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tl: add support for ##n and ##[i:j] from SVA

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* spot/tl/formula.cc, spot/tl/formula.hh (formula::sugar_delay): New
function to implement this operator as syntactic sugar.
* spot/parsetl/parsetl.yy, spot/parsetl/scantl.ll: Parse it.
* doc/tl/tl.tex: Document the syntactic sugar rules and precedence.
* tests/core/sugar.test: Add tests.
* NEWS: Mention this new feature.
This commit is contained in:
Alexandre Duret-Lutz 2019-05-04 21:50:59 +02:00
parent 00f70257db
commit 60d488b30c
7 changed files with 213 additions and 27 deletions
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6
NEWS
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@ -46,6 +46,12 @@ New in spot 2.7.4.dev (not yet released)
acceptance condition. The output can be alternating only if the
input was alternating.
- The parser for SERE learned to recognize the ##n and ##[i:j]
operators from SVA. So {##2 a ##0 b[+] ##1 c ##2 e} is another
way to write {[*2];a:b[+];c;1;e}, and {a ##[i:j] b} is parsed as
{a:{[*i..j];b}}. The formula::sugar_delay() function implement
this SVA operator in terms of the existing PSL operators.
New in spot 2.7.4 (2019-04-27)
Bugs fixed: