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cmd/compile: simplify parsing of type aliases

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Change-Id: Ia86841cf84bc17ff6ecc6e5ac4cec86384a0da00
Reviewed-on: https://go-review.googlesource.com/31719
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2016-10-21 17:23:01 -07:00
parent 1b0cf430dd
commit c0e2318f7c
4 changed files with 8 additions and 19 deletions
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5
src/cmd/compile/internal/gc/noder.go
View File

@ -90,11 +90,6 @@ func (p *noder) decls(decls []syntax.Decl) (l []*Node) {
lastConstGroup = decl.Group
case *syntax.TypeDecl:
// TODO(gri) remove this notation - we're not going to use it after all
if decl.Alias {
yyerror("type aliases using = not supported")
break
}
l = append(l, p.typeDecl(decl))
case *syntax.FuncDecl:

1
src/cmd/compile/internal/syntax/nodes.go
View File

@ -89,7 +89,6 @@ type (
TypeDecl struct {
Name *Name
Type Expr
Alias bool
Group *Group // nil means not part of a group
Pragma Pragma
decl

15
src/cmd/compile/internal/syntax/parser.go
View File

@ -322,7 +322,8 @@ func (p *parser) aliasDecl(tok token, name *Name, group *Group) Decl {
d := new(AliasDecl)
d.initFrom(&name.node)
p.want(_Rarrow)
// lhs identifier and "=>" have been consumed already
d.Tok = tok
d.Name = name
d.Orig = p.dotname(p.name())
@ -338,7 +339,7 @@ func (p *parser) constDecl(group *Group) Decl {
}
name := p.name()
if p.tok == _Rarrow {
if p.got(_Rarrow) {
return p.aliasDecl(Const, name, group)
}
@ -364,7 +365,8 @@ func (p *parser) typeDecl(group *Group) Decl {
}
name := p.name()
if p.tok == _Rarrow {
// permit both: type T => p.T and: type T = p.T for now
if p.got(_Rarrow) || p.got(_Assign) {
return p.aliasDecl(Type, name, group)
}
@ -372,9 +374,6 @@ func (p *parser) typeDecl(group *Group) Decl {
d.initFrom(&name.node)
d.Name = name
// accept "type T = p.T" for now so we can experiment
// with a type-alias only approach as well
d.Alias = p.got(_Assign)
d.Type = p.tryType()
if d.Type == nil {
p.syntax_error("in type declaration")
@ -393,7 +392,7 @@ func (p *parser) varDecl(group *Group) Decl {
}
name := p.name()
if p.tok == _Rarrow {
if p.got(_Rarrow) {
return p.aliasDecl(Var, name, group)
}
@ -449,7 +448,7 @@ func (p *parser) funcDecl() Decl {
}
name := p.name()
if recv == nil && p.tok == _Rarrow {
if recv == nil && p.got(_Rarrow) {
return p.aliasDecl(Func, name, nil)
}

6
src/cmd/compile/internal/syntax/printer.go
View File

@ -625,11 +625,7 @@ func (p *printer) printRawNode(n Node) {
if n.Group == nil {
p.print(_Type, blank)
}
p.print(n.Name, blank)
if n.Alias {
p.print(_Assign, blank)
}
p.print(n.Type)
p.print(n.Name, blank, n.Type)
case *VarDecl:
if n.Group == nil {