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add tests for float format.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2008-03-05 16:24:09 +00:00
parent 8c889459cf
commit 579f16d985

View file

@ -109,11 +109,12 @@ class TestSprintfComb < Test::Unit::TestCase
VS.reverse!
def combination(*args, &b)
#AllPairs.exhaustive_each(*args, &b)
AllPairs.each(*args, &b)
end
def emu(format, v)
/\A%( )?(\#)?(\+)?(-)?(0)?(\d+)?(?:\.(\d+))?(.)\z/ =~ format
def emu_int(format, v)
/\A%( )?(\#)?(\+)?(-)?(0)?(\d+)?(?:\.(\d*))?(.)\z/ =~ format
sp = $1
hs = $2
pl = $3
@ -263,23 +264,20 @@ class TestSprintfComb < Test::Unit::TestCase
str
end
def test_format
def test_format_integer
combination(
%w[b d o X x],
[nil, 0, 5, 20],
[nil, 0, 8, 20],
["", ".", ".0", ".8", ".20"],
['', ' '],
['', '#'],
['', '+'],
['', '-'],
['', '0']) {|type, width, precision, sp, hs, pl, mi, zr|
if precision
precision = ".#{precision}"
end
format = "%#{sp}#{hs}#{pl}#{mi}#{zr}#{width}#{precision}#{type}"
VS.each {|v|
r = sprintf format, v
e = emu format, v
e = emu_int format, v
if true
assert_equal(e, r, "sprintf(#{format.dump}, #{v})")
else
@ -290,4 +288,261 @@ class TestSprintfComb < Test::Unit::TestCase
}
}
end
FLOAT_VALUES = [
-1e100,
-123456789.0,
-1.0,
-0.0,
0.0,
0.01,
1/3.0,
1.0,
2.0,
9.99999999,
123456789.0,
1e100,
Float::MAX,
Float::MIN,
Float::EPSILON,
1+Float::EPSILON,
#1-Float::EPSILON/2,
10 + Float::EPSILON*10,
10 - Float::EPSILON*5,
1.0/0.0,
-1.0/0.0,
0.0/0.0,
]
def split_float10(v)
if v == 0
if 1/v < 0
sign = -1
v = -v
else
sign = 1
end
else
if v < 0
sign = -1
v = -v
else
sign = 1
end
end
exp = 0
int = v.floor
v -= int
while v != 0
v *= 2
int *= 2
i = v.floor
v -= i
int += i
exp -= 1
end
int *= 5 ** (-exp)
[sign, int, exp]
end
def emu_e(sp, hs, pl, mi, zr, width, precision, type, v, sign, int, exp)
precision = 6 unless precision
if int == 0
if precision == 0 && !hs
result = "0#{type}+00"
else
result = "0." + "0" * precision + "#{type}+00"
end
else
if int < 10**precision
int *= 10**precision
exp -= precision
end
digits = int.to_s.length
discard = digits - (precision+1)
if discard != 0
q, r = int.divmod(10**discard)
if r < 10**discard / 2
int = q
exp += discard
elsif (q+1).to_s.length == q.to_s.length
int = q+1
exp += discard
else
discard += 1
q, r = int.divmod(10**discard)
int = q+1
exp += discard
end
end
ints = int.to_s
frac = ints[1..-1]
result = ints[0,1]
e = exp + frac.length
if precision != 0 || hs
result << "."
if precision != 0
result << frac
end
end
result << type
if e == 0
if v.abs < 1
result << '-00' # glibc 2.7 causes '+00'
else
result << '+00'
end
else
result << sprintf("%+03d", e)
end
result
end
result
end
def emu_f(sp, hs, pl, mi, zr, width, precision, type, sign, int, exp)
precision = 6 unless precision
if int == 0
if precision == 0 && !hs
result = '0'
else
result = '0.' + '0' * precision
end
else
if -precision < exp
int *= 10 ** (precision+exp)
exp = -precision
end
if exp < -precision
discard = -exp - precision
q, r = int.divmod(10**discard)
if 10**discard / 2 <= r
q += 1
end
int = q
exp += discard
end
result = int.to_s
if result.length <= precision
result = '0' * (precision+1 - result.length) + result
end
if precision != 0 || hs
if precision == 0
result << '.'
else
result[-precision,0] = '.'
end
end
end
result
end
def emu_float(format, v)
/\A%( )?(\#)?(\+)?(-)?(0)?(\d+)?(?:\.(\d*))?(.)\z/ =~ format
sp = $1
hs = $2
pl = $3
mi = $4
zr = $5
width = $6
precision = $7
type = $8
width = width.to_i if width
precision = precision.to_i if precision
zr = nil if mi && zr
if v.infinite?
sign = v < 0 ? -1 : 1
int = :inf
hs = zr = nil
elsif v.nan?
sign = 1
int = :nan
hs = zr = nil
else
sign, int, exp = split_float10(v)
end
if sign < 0
sign = '-'
elsif sign == 0
sign = ''
elsif pl
sign = '+'
elsif sp
sign = ' '
else
sign = ''
end
if v.nan?
result = 'NaN'
elsif v.infinite?
result = 'Inf'
else
case type
when /[eE]/
result = emu_e(sp, hs, pl, mi, zr, width, precision, type, v, sign, int, exp)
when /f/
result = emu_f(sp, hs, pl, mi, zr, width, precision, type, sign, int, exp)
when /[gG]/
precision = 6 unless precision
precision = 1 if precision == 0
r = emu_e(sp, hs, pl, mi, zr, width, precision-1, type.tr('gG', 'eE'), v, sign, int, exp)
/[eE]([+-]\d+)/ =~ r
e = $1.to_i
if e < -4 || precision <= e
result = r
else
result = emu_f(sp, hs, pl, mi, zr, width, precision-1-e, type, sign, int, exp)
end
result.sub!(/\.[0-9]*/) { $&.sub(/\.?0*\z/, '') } if !hs
else
raise "unexpected type: #{type}"
end
end
pad = ''
if width && sign.length + result.length < width
if zr
pad = '0' * (width - sign.length - result.length)
else
pad = ' ' * (width - sign.length - result.length)
end
end
if mi
sign + result + pad
elsif zr
sign + pad + result
else
pad + sign + result
end
end
def test_format_float
combination(
%w[e E f g G],
[nil, 0, 5, 20],
["", ".", ".0", ".8", ".20", ".200"],
['', ' '],
['', '#'],
['', '+'],
['', '-'],
['', '0']) {|type, width, precision, sp, hs, pl, mi, zr|
format = "%#{sp}#{hs}#{pl}#{mi}#{zr}#{width}#{precision}#{type}"
FLOAT_VALUES.each {|v|
r = sprintf format, v
e = emu_float format, v
if true
assert_equal(e, r, "sprintf(#{format.dump}, #{'%.20g' % v})")
else
if e != r
puts "#{e.dump}\t#{r.dump}\tsprintf(#{format.dump}, #{'%.20g' % v})"
end
end
}
}
end
end