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// +build ignore
package main
import (
"fmt"
"github.com/neonxp/unilex"
)
func main() {
testJson := `
{
"key1": "value1",
"key2": {
"key3" : "value 3"
},
"key4": 123.321
}`
l := unilex.New(testJson)
go l.Run(initJson)
for ll := range l.Output {
fmt.Println(ll)
}
}
const (
lObjectStart unilex.LexType = "lObjectStart"
lObjectEnd unilex.LexType = "lObjectEnd"
lObjectKey unilex.LexType = "lObjectKey"
lObjectValueString unilex.LexType = "lObjectValueString"
lObjectValueNumber unilex.LexType = "lObjectValueNumber"
)
func initJson(l *unilex.Lexer) unilex.StateFunc {
ignoreWhiteSpace(l)
switch {
case l.Accept("{"):
l.Emit(lObjectStart)
return stateInObject(true)
case l.Peek() == unilex.EOF:
return nil
}
return l.Errorf("Unknown token: %s", l.Peek())
}
func stateInObject(initial bool) unilex.StateFunc {
return func(l *unilex.Lexer) unilex.StateFunc {
// we in object, so we expect field keys and values
ignoreWhiteSpace(l)
if l.Accept("}") {
l.Emit(lObjectEnd)
if initial {
return initJson
}
ignoreWhiteSpace(l)
l.Accept(",")
ignoreWhiteSpace(l)
return stateInObject(initial)
}
if l.Peek() == unilex.EOF {
return nil
}
if !unilex.ScanQuotedString(l, '"') {
return l.Errorf("Unknown token: %s", l.Peek())
}
l.Emit(lObjectKey)
ignoreWhiteSpace(l)
if !l.Accept(":") {
return l.Errorf("Expected ':'")
}
ignoreWhiteSpace(l)
switch {
case unilex.ScanQuotedString(l, '"'):
l.Emit(lObjectValueString)
ignoreWhiteSpace(l)
l.Accept(",")
l.Ignore()
ignoreWhiteSpace(l)
return stateInObject(initial)
case unilex.ScanNumber(l):
l.Emit(lObjectValueNumber)
ignoreWhiteSpace(l)
l.Accept(",")
l.Ignore()
ignoreWhiteSpace(l)
return stateInObject(initial)
case l.Accept("{"):
l.Emit(lObjectStart)
return stateInObject(false)
}
return l.Errorf("Unknown token")
}
}
func ignoreWhiteSpace(l *unilex.Lexer) {
l.AcceptWhile(" \n\t") //ignore whitespaces
l.Ignore()
}
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