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Restore leading zero in exponent for printf("%e") and printf("%g") (
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#14695)
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@straight-shoota
straight-shoota committed Jun 26, 2024
1 parent b08f4a2 commit da33258
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Showing 2 changed files with 112 additions and 104 deletions.
204 changes: 102 additions & 102 deletions spec/std/sprintf_spec.cr
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Original file line number Diff line number Diff line change
Expand Up @@ -411,60 +411,60 @@ describe "::sprintf" do

context "scientific format" do
it "works" do
assert_sprintf "%e", 123.45, "1.234500e+2"
assert_sprintf "%E", 123.45, "1.234500E+2"
assert_sprintf "%e", 123.45, "1.234500e+02"
assert_sprintf "%E", 123.45, "1.234500E+02"

assert_sprintf "%e", Float64::MAX, "1.797693e+308"
assert_sprintf "%e", Float64::MIN_POSITIVE, "2.225074e-308"
assert_sprintf "%e", Float64::MIN_SUBNORMAL, "4.940656e-324"
assert_sprintf "%e", 0.0, "0.000000e+0"
assert_sprintf "%e", -0.0, "-0.000000e+0"
assert_sprintf "%e", 0.0, "0.000000e+00"
assert_sprintf "%e", -0.0, "-0.000000e+00"
assert_sprintf "%e", -Float64::MIN_SUBNORMAL, "-4.940656e-324"
assert_sprintf "%e", -Float64::MIN_POSITIVE, "-2.225074e-308"
assert_sprintf "%e", Float64::MIN, "-1.797693e+308"
end

context "width specifier" do
it "sets the minimum length of the string" do
assert_sprintf "%20e", 123.45, " 1.234500e+2"
assert_sprintf "%20e", -123.45, " -1.234500e+2"
assert_sprintf "%+20e", 123.45, " +1.234500e+2"
assert_sprintf "%20e", 123.45, " 1.234500e+02"
assert_sprintf "%20e", -123.45, " -1.234500e+02"
assert_sprintf "%+20e", 123.45, " +1.234500e+02"

assert_sprintf "%12e", 123.45, " 1.234500e+2"
assert_sprintf "%12e", -123.45, "-1.234500e+2"
assert_sprintf "%+12e", 123.45, "+1.234500e+2"
assert_sprintf "%13e", 123.45, " 1.234500e+02"
assert_sprintf "%13e", -123.45, "-1.234500e+02"
assert_sprintf "%+13e", 123.45, "+1.234500e+02"

assert_sprintf "%11e", 123.45, "1.234500e+2"
assert_sprintf "%11e", -123.45, "-1.234500e+2"
assert_sprintf "%+11e", 123.45, "+1.234500e+2"
assert_sprintf "%12e", 123.45, "1.234500e+02"
assert_sprintf "%12e", -123.45, "-1.234500e+02"
assert_sprintf "%+12e", 123.45, "+1.234500e+02"

assert_sprintf "%2e", 123.45, "1.234500e+2"
assert_sprintf "%2e", -123.45, "-1.234500e+2"
assert_sprintf "%+2e", 123.45, "+1.234500e+2"
assert_sprintf "%2e", 123.45, "1.234500e+02"
assert_sprintf "%2e", -123.45, "-1.234500e+02"
assert_sprintf "%+2e", 123.45, "+1.234500e+02"
end

it "left-justifies on negative width" do
assert_sprintf "%*e", [-20, 123.45], "1.234500e+2 "
assert_sprintf "%*e", [-20, 123.45], "1.234500e+02 "
end
end

context "precision specifier" do
it "sets the minimum length of the fractional part" do
assert_sprintf "%.0e", 2.0, "2e+0"
assert_sprintf "%.0e", 2.5.prev_float, "2e+0"
assert_sprintf "%.0e", 2.5, "2e+0"
assert_sprintf "%.0e", 2.5.next_float, "3e+0"
assert_sprintf "%.0e", 3.0, "3e+0"
assert_sprintf "%.0e", 3.5.prev_float, "3e+0"
assert_sprintf "%.0e", 3.5, "4e+0"
assert_sprintf "%.0e", 3.5.next_float, "4e+0"
assert_sprintf "%.0e", 4.0, "4e+0"
assert_sprintf "%.0e", 2.0, "2e+00"
assert_sprintf "%.0e", 2.5.prev_float, "2e+00"
assert_sprintf "%.0e", 2.5, "2e+00"
assert_sprintf "%.0e", 2.5.next_float, "3e+00"
assert_sprintf "%.0e", 3.0, "3e+00"
assert_sprintf "%.0e", 3.5.prev_float, "3e+00"
assert_sprintf "%.0e", 3.5, "4e+00"
assert_sprintf "%.0e", 3.5.next_float, "4e+00"
assert_sprintf "%.0e", 4.0, "4e+00"

assert_sprintf "%.0e", 9.5, "1e+1"
assert_sprintf "%.0e", 9.5, "1e+01"

assert_sprintf "%.100e", 1.1, "1.1000000000000000888178419700125232338905334472656250000000000000000000000000000000000000000000000000e+0"
assert_sprintf "%.100e", 1.1, "1.1000000000000000888178419700125232338905334472656250000000000000000000000000000000000000000000000000e+00"

assert_sprintf "%.10000e", 1.0, "1.#{"0" * 10000}e+0"
assert_sprintf "%.10000e", 1.0, "1.#{"0" * 10000}e+00"

assert_sprintf "%.1000e", Float64::MIN_POSITIVE.prev_float,
"2.2250738585072008890245868760858598876504231122409594654935248025624400092282356951" \
Expand All @@ -482,103 +482,103 @@ describe "::sprintf" do
end

it "can be used with width" do
assert_sprintf "%20.12e", 123.45, " 1.234500000000e+2"
assert_sprintf "%20.12e", -123.45, " -1.234500000000e+2"
assert_sprintf "%20.12e", 0.0, " 0.000000000000e+0"
assert_sprintf "%20.13e", 123.45, " 1.2345000000000e+02"
assert_sprintf "%20.13e", -123.45, "-1.2345000000000e+02"
assert_sprintf "%20.13e", 0.0, " 0.0000000000000e+00"

assert_sprintf "%-20.12e", 123.45, "1.234500000000e+2 "
assert_sprintf "%-20.12e", -123.45, "-1.234500000000e+2 "
assert_sprintf "%-20.12e", 0.0, "0.000000000000e+0 "
assert_sprintf "%-20.13e", 123.45, "1.2345000000000e+02 "
assert_sprintf "%-20.13e", -123.45, "-1.2345000000000e+02"
assert_sprintf "%-20.13e", 0.0, "0.0000000000000e+00 "

assert_sprintf "%8.12e", 123.45, "1.234500000000e+2"
assert_sprintf "%8.12e", -123.45, "-1.234500000000e+2"
assert_sprintf "%8.12e", 0.0, "0.000000000000e+0"
assert_sprintf "%8.13e", 123.45, "1.2345000000000e+02"
assert_sprintf "%8.13e", -123.45, "-1.2345000000000e+02"
assert_sprintf "%8.13e", 0.0, "0.0000000000000e+00"
end

it "is ignored if precision argument is negative" do
assert_sprintf "%.*e", [-2, 123.45], "1.234500e+2"
assert_sprintf "%.*e", [-2, 123.45], "1.234500e+02"
end
end

context "sharp flag" do
it "prints a decimal point even if no digits follow" do
assert_sprintf "%#.0e", 1.0, "1.e+0"
assert_sprintf "%#.0e", 10000.0, "1.e+4"
assert_sprintf "%#.0e", 1.0, "1.e+00"
assert_sprintf "%#.0e", 10000.0, "1.e+04"
assert_sprintf "%#.0e", 1.0e+23, "1.e+23"
assert_sprintf "%#.0e", 1.0e-100, "1.e-100"
assert_sprintf "%#.0e", 0.0, "0.e+0"
assert_sprintf "%#.0e", -0.0, "-0.e+0"
assert_sprintf "%#.0e", 0.0, "0.e+00"
assert_sprintf "%#.0e", -0.0, "-0.e+00"
end
end

context "plus flag" do
it "writes a plus sign for positive values" do
assert_sprintf "%+e", 123.45, "+1.234500e+2"
assert_sprintf "%+e", -123.45, "-1.234500e+2"
assert_sprintf "%+e", 0.0, "+0.000000e+0"
assert_sprintf "%+e", 123.45, "+1.234500e+02"
assert_sprintf "%+e", -123.45, "-1.234500e+02"
assert_sprintf "%+e", 0.0, "+0.000000e+00"
end

it "writes plus sign after left space-padding" do
assert_sprintf "%+20e", 123.45, " +1.234500e+2"
assert_sprintf "%+20e", -123.45, " -1.234500e+2"
assert_sprintf "%+20e", 0.0, " +0.000000e+0"
assert_sprintf "%+20e", 123.45, " +1.234500e+02"
assert_sprintf "%+20e", -123.45, " -1.234500e+02"
assert_sprintf "%+20e", 0.0, " +0.000000e+00"
end

it "writes plus sign before left zero-padding" do
assert_sprintf "%+020e", 123.45, "+000000001.234500e+2"
assert_sprintf "%+020e", -123.45, "-000000001.234500e+2"
assert_sprintf "%+020e", 0.0, "+000000000.000000e+0"
assert_sprintf "%+020e", 123.45, "+00000001.234500e+02"
assert_sprintf "%+020e", -123.45, "-00000001.234500e+02"
assert_sprintf "%+020e", 0.0, "+00000000.000000e+00"
end
end

context "space flag" do
it "writes a space for positive values" do
assert_sprintf "% e", 123.45, " 1.234500e+2"
assert_sprintf "% e", -123.45, "-1.234500e+2"
assert_sprintf "% e", 0.0, " 0.000000e+0"
assert_sprintf "% e", 123.45, " 1.234500e+02"
assert_sprintf "% e", -123.45, "-1.234500e+02"
assert_sprintf "% e", 0.0, " 0.000000e+00"
end

it "writes space before left space-padding" do
assert_sprintf "% 20e", 123.45, " 1.234500e+2"
assert_sprintf "% 20e", -123.45, " -1.234500e+2"
assert_sprintf "% 20e", 0.0, " 0.000000e+0"
assert_sprintf "% 20e", 123.45, " 1.234500e+02"
assert_sprintf "% 20e", -123.45, " -1.234500e+02"
assert_sprintf "% 20e", 0.0, " 0.000000e+00"

assert_sprintf "% 020e", 123.45, " 000000001.234500e+2"
assert_sprintf "% 020e", -123.45, "-000000001.234500e+2"
assert_sprintf "% 020e", 0.0, " 000000000.000000e+0"
assert_sprintf "% 020e", 123.45, " 00000001.234500e+02"
assert_sprintf "% 020e", -123.45, "-00000001.234500e+02"
assert_sprintf "% 020e", 0.0, " 00000000.000000e+00"
end

it "is ignored if plus flag is also specified" do
assert_sprintf "% +e", 123.45, "+1.234500e+2"
assert_sprintf "%+ e", -123.45, "-1.234500e+2"
assert_sprintf "% +e", 123.45, "+1.234500e+02"
assert_sprintf "%+ e", -123.45, "-1.234500e+02"
end
end

context "zero flag" do
it "left-pads the result with zeros" do
assert_sprintf "%020e", 123.45, "0000000001.234500e+2"
assert_sprintf "%020e", -123.45, "-000000001.234500e+2"
assert_sprintf "%020e", 0.0, "0000000000.000000e+0"
assert_sprintf "%020e", 123.45, "000000001.234500e+02"
assert_sprintf "%020e", -123.45, "-00000001.234500e+02"
assert_sprintf "%020e", 0.0, "000000000.000000e+00"
end

it "is ignored if string is left-justified" do
assert_sprintf "%-020e", 123.45, "1.234500e+2 "
assert_sprintf "%-020e", -123.45, "-1.234500e+2 "
assert_sprintf "%-020e", 0.0, "0.000000e+0 "
assert_sprintf "%-020e", 123.45, "1.234500e+02 "
assert_sprintf "%-020e", -123.45, "-1.234500e+02 "
assert_sprintf "%-020e", 0.0, "0.000000e+00 "
end

it "can be used with precision" do
assert_sprintf "%020.12e", 123.45, "0001.234500000000e+2"
assert_sprintf "%020.12e", -123.45, "-001.234500000000e+2"
assert_sprintf "%020.12e", 0.0, "0000.000000000000e+0"
assert_sprintf "%020.12e", 123.45, "001.234500000000e+02"
assert_sprintf "%020.12e", -123.45, "-01.234500000000e+02"
assert_sprintf "%020.12e", 0.0, "000.000000000000e+00"
end
end

context "minus flag" do
it "left-justifies the string" do
assert_sprintf "%-20e", 123.45, "1.234500e+2 "
assert_sprintf "%-20e", -123.45, "-1.234500e+2 "
assert_sprintf "%-20e", 0.0, "0.000000e+0 "
assert_sprintf "%-20e", 123.45, "1.234500e+02 "
assert_sprintf "%-20e", -123.45, "-1.234500e+02 "
assert_sprintf "%-20e", 0.0, "0.000000e+00 "
end
end
end
Expand All @@ -588,8 +588,8 @@ describe "::sprintf" do
assert_sprintf "%g", 123.45, "123.45"
assert_sprintf "%G", 123.45, "123.45"

assert_sprintf "%g", 1.2345e-5, "1.2345e-5"
assert_sprintf "%G", 1.2345e-5, "1.2345E-5"
assert_sprintf "%g", 1.2345e-5, "1.2345e-05"
assert_sprintf "%G", 1.2345e-5, "1.2345E-05"

assert_sprintf "%g", 1.2345e+25, "1.2345e+25"
assert_sprintf "%G", 1.2345e+25, "1.2345E+25"
Expand Down Expand Up @@ -630,9 +630,9 @@ describe "::sprintf" do

context "precision specifier" do
it "sets the precision of the value" do
assert_sprintf "%.0g", 123.45, "1e+2"
assert_sprintf "%.1g", 123.45, "1e+2"
assert_sprintf "%.2g", 123.45, "1.2e+2"
assert_sprintf "%.0g", 123.45, "1e+02"
assert_sprintf "%.1g", 123.45, "1e+02"
assert_sprintf "%.2g", 123.45, "1.2e+02"
assert_sprintf "%.3g", 123.45, "123"
assert_sprintf "%.4g", 123.45, "123.5"
assert_sprintf "%.5g", 123.45, "123.45"
Expand All @@ -650,41 +650,41 @@ describe "::sprintf" do
assert_sprintf "%.5g", 1.23e-45, "1.23e-45"
assert_sprintf "%.6g", 1.23e-45, "1.23e-45"

assert_sprintf "%.1000g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125e-5"
assert_sprintf "%.1000g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125e-05"
end

it "can be used with width" do
assert_sprintf "%10.1g", 123.45, " 1e+2"
assert_sprintf "%10.2g", 123.45, " 1.2e+2"
assert_sprintf "%10.1g", 123.45, " 1e+02"
assert_sprintf "%10.2g", 123.45, " 1.2e+02"
assert_sprintf "%10.3g", 123.45, " 123"
assert_sprintf "%10.4g", 123.45, " 123.5"
assert_sprintf "%10.5g", 123.45, " 123.45"
assert_sprintf "%10.1g", -123.45, " -1e+2"
assert_sprintf "%10.2g", -123.45, " -1.2e+2"
assert_sprintf "%10.1g", -123.45, " -1e+02"
assert_sprintf "%10.2g", -123.45, " -1.2e+02"
assert_sprintf "%10.3g", -123.45, " -123"
assert_sprintf "%10.4g", -123.45, " -123.5"
assert_sprintf "%10.5g", -123.45, " -123.45"
assert_sprintf "%10.5g", 0, " 0"

assert_sprintf "%-10.1g", 123.45, "1e+2 "
assert_sprintf "%-10.2g", 123.45, "1.2e+2 "
assert_sprintf "%-10.1g", 123.45, "1e+02 "
assert_sprintf "%-10.2g", 123.45, "1.2e+02 "
assert_sprintf "%-10.3g", 123.45, "123 "
assert_sprintf "%-10.4g", 123.45, "123.5 "
assert_sprintf "%-10.5g", 123.45, "123.45 "
assert_sprintf "%-10.1g", -123.45, "-1e+2 "
assert_sprintf "%-10.2g", -123.45, "-1.2e+2 "
assert_sprintf "%-10.1g", -123.45, "-1e+02 "
assert_sprintf "%-10.2g", -123.45, "-1.2e+02 "
assert_sprintf "%-10.3g", -123.45, "-123 "
assert_sprintf "%-10.4g", -123.45, "-123.5 "
assert_sprintf "%-10.5g", -123.45, "-123.45 "
assert_sprintf "%-10.5g", 0, "0 "

assert_sprintf "%3.1g", 123.45, "1e+2"
assert_sprintf "%3.2g", 123.45, "1.2e+2"
assert_sprintf "%3.1g", 123.45, "1e+02"
assert_sprintf "%3.2g", 123.45, "1.2e+02"
assert_sprintf "%3.3g", 123.45, "123"
assert_sprintf "%3.4g", 123.45, "123.5"
assert_sprintf "%3.5g", 123.45, "123.45"
assert_sprintf "%3.1g", -123.45, "-1e+2"
assert_sprintf "%3.2g", -123.45, "-1.2e+2"
assert_sprintf "%3.1g", -123.45, "-1e+02"
assert_sprintf "%3.2g", -123.45, "-1.2e+02"
assert_sprintf "%3.3g", -123.45, "-123"
assert_sprintf "%3.4g", -123.45, "-123.5"
assert_sprintf "%3.5g", -123.45, "-123.45"
Expand All @@ -699,19 +699,19 @@ describe "::sprintf" do

context "sharp flag" do
it "prints decimal point and trailing zeros" do
assert_sprintf "%#.0g", 12345, "1.e+4"
assert_sprintf "%#.0g", 12345, "1.e+04"
assert_sprintf "%#.6g", 12345, "12345.0"
assert_sprintf "%#.10g", 12345, "12345.00000"
assert_sprintf "%#.100g", 12345, "12345.#{"0" * 95}"
assert_sprintf "%#.1000g", 12345, "12345.#{"0" * 995}"

assert_sprintf "%#.0g", 1e-5, "1.e-5"
assert_sprintf "%#.6g", 1e-5, "1.00000e-5"
assert_sprintf "%#.10g", 1e-5, "1.000000000e-5"
assert_sprintf "%#.100g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125#{"0" * 35}e-5"
assert_sprintf "%#.1000g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125#{"0" * 935}e-5"
assert_sprintf "%#.0g", 1e-5, "1.e-05"
assert_sprintf "%#.6g", 1e-5, "1.00000e-05"
assert_sprintf "%#.10g", 1e-5, "1.000000000e-05"
assert_sprintf "%#.100g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125#{"0" * 35}e-05"
assert_sprintf "%#.1000g", 1e-5, "1.0000000000000000818030539140313095458623138256371021270751953125#{"0" * 935}e-05"

assert_sprintf "%#15.0g", 12345, " 1.e+4"
assert_sprintf "%#15.0g", 12345, " 1.e+04"
assert_sprintf "%#15.6g", 12345, " 12345.0"
assert_sprintf "%#15.10g", 12345, " 12345.00000"
end
Expand Down Expand Up @@ -774,8 +774,8 @@ describe "::sprintf" do
end

it "can be used with precision" do
assert_sprintf "%010.2g", 123.45, "00001.2e+2"
assert_sprintf "%010.2g", -123.45, "-0001.2e+2"
assert_sprintf "%010.2g", 123.45, "0001.2e+02"
assert_sprintf "%010.2g", -123.45, "-001.2e+02"
assert_sprintf "%010.2g", 0.0, "0000000000"
end
end
Expand Down
12 changes: 10 additions & 2 deletions src/string/formatter.cr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -430,6 +430,7 @@ struct String::Formatter(A)
str_size = printf_size + trailing_zeros
str_size += 1 if sign < 0 || flags.plus || flags.space
str_size += 1 if flags.sharp && dot_index.nil?
str_size += 1 if printf_slice.size - e_index < 4

pad(str_size, flags) if flags.left_padding? && flags.padding_char != '0'

Expand All @@ -441,7 +442,9 @@ struct String::Formatter(A)
@io.write_string(printf_slice[0, e_index])
trailing_zeros.times { @io << '0' }
@io << '.' if flags.sharp && dot_index.nil?
@io.write_string(printf_slice[e_index..])
@io.write_string(printf_slice[e_index, 2])
@io << '0' if printf_slice.size - e_index < 4
@io.write_string(printf_slice[(e_index + 2)..])

pad(str_size, flags) if flags.right_padding?
end
Expand All @@ -465,6 +468,7 @@ struct String::Formatter(A)
str_size = printf_size
str_size += 1 if sign < 0 || flags.plus || flags.space
str_size += (dot_index.nil? ? 1 : 0) + trailing_zeros if flags.sharp
str_size += 1 if printf_slice.size - e_index < 4 if e_index

pad(str_size, flags) if flags.left_padding? && flags.padding_char != '0'

Expand All @@ -476,7 +480,11 @@ struct String::Formatter(A)
@io.write_string(printf_slice[0...e_index])
trailing_zeros.times { @io << '0' } if flags.sharp
@io << '.' if flags.sharp && dot_index.nil?
@io.write_string(printf_slice[e_index..]) if e_index
if e_index
@io.write_string(printf_slice[e_index, 2])
@io << '0' if printf_slice.size - e_index < 4
@io.write_string(printf_slice[(e_index + 2)..])
end

pad(str_size, flags) if flags.right_padding?
end
Expand Down

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