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types.go
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types.go
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package checker
import (
"reflect"
"github.com/byte-power/jsexpr/ast"
"github.com/byte-power/jsexpr/utility"
)
var (
nilType = reflect.TypeOf(nil)
boolType = reflect.TypeOf(true)
integerType = reflect.TypeOf(int(0))
floatType = reflect.TypeOf(float64(0))
stringType = reflect.TypeOf("")
arrayType = reflect.TypeOf([]interface{}{})
mapType = reflect.TypeOf(map[string]interface{}{})
interfaceType = reflect.TypeOf(new(interface{})).Elem()
)
func typeWeight(t reflect.Type) int {
switch t.Kind() {
case reflect.Uint:
return 1
case reflect.Uint8:
return 2
case reflect.Uint16:
return 3
case reflect.Uint32:
return 4
case reflect.Uint64:
return 5
case reflect.Int:
return 6
case reflect.Int8:
return 7
case reflect.Int16:
return 8
case reflect.Int32:
return 9
case reflect.Int64:
return 10
case reflect.Float32:
return 11
case reflect.Float64:
return 12
default:
return 0
}
}
func combined(a, b reflect.Type) reflect.Type {
if typeWeight(a) > typeWeight(b) {
return a
} else {
return b
}
}
func dereference(t reflect.Type) reflect.Type {
if t == nil {
return nil
}
if t.Kind() == reflect.Ptr {
t = dereference(t.Elem())
}
return t
}
func isComparable(l, r reflect.Type) bool {
l = dereference(l)
r = dereference(r)
if l == nil || r == nil { // It is possible to compare with nil.
return true
}
if l.Kind() == r.Kind() {
return true
}
if isInterface(l) || isInterface(r) {
return true
}
return false
}
func isInterface(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Interface:
return true
}
}
return false
}
func isInteger(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fallthrough
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return true
case reflect.Interface:
return true
}
}
return false
}
func isFloat(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Float32, reflect.Float64:
return true
case reflect.Interface:
return true
}
}
return false
}
func isNumber(t reflect.Type) bool {
return isInteger(t) || isFloat(t)
}
func isBool(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Bool:
return true
case reflect.Interface:
return true
}
}
return false
}
func isString(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.String:
return true
case reflect.Interface:
return true
}
}
return false
}
func isArray(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Slice, reflect.Array:
return true
case reflect.Interface:
return true
}
}
return false
}
func isMap(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Map:
return true
case reflect.Interface:
return true
}
}
return false
}
func isStruct(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Struct:
return true
}
}
return false
}
func isFunc(t reflect.Type) bool {
t = dereference(t)
if t != nil {
switch t.Kind() {
case reflect.Func:
return true
}
}
return false
}
func fieldType(ntype reflect.Type, name string) (reflect.Type, bool) {
ntype = dereference(ntype)
if ntype != nil {
switch ntype.Kind() {
case reflect.Interface:
return interfaceType, true
case reflect.Struct:
// First check all struct's fields.
for i := 0; i < ntype.NumField(); i++ {
f := ntype.Field(i)
tagName := utility.GetFieldTagName(f)
if tagName == name {
return f.Type, true
}
}
// Second check fields of embedded structs.
for i := 0; i < ntype.NumField(); i++ {
f := ntype.Field(i)
if f.Anonymous {
if t, ok := fieldType(f.Type, name); ok {
return t, true
}
}
}
if method, ok := ntype.MethodByName("FetchProperty"); ok {
// this field implemented PropertyProvider interface{}
return method.Type.Out(0), true
}
case reflect.Map:
return ntype.Elem(), true
}
}
return nil, false
}
func methodType(t reflect.Type, name string) (reflect.Type, bool, bool) {
if t != nil {
// First, check methods defined on type itself,
// independent of which type it is.
if m, ok := t.MethodByName(name); ok {
if t.Kind() == reflect.Interface {
// In case of interface type method will not have a receiver,
// and to prevent checker decreasing numbers of in arguments
// return method type as not method (second argument is false).
return m.Type, false, true
} else {
return m.Type, true, true
}
}
for i := 0; i < t.NumMethod(); i++ {
method := t.Method(i)
if utility.StrToLowerCamel(method.Name) != name {
continue
}
return method.Type, t.Kind() != reflect.Interface, true
}
d := t
if t.Kind() == reflect.Ptr {
d = t.Elem()
}
switch d.Kind() {
case reflect.Interface:
return interfaceType, false, true
case reflect.Struct:
// First, check all struct's fields.
for i := 0; i < d.NumField(); i++ {
f := d.Field(i)
if !f.Anonymous && f.Name == name {
return f.Type, false, true
}
}
// Second, check fields of embedded structs.
for i := 0; i < d.NumField(); i++ {
f := d.Field(i)
if f.Anonymous {
if t, method, ok := methodType(f.Type, name); ok {
return t, method, true
}
}
}
case reflect.Map:
return d.Elem(), false, true
}
}
return nil, false, false
}
func indexType(ntype reflect.Type) (reflect.Type, bool) {
ntype = dereference(ntype)
if ntype == nil {
return nil, false
}
switch ntype.Kind() {
case reflect.Interface:
return interfaceType, true
case reflect.Map, reflect.Array, reflect.Slice:
return ntype.Elem(), true
}
return nil, false
}
func isFuncType(ntype reflect.Type) (reflect.Type, bool) {
ntype = dereference(ntype)
if ntype == nil {
return nil, false
}
switch ntype.Kind() {
case reflect.Interface:
return interfaceType, true
case reflect.Func:
return ntype, true
}
return nil, false
}
func isIntegerOrArithmeticOperation(node ast.Node) bool {
switch n := node.(type) {
case *ast.IntegerNode:
return true
case *ast.UnaryNode:
switch n.Operator {
case "+", "-":
return true
}
case *ast.BinaryNode:
switch n.Operator {
case "+", "/", "-", "*":
return true
}
}
return false
}
func setTypeForIntegers(node ast.Node, t reflect.Type) {
switch n := node.(type) {
case *ast.IntegerNode:
n.SetType(t)
case *ast.UnaryNode:
switch n.Operator {
case "+", "-":
setTypeForIntegers(n.Node, t)
}
case *ast.BinaryNode:
switch n.Operator {
case "+", "/", "-", "*":
setTypeForIntegers(n.Left, t)
setTypeForIntegers(n.Right, t)
}
}
}