Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
In a recent paper (M. Barash, A. Okhotin, "An extension of context-free grammars with one-sided context specifications", Inform. and Comput., 2014), the authors introduced an extension of the context-free grammars equipped with an operator for referring to the left context of the substring being defined. This paper proposes a more general model, in which context specifications may be two-sided, that is, both the left and the right contexts can be specified by the corresponding operators. The paper gives the definitions, presents several examples of grammars and establishes a basic normal form theorem. This normal form, in particular, leads to a simple parsing algorithm working in time O(n4), where n is the length of the input string.
Язык оригинала | английский |
---|---|
Страницы (с-по) | 134-153 |
Число страниц | 20 |
Журнал | Theoretical Computer Science |
Том | 591 |
DOI | |
Состояние | Опубликовано - 2 авг 2015 |
ID: 41139338