mizchi/luna/core - mooncakes.io

README
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AsyncState
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Attr
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ComponentRef
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Context
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EffectRunner
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EventHandler
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MatchCase
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Node
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Owner
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Resource
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Signal
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Trigger
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TriggerType
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VAsync
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VElement
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VErrorBoundary
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VInternalRef
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VIsland
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VSwitch
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VWcIsland
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action
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all
V
any
V
async_
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attr_dynamic
V
attr_dynamic_style
V
attr_handler
V
attr_static
V
attr_style
V
batch
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batch_end
V
batch_start
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combine2
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combine3
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combine4
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component
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component_ref
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computed
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create_context
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create_root
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create_root_with_dispose
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deferred
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effect
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effect_once
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effect_when
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error_boundary
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event_handler
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flatten
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for_each
V
fragment
V
get_owner
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h
V
handler
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handler_from_callback
V
has_dynamic_content
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has_owner
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internal_ref
V
island
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match_case
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memo
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on
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on_cleanup
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on_immediate
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on_mount
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previous
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previous_with_initial
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provide
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register_disposer
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register_owner_cleanup
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resource
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resource_rejected
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resource_resolved
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run_with_owner
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select
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show
V
signal
V
switch_
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text
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text_dyn
V
text_of
V
untracked
V
use_context
V
watch
V
watch_immediate
V
wc_component_ref
V
wc_island

mizchi/luna/core does not have a README file

Attr

pub enum Attr[E] {
  VStatic(String)
  VDynamic(() -> String)
  VHandler(EventHandler[E])
  VAction(String)
}

Attribute value that can be static or dynamic (signal-based)

ComponentRef

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pub(all) struct ComponentRef[T] {
  url : String
  props : T
  wc : Bool
  trigger : TriggerType
}

Component reference for type-safe Island embedding Represents a client-side component that can be embedded in server-rendered HTML

url: Path to the client JavaScript (e.g., "/static/counter.js")
props: Component props (must be ToJson serializable)
wc: Whether this is a Web Components based Island
trigger: When to hydrate the component

EventHandler

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pub struct EventHandler[E] {
  callback : (E) -> Unit
}

Event handler type - newtype wrapper for callback function

EventHandler::get_callback

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fn[E] EventHandler::get_callback(self : EventHandler[E]) -> ((E) -> Unit)

Get the callback function

MatchCase

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pub struct MatchCase[E] {
  when : () -> Bool
  render : () -> Node[E]
}

Match case for Switch - pairs a condition with content

Node

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pub enum Node[E] {
  Element(VElement[E])
  Text(String)
  DynamicText(() -> String)
  Fragment(Array[Node[E]])
  Show(() -> Bool, () -> Node[E])
  For(() -> Array[Node[E]])
  Component(() -> Node[E])
  Island(VIsland[E])
  WcIsland(VWcIsland[E])
  Async(VAsync[E])
  ErrorBoundary(VErrorBoundary[E])
  Switch(VSwitch[E])
  InternalRef(VInternalRef[E])
}

Virtual DOM node types

TriggerType

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#alias(Trigger)
pub(all) enum TriggerType {
  Load
  Idle
  Visible
  Media(String)
  None
}

Hydration trigger types - when to hydrate a component

TriggerType::parse

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fn TriggerType::parse(s : String) -> TriggerType

Parse TriggerType from string

TriggerType::to_string

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fn TriggerType::to_string(self : TriggerType) -> String

Convert TriggerType to attribute value

VAsync

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pub struct VAsync[E] {
  render : async () -> Node[E]
  fallback : () -> Node[E]
  on_error : (Error) -> Node[E]?
}

Virtual Async node for async rendering with error handling Note: async functions implicitly raise Error, no need for raise? annotation

VElement

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pub struct VElement[E] {
  tag : String
  attrs : Array[(String, Attr[E])]
  children : Array[Node[E]]
}

Virtual element node

VErrorBoundary

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pub struct VErrorBoundary[E] {
  children : () -> Node[E] raise
  fallback : (Error, () -> Unit) -> Node[E] raise
}

Virtual ErrorBoundary node for catching rendering errors Similar to Solid.js ErrorBoundary - catches errors during:

Child component rendering
Effects and memos within children Does NOT catch:
Event handler errors
Async errors outside render cycle

VInternalRef

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pub struct VInternalRef[E] {
  url : String
  state : String
  trigger : TriggerType
  wc : Bool
  styles : String
  children : Array[Node[E]]
}

Virtual Internal Reference node for type-safe Island embedding

VIsland

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pub struct VIsland[E] {
  id : String
  url : String
  state : String
  trigger : TriggerType
  children : Array[Node[E]]
}

Virtual Island node - serializable hydration unit

VSwitch

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pub struct VSwitch[E] {
  cases : Array[MatchCase[E]]
  fallback : () -> Node[E]?
}

Virtual Switch node - renders first matching case Similar to Solid.js /

cases: array of condition-content pairs, evaluated in order
fallback: optional content when no case matches

VWcIsland

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pub struct VWcIsland[E] {
  name : String
  url : String
  styles : String
  state : String
  trigger : TriggerType
  children : Array[Node[E]]
}

Virtual Web Components Island node - Web Components based hydration unit Uses Declarative Shadow DOM for SSR and DOM Parts for partial updates

action

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fn[E, A : Show] action(a : A) -> Attr[E]

Create an action attribute value - dispatches named action on event Used for declarative event handling with enum types: ("onclick", action(Increment)) // requires derive(Show)

Example:

pub enum MyAction { Increment; Decrement } derive(Show)
@luna.h("button", [("onclick", action(Increment))], [...])

async_

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fn[E] async_(render~ : async () -> Node[E], fallback~ : () -> Node[E], on_error? : (Error) -> Node[E]?) -> Node[E]

Create an async VNode with fallback

render: async function that produces the content (may raise errors)
fallback: shown while loading or on error (if no on_error handler)
on_error: optional custom error UI handler

attr_dynamic

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fn[E] attr_dynamic(getter : () -> String) -> Attr[E]

Create a dynamic attribute value

attr_dynamic_style

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fn[E] attr_dynamic_style(getter : () -> String) -> Attr[E]

Create a dynamic style attribute value

attr_handler

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fn[E] attr_handler(handler : EventHandler[E]) -> Attr[E]

Create a handler attribute value

attr_static

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fn[E] attr_static(value : String) -> Attr[E]

Create a static attribute value

attr_style

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fn[E] attr_style(style : String) -> Attr[E]

Create a style attribute value (string form, e.g. "color: red; margin: 10px")

component

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fn[E] component(render : () -> Node[E]) -> Node[E]

Create a component VNode

component_ref

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fn[T] component_ref(url : String, props : T, trigger? : TriggerType) -> ComponentRef[T]

Create a ComponentRef for a regular Island component

error_boundary

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fn[E] error_boundary(children~ : () -> Node[E] raise, fallback~ : (Error, () -> Unit) -> Node[E] raise) -> Node[E]

Create an error boundary VNode Catches errors during child rendering and displays fallback UI

children: lazy function that produces child content (may throw)
fallback: function receiving (error, reset) that produces fallback UI
- error: the caught Error
- reset: function to retry rendering children

Example:

error_boundary(
  children=fn() { risky_component() },
  fallback=fn(err, reset) {
    h("div", [], [
      text("Error: " + err.to_string()),
      h("button", [("onclick", handler(fn(_) { reset() }))], [text("Retry")])
    ])
  }
)

event_handler

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fn event_handler() -> EventHandler[Unit]

Create a placeholder event handler for SSR (noop)

for_each

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fn[E] for_each(items : () -> Array[Node[E]]) -> Node[E]

Create a list VNode

fragment

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fn[E] fragment(children : Array[Node[E]]) -> Node[E]

Create a fragment VNode

h

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fn[E] h(tag : String, attrs : Array[(String, Attr[E])], children : Array[Node[E]]) -> Node[E]

Create a VNode element

handler

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fn[E] handler(f : (E) -> Unit) -> EventHandler[E]

Create an event handler from a callback

handler_from_callback

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fn handler_from_callback(f : () -> Unit) -> EventHandler[Unit]

Create an event handler from a simple callback (ignores event, for SSR compatibility)

has_dynamic_content

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fn[E] has_dynamic_content(attrs : Array[(String, Attr[E])]) -> Bool

Check if element has dynamic content that needs hydration

internal_ref

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fn[E] internal_ref(url : String, state : String, trigger? : TriggerType, wc? : Bool, styles? : String, children? : Array[Node[E]]) -> Node[E]

Create an internal reference VNode (for server_dom.island())

island

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fn[E] island(id : String, url : String, state : String, children : Array[Node[E]], trigger? : TriggerType) -> Node[E]

Create an island VNode for partial hydration

match_case

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fn[E] match_case(when~ : () -> Bool, render~ : () -> Node[E]) -> MatchCase[E]

Create a match case for Switch

when: condition function, evaluated lazily
render: content to render when condition is true

show

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fn[E] show(when : () -> Bool, child : () -> Node[E]) -> Node[E]

Create a conditional VNode

switch_

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fn[E] switch_(cases~ : Array[MatchCase[E]], fallback? : () -> Node[E]?) -> Node[E]

Create a switch VNode - renders first matching case Similar to Solid.js /

Example:

switch_(
  cases=[
    match_case(when=fn() { state.get() == 1 }, render=fn() { text("One") }),
    match_case(when=fn() { state.get() == 2 }, render=fn() { text("Two") }),
  ],
  fallback=Some(fn() { text("Other") })
)

text

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fn[E] text(content : String) -> Node[E]

Create a text VNode

text_dyn

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fn[E] text_dyn(content : () -> String) -> Node[E]

Create a dynamic text VNode

text_of

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fn[E, T : Show] text_of(sig : @mizchi/luna/core/signal.Signal
Signal[T]) -> Node[E]

Create a text VNode from a signal

wc_component_ref

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fn[T] wc_component_ref(url : String, props : T, trigger? : TriggerType) -> ComponentRef[T]

Create a ComponentRef for a Web Components Island

wc_island

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fn[E] wc_island(name : String, url : String, styles : String, state : String, children : Array[Node[E]], trigger? : TriggerType) -> Node[E]

Create a Web Components island VNode for partial hydration Uses Declarative Shadow DOM for SSR

Source Files

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#Attr

#ComponentRef

#EventHandler

#EventHandler::get_callback

#MatchCase

#Node

#TriggerType

#TriggerType::parse

#TriggerType::to_string

#VAsync

#VElement

#VErrorBoundary

#VInternalRef

#VIsland

#VSwitch

#VWcIsland

#action

#async_

#attr_dynamic

#attr_dynamic_style

#attr_handler

#attr_static

#attr_style

#component

#component_ref

#error_boundary

#event_handler

#for_each

#fragment

#h

#handler

#handler_from_callback

#has_dynamic_content

#internal_ref

#island

#match_case

#show

#switch_

#text

#text_dyn

#text_of

#wc_component_ref

#wc_island

Source Files

Attr

ComponentRef

EventHandler

EventHandler::get_callback

MatchCase

Node

TriggerType

TriggerType::parse

TriggerType::to_string

VAsync

VElement

VErrorBoundary

VInternalRef

VIsland

VSwitch

VWcIsland

action

async_

attr_dynamic

attr_dynamic_style

attr_handler

attr_static

attr_style

component

component_ref

error_boundary

event_handler

for_each

fragment

h

handler

handler_from_callback

has_dynamic_content

internal_ref

island

match_case

show

switch_

text

text_dyn

text_of

wc_component_ref

wc_island