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[dev.typeparams] go/token, go/scanner: add the "~" operator

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This is an approximate port of CL 307370 to go/token and go/scanner.

Change-Id: I5b789408f825f7e39f569322cb67802117b9d734
Reviewed-on: https://go-review.googlesource.com/c/go/+/324992
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley 2021-06-03 22:07:36 -04:00 committed by Robert Findley
parent ad59efb027
commit 7c5d7a4caf
3 changed files with 14 additions and 2 deletions
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2
src/go/scanner/scanner.go
View File

@ -969,6 +969,8 @@ scanAgain:
}
case '|':
tok = s.switch3(token.OR, token.OR_ASSIGN, '|', token.LOR)
case '~':
tok = token.TILDE
default:
// next reports unexpected BOMs - don't repeat
if ch != bom {

3
src/go/scanner/scanner_test.go
View File

@ -40,7 +40,7 @@ type elt struct {
class int
}
var tokens = [...]elt{
var tokens = []elt{
// Special tokens
{token.COMMENT, "/* a comment */", special},
{token.COMMENT, "// a comment \n", special},
@ -149,6 +149,7 @@ var tokens = [...]elt{
{token.RBRACE, "}", operator},
{token.SEMICOLON, ";", operator},
{token.COLON, ":", operator},
{token.TILDE, "~", operator},
// Keywords
{token.BREAK, "break", keyword},

11
src/go/token/token.go
View File

@ -125,6 +125,11 @@ const (
TYPE
VAR
keyword_end
additional_beg
// additional tokens, handled in an ad-hoc manner
TILDE
additional_end
)
var tokens = [...]string{
@ -225,6 +230,8 @@ var tokens = [...]string{
SWITCH: "switch",
TYPE: "type",
VAR: "var",
TILDE: "~",
}
// String returns the string corresponding to the token tok.
@ -304,7 +311,9 @@ func (tok Token) IsLiteral() bool { return literal_beg < tok && tok < literal_en
// IsOperator returns true for tokens corresponding to operators and
// delimiters; it returns false otherwise.
//
func (tok Token) IsOperator() bool { return operator_beg < tok && tok < operator_end }
func (tok Token) IsOperator() bool {
return (operator_beg < tok && tok < operator_end) || tok == TILDE
}
// IsKeyword returns true for tokens corresponding to keywords;
// it returns false otherwise.