68 lines
2.7 KiB
TeX
68 lines
2.7 KiB
TeX
\section{\module{tokenize} ---
|
|
Tokenizer for Python source}
|
|
|
|
\declaremodule{standard}{tokenize}
|
|
\modulesynopsis{Lexical scanner for Python source code.}
|
|
\moduleauthor{Ka Ping Yee}{}
|
|
\sectionauthor{Fred L. Drake, Jr.}{fdrake@acm.org}
|
|
|
|
|
|
The \module{tokenize} module provides a lexical scanner for Python
|
|
source code, implemented in Python. The scanner in this module
|
|
returns comments as tokens as well, making it useful for implementing
|
|
``pretty-printers,'' including colorizers for on-screen displays.
|
|
|
|
The primary entry point is a generator:
|
|
|
|
\begin{funcdesc}{generate_tokens}{readline}
|
|
The \function{generate_tokens()} generator requires one argment,
|
|
\var{readline}, which must be a callable object which
|
|
provides the same interface as the \method{readline()} method of
|
|
built-in file objects (see section~\ref{bltin-file-objects}). Each
|
|
call to the function should return one line of input as a string.
|
|
|
|
The generator produces 5-tuples with these members:
|
|
the token type;
|
|
the token string;
|
|
a 2-tuple \code{(\var{srow}, \var{scol})} of ints specifying the
|
|
row and column where the token begins in the source;
|
|
a 2-tuple \code{(\var{erow}, \var{ecol})} of ints specifying the
|
|
row and column where the token ends in the source;
|
|
and the line on which the token was found.
|
|
The line passed is the \emph{logical} line;
|
|
continuation lines are included.
|
|
\versionadded{2.2}
|
|
\end{funcdesc}
|
|
|
|
An older entry point is retained for backward compatibility:
|
|
|
|
\begin{funcdesc}{tokenize}{readline\optional{, tokeneater}}
|
|
The \function{tokenize()} function accepts two parameters: one
|
|
representing the input stream, and one providing an output mechanism
|
|
for \function{tokenize()}.
|
|
|
|
The first parameter, \var{readline}, must be a callable object which
|
|
provides the same interface as the \method{readline()} method of
|
|
built-in file objects (see section~\ref{bltin-file-objects}). Each
|
|
call to the function should return one line of input as a string.
|
|
|
|
The second parameter, \var{tokeneater}, must also be a callable
|
|
object. It is called once for each token, with five arguments,
|
|
corresponding to the tuples generated by \function{generate_tokens()}.
|
|
\end{funcdesc}
|
|
|
|
|
|
All constants from the \refmodule{token} module are also exported from
|
|
\module{tokenize}, as are two additional token type values that might be
|
|
passed to the \var{tokeneater} function by \function{tokenize()}:
|
|
|
|
\begin{datadesc}{COMMENT}
|
|
Token value used to indicate a comment.
|
|
\end{datadesc}
|
|
\begin{datadesc}{NL}
|
|
Token value used to indicate a non-terminating newline. The NEWLINE
|
|
token indicates the end of a logical line of Python code; NL tokens
|
|
are generated when a logical line of code is continued over multiple
|
|
physical lines.
|
|
\end{datadesc}
|