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authorBoris Kolpackov <boris@codesynthesis.com>2022-05-22 14:56:49 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2022-05-22 14:56:49 +0200
commit0347acdf4c96c2d78d173c84adae99187887be62 (patch)
treeb622acb6e1419deecbec3d17a2243f5cb3f7cb78 /libbuild2/config
parent026c827b978761bf0cb618ff9429df8508cd3190 (diff)
Add support for variable patterns in config.config.disfigure
Diffstat (limited to 'libbuild2/config')
-rw-r--r--libbuild2/config/init.cxx121
1 files changed, 116 insertions, 5 deletions
diff --git a/libbuild2/config/init.cxx b/libbuild2/config/init.cxx
index 73c9d37..e921657 100644
--- a/libbuild2/config/init.cxx
+++ b/libbuild2/config/init.cxx
@@ -261,6 +261,21 @@ namespace build2
// implementation undefined them after loading config.build). See also
// config.config.unload.
//
+ // Besides names, variables can also be specified as patterns in the
+ // config.<prefix>.(*|**)[<suffix>] form where `*` matches single
+ // component names (i.e., `foo` but not `foo.bar`), and `**` matches
+ // single and multi-component names. Currently only single wildcard (`*`
+ // or `**`) is supported. Additionally, a pattern in the
+ // config.<prefix>(*|**) form (i.e., without `.` after <prefix>) matches
+ // config.<prefix>.(*|**) plus config.<prefix> itself (but not
+ // config.<prefix>foo).
+ //
+ // For example, to disfigure all the project configuration variables
+ // (while preserving all the module configuration variables; note
+ // quoting to prevent pattern expansion):
+ //
+ // b config.config.disfigure="'config.hello**'"
+ //
// Note that this variable is not saved in config.build and is expected
// to always be specified as a command line override.
//
@@ -477,16 +492,112 @@ namespace build2
// Undefine variables specified with config.config.disfigure.
//
- if (const strings* vs = cast_null<strings> (rs[c_d]))
+ if (const strings* ns = cast_null<strings> (rs[c_d]))
{
- for (const string& v: *vs)
+ auto p (rs.vars.lookup_namespace ("config"));
+
+ for (auto i (p.first); i != p.second; )
{
- // An unknown variable can't possibly be defined.
+ const variable& var (i->first);
+
+ // This can be one of the overrides (__override, __prefix, etc),
+ // which we skip.
//
- if (const variable* var = vp.find (v))
+ if (!var.override ())
{
- rs.vars.erase (*var); // Undefine.
+ bool m (false);
+
+ for (const string& n: *ns)
+ {
+ if (n.compare (0, 7, "config.") != 0)
+ fail << "config.* variable expected in "
+ << "config.config.disfigure instead of '" << n << "'";
+
+ size_t p (n.find ('*'));
+
+ if (p == string::npos)
+ {
+ if ((m = var.name == n))
+ break;
+ }
+ else
+ {
+ // Pattern in one of these forms:
+ //
+ // config.<prefix>.(*|**)[<suffix>]
+ // config.<prefix>(*|**)
+ //
+ // BTW, an alternative way to handle this would be to
+ // translate it to a path and use our path_match() machinery,
+ // similar to how we do it for build config include/exclude.
+ // Perhaps one day when/if we decide to support multiple
+ // wildcards.
+ //
+ if (p == 7)
+ fail << "config.<prefix>* pattern expected in "
+ << "config.config.disfigure instead of '" << n << "'";
+
+ bool r (n[p + 1] == '*'); // Recursive.
+
+ size_t pe; // Prefix end/size.
+ if (n[p - 1] != '.')
+ {
+ // Second form should have no suffix.
+ //
+ if (p + (r ? 2 : 1) != n.size ())
+ fail << "config.<prefix>(*|**) pattern expected in "
+ << "config.config.disfigure instead of '" << n << "'";
+
+ // Match just <prefix>.
+ //
+ if ((m = n.compare (0, p, var.name) == 0))
+ break;
+
+ pe = p;
+ }
+ else
+ pe = p - 1;
+
+ // Match <prefix> followed by `.`.
+ //
+ if (n.compare (0, pe, var.name, 0, pe) != 0 ||
+ var.name[pe] != '.')
+ continue;
+
+ // Match suffix.
+ //
+ size_t sb (p + (r ? 2 : 1)); // Suffix begin.
+ size_t sn (n.size () - sb); // Suffix size.
+
+ size_t te; // Stem end.
+ if (sn == 0) // No suffix.
+ te = var.name.size ();
+ else
+ {
+ if (var.name.size () < pe + 1 + sn) // Too short.
+ continue;
+
+ te = var.name.size () - sn;
+
+ if (n.compare (sb, sn, var.name, te, sn) != 0)
+ continue;
+ }
+
+ // Match stem.
+ //
+ if ((m = r || var.name.find ('.', pe + 1) >= te))
+ break;
+ }
+ }
+
+ if (m)
+ {
+ i = rs.vars.erase (i); // Undefine.
+ continue;
+ }
}
+
+ ++i;
}
}