JS

{@inheritdoc}

Overrides

Minify the data. Perform JS optimizations.

Strip comments from source code.

JS can have /-delimited regular expressions, like: /ab+c/.match(string). The content inside the regex can contain characters that may be confused for JS code: e.g. it could contain whitespace it needs to match & we don't want to strip whitespace in there. The regex can be pretty simple: we don't have to care about comments, (which also use slashes) because stripComments() will have stripped those already. This method will replace all string content with simple REGEX# placeholder text, so we've rid all regular expressions from characters that may be misinterpreted. Original regex content will be saved in $this->extracted and after doing all other minifying, we can restore the original content via restoreRegex()

Strip whitespace. We won't strip *all* whitespace, but as much as possible. The thing that we'll preserve are newlines we're unsure about. JavaScript doesn't require statements to be terminated with a semicolon. It will automatically fix missing semicolons with ASI (automatic semi- colon insertion) at the end of line causing errors (without semicolon.) Because it's sometimes hard to tell if a newline is part of a statement that should be terminated or not, we'll just leave some of them alone.

We'll strip whitespace around certain operators with regular expressions. This will prepare the given array by escaping all characters.

We'll strip whitespace around certain keywords with regular expressions. This will prepare the given array by escaping all characters.

Replaces all occurrences of array['key'] by array.key.

Replaces true & false by !0 and !1.