Struct LogicPath

pub struct LogicPath { /* private fields */ }

Encodes information on how the syntax tree below a given query is structured.

This way it is possible to optimize queries on the condition of a specific tree structure.

An example would be turning a subquery into a JOIN or IN given a plain AND or OR structure.

This struct itself is not mutable, it can only generate copies of itself with the given operation appended through the and, or and not methods.

Implementations

impl LogicPath

pub fn new_root() -> Self

Creates a new root for a logic path

pub fn depth(&self) -> usize

Returns the depth/length of the path, starts at 0.

pub fn is_root(&self) -> bool

Returns wheter this struct represents the root node of a logic path

pub fn is_plain_and(&self) -> bool

Wheter the logic path is made up of only AND connections without any inversions.

pub fn is_plain_or(&self) -> bool

Wheter the logic_path is made up of only OR connections without any inversions.

pub fn is_excluding(&self) -> bool

Returns the parity of all inversions so far and returns true for an uneven amount of inversions.

This can be used to determine wheter a match of the query could include or exclude an item.

pub fn is_branch_inverted(&self) -> bool

Returns wheter there has been an uneven amount of inversions since the last AND or OR statement.

pub fn and(&self) -> Self

Return the path with an AND connection appended.

pub fn or(&self) -> Self

Return the path with an OR connection appended.

pub fn not(&self) -> Self

Return the path with an inversion appended.

Trait Implementations

impl Clone for LogicPath

fn clone(&self) -> LogicPath

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LogicPath

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.