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#### 5.6.4.2 Examining Package/Class Options

In LaTeX documents, style hooks can find the package names and those options given as optional argument(s) of ‘\usepackage’ in `LaTeX-provided-package-options`.

Variable: LaTeX-provided-package-options

Buffer local variable holding alist of options provided to LaTeX packages. Each element is a cons cell ```(package . option-list)```. For example, its value will be

 ``` (("babel" . ("german")) ("geometry" . ("a4paper" "top=2cm" "left=2.5cm" "right=2.5cm")) ...) ```

You can examine whether there is a specific package-option pair by `LaTeX-provided-package-options-member`.

Function: LaTeX-provided-package-options-member package option

Return non-`nil` if option has been given to package. The value is actually the tail of the list of options given to package.

There are similar facilities for class names and those options given in `\documentclass` declaration.

Variable: LaTeX-provided-class-options

Buffer local variable holding alist of options provided to LaTeX classes. Each element is a cons cell ```(class . option-list)```. For example, its value will be

 ``` (("book" . ("a4paper" "11pt" "openany" "fleqn")) ...) ```
Function: LaTeX-provided-class-options-member class option

Return non-`nil` if option has been given to class. The value is actually the tail of the list of options given to class.

Function: LaTeX-match-class-option regexp

Check if a documentclass option matching regexp is active. Return first found class option matching regexp, or nil if not found.

These functions are also useful to implement customized predicate(s) in `TeX-view-predicate-list`. See Starting Viewers.

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