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-rw-r--r--libbuild2/functions-regex.cxx74
1 files changed, 54 insertions, 20 deletions
diff --git a/libbuild2/functions-regex.cxx b/libbuild2/functions-regex.cxx
index a7dadd7..ca7e229 100644
--- a/libbuild2/functions-regex.cxx
+++ b/libbuild2/functions-regex.cxx
@@ -168,7 +168,9 @@ namespace build2
}
static pair<regex::flag_type, regex_constants::match_flag_type>
- parse_replacement_flags (optional<names>&& flags, bool first_only = true)
+ parse_replacement_flags (optional<names>&& flags,
+ bool first_only = true,
+ bool* copy_empty = nullptr)
{
regex::flag_type rf (regex::ECMAScript);
regex_constants::match_flag_type mf (regex_constants::match_default);
@@ -185,6 +187,8 @@ namespace build2
mf |= regex_constants::format_first_only;
else if (s == "format_no_copy")
mf |= regex_constants::format_no_copy;
+ else if (copy_empty != nullptr && s == "format_copy_empty")
+ *copy_empty = true;
else
throw invalid_argument ("invalid flag '" + s + '\'');
}
@@ -328,7 +332,10 @@ namespace build2
const string& fmt,
optional<names>&& flags)
{
- auto fl (parse_replacement_flags (move (flags), false));
+ bool copy_empty (false);
+ auto fl (parse_replacement_flags (move (flags),
+ false /* first_only */,
+ &copy_empty));
regex rge (parse_regex (re, fl.first));
names r;
@@ -336,10 +343,10 @@ namespace build2
try
{
regex_replace_search (to_string (move (v)), rge, fmt,
- [&r] (string::const_iterator b,
- string::const_iterator e)
+ [copy_empty, &r] (string::const_iterator b,
+ string::const_iterator e)
{
- if (b != e)
+ if (copy_empty || b != e)
r.emplace_back (string (b, e));
},
fl.second);
@@ -363,7 +370,10 @@ namespace build2
const string& fmt,
optional<names>&& flags)
{
- auto fl (parse_replacement_flags (move (flags)));
+ bool copy_empty (false);
+ auto fl (parse_replacement_flags (move (flags),
+ true /* first_only */,
+ &copy_empty));
regex rge (parse_regex (re, fl.first));
names r;
@@ -377,7 +387,7 @@ namespace build2
fmt,
fl.second).first);
- if (!s.empty ())
+ if (copy_empty || !s.empty ())
r.emplace_back (move (s));
}
}
@@ -459,13 +469,17 @@ namespace build2
optional<string>&& delim,
optional<names>&& flags)
{
- auto fl (parse_replacement_flags (move (flags)));
+ bool copy_empty (false);
+ auto fl (parse_replacement_flags (move (flags),
+ true /* first_only */,
+ &copy_empty));
regex rge (parse_regex (re, fl.first));
string rs;
try
{
+ bool first (true);
for (auto& v: s)
{
string s (regex_replace_search (convert<string> (move (v)),
@@ -473,10 +487,15 @@ namespace build2
fmt,
fl.second).first);
- if (!s.empty ())
+ if (copy_empty || !s.empty ())
{
- if (!rs.empty () && delim)
- rs.append (*delim);
+ if (delim)
+ {
+ if (first)
+ first = false;
+ else
+ rs.append (*delim);
+ }
rs.append (s);
}
@@ -677,8 +696,9 @@ namespace build2
// $regex.split(<val>, <pat>, <fmt> [, <flags>])
//
// Split a value of an arbitrary type into a list of unmatched value parts
- // and replacements of the matched parts, omitting empty ones. Convert the
- // value to string prior to matching.
+ // and replacements of the matched parts, omitting empty ones (unless the
+ // format_copy_empty flag is specified). Convert the value to string prior
+ // to matching.
//
// Substitution escape sequences are extended with a subset of Perl
// sequences (see libbutl/regex.hxx for details).
@@ -689,6 +709,8 @@ namespace build2
//
// format_no_copy - do not copy unmatched value parts into the result
//
+ // format_copy_empty - copy empty elements into the result
+ //
f[".split"] += [](value s, string re, string fmt, optional<names> flags)
{
return split (move (s), re, fmt, move (flags));
@@ -707,7 +729,8 @@ namespace build2
// Replace matched parts in a list of elements using the regex format
// string. Convert the elements to string prior to matching. The result
// value is untyped and contains concatenation of transformed non-empty
- // elements optionally separated with a delimiter.
+ // elements (unless the format_copy_empty flag is specified) optionally
+ // separated with a delimiter.
//
// Substitution escape sequences are extended with a subset of Perl
// sequences (see libbutl/regex.hxx for details).
@@ -720,6 +743,8 @@ namespace build2
//
// format_no_copy - do not copy unmatched value parts into the result
//
+ // format_copy_empty - copy empty elements into the result
+ //
// If both format_first_only and format_no_copy flags are specified then
// the result will be a concatenation of only the first match
// replacements.
@@ -727,23 +752,29 @@ namespace build2
f[".merge"] += [](names s,
string re,
string fmt,
- optional<string> delim,
+ optional<string*> delim,
optional<names> flags)
{
- return merge (move (s), re, fmt, move (delim), move (flags));
+ return merge (move (s),
+ re,
+ fmt,
+ delim && *delim != nullptr
+ ? move (**delim)
+ : optional<string> (),
+ move (flags));
};
f[".merge"] += [](names s,
names re,
names fmt,
- optional<names> delim,
+ optional<names*> delim,
optional<names> flags)
{
return merge (move (s),
convert<string> (move (re)),
convert<string> (move (fmt)),
- delim
- ? convert<string> (move (*delim))
+ delim && *delim != nullptr
+ ? convert<string> (move (**delim))
: optional<string> (),
move (flags));
};
@@ -752,7 +783,8 @@ namespace build2
//
// Replace matched parts of each element in a list using the regex format
// string. Convert the elements to string prior to matching. Return a list
- // of transformed elements, omitting the empty ones.
+ // of transformed elements, omitting the empty ones (unless the
+ // format_copy_empty flag is specified).
//
// Substitution escape sequences are extended with a subset of Perl
// sequences (see libbutl/regex.hxx for details).
@@ -765,6 +797,8 @@ namespace build2
//
// format_no_copy - do not copy unmatched value parts into the result
//
+ // format_copy_empty - copy empty elements into the result
+ //
// If both format_first_only and format_no_copy flags are specified then
// the result elements will only contain the replacement of the first
// match.