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diff --git a/src/unit.c b/src/unit.c
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+/*
+ * Copyright (C) 1987-2008 Sun Microsystems, Inc. All Rights Reserved.
+ * Copyright (C) 2008-2011 Robert Ancell.
+ *
+ * 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 2 of the License, or (at your option) any later
+ * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
+
+#include <string.h>
+
+#include "unit.h"
+#include "mp-serializer.h"
+#include "mp-equation.h"
+#include "currency-manager.h" // FIXME: Move out of here
+
+struct UnitPrivate
+{
+ gchar *name;
+ gchar *display_name;
+ gchar *format;
+ GList *symbols;
+ gchar *from_function;
+ gchar *to_function;
+ MpSerializer *serializer;
+};
+
+G_DEFINE_TYPE (Unit, unit, G_TYPE_OBJECT);
+
+
+Unit *
+unit_new(const gchar *name,
+ const gchar *display_name,
+ const gchar *format,
+ const gchar *from_function,
+ const gchar *to_function,
+ const gchar *symbols)
+{
+ Unit *unit = g_object_new(unit_get_type(), NULL);
+ gchar **symbol_names;
+ int i;
+
+ unit->priv->name = g_strdup(name);
+ unit->priv->display_name = g_strdup(display_name);
+ unit->priv->format = g_strdup(format);
+ unit->priv->from_function = g_strdup(from_function);
+ unit->priv->to_function = g_strdup(to_function);
+ symbol_names = g_strsplit(symbols, ",", 0);
+ for (i = 0; symbol_names[i]; i++)
+ unit->priv->symbols = g_list_append(unit->priv->symbols, g_strdup(symbol_names[i]));
+ g_free(symbol_names);
+
+ return unit;
+}
+
+
+const gchar *
+unit_get_name(Unit *unit)
+{
+ g_return_val_if_fail (unit != NULL, NULL);
+ return unit->priv->name;
+}
+
+
+const gchar *
+unit_get_display_name(Unit *unit)
+{
+ g_return_val_if_fail (unit != NULL, NULL);
+ return unit->priv->display_name;
+}
+
+
+gboolean
+unit_matches_symbol(Unit *unit, const gchar *symbol)
+{
+ GList *iter;
+
+ g_return_val_if_fail (unit != NULL, FALSE);
+ g_return_val_if_fail (symbol != NULL, FALSE);
+
+ for (iter = unit->priv->symbols; iter; iter = iter->next) {
+ gchar *s = iter->data;
+ if (strcmp(s, symbol) == 0)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+const GList *
+unit_get_symbols(Unit *unit)
+{
+ g_return_val_if_fail (unit != NULL, NULL);
+ return unit->priv->symbols;
+}
+
+
+static int
+variable_is_defined(const char *name, void *data)
+{
+ return TRUE;
+}
+
+
+static int
+get_variable(const char *name, MPNumber *z, void *data)
+{
+ MPNumber *x = data;
+ mp_set_from_mp(x, z);
+ return TRUE;
+}
+
+
+static gboolean
+solve_function(const gchar *function, const MPNumber *x, MPNumber *z)
+{
+ MPEquationOptions options;
+ int ret;
+
+ memset(&options, 0, sizeof(options));
+ options.base = 10;
+ options.wordlen = 32;
+ options.variable_is_defined = variable_is_defined;
+ options.get_variable = get_variable;
+ options.callback_data = (void *)x;
+ ret = mp_equation_parse(function, &options, z, NULL);
+ if (ret) {
+ g_warning("Failed to convert value: %s", function);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+
+gboolean
+unit_convert_from(Unit *unit, const MPNumber *x, MPNumber *z)
+{
+ g_return_val_if_fail(unit != NULL, FALSE);
+ g_return_val_if_fail(x != NULL, FALSE);
+ g_return_val_if_fail(x != NULL, FALSE);
+
+ if (unit->priv->from_function)
+ return solve_function(unit->priv->from_function, x, z);
+ else {
+ // FIXME: Hack to make currency work
+ const MPNumber *r;
+ r = currency_manager_get_value(currency_manager_get_default(), unit->priv->name);
+ if (!r)
+ return FALSE;
+ mp_divide(x, r, z);
+
+ return TRUE;
+ }
+}
+
+
+gboolean
+unit_convert_to(Unit *unit, const MPNumber *x, MPNumber *z)
+{
+ g_return_val_if_fail(unit != NULL, FALSE);
+ g_return_val_if_fail(x != NULL, FALSE);
+ g_return_val_if_fail(x != NULL, FALSE);
+
+ if (unit->priv->from_function)
+ return solve_function(unit->priv->to_function, x, z);
+ else {
+ // FIXME: Hack to make currency work
+ const MPNumber *r;
+ r = currency_manager_get_value(currency_manager_get_default(), unit->priv->name);
+ if (!r)
+ return FALSE;
+ mp_multiply(x, r, z);
+
+ return TRUE;
+ }
+}
+
+
+gchar *
+unit_format(Unit *unit, MPNumber *x)
+{
+ gchar *number_text, *text;
+
+ g_return_val_if_fail(unit != NULL, FALSE);
+ g_return_val_if_fail(x != NULL, FALSE);
+
+ number_text = mp_serializer_to_string(unit->priv->serializer, x);
+ text = g_strdup_printf(unit->priv->format, number_text);
+ g_free(number_text);
+
+ return text;
+}
+
+
+static void
+unit_class_init(UnitClass *klass)
+{
+ g_type_class_add_private(klass, sizeof(UnitPrivate));
+}
+
+
+static void
+unit_init(Unit *unit)
+{
+ unit->priv = G_TYPE_INSTANCE_GET_PRIVATE(unit, unit_get_type(), UnitPrivate);
+ unit->priv->serializer = mp_serializer_new(MP_DISPLAY_FORMAT_AUTOMATIC, 10, 2);
+ mp_serializer_set_leading_digits(unit->priv->serializer, 6);
+}