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pack(tokenize) :-

A modest tokenization library for SWI-Prolog, seeking a balance between simplicity and flexibility.

CircleCI

Synopsis

?- tokenize(`\tExample  Text.`, Tokens).
Tokens = [cntrl('\t'), word(example), space(' '), space(' '), word(text), punct('.')]

?- tokenize(`\tExample  Text.`, Tokens, [cntrl(false), pack(true), cased(true)]).
Tokens = [word('Example', 1), space(' ', 2), word('Text', 1), punct('.', 1)]

?- tokenize(`\tExample  Text.`, Tokens), untokenize(Tokens, Text), format('~s~n', [Text]).
	example  text.
Tokens = [cntrl('\t'), word(example), space(' '), space(' '), word(text), punct('.')],
Text = [9, 101, 120, 97, 109, 112, 108, 101, 32|...]

Description

Module tokenize provides a straightforward tool for lexing text into a list of tokens. It supports several options to customize the kinds of tokens generated, but it errs on the side of simplicity over flexibility.

tokenize is not a viable alternative to industrial strength lexer generators, but it is a useful tool if you need to lex some text into common tokens to ease your parsing needs.

Installation

tokenize is packaged as an SWI-Prolog pack. Install it into your SWI-Prolog system by running the following query in the swipl top level:

?- pack_install(tokenize).

Then answer y at the prompts.

Usage

Import the library into your source files with the directive

:- use_module(library(tokenize)).

Please see the documentation and consult the wiki for more detailed instructions and examples, including a full list of supported options.

Contributing

See the CONTRIBUTING.md document.

About

A tokenizer written in (SWI-)Prolog. It has some useful features and some flexibility and it might improve.

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