An Analytical Description of CHILL, the CCITT High Level by Paul Branquart

By Paul Branquart

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ENV+, PREMODE÷, etc. ENV+ denotes a static environment, whatever the three dots stand for. (9) For CF-rules with only one nonterminal on the rhight, two shorthand Then conventions are used. Let + be such a rule. A+ = A~, B÷ = B The shorthand "Pass A~" is also used if the attribute A~ is to be passed to all non terminals on the right hand side, as is often the case for ENVY. B÷. 3. ELABORATION FUNCTIONS (I) The dynamic semantics of each construct of the language is specified by "elaboration functions" attached to the context-free rules which describe the context-free form of the construct.

A "when-phrase" is a list of predicates which must be satisfied for a program to be correct. These predicates either restrict the set of correct productions of a context-free rule (see Example 13) or disambiguate an otherwise ambiguous set of rules (see Example 14). Example 13 ÷ STEP () When empty() ~empty( ~ , <~t~uoture field> + and 27 0-13 give an ambiguity since a also is a .

Whereas the different alternatives of a same rule are numbered (1),(2),etc. (8) To shorten the description, a small part of the context-free structure of the language has been described by "when phrases" in the attribute system instead of being put in context-free rules. A "when-phrase" is a list of predicates which must be satisfied for a program to be correct. These predicates either restrict the set of correct productions of a context-free rule (see Example 13) or disambiguate an otherwise ambiguous set of rules (see Example 14).

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