scanner: fix scanning empty inline comment

scanner/scanner.go

@@ -8358,12 +8358,11 @@ yyrule127: // ([/][*])|([/][*][*])
 			if c == -1 {
 				break // TODO: Unterminated comment starting line %d
 			}
-			p := c
-			c = l.Next()
-			if rune(p) == '*' && rune(c) == '/' {
+			if l.Prev.Rune == '*' && l.Last.Rune == '/' {
 				c = l.Next()
 				break
 			}
+			c = l.Next()
 		}
 		lval.Token(l.newToken(l.Token()))
 		if is_doc_comment {

scanner/scanner.l

@@ -307,13 +307,12 @@ NEW_LINE        (\r|\n|\r\n)
             break; // TODO: Unterminated comment starting line %d
         }
 
-        p := c
-        c = l.Next()
-
-        if rune(p) == '*' && rune(c) == '/' {
+        if l.Prev.Rune == '*' && l.Last.Rune == '/' {
             c = l.Next()
             break;
         }
+
+        c = l.Next()
     }
 
     lval.Token(l.newToken(l.Token()))

scanner/scanner_test.go

@@ -955,3 +955,57 @@ func TestCommentWithPhpEndTag(t *testing.T) {
 
 	assertEqual(t, expected, actual)
 }
+
+func TestInlineComment(t *testing.T) {
+	src := `<?php
+	/*test*/`
+
+	expected := []comment.Comment{
+		comment.NewPlainComment("/*test*/"),
+	}
+
+	lexer := scanner.NewLexer(bytes.NewBufferString(src), "test.php")
+	lv := &lval{}
+
+	lexer.Lex(lv)
+
+	actual := lexer.Comments
+
+	assertEqual(t, expected, actual)
+}
+
+func TestEmptyInlineComment(t *testing.T) {
+	src := `<?php
+	/**/`
+
+	expected := []comment.Comment{
+		comment.NewDocComment("/**/"),
+	}
+
+	lexer := scanner.NewLexer(bytes.NewBufferString(src), "test.php")
+	lv := &lval{}
+
+	lexer.Lex(lv)
+
+	actual := lexer.Comments
+
+	assertEqual(t, expected, actual)
+}
+
+func TestEmptyInlineComment2(t *testing.T) {
+	src := `<?php
+	/***/`
+
+	expected := []comment.Comment{
+		comment.NewDocComment("/***/"),
+	}
+
+	lexer := scanner.NewLexer(bytes.NewBufferString(src), "test.php")
+	lv := &lval{}
+
+	lexer.Lex(lv)
+
+	actual := lexer.Comments
+
+	assertEqual(t, expected, actual)
+}