Snowball (programming language)

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Snowball is a small string processing programming language designed for creating stemming algorithms for use in information retrieval.^[1]

The name Snowball was chosen as a tribute to the SNOBOL programming language, "with which it shares the concept of string patterns delivering signals that are used to control the flow of the program."^[2] The creator of Snowball, Dr. Martin Porter, "toyed with the idea of calling it 'strippergram,'" because it "effectively provides a 'suffix STRIPPER GRAMmar.'"^[1]

The Snowball compiler translates a Snowball script (an .sbl file) into program in thread-safe ANSI C, Java, Ada, C#, Go, Javascript, Object Pascal, Python or Rust.^[3][4] For ANSI C, each Snowball script produces a program file and corresponding header file (with .c and .h extensions).^[3] The Snowball compiler checks the consistency of its script, and this check was used to discover a typo in a seminal academic paper by Dr. Julie Beth Lovins, notable computational linguist and creator of the Lovins Stemming Algorithm, which had remained undetected for 30 years.^[5]

The basic datatypes handled by Snowball are strings of characters, signed integers, and boolean truth values, or more simply strings, integers and booleans. Snowball's characters are either 8-bit wide, or 16-bit, depending on the mode of use. In particular, both ASCII and 16-bit Unicode are supported.^[2] Like the SNOBOL programming language, the flow of control in Snowball is arranged by the implicit use of signals (each statement returns a true or false value), rather than the explicit use of constructs such as if, then, and break found in C and many other programming languages.^[2]

Though the original Snowball website maintained by Dr. Martin Porter and colleague Richard Boulton has been closed since 2014 following Dr. Porter’s retirement,^[1][4][6] the site itself is still accessible, and the language continues to be developed as a community project on GitHub.^[1][4] Additionally, large projects like the Natural Language Toolkit (NLTK) for Python employ Snowball along with stemming algorithms designed by Dr. Porter and other contributors to the Snowball language.^[7][8]

• Official website
• Snowball Stemming language and algorithms project on GitHub
• Porter Stemmer in Snowball

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