TestMu Conference is Back! Future of Testing + AIRegister for Free

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}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.