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authorKaren Arutyunov <karen@codesynthesis.com>2019-11-07 13:51:08 +0300
committerBoris Kolpackov <boris@codesynthesis.com>2019-11-08 08:48:08 +0200
commit30e991722c35e15c1343cc8772c69a00a5e06d96 (patch)
tree07a4782021b11e364c7fcff89f0fff5f4e41c0c3 /libbuild2/functions-regex.cxx
parentc1d9c1a0db041def6a3bc9b19be9f14a75b72c1a (diff)
Add $regex.replace_lines() function
Diffstat (limited to 'libbuild2/functions-regex.cxx')
-rw-r--r--libbuild2/functions-regex.cxx143
1 files changed, 141 insertions, 2 deletions
diff --git a/libbuild2/functions-regex.cxx b/libbuild2/functions-regex.cxx
index b0472ed..90a7c56 100644
--- a/libbuild2/functions-regex.cxx
+++ b/libbuild2/functions-regex.cxx
@@ -61,7 +61,7 @@ namespace build2
if (flags)
{
- for (auto& f: *flags)
+ for (name& f: *flags)
{
string s (convert<string> (move (f)));
@@ -223,12 +223,106 @@ namespace build2
}
catch (const regex_error& e)
{
+ // Print regex_error description if meaningful (no space).
+ //
fail << "unable to replace" << e;
}
return r;
}
+ // Replace matched parts in lines using the format string. See
+ // replace_lines() overloads (below) for details.
+ //
+ static names
+ replace_lines (value&& v,
+ const string& re,
+ const optional<string>& fmt,
+ optional<names>&& flags)
+ {
+ string s (to_string (move (v)));
+
+ // Extract the return_lines flag, if present, and parse the remaining
+ // flags using parse_replacement_flags().
+ //
+ bool rls (false);
+
+ if (flags)
+ {
+ names& fs (*flags);
+ const name rlf ("return_lines");
+
+ for (names::const_iterator i (fs.begin ()); i != fs.end (); )
+ {
+ if (*i == rlf)
+ {
+ rls = true;
+ i = fs.erase (i);
+ }
+ else
+ ++i;
+ }
+ }
+
+ auto fl (parse_replacement_flags (move (flags)));
+ regex rge (parse_regex (re, fl.first));
+
+ names r;
+ string ls;
+
+ try
+ {
+ istringstream is (s);
+ is.exceptions (istringstream::badbit);
+
+ const string& efmt (fmt ? *fmt : "");
+
+ for (string l; !eof (getline (is, l)); )
+ {
+ auto rr (regex_replace_search (l, rge, efmt, fl.second));
+ string& s (rr.first);
+
+ // Skip the empty replacement for a matched line if the format is
+ // absent.
+ //
+ if (!fmt && rr.second && s.empty ())
+ continue;
+
+ if (!rls)
+ r.emplace_back (to_name (move (s)));
+ else
+ {
+ if (ls.empty ())
+ ls = move (s);
+ else
+ ls += s;
+
+ // Append the trailing newline for the added line if EOS is not
+ // reached, which indicates that the original line is terminated
+ // with newline.
+ //
+ if (!is.eof ())
+ ls += '\n';
+ }
+ }
+ }
+ catch (const regex_error& e)
+ {
+ // Print regex_error description if meaningful (no space).
+ //
+ fail << "unable to replace lines" << e;
+ }
+ catch (const io_error& e)
+ {
+ fail << "unable to read lines: " << e;
+ }
+
+ if (rls)
+ r.push_back (move (ls));
+
+ return r;
+ }
+
// Split a value of an arbitrary type into a list of unmatched value parts
// and replacements of the matched parts. See split() overloads (below) for
// details.
@@ -257,6 +351,8 @@ namespace build2
}
catch (const regex_error& e)
{
+ // Print regex_error description if meaningful (no space).
+ //
fail << "unable to split" << e;
}
@@ -292,6 +388,8 @@ namespace build2
}
catch (const regex_error& e)
{
+ // Print regex_error description if meaningful (no space).
+ //
fail << "unable to apply" << e;
}
@@ -335,6 +433,8 @@ namespace build2
}
catch (const regex_error& e)
{
+ // Print regex_error description if meaningful (no space).
+ //
fail << "unable to merge" << e;
}
@@ -389,7 +489,7 @@ namespace build2
// sub-string that matches the whole regular expression and
// NULL if no match
//
- // return_subs - return names (rather than boolean), that contain
+ // return_subs - return names (rather than boolean), that contain
// sub-strings that match the marked sub-expressions and
// NULL if no match
//
@@ -439,6 +539,45 @@ namespace build2
move (flags));
};
+ // $regex.replace_lines(<val>, <pat>, <fmt> [, <flags>])
+ //
+ // Convert the value to string, parse it into lines and for each line
+ // apply the $regex.replace() function with the specified pattern, format,
+ // and flags. If the format argument is NULL, omit the "all-NULL"
+ // replacements for the matched lines from the result. Return unmatched
+ // lines and line replacements as a name list unless return_lines flag is
+ // specified (see below), in which case return a single multi-line simple
+ // name value.
+ //
+ // The following flags are supported in addition to the $regex.replace()
+ // function flags:
+ //
+ // return_lines - return the simple name (rather than a name list)
+ // containing the unmatched lines and line replacements
+ // seperated with newlines.
+ //
+ f[".replace_lines"] = [](value s,
+ string re,
+ string fmt,
+ optional<names> flags)
+ {
+ return replace_lines (move (s), re, move (fmt), move (flags));
+ };
+
+ f[".replace_lines"] = [](value s,
+ names re,
+ names* fmt,
+ optional<names> flags)
+ {
+ return replace_lines (
+ move (s),
+ convert<string> (move (re)),
+ (fmt != nullptr
+ ? optional<string> (convert<string> (move (*fmt)))
+ : nullopt),
+ move (flags));
+ };
+
// $regex.split(<val>, <pat>, <fmt> [, <flags>])
//
// Split a value of an arbitrary type into a list of unmatched value parts