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2. Grammar-based code - Wikipedia

   en.wikipedia.org/wiki/Grammar-based_code

   It includes block codes, the multilevel pattern matching (MPM) algorithm, [3] variations of the incremental parsing Lempel-Ziv code, [4] and many other new universal lossless compression algorithms. Grammar-based codes are universal in the sense that they can achieve asymptotically the entropy rate of any stationary, ergodic source with a ...

3. Context-free grammar - Wikipedia

   en.wikipedia.org/wiki/Context-free_grammar

   It is decidable whether a given grammar is a regular grammar, [f] as well as whether it is an LL grammar for a given k≥0. [26]: 233 If k is not given, the latter problem is undecidable. [26]: 252 Given a context-free grammar, it is not decidable whether its language is regular, [27] nor whether it is an LL(k) language for a given k.

4. LALR parser generator - Wikipedia

   en.wikipedia.org/wiki/LALR_parser_generator

   A lookahead LR parser (LALR) generator is a software tool that reads a context-free grammar (CFG) and creates an LALR parser which is capable of parsing files written in the context-free language defined by the CFG. LALR parsers are desirable because they are very fast and small in comparison to other types of parsers.

5. Shift-reduce parser - Wikipedia

   en.wikipedia.org/wiki/Shift-Reduce_Parser

   The parser's program code is a simple generic loop that applies unchanged to many grammars and languages. The tables may be worked out by hand for precedence methods. For LR methods, the complex tables are mechanically derived from a grammar by some parser generator tool like Bison. [3] The parser tables are usually much larger than the grammar.

6. LR parser - Wikipedia

   en.wikipedia.org/wiki/LR_parser

   The grammar doesn't cover all language rules, such as the size of numbers, or the consistent use of names and their definitions in the context of the whole program. LR parsers use a context-free grammar that deals just with local patterns of symbols. The example grammar used here is a tiny subset of the Java or C language: r0: Goal → Sums eof

7. Formal grammar - Wikipedia

   en.wikipedia.org/wiki/Formal_grammar

   A formal grammar describes which strings from an alphabet of a formal language are valid according to the language's syntax. A grammar does not describe the meaning of the strings or what can be done with them in whatever context—only their form. A formal grammar is defined as a set of production rules for such strings in a formal language.

8. AOL Mail

   mail.aol.com/?icid=aol.com-nav

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. CYK algorithm - Wikipedia

   en.wikipedia.org/wiki/CYK_algorithm

   Any context-free grammar that does not generate the empty string can be represented in CNF using only production rules of the forms and ; to allow for the empty string, one can explicitly allow , where is the start symbol.