/
types.go
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/
types.go
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/*
* Copyright 2022 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package defs
import (
`fmt`
`reflect`
`strings`
`sync`
`unicode`
`github.com/cloudwego/frugal/internal/utils`
)
type Tag uint8
const (
T_bool Tag = 2
T_i8 Tag = 3
T_double Tag = 4
T_i16 Tag = 6
T_i32 Tag = 8
T_i64 Tag = 10
T_string Tag = 11
T_struct Tag = 12
T_map Tag = 13
T_set Tag = 14
T_list Tag = 15
T_enum Tag = 0x80
T_binary Tag = 0x81
T_pointer Tag = 0x82
)
var wireTags = [256]bool {
T_bool : true,
T_i8 : true,
T_double : true,
T_i16 : true,
T_i32 : true,
T_i64 : true,
T_string : true,
T_struct : true,
T_map : true,
T_set : true,
T_list : true,
}
var keywordTab = [256]string {
T_bool : "bool",
T_i8 : "i8 byte",
T_double : "double",
T_i16 : "i16",
T_i32 : "i32",
T_i64 : "i64",
T_string : "string",
T_binary : "binary",
T_struct : "struct",
T_map : "map",
}
var (
i64type = reflect.TypeOf(int64(0))
)
func T_int() Tag {
switch IntSize {
case 4 : return T_i32
case 8 : return T_i64
default : panic("invalid int size")
}
}
func (self Tag) IsWireTag() bool {
return wireTags[self]
}
type Type struct {
T Tag
K *Type
V *Type
S reflect.Type
}
var (
typePool sync.Pool
)
func newType() *Type {
if v := typePool.Get(); v == nil {
return new(Type)
} else {
return resetType(v.(*Type))
}
}
func resetType(p *Type) *Type {
*p = Type{}
return p
}
func (self *Type) Tag() Tag {
switch self.T {
case T_enum : return T_i32
case T_binary : return T_string
case T_pointer : return self.V.Tag()
default : return self.T
}
}
func (self *Type) Free() {
typePool.Put(self)
}
func (self *Type) String() string {
switch self.T {
case T_bool : return "bool"
case T_i8 : return "i8"
case T_double : return "double"
case T_i16 : return "i16"
case T_i32 : return "i32"
case T_i64 : return "i64"
case T_string : return "string"
case T_struct : return self.S.Name()
case T_map : return fmt.Sprintf("map<%s:%s>", self.K.String(), self.V.String())
case T_set : return fmt.Sprintf("set<%s>", self.V.String())
case T_list : return fmt.Sprintf("list<%s>", self.V.String())
case T_enum : return "enum"
case T_binary : return "binary"
case T_pointer : return "*" + self.V.String()
default : return fmt.Sprintf("Type(Tag(%d))", self.T)
}
}
func (self *Type) IsKeyType() bool {
switch self.T {
case T_bool : return true
case T_i8 : return true
case T_double : return true
case T_i16 : return true
case T_i32 : return true
case T_i64 : return true
case T_string : return true
case T_enum : return true
case T_pointer : return self.V.T == T_struct
default : return false
}
}
func (self *Type) IsValueType() bool {
return self.T != T_pointer || self.V.T == T_struct
}
func (self *Type) IsSimpleType() bool {
switch self.T {
case T_bool : return true
case T_i8 : return true
case T_double : return true
case T_i16 : return true
case T_i32 : return true
case T_i64 : return true
case T_string : return true
case T_enum : return true
default : return false
}
}
func ParseType(vt reflect.Type, def string) (*Type, error) {
var i int
return doParseType(vt, def, &i, true)
}
func isident(c byte) bool {
return isident0(c) || c >= '0' && c <= '9'
}
func isident0(c byte) bool {
return c == '_' || c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z'
}
func readToken(src string, i *int, eofok bool) (string, error) {
p := *i
n := len(src)
/* skip the spaces */
for p < n && unicode.IsSpace(rune(src[p])) {
p++
}
/* check for EOF */
if p == n {
if eofok {
return "", nil
} else {
return "", utils.ESyntax(p, src, "unexpected EOF")
}
}
/* skip the character */
q := p
p++
/* check for identifiers */
if isident0(src[q]) {
for p < n && isident(src[p]) {
p++
}
}
/* slice the source */
*i = p
return src[q:p], nil
}
func mkMistyped(pos int, src string, tv string, tag Tag, vt reflect.Type) utils.SyntaxError {
if tag != T_struct {
return utils.ESyntax(pos, src, fmt.Sprintf("type mismatch, %s expected, got %s", keywordTab[tag], tv))
} else {
return utils.ESyntax(pos, src, fmt.Sprintf("struct name mismatch, %s expected, got %s", vt.Name(), tv))
}
}
func doParseType(vt reflect.Type, def string, i *int, allowPtrs bool) (*Type, error) {
var tag Tag
var err error
var ret *Type
/* dereference the pointer if possible */
if ret = newType(); vt.Kind() == reflect.Ptr {
ret.S = vt
ret.T = T_pointer
/* prohibit nested pointers */
if !allowPtrs {
return nil, utils.EType(ret.V.S, "nested pointer is not allowed")
}
/* parse the pointer element recursively */
if ret.V, err = doParseType(vt.Elem(), def, i, false); err != nil {
return nil, err
} else {
return ret, nil
}
}
/* check for value kind */
switch vt.Kind() {
case reflect.Bool : tag = T_bool
case reflect.Int : tag = T_int()
case reflect.Int8 : tag = T_i8
case reflect.Int16 : tag = T_i16
case reflect.Int32 : tag = T_i32
case reflect.Int64 : tag = T_i64
case reflect.Uint : return nil, utils.EUseOther(vt, "int")
case reflect.Uint8 : return nil, utils.EUseOther(vt, "int8")
case reflect.Uint16 : return nil, utils.EUseOther(vt, "int16")
case reflect.Uint32 : return nil, utils.EUseOther(vt, "int32")
case reflect.Uint64 : return nil, utils.EUseOther(vt, "int64")
case reflect.Float32 : return nil, utils.EUseOther(vt, "float64")
case reflect.Float64 : tag = T_double
case reflect.Array : return nil, utils.EUseOther(vt, "[]" + vt.Elem().String())
case reflect.Map : tag = T_map
case reflect.Slice : break
case reflect.String : tag = T_string
case reflect.Struct : tag = T_struct
default : return nil, utils.EType(vt, "unsupported type")
}
/* it's a slice, check for byte slice */
if tag == 0 {
if et := vt.Elem(); utils.IsByteType(et) {
tag = T_binary
} else if def == "" {
return nil, utils.ESetList(*i, def, et)
} else {
return doParseSlice(vt, et, def, i, ret)
}
}
/* match the type if any */
if def != "" {
if tv, et := readToken(def, i, false); et != nil {
return nil, et
} else if !strings.Contains(keywordTab[tag], tv) {
if !isident0(tv[0]) {
return nil, mkMistyped(*i - len(tv), def, tv, tag, vt)
} else if ok, ex := doMatchStruct(vt, def, i, &tv); ex != nil {
return nil, ex
} else if !ok {
return nil, mkMistyped(*i - len(tv), def, tv, tag, vt)
} else if tag == T_i64 && vt != i64type {
tag = T_enum
}
}
}
/* simple types */
if tag != T_map {
ret.S = vt
ret.T = tag
return ret, nil
}
/* map begin */
if def != "" {
if tk, et := readToken(def, i, false); et != nil {
return nil, et
} else if tk != "<" {
return nil, utils.ESyntax(*i - len(tk), def, "'<' expected")
}
}
/* parse the key type */
if ret.K, err = doParseType(vt.Key(), def, i, true); err != nil {
return nil, err
}
/* validate map key */
if !ret.K.IsKeyType() {
return nil, utils.EType(ret.K.S, "not a valid map key type")
}
/* key-value delimiter */
if def != "" {
if tk, et := readToken(def, i, false); et != nil {
return nil, et
} else if tk != ":" {
return nil, utils.ESyntax(*i - len(tk), def, "':' expected")
}
}
/* parse the value type */
if ret.V, err = doParseType(vt.Elem(), def, i, true); err != nil {
return nil, err
}
/* map end */
if def != "" {
if tk, et := readToken(def, i, false); et != nil {
return nil, et
} else if tk != ">" {
return nil, utils.ESyntax(*i - len(tk), def, "'>' expected")
}
}
/* check for list elements */
if !ret.V.IsValueType() {
return nil, utils.EType(ret.V.S, "non-struct pointers are not valid map value types")
}
/* set the type tag */
ret.S = vt
ret.T = T_map
return ret, nil
}
func doParseSlice(vt reflect.Type, et reflect.Type, def string, i *int, rt *Type) (*Type, error) {
var err error
var tok string
/* read the next token */
if tok, err = readToken(def, i, false); err != nil {
return nil, err
}
/* identify "set" or "list" */
if tok == "set" {
rt.T = T_set
} else if tok == "list" {
rt.T = T_list
} else {
return nil, utils.ESyntax(*i - len(tok), def, `"set" or "list" expected`)
}
/* list or set begin */
if tok, err = readToken(def, i, false); err != nil {
return nil, err
} else if tok != "<" {
return nil, utils.ESyntax(*i - len(tok), def, "'<' expected")
}
/* set or list element */
if rt.V, err = doParseType(et, def, i, true); err != nil {
return nil, err
}
/* list or set end */
if tok, err = readToken(def, i, false); err != nil {
return nil, err
} else if tok != ">" {
return nil, utils.ESyntax(*i - len(tok), def, "'>' expected")
}
/* check for list elements */
if !rt.V.IsValueType() {
return nil, utils.EType(rt.V.S, "non-struct pointers are not valid list/set elements")
}
/* set the type */
rt.S = vt
return rt, nil
}
func doMatchStruct(vt reflect.Type, def string, i *int, tv *string) (bool, error) {
var err error
var tok string
/* mark the starting position */
sp := *i
tn := vt.Name()
/* read the next token */
if tok, err = readToken(def, &sp, true); err != nil {
return false, err
}
/* anonymous struct */
if tn == "" && vt.Kind() == reflect.Struct {
return true, nil
}
/* just a simple type with no qualifiers */
if tok == "" || tok == ":" || tok == ">" {
return tn == *tv, nil
}
/* otherwise, it must be a "." */
if tok != "." {
return false, utils.ESyntax(sp, def, "'.' or '>' expected")
}
/* must be an identifier */
if *tv, err = readToken(def, &sp, false); err != nil {
return false, err
} else if !isident0((*tv)[0]) {
return false, utils.ESyntax(sp, def, "struct name expected")
}
/* update parsing position */
*i = sp
return tn == *tv, nil
}