v.fmt: add an independent Comment.is_inline flag. Use it for fixing `[ .. //x ]` => `[ .. //x, ]`

cmd/tools/vast/vast.v

@@ -438,7 +438,7 @@ fn (t Tree) comment(node ast.Comment) &Node {
 	obj.add('ast_type', t.string_node('Comment'))
 	obj.add('text', t.string_node(node.text))
 	obj.add('is_multi', t.bool_node(node.is_multi))
-	obj.add('line_nr', t.number_node(node.line_nr))
+	obj.add('is_inline', t.bool_node(node.is_inline))
 	obj.add('pos', t.position(node.pos))
 	return obj
 }

cmd/tools/vtest-cleancode.v

@@ -44,7 +44,6 @@ const (
 	]
 	vfmt_known_failing_exceptions   = arrays.merge(verify_known_failing_exceptions, [
 		'vlib/strconv/' /* prevent conflicts, till the new pure V string interpolation is merged */,
-		'vlib/net/http/cookie_test.v' /* a very weird bug where `,` keeps on being added in comments */,
 		'vlib/term/ui/input.v' /* comment after a struct embed is removed */,
 		'vlib/regex/regex_test.v' /* contains meaningfull formatting of the test case data */,
 		'vlib/readline/readline_test.v' /* vfmt eats `{ Readline }` from `import readline { Readline }` */,

vlib/net/http/cookie_test.v

@@ -443,7 +443,7 @@ const (
 			},
 			]
 		}
-		// TODO(bradfitz): users have reported seeing this in the,,
+		// TODO(bradfitz): users have reported seeing this in the
 		// wild, but do browsers handle it? RFC 6265 just says "don't
 		// do that" (section 3) and then never mentions header folding
 		// again.

vlib/v/ast/ast.v

@@ -1382,10 +1382,10 @@ pub mut:
 
 pub struct Comment {
 pub:
-	text     string
-	is_multi bool
-	line_nr  int
-	pos      token.Position
+	text      string
+	is_multi  bool // true only for /* comment */, that use many lines
+	is_inline bool // true for all /* comment */ comments
+	pos       token.Position
 }
 
 pub struct ConcatExpr {

vlib/v/fmt/fmt.v

@@ -26,7 +26,7 @@ pub mut:
 	buffering          bool   // disables line wrapping for exprs that will be analyzed later
 	par_level          int    // how many parentheses are put around the current expression
 	array_init_break   []bool // line breaks after elements in hierarchy level of multi dimensional array
-	array_init_depth   int    // current level of hierarchie in array init
+	array_init_depth   int    // current level of hierarchy in array init
 	single_line_if     bool
 	cur_mod            string
 	file               ast.File
@@ -1500,12 +1500,21 @@ pub fn (mut f Fmt) array_init(node ast.ArrayInit) {
 			}
 			f.expr(expr)
 		}
-		if i < node.ecmnts.len && node.ecmnts[i].len > 0 {
+		mut last_comment_was_inline := false
+		mut has_comments := node.ecmnts[i].len > 0
+		if i < node.ecmnts.len && has_comments {
 			expr_pos := expr.position()
-			for cmt in node.ecmnts[i] {
+			for icmt, cmt in node.ecmnts[i] {
 				if !set_comma && cmt.pos.pos > expr_pos.pos + expr_pos.len + 2 {
-					f.write(',')
-					set_comma = true
+					if icmt > 0 {
+						if last_comment_was_inline {
+							f.write(',')
+							set_comma = true
+						}
+					} else {
+						f.write(',') // first comment needs a comma
+						set_comma = true
+					}
 				}
 				if cmt.pos.line_nr > expr_pos.last_line {
 					embed := i + 1 < node.exprs.len
@@ -1516,16 +1525,21 @@ pub fn (mut f Fmt) array_init(node ast.ArrayInit) {
 					f.write(' ')
 					f.comment(cmt, iembed: true)
 				}
+				last_comment_was_inline = cmt.is_inline
 			}
 		}
+		mut put_comma := !set_comma
+		if has_comments && !last_comment_was_inline {
+			put_comma = false
+		}
 		if i == node.exprs.len - 1 {
 			if is_new_line {
-				if !set_comma {
+				if put_comma {
 					f.write(',')
 				}
 				f.writeln('')
 			}
-		} else if !set_comma {
+		} else if put_comma {
 			f.write(',')
 		}
 		last_line_nr = pos.last_line

vlib/v/fmt/tests/array_init_comment_ending_keep.vv

@@ -0,0 +1,23 @@
+import net.http
+
+const (
+	write_set_cookie_tests = [
+		ReadSetCookiesTestCase{
+			header: map{
+				'Set-Cookie': ['special-7=","']
+			}
+			cookies: [
+				&http.Cookie{
+				name: 'special-7'
+				value: ','
+				raw: 'special-8=","'
+			},
+			]
+		}
+		// TODO(bradfitz): users have reported seeing this in the
+		// wild, but do browsers handle it? RFC 6265 just says "don't
+		// do that" (section 3) and then never mentions header folding
+		// again.
+		// Header{"Set-Cookie": ["ASP.NET_SessionId=foo; path=/; HttpOnly, .ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly"]},
+	]
+)

vlib/v/parser/parser.v

@@ -605,17 +605,20 @@ pub fn (mut p Parser) check_comment() ast.Comment {
 pub fn (mut p Parser) comment() ast.Comment {
 	mut pos := p.tok.position()
 	text := p.tok.lit
-	pos.last_line = pos.line_nr + text.count('\n')
+	num_newlines := text.count('\n')
+	is_multi := num_newlines > 0
+	is_inline := text.len + 4 == p.tok.len // 4: `/` `*` `*` `/`
+	pos.last_line = pos.line_nr + num_newlines
 	p.next()
-	is_multi := text.contains('\n')
 	// Filter out false positive space indent vet errors inside comments
 	if p.vet_errors.len > 0 && is_multi {
 		p.vet_errors = p.vet_errors.filter(it.typ != .space_indent
 			|| it.pos.line_nr - 1 > pos.last_line || it.pos.line_nr - 1 <= pos.line_nr)
 	}
 	return ast.Comment{
-		is_multi: is_multi
 		text: text
+		is_multi: is_multi
+		is_inline: is_inline
 		pos: pos
 	}
 }