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#### 22.7.1.7 Helper Functions for Indentation Rules

SMIE provides various functions designed specifically for use in the indentation rules function (several of those functions break if used in another context). These functions all start with the prefix `smie-rule-`.

Function: smie-rule-bolp

  Return non-`nil` if the current token is the first on the line.

Function: smie-rule-hanging-p

  Return non-`nil` if the current token is hanging. A token is hanging if it is the last token on the line and if it is preceded by other tokens: a lone token on a line is not hanging.

Function: smie-rule-next-p &rest tokens

  Return non-`nil` if the next token is among tokens.

Function: smie-rule-prev-p &rest tokens

  Return non-`nil` if the previous token is among tokens.

Function: smie-rule-parent-p &rest parents

  Return non-`nil` if the current token’s parent is among parents.

Function: smie-rule-sibling-p

  Return non-`nil` if the current token’s parent is actually a sibling. This is the case for example when the parent of a `","` is just the previous `","`.

Function: smie-rule-parent &optional offset

  Return the proper offset to align the current token with the parent. If non-`nil`, offset should be an integer giving an additional offset to apply.

Function: smie-rule-separator method

  Indent current token as a separator.

  By separator, we mean here a token whose sole purpose is to separate various elements within some enclosing syntactic construct, and which does not have any semantic significance in itself (i.e., it would typically not exist as a node in an abstract syntax tree).

  Such a token is expected to have an associative syntax and be closely tied to its syntactic parent. Typical examples are `","` in lists of arguments (enclosed inside parentheses), or `";"` in sequences of instructions (enclosed in a `{...}` or `begin...end` block).

  method should be the method name that was passed to `smie-rules-function`.

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