From dc32c58499caa8b1ec4e975afad75ca0d862e990 Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@users.sourceforge.net>
Date: Sat, 13 Sep 2014 20:37:57 +0200
Subject: Introduce properties table

This is a new internal properties storage for attributes that can be
defined both in the item and album scope, with the item scope taking
priority.

The big advantage is a better distinguishment from an undefined, default
value. It also makes easier to retrieve attributes with properly defined
scope priorities.
---
 src/xml-parser.c | 74 ++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 58 insertions(+), 16 deletions(-)

(limited to 'src/xml-parser.c')

diff --git a/src/xml-parser.c b/src/xml-parser.c
index 9f95cf3..a13e502 100644
--- a/src/xml-parser.c
+++ b/src/xml-parser.c
@@ -158,13 +158,13 @@ xml_file_get_node_value_with_default (TXMLFile *file, const gchar *x_path, const
   gchar *s;
 
   s = xml_file_get_node_value (file, x_path);
-
   return s ? s : g_strdup (_default);
 }
 
 
 /*
  *   xml_file_get_node_attribute: retrieve attribute value from XPath node
+ *     - returns NULL if node is not present
  */
 gchar *
 xml_file_get_node_attribute (TXMLFile *file, const gchar *x_path, const gchar *attr)
@@ -198,35 +198,67 @@ xml_file_get_node_attribute (TXMLFile *file, const gchar *x_path, const gchar *a
   return attrv;
 }
 
-long int
-xml_file_get_node_attribute_long (TXMLFile *file, const gchar *x_path, const gchar *attr, const int _default)
+gchar *
+xml_file_get_node_attribute_with_default (TXMLFile *file, const gchar *x_path, const gchar *attr, const gchar *_default)
+{
+  gchar *s = xml_file_get_node_attribute (file, x_path, attr);
+  return s != NULL ? s : g_strdup (_default);
+}
+
+/*
+ *   xml_file_get_node_attribute_*: retrieve attribute value from XPath node, storing it in *value, returning TRUE if value has been set.
+ */
+gboolean
+xml_file_get_node_attribute_long (TXMLFile *file, const gchar *x_path, const gchar *attr, long int *value)
 {
   gchar *s;
   long int i;
+  char *endptr = NULL;
 
   s = xml_file_get_node_attribute (file, x_path, attr);
   if (s == NULL)
-    return _default;
+    return FALSE;
 
-  i = atol (s);
+  i = strtol (s, &endptr, 10);
+  if (endptr != NULL && *endptr != '\0') {
+    g_free (s);
+    return FALSE;
+  }
   g_free (s);
-  return i;
+  *value = i;
+  return TRUE;
+}
+
+long int
+xml_file_get_node_attribute_long_with_default (TXMLFile *file, const gchar *x_path, const gchar *attr, const long int _default)
+{
+  long int i;
+  return xml_file_get_node_attribute_long (file, x_path, attr, &i) ? i : _default;
 }
 
 gboolean
-xml_file_get_node_attribute_boolean (TXMLFile *file, const gchar *x_path, const gchar *attr, const gboolean _default)
+xml_file_get_node_attribute_boolean (TXMLFile *file, const gchar *x_path, const gchar *attr, gboolean *value)
 {
   gchar *s;
-  gboolean b;
 
   s = xml_file_get_node_attribute (file, x_path, attr);
-  b = s ? (strcasecmp (s, "yes") == 0 || strcasecmp (s, "true") == 0) : _default;
+  if (s == NULL)
+    return FALSE;
+
+  *value = (strcasecmp (s, "yes") == 0 || strcasecmp (s, "true") == 0);
   g_free (s);
-  return b;
+  return TRUE;
 }
 
-double
-xml_file_get_node_attribute_double (TXMLFile *file, const gchar *x_path, const gchar *attr, const double _default)
+gboolean
+xml_file_get_node_attribute_boolean_with_default (TXMLFile *file, const gchar *x_path, const gchar *attr, const gboolean _default)
+{
+  gboolean b;
+  return xml_file_get_node_attribute_boolean (file, x_path, attr, &b) ? b : _default;
+}
+
+gboolean
+xml_file_get_node_attribute_double (TXMLFile *file, const gchar *x_path, const gchar *attr, double *value)
 {
   gchar *s;
   double d;
@@ -234,13 +266,23 @@ xml_file_get_node_attribute_double (TXMLFile *file, const gchar *x_path, const g
 
   s = xml_file_get_node_attribute (file, x_path, attr);
   if (s == NULL)
-    return _default;
+    return FALSE;
 
   d = strtod (s, &endptr);
-  if (endptr != NULL && *endptr != '\0')
-    d = _default;
+  if (endptr != NULL && *endptr != '\0') {
+    g_free (s);
+    return FALSE;
+  }
   g_free (s);
-  return d;
+  *value = d;
+  return TRUE;
+}
+
+double
+xml_file_get_node_attribute_double_with_default (TXMLFile *file, const gchar *x_path, const gchar *attr, const double _default)
+{
+  double d;
+  return xml_file_get_node_attribute_double (file, x_path, attr, &d) ? d : _default;
 }
 
 
-- 
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