Struct TaprootBuilder

pub struct TaprootBuilder { /* private fields */ }

Builder for building taproot iteratively. Users can specify tap leaf or omitted/hidden branches in a depth-first search (DFS) walk order to construct this tree.

See Wikipedia for more details on DFS.

Implementations

impl TaprootBuilder

pub fn new() -> TaprootBuilder

Creates a new instance of TaprootBuilder.

pub fn with_capacity(size: usize) -> TaprootBuilder

Creates a new instance of TaprootBuilder with a capacity hint for size elements.

The size here should be maximum depth of the tree.

pub fn with_huffman_tree<I>( script_weights: I, ) -> Result<TaprootBuilder, TaprootBuilderError>

where I: IntoIterator<Item = (u32, ScriptBuf)>,

Creates a new TaprootSpendInfo from a list of scripts (with default script version) and weights of satisfaction for that script.

The weights represent the probability of each branch being taken. If probabilities/weights for each condition are known, constructing the tree as a Huffman Tree is the optimal way to minimize average case satisfaction cost. This function takes as input an iterator of tuple(u32, ScriptBuf) where u32 represents the satisfaction weights of the branch. For example, [(3, S1), (2, S2), (5, S3)] would construct a TapTree that has optimal satisfaction weight when probability for S1 is 30%, S2 is 20% and S3 is 50%.

Errors:

• When the optimal Huffman Tree has a depth more than 128.
• If the provided list of script weights is empty.

Edge Cases:

If the script weight calculations overflow, a sub-optimal tree may be generated. This should not happen unless you are dealing with billions of branches with weights close to 2^32.

pub fn add_leaf_with_ver( self, depth: u8, script: ScriptBuf, ver: LeafVersion, ) -> Result<TaprootBuilder, TaprootBuilderError>

Adds a leaf script at depth to the builder with script version ver. Errors if the leaves are not provided in DFS walk order. The depth of the root node is 0.

pub fn add_leaf( self, depth: u8, script: ScriptBuf, ) -> Result<TaprootBuilder, TaprootBuilderError>

Adds a leaf script at depth to the builder with default script version. Errors if the leaves are not provided in DFS walk order. The depth of the root node is 0.

See TaprootBuilder::add_leaf_with_ver for adding a leaf with specific version.

pub fn add_hidden_node( self, depth: u8, hash: TapNodeHash, ) -> Result<TaprootBuilder, TaprootBuilderError>

Adds a hidden/omitted node at depth to the builder. Errors if the leaves are not provided in DFS walk order. The depth of the root node is 0.

pub fn is_finalizable(&self) -> bool

Checks if the builder has finalized building a tree.

pub fn try_into_node_info(self) -> Result<NodeInfo, IncompleteBuilderError>

Converts the builder into a NodeInfo if the builder is a full tree with possibly hidden nodes

Errors:

IncompleteBuilderError::NotFinalized if the builder is not finalized. The builder can be restored by calling IncompleteBuilderError::into_builder

pub fn try_into_taptree(self) -> Result<TapTree, IncompleteBuilderError>

Converts the builder into a TapTree if the builder is a full tree and does not contain any hidden nodes

pub fn has_hidden_nodes(&self) -> bool

Checks if the builder has hidden nodes.

pub fn finalize<C>( self, secp: &Secp256k1<C>, internal_key: XOnlyPublicKey, ) -> Result<TaprootSpendInfo, TaprootBuilder>

where C: Verification,

Creates a TaprootSpendInfo with the given internal key.

Returns the unmodified builder as Err if the builder is not finalizable. See also TaprootBuilder::is_finalizable

Trait Implementations

impl Clone for TaprootBuilder

fn clone(&self) -> TaprootBuilder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TaprootBuilder

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

Formats the value using the given formatter.

impl Default for TaprootBuilder

fn default() -> TaprootBuilder

Returns the “default value” for a type.

impl Hash for TaprootBuilder

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for TaprootBuilder

fn cmp(&self, other: &TaprootBuilder) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for TaprootBuilder

fn eq(&self, other: &TaprootBuilder) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for TaprootBuilder

fn partial_cmp(&self, other: &TaprootBuilder) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl TryFrom<TaprootBuilder> for NodeInfo

type Error = IncompleteBuilderError

The type returned in the event of a conversion error.

fn try_from( builder: TaprootBuilder, ) -> Result<NodeInfo, <NodeInfo as TryFrom<TaprootBuilder>>::Error>

Performs the conversion.

impl TryFrom<TaprootBuilder> for TapTree

fn try_from( builder: TaprootBuilder, ) -> Result<TapTree, <TapTree as TryFrom<TaprootBuilder>>::Error>

Constructs TapTree from a TaprootBuilder if it is complete binary tree.

Returns

A TapTree iff the builder is complete, otherwise return IncompleteBuilderError error with the content of incomplete builder instance.

type Error = IncompleteBuilderError

The type returned in the event of a conversion error.

impl Eq for TaprootBuilder

impl StructuralPartialEq for TaprootBuilder