Struct mz_expr_test_util::MirScalarExprDeserializeContext

pub struct MirScalarExprDeserializeContext;

Extends the test case syntax to support MirScalarExprs

The following variants of MirScalarExpr have non-standard syntax: Literal -> the syntax is (ok <literal> <scalar type>), <literal> or (err <eval error> <scalar type>). Note that ok token can be omitted. If <scalar type> is not specified, then literals will be assigned default types:

• true/false become Bool
• numbers become Int64
• strings become String
• Bool for literal errors Column -> the syntax is #n, where n is the column number.

Implementations

impl MirScalarExprDeserializeContext

pub(crate) fn build_column( &self, token: Option<TokenTree>, ) -> Result<MirScalarExpr, String>

pub(crate) fn build_literal_if_able<I>( &self, first_arg: TokenTree, rest_of_stream: &mut I, ) -> Result<Option<MirScalarExpr>, String>

where I: Iterator<Item = TokenTree>,

pub(crate) fn build_literal_ok_if_able<I>( &self, first_arg: TokenTree, rest_of_stream: &mut I, ) -> Result<Option<MirScalarExpr>, String>

where I: Iterator<Item = TokenTree>,

Trait Implementations

impl Default for MirScalarExprDeserializeContext

fn default() -> MirScalarExprDeserializeContext

Returns the “default value” for a type.

impl TestDeserializeContext for MirScalarExprDeserializeContext

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.

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.