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Merge remote-tracking branch 'origin/topic/jsiwek/string-indexing'

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* origin/topic/jsiwek/string-indexing:
  Change substring index notation to use a colon (addresses #422).

Tweaked slightly to make it more generic, we may index other types
with slices eventually too.

Closes #422.
This commit is contained in:
Robin Sommer 2013-01-08 10:18:57 -08:00
commit 564e27abb6
7 changed files with 53 additions and 25 deletions
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17
src/Expr.cc
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@ -2801,12 +2801,27 @@ bool AssignExpr::DoUnserialize(UnserialInfo* info)
return UNSERIALIZE(&is_init);
}
IndexExpr::IndexExpr(Expr* arg_op1, ListExpr* arg_op2)
IndexExpr::IndexExpr(Expr* arg_op1, ListExpr* arg_op2, bool is_slice)
: BinaryExpr(EXPR_INDEX, arg_op1, arg_op2)
{
if ( IsError() )
return;
if ( is_slice )
{
if ( ! IsString(op1->Type()->Tag()) )
ExprError("slice notation indexing only supported for strings currently");
}
else if ( IsString(op1->Type()->Tag()) )
{
if ( arg_op2->Exprs().length() != 1 )
ExprError("invalid string index expression");
}
if ( IsError() )
return;
int match_type = op1->Type()->MatchesIndex(arg_op2);
if ( match_type == DOES_NOT_MATCH_INDEX )
SetError("not an index type");