aboutsummaryrefslogtreecommitdiff
path: root/src/meta.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/meta.c')
-rw-r--r--src/meta.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/meta.c b/src/meta.c
new file mode 100644
index 0000000..9acc3bb
--- /dev/null
+++ b/src/meta.c
@@ -0,0 +1,127 @@
+/* This file is part of Pies.
+ Copyright (C) 2008, 2009 Sergey Poznyakoff
+
+ Pies is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ Pies is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Pies. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "pies.h"
+#include <c-ctype.h>
+
+static const char *
+meta_expand (struct metadef *def, void *data)
+{
+ if (!def->value)
+ {
+ if (def->expand)
+ return def->expand (def, data);
+ def->value = "INTERNAL ERROR: NONEXPANDABLE DATA";
+ }
+ return def->value;
+}
+
+static const char *
+find_expansion_char (int c, struct metadef *def, void *data)
+{
+ for (; def->kw; def++)
+ if (def->kw[1] == 0 && def->kw[0] == c)
+ return meta_expand (def, data);
+ return NULL;
+}
+
+static const char *
+find_expansion_word (const char *kw, size_t len,
+ struct metadef *def, void *data)
+{
+ for (; def->kw; def++)
+ if (strlen (def->kw) == len && memcmp (def->kw, kw, len) == 0)
+ return meta_expand (def, data);
+ return NULL;
+}
+
+char *
+meta_expand_string (const char *string, struct metadef *def, void *data)
+{
+ const char *p, *s;
+ char *res;
+ struct obstack stk;
+
+ if (!string)
+ return NULL;
+
+ obstack_init (&stk);
+
+ for (p = string; *p;)
+ {
+ char *e;
+ size_t len = strcspn (p, "$");
+
+ obstack_grow (&stk, p, len);
+ p += len;
+ if (*p == '$')
+ {
+ switch (*++p)
+ {
+ case '$':
+ obstack_grow (&stk, p, 1);
+ p++;
+ break;
+
+ case '{':
+ e = strchr (p + 1, '}');
+ if (e && (s = find_expansion_word (p + 1, e - p - 1, def, data)))
+ {
+ obstack_grow (&stk, s, strlen (s));
+ p = e + 1;
+ }
+ else
+ {
+ obstack_grow (&stk, p - 1, 2);
+ p++;
+ }
+ break;
+
+ default:
+ if ((s = find_expansion_char (*p, def, data)) != NULL)
+ len = strlen (s);
+ else
+ {
+ s = p - 1;
+ len = 1;
+ }
+
+ obstack_grow (&stk, s, len);
+ p++;
+ }
+ }
+ else
+ obstack_grow (&stk, p, 1);
+ }
+ obstack_1grow (&stk, 0);
+ res = xstrdup (obstack_finish (&stk));
+ obstack_free (&stk, NULL);
+ return res;
+}
+
+void
+meta_free (struct metadef *def)
+{
+ for (; def->kw; def++)
+ {
+ if (def->storage)
+ {
+ free (def->storage);
+ def->value = def->storage = NULL;
+ }
+ }
+}
+

Return to:

Send suggestions and report system problems to the System administrator.