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OS/2 Shareware BBS: 10 Tools
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LIFE-1.02
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LOADER.DOC
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1996-06-04
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LOADING FILES USING THE LIFE PARSER IN LIFE
NAME
loader: an implementation of simple_load that uses the parser written in Life
(so that all the syntax extensions are available), and also contains
some extensions that allow a usage similar to that of load (except
that only one file may be specified).
The term_expansion predicate is supported. In particular, grammar rules are
expanded automatically if they are written as facts.
The predicate term_expansion takes a term as first argument and returns a
clause or a list of clauses as second argument.
It is predefined for grammar rules and standard definitions. It is possible
to extend it to handle new kinds of definitions by adding new clauses to
term_expansion.
In the current state of the interpreter, the asserta query is necessary to be
sure the stated rule will actually be used.
USAGE:
load_l(Filename) ?
looks for the file Filename.lf or Filename in specified directories, and
loads the first it finds. Reloading the same file is not possible.
load_gr(Filename) ?
looks for the file Filename.gr in specified directories, and
loads the first it finds. Reloading the same file is not possible.
load_in(Filename) ?
looks for the file Filename.in in specified directories, and
loads the first it finds. Reloading the same file is possible.
FILES
The file loader.lf contains the loader.
The other files are:
- parser.lf : the Life parser
- tokenizer.lf : the tokenizer used to provide inputs to the parser
- accumulators.lf, std_expander.lf and acc_declarations.lf
All these files are automatically loaded if they are in the same directory.
They must be loaded with expand_load(true).
AUTHOR
Bruno Dumant
Copyright 1992 Digital Equipment Corporation
All Rights Reserved