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How to use Ident method of kconfig Package

Best Syzkaller code snippet using kconfig.Ident

kconfig.go

Source:kconfig.go

...100	includes  []*parser101	stack     []*Menu102	cur       *Menu103	baseDir   string104	helpIdent int105}106func Parse(target *targets.Target, file string) (*KConfig, error) {107	data, err := ioutil.ReadFile(file)108	if err != nil {109		return nil, fmt.Errorf("failed to open Kconfig file %v: %v", file, err)110	}111	return ParseData(target, data, file)112}113func ParseData(target *targets.Target, data []byte, file string) (*KConfig, error) {114	kp := &kconfigParser{115		parser:  newParser(data, file),116		target:  target,117		baseDir: filepath.Dir(file),118	}119	kp.parseFile()120	if kp.err != nil {121		return nil, kp.err122	}123	if len(kp.stack) == 0 {124		return nil, fmt.Errorf("no mainmenu in config")125	}126	root := kp.stack[0]127	kconf := &KConfig{128		Root:    root,129		Configs: make(map[string]*Menu),130	}131	kconf.walk(root, nil, nil)132	return kconf, nil133}134func (kconf *KConfig) walk(m *Menu, dependsOn, visibleIf expr) {135	m.kconf = kconf136	m.dependsOn = exprAnd(dependsOn, m.dependsOn)137	m.visibleIf = exprAnd(visibleIf, m.visibleIf)138	if m.Kind == MenuConfig {139		kconf.Configs[m.Name] = m140	}141	for _, elem := range m.Elems {142		kconf.walk(elem, m.dependsOn, m.visibleIf)143	}144}145func (kp *kconfigParser) parseFile() {146	for kp.nextLine() {147		kp.parseLine()148		if kp.TryConsume("#") {149			_ = kp.ConsumeLine()150		}151	}152	kp.endCurrent()153}154func (kp *kconfigParser) parseLine() {155	if kp.eol() {156		return157	}158	if kp.helpIdent != 0 {159		if kp.identLevel() >= kp.helpIdent {160			_ = kp.ConsumeLine()161			return162		}163		kp.helpIdent = 0164	}165	if kp.TryConsume("#") {166		_ = kp.ConsumeLine()167		return168	}169	if kp.TryConsume("$") {170		_ = kp.Shell()171		return172	}173	ident := kp.Ident()174	if kp.TryConsume("=") || kp.TryConsume(":=") {175		// Macro definition, see:176		// https://www.kernel.org/doc/html/latest/kbuild/kconfig-macro-language.html177		// We don't use this for anything now.178		kp.ConsumeLine()179		return180	}181	kp.parseMenu(ident)182}183func (kp *kconfigParser) parseMenu(cmd string) {184	switch cmd {185	case "source":186		file, ok := kp.TryQuotedString()187		if !ok {188			file = kp.ConsumeLine()189		}190		kp.includeSource(file)191	case "mainmenu":192		kp.pushCurrent(&Menu{193			Kind:    MenuConfig,194			prompts: []prompt{{text: kp.QuotedString()}},195		})196	case "comment":197		kp.newCurrent(&Menu{198			Kind:    MenuComment,199			prompts: []prompt{{text: kp.QuotedString()}},200		})201	case "menu":202		kp.pushCurrent(&Menu{203			Kind:    MenuGroup,204			prompts: []prompt{{text: kp.QuotedString()}},205		})206	case "if":207		kp.pushCurrent(&Menu{208			Kind:      MenuGroup,209			visibleIf: kp.parseExpr(),210		})211	case "choice":212		kp.pushCurrent(&Menu{213			Kind: MenuChoice,214		})215	case "endmenu", "endif", "endchoice":216		kp.popCurrent()217	case "config", "menuconfig":218		kp.newCurrent(&Menu{219			Kind: MenuConfig,220			Name: kp.Ident(),221		})222	default:223		kp.parseConfigType(cmd)224	}225}226func (kp *kconfigParser) parseConfigType(typ string) {227	cur := kp.current()228	switch typ {229	case "tristate":230		cur.Type = TypeTristate231		kp.tryParsePrompt()232	case "def_tristate":233		cur.Type = TypeTristate234		kp.parseDefaultValue()235	case "bool":236		cur.Type = TypeBool237		kp.tryParsePrompt()238	case "def_bool":239		cur.Type = TypeBool240		kp.parseDefaultValue()241	case "int":242		cur.Type = TypeInt243		kp.tryParsePrompt()244	case "def_int":245		cur.Type = TypeInt246		kp.parseDefaultValue()247	case "hex":248		cur.Type = TypeHex249		kp.tryParsePrompt()250	case "def_hex":251		cur.Type = TypeHex252		kp.parseDefaultValue()253	case "string":254		cur.Type = TypeString255		kp.tryParsePrompt()256	case "def_string":257		cur.Type = TypeString258		kp.parseDefaultValue()259	default:260		kp.parseProperty(typ)261	}262}263func (kp *kconfigParser) parseProperty(prop string) {264	cur := kp.current()265	switch prop {266	case "prompt":267		kp.tryParsePrompt()268	case "depends":269		kp.MustConsume("on")270		cur.dependsOn = exprAnd(cur.dependsOn, kp.parseExpr())271	case "visible":272		kp.MustConsume("if")273		cur.visibleIf = exprAnd(cur.visibleIf, kp.parseExpr())274	case "select", "imply":275		_ = kp.Ident()276		if kp.TryConsume("if") {277			_ = kp.parseExpr()278		}279	case "option":280		// It can be 'option foo', or 'option bar="BAZ"'.281		kp.ConsumeLine()282	case "modules":283	case "optional":284	case "default":285		kp.parseDefaultValue()286	case "range":287		_, _ = kp.parseExpr(), kp.parseExpr() // from, to288		if kp.TryConsume("if") {289			_ = kp.parseExpr()290		}291	case "help", "---help---":292		// Help rules are tricky: end of help is identified by smaller indentation level293		// as would be rendered on a terminal with 8-column tabs setup, minus empty lines.294		for kp.nextLine() {295			if kp.eol() {296				continue297			}298			kp.helpIdent = kp.identLevel()299			kp.ConsumeLine()300			break301		}302	default:303		kp.failf("unknown line")304	}305}306func (kp *kconfigParser) includeSource(file string) {307	kp.newCurrent(nil)308	file = kp.expandString(file)309	file = filepath.Join(kp.baseDir, file)310	data, err := ioutil.ReadFile(file)311	if err != nil {312		kp.failf("%v", err)...

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