// 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
}
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)))
}
}
}