Trait mz_lowertest::TestDeserializeContext

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>;
}

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

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.

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.

Object Safety

This trait is not object safe.

Implementors

impl TestDeserializeContext for GenericTestDeserializeContext