Golang code-google-com-p-go-tools-go-types.NewFunc类(方法)实例源码

// Func = Name FunctionType .
func (p *parser) parseFunc(pkg *types.Package) *types.Func {
	name := p.parseName()
	if strings.ContainsRune(name, '$') {
		// This is a Type$equal or Type$hash function, which we don't want to parse,
		// except for the types.
		p.discardDirectiveWhileParsingTypes(pkg)
		return nil
	}
	return types.NewFunc(token.NoPos, pkg, name, p.parseFunctionType(pkg))
}

// InterfaceType = "interface" "{" [ MethodList ] "}" .
// MethodList    = Method { ";" Method } .
// Method        = Name Signature .
//
// The methods of embedded interfaces are always "inlined"
// by the compiler and thus embedded interfaces are never
// visible in the export data.
//
func (p *parser) parseInterfaceType() types.Type {
	var methods []*types.Func

	p.expectKeyword("interface")
	p.expect('{')
	for i := 0; p.tok != '}' && p.tok != scanner.EOF; i++ {
		if i > 0 {
			p.expect(';')
		}
		pkg, name := p.parseName(true)
		sig := p.parseSignature(nil)
		methods = append(methods, types.NewFunc(token.NoPos, pkg, name, sig))
	}
	p.expect('}')

	return types.NewInterface(methods, nil)
}

// MethodDecl = "func" Receiver Name Func .
// Receiver   = "(" ( identifier | "?" ) [ "*" ] ExportedName ")" .
//
func (p *parser) parseMethodDecl() {
	// "func" already consumed
	p.expect('(')
	recv, _ := p.parseParameter() // receiver
	p.expect(')')

	// determine receiver base type object
	base := deref(recv.Type()).(*types.Named)

	// parse method name, signature, and possibly inlined body
	pkg, name := p.parseName(true)
	sig := p.parseFunc(recv)

	// add method to type unless type was imported before
	// and method exists already
	// TODO(gri) This leads to a quadratic algorithm - ok for now because method counts are small.
	base.AddMethod(types.NewFunc(token.NoPos, pkg, name, sig))
}

// InterfaceType = "interface" "{" [ MethodList ] "}" .
// MethodList    = Method { ";" Method } .
// Method        = Name Signature .
//
// The methods of embedded interfaces are always "inlined"
// by the compiler and thus embedded interfaces are never
// visible in the export data.
//
func (p *parser) parseInterfaceType() types.Type {
	var methods []*types.Func

	p.expectKeyword("interface")
	p.expect('{')
	for i := 0; p.tok != '}' && p.tok != scanner.EOF; i++ {
		if i > 0 {
			p.expect(';')
		}
		pkg, name := p.parseName(true)
		sig := p.parseSignature(nil)
		methods = append(methods, types.NewFunc(token.NoPos, pkg, name, sig))
	}
	p.expect('}')

	// Complete requires the type's embedded interfaces to be fully defined,
	// but we do not define any
	return types.NewInterface(methods, nil).Complete()
}

func (p *importer) obj(pkg *types.Package) {
	var obj types.Object
	switch tag := p.int(); tag {
	case constTag:
		obj = types.NewConst(token.NoPos, pkg, p.string(), p.typ(), p.value())
	case typeTag:
		// type object is added to scope via respective named type
		_ = p.typ().(*types.Named)
		return
	case varTag:
		obj = types.NewVar(token.NoPos, pkg, p.string(), p.typ())
	case funcTag:
		obj = types.NewFunc(token.NoPos, pkg, p.string(), p.typ().(*types.Signature))
	default:
		panic(fmt.Sprintf("unexpected object tag %d", tag))
	}

	if alt := pkg.Scope().Insert(obj); alt != nil {
		panic(fmt.Sprintf("%s already declared", alt.Name()))
	}
}

// NamedType = TypeName Type { Method } .
// Method    = "func" "(" Param ")" Name ParamList ResultList ";" .
func (p *parser) parseNamedType(n int) types.Type {
	obj := p.parseTypeName()

	pkg := obj.Pkg()
	typ := obj.Type()
	p.typeMap[n] = typ

	nt, ok := typ.(*types.Named)
	if !ok {
		// This can happen for unsafe.Pointer, which is a TypeName holding a Basic type.
		pt := p.parseType(pkg)
		if pt != typ {
			p.error("unexpected underlying type for non-named TypeName")
		}
		return typ
	}

	underlying := p.parseType(pkg)
	if nt.Underlying() == nil {
		nt.SetUnderlying(underlying.Underlying())
	}

	for p.tok == scanner.Ident {
		// collect associated methods
		p.expectKeyword("func")
		p.expect('(')
		receiver, _ := p.parseParam(pkg)
		p.expect(')')
		name := p.parseName()
		params, isVariadic := p.parseParamList(pkg)
		results := p.parseResultList(pkg)
		p.expect(';')

		sig := types.NewSignature(pkg.Scope(), receiver, params, results, isVariadic)
		nt.AddMethod(types.NewFunc(token.NoPos, pkg, name, sig))
	}

	return nt
}

func (p *importer) typ() types.Type {
	// if the type was seen before, i is its index (>= 0)
	i := p.int()
	if i >= 0 {
		return p.typList[i]
	}

	// otherwise, i is the type tag (< 0)
	switch i {
	case arrayTag:
		t := new(types.Array)
		p.record(t)

		n := p.int64()
		*t = *types.NewArray(p.typ(), n)
		return t

	case sliceTag:
		t := new(types.Slice)
		p.record(t)

		*t = *types.NewSlice(p.typ())
		return t

	case structTag:
		t := new(types.Struct)
		p.record(t)

		n := p.int()
		fields := make([]*types.Var, n)
		tags := make([]string, n)
		for i := range fields {
			fields[i] = p.field()
			tags[i] = p.string()
		}
		*t = *types.NewStruct(fields, tags)
		return t

	case pointerTag:
		t := new(types.Pointer)
		p.record(t)

		*t = *types.NewPointer(p.typ())
		return t

	case signatureTag:
		t := new(types.Signature)
		p.record(t)

		*t = *p.signature()
		return t

	case interfaceTag:
		t := new(types.Interface)
		p.record(t)

		// read embedded interfaces
		embeddeds := make([]*types.Named, p.int())
		for i := range embeddeds {
			embeddeds[i] = p.typ().(*types.Named)
		}

		// read methods
		methods := make([]*types.Func, p.int())
		for i := range methods {
			pkg, name := p.qualifiedName()
			methods[i] = types.NewFunc(token.NoPos, pkg, name, p.typ().(*types.Signature))
		}

		*t = *types.NewInterface(methods, embeddeds)
		return t

	case mapTag:
		t := new(types.Map)
		p.record(t)

		*t = *types.NewMap(p.typ(), p.typ())
		return t

	case chanTag:
		t := new(types.Chan)
		p.record(t)

		*t = *types.NewChan(types.ChanDir(p.int()), p.typ())
		return t

	case namedTag:
		// read type object
		name := p.string()
		pkg := p.pkg()
		scope := pkg.Scope()
		obj := scope.Lookup(name)

		// if the object doesn't exist yet, create and insert it
		if obj == nil {
			obj = types.NewTypeName(token.NoPos, pkg, name, nil)
			scope.Insert(obj)
		}

		// associate new named type with obj if it doesn't exist yet
//.........这里部分代码省略.........

// FuncDecl = "func" ExportedName Func .
//
func (p *parser) parseFuncDecl() {
	// "func" already consumed
	pkg, name := p.parseExportedName()
	typ := p.parseFunc(nil)
	pkg.Scope().Insert(types.NewFunc(token.NoPos, pkg, name, typ))
}

//.........这里部分代码省略.........
		if p := sig.Params(); p != nil {
			for i := 1; i <= p.Len(); i++ {
				w.WriteString(", _" + strconv.Itoa(i))
			}
		}
		w.WriteString("); } func;})")

	case *ast.SliceExpr:
		cdd.SliceExpr(w, e)

	case *ast.StarExpr:
		w.WriteByte('*')
		cdd.Expr(w, e.X, nil)

	case *ast.TypeAssertExpr:
		notImplemented(e)

	case *ast.CompositeLit:
		typ := cdd.exprType(e)

		switch t := underlying(typ).(type) {
		case *types.Array:
			w.WriteByte('{')
			nilT = t.Elem()

		case *types.Slice:
			w.WriteString("(slice){(")
			dim, _ := cdd.Type(w, t.Elem())
			dim = append([]string{"[]"}, dim...)
			w.WriteString(dimFuncPtr("", dim))
			w.WriteString("){")
			nilT = t.Elem()

		case *types.Struct:
			w.WriteByte('(')
			cdd.Type(w, typ)
			w.WriteString("){")
			nilT = nil

		default:
			notImplemented(e, t)
		}

		for i, el := range e.Elts {
			if i > 0 {
				w.WriteString(", ")
			}
			if nilT != nil {
				cdd.Expr(w, el, nilT)
			} else {
				cdd.Expr(w, el, underlying(typ).(*types.Struct).Field(i).Type())
			}
		}

		switch underlying(typ).(type) {
		case *types.Slice:
			w.WriteByte('}')
			plen := ", " + strconv.Itoa(len(e.Elts))
			w.WriteString(plen)
			w.WriteString(plen)
			w.WriteByte('}')

		default:
			w.WriteByte('}')
		}

	case *ast.FuncLit:
		fname := "func"

		fd := &ast.FuncDecl{
			Name: &ast.Ident{NamePos: e.Type.Func, Name: fname},
			Type: e.Type,
			Body: e.Body,
		}
		sig := cdd.exprType(e).(*types.Signature)
		cdd.gtc.ti.Defs[fd.Name] = types.NewFunc(e.Type.Func, cdd.gtc.pkg, fname, sig)

		w.WriteString("({\n")
		cdd.il++

		cdds := cdd.gtc.FuncDecl(fd, cdd.il)
		for _, c := range cdds {
			for u, typPtr := range c.FuncBodyUses {
				cdd.FuncBodyUses[u] = typPtr
			}
			cdd.indent(w)
			w.Write(c.Def)
		}

		cdd.indent(w)
		w.WriteString(fname + "$;\n")

		cdd.il--
		cdd.indent(w)
		w.WriteString("})")

	default:
		fmt.Fprintf(w, "!%v<%T>!", e, e)
	}
}