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Add _"squash"_ expressions to TatSu grammars #135

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apalala opened this issue Jun 1, 2019 · 2 comments
Open

Add _"squash"_ expressions to TatSu grammars #135

apalala opened this issue Jun 1, 2019 · 2 comments

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@apalala
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apalala commented Jun 1, 2019

The idea is taken from peg in which the expression:

 < e1 e2 ... en >

yields the concatenation e1+e2+...+en.
@apalala
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apalala commented Jun 1, 2019 •
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There needs to be syntax for this, and it might be the +() grouping operator, as the + appears in TatSu grammars only in {}+.

rule == e1 +(e2 e3) e4`

Could yield: (e1, e2+e3, e4)

@apalala
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apalala commented Jun 1, 2019 •
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What happens is the types of the elements are different? The types can currently be: str, tuple, closure, AST, and Node. Define an algebra over the + operator?

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@apalala