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// Copyright 2017 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package json
import (
"encoding/binary"
"unicode/utf8"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/terror"
)
// TypeCode indicates JSON type.
type TypeCode = byte
const (
// TypeCodeObject indicates the JSON is an object.
TypeCodeObject TypeCode = 0x01
// TypeCodeArray indicates the JSON is an array.
TypeCodeArray TypeCode = 0x03
// TypeCodeLiteral indicates the JSON is a literal.
TypeCodeLiteral TypeCode = 0x04
// TypeCodeInt64 indicates the JSON is a signed integer.
TypeCodeInt64 TypeCode = 0x09
// TypeCodeUint64 indicates the JSON is a unsigned integer.
TypeCodeUint64 TypeCode = 0x0a
// TypeCodeFloat64 indicates the JSON is a double float number.
TypeCodeFloat64 TypeCode = 0x0b
// TypeCodeString indicates the JSON is a string.
TypeCodeString TypeCode = 0x0c
)
const (
// LiteralNil represents JSON null.
LiteralNil byte = 0x00
// LiteralTrue represents JSON true.
LiteralTrue byte = 0x01
// LiteralFalse represents JSON false.
LiteralFalse byte = 0x02
)
const unknownTypeCodeErrorMsg = "unknown type code: %d"
const unknownTypeErrorMsg = "unknown type: %s"
// htmlSafeSet holds the value true if the ASCII character with the given
// array position can be safely represented inside a JSON string, embedded
// inside of HTML <script> tags, without any additional escaping.
//
// All values are true except for the ASCII control characters (0-31), the
// double quote ("), the backslash character ("\"), HTML opening and closing
// tags ("<" and ">"), and the ampersand ("&").
var htmlSafeSet = [utf8.RuneSelf]bool{
' ': true,
'!': true,
'"': false,
'#': true,
'$': true,
'%': true,
'&': false,
'\'': true,
'(': true,
')': true,
'*': true,
'+': true,
',': true,
'-': true,
'.': true,
'/': true,
'0': true,
'1': true,
'2': true,
'3': true,
'4': true,
'5': true,
'6': true,
'7': true,
'8': true,
'9': true,
':': true,
';': true,
'<': false,
'=': true,
'>': false,
'?': true,
'@': true,
'A': true,
'B': true,
'C': true,
'D': true,
'E': true,
'F': true,
'G': true,
'H': true,
'I': true,
'J': true,
'K': true,
'L': true,
'M': true,
'N': true,
'O': true,
'P': true,
'Q': true,
'R': true,
'S': true,
'T': true,
'U': true,
'V': true,
'W': true,
'X': true,
'Y': true,
'Z': true,
'[': true,
'\\': false,
']': true,
'^': true,
'_': true,
'`': true,
'a': true,
'b': true,
'c': true,
'd': true,
'e': true,
'f': true,
'g': true,
'h': true,
'i': true,
'j': true,
'k': true,
'l': true,
'm': true,
'n': true,
'o': true,
'p': true,
'q': true,
'r': true,
's': true,
't': true,
'u': true,
'v': true,
'w': true,
'x': true,
'y': true,
'z': true,
'{': true,
'|': true,
'}': true,
'~': true,
'\u007f': true,
}
var (
hexChars = "0123456789abcdef"
endian = binary.LittleEndian
)
const (
headerSize = 8 // element size + data size.
dataSizeOff = 4
keyEntrySize = 6 // keyOff + keyLen
keyLenOff = 4
valTypeSize = 1
valEntrySize = 5
)
// jsonTypePrecedences is for comparing two json.
// See: https://dev.mysql.com/doc/refman/5.7/en/json.html#json-comparison
var jsonTypePrecedences = map[string]int{
"BLOB": -1,
"BIT": -2,
"OPAQUE": -3,
"DATETIME": -4,
"TIME": -5,
"DATE": -6,
"BOOLEAN": -7,
"ARRAY": -8,
"OBJECT": -9,
"STRING": -10,
"INTEGER": -11,
"UNSIGNED INTEGER": -11,
"DOUBLE": -11,
"NULL": -12,
}
// ModifyType is for modify a JSON. There are three valid values:
// ModifyInsert, ModifyReplace and ModifySet.
type ModifyType byte
const (
// ModifyInsert is for insert a new element into a JSON.
ModifyInsert ModifyType = 0x01
// ModifyReplace is for replace an old elemList from a JSON.
ModifyReplace ModifyType = 0x02
// ModifySet = ModifyInsert | ModifyReplace
ModifySet ModifyType = 0x03
)
var (
// ErrInvalidJSONText means invalid JSON text.
ErrInvalidJSONText = terror.ClassJSON.New(mysql.ErrInvalidJSONText, mysql.MySQLErrName[mysql.ErrInvalidJSONText])
// ErrInvalidJSONPath means invalid JSON path.
ErrInvalidJSONPath = terror.ClassJSON.New(mysql.ErrInvalidJSONPath, mysql.MySQLErrName[mysql.ErrInvalidJSONPath])
// ErrInvalidJSONData means invalid JSON data.
ErrInvalidJSONData = terror.ClassJSON.New(mysql.ErrInvalidJSONData, mysql.MySQLErrName[mysql.ErrInvalidJSONData])
// ErrInvalidJSONPathWildcard means invalid JSON path that contain wildcard characters.
ErrInvalidJSONPathWildcard = terror.ClassJSON.New(mysql.ErrInvalidJSONPathWildcard, mysql.MySQLErrName[mysql.ErrInvalidJSONPathWildcard])
// ErrInvalidJSONContainsPathType means invalid JSON contains path type.
ErrInvalidJSONContainsPathType = terror.ClassJSON.New(mysql.ErrInvalidJSONContainsPathType, mysql.MySQLErrName[mysql.ErrInvalidJSONContainsPathType])
)
func init() {
terror.ErrClassToMySQLCodes[terror.ClassJSON] = map[terror.ErrCode]uint16{
mysql.ErrInvalidJSONText: mysql.ErrInvalidJSONText,
mysql.ErrInvalidJSONPath: mysql.ErrInvalidJSONPath,
mysql.ErrInvalidJSONData: mysql.ErrInvalidJSONData,
mysql.ErrInvalidJSONPathWildcard: mysql.ErrInvalidJSONPathWildcard,
mysql.ErrInvalidJSONContainsPathType: mysql.ErrInvalidJSONContainsPathType,
}
}
// json_contains_path function type choices
// See: https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-contains-path
const (
// 'all': 1 if all paths exist within the document, 0 otherwise.
ContainsPathAll = "all"
// 'one': 1 if at least one path exists within the document, 0 otherwise.
ContainsPathOne = "one"
)
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