Golang typesutil.IsJsObject函数代码示例

func (c *funcContext) translateImplicitConversion(expr ast.Expr, desiredType types.Type) *expression {
	if desiredType == nil {
		return c.translateExpr(expr)
	}

	exprType := c.p.TypeOf(expr)
	if types.Identical(exprType, desiredType) {
		return c.translateExpr(expr)
	}

	basicExprType, isBasicExpr := exprType.Underlying().(*types.Basic)
	if isBasicExpr && basicExprType.Kind() == types.UntypedNil {
		return c.formatExpr("%e", c.zeroValue(desiredType))
	}

	switch desiredType.Underlying().(type) {
	case *types.Slice:
		return c.formatExpr("$subslice(new %1s(%2e.$array), %2e.$offset, %2e.$offset + %2e.$length)", c.typeName(desiredType), expr)

	case *types.Interface:
		if typesutil.IsJsObject(exprType) {
			// wrap JS object into js.Object struct when converting to interface
			return c.formatExpr("new $jsObjectPtr(%e)", expr)
		}
		if isWrapped(exprType) {
			return c.formatExpr("new %s(%e)", c.typeName(exprType), expr)
		}
		if _, isStruct := exprType.Underlying().(*types.Struct); isStruct {
			return c.formatExpr("new %1e.constructor.elem(%1e)", expr)
		}
	}

	return c.translateExpr(expr)
}

func (c *funcContext) translateSelection(sel *types.Selection, pos token.Pos) ([]string, string) {
	var fields []string
	t := sel.Recv()
	for _, index := range sel.Index() {
		if ptr, isPtr := t.(*types.Pointer); isPtr {
			t = ptr.Elem()
		}
		s := t.Underlying().(*types.Struct)
		if jsTag := getJsTag(s.Tag(index)); jsTag != "" {
			jsFieldName := s.Field(index).Name()
			for {
				fields = append(fields, fieldName(s, 0))
				ft := s.Field(0).Type()
				if typesutil.IsJsObject(ft) {
					return fields, jsTag
				}
				ft = ft.Underlying()
				if ptr, ok := ft.(*types.Pointer); ok {
					ft = ptr.Elem().Underlying()
				}
				var ok bool
				s, ok = ft.(*types.Struct)
				if !ok || s.NumFields() == 0 {
					c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: pos, Msg: fmt.Sprintf("could not find field with type *js.Object for 'js' tag of field '%s'", jsFieldName), Soft: true})
					return nil, ""
				}
			}
		}
		fields = append(fields, fieldName(s, index))
		t = s.Field(index).Type()
	}
	return fields, ""
}

func (c *funcContext) zeroValue(ty types.Type) string {
	if typesutil.IsJsObject(ty) {
		return "null"
	}
	switch t := ty.Underlying().(type) {
	case *types.Basic:
		switch {
		case is64Bit(t) || isComplex(t):
			return fmt.Sprintf("new %s(0, 0)", c.typeName(ty))
		case isBoolean(t):
			return "false"
		case isNumeric(t), t.Kind() == types.UnsafePointer:
			return "0"
		case isString(t):
			return `""`
		case t.Kind() == types.UntypedNil:
			panic("Zero value for untyped nil.")
		default:
			panic("Unhandled type")
		}
	case *types.Array:
		return fmt.Sprintf("%s.zero()", c.typeName(ty))
	case *types.Signature:
		return "$throwNilPointerError"
	case *types.Slice:
		return fmt.Sprintf("%s.nil", c.typeName(ty))
	case *types.Struct:
		return fmt.Sprintf("new %s.ptr()", c.typeName(ty))
	case *types.Map:
		return "false"
	case *types.Interface:
		return "$ifaceNil"
	}
	return fmt.Sprintf("%s.nil", c.typeName(ty))
}

func (c *funcContext) externalize(s string, t types.Type) string {
	if typesutil.IsJsObject(t) {
		return s
	}
	switch u := t.Underlying().(type) {
	case *types.Basic:
		if isNumeric(u) && !is64Bit(u) && !isComplex(u) {
			return s
		}
		if u.Kind() == types.UntypedNil {
			return "null"
		}
	}
	return fmt.Sprintf("$externalize(%s, %s)", s, c.typeName(t))
}

func (c *funcContext) translateAssignOfExpr(lhs, rhs ast.Expr, typ types.Type, define bool) string {
	if l, ok := lhs.(*ast.IndexExpr); ok {
		if t, ok := c.p.Types[l.X].Type.Underlying().(*types.Map); ok {
			if typesutil.IsJsObject(c.p.Types[l.Index].Type) {
				c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: l.Index.Pos(), Msg: "cannot use js.Object as map key"})
			}
			keyVar := c.newVariable("_key")
			return fmt.Sprintf(`%s = %s; (%s || $throwRuntimeError("assignment to entry in nil map"))[%s.keyFor(%s)] = { k: %s, v: %s };`, keyVar, c.translateImplicitConversionWithCloning(l.Index, t.Key()), c.translateExpr(l.X), c.typeName(t.Key()), keyVar, keyVar, c.translateImplicitConversionWithCloning(rhs, t.Elem()))
		}
	}

	if _, ok := rhs.(*ast.CompositeLit); ok && define {
		return fmt.Sprintf("%s = %s;", c.translateExpr(lhs), c.translateImplicitConversion(rhs, typ)) // skip $copy
	}
	return c.translateAssign(lhs, c.translateImplicitConversion(rhs, typ).String(), typ, define)
}

func (c *funcContext) internalize(s *expression, t types.Type) *expression {
	if typesutil.IsJsObject(t) {
		return s
	}
	switch u := t.Underlying().(type) {
	case *types.Basic:
		switch {
		case isBoolean(u):
			return c.formatExpr("!!(%s)", s)
		case isInteger(u) && !is64Bit(u):
			return c.fixNumber(c.formatExpr("$parseInt(%s)", s), u)
		case isFloat(u):
			return c.formatExpr("$parseFloat(%s)", s)
		}
	}
	return c.formatExpr("$internalize(%s, %s)", s, c.typeName(t))
}

//.........这里部分代码省略.........
				}
				for _, element := range e.Elts {
					kve := element.(*ast.KeyValueExpr)
					for j := range elements {
						if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
							elements[j] = c.translateImplicitConversionWithCloning(kve.Value, t.Field(j).Type()).String()
							break
						}
					}
				}
			}
			return c.formatExpr("new %s.ptr(%s)", c.typeName(exprType), strings.Join(elements, ", "))
		default:
			panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
		}

	case *ast.FuncLit:
		_, fun := translateFunction(e.Type, nil, e.Body, c, exprType.(*types.Signature), c.p.FuncLitInfos[e], "")
		if len(c.p.escapingVars) != 0 {
			names := make([]string, 0, len(c.p.escapingVars))
			for obj := range c.p.escapingVars {
				names = append(names, c.p.objectNames[obj])
			}
			sort.Strings(names)
			list := strings.Join(names, ", ")
			return c.formatExpr("(function(%s) { return %s; })(%s)", list, fun, list)
		}
		return c.formatExpr("(%s)", fun)

	case *ast.UnaryExpr:
		t := c.p.TypeOf(e.X)
		switch e.Op {
		case token.AND:
			if typesutil.IsJsObject(exprType) {
				return c.formatExpr("%e.object", e.X)
			}

			switch t.Underlying().(type) {
			case *types.Struct, *types.Array:
				return c.translateExpr(e.X)
			}

			switch x := astutil.RemoveParens(e.X).(type) {
			case *ast.CompositeLit:
				return c.formatExpr("$newDataPointer(%e, %s)", x, c.typeName(c.p.TypeOf(e)))
			case *ast.Ident:
				obj := c.p.Uses[x].(*types.Var)
				if c.p.escapingVars[obj] {
					return c.formatExpr("(%1s.$ptr || (%1s.$ptr = new %2s(function() { return this.$target[0]; }, function($v) { this.$target[0] = $v; }, %1s)))", c.p.objectNames[obj], c.typeName(exprType))
				}
				return c.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, c.varPtrName(obj), c.typeName(exprType), c.objectName(obj), c.translateAssign(x, c.newIdent("$v", exprType), false))
			case *ast.SelectorExpr:
				sel, ok := c.p.Selections[x]
				if !ok {
					// qualified identifier
					obj := c.p.Uses[x.Sel].(*types.Var)
					return c.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, c.varPtrName(obj), c.typeName(exprType), c.objectName(obj), c.translateAssign(x, c.newIdent("$v", exprType), false))
				}
				newSel := &ast.SelectorExpr{X: c.newIdent("this.$target", c.p.TypeOf(x.X)), Sel: x.Sel}
				c.setType(newSel, exprType)
				c.p.Selections[newSel] = sel
				return c.formatExpr("(%1e.$ptr_%2s || (%1e.$ptr_%2s = new %3s(function() { return %4e; }, function($v) { %5s }, %1e)))", x.X, x.Sel.Name, c.typeName(exprType), newSel, c.translateAssign(newSel, c.newIdent("$v", exprType), false))
			case *ast.IndexExpr:
				if _, ok := c.p.TypeOf(x.X).Underlying().(*types.Slice); ok {
					return c.formatExpr("$indexPtr(%1e.$array, %1e.$offset + %2e, %3s)", x.X, x.Index, c.typeName(exprType))
				}

func (c *FuncInfo) Visit(node ast.Node) ast.Visitor {
	if node == nil {
		if len(c.analyzeStack) != 0 {
			c.analyzeStack = c.analyzeStack[:len(c.analyzeStack)-1]
		}
		return nil
	}
	c.analyzeStack = append(c.analyzeStack, node)

	switch n := node.(type) {
	case *ast.FuncDecl:
		newInfo := c.p.newFuncInfo()
		c.p.FuncDeclInfos[c.p.Defs[n.Name].(*types.Func)] = newInfo
		return newInfo
	case *ast.FuncLit:
		newInfo := c.p.newFuncInfo()
		c.p.FuncLitInfos[n] = newInfo
		return newInfo
	case *ast.BranchStmt:
		switch n.Tok {
		case token.GOTO:
			for _, n2 := range c.analyzeStack {
				c.Flattened[n2] = true
			}
			c.GotoLabel[c.p.Uses[n.Label].(*types.Label)] = true
		case token.CONTINUE:
			if n.Label != nil {
				label := c.p.Uses[n.Label].(*types.Label)
				for i := len(c.analyzeStack) - 1; i >= 0; i-- {
					if labelStmt, ok := c.analyzeStack[i].(*ast.LabeledStmt); ok && c.p.Defs[labelStmt.Label] == label {
						if _, ok := labelStmt.Stmt.(*ast.RangeStmt); ok {
							return nil
						}
						stack := make([]ast.Node, len(c.analyzeStack))
						copy(stack, c.analyzeStack)
						c.ContinueStmts = append(c.ContinueStmts, continueStmt{labelStmt.Stmt.(*ast.ForStmt), stack})
						return nil
					}
				}
				return nil
			}
			for i := len(c.analyzeStack) - 1; i >= 0; i-- {
				if _, ok := c.analyzeStack[i].(*ast.RangeStmt); ok {
					return nil
				}
				if forStmt, ok := c.analyzeStack[i].(*ast.ForStmt); ok {
					stack := make([]ast.Node, len(c.analyzeStack))
					copy(stack, c.analyzeStack)
					c.ContinueStmts = append(c.ContinueStmts, continueStmt{forStmt, stack})
					return nil
				}
			}
		}
	case *ast.CallExpr:
		callTo := func(obj types.Object) {
			switch o := obj.(type) {
			case *types.Func:
				if recv := o.Type().(*types.Signature).Recv(); recv != nil {
					if _, ok := recv.Type().Underlying().(*types.Interface); ok {
						c.markBlocking(c.analyzeStack)
						return
					}
				}
				if o.Pkg() != c.p.Pkg {
					if c.p.IsBlocking(o) {
						c.markBlocking(c.analyzeStack)
					}
					return
				}
				stack := make([]ast.Node, len(c.analyzeStack))
				copy(stack, c.analyzeStack)
				c.LocalCalls[o] = append(c.LocalCalls[o], stack)
			case *types.Var:
				c.markBlocking(c.analyzeStack)
			}
		}
		switch f := astutil.RemoveParens(n.Fun).(type) {
		case *ast.Ident:
			callTo(c.p.Uses[f])
		case *ast.SelectorExpr:
			if sel := c.p.Selections[f]; sel != nil && typesutil.IsJsObject(sel.Recv()) {
				break
			}
			callTo(c.p.Uses[f.Sel])
		case *ast.FuncLit:
			ast.Walk(c, n.Fun)
			for _, arg := range n.Args {
				ast.Walk(c, arg)
			}
			if len(c.p.FuncLitInfos[f].Blocking) != 0 {
				c.markBlocking(c.analyzeStack)
			}
			return nil
		default:
			if !astutil.IsTypeExpr(f, c.p.Info) {
				c.markBlocking(c.analyzeStack)
			}
		}
	case *ast.SendStmt:
		c.markBlocking(c.analyzeStack)
//.........这里部分代码省略.........

func (c *funcContext) translateAssign(lhs, rhs ast.Expr, define bool) string {
	lhs = astutil.RemoveParens(lhs)
	if isBlank(lhs) {
		panic("translateAssign with blank lhs")
	}

	if l, ok := lhs.(*ast.IndexExpr); ok {
		if t, ok := c.p.TypeOf(l.X).Underlying().(*types.Map); ok {
			if typesutil.IsJsObject(c.p.TypeOf(l.Index)) {
				c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: l.Index.Pos(), Msg: "cannot use js.Object as map key"})
			}
			keyVar := c.newVariable("_key")
			return fmt.Sprintf(`%s = %s; (%s || $throwRuntimeError("assignment to entry in nil map"))[%s.keyFor(%s)] = { k: %s, v: %s };`, keyVar, c.translateImplicitConversionWithCloning(l.Index, t.Key()), c.translateExpr(l.X), c.typeName(t.Key()), keyVar, keyVar, c.translateImplicitConversionWithCloning(rhs, t.Elem()))
		}
	}

	lhsType := c.p.TypeOf(lhs)
	rhsExpr := c.translateImplicitConversion(rhs, lhsType)
	if _, ok := rhs.(*ast.CompositeLit); ok && define {
		return fmt.Sprintf("%s = %s;", c.translateExpr(lhs), rhsExpr) // skip $copy
	}

	isReflectValue := false
	if named, ok := lhsType.(*types.Named); ok && named.Obj().Pkg() != nil && named.Obj().Pkg().Path() == "reflect" && named.Obj().Name() == "Value" {
		isReflectValue = true
	}
	if !isReflectValue { // this is a performance hack, but it is safe since reflect.Value has no exported fields and the reflect package does not violate this assumption
		switch lhsType.Underlying().(type) {
		case *types.Array, *types.Struct:
			if define {
				return fmt.Sprintf("%s = $clone(%s, %s);", c.translateExpr(lhs), rhsExpr, c.typeName(lhsType))
			}
			return fmt.Sprintf("%s.copy(%s, %s);", c.typeName(lhsType), c.translateExpr(lhs), rhsExpr)
		}
	}

	switch l := lhs.(type) {
	case *ast.Ident:
		return fmt.Sprintf("%s = %s;", c.objectName(c.p.ObjectOf(l)), rhsExpr)
	case *ast.SelectorExpr:
		sel, ok := c.p.SelectionOf(l)
		if !ok {
			// qualified identifier
			return fmt.Sprintf("%s = %s;", c.objectName(c.p.Uses[l.Sel]), rhsExpr)
		}
		fields, jsTag := c.translateSelection(sel, l.Pos())
		if jsTag != "" {
			return fmt.Sprintf("%s.%s.%s = %s;", c.translateExpr(l.X), strings.Join(fields, "."), jsTag, c.externalize(rhsExpr.String(), sel.Type()))
		}
		return fmt.Sprintf("%s.%s = %s;", c.translateExpr(l.X), strings.Join(fields, "."), rhsExpr)
	case *ast.StarExpr:
		return fmt.Sprintf("%s.$set(%s);", c.translateExpr(l.X), rhsExpr)
	case *ast.IndexExpr:
		switch t := c.p.TypeOf(l.X).Underlying().(type) {
		case *types.Array, *types.Pointer:
			pattern := rangeCheck("%1e[%2f] = %3s", c.p.Types[l.Index].Value != nil, true)
			if _, ok := t.(*types.Pointer); ok { // check pointer for nil (attribute getter causes a panic)
				pattern = `%1e.nilCheck, ` + pattern
			}
			return c.formatExpr(pattern, l.X, l.Index, rhsExpr).String() + ";"
		case *types.Slice:
			return c.formatExpr(rangeCheck("%1e.$array[%1e.$offset + %2f] = %3s", c.p.Types[l.Index].Value != nil, false), l.X, l.Index, rhsExpr).String() + ";"
		default:
			panic(fmt.Sprintf("Unhandled lhs type: %T\n", t))
		}
	default:
		panic(fmt.Sprintf("Unhandled lhs type: %T\n", l))
	}
}