Module ast 

Syntax tree for Bern declarations. Spans are kept so diagnostics from both the macros and the build tool point at the developer’s source.

Structs

Action

receiver.member.method(args): an action after =>, or the query call of a query: property.

ComponentCall

A reference to a declared Bern component with named arguments.

Element

A built-in component such as Button(...) { ... } => action.

IfLetNode

if let Some(name) = expr { … } else { … }

IfNode

MatchArm

MatchNode

PathExpr

a, a.b or a.b.c. Roots are component parameters or template variables; a lone identifier may also be a keyword such as segmented.

Prop

Tr

tr! { "zh-Hans" => "…{count}…", "en" => "…"; count: app.count }

TrArg

An interpolation argument after the ; in tr!.

TrEntry

One translation inside tr!.

UiBody

The contents of one ui! invocation.

VariantExpr

Type::Variant or Type::Variant { field: expr }.

Enums

BinaryOp

Expr

Restricted expressions: literals, translations, typed bindings, enum values and a fixed set of operators. Arbitrary function calls do not exist in this grammar.

Literal

Node

Pattern

TypeRef

Bern’s view of a Rust type used in declarations.

UnaryOp

Functions

child_names

The element names among children, None for anything else. With items, for navigation containers, the elements in each branch of a condition or match and in each ForEach template count instead.