An efficient context-free parsing algorithm
Communications of the ACM
Types and programming languages
Types and programming languages
Yet another meta-language for programming language processing
ACM SIGPLAN Notices
The Definition of Standard ML
XDuce: A statically typed XML processing language
ACM Transactions on Internet Technology (TOIT)
Towards practical computable functions on context-free languages
TAMC'06 Proceedings of the Third international conference on Theory and Applications of Models of Computation
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A type checking method for the functional language LFC is presented. A distinct feature of LFC is that it uses Context-Free (CF) languages as data types to represent compound data structures. This makes LFC a dynamically typed language. To improve efficiency, a practical type checking method is presented, which consists of both static and dynamic type checking. Although the inclusion relation of CF languages is not decidable, a special subset of the relation is decidable, i.e., the sentential form relation, which can be statically checked. Moreover, most of the expressions in actual LFC programs appear to satisfy this relation according to the statistic data of experiments. So, despite that the static type checking is not complete, it undertakes most of the type checking task. Consequently the run-time efficiency is effectively improved. Another feature of the type checking is that it converts the expressions with implicit structures to structured representation. Structure reconstruction technique is presented.