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| author | mudathirmahgoub <mudathir-mahgoubyahia@uiowa.edu> | 2020-04-08 18:24:16 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-04-08 18:24:16 -0500 |
| commit | df1ea6b9cdc1f424073151d0f7fda639d4405622 (patch) | |
| tree | f28bd734c6f78e7399f91e92d517343a779c09c3 /src/parser/cvc/Cvc.g | |
| parent | a48cafdd09c3ff8cb9984bad930343958c30ce56 (diff) | |
Added CHOOSE operator for sets (#4211)
This PR enables THEORY_UF by default for sets and adds the operator CHOOSE for sets which returns an element from a given set. The semantics is as follows:
If a set A = {x}, then the term (choose A) is equivalent to the term x.
If the set is empty, then (choose A) is an arbitrary value.
If the set has cardinality > 1, then (choose A) will deterministically return an element in A.
Diffstat (limited to 'src/parser/cvc/Cvc.g')
| -rw-r--r-- | src/parser/cvc/Cvc.g | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/parser/cvc/Cvc.g b/src/parser/cvc/Cvc.g index 32604d03f..3f03ca43d 100644 --- a/src/parser/cvc/Cvc.g +++ b/src/parser/cvc/Cvc.g @@ -205,6 +205,9 @@ tokens { BVSLE_TOK = 'BVSLE'; BVSGE_TOK = 'BVSGE'; + // Sets + SETS_CHOOSE_TOK = 'CHOOSE'; + // Relations JOIN_TOK = 'JOIN'; TRANSPOSE_TOK = 'TRANSPOSE'; @@ -327,7 +330,8 @@ int getOperatorPrecedence(int type) { case PRODUCT_TOK: case IDEN_TOK: case JOIN_IMAGE_TOK: - case TRANSCLOSURE_TOK: return 24; + case TRANSCLOSURE_TOK: + case SETS_CHOOSE_TOK: return 24; case LEQ_TOK: case LT_TOK: case GEQ_TOK: @@ -367,10 +371,12 @@ api::Kind getOperatorKind(int type, bool& negate) { case XOR_TOK: return api::XOR; case AND_TOK: return api::AND; + case SETS_CHOOSE_TOK: return api::CHOOSE; case PRODUCT_TOK: return api::PRODUCT; case JOIN_TOK: return api::JOIN; case JOIN_IMAGE_TOK: return api::JOIN_IMAGE; + // comparisonBinop case EQUAL_TOK: return api::EQUAL; case DISEQUAL_TOK: negate = true; return api::EQUAL; @@ -2097,6 +2103,8 @@ setsTerm[CVC4::api::Term& f] /* Sets prefix operators */ : SETS_CARD_TOK LPAREN formula[f] RPAREN { f = MK_TERM(CVC4::api::CARD, f); } + | SETS_CHOOSE_TOK LPAREN formula[f] RPAREN + { f = MK_TERM(CVC4::api::CHOOSE, f); } | simpleTerm[f] ; |