Term Wrap

Support a split operator for each constructor. -- EelcoVisser - 27 Oct 2001

This feature is introduced in StrategoRelease063. -- EelcoVisser - 22 Nov 2001

Term patterns can contain strategy applications.

TermWrap patterns simplify wrapping some complex constructor pattern around a term. For instance, split(f,g) can now be written as

  !(<f>,<g>)

and this generalizes to arbitrary build patterns.

TermProject patterns simplify projection of sub-terms. A strategy application inside a match pattern selects the corresponding sub-term and applies s to it. For example, instead of writing

  A : Typed(Var(x),_) -> x

it is now possible to write

  A = ?Typed(Var(<id>),_)

This feature can also be used to perform tests on subterm in a match pattern, e.g., the pattern

  ?[x | <not([])>]

binds the head of a list to x, checks that the tail is not empty and produces the tail as result.

-- EelcoVisser - 22 Nov 2001

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CategoryDone^? | LanguageExtensions