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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_WITH_PRIVATE (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, 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(z != 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)
{
}
static void
unit_init(Unit *unit)
{
unit->priv = unit_get_instance_private (unit);
unit->priv->serializer = mp_serializer_new(MP_DISPLAY_FORMAT_AUTOMATIC, 10, 2);
mp_serializer_set_leading_digits(unit->priv->serializer, 6);
}
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