Beispiel #1
0
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)
}
Beispiel #2
0
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)
}
Beispiel #3
0
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
}