|
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）』 ■ウィキペディアで「Syntax Definition Formalism」の詳細全文を読む スポンサード リンク
|