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[ruby/bigdecimal] Add BigDecimal#precision_scale

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c019caeaba
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Kenta Murata 2021-12-02 17:06:52 +09:00
parent ea713009ba
commit 84ae7a5df9
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2 changed files with 30 additions and 0 deletions
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19
ext/bigdecimal/bigdecimal.c
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@ -481,6 +481,24 @@ BigDecimal_scale(VALUE self)
return SSIZET2NUM(scale);
}
/*
* call-seq:
* precision_scale -> [integer, integer]
*
* Returns a 2-length array; the first item is the result of
* BigDecimal#precision and the second one is of BigDecimal#scale.
*
* See BigDecimal#precision.
* See BigDecimal#scale.
*/
static VALUE
BigDecimal_precision_scale(VALUE self)
{
ssize_t precision, scale;
BigDecimal_count_precision_and_scale(self, &precision, &scale);
return rb_assoc_new(SSIZET2NUM(precision), SSIZET2NUM(scale));
}
/*
* call-seq:
* n_significant_digits -> integer
@ -4228,6 +4246,7 @@ Init_bigdecimal(void)
rb_define_method(rb_cBigDecimal, "precs", BigDecimal_prec, 0);
rb_define_method(rb_cBigDecimal, "precision", BigDecimal_precision, 0);
rb_define_method(rb_cBigDecimal, "scale", BigDecimal_scale, 0);
rb_define_method(rb_cBigDecimal, "precision_scale", BigDecimal_precision_scale, 0);
rb_define_method(rb_cBigDecimal, "n_significant_digits", BigDecimal_n_significant_digits, 0);
rb_define_method(rb_cBigDecimal, "add", BigDecimal_add2, 2);

11
test/bigdecimal/test_bigdecimal.rb
View file

@ -2123,6 +2123,17 @@ class TestBigDecimal < Test::Unit::TestCase
end
end
def test_precision_scale
assert_equal([2, 0], BigDecimal("11.0").precision_scale)
assert_equal([2, 1], BigDecimal("1.1").precision_scale)
assert_equal([2, 2], BigDecimal("0.11").precision_scale)
BigDecimal.save_exception_mode do
BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false)
assert_equal([0, 0], BigDecimal("Infinity").precision_scale)
end
end
def test_n_significant_digits_only_integer
assert_equal(0, BigDecimal(0).n_significant_digits)
assert_equal(1, BigDecimal(1).n_significant_digits)