{funcdesc}
\begin{funcdesc}{handle_entityref}{ref}
This method is called to process a general entity reference of the form
\samp{\&\var{ref};} where \var{ref} is an general entity
This method is called to process a general entity reference of the
form \samp{\&\var{ref};} where \var{ref} is an general entity
reference. It looks for \var{ref} in the instance (or class)
variable \code{entitydefs} which should be a mapping from entity names
to corresponding translations.
If a translation is found, it calls the method \code{handle_data()}
variable \member{entitydefs} which should be a mapping from entity
names to corresponding translations.
If a translation is found, it calls the method \method{handle_data()}
with the translation; otherwise, it calls the method
\code{unknown_entityref(\var{ref})}. The default \code{entitydefs}
\code{unknown_entityref(\var{ref})}. The default \member{entitydefs}
defines translations for \code{\&amp;}, \code{\&apos}, \code{\&gt;},
\code{\&lt;}, and \code{\&quot;}.
\end{funcdesc}
\begin{funcdesc}{handle_comment}{comment}
This method is called when a comment is encountered. The
\code{comment} argument is a string containing the text between the
\var{comment} argument is a string containing the text between the
\samp{<!--} and \samp{-->} delimiters, but not the delimiters
themselves. For example, the comment \samp{<!--text-->} will
cause this method to be called with the argument \code{'text'}. The
@ -129,27 +132,27 @@ default method does nothing.
\begin{funcdesc}{handle_cdata}{data}
This method is called when a CDATA element is encountered. The
\code{data} argument is a string containing the text between the
\var{data} argument is a string containing the text between the
\samp{<![CDATA[} and \samp{]]>} delimiters, but not the delimiters
themselves. For example, the entity \samp{<![CDATA[text]]>} will
cause this method to be called with the argument \code{'text'}. The
default method does nothing.
default method does nothing, and is intended to be overridden.
\end{funcdesc}
\begin{funcdesc}{handle_proc}{name\, data}
This method is called when a processing instruction (PI) is encountered. The
\code{name} is the PI target, and the \code{data} argument is a
string containing the text between the PI target and the closing delimiter,
but not the delimiter itself. For example, the instruction
\samp{<?XML text?>} will cause this method to be called with the
arguments \code{'XML'} and \code{'text'}. The default method does
nothing. Note that if a document starts with a \code{<?xml ...?>}
tag, \code{handle_xml} is called to handle it.
\begin{funcdesc}{handle_proc}{name, data}
This method is called when a processing instruction (PI) is
encountered. The \var{name} is the PI target, and the \var{data}
argument is a string containing the text between the PI target and the
closing delimiter, but not the delimiter itself. For example, the
instruction \samp{<?XML text?>} will cause this method to be called
with the arguments \code{'XML'} and \code{'text'}. The default method
does nothing. Note that if a document starts with \code{<?xml
...?>}, \method{handle_xml()} is called to handle it.
\end{funcdesc}
\begin{funcdesc}{handle_special}{data}
This method is called when a declaration is encountered. The
\code{data} argument is a string containing the text between the
\var{data} argument is a string containing the text between the
\samp{<!} and \samp{>} delimiters, but not the delimiters
themselves. For example, the entity \samp{<!ENTITY text>} will
cause this method to be called with the argument \code{'ENTITY text'}. The
@ -159,11 +162,12 @@ handled separately if it is located at the start of the document.
\begin{funcdesc}{syntax_error}{message}
This method is called when a syntax error is encountered. The
\code{message} is a description of what was wrong. The default method
raises a \code{RuntimeError} exception. If this method is overridden,
it is permissable for it to return. This method is only called when
the error can be recovered from. Unrecoverable errors raise a
\code{RuntimeError} without first calling \code{syntax_error}.
\var{message} is a description of what was wrong. The default method
raises a \exception{RuntimeError} exception. If this method is
overridden, it is permissable for it to return. This method is only
called when the error can be recovered from. Unrecoverable errors
raise a \exception{RuntimeError} without first calling
\method{syntax_error()}.
\end{funcdesc}
\begin{funcdesc}{unknown_starttag}{tag\, attributes}
@ -199,8 +203,8 @@ correct case:
\begin{funcdescni}{start_\var{tag}}{attributes}
This method is called to process an opening tag \var{tag}. The
\var{attributes} argument has the same meaning as described for
\code{handle_starttag()} above. In fact, the base implementation of
\code{handle_starttag()} calls this method.
\method{handle_starttag()} above. In fact, the base implementation of
\method{handle_starttag()} calls this method.
\end{funcdescni}
\begin{funcdescni}{end_\var{tag}}{}
@ -215,7 +219,7 @@ the keys are the valid attributes for the element \var{tag}, and the
values the default values of the attributes, or \code{None} if there
is no default.
In addition to the attributes that were present in the tag, the
attribute dictionary that is passed to \code{handle_starttag()} and
\code{unknown_starttag()} contains values for all attributes that have a
default value.
attribute dictionary that is passed to \method{handle_starttag()} and
\method{unknown_starttag()} contains values for all attributes that
have a default value.
\end{datadescni}