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#include "services/quick-answers/math.h"
struct _FoobarMathExpression
{
FoobarMathExpressionType type;
union
{
struct
{
FoobarMathValue v;
} value;
struct
{
FoobarMathFunction f;
FoobarMathExpression* input;
} function;
struct
{
FoobarMathConstant c;
} constant;
struct
{
FoobarMathOperation o;
FoobarMathExpression* lhs;
FoobarMathExpression* rhs;
} operation;
};
};
FoobarMathExpression* foobar_math_expression_value( FoobarMathValue value )
{
FoobarMathExpression* res = g_new0( FoobarMathExpression, 1 );
res->type = FOOBAR_MATH_EXPRESSION_VALUE;
res->value.v = value;
return res;
}
FoobarMathExpression* foobar_math_expression_function(
FoobarMathFunction function,
FoobarMathExpression* input )
{
FoobarMathExpression* res = g_new0( FoobarMathExpression, 1 );
res->type = FOOBAR_MATH_EXPRESSION_FUNCTION;
res->function.f = function;
res->function.input = input;
return res;
}
FoobarMathExpression* foobar_math_expression_constant( FoobarMathConstant constant )
{
FoobarMathExpression* res = g_new0( FoobarMathExpression, 1 );
res->type = FOOBAR_MATH_EXPRESSION_CONSTANT;
res->constant.c = constant;
return res;
}
FoobarMathExpression* foobar_math_expression_operation(
FoobarMathOperation operation,
FoobarMathExpression* lhs,
FoobarMathExpression* rhs )
{
FoobarMathExpression* res = g_new0( FoobarMathExpression, 1 );
res->type = FOOBAR_MATH_EXPRESSION_OPERATION;
res->operation.o = operation;
res->operation.lhs = lhs;
res->operation.rhs = rhs;
return res;
}
void foobar_math_expression_free( FoobarMathExpression* expression )
{
if ( expression )
{
switch ( expression->type )
{
case FOOBAR_MATH_EXPRESSION_VALUE:
foobar_math_value_free( expression->value.v );
break;
case FOOBAR_MATH_EXPRESSION_FUNCTION:
foobar_math_expression_free( expression->function.input );
break;
case FOOBAR_MATH_EXPRESSION_CONSTANT:
break;
case FOOBAR_MATH_EXPRESSION_OPERATION:
foobar_math_expression_free( expression->operation.lhs );
foobar_math_expression_free( expression->operation.rhs );
break;
default:
g_warn_if_reached( );
break;
}
g_free( expression );
}
}
void foobar_math_expression_print(
FoobarMathExpression const* expr,
gint indentation )
{
for (gint i = 0; i < indentation; ++i) { g_print("| "); }
switch ( expr->type )
{
case FOOBAR_MATH_EXPRESSION_VALUE:
{
g_autofree gchar* val = foobar_math_value_format( expr->value.v );
g_print( "%s\n", val );
break;
}
case FOOBAR_MATH_EXPRESSION_FUNCTION:
switch ( expr->function.f )
{
case FOOBAR_MATH_FUNCTION_NEGATE:
g_print( "-\n" );
break;
case FOOBAR_MATH_FUNCTION_SIN:
g_print( "sin\n" );
break;
case FOOBAR_MATH_FUNCTION_COS:
g_print( "cos\n" );
break;
case FOOBAR_MATH_FUNCTION_SEC:
g_print( "sec\n" );
break;
case FOOBAR_MATH_FUNCTION_CSC:
g_print( "csc\n" );
break;
case FOOBAR_MATH_FUNCTION_TAN:
g_print( "tan\n" );
break;
case FOOBAR_MATH_FUNCTION_COT:
g_print( "cot\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCSIN:
g_print( "arcsin\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCCOS:
g_print( "arccos\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCSEC:
g_print( "arcsec\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCCSC:
g_print( "arccsc\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCTAN:
g_print( "arctan\n" );
break;
case FOOBAR_MATH_FUNCTION_ARCCOT:
g_print( "arccot\n" );
break;
case FOOBAR_MATH_FUNCTION_EXP:
g_print( "exp\n" );
break;
case FOOBAR_MATH_FUNCTION_SQRT:
g_print( "sqrt\n" );
break;
default:
g_warn_if_reached( );
break;
}
foobar_math_expression_print( expr->function.input, indentation + 1 );
break;
case FOOBAR_MATH_EXPRESSION_CONSTANT:
switch ( expr->constant.c )
{
case FOOBAR_MATH_CONSTANT_PI:
g_print( "pi\n" );
break;
case FOOBAR_MATH_CONSTANT_E:
g_print( "e\n" );
break;
default:
g_warn_if_reached( );
break;
}
break;
case FOOBAR_MATH_EXPRESSION_OPERATION:
switch ( expr->operation.o )
{
case FOOBAR_MATH_OPERATION_ADD:
g_print( "+\n" );
break;
case FOOBAR_MATH_OPERATION_SUB:
g_print( "-\n" );
break;
case FOOBAR_MATH_OPERATION_MUL:
g_print( "*\n" );
break;
case FOOBAR_MATH_OPERATION_DIV:
g_print( "/\n" );
break;
case FOOBAR_MATH_OPERATION_POW:
g_print( "^\n" );
break;
default:
g_warn_if_reached( );
break;
}
foobar_math_expression_print( expr->operation.lhs, indentation + 1 );
foobar_math_expression_print( expr->operation.rhs, indentation + 1 );
break;
default:
g_warn_if_reached( );
break;
}
}
gboolean foobar_math_value_from_string(
gchar const* input,
gsize input_length,
FoobarMathValue* out_value )
{
g_autofree gchar* without_sep = g_new0( gchar, input_length + 1 );
gsize sep_pos = input_length - 1;
gsize j = 0;
for ( gsize i = 0; i < input_length; ++i )
{
if ( input[i] == '.' )
{
sep_pos = i;
}
else
{
without_sep[j++] = input[i];
}
}
out_value->type = FOOBAR_MATH_VALUE_INT;
out_value->int_value.decimal_places = input_length - 1 - sep_pos;
mpz_init( out_value->int_value.v );
if ( mpz_init_set_str( out_value->int_value.v, without_sep, 10 ) == -1 )
{
mpz_clear( out_value->int_value.v );
return FALSE;
}
return TRUE;
}
void foobar_math_value_free( FoobarMathValue value )
{
if ( value.type == FOOBAR_MATH_VALUE_INT )
{
mpz_clear( value.int_value.v );
}
}
gboolean foobar_math_evaluate(
FoobarMathExpression const* expression,
FoobarMathValue* out_value )
{
return FALSE;
}
gchar* foobar_math_value_format( FoobarMathValue value )
{
switch ( value.type )
{
case FOOBAR_MATH_VALUE_INT:
{
size_t len = mpz_sizeinbase( value.int_value.v, 10 );
gchar* result = g_new0( gchar, len + 3 ); // length + null terminator + sign + separator
mpz_get_str( result, 10, value.int_value.v );
len = strlen( result );
gboolean trailing_zeros = TRUE;
gsize decimal_places = value.int_value.decimal_places;
gsize actual_decimal_places = decimal_places;
for ( gsize i = 0; i < decimal_places; ++i )
{
if ( trailing_zeros && result[len - 1 - i] == '0' )
{
result[len - 1 - i] = '\0';
actual_decimal_places -= 1;
}
else
{
trailing_zeros = FALSE;
}
}
if ( actual_decimal_places > 0 )
{
memmove( &result[len + 1 - decimal_places], &result[len - decimal_places],decimal_places + 1 );
result[len - decimal_places] = '.';
}
return result;
}
case FOOBAR_MATH_VALUE_FLOAT:
return g_strdup_printf( "%Lf", value.float_value.v );
default:
g_warn_if_reached( );
return NULL;
}
}
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