How to use Parse method of json Package

Best Go-testdeep code snippet using json.Parse

gjson.go

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...158 return 0159 case True:160 return 1161 case String:162 n, _ := strconv.ParseFloat(t.Str, 64)163 return n164 case Number:165 return t.Num166 }167}168// Time returns a time.Time representation.169func (t Result) Time() time.Time {170 res, _ := time.Parse(time.RFC3339, t.String())171 return res172}173// Array returns back an array of values.174// If the result represents a non-existent value, then an empty array will be175// returned. If the result is not a JSON array, the return value will be an176// array containing one result.177func (t Result) Array() []Result {178 if t.Type == Null {179 return []Result{}180 }181 if t.Type != JSON {182 return []Result{t}183 }184 r := t.arrayOrMap('[', false)185 return r.a186}187// IsObject returns true if the result value is a JSON object.188func (t Result) IsObject() bool {189 return t.Type == JSON && len(t.Raw) > 0 && t.Raw[0] == '{'190}191// IsArray returns true if the result value is a JSON array.192func (t Result) IsArray() bool {193 return t.Type == JSON && len(t.Raw) > 0 && t.Raw[0] == '['194}195// ForEach iterates through values.196// If the result represents a non-existent value, then no values will be197// iterated. If the result is an Object, the iterator will pass the key and198// value of each item. If the result is an Array, the iterator will only pass199// the value of each item. If the result is not a JSON array or object, the200// iterator will pass back one value equal to the result.201func (t Result) ForEach(iterator func(key, value Result) bool) {202 if !t.Exists() {203 return204 }205 if t.Type != JSON {206 iterator(Result{}, t)207 return208 }209 json := t.Raw210 var keys bool211 var i int212 var key, value Result213 for ; i < len(json); i++ {214 if json[i] == '{' {215 i++216 key.Type = String217 keys = true218 break219 } else if json[i] == '[' {220 i++221 break222 }223 if json[i] > ' ' {224 return225 }226 }227 var str string228 var vesc bool229 var ok bool230 for ; i < len(json); i++ {231 if keys {232 if json[i] != '"' {233 continue234 }235 s := i236 i, str, vesc, ok = parseString(json, i+1)237 if !ok {238 return239 }240 if vesc {241 key.Str = unescape(str[1 : len(str)-1])242 } else {243 key.Str = str[1 : len(str)-1]244 }245 key.Raw = str246 key.Index = s247 }248 for ; i < len(json); i++ {249 if json[i] <= ' ' || json[i] == ',' || json[i] == ':' {250 continue251 }252 break253 }254 s := i255 i, value, ok = parseAny(json, i, true)256 if !ok {257 return258 }259 value.Index = s260 if !iterator(key, value) {261 return262 }263 }264}265// Map returns back an map of values. The result should be a JSON array.266func (t Result) Map() map[string]Result {267 if t.Type != JSON {268 return map[string]Result{}269 }270 r := t.arrayOrMap('{', false)271 return r.o272}273// Get searches result for the specified path.274// The result should be a JSON array or object.275func (t Result) Get(path string) Result {276 return Get(t.Raw, path)277}278type arrayOrMapResult struct {279 a []Result280 ai []interface{}281 o map[string]Result282 oi map[string]interface{}283 vc byte284}285func (t Result) arrayOrMap(vc byte, valueize bool) (r arrayOrMapResult) {286 var json = t.Raw287 var i int288 var value Result289 var count int290 var key Result291 if vc == 0 {292 for ; i < len(json); i++ {293 if json[i] == '{' || json[i] == '[' {294 r.vc = json[i]295 i++296 break297 }298 if json[i] > ' ' {299 goto end300 }301 }302 } else {303 for ; i < len(json); i++ {304 if json[i] == vc {305 i++306 break307 }308 if json[i] > ' ' {309 goto end310 }311 }312 r.vc = vc313 }314 if r.vc == '{' {315 if valueize {316 r.oi = make(map[string]interface{})317 } else {318 r.o = make(map[string]Result)319 }320 } else {321 if valueize {322 r.ai = make([]interface{}, 0)323 } else {324 r.a = make([]Result, 0)325 }326 }327 for ; i < len(json); i++ {328 if json[i] <= ' ' {329 continue330 }331 // get next value332 if json[i] == ']' || json[i] == '}' {333 break334 }335 switch json[i] {336 default:337 if (json[i] >= '0' && json[i] <= '9') || json[i] == '-' {338 value.Type = Number339 value.Raw, value.Num = tonum(json[i:])340 value.Str = ""341 } else {342 continue343 }344 case '{', '[':345 value.Type = JSON346 value.Raw = squash(json[i:])347 value.Str, value.Num = "", 0348 case 'n':349 value.Type = Null350 value.Raw = tolit(json[i:])351 value.Str, value.Num = "", 0352 case 't':353 value.Type = True354 value.Raw = tolit(json[i:])355 value.Str, value.Num = "", 0356 case 'f':357 value.Type = False358 value.Raw = tolit(json[i:])359 value.Str, value.Num = "", 0360 case '"':361 value.Type = String362 value.Raw, value.Str = tostr(json[i:])363 value.Num = 0364 }365 i += len(value.Raw) - 1366 if r.vc == '{' {367 if count%2 == 0 {368 key = value369 } else {370 if valueize {371 if _, ok := r.oi[key.Str]; !ok {372 r.oi[key.Str] = value.Value()373 }374 } else {375 if _, ok := r.o[key.Str]; !ok {376 r.o[key.Str] = value377 }378 }379 }380 count++381 } else {382 if valueize {383 r.ai = append(r.ai, value.Value())384 } else {385 r.a = append(r.a, value)386 }387 }388 }389end:390 return391}392// Parse parses the json and returns a result.393//394// This function expects that the json is well-formed, and does not validate.395// Invalid json will not panic, but it may return back unexpected results.396// If you are consuming JSON from an unpredictable source then you may want to397// use the Valid function first.398func Parse(json string) Result {399 var value Result400 for i := 0; i < len(json); i++ {401 if json[i] == '{' || json[i] == '[' {402 value.Type = JSON403 value.Raw = json[i:] // just take the entire raw404 break405 }406 if json[i] <= ' ' {407 continue408 }409 switch json[i] {410 default:411 if (json[i] >= '0' && json[i] <= '9') || json[i] == '-' {412 value.Type = Number413 value.Raw, value.Num = tonum(json[i:])414 } else {415 return Result{}416 }417 case 'n':418 value.Type = Null419 value.Raw = tolit(json[i:])420 case 't':421 value.Type = True422 value.Raw = tolit(json[i:])423 case 'f':424 value.Type = False425 value.Raw = tolit(json[i:])426 case '"':427 value.Type = String428 value.Raw, value.Str = tostr(json[i:])429 }430 break431 }432 return value433}434// ParseBytes parses the json and returns a result.435// If working with bytes, this method preferred over Parse(string(data))436func ParseBytes(json []byte) Result {437 return Parse(string(json))438}439func squash(json string) string {440 // expects that the lead character is a '[' or '{' or '(' or '"'441 // squash the value, ignoring all nested arrays and objects.442 var i, depth int443 if json[0] != '"' {444 i, depth = 1, 1445 }446 for ; i < len(json); i++ {447 if json[i] >= '"' && json[i] <= '}' {448 switch json[i] {449 case '"':450 i++451 s2 := i452 for ; i < len(json); i++ {453 if json[i] > '\\' {454 continue455 }456 if json[i] == '"' {457 // look for an escaped slash458 if json[i-1] == '\\' {459 n := 0460 for j := i - 2; j > s2-1; j-- {461 if json[j] != '\\' {462 break463 }464 n++465 }466 if n%2 == 0 {467 continue468 }469 }470 break471 }472 }473 if depth == 0 {474 return json[:i+1]475 }476 case '{', '[', '(':477 depth++478 case '}', ']', ')':479 depth--480 if depth == 0 {481 return json[:i+1]482 }483 }484 }485 }486 return json487}488func tonum(json string) (raw string, num float64) {489 for i := 1; i < len(json); i++ {490 // less than dash might have valid characters491 if json[i] <= '-' {492 if json[i] <= ' ' || json[i] == ',' {493 // break on whitespace and comma494 raw = json[:i]495 num, _ = strconv.ParseFloat(raw, 64)496 return497 }498 // could be a '+' or '-'. let's assume so.499 continue500 }501 if json[i] < ']' {502 // probably a valid number503 continue504 }505 if json[i] == 'e' || json[i] == 'E' {506 // allow for exponential numbers507 continue508 }509 // likely a ']' or '}'510 raw = json[:i]511 num, _ = strconv.ParseFloat(raw, 64)512 return513 }514 raw = json515 num, _ = strconv.ParseFloat(raw, 64)516 return517}518func tolit(json string) (raw string) {519 for i := 1; i < len(json); i++ {520 if json[i] < 'a' || json[i] > 'z' {521 return json[:i]522 }523 }524 return json525}526func tostr(json string) (raw string, str string) {527 // expects that the lead character is a '"'528 for i := 1; i < len(json); i++ {529 if json[i] > '\\' {530 continue531 }532 if json[i] == '"' {533 return json[:i+1], json[1:i]534 }535 if json[i] == '\\' {536 i++537 for ; i < len(json); i++ {538 if json[i] > '\\' {539 continue540 }541 if json[i] == '"' {542 // look for an escaped slash543 if json[i-1] == '\\' {544 n := 0545 for j := i - 2; j > 0; j-- {546 if json[j] != '\\' {547 break548 }549 n++550 }551 if n%2 == 0 {552 continue553 }554 }555 break556 }557 }558 var ret string559 if i+1 < len(json) {560 ret = json[:i+1]561 } else {562 ret = json[:i]563 }564 return ret, unescape(json[1:i])565 }566 }567 return json, json[1:]568}569// Exists returns true if value exists.570//571// if gjson.Get(json, "name.last").Exists(){572// println("value exists")573// }574func (t Result) Exists() bool {575 return t.Type != Null || len(t.Raw) != 0576}577// Value returns one of these types:578//579// bool, for JSON booleans580// float64, for JSON numbers581// Number, for JSON numbers582// string, for JSON string literals583// nil, for JSON null584// map[string]interface{}, for JSON objects585// []interface{}, for JSON arrays586//587func (t Result) Value() interface{} {588 if t.Type == String {589 return t.Str590 }591 switch t.Type {592 default:593 return nil594 case False:595 return false596 case Number:597 return t.Num598 case JSON:599 r := t.arrayOrMap(0, true)600 if r.vc == '{' {601 return r.oi602 } else if r.vc == '[' {603 return r.ai604 }605 return nil606 case True:607 return true608 }609}610func parseString(json string, i int) (int, string, bool, bool) {611 var s = i612 for ; i < len(json); i++ {613 if json[i] > '\\' {614 continue615 }616 if json[i] == '"' {617 return i + 1, json[s-1 : i+1], false, true618 }619 if json[i] == '\\' {620 i++621 for ; i < len(json); i++ {622 if json[i] > '\\' {623 continue624 }625 if json[i] == '"' {626 // look for an escaped slash627 if json[i-1] == '\\' {628 n := 0629 for j := i - 2; j > 0; j-- {630 if json[j] != '\\' {631 break632 }633 n++634 }635 if n%2 == 0 {636 continue637 }638 }639 return i + 1, json[s-1 : i+1], true, true640 }641 }642 break643 }644 }645 return i, json[s-1:], false, false646}647func parseNumber(json string, i int) (int, string) {648 var s = i649 i++650 for ; i < len(json); i++ {651 if json[i] <= ' ' || json[i] == ',' || json[i] == ']' ||652 json[i] == '}' {653 return i, json[s:i]654 }655 }656 return i, json[s:]657}658func parseLiteral(json string, i int) (int, string) {659 var s = i660 i++661 for ; i < len(json); i++ {662 if json[i] < 'a' || json[i] > 'z' {663 return i, json[s:i]664 }665 }666 return i, json[s:]667}668type arrayPathResult struct {669 part string670 path string671 pipe string672 piped bool673 more bool674 alogok bool675 arrch bool676 alogkey string677 query struct {678 on bool679 path string680 op string681 value string682 all bool683 }684}685func parseArrayPath(path string) (r arrayPathResult) {686 for i := 0; i < len(path); i++ {687 if path[i] == '|' {688 r.part = path[:i]689 r.pipe = path[i+1:]690 r.piped = true691 return692 }693 if path[i] == '.' {694 r.part = path[:i]695 r.path = path[i+1:]696 r.more = true697 return698 }699 if path[i] == '#' {700 r.arrch = true701 if i == 0 && len(path) > 1 {702 if path[1] == '.' {703 r.alogok = true704 r.alogkey = path[2:]705 r.path = path[:1]706 } else if path[1] == '[' || path[1] == '(' {707 // query708 r.query.on = true709 if true {710 qpath, op, value, _, fi, ok := parseQuery(path[i:])711 if !ok {712 // bad query, end now713 break714 }715 r.query.path = qpath716 r.query.op = op717 r.query.value = value718 i = fi - 1719 if i+1 < len(path) && path[i+1] == '#' {720 r.query.all = true721 }722 } else {723 var end byte724 if path[1] == '[' {725 end = ']'726 } else {727 end = ')'728 }729 i += 2730 // whitespace731 for ; i < len(path); i++ {732 if path[i] > ' ' {733 break734 }735 }736 s := i737 for ; i < len(path); i++ {738 if path[i] <= ' ' ||739 path[i] == '!' ||740 path[i] == '=' ||741 path[i] == '<' ||742 path[i] == '>' ||743 path[i] == '%' ||744 path[i] == end {745 break746 }747 }748 r.query.path = path[s:i]749 // whitespace750 for ; i < len(path); i++ {751 if path[i] > ' ' {752 break753 }754 }755 if i < len(path) {756 s = i757 if path[i] == '!' {758 if i < len(path)-1 && (path[i+1] == '=' ||759 path[i+1] == '%') {760 i++761 }762 } else if path[i] == '<' || path[i] == '>' {763 if i < len(path)-1 && path[i+1] == '=' {764 i++765 }766 } else if path[i] == '=' {767 if i < len(path)-1 && path[i+1] == '=' {768 s++769 i++770 }771 }772 i++773 r.query.op = path[s:i]774 // whitespace775 for ; i < len(path); i++ {776 if path[i] > ' ' {777 break778 }779 }780 s = i781 for ; i < len(path); i++ {782 if path[i] == '"' {783 i++784 s2 := i785 for ; i < len(path); i++ {786 if path[i] > '\\' {787 continue788 }789 if path[i] == '"' {790 // look for an escaped slash791 if path[i-1] == '\\' {792 n := 0793 for j := i - 2; j > s2-1; j-- {794 if path[j] != '\\' {795 break796 }797 n++798 }799 if n%2 == 0 {800 continue801 }802 }803 break804 }805 }806 } else if path[i] == end {807 if i+1 < len(path) && path[i+1] == '#' {808 r.query.all = true809 }810 break811 }812 }813 if i > len(path) {814 i = len(path)815 }816 v := path[s:i]817 for len(v) > 0 && v[len(v)-1] <= ' ' {818 v = v[:len(v)-1]819 }820 r.query.value = v821 }822 }823 }824 }825 continue826 }827 }828 r.part = path829 r.path = ""830 return831}832// splitQuery takes a query and splits it into three parts:833// path, op, middle, and right.834// So for this query:835// #(first_name=="Murphy").last836// Becomes837// first_name # path838// =="Murphy" # middle839// .last # right840// Or,841// #(service_roles.#(=="one")).cap842// Becomes843// service_roles.#(=="one") # path844// # middle845// .cap # right846func parseQuery(query string) (847 path, op, value, remain string, i int, ok bool,848) {849 if len(query) < 2 || query[0] != '#' ||850 (query[1] != '(' && query[1] != '[') {851 return "", "", "", "", i, false852 }853 i = 2854 j := 0 // start of value part855 depth := 1856 for ; i < len(query); i++ {857 if depth == 1 && j == 0 {858 switch query[i] {859 case '!', '=', '<', '>', '%':860 // start of the value part861 j = i862 continue863 }864 }865 if query[i] == '\\' {866 i++867 } else if query[i] == '[' || query[i] == '(' {868 depth++869 } else if query[i] == ']' || query[i] == ')' {870 depth--871 if depth == 0 {872 break873 }874 } else if query[i] == '"' {875 // inside selector string, balance quotes876 i++877 for ; i < len(query); i++ {878 if query[i] == '\\' {879 i++880 } else if query[i] == '"' {881 break882 }883 }884 }885 }886 if depth > 0 {887 return "", "", "", "", i, false888 }889 if j > 0 {890 path = trim(query[2:j])891 value = trim(query[j:i])892 remain = query[i+1:]893 // parse the compare op from the value894 var opsz int895 switch {896 case len(value) == 1:897 opsz = 1898 case value[0] == '!' && value[1] == '=':899 opsz = 2900 case value[0] == '!' && value[1] == '%':901 opsz = 2902 case value[0] == '<' && value[1] == '=':903 opsz = 2904 case value[0] == '>' && value[1] == '=':905 opsz = 2906 case value[0] == '=' && value[1] == '=':907 value = value[1:]908 opsz = 1909 case value[0] == '<':910 opsz = 1911 case value[0] == '>':912 opsz = 1913 case value[0] == '=':914 opsz = 1915 case value[0] == '%':916 opsz = 1917 }918 op = value[:opsz]919 value = trim(value[opsz:])920 } else {921 path = trim(query[2:i])922 remain = query[i+1:]923 }924 return path, op, value, remain, i + 1, true925}926func trim(s string) string {927left:928 if len(s) > 0 && s[0] <= ' ' {929 s = s[1:]930 goto left931 }932right:933 if len(s) > 0 && s[len(s)-1] <= ' ' {934 s = s[:len(s)-1]935 goto right936 }937 return s938}939type objectPathResult struct {940 part string941 path string942 pipe string943 piped bool944 wild bool945 more bool946}947func parseObjectPath(path string) (r objectPathResult) {948 for i := 0; i < len(path); i++ {949 if path[i] == '|' {950 r.part = path[:i]951 r.pipe = path[i+1:]952 r.piped = true953 return954 }955 if path[i] == '.' {956 // peek at the next byte and see if it's a '@', '[', or '{'.957 r.part = path[:i]958 if !DisableModifiers &&959 i < len(path)-1 &&960 (path[i+1] == '@' ||961 path[i+1] == '[' || path[i+1] == '{') {962 r.pipe = path[i+1:]963 r.piped = true964 } else {965 r.path = path[i+1:]966 r.more = true967 }968 return969 }970 if path[i] == '*' || path[i] == '?' {971 r.wild = true972 continue973 }974 if path[i] == '\\' {975 // go into escape mode. this is a slower path that976 // strips off the escape character from the part.977 epart := []byte(path[:i])978 i++979 if i < len(path) {980 epart = append(epart, path[i])981 i++982 for ; i < len(path); i++ {983 if path[i] == '\\' {984 i++985 if i < len(path) {986 epart = append(epart, path[i])987 }988 continue989 } else if path[i] == '.' {990 r.part = string(epart)991 // peek at the next byte and see if it's a '@' modifier992 if !DisableModifiers &&993 i < len(path)-1 && path[i+1] == '@' {994 r.pipe = path[i+1:]995 r.piped = true996 } else {997 r.path = path[i+1:]998 r.more = true999 }1000 r.more = true1001 return1002 } else if path[i] == '|' {1003 r.part = string(epart)1004 r.pipe = path[i+1:]1005 r.piped = true1006 return1007 } else if path[i] == '*' || path[i] == '?' {1008 r.wild = true1009 }1010 epart = append(epart, path[i])1011 }1012 }1013 // append the last part1014 r.part = string(epart)1015 return1016 }1017 }1018 r.part = path1019 return1020}1021func parseSquash(json string, i int) (int, string) {1022 // expects that the lead character is a '[' or '{' or '('1023 // squash the value, ignoring all nested arrays and objects.1024 // the first '[' or '{' or '(' has already been read1025 s := i1026 i++1027 depth := 11028 for ; i < len(json); i++ {1029 if json[i] >= '"' && json[i] <= '}' {1030 switch json[i] {1031 case '"':1032 i++1033 s2 := i1034 for ; i < len(json); i++ {1035 if json[i] > '\\' {1036 continue1037 }1038 if json[i] == '"' {1039 // look for an escaped slash1040 if json[i-1] == '\\' {1041 n := 01042 for j := i - 2; j > s2-1; j-- {1043 if json[j] != '\\' {1044 break1045 }1046 n++1047 }1048 if n%2 == 0 {1049 continue1050 }1051 }1052 break1053 }1054 }1055 case '{', '[', '(':1056 depth++1057 case '}', ']', ')':1058 depth--1059 if depth == 0 {1060 i++1061 return i, json[s:i]1062 }1063 }1064 }1065 }1066 return i, json[s:]1067}1068func parseObject(c *parseContext, i int, path string) (int, bool) {1069 var pmatch, kesc, vesc, ok, hit bool1070 var key, val string1071 rp := parseObjectPath(path)1072 if !rp.more && rp.piped {1073 c.pipe = rp.pipe1074 c.piped = true1075 }1076 for i < len(c.json) {1077 for ; i < len(c.json); i++ {1078 if c.json[i] == '"' {1079 // parse_key_string1080 // this is slightly different from getting s string value1081 // because we don't need the outer quotes.1082 i++1083 var s = i1084 for ; i < len(c.json); i++ {1085 if c.json[i] > '\\' {1086 continue1087 }1088 if c.json[i] == '"' {1089 i, key, kesc, ok = i+1, c.json[s:i], false, true1090 goto parse_key_string_done1091 }1092 if c.json[i] == '\\' {1093 i++1094 for ; i < len(c.json); i++ {1095 if c.json[i] > '\\' {1096 continue1097 }1098 if c.json[i] == '"' {1099 // look for an escaped slash1100 if c.json[i-1] == '\\' {1101 n := 01102 for j := i - 2; j > 0; j-- {1103 if c.json[j] != '\\' {1104 break1105 }1106 n++1107 }1108 if n%2 == 0 {1109 continue1110 }1111 }1112 i, key, kesc, ok = i+1, c.json[s:i], true, true1113 goto parse_key_string_done1114 }1115 }1116 break1117 }1118 }1119 key, kesc, ok = c.json[s:], false, false1120 parse_key_string_done:1121 break1122 }1123 if c.json[i] == '}' {1124 return i + 1, false1125 }1126 }1127 if !ok {1128 return i, false1129 }1130 if rp.wild {1131 if kesc {1132 pmatch = match.Match(unescape(key), rp.part)1133 } else {1134 pmatch = match.Match(key, rp.part)1135 }1136 } else {1137 if kesc {1138 pmatch = rp.part == unescape(key)1139 } else {1140 pmatch = rp.part == key1141 }1142 }1143 hit = pmatch && !rp.more1144 for ; i < len(c.json); i++ {1145 switch c.json[i] {1146 default:1147 continue1148 case '"':1149 i++1150 i, val, vesc, ok = parseString(c.json, i)1151 if !ok {1152 return i, false1153 }1154 if hit {1155 if vesc {1156 c.value.Str = unescape(val[1 : len(val)-1])1157 } else {1158 c.value.Str = val[1 : len(val)-1]1159 }1160 c.value.Raw = val1161 c.value.Type = String1162 return i, true1163 }1164 case '{':1165 if pmatch && !hit {1166 i, hit = parseObject(c, i+1, rp.path)1167 if hit {1168 return i, true1169 }1170 } else {1171 i, val = parseSquash(c.json, i)1172 if hit {1173 c.value.Raw = val1174 c.value.Type = JSON1175 return i, true1176 }1177 }1178 case '[':1179 if pmatch && !hit {1180 i, hit = parseArray(c, i+1, rp.path)1181 if hit {1182 return i, true1183 }1184 } else {1185 i, val = parseSquash(c.json, i)1186 if hit {1187 c.value.Raw = val1188 c.value.Type = JSON1189 return i, true1190 }1191 }1192 case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':1193 i, val = parseNumber(c.json, i)1194 if hit {1195 c.value.Raw = val1196 c.value.Type = Number1197 c.value.Num, _ = strconv.ParseFloat(val, 64)1198 return i, true1199 }1200 case 't', 'f', 'n':1201 vc := c.json[i]1202 i, val = parseLiteral(c.json, i)1203 if hit {1204 c.value.Raw = val1205 switch vc {1206 case 't':1207 c.value.Type = True1208 case 'f':1209 c.value.Type = False1210 }1211 return i, true1212 }1213 }1214 break1215 }1216 }1217 return i, false1218}1219func queryMatches(rp *arrayPathResult, value Result) bool {1220 rpv := rp.query.value1221 if len(rpv) > 2 && rpv[0] == '"' && rpv[len(rpv)-1] == '"' {1222 rpv = rpv[1 : len(rpv)-1]1223 }1224 if !value.Exists() {1225 return false1226 }1227 if rp.query.op == "" {1228 // the query is only looking for existence, such as:1229 // friends.#(name)1230 // which makes sure that the array "friends" has an element of1231 // "name" that exists1232 return true1233 }1234 switch value.Type {1235 case String:1236 switch rp.query.op {1237 case "=":1238 return value.Str == rpv1239 case "!=":1240 return value.Str != rpv1241 case "<":1242 return value.Str < rpv1243 case "<=":1244 return value.Str <= rpv1245 case ">":1246 return value.Str > rpv1247 case ">=":1248 return value.Str >= rpv1249 case "%":1250 return match.Match(value.Str, rpv)1251 case "!%":1252 return !match.Match(value.Str, rpv)1253 }1254 case Number:1255 rpvn, _ := strconv.ParseFloat(rpv, 64)1256 switch rp.query.op {1257 case "=":1258 return value.Num == rpvn1259 case "!=":1260 return value.Num != rpvn1261 case "<":1262 return value.Num < rpvn1263 case "<=":1264 return value.Num <= rpvn1265 case ">":1266 return value.Num > rpvn1267 case ">=":1268 return value.Num >= rpvn1269 }1270 case True:1271 switch rp.query.op {1272 case "=":1273 return rpv == "true"1274 case "!=":1275 return rpv != "true"1276 case ">":1277 return rpv == "false"1278 case ">=":1279 return true1280 }1281 case False:1282 switch rp.query.op {1283 case "=":1284 return rpv == "false"1285 case "!=":1286 return rpv != "false"1287 case "<":1288 return rpv == "true"1289 case "<=":1290 return true1291 }1292 }1293 return false1294}1295func parseArray(c *parseContext, i int, path string) (int, bool) {1296 var pmatch, vesc, ok, hit bool1297 var val string1298 var h int1299 var alog []int1300 var partidx int1301 var multires []byte1302 rp := parseArrayPath(path)1303 if !rp.arrch {1304 n, ok := parseUint(rp.part)1305 if !ok {1306 partidx = -11307 } else {1308 partidx = int(n)1309 }1310 }1311 if !rp.more && rp.piped {1312 c.pipe = rp.pipe1313 c.piped = true1314 }1315 procQuery := func(qval Result) bool {1316 if rp.query.all {1317 if len(multires) == 0 {1318 multires = append(multires, '[')1319 }1320 }1321 var res Result1322 if qval.Type == JSON {1323 res = qval.Get(rp.query.path)1324 } else {1325 if rp.query.path != "" {1326 return false1327 }1328 res = qval1329 }1330 if queryMatches(&rp, res) {1331 if rp.more {1332 left, right, ok := splitPossiblePipe(rp.path)1333 if ok {1334 rp.path = left1335 c.pipe = right1336 c.piped = true1337 }1338 res = qval.Get(rp.path)1339 } else {1340 res = qval1341 }1342 if rp.query.all {1343 raw := res.Raw1344 if len(raw) == 0 {1345 raw = res.String()1346 }1347 if raw != "" {1348 if len(multires) > 1 {1349 multires = append(multires, ',')1350 }1351 multires = append(multires, raw...)1352 }1353 } else {1354 c.value = res1355 return true1356 }1357 }1358 return false1359 }1360 for i < len(c.json)+1 {1361 if !rp.arrch {1362 pmatch = partidx == h1363 hit = pmatch && !rp.more1364 }1365 h++1366 if rp.alogok {1367 alog = append(alog, i)1368 }1369 for ; ; i++ {1370 var ch byte1371 if i > len(c.json) {1372 break1373 } else if i == len(c.json) {1374 ch = ']'1375 } else {1376 ch = c.json[i]1377 }1378 switch ch {1379 default:1380 continue1381 case '"':1382 i++1383 i, val, vesc, ok = parseString(c.json, i)1384 if !ok {1385 return i, false1386 }1387 if rp.query.on {1388 var qval Result1389 if vesc {1390 qval.Str = unescape(val[1 : len(val)-1])1391 } else {1392 qval.Str = val[1 : len(val)-1]1393 }1394 qval.Raw = val1395 qval.Type = String1396 if procQuery(qval) {1397 return i, true1398 }1399 } else if hit {1400 if rp.alogok {1401 break1402 }1403 if vesc {1404 c.value.Str = unescape(val[1 : len(val)-1])1405 } else {1406 c.value.Str = val[1 : len(val)-1]1407 }1408 c.value.Raw = val1409 c.value.Type = String1410 return i, true1411 }1412 case '{':1413 if pmatch && !hit {1414 i, hit = parseObject(c, i+1, rp.path)1415 if hit {1416 if rp.alogok {1417 break1418 }1419 return i, true1420 }1421 } else {1422 i, val = parseSquash(c.json, i)1423 if rp.query.on {1424 if procQuery(Result{Raw: val, Type: JSON}) {1425 return i, true1426 }1427 } else if hit {1428 if rp.alogok {1429 break1430 }1431 c.value.Raw = val1432 c.value.Type = JSON1433 return i, true1434 }1435 }1436 case '[':1437 if pmatch && !hit {1438 i, hit = parseArray(c, i+1, rp.path)1439 if hit {1440 if rp.alogok {1441 break1442 }1443 return i, true1444 }1445 } else {1446 i, val = parseSquash(c.json, i)1447 if rp.query.on {1448 if procQuery(Result{Raw: val, Type: JSON}) {1449 return i, true1450 }1451 } else if hit {1452 if rp.alogok {1453 break1454 }1455 c.value.Raw = val1456 c.value.Type = JSON1457 return i, true1458 }1459 }1460 case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':1461 i, val = parseNumber(c.json, i)1462 if rp.query.on {1463 var qval Result1464 qval.Raw = val1465 qval.Type = Number1466 qval.Num, _ = strconv.ParseFloat(val, 64)1467 if procQuery(qval) {1468 return i, true1469 }1470 } else if hit {1471 if rp.alogok {1472 break1473 }1474 c.value.Raw = val1475 c.value.Type = Number1476 c.value.Num, _ = strconv.ParseFloat(val, 64)1477 return i, true1478 }1479 case 't', 'f', 'n':1480 vc := c.json[i]1481 i, val = parseLiteral(c.json, i)1482 if rp.query.on {1483 var qval Result1484 qval.Raw = val1485 switch vc {1486 case 't':1487 qval.Type = True1488 case 'f':1489 qval.Type = False1490 }1491 if procQuery(qval) {1492 return i, true1493 }1494 } else if hit {1495 if rp.alogok {1496 break1497 }1498 c.value.Raw = val1499 switch vc {1500 case 't':1501 c.value.Type = True1502 case 'f':1503 c.value.Type = False1504 }1505 return i, true1506 }1507 case ']':1508 if rp.arrch && rp.part == "#" {1509 if rp.alogok {1510 left, right, ok := splitPossiblePipe(rp.alogkey)1511 if ok {1512 rp.alogkey = left1513 c.pipe = right1514 c.piped = true1515 }1516 var jsons = make([]byte, 0, 64)1517 jsons = append(jsons, '[')1518 for j, k := 0, 0; j < len(alog); j++ {1519 idx := alog[j]1520 for idx < len(c.json) {1521 switch c.json[idx] {1522 case ' ', '\t', '\r', '\n':1523 idx++1524 continue1525 }1526 break1527 }1528 if idx < len(c.json) && c.json[idx] != ']' {1529 _, res, ok := parseAny(c.json, idx, true)1530 if ok {1531 res := res.Get(rp.alogkey)1532 if res.Exists() {1533 if k > 0 {1534 jsons = append(jsons, ',')1535 }1536 raw := res.Raw1537 if len(raw) == 0 {1538 raw = res.String()1539 }1540 jsons = append(jsons, []byte(raw)...)1541 k++1542 }1543 }1544 }1545 }1546 jsons = append(jsons, ']')1547 c.value.Type = JSON1548 c.value.Raw = string(jsons)1549 return i + 1, true1550 }1551 if rp.alogok {1552 break1553 }1554 c.value.Type = Number1555 c.value.Num = float64(h - 1)1556 c.value.Raw = strconv.Itoa(h - 1)1557 c.calcd = true1558 return i + 1, true1559 }1560 if len(multires) > 0 && !c.value.Exists() {1561 c.value = Result{1562 Raw: string(append(multires, ']')),1563 Type: JSON,1564 }1565 }1566 return i + 1, false1567 }1568 break1569 }1570 }1571 return i, false1572}1573func splitPossiblePipe(path string) (left, right string, ok bool) {1574 // take a quick peek for the pipe character. If found we'll split the piped1575 // part of the path into the c.pipe field and shorten the rp.1576 var possible bool1577 for i := 0; i < len(path); i++ {1578 if path[i] == '|' {1579 possible = true1580 break1581 }1582 }1583 if !possible {1584 return1585 }1586 if len(path) > 0 && path[0] == '{' {1587 squashed := squash(path[1:])1588 if len(squashed) < len(path)-1 {1589 squashed = path[:len(squashed)+1]1590 remain := path[len(squashed):]1591 if remain[0] == '|' {1592 return squashed, remain[1:], true1593 }1594 }1595 return1596 }1597 // split the left and right side of the path with the pipe character as1598 // the delimiter. This is a little tricky because we'll need to basically1599 // parse the entire path.1600 for i := 0; i < len(path); i++ {1601 if path[i] == '\\' {1602 i++1603 } else if path[i] == '.' {1604 if i == len(path)-1 {1605 return1606 }1607 if path[i+1] == '#' {1608 i += 21609 if i == len(path) {1610 return1611 }1612 if path[i] == '[' || path[i] == '(' {1613 var start, end byte1614 if path[i] == '[' {1615 start, end = '[', ']'1616 } else {1617 start, end = '(', ')'1618 }1619 // inside selector, balance brackets1620 i++1621 depth := 11622 for ; i < len(path); i++ {1623 if path[i] == '\\' {1624 i++1625 } else if path[i] == start {1626 depth++1627 } else if path[i] == end {1628 depth--1629 if depth == 0 {1630 break1631 }1632 } else if path[i] == '"' {1633 // inside selector string, balance quotes1634 i++1635 for ; i < len(path); i++ {1636 if path[i] == '\\' {1637 i++1638 } else if path[i] == '"' {1639 break1640 }1641 }1642 }1643 }1644 }1645 }1646 } else if path[i] == '|' {1647 return path[:i], path[i+1:], true1648 }1649 }1650 return1651}1652// ForEachLine iterates through lines of JSON as specified by the JSON Lines1653// format (http://jsonlines.org/).1654// Each line is returned as a GJSON Result.1655func ForEachLine(json string, iterator func(line Result) bool) {1656 var res Result1657 var i int1658 for {1659 i, res, _ = parseAny(json, i, true)1660 if !res.Exists() {1661 break1662 }1663 if !iterator(res) {1664 return1665 }1666 }1667}1668type subSelector struct {1669 name string1670 path string1671}1672// parseSubSelectors returns the subselectors belonging to a '[path1,path2]' or1673// '{"field1":path1,"field2":path2}' type subSelection. It's expected that the1674// first character in path is either '[' or '{', and has already been checked1675// prior to calling this function.1676func parseSubSelectors(path string) (sels []subSelector, out string, ok bool) {1677 modifer := 01678 depth := 11679 colon := 01680 start := 11681 i := 11682 pushSel := func() {1683 var sel subSelector1684 if colon == 0 {1685 sel.path = path[start:i]1686 } else {1687 sel.name = path[start:colon]1688 sel.path = path[colon+1 : i]1689 }1690 sels = append(sels, sel)1691 colon = 01692 start = i + 11693 }1694 for ; i < len(path); i++ {1695 switch path[i] {1696 case '\\':1697 i++1698 case '@':1699 if modifer == 0 && i > 0 && (path[i-1] == '.' || path[i-1] == '|') {1700 modifer = i1701 }1702 case ':':1703 if modifer == 0 && colon == 0 && depth == 1 {1704 colon = i1705 }1706 case ',':1707 if depth == 1 {1708 pushSel()1709 }1710 case '"':1711 i++1712 loop:1713 for ; i < len(path); i++ {1714 switch path[i] {1715 case '\\':1716 i++1717 case '"':1718 break loop1719 }1720 }1721 case '[', '(', '{':1722 depth++1723 case ']', ')', '}':1724 depth--1725 if depth == 0 {1726 pushSel()1727 path = path[i+1:]1728 return sels, path, true1729 }1730 }1731 }1732 return1733}1734// nameOfLast returns the name of the last component1735func nameOfLast(path string) string {1736 for i := len(path) - 1; i >= 0; i-- {1737 if path[i] == '|' || path[i] == '.' {1738 if i > 0 {1739 if path[i-1] == '\\' {1740 continue1741 }1742 }1743 return path[i+1:]1744 }1745 }1746 return path1747}1748func isSimpleName(component string) bool {1749 for i := 0; i < len(component); i++ {1750 if component[i] < ' ' {1751 return false1752 }1753 switch component[i] {1754 case '[', ']', '{', '}', '(', ')', '#', '|':1755 return false1756 }1757 }1758 return true1759}1760func appendJSONString(dst []byte, s string) []byte {1761 for i := 0; i < len(s); i++ {1762 if s[i] < ' ' || s[i] == '\\' || s[i] == '"' || s[i] > 126 {1763 d, _ := json.Marshal(s)1764 return append(dst, string(d)...)1765 }1766 }1767 dst = append(dst, '"')1768 dst = append(dst, s...)1769 dst = append(dst, '"')1770 return dst1771}1772type parseContext struct {1773 json string1774 value Result1775 pipe string1776 piped bool1777 calcd bool1778 lines bool1779}1780// Get searches json for the specified path.1781// A path is in dot syntax, such as "name.last" or "age".1782// When the value is found it's returned immediately.1783//1784// A path is a series of keys searated by a dot.1785// A key may contain special wildcard characters '*' and '?'.1786// To access an array value use the index as the key.1787// To get the number of elements in an array or to access a child path, use1788// the '#' character.1789// The dot and wildcard character can be escaped with '\'.1790//1791// {1792// "name": {"first": "Tom", "last": "Anderson"},1793// "age":37,1794// "children": ["Sara","Alex","Jack"],1795// "friends": [1796// {"first": "James", "last": "Murphy"},1797// {"first": "Roger", "last": "Craig"}1798// ]1799// }1800// "name.last" >> "Anderson"1801// "age" >> 371802// "children" >> ["Sara","Alex","Jack"]1803// "children.#" >> 31804// "children.1" >> "Alex"1805// "child*.2" >> "Jack"1806// "c?ildren.0" >> "Sara"1807// "friends.#.first" >> ["James","Roger"]1808//1809// This function expects that the json is well-formed, and does not validate.1810// Invalid json will not panic, but it may return back unexpected results.1811// If you are consuming JSON from an unpredictable source then you may want to1812// use the Valid function first.1813func Get(json, path string) Result {1814 if len(path) > 1 {1815 if !DisableModifiers {1816 if path[0] == '@' {1817 // possible modifier1818 var ok bool1819 var npath string1820 var rjson string1821 npath, rjson, ok = execModifier(json, path)1822 if ok {1823 path = npath1824 if len(path) > 0 && (path[0] == '|' || path[0] == '.') {1825 res := Get(rjson, path[1:])1826 res.Index = 01827 return res1828 }1829 return Parse(rjson)1830 }1831 }1832 }1833 if path[0] == '[' || path[0] == '{' {1834 // using a subselector path1835 kind := path[0]1836 var ok bool1837 var subs []subSelector1838 subs, path, ok = parseSubSelectors(path)1839 if ok {1840 if len(path) == 0 || (path[0] == '|' || path[0] == '.') {1841 var b []byte1842 b = append(b, kind)1843 var i int1844 for _, sub := range subs {1845 res := Get(json, sub.path)1846 if res.Exists() {1847 if i > 0 {1848 b = append(b, ',')1849 }1850 if kind == '{' {1851 if len(sub.name) > 0 {1852 if sub.name[0] == '"' && Valid(sub.name) {1853 b = append(b, sub.name...)1854 } else {1855 b = appendJSONString(b, sub.name)1856 }1857 } else {1858 last := nameOfLast(sub.path)1859 if isSimpleName(last) {1860 b = appendJSONString(b, last)1861 } else {1862 b = appendJSONString(b, "_")1863 }1864 }1865 b = append(b, ':')1866 }1867 var raw string1868 if len(res.Raw) == 0 {1869 raw = res.String()1870 if len(raw) == 0 {1871 raw = "null"1872 }1873 } else {1874 raw = res.Raw1875 }1876 b = append(b, raw...)1877 i++1878 }1879 }1880 b = append(b, kind+2)1881 var res Result1882 res.Raw = string(b)1883 res.Type = JSON1884 if len(path) > 0 {1885 res = res.Get(path[1:])1886 }1887 res.Index = 01888 return res1889 }1890 }1891 }1892 }1893 var i int1894 var c = &parseContext{json: json}1895 if len(path) >= 2 && path[0] == '.' && path[1] == '.' {1896 c.lines = true1897 parseArray(c, 0, path[2:])1898 } else {1899 for ; i < len(c.json); i++ {1900 if c.json[i] == '{' {1901 i++1902 parseObject(c, i, path)1903 break1904 }1905 if c.json[i] == '[' {1906 i++1907 parseArray(c, i, path)1908 break1909 }1910 }1911 }1912 if c.piped {1913 res := c.value.Get(c.pipe)1914 res.Index = 01915 return res1916 }1917 fillIndex(json, c)1918 return c.value1919}1920// GetBytes searches json for the specified path.1921// If working with bytes, this method preferred over Get(string(data), path)1922func GetBytes(json []byte, path string) Result {1923 return getBytes(json, path)1924}1925// runeit returns the rune from the the \uXXXX1926func runeit(json string) rune {1927 n, _ := strconv.ParseUint(json[:4], 16, 64)1928 return rune(n)1929}1930// unescape unescapes a string1931func unescape(json string) string {1932 var str = make([]byte, 0, len(json))1933 for i := 0; i < len(json); i++ {1934 switch {1935 default:1936 str = append(str, json[i])1937 case json[i] < ' ':1938 return string(str)1939 case json[i] == '\\':1940 i++1941 if i >= len(json) {1942 return string(str)1943 }1944 switch json[i] {1945 default:1946 return string(str)1947 case '\\':1948 str = append(str, '\\')1949 case '/':1950 str = append(str, '/')1951 case 'b':1952 str = append(str, '\b')1953 case 'f':1954 str = append(str, '\f')1955 case 'n':1956 str = append(str, '\n')1957 case 'r':1958 str = append(str, '\r')1959 case 't':1960 str = append(str, '\t')1961 case '"':1962 str = append(str, '"')1963 case 'u':1964 if i+5 > len(json) {1965 return string(str)1966 }1967 r := runeit(json[i+1:])1968 i += 51969 if utf16.IsSurrogate(r) {1970 // need another code1971 if len(json[i:]) >= 6 && json[i] == '\\' &&1972 json[i+1] == 'u' {1973 // we expect it to be correct so just consume it1974 r = utf16.DecodeRune(r, runeit(json[i+2:]))1975 i += 61976 }1977 }1978 // provide enough space to encode the largest utf8 possible1979 str = append(str, 0, 0, 0, 0, 0, 0, 0, 0)1980 n := utf8.EncodeRune(str[len(str)-8:], r)1981 str = str[:len(str)-8+n]1982 i-- // backtrack index by one1983 }1984 }1985 }1986 return string(str)1987}1988// Less return true if a token is less than another token.1989// The caseSensitive paramater is used when the tokens are Strings.1990// The order when comparing two different type is:1991//1992// Null < False < Number < String < True < JSON1993//1994func (t Result) Less(token Result, caseSensitive bool) bool {1995 if t.Type < token.Type {1996 return true1997 }1998 if t.Type > token.Type {1999 return false2000 }2001 if t.Type == String {2002 if caseSensitive {2003 return t.Str < token.Str2004 }2005 return stringLessInsensitive(t.Str, token.Str)2006 }2007 if t.Type == Number {2008 return t.Num < token.Num2009 }2010 return t.Raw < token.Raw2011}2012func stringLessInsensitive(a, b string) bool {2013 for i := 0; i < len(a) && i < len(b); i++ {2014 if a[i] >= 'A' && a[i] <= 'Z' {2015 if b[i] >= 'A' && b[i] <= 'Z' {2016 // both are uppercase, do nothing2017 if a[i] < b[i] {2018 return true2019 } else if a[i] > b[i] {2020 return false2021 }2022 } else {2023 // a is uppercase, convert a to lowercase2024 if a[i]+32 < b[i] {2025 return true2026 } else if a[i]+32 > b[i] {2027 return false2028 }2029 }2030 } else if b[i] >= 'A' && b[i] <= 'Z' {2031 // b is uppercase, convert b to lowercase2032 if a[i] < b[i]+32 {2033 return true2034 } else if a[i] > b[i]+32 {2035 return false2036 }2037 } else {2038 // neither are uppercase2039 if a[i] < b[i] {2040 return true2041 } else if a[i] > b[i] {2042 return false2043 }2044 }2045 }2046 return len(a) < len(b)2047}2048// parseAny parses the next value from a json string.2049// A Result is returned when the hit param is set.2050// The return values are (i int, res Result, ok bool)2051func parseAny(json string, i int, hit bool) (int, Result, bool) {2052 var res Result2053 var val string2054 for ; i < len(json); i++ {2055 if json[i] == '{' || json[i] == '[' {2056 i, val = parseSquash(json, i)2057 if hit {2058 res.Raw = val2059 res.Type = JSON2060 }2061 return i, res, true2062 }2063 if json[i] <= ' ' {2064 continue2065 }2066 switch json[i] {2067 case '"':2068 i++2069 var vesc bool2070 var ok bool2071 i, val, vesc, ok = parseString(json, i)2072 if !ok {2073 return i, res, false2074 }2075 if hit {2076 res.Type = String2077 res.Raw = val2078 if vesc {2079 res.Str = unescape(val[1 : len(val)-1])2080 } else {2081 res.Str = val[1 : len(val)-1]2082 }2083 }2084 return i, res, true2085 case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':2086 i, val = parseNumber(json, i)2087 if hit {2088 res.Raw = val2089 res.Type = Number2090 res.Num, _ = strconv.ParseFloat(val, 64)2091 }2092 return i, res, true2093 case 't', 'f', 'n':2094 vc := json[i]2095 i, val = parseLiteral(json, i)2096 if hit {2097 res.Raw = val2098 switch vc {2099 case 't':2100 res.Type = True2101 case 'f':2102 res.Type = False2103 }2104 return i, res, true2105 }2106 }2107 }2108 return i, res, false2109}2110var ( // used for testing2111 testWatchForFallback bool2112 testLastWasFallback bool2113)2114// GetMany searches json for the multiple paths.2115// The return value is a Result array where the number of items2116// will be equal to the number of input paths.2117func GetMany(json string, path ...string) []Result {2118 res := make([]Result, len(path))2119 for i, path := range path {2120 res[i] = Get(json, path)2121 }2122 return res2123}2124// GetManyBytes searches json for the multiple paths.2125// The return value is a Result array where the number of items2126// will be equal to the number of input paths.2127func GetManyBytes(json []byte, path ...string) []Result {2128 res := make([]Result, len(path))2129 for i, path := range path {2130 res[i] = GetBytes(json, path)2131 }2132 return res2133}2134func validpayload(data []byte, i int) (outi int, ok bool) {2135 for ; i < len(data); i++ {2136 switch data[i] {2137 default:2138 i, ok = validany(data, i)2139 if !ok {2140 return i, false2141 }2142 for ; i < len(data); i++ {2143 switch data[i] {2144 default:2145 return i, false2146 case ' ', '\t', '\n', '\r':2147 continue2148 }2149 }2150 return i, true2151 case ' ', '\t', '\n', '\r':2152 continue2153 }2154 }2155 return i, false2156}2157func validany(data []byte, i int) (outi int, ok bool) {2158 for ; i < len(data); i++ {2159 switch data[i] {2160 default:2161 return i, false2162 case ' ', '\t', '\n', '\r':2163 continue2164 case '{':2165 return validobject(data, i+1)2166 case '[':2167 return validarray(data, i+1)2168 case '"':2169 return validstring(data, i+1)2170 case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':2171 return validnumber(data, i+1)2172 case 't':2173 return validtrue(data, i+1)2174 case 'f':2175 return validfalse(data, i+1)2176 case 'n':2177 return validnull(data, i+1)2178 }2179 }2180 return i, false2181}2182func validobject(data []byte, i int) (outi int, ok bool) {2183 for ; i < len(data); i++ {2184 switch data[i] {2185 default:2186 return i, false2187 case ' ', '\t', '\n', '\r':2188 continue2189 case '}':2190 return i + 1, true2191 case '"':2192 key:2193 if i, ok = validstring(data, i+1); !ok {2194 return i, false2195 }2196 if i, ok = validcolon(data, i); !ok {2197 return i, false2198 }2199 if i, ok = validany(data, i); !ok {2200 return i, false2201 }2202 if i, ok = validcomma(data, i, '}'); !ok {2203 return i, false2204 }2205 if data[i] == '}' {2206 return i + 1, true2207 }2208 i++2209 for ; i < len(data); i++ {2210 switch data[i] {2211 default:2212 return i, false2213 case ' ', '\t', '\n', '\r':2214 continue2215 case '"':2216 goto key2217 }2218 }2219 return i, false2220 }2221 }2222 return i, false2223}2224func validcolon(data []byte, i int) (outi int, ok bool) {2225 for ; i < len(data); i++ {2226 switch data[i] {2227 default:2228 return i, false2229 case ' ', '\t', '\n', '\r':2230 continue2231 case ':':2232 return i + 1, true2233 }2234 }2235 return i, false2236}2237func validcomma(data []byte, i int, end byte) (outi int, ok bool) {2238 for ; i < len(data); i++ {2239 switch data[i] {2240 default:2241 return i, false2242 case ' ', '\t', '\n', '\r':2243 continue2244 case ',':2245 return i, true2246 case end:2247 return i, true2248 }2249 }2250 return i, false2251}2252func validarray(data []byte, i int) (outi int, ok bool) {2253 for ; i < len(data); i++ {2254 switch data[i] {2255 default:2256 for ; i < len(data); i++ {2257 if i, ok = validany(data, i); !ok {2258 return i, false2259 }2260 if i, ok = validcomma(data, i, ']'); !ok {2261 return i, false2262 }2263 if data[i] == ']' {2264 return i + 1, true2265 }2266 }2267 case ' ', '\t', '\n', '\r':2268 continue2269 case ']':2270 return i + 1, true2271 }2272 }2273 return i, false2274}2275func validstring(data []byte, i int) (outi int, ok bool) {2276 for ; i < len(data); i++ {2277 if data[i] < ' ' {2278 return i, false2279 } else if data[i] == '\\' {2280 i++2281 if i == len(data) {2282 return i, false2283 }2284 switch data[i] {2285 default:2286 return i, false2287 case '"', '\\', '/', 'b', 'f', 'n', 'r', 't':2288 case 'u':2289 for j := 0; j < 4; j++ {2290 i++2291 if i >= len(data) {2292 return i, false2293 }2294 if !((data[i] >= '0' && data[i] <= '9') ||2295 (data[i] >= 'a' && data[i] <= 'f') ||2296 (data[i] >= 'A' && data[i] <= 'F')) {2297 return i, false2298 }2299 }2300 }2301 } else if data[i] == '"' {2302 return i + 1, true2303 }2304 }2305 return i, false2306}2307func validnumber(data []byte, i int) (outi int, ok bool) {2308 i--2309 // sign2310 if data[i] == '-' {2311 i++2312 }2313 // int2314 if i == len(data) {2315 return i, false2316 }2317 if data[i] == '0' {2318 i++2319 } else {2320 for ; i < len(data); i++ {2321 if data[i] >= '0' && data[i] <= '9' {2322 continue2323 }2324 break2325 }2326 }2327 // frac2328 if i == len(data) {2329 return i, true2330 }2331 if data[i] == '.' {2332 i++2333 if i == len(data) {2334 return i, false2335 }2336 if data[i] < '0' || data[i] > '9' {2337 return i, false2338 }2339 i++2340 for ; i < len(data); i++ {2341 if data[i] >= '0' && data[i] <= '9' {2342 continue2343 }2344 break2345 }2346 }2347 // exp2348 if i == len(data) {2349 return i, true2350 }2351 if data[i] == 'e' || data[i] == 'E' {2352 i++2353 if i == len(data) {2354 return i, false2355 }2356 if data[i] == '+' || data[i] == '-' {2357 i++2358 }2359 if i == len(data) {2360 return i, false2361 }2362 if data[i] < '0' || data[i] > '9' {2363 return i, false2364 }2365 i++2366 for ; i < len(data); i++ {2367 if data[i] >= '0' && data[i] <= '9' {2368 continue2369 }2370 break2371 }2372 }2373 return i, true2374}2375func validtrue(data []byte, i int) (outi int, ok bool) {2376 if i+3 <= len(data) && data[i] == 'r' && data[i+1] == 'u' &&2377 data[i+2] == 'e' {2378 return i + 3, true2379 }2380 return i, false2381}2382func validfalse(data []byte, i int) (outi int, ok bool) {2383 if i+4 <= len(data) && data[i] == 'a' && data[i+1] == 'l' &&2384 data[i+2] == 's' && data[i+3] == 'e' {2385 return i + 4, true2386 }2387 return i, false2388}2389func validnull(data []byte, i int) (outi int, ok bool) {2390 if i+3 <= len(data) && data[i] == 'u' && data[i+1] == 'l' &&2391 data[i+2] == 'l' {2392 return i + 3, true2393 }2394 return i, false2395}2396// Valid returns true if the input is valid json.2397//2398// if !gjson.Valid(json) {2399// return errors.New("invalid json")2400// }2401// value := gjson.Get(json, "name.last")2402//2403func Valid(json string) bool {2404 _, ok := validpayload(stringBytes(json), 0)2405 return ok2406}2407// ValidBytes returns true if the input is valid json.2408//2409// if !gjson.Valid(json) {2410// return errors.New("invalid json")2411// }2412// value := gjson.Get(json, "name.last")2413//2414// If working with bytes, this method preferred over ValidBytes(string(data))2415//2416func ValidBytes(json []byte) bool {2417 _, ok := validpayload(json, 0)2418 return ok2419}2420func parseUint(s string) (n uint64, ok bool) {2421 var i int2422 if i == len(s) {2423 return 0, false2424 }2425 for ; i < len(s); i++ {2426 if s[i] >= '0' && s[i] <= '9' {2427 n = n*10 + uint64(s[i]-'0')2428 } else {2429 return 0, false2430 }2431 }2432 return n, true2433}2434func parseInt(s string) (n int64, ok bool) {2435 var i int2436 var sign bool2437 if len(s) > 0 && s[0] == '-' {2438 sign = true2439 i++2440 }2441 if i == len(s) {2442 return 0, false2443 }2444 for ; i < len(s); i++ {2445 if s[i] >= '0' && s[i] <= '9' {2446 n = n*10 + int64(s[i]-'0')2447 } else {2448 return 0, false2449 }2450 }2451 if sign {2452 return n * -1, true2453 }2454 return n, true2455}2456const minUint53 = 02457const maxUint53 = 45035996273704952458const minInt53 = -22517998136852482459const maxInt53 = 22517998136852472460func floatToUint(f float64) (n uint64, ok bool) {2461 n = uint64(f)2462 if float64(n) == f && n >= minUint53 && n <= maxUint53 {2463 return n, true2464 }2465 return 0, false2466}2467func floatToInt(f float64) (n int64, ok bool) {2468 n = int64(f)2469 if float64(n) == f && n >= minInt53 && n <= maxInt53 {2470 return n, true2471 }2472 return 0, false2473}2474// execModifier parses the path to find a matching modifier function.2475// then input expects that the path already starts with a '@'2476func execModifier(json, path string) (pathOut, res string, ok bool) {2477 name := path[1:]2478 var hasArgs bool2479 for i := 1; i < len(path); i++ {2480 if path[i] == ':' {2481 pathOut = path[i+1:]2482 name = path[1:i]2483 hasArgs = len(pathOut) > 02484 break2485 }2486 if path[i] == '|' {2487 pathOut = path[i:]2488 name = path[1:i]2489 break2490 }2491 if path[i] == '.' {2492 pathOut = path[i:]2493 name = path[1:i]2494 break2495 }2496 }2497 if fn, ok := modifiers[name]; ok {2498 var args string2499 if hasArgs {2500 var parsedArgs bool2501 switch pathOut[0] {2502 case '{', '[', '"':2503 res := Parse(pathOut)2504 if res.Exists() {2505 args = squash(pathOut)2506 pathOut = pathOut[len(args):]2507 parsedArgs = true2508 }2509 }2510 if !parsedArgs {2511 idx := strings.IndexByte(pathOut, '|')2512 if idx == -1 {2513 args = pathOut2514 pathOut = ""2515 } else {2516 args = pathOut[:idx]2517 pathOut = pathOut[idx:]2518 }2519 }2520 }2521 return pathOut, fn(json, args), true2522 }2523 return pathOut, res, false2524}2525// unwrap removes the '[]' or '{}' characters around json2526func unwrap(json string) string {2527 json = trim(json)2528 if len(json) >= 2 && json[0] == '[' || json[0] == '{' {2529 json = json[1 : len(json)-1]2530 }2531 return json2532}2533// DisableModifiers will disable the modifier syntax2534var DisableModifiers = false2535var modifiers = map[string]func(json, arg string) string{2536 "pretty": modPretty,2537 "ugly": modUgly,2538 "reverse": modReverse,2539 "this": modThis,2540 "flatten": modFlatten,2541 "join": modJoin,2542 "valid": modValid,2543}2544// AddModifier binds a custom modifier command to the GJSON syntax.2545// This operation is not thread safe and should be executed prior to2546// using all other gjson function.2547func AddModifier(name string, fn func(json, arg string) string) {2548 modifiers[name] = fn2549}2550// ModifierExists returns true when the specified modifier exists.2551func ModifierExists(name string, fn func(json, arg string) string) bool {2552 _, ok := modifiers[name]2553 return ok2554}2555// @pretty modifier makes the json look nice.2556func modPretty(json, arg string) string {2557 if len(arg) > 0 {2558 opts := *pretty.DefaultOptions2559 Parse(arg).ForEach(func(key, value Result) bool {2560 switch key.String() {2561 case "sortKeys":2562 opts.SortKeys = value.Bool()2563 case "indent":2564 opts.Indent = value.String()2565 case "prefix":2566 opts.Prefix = value.String()2567 case "width":2568 opts.Width = int(value.Int())2569 }2570 return true2571 })2572 return bytesString(pretty.PrettyOptions(stringBytes(json), &opts))2573 }2574 return bytesString(pretty.Pretty(stringBytes(json)))2575}2576// @this returns the current element. Can be used to retrieve the root element.2577func modThis(json, arg string) string {2578 return json2579}2580// @ugly modifier removes all whitespace.2581func modUgly(json, arg string) string {2582 return bytesString(pretty.Ugly(stringBytes(json)))2583}2584// @reverse reverses array elements or root object members.2585func modReverse(json, arg string) string {2586 res := Parse(json)2587 if res.IsArray() {2588 var values []Result2589 res.ForEach(func(_, value Result) bool {2590 values = append(values, value)2591 return true2592 })2593 out := make([]byte, 0, len(json))2594 out = append(out, '[')2595 for i, j := len(values)-1, 0; i >= 0; i, j = i-1, j+1 {2596 if j > 0 {2597 out = append(out, ',')2598 }2599 out = append(out, values[i].Raw...)2600 }2601 out = append(out, ']')2602 return bytesString(out)2603 }2604 if res.IsObject() {2605 var keyValues []Result2606 res.ForEach(func(key, value Result) bool {2607 keyValues = append(keyValues, key, value)2608 return true2609 })2610 out := make([]byte, 0, len(json))2611 out = append(out, '{')2612 for i, j := len(keyValues)-2, 0; i >= 0; i, j = i-2, j+1 {2613 if j > 0 {2614 out = append(out, ',')2615 }2616 out = append(out, keyValues[i+0].Raw...)2617 out = append(out, ':')2618 out = append(out, keyValues[i+1].Raw...)2619 }2620 out = append(out, '}')2621 return bytesString(out)2622 }2623 return json2624}2625// @flatten an array with child arrays.2626// [1,[2],[3,4],[5,[6,7]]] -> [1,2,3,4,5,[6,7]]2627// The {"deep":true} arg can be provide for deep flattening.2628// [1,[2],[3,4],[5,[6,7]]] -> [1,2,3,4,5,6,7]2629// The original json is returned when the json is not an array.2630func modFlatten(json, arg string) string {2631 res := Parse(json)2632 if !res.IsArray() {2633 return json2634 }2635 var deep bool2636 if arg != "" {2637 Parse(arg).ForEach(func(key, value Result) bool {2638 if key.String() == "deep" {2639 deep = value.Bool()2640 }2641 return true2642 })2643 }2644 var out []byte2645 out = append(out, '[')2646 var idx int2647 res.ForEach(func(_, value Result) bool {2648 if idx > 0 {2649 out = append(out, ',')2650 }2651 if value.IsArray() {2652 if deep {2653 out = append(out, unwrap(modFlatten(value.Raw, arg))...)2654 } else {2655 out = append(out, unwrap(value.Raw)...)2656 }2657 } else {2658 out = append(out, value.Raw...)2659 }2660 idx++2661 return true2662 })2663 out = append(out, ']')2664 return bytesString(out)2665}2666// @join multiple objects into a single object.2667// [{"first":"Tom"},{"last":"Smith"}] -> {"first","Tom","last":"Smith"}2668// The arg can be "true" to specify that duplicate keys should be preserved.2669// [{"first":"Tom","age":37},{"age":41}] -> {"first","Tom","age":37,"age":41}2670// Without preserved keys:2671// [{"first":"Tom","age":37},{"age":41}] -> {"first","Tom","age":41}2672// The original json is returned when the json is not an object.2673func modJoin(json, arg string) string {2674 res := Parse(json)2675 if !res.IsArray() {2676 return json2677 }2678 var preserve bool2679 if arg != "" {2680 Parse(arg).ForEach(func(key, value Result) bool {2681 if key.String() == "preserve" {2682 preserve = value.Bool()2683 }2684 return true2685 })2686 }2687 var out []byte2688 out = append(out, '{')2689 if preserve {2690 // Preserve duplicate keys.2691 var idx int2692 res.ForEach(func(_, value Result) bool {2693 if !value.IsObject() {2694 return true...

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parser.go

Source:parser.go Github

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1package antnet2import (3 "reflect"4)5type IMsgParser interface {6 C2S() interface{}7 S2C() interface{}8 C2SData() []byte9 S2CData() []byte10 C2SString() string11 S2CString() string12}13type MsgParser struct {14 s2c interface{}15 c2s interface{}16 c2sFunc ParseFunc17 s2cFunc ParseFunc18 parser IParser19}20func (r *MsgParser) C2S() interface{} {21 if r.c2s == nil && r.c2sFunc != nil {22 r.c2s = r.c2sFunc()23 }24 return r.c2s25}26func (r *MsgParser) S2C() interface{} {27 if r.s2c == nil && r.s2cFunc != nil {28 r.s2c = r.s2cFunc()29 }30 return r.s2c31}32func (r *MsgParser) C2SData() []byte {33 return r.parser.PackMsg(r.C2S())34}35func (r *MsgParser) S2CData() []byte {36 return r.parser.PackMsg(r.S2C())37}38func (r *MsgParser) C2SString() string {39 return string(r.C2SData())40}41func (r *MsgParser) S2CString() string {42 return string(r.S2CData())43}44type ParserType int45const (46 ParserTypePB ParserType = iota //protobuf类型,用于和客户端交互47 ParserTypeJson //json类型,可以用于客户端或者服务器之间交互48 ParserTypeCmd //cmd类型,类似telnet指令,用于直接和程序交互49 ParserTypeRaw //不做任何解析50)51type ParseErrType int52const (53 ParseErrTypeSendRemind ParseErrType = iota //消息解析失败发送提醒消息54 ParseErrTypeContinue //消息解析失败则跳过本条消息55 ParseErrTypeAlways //消息解析失败依然处理56 ParseErrTypeClose //消息解析失败则关闭连接57)58type ParseFunc func() interface{}59type IParser interface {60 GetType() ParserType61 GetErrType() ParseErrType62 ParseC2S(msg *Message) (IMsgParser, error)63 PackMsg(v interface{}) []byte64 GetRemindMsg(err error, t MsgType) *Message65}66type Parser struct {67 Type ParserType68 ErrType ParseErrType69 msgMap map[int]MsgParser70 cmdRoot *cmdParseNode71 jsonMap map[string]*jsonParseNode72 parser IParser73}74func (r *Parser) Get() IParser {75 switch r.Type {76 case ParserTypePB:77 if r.parser == nil {78 r.parser = &pBParser{r}79 }80 case ParserTypeJson:81 if r.parser == nil {82 r.parser = &jsonParser{r}83 }84 case ParserTypeCmd:85 return &cmdParser{factory: r}86 case ParserTypeRaw:87 return nil88 }89 return r.parser90}91func (r *Parser) RegisterFunc(cmd, act uint8, c2sFunc ParseFunc, s2cFunc ParseFunc) {92 if r.msgMap == nil {93 r.msgMap = map[int]MsgParser{}94 }95 r.msgMap[CmdAct(cmd, act)] = MsgParser{c2sFunc: c2sFunc, s2cFunc: s2cFunc}96}97func (r *Parser) Register(cmd, act uint8, c2s interface{}, s2c interface{}) {98 if r.msgMap == nil {99 r.msgMap = map[int]MsgParser{}100 }101 p := MsgParser{}102 if c2s != nil {103 c2sType := reflect.TypeOf(c2s).Elem()104 p.c2sFunc = func() interface{} {105 return reflect.New(c2sType).Interface()106 }107 }108 if s2c != nil {109 s2cType := reflect.TypeOf(s2c).Elem()110 p.s2cFunc = func() interface{} {111 return reflect.New(s2cType).Interface()112 }113 }114 if c2s != nil || s2c != nil {115 r.msgMap[CmdAct(cmd, act)] = p116 }117}118func (r *Parser) RegisterMsgFunc(c2sFunc ParseFunc, s2cFunc ParseFunc) {119 if r.Type == ParserTypeCmd {120 if r.cmdRoot == nil {121 r.cmdRoot = &cmdParseNode{}122 }123 registerCmdParser(r.cmdRoot, c2sFunc, s2cFunc)124 }125 if r.Type == ParserTypeJson {126 if r.jsonMap == nil {127 r.jsonMap = map[string]*jsonParseNode{}128 }129 registerJsonParser(r.jsonMap, c2sFunc, s2cFunc)130 }131}132func (r *Parser) RegisterMsg(c2s interface{}, s2c interface{}) {133 var c2sFunc ParseFunc = nil134 var s2cFunc ParseFunc = nil135 if c2s != nil {136 c2sType := reflect.TypeOf(c2s).Elem()137 c2sFunc = func() interface{} {138 return reflect.New(c2sType).Interface()139 }140 }141 if s2c != nil {142 s2cType := reflect.TypeOf(s2c).Elem()143 s2cFunc = func() interface{} {144 return reflect.New(s2cType).Interface()145 }146 }147 if r.Type == ParserTypeCmd {148 if r.cmdRoot == nil {149 r.cmdRoot = &cmdParseNode{}150 }151 registerCmdParser(r.cmdRoot, c2sFunc, s2cFunc)152 }153 if r.Type == ParserTypeJson {154 if r.jsonMap == nil {155 r.jsonMap = map[string]*jsonParseNode{}156 }157 registerJsonParser(r.jsonMap, c2sFunc, s2cFunc)158 }159}...

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parser_json.go

Source:parser_json.go Github

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2import (3 "encoding/json"4 "reflect"5)6type jsonParser struct {7 factory *Parser8}9type jsonParseNode struct {10 c2sFunc ParseFunc11 s2cFunc ParseFunc12}13func (r *jsonParser) ParseC2S(msg *Message) (IMsgParser, error) {14 if msg == nil {15 return nil, ErrJsonUnPack16 }17 if msg.Head == nil {18 m := map[string]json.RawMessage{}19 if json.Unmarshal(msg.Data, &m) == nil {20 for k, v := range m {21 node, ok := r.factory.jsonMap[k]22 if ok {23 c2s := node.c2sFunc()24 if json.Unmarshal(v, c2s) == nil {25 return &MsgParser{c2s: c2s, parser: r, s2cFunc: node.s2cFunc}, nil26 }27 }28 }29 }30 } else {31 p, ok := r.factory.msgMap[msg.Head.CmdAct()]32 if ok {33 if p.C2S() != nil {34 err := JsonUnPack(msg.Data, p.C2S())35 if err != nil {36 return nil, err37 }38 p.parser = r39 return &p, nil40 }41 }42 }43 return nil, ErrJsonUnPack44}45func (r *jsonParser) PackMsg(v interface{}) []byte {46 data, _ := JsonPack(v)47 return data48}49func (r *jsonParser) GetRemindMsg(err error, t MsgType) *Message {50 if t == MsgTypeMsg {51 return NewErrMsg(err)52 } else {53 return NewStrMsg(err.Error() + "\n")54 }55}56func (r *jsonParser) GetType() ParserType {57 return r.factory.Type58}59func (r *jsonParser) GetErrType() ParseErrType {60 return r.factory.ErrType61}62func JsonUnPack(data []byte, msg interface{}) error {63 if data == nil || msg == nil {64 return ErrJsonUnPack65 }66 err := json.Unmarshal(data, msg)67 if err != nil {68 return ErrJsonUnPack69 }70 return nil71}72func JsonPack(msg interface{}) ([]byte, error) {73 if msg == nil {74 return nil, ErrJsonPack75 }76 data, err := json.Marshal(msg)77 if err != nil {78 LogInfo("")79 return nil, ErrJsonPack80 }81 return data, nil82}83func registerJsonParser(jm map[string]*jsonParseNode, c2sFunc ParseFunc, s2cFunc ParseFunc) {84 msgType := reflect.TypeOf(c2sFunc())85 if msgType == nil || msgType.Kind() != reflect.Ptr {86 LogFatal("message pointer required")87 return88 }89 typ := msgType.Elem()90 jm[typ.Name()] = &jsonParseNode{c2sFunc, s2cFunc}91}...

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Parse

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1import (2type Response1 struct {3}4type Response2 struct {5}6func main() {7 bolB, _ := json.Marshal(true)8 fmt.Println(string(bolB))9 intB, _ := json.Marshal(1)10 fmt.Println(string(intB))11 fltB, _ := json.Marshal(2.34)12 fmt.Println(string(fltB))13 strB, _ := json.Marshal("gopher")14 fmt.Println(string(strB))15 slcD := []string{"apple", "peach", "pear"}16 slcB, _ := json.Marshal(slcD)17 fmt.Println(string(slcB))18 mapD := map[string]int{"apple": 5, "lettuce": 7}19 mapB, _ := json.Marshal(mapD)20 fmt.Println(string(mapB))21 res1D := &Response1{22 Fruits: []string{"apple", "peach", "pear"}}23 res1B, _ := json.Marshal(res1D)24 fmt.Println(string(res1B))25 res2D := &Response2{26 Fruits: []string{"apple", "peach", "pear"}}27 res2B, _ := json.Marshal(res2D)28 fmt.Println(string(res2B))29 byt := []byte(`{"num":6.13,"strs":["a","b"]}`)30 var dat map[string]interface{}31 if err := json.Unmarshal(byt, &dat); err != nil {32 panic(err)33 }34 fmt.Println(dat)35 num := dat["num"].(float64)36 fmt.Println(num)37 strs := dat["strs"].([]interface{})38 str1 := strs[0].(string)39 fmt.Println(str1)40 str := `{"page": 1, "fruits": ["apple", "peach"]}`41 res := Response2{}42 json.Unmarshal([]byte(str), &res)43 fmt.Println(res)44 fmt.Println(res.Fruits[0])45 enc := json.NewEncoder(os.Stdout)46 d := map[string]int{"apple": 5,

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Parse

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1import (2func main() {3 type Response1 struct {4 }5 bolB, _ := json.Marshal(true)6 fmt.Println(string(bolB))7 intB, _ := json.Marshal(1)8 fmt.Println(string(intB))9 fltB, _ := json.Marshal(2.34)10 fmt.Println(string(fltB))11 strB, _ := json.Marshal("gopher")12 fmt.Println(string(strB))13 slcD := []string{"apple", "peach", "pear"}14 slcB, _ := json.Marshal(slcD)15 fmt.Println(string(slcB))16 mapD := map[string]int{"apple": 5, "lettuce": 7}17 mapB, _ := json.Marshal(mapD)18 fmt.Println(string(mapB))19 res1D := &Response1{20 Fruits: []string{"apple", "peach", "pear"}}21 res1B, _ := json.Marshal(res1D)22 fmt.Println(string(res1B))23 byt := []byte(`{"num":6.13,"strs":["a","b"]}`)24 var dat map[string]interface{}25 if err := json.Unmarshal(byt, &dat); err != nil {26 panic(err)27 }28 fmt.Println(dat)29 num := dat["num"].(float64)30 fmt.Println(num)31 strs := dat["strs"].([]interface{})32 str1 := strs[0].(string)33 fmt.Println(str1)34 str := `{"page": 1, "fruits": ["apple", "peach"]}`35 res := Response1{}36 json.Unmarshal([]byte(str), &res)37 fmt.Println(res)38 fmt.Println(res.Fruits[0])39 enc := json.NewEncoder(os.Stdout)40 d := map[string]int{"apple": 5, "lettuce": 7}41 enc.Encode(d)42}43{"apple":5,"lettuce":7}44{"Page":1,"Fruits":["apple","peach","pear"]}45{1

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Parse

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1import (2type Person struct {3}4func main() {5 rdr := strings.NewReader(`{"First":"James","Last":"Bond","Age":20}`)6 json.NewDecoder(rdr).Decode(&p1)7 fmt.Println(p1.First)8 fmt.Println(p1.Last)9 fmt.Println(p1.Age)10}11import (12type Person struct {13}14func main() {15 p1 := Person{"James", "Bond", 20}16 bs, _ := json.Marshal(p1)17 fmt.Println(bs)18 fmt.Printf("%T \n", bs)19 fmt.Println(string(bs))20}21import (22type Person struct {23}24func main() {25 bs := []byte(`{"First":"James","Last":"Bond","Age":20}`)26 json.Unmarshal(bs, &p1)27 fmt.Println(p1.First)28 fmt.Println(p1.Last)29 fmt.Println(p1.Age)30}31import (32type Person struct {33}34func main() {35 p1 := Person{"James", "Bond", 20}36 bs, _ := json.MarshalIndent(p1, "", " ")37 fmt.Println(string(bs))38}39import (40type Person struct {41}42func main() {43 p1 := Person{"James", "Bond", 20}44 p2 := Person{"Miss", "Moneypenny", 19}45 people := []Person{p1, p2}46 fmt.Println(people)47 bs, _ := json.Marshal(people)48 fmt.Println(string(bs))49}

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Parse

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1import (2type Person struct {3}4func main() {5 rdr := strings.NewReader(`{"First":"James", "Last":"Bond", "Age":20}`)6 json.NewDecoder(rdr).Decode(&p1)7 fmt.Println(p1.First)8 fmt.Println(p1.Last)9 fmt.Println(p1.Age)10}

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Parse

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1import (2type Person struct {3}4func main() {5 r := `[{"First":"James","Last":"Bond","Age":20},{"First":"Miss","Last":"Moneypenny","Age":19}]`6 bs := []byte(r)7 fmt.Printf("%T8 fmt.Printf("%T9 json.Unmarshal(bs, &p1)10 fmt.Println("---------------")11 fmt.Println(p1.First)12 fmt.Println(p1.Last)13 fmt.Println(p1.Age)14}15import (16type Person struct {17}18func main() {19 r := `[{"First":"James","Last":"Bond","Age":20},{"First":"Miss","Last":"Moneypenny","Age":19}]`20 bs := []byte(r)21 fmt.Printf("%T22 fmt.Printf("%T23 json.Unmarshal(bs, &people)24 fmt.Println("---------------")25 fmt.Println(people)26 for i, v := range people {27 fmt.Println("Person Number", i)28 fmt.Println(v.First, v.Last, v.Age)29 }30}31[{James Bond 20 0} {Miss Moneypenny 19 0}]32import (

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1import (2type Person struct {3}4func main() {5 var p1 = Person{Name: "John", Age: 20}6 fmt.Println("p1 =", p1)7 b, _ := json.Marshal(p1)8 fmt.Println("b =", string(b))9 json.Unmarshal(b, &p2)10 fmt.Println("p2 =", p2)11}12p1 = {John 20}13b = {"Name":"John","Age":20}14p2 = {John 20}

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1import (2type Student struct {3}4func main() {5 jsonString := `{"Name":"John", "Age":30}`6 err := json.Unmarshal([]byte(jsonString), &student)7 if err != nil {8 fmt.Println(err)9 }10 fmt.Println(student)11}12{John 30}134. json.Marshal() method14import (15type Student struct {16}17func main() {18 student := Student{Name: "John", Age: 30}19 jsonString, err := json.Marshal(student)20 if err != nil {21 fmt.Println(err)22 }23 fmt.Println(string(jsonString))24}25{"Name":"John","Age":30}265. json.MarshalIndent() method27import (28type Student struct {29}30func main() {31 student := Student{Name: "John", Age: 30}32 jsonString, err := json.MarshalIndent(student, "", " ")33 if err != nil {34 fmt.Println(err)35 }36 fmt.Println(string(jsonString))37}38{39}406. json.Decoder() method41import (42type Student struct {43}44func main() {45 jsonString := `{"Name":"John", "Age":30}`

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1import (2func main() {3 var data = []byte(`{"Name":"John", "Age":30, "City":"New York"}`)4 var result map[string]interface{}5 json.Unmarshal(data, &result)6 fmt.Println(result)7}8import (9func main() {10 var data = map[string]interface{}{11 }12 result, _ := json.Marshal(data)13 fmt.Println(string(result))14}15{"Name":"John","Age":30,"City":"New York"}16import (17func main() {18 var data = map[string]interface{}{19 }20 result, _ := json.MarshalIndent(data, "", " ")21 fmt.Println(string(result))22}23{24}

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1import (2func main() {3 jsonString := `{"name":"Alex","age":21,"city":"New York"}`4 var data map[string]interface{}5 err := json.Unmarshal([]byte(jsonString), &data)6 if err != nil {7 fmt.Println(err)8 }9}

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