Method startComment

expfmt/text_parse.go:167–224

startComment represents the state where the next byte read from p.buf is the start of a comment (or whitespace leading up to it).

()

// startComment represents the state where the next byte read from p.buf is the
// start of a comment (or whitespace leading up to it).
func (p *TextParser) startComment() stateFn {
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.currentByte == '\n' {
		return p.startOfLine
	}
	if p.readTokenUntilWhitespace(); p.err != nil {
		return nil // Unexpected end of input.
	}
	// If we have hit the end of line already, there is nothing left
	// to do. This is not considered a syntax error.
	if p.currentByte == '\n' {
		return p.startOfLine
	}
	keyword := p.currentToken.String()
	if keyword != "HELP" && keyword != "TYPE" {
		// Generic comment, ignore by fast forwarding to end of line.
		for p.currentByte != '\n' {
			if p.currentByte, p.err = p.buf.ReadByte(); p.err != nil {
				return nil // Unexpected end of input.
			}
		}
		return p.startOfLine
	}
	// There is something. Next has to be a metric name.
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.readTokenAsMetricName(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.currentByte == '\n' {
		// At the end of the line already.
		// Again, this is not considered a syntax error.
		return p.startOfLine
	}
	if !isBlankOrTab(p.currentByte) {
		p.parseError("invalid metric name in comment")
		return nil
	}
	p.setOrCreateCurrentMF()
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.currentByte == '\n' {
		// At the end of the line already.
		// Again, this is not considered a syntax error.
		return p.startOfLine
	}
	switch keyword {
	case "HELP":
		return p.readingHelp
	case "TYPE":
		return p.readingType
	}
	panic(fmt.Sprintf("code error: unexpected keyword %q", keyword))
}