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Syntax Definition Formalism
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Syntax Definition Formalism : ウィキペディア英語版
Syntax Definition Formalism
The Syntax Definition Formalism (SDF) is a metasyntax used to define context-free grammars: that is, a formal way to describe formal languages. It can express the entire range of context-free grammars. Its current version is SDF3(). A parser and parser generator for SDF specifications are provided as part of the free ASF+SDF Meta Environment. These operate using the SGLR (Scannerless GLR parser). An SDF parser outputs parse trees or, in the case of ambiguities, parse forests.
==Overview==
Features of SDF:
* Supports the entire range of context-free languages
* Allows modular syntax definitions (grammars can import subgrammars) which enables reuse
* Supports annotations

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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