138 lines
2.4 KiB
Go
138 lines
2.4 KiB
Go
//go:build ignore
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// +build ignore
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package main
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import (
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"fmt"
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"go.neonxp.ru/unilex"
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)
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func main() {
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testJson := `
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{
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"key1": "value1",
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"key2": {
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"key3" : "value 3"
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},
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"key4": 123.321,
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"key5": [
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1,
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2,
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[
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3,
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4,
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5,
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{
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"key6": "value6"
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}
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]
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]
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}`
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l := unilex.New(testJson)
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go l.Run(initJson)
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for ll := range l.Output {
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fmt.Println(ll)
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}
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}
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const (
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lObjectStart unilex.LexType = iota
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lObjectEnd
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lObjectKey
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lObjectValue
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lArrayStart
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lArrayEnd
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lString
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lNumber
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)
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func initJson(l *unilex.Lexer) unilex.StateFunc {
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ignoreWhiteSpace(l)
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switch {
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case l.Accept("{"):
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l.Emit(lObjectStart)
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return stateInObject
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case l.Peek() == unilex.EOF:
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return nil
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}
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return l.Errorf("Unknown token: %s", string(l.Peek()))
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}
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func stateInObject(l *unilex.Lexer) unilex.StateFunc {
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// we in object, so we expect field keys and values
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ignoreWhiteSpace(l)
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if l.Accept("}") {
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l.Emit(lObjectEnd)
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// If meet close object return to previous state (including initial)
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return l.PopState()
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}
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ignoreWhiteSpace(l)
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l.Accept(",")
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ignoreWhiteSpace(l)
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if !unilex.ScanQuotedString(l, '"') {
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return l.Errorf("Unknown token: %s", string(l.Peek()))
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}
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l.Emit(lObjectKey)
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ignoreWhiteSpace(l)
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if !l.Accept(":") {
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return l.Errorf("Expected ':'")
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}
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ignoreWhiteSpace(l)
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l.Emit(lObjectValue)
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switch {
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case unilex.ScanQuotedString(l, '"'):
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l.Emit(lString)
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ignoreWhiteSpace(l)
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l.Accept(",")
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l.Ignore()
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ignoreWhiteSpace(l)
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return stateInObject
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case unilex.ScanNumber(l):
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l.Emit(lNumber)
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ignoreWhiteSpace(l)
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l.Accept(",")
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l.Ignore()
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ignoreWhiteSpace(l)
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return stateInObject
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case l.Accept("{"):
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l.Emit(lObjectStart)
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l.PushState(stateInObject)
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return stateInObject
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case l.Accept("["):
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l.Emit(lArrayStart)
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l.PushState(stateInObject)
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return stateInArray
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}
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return l.Errorf("Unknown token: %s", string(l.Peek()))
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}
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func stateInArray(l *unilex.Lexer) unilex.StateFunc {
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ignoreWhiteSpace(l)
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l.Accept(",")
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ignoreWhiteSpace(l)
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switch {
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case unilex.ScanQuotedString(l, '"'):
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l.Emit(lString)
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case unilex.ScanNumber(l):
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l.Emit(lNumber)
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case l.Accept("{"):
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l.Emit(lObjectStart)
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l.PushState(stateInArray)
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return stateInObject
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case l.Accept("["):
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l.Emit(lArrayStart)
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l.PushState(stateInArray)
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return stateInArray
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case l.Accept("]"):
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l.Emit(lArrayEnd)
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return l.PopState()
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}
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return stateInArray
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}
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func ignoreWhiteSpace(l *unilex.Lexer) {
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l.AcceptWhile(" \n\t") //ignore whitespaces
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l.Ignore()
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}
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