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How to use Lex method of json Package

Best Go-testdeep code snippet using json.Lex

parse.go

Source:parse.go

...154	chr[0] = '"';155	b.Write(chr0);156	return b.String();157}158// _Lexer159type _Lexer struct {160	s	string;161	i	int;162	kind	int;163	token	string;164}165func punct(c byte) bool {166	return c == '"' || c == '[' || c == ']' || c == ':' || c == '{' || c == '}' || c == ',';167}168func white(c byte) bool {169	return c == ' ' || c == '\t' || c == '\n' || c == '\v';170}171func skipwhite(p string, i int) int {172	for i < len(p) && white(p[i]) {173		i++;174	}175	return i;176}177func skiptoken(p string, i int) int {178	for i < len(p) && !punct(p[i]) && !white(p[i]) {179		i++;180	}181	return i;182}183func skipstring(p string, i int) int {184	for i++; i < len(p) && p[i] != '"'; i++ {185		if p[i] == '\\' {186			i++;187		}188	}189	if i >= len(p) {190		return i;191	}192	return i+1;193}194func (t *_Lexer) Next() {195	i, s := t.i, t.s;196	i = skipwhite(s, i);197	if i >= len(s) {198		t.kind = 0;199		t.token = "";200		t.i = len(s);201		return;202	}203	c := s[i];204	switch {205	case c == '-' || '0' <= c && c <= '9':206		j := skiptoken(s, i);207		t.kind = '1';208		t.token = s[i:j];209		i = j;210	case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z':211		j := skiptoken(s, i);212		t.kind = 'a';213		t.token = s[i:j];214		i = j;215	case c == '"':216		j := skipstring(s, i);217		t.kind = '"';218		t.token = s[i:j];219		i = j;220	case c == '[', c == ']', c == ':', c == '{', c == '}', c == ',':221		t.kind = int(c);222		t.token = s[i : i+1];223		i++;224	default:225		t.kind = '?';226		t.token = s[i : i+1];227	}228	t.i = i;229}230// Parser231//232// Implements parsing but not the actions.  Those are233// carried out by the implementation of the Builder interface.234// A Builder represents the object being created.235// Calling a method like Int64(i) sets that object to i.236// Calling a method like Elem(i) or Key(s) creates a237// new builder for a subpiece of the object (logically,238// an array element or a map key).239//240// There are two Builders, in other files.241// The JsonBuilder builds a generic Json structure242// in which maps are maps.243// The StructBuilder copies data into a possibly244// nested data structure, using the "map keys"245// as struct field names.246type _Value interface{}247// BUG(rsc): The json Builder interface needs to be248// reconciled with the xml Builder interface.249// A Builder is an interface implemented by clients and passed250// to the JSON parser.  It gives clients full control over the251// eventual representation returned by the parser.252type Builder interface {253	// Set value254	Int64(i int64);255	Uint64(i uint64);256	Float64(f float64);257	String(s string);258	Bool(b bool);259	Null();260	Array();261	Map();262	// Create sub-Builders263	Elem(i int) Builder;264	Key(s string) Builder;265	// Flush changes to parent Builder if necessary.266	Flush();267}268func parse(lex *_Lexer, build Builder) bool {269	ok := false;270Switch:271	switch lex.kind {272	case 0:273		break;274	case '1':275		// If the number is exactly an integer, use that.276		if i, err := strconv.Atoi64(lex.token); err == nil {277			build.Int64(i);278			ok = true;279		} else if i, err := strconv.Atoui64(lex.token); err == nil {280			build.Uint64(i);281			ok = true;282		} else283		// Fall back to floating point.284		if f, err := strconv.Atof64(lex.token); err == nil {285			build.Float64(f);286			ok = true;287		}288	case 'a':289		switch lex.token {290		case "true":291			build.Bool(true);292			ok = true;293		case "false":294			build.Bool(false);295			ok = true;296		case "null":297			build.Null();298			ok = true;299		}300	case '"':301		if str, ok1 := Unquote(lex.token); ok1 {302			build.String(str);303			ok = true;304		}305	case '[':306		// array307		build.Array();308		lex.Next();309		n := 0;310		for lex.kind != ']' {311			if n > 0 {312				if lex.kind != ',' {313					break Switch;314				}315				lex.Next();316			}317			if !parse(lex, build.Elem(n)) {318				break Switch;319			}320			n++;321		}322		ok = true;323	case '{':324		// map325		lex.Next();326		build.Map();327		n := 0;328		for lex.kind != '}' {329			if n > 0 {330				if lex.kind != ',' {331					break Switch;332				}333				lex.Next();334			}335			if lex.kind != '"' {336				break Switch;337			}338			key, ok := Unquote(lex.token);339			if !ok {340				break Switch;341			}342			lex.Next();343			if lex.kind != ':' {344				break Switch;345			}346			lex.Next();347			if !parse(lex, build.Key(key)) {348				break Switch;349			}350			n++;351		}352		ok = true;353	}354	if ok {355		lex.Next();356	}357	build.Flush();358	return ok;359}360// Parse parses the JSON syntax string s and makes calls to361// the builder to construct a parsed representation.362// On success, it returns with ok set to true.363// On error, it returns with ok set to false, errindx set364// to the byte index in s where a syntax error occurred,365// and errtok set to the offending token.366func Parse(s string, builder Builder) (ok bool, errindx int, errtok string) {367	lex := new(_Lexer);368	lex.s = s;369	lex.Next();370	if parse(lex, builder) {371		if lex.kind == 0 {	// EOF372			return true, 0, "";373		}374	}375	return false, lex.i, lex.token;376}...

lex.go

Source:lex.go

...8)9//go:generate go tool yacc -p "json" parse.y10// This marks the end of the lexer11const lexEOF = 012// The parser uses the type <prefix>Lex as a lexer.  It must provide13// the methods Lex(*<prefix>SymType) int and Error(string).14type jsonLex struct {15	Input string16	pos       int17	width     int18	col, line int19	err       error20}21// The parser calls this method to get each new token.22func (x *jsonLex) Lex(yylval *jsonSymType) int {23	for {24		c := x.next()25		if c == lexEOF {26			return lexEOF27		}28		// Ignore all whitespace except a newline which we handle29		// specially later.30		if unicode.IsSpace(c) {31			continue32		}33		// If it is a number, lex the number34		if c >= '0' && c <= '9' {35			x.backup()36			return x.lexNumber(yylval)37		}38		switch c {39		case 'e':40			fallthrough41		case 'E':42			switch x.next() {43			case '+':44				return EPLUS45			case '-':46				return EMINUS47			default:48				x.backup()49				return EPLUS50			}51		case '.':52			return PERIOD53		case '-':54			return MINUS55		case ':':56			return COLON57		case ',':58			return COMMA59		case '[':60			return LEFTBRACKET61		case ']':62			return RIGHTBRACKET63		case '{':64			return LEFTBRACE65		case '}':66			return RIGHTBRACE67		case '"':68			return x.lexString(yylval)69		default:70			x.backup()71			return x.lexId(yylval)72		}73	}74}75// lexId lexes an identifier76func (x *jsonLex) lexId(yylval *jsonSymType) int {77	var b bytes.Buffer78	first := true79	for {80		c := x.next()81		if c == lexEOF {82			break83		}84		if !unicode.IsDigit(c) && !unicode.IsLetter(c) && c != '_' && c != '-' {85			x.backup()86			if first {87				x.createErr("Invalid identifier")88				return lexEOF89			}90			break91		}92		first = false93		if _, err := b.WriteRune(c); err != nil {94			return lexEOF95		}96	}97	switch v := b.String(); v {98	case "true":99		return TRUE100	case "false":101		return FALSE102	case "null":103		return NULL104	default:105		x.createErr(fmt.Sprintf("Invalid identifier: %s", v))106		return lexEOF107	}108}109// lexNumber lexes out a number110func (x *jsonLex) lexNumber(yylval *jsonSymType) int {111	var b bytes.Buffer112	gotPeriod := false113	for {114		c := x.next()115		if c == lexEOF {116			break117		}118		if c == '.' {119			if gotPeriod {120				x.backup()121				break122			}123			gotPeriod = true124		} else if c < '0' || c > '9' {125			x.backup()126			break127		}128		if _, err := b.WriteRune(c); err != nil {129			x.createErr(fmt.Sprintf("Internal error: %s", err))130			return lexEOF131		}132	}133	if !gotPeriod {134		v, err := strconv.ParseInt(b.String(), 0, 0)135		if err != nil {136			x.createErr(fmt.Sprintf("Expected number: %s", err))137			return lexEOF138		}139		yylval.num = int(v)140		return NUMBER141	}142	f, err := strconv.ParseFloat(b.String(), 64)143	if err != nil {144		x.createErr(fmt.Sprintf("Expected float: %s", err))145		return lexEOF146	}147	yylval.f = float64(f)148	return FLOAT149}150// lexString extracts a string from the input151func (x *jsonLex) lexString(yylval *jsonSymType) int {152	var b bytes.Buffer153	for {154		c := x.next()155		if c == lexEOF {156			break157		}158		// String end159		if c == '"' {160			break161		}162		// If we're escaping a quote, then escape the quote163		if c == '\\' {164			n := x.next()165			switch n {166			case '"':167				c = n168			case 'n':169				c = '\n'170			case '\\':171				c = n172			default:173				x.backup()174			}175		}176		if _, err := b.WriteRune(c); err != nil {177			return lexEOF178		}179	}180	yylval.str = b.String()181	return STRING182}183// Return the next rune for the lexer.184func (x *jsonLex) next() rune {185	if int(x.pos) >= len(x.Input) {186		x.width = 0187		return lexEOF188	}189	r, w := utf8.DecodeRuneInString(x.Input[x.pos:])190	x.width = w191	x.pos += x.width192	x.col += 1193	if x.line == 0 {194		x.line = 1195	}196	if r == '\n' {197		x.line += 1198		x.col = 0199	}200	return r201}202// peek returns but does not consume the next rune in the input203func (x *jsonLex) peek() rune {204	r := x.next()205	x.backup()206	return r207}208// backup steps back one rune. Can only be called once per next.209func (x *jsonLex) backup() {210	x.col -= 1211	x.pos -= x.width212}213// createErr records the given error214func (x *jsonLex) createErr(msg string) {215	x.err = fmt.Errorf("Line %d, column %d: %s", x.line, x.col, msg)216}217// The parser calls this method on a parse error.218func (x *jsonLex) Error(s string) {219	x.createErr(s)220}...

Lex

Using AI Code Generation

1import (2type Person struct {3}4func main() {5	p1 := Person{"James", "Bond", 20}6	bs, _ := json.Marshal(p1)7	fmt.Println(bs)8	fmt.Printf("%T9	fmt.Println(string(bs))10}11{"First":"James","Last":"Bond","Age":20}12import (13type Person struct {14}15func main() {16	p1 := Person{"James", "Bond", 20}17	bs, _ := json.Marshal(p1)18	fmt.Println(bs)19	fmt.Printf("%T20	fmt.Println(string(bs))21	json.Unmarshal(bs, &p2)22	fmt.Println("--------------")23	fmt.Println(p2.First)24	fmt.Println(p2.Last)25	fmt.Println(p2.Age)26}27{"First":"James","Last":"Bond","Age":20}28import (29type Person struct {30}31func main() {32	p1 := Person{"James", "Bond", 20}33	json.NewEncoder(os.Stdout).Encode(p1)34}35{"

Lex

Using AI Code Generation

1import (2func main() {3	jsonFile, err := os.Open("test.json")4	if err != nil {5		fmt.Println(err)6	}7	fmt.Println("Successfully Opened users.json")8	defer jsonFile.Close()9	byteValue, _ := ioutil.ReadAll(jsonFile)10	json.Unmarshal(byteValue, &users)11	for i := 0; i < len(users.Users); i++ {12		fmt.Println("User Type: " + users.Users[i].Type)13		fmt.Println("User Name: " + users.Users[i].Name)14		fmt.Println("User Facebook Url: " + users.Users[i].Facebook)15	}16}17{18        {19        },20        {21        }22}

Lex

Using AI Code Generation

1import (2func main() {3    var jsonBlob = []byte(`{"Name": "Platypus", "Order": "Monotremata"}`)4    fmt.Printf("%s5    decoder := json.NewDecoder(jsonBlob)6    for {7        token, err := decoder.Token()8        if err != nil {9        }10        fmt.Printf("%T: %v11    }12}13{"Name": "Platypus", "Order": "Monotremata"}14json.Delim: {15json.Delim: }16func Unmarshal(data []byte, v interface{}) error17import (18func main() {19    var jsonBlob = []byte(`{"Name": "Platypus", "Order": "Monotremata"}`)20    err := json.Unmarshal(jsonBlob, &animal)21    if err != nil {22        fmt.Println("error:", err)23    }24    fmt.Println(animal)25    fmt.Println(animal["Name"])26    fmt.Println(animal["Order"])27}28func Marshal(v interface{}) ([]byte, error)29import (30func main() {31    animal := map[string]string{"Name": "Platypus", "Order": "

Lex

Using AI Code Generation

1import (2func main() {3	var f interface{}4	data, err := ioutil.ReadFile("1.json")5	if err != nil {6		log.Fatal(err)7	}8	err = json.Unmarshal(data, &f)9	if err != nil {10		log.Fatal(err)11	}12	fmt.Println(f)13}

Lex

Using AI Code Generation

1import (2func main() {3	file, err := ioutil.ReadFile("1.json")4	if err != nil {5		fmt.Println("Error in reading file")6	}7	var result map[string]interface{}8	json.Unmarshal([]byte(file), &result)9	fmt.Println(result)10}

Lex

Using AI Code Generation

1import (2type Person struct {3}4func main() {5    data, err := ioutil.ReadFile("1.json")6    if err != nil {7        fmt.Println("File reading error", err)8    }9    err = json.Unmarshal(data, &p)10    if err != nil {11        fmt.Println("error:", err)12    }13    fmt.Println(p.Name)14    fmt.Println(p.Age)15}

Lex

Using AI Code Generation

1import (2func main() {3    var jsonString = `{"name": "John", "age": 30}`4    var result map[string]interface{}5    json.Unmarshal([]byte(jsonString), &result)6    for k, v := range result {7        fmt.Println(k, ":", v)8    }9}10func (dec *Decoder) Lex(lval *yySymType) int11import (12func main() {13    var jsonString = `{"name": "John", "age": 30}`14    var result map[string]interface{}15    json.Unmarshal([]byte(jsonString), &result)16    dec := json.NewDecoder(strings.NewReader(jsonString))17    for {18        token, err := dec.Lex(&json.SyntaxError{})19        if err != nil {20        }21        fmt.Println(token)22    }23}

Lex

Using AI Code Generation

1import (2func main() {3	js := `{"name":"John", "age":30, "city":"New York"}`4	dec := json.NewDecoder(strings.NewReader(js))5	for {6		t, err := dec.Token()7		if err != nil {8			log.Fatal(err)9		}10		if t == nil {11		}12		fmt.Printf("%T %v13	}14}15string {16string }17import (18type User struct {19}20func main() {21	js := `{"name":"John", "age":30, "city":"New York"}`22	dec := json.NewDecoder(strings.NewReader(js))23	err := dec.Decode(&u)24	if err != nil {25		log.Fatal(err)26	}27	fmt.Printf("%+v28}29{ Name:John Age:30 City:New York }

Lex

Using AI Code Generation

1import (2func main() {3	dec := json.NewDecoder(strings.NewReader(`{"Name": "Wednesday", "Age": 6, "Parents": ["Gomez", "Morticia"]}`))4	t, err := dec.Token()5	if err != nil {6		fmt.Println(err)7	}8	fmt.Printf("%T9}

Lex

Using AI Code Generation

1func main() {2	jsonString := `{"name":"John","age":30,"cars":["Ford","BMW","Fiat"]}`3	decoder := json.NewDecoder(strings.NewReader(jsonString))4	for {5		token, err := decoder.Token()6		if err == io.EOF || token == nil {7		}8		fmt.Println(token)9	}10}11func (d *Decoder) Lex(l *Lexer) error12import (13func main() {14	jsonString := `{"name":"John","age":30,"cars":["Ford","BMW","Fiat"]}`15	decoder := json.NewDecoder(strings.NewReader(jsonString))16	lexer := json.NewLexer(decoder)17	for {18		token, err := lexer.Lex(nil)19		if err == io.EOF || token == nil {20		}21		fmt.Println(token)22	}23}

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