Ejemplo n.º 1
0
// intersperseComments consumes all comments that appear before the next token
// tok and prints it together with the buffered whitespace (i.e., the whitespace
// that needs to be written before the next token). A heuristic is used to mix
// the comments and whitespace. intersperseComments returns true if a pending
// formfeed was dropped from the whitespace buffer.
//
func (p *printer) intersperseComments(next token.Position, tok token.Token) (droppedFF bool) {
	var last *ast.Comment
	for ; p.commentBefore(next); p.cindex++ {
		for _, c := range p.comments[p.cindex].List {
			p.writeCommentPrefix(p.fset.Position(c.Pos()), next, last, tok.IsKeyword())
			p.writeComment(c)
			last = c
		}
	}

	if last != nil {
		if last.Text[1] == '*' && p.fset.Position(last.Pos()).Line == next.Line {
			// the last comment is a /*-style comment and the next item
			// follows on the same line: separate with an extra blank
			p.write([]byte{' '})
		}
		// ensure that there is a line break after a //-style comment,
		// before a closing '}' unless explicitly disabled, or at eof
		needsLinebreak :=
			last.Text[1] == '/' ||
				tok == token.RBRACE && p.mode&noExtraLinebreak == 0 ||
				tok == token.EOF
		return p.writeCommentSuffix(needsLinebreak)
	}

	// no comment was written - we should never reach here since
	// intersperseComments should not be called in that case
	p.internalError("intersperseComments called without pending comments")
	return false
}
Ejemplo n.º 2
0
func (p *printer) writeComment(comment *ast.Comment) {
	text := comment.Text

	// shortcut common case of //-style comments
	if text[1] == '/' {
		p.writeItem(p.fset.Position(comment.Pos()), p.escape(text))
		return
	}

	// for /*-style comments, print line by line and let the
	// write function take care of the proper indentation
	lines := split([]byte(text))
	stripCommonPrefix(lines)

	// write comment lines, separated by formfeed,
	// without a line break after the last line
	linebreak := formfeeds[0:1]
	pos := p.fset.Position(comment.Pos())
	for i, line := range lines {
		if i > 0 {
			p.write(linebreak)
			pos = p.pos
		}
		if len(line) > 0 {
			p.writeItem(pos, p.escape(string(line)))
		}
	}
}