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Add array-style index accessor for strings. Addresses #422.

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The index expression can take up to two indices for the start and end
index of the substring to return (e.g. "mystring[1,3]").  Negative
indices are allowed, with -1 representing the last character in the
string.  The indexing is not cyclic -- if the starting index is >= the
length of the string an empty string is returned, and if the ending
index is >= the length of the string then it's interpreted as the last
index of the string.  Assigning to substrings accessed like this isn't
allowed.
This commit is contained in:
Jon Siwek 2012-12-20 17:13:06 -06:00
parent ea6b62f586
commit 55c515d50a
5 changed files with 115 additions and 10 deletions
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10
src/Type.cc
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@ -114,8 +114,16 @@ BroType::~BroType()
delete [] type_id;
}
int BroType::MatchesIndex(ListExpr*& /* index */) const
int BroType::MatchesIndex(ListExpr*& index) const
{
if ( Tag() == TYPE_STRING )
{
if ( index->Exprs().length() != 1 && index->Exprs().length() != 2 )
return DOES_NOT_MATCH_INDEX;
if ( check_and_promote_exprs_to_type(index, ::base_type(TYPE_INT)) )
return MATCHES_INDEX_SCALAR;
}
return DOES_NOT_MATCH_INDEX;
}