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https://github.com/golang/go
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Revert "go/printer: support for printing alias declarations"
This reverts commit 59c63c711c.
Reason: Decision to back out current alias implementation.
For #16339.
Change-Id: Idd135fe84b7ce4814cb3632f717736fc6985634c
Reviewed-on: https://go-review.googlesource.com/32822
Reviewed-by: Chris Manghane <cmang@golang.org>
This commit is contained in:
Robert Griesemer
parent
26e43779f1
commit
7179c1acd9
@ -1309,26 +1309,13 @@ func keepTypeColumn(specs []ast.Spec) []bool {
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}
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}
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i0 := -1 // if i0 >= 0 we are in a run and i0 is the start of the run
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var keepType bool // valid if we are in a run (i0 >= 0)
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i0 := -1 // if i0 >= 0 we are in a run and i0 is the start of the run
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var keepType bool
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for i, s := range specs {
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var hasValues, hasType bool
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switch t := s.(type) {
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case *ast.AliasSpec:
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// like a ValueSpec with values (alias origin), but no type
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hasValues = true
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case *ast.ValueSpec:
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hasValues = len(t.Values) > 0
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hasType = t.Type != nil
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default:
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panic("internal error: unexpected ast.Spec")
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}
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if hasValues {
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t := s.(*ast.ValueSpec)
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if t.Values != nil {
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if i0 < 0 {
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// start of a run with values
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// start of a run of ValueSpecs with non-nil Values
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i0 = i
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keepType = false
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}
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@ -1339,7 +1326,7 @@ func keepTypeColumn(specs []ast.Spec) []bool {
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i0 = -1
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}
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}
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if hasType {
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if t.Type != nil {
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keepType = true
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}
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}
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@ -1351,25 +1338,6 @@ func keepTypeColumn(specs []ast.Spec) []bool {
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return m
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}
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func (p *printer) aliasSpec(s *ast.AliasSpec, keepTypeCol bool) {
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p.setComment(s.Doc)
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p.expr(s.Name)
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extraTabs := 3
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if keepTypeCol {
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p.print(vtab)
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extraTabs--
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}
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p.print(vtab, token.ALIAS, blank)
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p.expr(s.Orig)
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extraTabs--
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if s.Comment != nil {
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for ; extraTabs > 0; extraTabs-- {
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p.print(vtab)
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}
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p.setComment(s.Comment)
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}
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}
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func (p *printer) valueSpec(s *ast.ValueSpec, keepType bool) {
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p.setComment(s.Doc)
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p.identList(s.Names, false) // always present
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@ -1453,17 +1421,6 @@ func (p *printer) spec(spec ast.Spec, n int, doIndent bool) {
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p.setComment(s.Comment)
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p.print(s.EndPos)
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case *ast.AliasSpec:
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p.setComment(s.Doc)
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p.expr(s.Name)
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if n == 1 {
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p.print(blank)
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} else {
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p.print(vtab)
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}
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p.print(token.ALIAS, blank)
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p.expr(s.Orig)
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case *ast.ValueSpec:
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if n != 1 {
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p.internalError("expected n = 1; got", n)
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@ -1515,16 +1472,7 @@ func (p *printer) genDecl(d *ast.GenDecl) {
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p.linebreak(p.lineFor(s.Pos()), 1, ignore, p.linesFrom(line) > 0)
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}
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p.recordLine(&line)
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switch t := s.(type) {
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case *ast.AliasSpec:
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p.aliasSpec(t, keepType[i])
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case *ast.ValueSpec:
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p.valueSpec(t, keepType[i])
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default:
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p.internalError("unknown ast.Spec type: %T", t)
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}
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p.valueSpec(s.(*ast.ValueSpec), keepType[i])
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}
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} else {
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var line int
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44
src/go/printer/testdata/declarations.golden
vendored
44
src/go/printer/testdata/declarations.golden
vendored
@ -985,47 +985,3 @@ func _(struct {
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x int
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y int
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}) // no extra comma between } and )
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// alias declarations
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const c => C
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const c => p.C
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const (
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a = 123
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b int = 456
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c => foo
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ddd => p.Foo
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)
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// TODO(gri) Currently = and => line up in the formatted output,
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// but because = and => have different lengths, the
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// text following doesn't line up. Consider putting that
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// text into its own column.
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const (
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a int = iota // a comment
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b => p.B // b comment
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c // c comment
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d => p.C // d comment
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e => p.E
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f
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g float32 = 9.8
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)
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type c => C
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type c => p.C
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type (
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s struct{}
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a => A
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ddd => p.Foo
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)
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var c => C
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var c => p.C
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var (
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a = 123
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b int = 456
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c => foo
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ddd => p.Foo
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)
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func f => F
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func f_long => p.F
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44
src/go/printer/testdata/declarations.input
vendored
44
src/go/printer/testdata/declarations.input
vendored
@ -999,47 +999,3 @@ func _(struct {
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x int
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y int
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}) // no extra comma between } and )
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// alias declarations
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const c => C
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const c => p.C
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const (
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a = 123
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b int = 456
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c => foo
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ddd => p.Foo
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)
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// TODO(gri) Currently = and => line up in the formatted output,
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// but because = and => have different lengths, the
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// text following doesn't line up. Consider putting that
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// text into its own column.
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const (
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a int = iota // a comment
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b => p.B // b comment
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c // c comment
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d => p.C // d comment
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e => p.E
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f
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g float32 = 9.8
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)
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type c => C
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type c => p.C
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type (
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s struct{}
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a => A
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ddd => p.Foo
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)
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var c => C
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var c => p.C
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var (
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a = 123
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b int = 456
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c => foo
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ddd => p.Foo
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)
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func f => F
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func f_long => p.F
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