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# The example numbers in these specs are ported from the C++
# "double-conversions" library. The following is their license:
# Copyright 2012 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
require "spec"
private def test_grisu(v : UInt64)
test_grisu v.unsafe_as(Float64)
end
private def test_grisu(v : UInt32)
test_grisu v.unsafe_as(Float32)
end
private def test_grisu(v : Float64 | Float32)
buffer = StaticArray(UInt8, 128).new(0_u8)
status, decimal_exponent, length = Float::Printer::Grisu3.grisu3(v, buffer.to_unsafe)
point = decimal_exponent + length
return status, point, String.new(buffer.to_unsafe)
end
describe "grisu3" do
context "float64" do
it "min float" do
status, point, str = test_grisu 5e-324
status.should eq true
str.should eq "5"
point.should eq -323
end
it "max float" do
status, point, str = test_grisu 1.7976931348623157e308
status.should eq true
str.should eq "17976931348623157"
point.should eq 309
end
it "point at end" do
status, point, str = test_grisu 4294967272.0
status.should eq true
str.should eq "4294967272"
point.should eq 10
end
it "large number" do
status, point, str = test_grisu 4.1855804968213567e298
status.should eq true
str.should eq "4185580496821357"
point.should eq 299
end
it "small number" do
status, point, str = test_grisu 5.5626846462680035e-309
status.should eq true
str.should eq "5562684646268003"
point.should eq -308
end
it "another no point move" do
status, point, str = test_grisu 2147483648.0
status.should eq true
str.should eq "2147483648"
point.should eq 10
end
it "failure case" do
# grisu should not be able to do this number
# this number is reused to ensure the fallback works
status, point, str = test_grisu 3.5844466002796428e+298
status.should eq false
str.should_not eq "35844466002796428"
end
it "smallest normal" do
status, point, str = test_grisu 0x0010000000000000_u64
status.should eq true
str.should eq "22250738585072014"
point.should eq -307
end
it "largest denormal" do
status, point, str = test_grisu 0x000FFFFFFFFFFFFF_u64
status.should eq true
str.should eq "2225073858507201"
point.should eq -307
end
end
context "float32" do
it "min" do
status, point, str = test_grisu 1e-45_f32
status.should eq true
str.should eq "1"
point.should eq -44
end
it "max" do
status, point, str = test_grisu 3.4028234e38_f32
status.should eq true
str.should eq "34028235"
point.should eq 39
end
it "general whole number, rounding" do
status, point, str = test_grisu 4294967272.0_f32
status.should eq true
str.should eq "42949673"
point.should eq 10
end
it "general whole number, rounding" do
status, point, str = test_grisu 4294967272.0_f32
status.should eq true
str.should eq "42949673"
point.should eq 10
end
it "large number, rounding" do
status, point, str = test_grisu 3.32306998946228968226e35_f32
status.should eq true
str.should eq "332307"
point.should eq 36
end
it "small number" do
status, point, str = test_grisu 1.2341e-41_f32
status.should eq true
str.should eq "12341"
point.should eq -40
end
it "general no rounding" do
status, point, str = test_grisu 3.3554432e7_f32
status.should eq true
str.should eq "33554432"
point.should eq 8
end
it "general with rounding up" do
status, point, str = test_grisu 3.26494756798464e14_f32
status.should eq true
str.should eq "32649476"
point.should eq 15
end
it "general with rounding down" do
status, point, str = test_grisu 3.91132223637771935344e37_f32
status.should eq true
str.should eq "39113222"
point.should eq 38
end
it "smallest normal" do
status, point, str = test_grisu 0x00800000_u32
status.should eq true
str.should eq "11754944"
point.should eq -37
end
it "largest denormal" do
status, point, str = test_grisu 0x007FFFFF_u32
status.should eq true
str.should eq "11754942"
point.should eq -37
end
end
end
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