func()

in internal/encoding/json/stream.go [368:460]

• 86 lines of code
• 24 McCabe index (conditional complexity)

func (dec *Decoder) Token() (Token, error) {
	for {
		c, err := dec.peek()
		if err != nil {
			return nil, err
		}
		switch c {
		case '[':
			if !dec.tokenValueAllowed() {
				return dec.tokenError(c)
			}
			dec.scanp++
			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
			dec.tokenState = tokenArrayStart
			return Delim('['), nil

		case ']':
			if dec.tokenState != tokenArrayStart && dec.tokenState != tokenArrayComma {
				return dec.tokenError(c)
			}
			dec.scanp++
			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
			dec.tokenValueEnd()
			return Delim(']'), nil

		case '{':
			if !dec.tokenValueAllowed() {
				return dec.tokenError(c)
			}
			dec.scanp++
			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
			dec.tokenState = tokenObjectStart
			return Delim('{'), nil

		case '}':
			if dec.tokenState != tokenObjectStart && dec.tokenState != tokenObjectComma {
				return dec.tokenError(c)
			}
			dec.scanp++
			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
			dec.tokenValueEnd()
			return Delim('}'), nil

		case ':':
			if dec.tokenState != tokenObjectColon {
				return dec.tokenError(c)
			}
			dec.scanp++
			dec.tokenState = tokenObjectValue
			continue

		case ',':
			if dec.tokenState == tokenArrayComma {
				dec.scanp++
				dec.tokenState = tokenArrayValue
				continue
			}
			if dec.tokenState == tokenObjectComma {
				dec.scanp++
				dec.tokenState = tokenObjectKey
				continue
			}
			return dec.tokenError(c)

		case '"':
			if dec.tokenState == tokenObjectStart || dec.tokenState == tokenObjectKey {
				var x string
				old := dec.tokenState
				dec.tokenState = tokenTopValue
				err := dec.Decode(&x)
				dec.tokenState = old
				if err != nil {
					return nil, err
				}
				dec.tokenState = tokenObjectColon
				return x, nil
			}
			fallthrough

		default:
			if !dec.tokenValueAllowed() {
				return dec.tokenError(c)
			}
			var x any
			if err := dec.Decode(&x); err != nil {
				return nil, err
			}
			return x, nil
		}
	}
}