parsing expression grammar造句

This idea is also used in parsing expression grammars.
Like with some programming languages Lojban grammar can be parsed using parsing expression grammars.
The grammar of an output parser can be described in a PEG ( Parsing Expression Grammar ).
Therefore, not all languages that can be expressed using parsing expression grammars can be parsed by LL or LR parsers.
Parsing expression grammars build on the BNF and regular expression notations to form an alternative class of formal grammar, which is essentially generative in character.
It's difficult to find parsing expression grammar in a sentence. 用parsing expression grammar造句挺难的

The fundamental difference between context-free grammars and parsing expression grammars is that the PEG's choice operator is " ordered ".
Parsing expression grammars ( PEGs ), invented by Bryan Ford, extend these simple predicates by allowing " not predicates " and permitting a predicate to appear anywhere within a production.
By contrast, in the speed optimization application of memoization, Ford demonstrated that memoization could guarantee that parsing expression grammars could parse in languages that resulted in worst-case backtracking behavior.
For example, the following parsing expression grammar describes the classic non-context-free language \ { a ^ n b ^ n c ^ n : n \ ge 1 \ }:
It is also possible to build LL parsers and LR parsers from parsing expression grammars, with better worst-case performance than a recursive descent parser, but the unlimited lookahead capability of the grammar formalism is then lost.
The update also noted that a job opening had been posted for parsing expression grammar . ) In other news, Sumana Harihareswara was hired as a contractor to help out with Google Summer of Code 2011 and the Berlin Developer meeting.