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token.go
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token.go
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// Copyright 2019 Santhosh Kumar Tekuri
//
// 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
//
// https://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 json
import (
"strconv"
)
// Kind tells the kind of json token.
type Kind byte
const (
none Kind = iota
EOD
EOF
Str
Num
Bool
Null
Error
ObjEnd Kind = '}'
ObjBegin Kind = '{'
ArrEnd Kind = ']'
ArrBegin Kind = '['
)
var kindNames = []string{
`<none>`,
`<eod>`, `<eof>`,
`<string>`, `<number>`, `<boolean>`, `<null>`,
`<error>`,
}
func (k Kind) String() string {
if int(k) < len(kindNames) {
return kindNames[k]
}
return string(k)
}
// Token holds a value of json token.
type Token struct {
Kind Kind
Data []byte
Err error
}
// Error tells whether token is an error.
func (t Token) Error() bool {
return t.Kind == Error
}
// UnexpectedEOF tells whether token is an unexpectedEOF error.
func (t Token) UnexpectedEOF() bool {
return t.Kind == Error && IsUnexpectedEOF(t.Err)
}
func (t Token) EOD() bool {
return t.Kind == EOD
}
func (t Token) EOF() bool {
return t.Kind == EOF
}
func (t Token) Begin() bool {
return t.Kind == ObjBegin || t.Kind == ArrBegin
}
func (t Token) End() bool {
return t.Kind == ObjEnd || t.Kind == ArrEnd
}
func (t Token) Null() bool {
return t.Kind == Null
}
func (t Token) Obj(context string) error {
switch t.Kind {
case Error:
return t.Err
case ObjBegin:
return nil
default:
return &UnmarshalError{context, "object"}
}
}
func (t Token) Arr(context string) error {
switch t.Kind {
case Error:
return t.Err
case ArrBegin:
return nil
default:
return &UnmarshalError{context, "array"}
}
}
func (t Token) String(context string) (string, error) {
switch t.Kind {
case Error:
return "", t.Err
case Null:
return "", nil
case Str:
s, _ := unquoteBytes(t.Data)
return string(s), nil
default:
return "", &UnmarshalError{context, "string"}
}
}
func (t Token) Number(context string) (Number, error) {
switch t.Kind {
case Error:
return "", t.Err
case Null:
return Number("0"), nil
case Num:
return Number(t.Data), nil
default:
return "", &UnmarshalError{context, "number"}
}
}
// Float64 returns the number as a float64.
func (t Token) Float64(context string) (float64, error) {
switch t.Kind {
case Error:
return 0, t.Err
case Null:
return 0, nil
case Num:
return strconv.ParseFloat(string(t.Data), 64)
default:
return 0, &UnmarshalError{context, "number"}
}
}
// Int64 returns the number as an int64.
func (t Token) Int64(context string) (int64, error) {
switch t.Kind {
case Error:
return 0, t.Err
case Null:
return 0, nil
case Num:
i, err := strconv.ParseInt(string(t.Data), 10, 64)
if err != nil {
return 0, &UnmarshalError{context, "integer, got number " + string(t.Data)}
}
return i, nil
default:
return 0, &UnmarshalError{context, "integer"}
}
}
// Int returns the number as an int.
func (t Token) Int(context string) (int, error) {
i, err := t.Int64(context)
return int(i), err
}
// Bool returns the boolean value. For Null token it returns false.
// If token is not boolean/null, returns *UnmarshalError with context provided.
func (t Token) Bool(context string) (bool, error) {
switch t.Kind {
case Error:
return false, t.Err
case Null:
return false, nil
case Bool:
return t.Data[0] == 't', nil
default:
return false, &UnmarshalError{context, "boolean"}
}
}
// number ---
// A Number represents a JSON number literal.
type Number string
// String returns the literal text of the number.
func (n Number) String() string { return string(n) }
// Float64 returns the number as a float64.
func (n Number) Float64() (float64, error) {
return strconv.ParseFloat(string(n), 64)
}
// Int64 returns the number as an int64.
func (n Number) Int64() (int64, error) {
return strconv.ParseInt(string(n), 10, 64)
}
// Int returns the number as an int.
func (n Number) Int() (int, error) {
i, err := n.Int64()
return int(i), err
}