Struct InReader 

pub struct InReader<'a, 'c> { /* private fields */ }

Field reader used by node factories: classifies each field as literal / $param / @node and accumulates the node’s scalar port plumbing. See the module docs for the usage pattern.

Implementations

impl<'a, 'c> InReader<'a, 'c>

pub fn new( fields: &'a Map<String, Value>, ctx: &'a FactoryCtx<'c>, fixed_ports: usize, ) -> Self

fixed_ports is the number of input ports the node declares before any scalar ports (e.g. 1 for blur’s input). Scalar port indices start there.

pub fn number(&mut self, name: &'static str) -> Result<In<f64>, FactoryError>

Required number field.

pub fn number_or( &mut self, name: &'static str, default: f64, ) -> Result<In<f64>, FactoryError>

Optional number field with a default.

pub fn color( &mut self, name: &'static str, ) -> Result<In<[f32; 4]>, FactoryError>

Required color field (#rrggbb[aa], $param, or @node).

pub fn color_or( &mut self, name: &'static str, default: [f32; 4], ) -> Result<In<[f32; 4]>, FactoryError>

Optional color field with a default.

pub fn color_opt( &mut self, name: &'static str, ) -> Result<Option<In<[f32; 4]>>, FactoryError>

Optional color field; None when absent.

pub fn bool_or( &mut self, name: &'static str, default: bool, ) -> Result<In<bool>, FactoryError>

Optional bool field with a default.

pub fn nested<T: ScalarType>( &mut self, label: &str, v: &Value, ) -> Result<In<T>, FactoryError>

Read a scalar that lives inside a composite field — one stop of a colour ramp, one entry of a palette, one number of a dash pattern. label names the position for error messages ("stops[2].color").

Accepts a literal or a $param, but not a @node: a port needs a &'static str name and its own slot in Node::inputs(), and a table of unknown length can offer neither. Resolve the whole table once per eval, never per pixel.

pub fn finish(self) -> InParts

Hand back the accumulated ports / connections / param refs.