Function MakeHeader

pkg/highlight/parser.go:99–126

MakeHeader takes a header (.hdr file) file and parses the header Header files make parsing more efficient when you only want to compute on the headers of syntax files A yaml file might take ~400us to parse while a header file only takes ~20us

(data []byte)

// on the headers of syntax files
// A yaml file might take ~400us to parse while a header file only takes ~20us
func MakeHeader(data []byte) (*Header, error) {
	lines := bytes.Split(data, []byte{'\n'})
	if len(lines) < 4 {
		return nil, errors.New("Header file has incorrect format")
	}
	header := new(Header)
	var err error
	header.FileType = string(lines[0])
	fnameRegexStr := string(lines[1])
	headerRegexStr := string(lines[2])
	signatureRegexStr := string(lines[3])

	if fnameRegexStr != "" {
		header.FileNameRegex, err = regexp.Compile(fnameRegexStr)
	}
	if err == nil && headerRegexStr != "" {
		header.HeaderRegex, err = regexp.Compile(headerRegexStr)
	}
	if err == nil && signatureRegexStr != "" {
		header.SignatureRegex, err = regexp.Compile(signatureRegexStr)
	}

	if err != nil {
		return nil, err
	}

	return header, nil
}

// MakeHeaderYaml takes a yaml spec for a syntax file and parses the
// header