cmd/gofmt: test that Go 2 number literals can be formatted

R=Go1.13

Updates #12711.
Updates #19308.
Updates #28493.
Updates #29008.

Change-Id: Icd25aa7f6e18ed671ea6cf2b1b292899daf4b1a5
Reviewed-on: https://go-review.googlesource.com/c/160018
Reviewed-by: Russ Cox <rsc@golang.org>

diff --git a/src/cmd/gofmt/testdata/go2numbers.golden b/src/cmd/gofmt/testdata/go2numbers.golden
new file mode 100644 (file)
index 0000000..a227a58
--- /dev/null
+++ b/src/cmd/gofmt/testdata/go2numbers.golden
@@ -0,0 +1,156 @@
+package p
+
+const (
+       _ = 0
+       _ = 0123
+       _ = 0123456
+
+       _ = 0_123
+       _ = 0123_456
+
+       // decimals
+       _ = 1
+       _ = 1234
+       _ = 1234567
+
+       _ = 1_234
+       _ = 1_234_567
+
+       // hexadecimals
+       _ = 0x0
+       _ = 0x1234
+       _ = 0xcafef00d
+
+       _ = 0X0
+       _ = 0X1234
+       _ = 0XCAFEf00d
+
+       _ = 0X_0
+       _ = 0X_1234
+       _ = 0X_CAFE_f00d
+
+       // octals
+       _ = 0o0
+       _ = 0o1234
+       _ = 0o01234567
+
+       _ = 0O0
+       _ = 0O1234
+       _ = 0O01234567
+
+       _ = 0o_0
+       _ = 0o_1234
+       _ = 0o0123_4567
+
+       _ = 0O_0
+       _ = 0O_1234
+       _ = 0O0123_4567
+
+       // binaries
+       _ = 0b0
+       _ = 0b1011
+       _ = 0b00101101
+
+       _ = 0B0
+       _ = 0B1011
+       _ = 0B00101101
+
+       _ = 0b_0
+       _ = 0b10_11
+       _ = 0b_0010_1101
+
+       // decimal floats
+       _ = 0.
+       _ = 123.
+       _ = 0123.
+
+       _ = .0
+       _ = .123
+       _ = .0123
+
+       _ = 0e0
+       _ = 123e+0
+       _ = 0123E-1
+
+       _ = 0e-0
+       _ = 123E+0
+       _ = 0123E123
+
+       _ = 0.e+1
+       _ = 123.E-10
+       _ = 0123.e123
+
+       _ = .0e-1
+       _ = .123E+10
+       _ = .0123E123
+
+       _ = 0.0
+       _ = 123.123
+       _ = 0123.0123
+
+       _ = 0.0e1
+       _ = 123.123E-10
+       _ = 0123.0123e+456
+
+       _ = 1_2_3.
+       _ = 0_123.
+
+       _ = 0_0e0
+       _ = 1_2_3e0
+       _ = 0_123e0
+
+       _ = 0e-0_0
+       _ = 1_2_3E+0
+       _ = 0123E1_2_3
+
+       _ = 0.e+1
+       _ = 123.E-1_0
+       _ = 01_23.e123
+
+       _ = .0e-1
+       _ = .123E+10
+       _ = .0123E123
+
+       _ = 1_2_3.123
+       _ = 0123.01_23
+
+       // hexadecimal floats
+       _ = 0x0.p+0
+       _ = 0Xdeadcafe.p-10
+       _ = 0x1234.P123
+
+       _ = 0x.1p-0
+       _ = 0X.deadcafep2
+       _ = 0x.1234P+10
+
+       _ = 0x0p0
+       _ = 0Xdeadcafep+1
+       _ = 0x1234P-10
+
+       _ = 0x0.0p0
+       _ = 0Xdead.cafep+1
+       _ = 0x12.34P-10
+
+       _ = 0Xdead_cafep+1
+       _ = 0x_1234P-10
+
+       _ = 0X_dead_cafe.p-10
+       _ = 0x12_34.P1_2_3
+
+       // imaginaries
+       _ = 0i
+       _ = 00i
+       _ = 1234i
+       _ = 1234567i
+
+       _ = 1_234i
+       _ = 1_234_567i
+
+       _ = 0.i
+       _ = 123.i
+       _ = 0123.i
+
+       _ = 0.e+1i
+       _ = 123.E-1_0i
+       _ = 01_23.e123i
+)

diff --git a/src/cmd/gofmt/testdata/go2numbers.input b/src/cmd/gofmt/testdata/go2numbers.input
new file mode 100644 (file)
index 0000000..a227a58
--- /dev/null
+++ b/src/cmd/gofmt/testdata/go2numbers.input
@@ -0,0 +1,156 @@
+package p
+
+const (
+       _ = 0
+       _ = 0123
+       _ = 0123456
+
+       _ = 0_123
+       _ = 0123_456
+
+       // decimals
+       _ = 1
+       _ = 1234
+       _ = 1234567
+
+       _ = 1_234
+       _ = 1_234_567
+
+       // hexadecimals
+       _ = 0x0
+       _ = 0x1234
+       _ = 0xcafef00d
+
+       _ = 0X0
+       _ = 0X1234
+       _ = 0XCAFEf00d
+
+       _ = 0X_0
+       _ = 0X_1234
+       _ = 0X_CAFE_f00d
+
+       // octals
+       _ = 0o0
+       _ = 0o1234
+       _ = 0o01234567
+
+       _ = 0O0
+       _ = 0O1234
+       _ = 0O01234567
+
+       _ = 0o_0
+       _ = 0o_1234
+       _ = 0o0123_4567
+
+       _ = 0O_0
+       _ = 0O_1234
+       _ = 0O0123_4567
+
+       // binaries
+       _ = 0b0
+       _ = 0b1011
+       _ = 0b00101101
+
+       _ = 0B0
+       _ = 0B1011
+       _ = 0B00101101
+
+       _ = 0b_0
+       _ = 0b10_11
+       _ = 0b_0010_1101
+
+       // decimal floats
+       _ = 0.
+       _ = 123.
+       _ = 0123.
+
+       _ = .0
+       _ = .123
+       _ = .0123
+
+       _ = 0e0
+       _ = 123e+0
+       _ = 0123E-1
+
+       _ = 0e-0
+       _ = 123E+0
+       _ = 0123E123
+
+       _ = 0.e+1
+       _ = 123.E-10
+       _ = 0123.e123
+
+       _ = .0e-1
+       _ = .123E+10
+       _ = .0123E123
+
+       _ = 0.0
+       _ = 123.123
+       _ = 0123.0123
+
+       _ = 0.0e1
+       _ = 123.123E-10
+       _ = 0123.0123e+456
+
+       _ = 1_2_3.
+       _ = 0_123.
+
+       _ = 0_0e0
+       _ = 1_2_3e0
+       _ = 0_123e0
+
+       _ = 0e-0_0
+       _ = 1_2_3E+0
+       _ = 0123E1_2_3
+
+       _ = 0.e+1
+       _ = 123.E-1_0
+       _ = 01_23.e123
+
+       _ = .0e-1
+       _ = .123E+10
+       _ = .0123E123
+
+       _ = 1_2_3.123
+       _ = 0123.01_23
+
+       // hexadecimal floats
+       _ = 0x0.p+0
+       _ = 0Xdeadcafe.p-10
+       _ = 0x1234.P123
+
+       _ = 0x.1p-0
+       _ = 0X.deadcafep2
+       _ = 0x.1234P+10
+
+       _ = 0x0p0
+       _ = 0Xdeadcafep+1
+       _ = 0x1234P-10
+
+       _ = 0x0.0p0
+       _ = 0Xdead.cafep+1
+       _ = 0x12.34P-10
+
+       _ = 0Xdead_cafep+1
+       _ = 0x_1234P-10
+
+       _ = 0X_dead_cafe.p-10
+       _ = 0x12_34.P1_2_3
+
+       // imaginaries
+       _ = 0i
+       _ = 00i
+       _ = 1234i
+       _ = 1234567i
+
+       _ = 1_234i
+       _ = 1_234_567i
+
+       _ = 0.i
+       _ = 123.i
+       _ = 0123.i
+
+       _ = 0.e+1i
+       _ = 123.E-1_0i
+       _ = 01_23.e123i
+)