func (p *printer) file(src *ast.File) {
p.setComment(src.Doc)
p.print(src.Pos(), token.PACKAGE, blank)
p.expr(src.Name)
p.declList(src.Decls)
p.print(newline)
}
func convertAST(info *types.Info, src []byte, sgoAST *ast.File, fset *token.FileSet) []byte {
c := converter{
Info: info,
src: src,
base: fset.File(sgoAST.Pos()).Base() - 1,
fset: fset,
}
c.convertFile(sgoAST)
return bytes.Join(append(c.dstChunks, src[c.lastChunkEnd:]), nil)
}
func fileWithAnnotationComments(file *ast.File, fset, oldFset *token.FileSet, src []byte) ([]byte, *ast.File, error) {
// TODO: So this is an extremely hacky way of doing this. We're going to
// add the comments directly to the source comments, as text, and then
// we're going to re-parse it. This is because I tried manipulating the
// AST, adding the commments there an shifting the nodes' positions, but
// doing that right is very very convoluted; you need to be tracking all
// the time where you are, where you _were_, figure out where's a line
// break, etc. So, well, this will do for now.
var err error
var dstChunks [][]byte
var lastChunkEnd int
skipNextSpec := false
addDoc := func(node ast.Node, name *ast.Ident, typ ast.Expr) {
if typ == nil {
return
}
if name != nil && len(name.Name) > 0 {
c := name.Name[0]
if !(c >= 'A' && c <= 'Z') {
return
}
}
buf := &bytes.Buffer{}
err = printer.Fprint(buf, token.NewFileSet(), typ)
if err != nil {
return
}
pos := int(node.Pos()) - oldFset.File(file.Pos()).Base()
var space []byte
for i := pos - 1; i >= 0 && (src[i] == ' ' || src[i] == '\t'); i-- {
space = append([]byte{src[i]}, space...)
}
text := append([]byte("// For SGo: "+buf.String()+"\n"), space...)
dstChunks = append(dstChunks, src[lastChunkEnd:pos], text)
lastChunkEnd = pos
}
var visitor visitorFunc
visitor = visitorFunc(func(node ast.Node) (w ast.Visitor) {
var typ ast.Expr
var name *ast.Ident
switch node := node.(type) {
case *ast.FuncDecl:
typ = node.Type
name = node.Name
case *ast.GenDecl:
if node.Lparen != 0 || node.Tok == token.IMPORT || node.Tok == token.CONST {
return visitor
}
switch spec := node.Specs[0].(type) {
case *ast.TypeSpec:
skipNextSpec = true
typ = spec.Type
name = spec.Name
case *ast.ValueSpec:
skipNextSpec = true
typ = spec.Type
if len(spec.Names.List) > 0 {
name = spec.Names.List[0]
}
}
switch typ.(type) {
case *ast.InterfaceType, *ast.StructType:
return visitor
}
case *ast.InterfaceType:
for i := 0; i < len(node.Methods.List); i++ {
item := node.Methods.List[i]
if len(item.Names) > 0 {
name = item.Names[0]
}
addDoc(item, name, item.Type)
}
return visitor
case *ast.StructType:
for i := 0; i < len(node.Fields.List); i++ {
item := node.Fields.List[i]
if len(item.Names) > 0 {
name = item.Names[0]
}
addDoc(item, name, item.Type)
}
return visitor
case *ast.TypeSpec:
if skipNextSpec {
skipNextSpec = false
return visitor
}
typ = node.Type
name = node.Name
case *ast.ValueSpec:
if skipNextSpec {
skipNextSpec = false
return visitor
}
typ = node.Type
if len(node.Names.List) > 0 {
name = node.Names.List[0]
}
default:
return visitor
}
addDoc(node, name, typ)
return visitor
})
ast.Walk(visitor, file)
if err != nil {
return nil, nil, err
}
dst := append(
[]byte("// Autogenerated by SGo revision: "+SGoRevision+"\n// DO NOT EDIT!\n\n"),
bytes.Join(append(dstChunks, src[lastChunkEnd:]), nil)...)
dstFile, err := parser.ParseFile(fset, file.Name.Name, dst, parser.ParseComments)
return dst, dstFile, err
}