mz_lowertest

Trait TestDeserializeContext

Source 
pub trait TestDeserializeContext {
    // Required methods
    fn override_syntax<I>(
        &mut self,
        first_arg: TokenTree,
        rest_of_stream: &mut I,
        type_name: &str,
    ) -> Result<Option<String>, String>
       where I: Iterator<Item = TokenTree>;
    fn reverse_syntax_override(
        &mut self,
        json: &Value,
        type_name: &str,
    ) -> Option<String>;
}
Expand description

A trait for extending and/or overriding the default test case syntax.

Note when creating an implementation of this trait that the [proc_macro2::TokenStream] considers:

  • null/true/false to be Idents
  • strings and positive numeric values (like 1 or 1.1) to be Literals.
  • negative numeric values to be a Punct('-') followed by a Literal.

Required Methods§

Source

fn override_syntax<I>( &mut self, first_arg: TokenTree, rest_of_stream: &mut I, type_name: &str, ) -> Result<Option<String>, String>
where I: Iterator<Item = TokenTree>,

Override the way that first_arg is resolved to JSON.

first_arg is the first TokenTree of the TokenStream. rest_of_stream contains a reference to the rest of the stream.

Returns Ok(Some(value)) if first_arg has been resolved. Returns Ok(None) if first_arg should be resolved using the default syntax. If returning Ok(None), the function implementation promises not to advance rest_of_stream.

Source

fn reverse_syntax_override( &mut self, json: &Value, type_name: &str, ) -> Option<String>

Converts json back to the extended syntax specified by TestDeserializeContext::override_syntax.

Returns Some(value) if json has been resolved. Returns None is json should be resolved in the default manner.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§