Struct wit_parser::Resolve

pub struct Resolve {
    pub worlds: Arena<World>,
    pub interfaces: Arena<Interface>,
    pub types: Arena<TypeDef>,
    pub packages: Arena<Package>,
    pub package_names: IndexMap<PackageName, PackageId>,
}

Representation of a fully resolved set of WIT packages.

This structure contains a graph of WIT packages and all of their contents merged together into the contained arenas. All items are sorted topologically and everything here is fully resolved, so with a Resolve no name lookups are necessary and instead everything is index-based.

Working with a WIT package requires inserting it into a Resolve to ensure that all of its dependencies are satisfied. This will give the full picture of that package’s types and such.

Each item in a Resolve has a parent link to trace it back to the original package as necessary.

Fields

worlds: Arena<World>

All knowns worlds within this Resolve.

Each world points at a PackageId which is stored below. No ordering is guaranteed between this list of worlds.

interfaces: Arena<Interface>

All knowns interfaces within this Resolve.

Each interface points at a PackageId which is stored below. No ordering is guaranteed between this list of interfaces.

types: Arena<TypeDef>

All knowns types within this Resolve.

Types are topologically sorted such that any type referenced from one type is guaranteed to be defined previously. Otherwise though these are not sorted by interface for example.

packages: Arena<Package>

All knowns packages within this Resolve.

This list of packages is not sorted. Sorted packages can be queried through Resolve::topological_packages.

package_names: IndexMap<PackageName, PackageId>

A map of package names to the ID of the package with that name.

Implementations

impl Resolve

pub fn wasm_signature( &self, variant: AbiVariant, func: &Function ) -> WasmSignature

Get the WebAssembly type signature for this interface function

The first entry returned is the list of parameters and the second entry is the list of results for the wasm function signature.

pub fn push_flat(&self, ty: &Type, result: &mut Vec<WasmType>)

Appends the flat wasm types representing ty onto the result list provided.

impl Resolve

pub fn new() -> Resolve

Creates a new Resolve with no packages/items inside of it.

pub fn push_path( &mut self, path: impl AsRef<Path> ) -> Result<(PackageId, Vec<PathBuf>)>

Parse a WIT package from the input path.

The input path can be one of:

• A directory containing a WIT package with an optional deps directory for any dependent WIT packages it references.
• A single standalone WIT file depending on what’s already in Resolve.
• A wasm-encoded WIT package as a single file in the wasm binary format.
• A wasm-encoded WIT package as a single file in the wasm text format.

The PackageId of the parsed package is returned. For more information see Resolve::push_dir and Resolve::push_file. This method will automatically call the appropriate method based on what kind of filesystem entry path is.

Returns the top-level PackageId as well as a list of all files read during this parse.

pub fn push_dir(&mut self, path: &Path) -> Result<(PackageId, Vec<PathBuf>)>

Parses the filesystem directory at path as a WIT package and returns the fully resolved PackageId as a result.

The directory itself is parsed with UnresolvedPackage::parse_dir which has more information on the layout of the directory. This method, however, additionally supports an optional deps dir where dependencies can be located.

All entries in the deps directory are inspected and parsed as follows:

• Any directories inside of deps are assumed to be another WIT package and are parsed with UnresolvedPackage::parse_dir.
• WIT files (*.wit) are parsed with UnresolvedPackage::parse_file.
• WebAssembly files (*.wasm or *.wat) are assumed to be WIT packages encoded to wasm and are parsed and inserted into self.

This function returns the PackageId of the root parsed package at path, along with a list of all paths that were consumed during parsing for the root package and all dependency packages.

pub fn push_file(&mut self, path: impl AsRef<Path>) -> Result<PackageId>

Parses the contents of path from the filesystem and pushes the result into this Resolve.

The path referenced here can be one of:

• A WIT file. Note that in this case this single WIT file will be the entire package and any dependencies it has must already be in self.
• A WIT package encoded as WebAssembly, either in text or binary form. In this the package and all of its dependencies are automatically inserted into self.

In both situations the PackageId of the resulting resolved package is returned from this method.

pub fn push(&mut self, unresolved: UnresolvedPackage) -> Result<PackageId>

Appends a new UnresolvedPackage to this Resolve, creating a fully resolved package with no dangling references.

The deps argument indicates that the named dependencies in unresolved to packages are resolved by the mapping specified.

Any dependency resolution error or otherwise world-elaboration error will be returned here. If successful a package identifier is returned.

pub fn all_bits_valid(&self, ty: &Type) -> bool

pub fn merge(&mut self, resolve: Resolve) -> Result<Remap>

Merges all the contents of a different Resolve into this one. The Remap structure returned provides a mapping from all old indices to new indices

This operation can fail if resolve disagrees with self about the packages being inserted. Otherwise though this will additionally attempt to “union” packages found in resolve with those found in self. Unioning packages is keyed on the name/url of packages for those with URLs present. If found then it’s assumed that both Resolve instances were originally created from the same contents and are two views of the same package.

pub fn merge_worlds(&mut self, from: WorldId, into: WorldId) -> Result<()>

Merges the world from into the world into.

This will attempt to merge one world into another, unioning all of its imports and exports together. This is an operation performed by wit-component, for example where two different worlds from two different libraries were linked into the same core wasm file and are producing a singular world that will be the final component’s interface.

This operation can fail if the imports/exports overlap.

pub fn id_of(&self, interface: InterfaceId) -> Option<String>

Returns the ID of the specified interface.

Returns None for unnamed interfaces.

pub fn id_of_name(&self, pkg: PackageId, name: &str) -> String

Returns the ID of the specified name within the pkg.

pub fn select_world( &self, pkg: PackageId, world: Option<&str> ) -> Result<WorldId>

Attempts to locate a world given the “default” package pkg and the optional string specifier world.

This method is intended to be used by bindings generation tools to select a world from either pkg or a package in this Resolve.

If world is None then pkg must have precisely one world which will be returned.

If world is Some then it can either be:

• A kebab-name of a world contained within pkg which is being selected, such as "the-world".

• An ID-based form of a world which is selected within this Resolve, ignoring pkg. For example "wasi:http/proxy".

If successful the corresponding WorldId is returned, otherwise an error is returned.

pub fn name_world_key(&self, key: &WorldKey) -> String

Assigns a human readable name to the WorldKey specified.

pub fn type_interface_dep(&self, id: TypeId) -> Option<InterfaceId>

Returns the interface that id uses a type from, if it uses a type from a different interface than id is defined within.

If id is not a use-of-a-type or it’s using a type in the same interface then None is returned.

pub fn interface_direct_deps( &self, id: InterfaceId ) -> impl Iterator<Item = InterfaceId> + '_

Returns an iterator of all interfaces that the interface id depends on.

Interfaces may depend on others for type information to resolve type imports.

Note that the returned iterator may yield the same interface as a dependency multiple times. Additionally only direct dependencies of id are yielded, not transitive dependencies.

pub fn package_direct_deps( &self, id: PackageId ) -> impl Iterator<Item = PackageId> + '_

Returns an iterator of all packages that the package id depends on.

Packages may depend on others for type information to resolve type imports or interfaces to resolve worlds.

Note that the returned iterator may yield the same package as a dependency multiple times. Additionally only direct dependencies of id are yielded, not transitive dependencies.

pub fn topological_packages(&self) -> Vec<PackageId>

Returns a topological ordering of packages contained in this Resolve.

This returns a list of PackageId such that when visited in order it’s guaranteed that all dependencies will have been defined by prior items in the list.

Trait Implementations

impl Clone for Resolve

fn clone(&self) -> Resolve

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Resolve

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

Formats the value using the given formatter.

impl Default for Resolve

fn default() -> Resolve

Returns the “default value” for a type.

impl Serialize for Resolve

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.