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-rw-r--r--libbuild2/functions-regex.cxx30
1 files changed, 19 insertions, 11 deletions
diff --git a/libbuild2/functions-regex.cxx b/libbuild2/functions-regex.cxx
index 7d0ca20..b0472ed 100644
--- a/libbuild2/functions-regex.cxx
+++ b/libbuild2/functions-regex.cxx
@@ -85,21 +85,23 @@ namespace build2
if (!subs)
return value (regex_match (s, rge)); // Return boolean value.
- names r;
match_results<string::const_iterator> m;
if (regex_match (s, m, rge))
{
assert (!m.empty ());
+ names r;
for (size_t i (1); i != m.size (); ++i)
{
if (m[i].matched)
r.emplace_back (m.str (i));
}
- }
- return value (move (r));
+ return value (move (r));
+ }
+ else
+ return value ();
}
// Determine if there is a match between the regular expression and some
@@ -143,13 +145,14 @@ namespace build2
if (!match && !subs)
return value (regex_search (s, rge)); // Return boolean value.
- names r;
match_results<string::const_iterator> m;
if (regex_search (s, m, rge))
{
assert (!m.empty ());
+ names r;
+
if (match)
{
assert (m[0].matched);
@@ -164,9 +167,11 @@ namespace build2
r.emplace_back (m.str (i));
}
}
- }
- return value (move (r));
+ return value (move (r));
+ }
+ else
+ return value ();
}
static pair<regex::flag_type, regex_constants::match_flag_type>
@@ -348,14 +353,15 @@ namespace build2
// Match a value of an arbitrary type against the regular expression.
// Convert the value to string prior to matching. Return the boolean value
// unless return_subs flag is specified (see below), in which case return
- // names (empty if no match).
+ // names (NULL if no match).
//
// The following flags are supported:
//
// icase - match ignoring case
//
// return_subs - return names (rather than boolean), that contain
- // sub-strings that match the marked sub-expressions
+ // sub-strings that match the marked sub-expressions and
+ // NULL if no match
//
f[".match"] = [](value s, string re, optional<names> flags)
{
@@ -373,17 +379,19 @@ namespace build2
// part of a value of an arbitrary type. Convert the value to string prior
// to searching. Return the boolean value unless return_match or
// return_subs flag is specified (see below) in which case return names
- // (empty if no match @@ Why not NULL?).
+ // (NULL if no match).
//
// The following flags are supported:
//
// icase - match ignoring case
//
// return_match - return names (rather than boolean), that contain a
- // sub-string that matches the whole regular expression
+ // sub-string that matches the whole regular expression and
+ // NULL if no match
//
// return_subs - return names (rather than boolean), that contain
- // sub-strings that match the marked sub-expressions
+ // sub-strings that match the marked sub-expressions and
+ // NULL if no match
//
// If both return_match and return_subs flags are specified then the
// sub-string that matches the whole regular expression comes first.