preparation for tree simplification

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/src/mds-kbdc/simplify-tree.c b/src/mds-kbdc/simplify-tree.c
new file mode 100644
index 0000000..8a20caa
--- /dev/null
+++ b/src/mds-kbdc/simplify-tree.c
@@ -0,0 +1,77 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "simplify-tree.h"
+
+#include <libmdsserver/macros.h>
+
+
+/**
+ * Add an error the to error list
+ * 
+ * @param  ERROR_IS_IN_FILE:int  Whether the error is in the layout code
+ * @param  SEVERITY:identifier   * in `MDS_KBDC_PARSE_ERROR_*` to indicate severity
+ * @param  ...:const char*, ...  Error description format string and arguments
+ */
+#define NEW_ERROR(ERROR_IS_IN_FILE, SEVERITY, ...)						\
+  do												\
+    {												\
+      if (errors_ptr + 1 >= errors_size)							\
+	{											\
+	  errors_size = errors_size ? (errors_size << 1) : 2;					\
+	  fail_if (xxrealloc(old_errors, *errors, errors_size, mds_kbdc_parse_error_t*));	\
+	}											\
+      fail_if (xcalloc(error, 1, mds_kbdc_parse_error_t));					\
+      (*errors)[errors_ptr + 0] = error;							\
+      (*errors)[errors_ptr + 1] = NULL;								\
+      errors_ptr++;										\
+      error->line  = line_i;									\
+      error->severity = MDS_KBDC_PARSE_ERROR_##SEVERITY;					\
+      error->error_is_in_file = ERROR_IS_IN_FILE;						\
+      error->start = (size_t)(line - LINE);							\
+      error->end   = (size_t)(end  - LINE);							\
+      fail_if ((error->pathname = strdup(pathname)) == NULL);					\
+      if (ERROR_IS_IN_FILE)									\
+	fail_if ((error->code = strdup(source_code.real_lines[line_i])) == NULL);		\
+      fail_if (xasprintf(error->description, __VA_ARGS__));					\
+    }												\
+   while (0)
+
+
+
+/**
+ * Simplify a tree and generate related warnings in the process
+ * 
+ * @param   tree    The tree, it may be modified
+ * @param   errors  `NULL`-terminated list of found error, `NULL` if no errors were found or if -1 is returned
+ * @return          -1 if an error occursed that cannot be stored in `*errors`, zero otherwise
+ */
+int simplify_tree(mds_kbdc_tree_t** restrict tree, mds_kbdc_parse_error_t*** restrict errors)
+{
+  mds_kbdc_parse_error_t* error;
+  mds_kbdc_parse_error_t** old_errors = NULL;
+  size_t errors_size = 0;
+  size_t errors_ptr = 0;
+  
+  *errors = NULL;
+  
+  return 0;
+}
+
+
+#undef NEW_ERROR
+