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expose nth over API, change _getitem_ in python bindings to use nth instead of at, add 'at' operator for the purpose of the previous semantics

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-03-17 11:23:01 -07:00
parent f534f79a21
commit 834cf962a1
7 changed files with 66 additions and 1 deletions
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10
src/api/z3_api.h
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@ -1168,6 +1168,7 @@ typedef enum {
Z3_OP_SEQ_EXTRACT,
Z3_OP_SEQ_REPLACE,
Z3_OP_SEQ_AT,
Z3_OP_SEQ_NTH,
Z3_OP_SEQ_LENGTH,
Z3_OP_SEQ_INDEX,
Z3_OP_SEQ_TO_RE,
@ -3420,11 +3421,20 @@ extern "C" {
/**
\brief Retrieve from \c s the unit sequence positioned at position \c index.
The sequence is empty if the index is out of bounds.
def_API('Z3_mk_seq_at' ,AST ,(_in(CONTEXT), _in(AST), _in(AST)))
*/
Z3_ast Z3_API Z3_mk_seq_at(Z3_context c, Z3_ast s, Z3_ast index);
/**
\brief Retrieve from \c s the element positioned at position \c index.
The function is under-specified if the index is out of bounds.
def_API('Z3_mk_seq_nth' ,AST ,(_in(CONTEXT), _in(AST), _in(AST)))
*/
Z3_ast Z3_API Z3_mk_seq_nth(Z3_context c, Z3_ast s, Z3_ast index);
/**
\brief Return the length of the sequence \c s.