+
+ else if (contains(str, "\\documentclass") ||
+ contains(str, "\\chapter") ||
+ contains(str, "\\section") ||
+ contains(str, "\\begin") ||
+ contains(str, "\\end") ||
+ contains(str, "$$") ||
+ contains(str, "\\[") ||
+ contains(str, "\\]"))
+ format = "latex";
+ else {
+ if (contains(str, '\\'))
+ backslash = true;
+ dollars += count_char(str, '$');
+ }