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cmd/compile: accept 'i' suffix orthogonally on all numbers

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This change accepts the 'i' suffix on binary and octal integer
literals as well as hexadecimal floats. The suffix was already
accepted on decimal integers and floats.

Note that 0123i == 123i for backward-compatibility (and 09i is
valid).

See also the respective language in the spec change:
https://golang.org/cl/161098

Change-Id: I9d2d755cba36a3fa7b9e24308c73754d4568daaf
Reviewed-on: https://go-review.googlesource.com/c/162878
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2019-02-14 17:34:29 -08:00
parent c3b49186a6
commit 4ad5537bfa
5 changed files with 58 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

3
src/cmd/compile/internal/syntax/scanner.go
View file

@ -512,9 +512,6 @@ func (s *scanner) number(c rune) {
// suffix 'i'
if c == 'i' {
s.kind = ImagLit
if prefix != 0 && prefix != '0' {
s.error("invalid suffix 'i' on " + litname(prefix))
}
c = s.getr()
}
s.ungetr()

20
src/cmd/compile/internal/syntax/scanner_test.go
View file

@ -347,13 +347,14 @@ func TestNumbers(t *testing.T) {
{IntLit, "0b0190", "0b0190", "invalid digit '9' in binary literal"},
{IntLit, "0b01a0", "0b01 a0", ""}, // only accept 0-9
// binary floats and imaginaries (invalid)
{FloatLit, "0b.", "0b.", "invalid radix point in binary literal"},
{FloatLit, "0b.1", "0b.1", "invalid radix point in binary literal"},
{FloatLit, "0b1.0", "0b1.0", "invalid radix point in binary literal"},
{FloatLit, "0b1e10", "0b1e10", "'e' exponent requires decimal mantissa"},
{FloatLit, "0b1P-1", "0b1P-1", "'P' exponent requires hexadecimal mantissa"},
{ImagLit, "0b10i", "0b10i", "invalid suffix 'i' on binary literal"},
{ImagLit, "0b10i", "0b10i", ""},
{ImagLit, "0b10.0i", "0b10.0i", "invalid radix point in binary literal"},
// octals
{IntLit, "0o0", "0o0", ""},
@ -365,13 +366,14 @@ func TestNumbers(t *testing.T) {
{IntLit, "0o1293", "0o1293", "invalid digit '9' in octal literal"},
{IntLit, "0o12a3", "0o12 a3", ""}, // only accept 0-9
// octal floats and imaginaries (invalid)
{FloatLit, "0o.", "0o.", "invalid radix point in octal literal"},
{FloatLit, "0o.2", "0o.2", "invalid radix point in octal literal"},
{FloatLit, "0o1.2", "0o1.2", "invalid radix point in octal literal"},
{FloatLit, "0o1E+2", "0o1E+2", "'E' exponent requires decimal mantissa"},
{FloatLit, "0o1p10", "0o1p10", "'p' exponent requires hexadecimal mantissa"},
{ImagLit, "0o10i", "0o10i", "invalid suffix 'i' on octal literal"},
{ImagLit, "0o10i", "0o10i", ""},
{ImagLit, "0o10e0i", "0o10e0i", "'e' exponent requires decimal mantissa"},
// 0-octals
{IntLit, "0", "0", ""},
@ -389,6 +391,9 @@ func TestNumbers(t *testing.T) {
{IntLit, "1f", "1 f", ""}, // only accept 0-9
{ImagLit, "0i", "0i", ""},
{ImagLit, "0678i", "0678i", ""},
// decimal floats
{FloatLit, "0.", "0.", ""},
{FloatLit, "123.", "123.", ""},
@ -424,7 +429,6 @@ func TestNumbers(t *testing.T) {
{FloatLit, "0p0", "0p0", "'p' exponent requires hexadecimal mantissa"},
{FloatLit, "1.0P-1", "1.0P-1", "'P' exponent requires hexadecimal mantissa"},
// decimal imaginaries
{ImagLit, "0.i", "0.i", ""},
{ImagLit, ".123i", ".123i", ""},
{ImagLit, "123.123i", "123.123i", ""},
@ -441,6 +445,8 @@ func TestNumbers(t *testing.T) {
{IntLit, "0x", "0x", "hexadecimal literal has no digits"},
{IntLit, "0x1g", "0x1 g", ""},
{ImagLit, "0xf00i", "0xf00i", ""},
// hexadecimal floats
{FloatLit, "0x0p0", "0x0p0", ""},
{FloatLit, "0x12efp-123", "0x12efp-123", ""},
@ -459,9 +465,7 @@ func TestNumbers(t *testing.T) {
{FloatLit, "0x1234PAB", "0x1234P AB", "exponent has no digits"},
{FloatLit, "0x1.2p1a", "0x1.2p1 a", ""},
// hexadecimal imaginaries (invalid)
{ImagLit, "0xf00i", "0xf00i", "invalid suffix 'i' on hexadecimal literal"},
{ImagLit, "0xf00.bap+12i", "0xf00.bap+12i", "invalid suffix 'i' on hexadecimal literal"},
{ImagLit, "0xf00.bap+12i", "0xf00.bap+12i", ""},
// separators
{IntLit, "0b_1000_0001", "0b_1000_0001", ""},

3
src/cmd/compile/internal/syntax/tokens.go
View file

@ -92,6 +92,9 @@ func contains(tokset uint64, tok token) bool {
type LitKind uint
// TODO(gri) With the 'i' (imaginary) suffix now permitted on integer
// and floating-point numbers, having a single ImagLit does
// not represent the literal kind well anymore. Remove it?
const (
IntLit LitKind = iota
FloatLit