Method parseNext

internal/encoding/json/decode.go:160–213

parseNext parses for the next JSON token. It returns a Token object for different types, except for Name. It does not handle whether the next token is in a valid sequence or not.

()

// different types, except for Name. It does not handle whether the next token
// is in a valid sequence or not.
func (d *Decoder) parseNext() (Token, error) {
	// Trim leading spaces.
	d.consume(0)

	in := d.in
	if len(in) == 0 {
		return d.consumeToken(EOF, 0), nil
	}

	switch in[0] {
	case 'n':
		if n := matchWithDelim("null", in); n != 0 {
			return d.consumeToken(Null, n), nil
		}

	case 't':
		if n := matchWithDelim("true", in); n != 0 {
			return d.consumeBoolToken(true, n), nil
		}

	case 'f':
		if n := matchWithDelim("false", in); n != 0 {
			return d.consumeBoolToken(false, n), nil
		}

	case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		if n, ok := parseNumber(in); ok {
			return d.consumeToken(Number, n), nil
		}

	case '"':
		s, n, err := d.parseString(in)
		if err != nil {
			return Token{}, err
		}
		return d.consumeStringToken(s, n), nil

	case '{':
		return d.consumeToken(ObjectOpen, 1), nil

	case '}':
		return d.consumeToken(ObjectClose, 1), nil

	case '[':
		return d.consumeToken(ArrayOpen, 1), nil

	case ']':
		return d.consumeToken(ArrayClose, 1), nil

	case ',':
		return d.consumeToken(comma, 1), nil
	}
	return Token{}, d.newSyntaxError(d.currPos(), "invalid value %s", errRegexp.Find(in))
}

// newSyntaxError returns an error with line and column information useful for
// syntax errors.