func (parser *Parser) parseArray(parent *value.JSONValue) error {
firstToken, err := parser.tokenizer.NextToken()
if err != nil {
return err
}
if !firstToken.IsEqualTo(token.NewTokenBeginArray()) {
return fmt.Errorf("%#v is invalid begin array token", firstToken)
}
parent.ArrayValue = make([]value.JSONValue, 0)
for {
peekedToken, err := parser.tokenizer.PeekToken(0)
if err != nil {
return err
}
if peekedToken.IsEqualTo(token.NewTokenEndArray()) {
parser.tokenizer.NextToken()
break
}
itemValue := value.NewJSONValue()
err = parser.parseValue(&itemValue)
if err != nil {
return err
}
parent.ArrayValue = append(parent.ArrayValue, itemValue)
maybeComma, err := parser.tokenizer.PeekToken(0)
if err == nil && maybeComma.IsEqualTo(token.NewTokenComma()) {
parser.tokenizer.NextToken()
continue
}
}
return nil
}
func (parser *Parser) parseObject(parent *value.JSONValue) error {
parent.ObjectValue = make(map[string]value.JSONValue)
firstToken, err := parser.tokenizer.NextToken()
if err != nil {
return err
}
if !firstToken.IsEqualTo(token.NewTokenBeginObject()) {
return fmt.Errorf("JSON Object must start wit '{'")
}
for {
nextToken, err := parser.tokenizer.PeekToken(0)
if err != nil {
return err
}
// End Of Object.
if nextToken.IsEqualTo(token.NewTokenEndObject()) {
parser.tokenizer.NextToken()
break
}
// String Token must be key of object.
if nextToken.IsSameKindTo(token.NewTokenString()) {
parser.tokenizer.NextToken()
mustbeSeparator, err := parser.tokenizer.NextToken()
if err != nil {
return err
}
if !mustbeSeparator.IsEqualTo(token.NewTokenSeparator()) {
return fmt.Errorf("Object KeyValue Separator not found, %#v", mustbeSeparator)
}
currentValue := value.NewJSONValue()
err = parser.parseValue(¤tValue)
if err != nil {
return err
}
parent.ObjectValue[nextToken.Value] = currentValue
// If comma exists after value of object,
// continuous token must be string which is key of the object too.
maybeComma, err := parser.tokenizer.PeekToken(0)
if err == nil && maybeComma.IsEqualTo(token.NewTokenComma()) {
parser.tokenizer.NextToken()
continue
}
break
}
return fmt.Errorf("Invalid JSON. Object is wrong")
}
return nil
}
// Parse parses JSON.
func (parser *Parser) Parse() (value.JSONValue, error) {
firstToken, err := parser.tokenizer.PeekToken(0)
if err != nil {
return value.NewJSONValue(), err
}
if firstToken.IsEqualTo(token.NewTokenBeginObject()) {
parent := value.NewJSONValue()
err := parser.parseObject(&parent)
if err != nil {
return value.NewJSONValue(), err
}
return parent, nil
}
if firstToken.IsEqualTo(token.NewTokenBeginArray()) {
parent := value.NewJSONValue()
err := parser.parseArray(&parent)
if err != nil {
return value.NewJSONValue(), err
}
return parent, nil
}
return value.NewJSONValue(), fmt.Errorf("Invalid JSON")
}