Sequitur algorithm: Difference between revisions

Revision as of 15:26, 17 April 2008

Revision as of 15:34, 17 April 2008

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== Method summary ==

The algorithm works by scanning a sequence of [[terminal symbol]]s, building a list of all the symbol pairs which it has read. Whenever a second occurrence of a pair is discovered, the two occurrences are replaced in the sequence by an invented [[nonterminal symbol]], the list of symbol pairs is adjusted to match the new sequence, and scanning continues. Once the scanning has been completed, the listtransformed of symbol pairssequence can be interpreted as the top-level rule in a grammar for the original sequence. The rule definitions for the nonterminal symbols which it contains can be found in the list of symbol pairs. Those rule definitions may themselves contain additional nonterminal symbols whose rule definitions can also be read from elsewhere in the list of symbol pairs.

==External links==