Trait Context 

pub trait Context {
    // Required methods
    fn add_simple_extension_urn(
        &mut self,
        simple_extension_urn: &SimpleExtensionUrn,
    ) -> Result<&SimpleExtensions, ContextError>;
    fn simple_extensions(
        &self,
        anchor: &Anchor<SimpleExtensionUrn>,
    ) -> Result<&SimpleExtensions, ContextError>;

    // Provided method
    fn parse<T: Parse<Self>>(&mut self, item: T) -> Result<T::Parsed, T::Error>
       where Self: Sized { ... }
}

Available on crate feature parse only.

A parse context.

Parsing Substrait data is context-sensitive. This trait provides methods that can be used by parser implementations to parse Substrait data.

Required Methods

fn add_simple_extension_urn( &mut self, simple_extension_urn: &SimpleExtensionUrn, ) -> Result<&SimpleExtensions, ContextError>

Add a SimpleExtensionUrn to this context. Must return an error for duplicate anchors or when the urn is not supported.

This function must eagerly resolve and parse the simple extension, returning an error if either fails.

fn simple_extensions( &self, anchor: &Anchor<SimpleExtensionUrn>, ) -> Result<&SimpleExtensions, ContextError>

Returns the simple extensions for the given simple extension anchor.

Provided Methods

fn parse<T: Parse<Self>>(&mut self, item: T) -> Result<T::Parsed, T::Error>

where Self: Sized,

Parse an item with this context.

See Parse::parse.

Implementors