diff options
Diffstat (limited to 'src/unit.c')
| -rw-r--r-- | src/unit.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/src/unit.c b/src/unit.c new file mode 100644 index 0000000..f7c0277 --- /dev/null +++ b/src/unit.c @@ -0,0 +1,212 @@ +/* + * 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); +} |