scanner: fix parsing multiple .amp

vlib/v/fmt/fmt.v

@@ -505,7 +505,8 @@ pub fn (mut f Fmt) struct_field_expr(fexpr ast.Expr) {
 
 fn (f &Fmt) type_to_str(t table.Type) string {
 	mut res := f.table.type_to_str(t)
-	if res.ends_with('_ptr') {
+
+	for res.ends_with('_ptr') {
 		// type_ptr => &type
 		res = res[0..res.len - 4]
 		start_pos := 2 * res.count('[]')

vlib/v/fmt/tests/type_ptr_keep.vv

@@ -2,12 +2,18 @@ const (
 	x  = &Test{}
 	y  = []&Test{}
 	z  = &[]&Test{}
+	xx = &&Test{}
+	yy = []&&Test{}
+	zz = &&[]&&Test{}
 )
 
 fn test_type_ptr() {
 	_ := &Test{}
 	_ := []&Test{}
 	_ := &[]&Test{}
+	_ := &&Test{}
+	_ := []&&Test{}
+	_ := &&[]&&Test{}
 }
 
 struct Test {

vlib/v/parser/fn.v

@@ -361,7 +361,7 @@ fn (mut p Parser) fn_args() ([]table.Arg, bool) {
 	mut args := []table.Arg{}
 	mut is_variadic := false
 	// `int, int, string` (no names, just types)
-	types_only := p.tok.kind in [.amp, .and, .ellipsis] || (p.peek_tok.kind == .comma && p.table.known_type(p.tok.lit)) ||
+	types_only := p.tok.kind in [.amp, .ellipsis] || (p.peek_tok.kind == .comma && p.table.known_type(p.tok.lit)) ||
 		p.peek_tok.kind == .rpar
 	// TODO copy pasta, merge 2 branches
 	if types_only {

vlib/v/parser/parse_type.v

@@ -111,12 +111,8 @@ pub fn (mut p Parser) parse_type() table.Type {
 		p.next()
 	}
 	// &Type
-	for p.tok.kind in [.and, .amp] {
-		if p.tok.kind == .and {
-			nr_muls += 2
-		} else {
+	for p.tok.kind == .amp {
 		nr_muls++
-		}
 		p.next()
 	}
 

vlib/v/scanner/scanner.v

@@ -641,6 +641,15 @@ pub fn (mut s Scanner) buffer_scan() token.Token {
 	}
 }
 
+[inline]
+fn (s Scanner) look_ahead(n int) byte {
+	if s.pos + n < s.text.len {
+		return s.text[s.pos + n]
+	} else {
+		return `\0`
+	}
+}
+
 fn (mut s Scanner) text_scan() token.Token {
 	// if s.comments_mode == .parse_comments {
 	// println('\nscan()')
@@ -676,14 +685,14 @@ fn (mut s Scanner) text_scan() token.Token {
 	}
 	// handle each char
 	c := s.text[s.pos]
-	nextc := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
+	nextc := s.look_ahead(1)
 
 	// name or keyword
 	if util.is_name_char(c) {
 		name := s.ident_name()
 		// tmp hack to detect . in ${}
 		// Check if not .eof to prevent panic
-		next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
+		next_char := s.look_ahead(1)
 		kind := token.keywords[name]
 		if kind != .unknown {
 			if kind == .key_fn {
@@ -738,7 +747,7 @@ fn (mut s Scanner) text_scan() token.Token {
 	if c == `)` && s.is_inter_start {
 		s.is_inter_end = true
 		s.is_inter_start = false
-		next_char := if s.pos + 1 < s.text.len { s.text[s.pos + 1] } else { `\0` }
+		next_char := s.look_ahead(1)
 		if next_char == s.quote {
 			s.is_inside_string = false
 		}
@@ -849,7 +858,9 @@ fn (mut s Scanner) text_scan() token.Token {
 				s.pos++
 				return s.new_token(.and_assign, '', 2)
 			}
-			if nextc == `&` {
+
+			afternextc := s.look_ahead(2)
+			if nextc == `&` && afternextc.is_space() {
 				s.pos++
 				return s.new_token(.and, '', 2)
 			}

vlib/v/scanner/scanner_test.v

@@ -44,8 +44,7 @@ fn fn_name_mod_level_high_order(cb fn(int)) {
 	cb(1)
 }
 
-fn test_scan() {
-	text := 'println(2 + 3)'
+fn scan_kinds(text string) []token.Kind {
 	mut scanner := new_scanner(text, .skip_comments)
 	mut token_kinds := []token.Kind{}
 	for {
@@ -55,6 +54,11 @@ fn test_scan() {
 		}
 		token_kinds << tok.kind
 	}
+	return token_kinds
+}
+
+fn test_scan() {
+	token_kinds := scan_kinds('println(2 + 3)')
 	assert token_kinds.len == 6
 	assert token_kinds[0] == .name
 	assert token_kinds[1] == .lpar
@@ -122,3 +126,55 @@ fn test_vmod_file() {
 	assert content.contains('version:')
 	assert content.contains('description:')
 }
+
+fn test_reference() {
+	mut result := scan_kinds('true && false')
+	assert result.len == 3
+	assert result[0] == .key_true
+	assert result[1] == .and
+	assert result[2] == .key_false
+
+	result = scan_kinds('&foo')
+	assert result.len == 2
+	assert result[0] == .amp
+	assert result[1] == .name
+
+	result = scan_kinds('[]&foo')
+	assert result.len == 4
+	assert result[0] == .lsbr
+	assert result[1] == .rsbr
+	assert result[2] == .amp
+	assert result[3] == .name
+
+	result = scan_kinds('&[]&foo')
+	assert result.len == 5
+	assert result[0] == .amp
+	assert result[1] == .lsbr
+	assert result[2] == .rsbr
+	assert result[3] == .amp
+	assert result[4] == .name
+
+	result = scan_kinds('&&foo')
+	assert result.len == 3
+	assert result[0] == .amp
+	assert result[1] == .amp
+	assert result[2] == .name
+
+	result = scan_kinds('[]&&foo')
+	assert result.len == 5
+	assert result[0] == .lsbr
+	assert result[1] == .rsbr
+	assert result[2] == .amp
+	assert result[3] == .amp
+	assert result[4] == .name
+
+	result = scan_kinds('&&[]&&foo')
+	assert result.len == 7
+	assert result[0] == .amp
+	assert result[1] == .amp
+	assert result[2] == .lsbr
+	assert result[3] == .rsbr
+	assert result[4] == .amp
+	assert result[5] == .amp
+	assert result[6] == .name
+}

vlib/v/table/table.v

@@ -274,7 +274,7 @@ pub fn (t &Table) known_type(name string) bool {
 pub fn (t &Table) array_name(elem_type Type, nr_dims int) string {
 	elem_type_sym := t.get_type_symbol(elem_type)
 	return 'array_${elem_type_sym.name}' + if elem_type.is_ptr() {
-		'_ptr'
+		'_ptr'.repeat(elem_type.nr_muls())
 	} else {
 		''
 	} + if nr_dims > 1 {

vlib/v/tests/double_ref_deref_test.v

@@ -0,0 +1,10 @@
+fn process(foo &&int) int {
+	return **foo
+}
+
+fn test_ref_deref() {
+	foo := 12
+	bar := &foo
+	fiz := process(&bar)
+	assert fiz == 12
+}