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