Struct Evaluator 

pub struct Evaluator { /* private fields */ }

Scheme evaluator

Corresponds to OpenJade’s Interpreter class.

Usage

let mut evaluator = Evaluator::new();
let result = evaluator.eval(expr, env)?;

Implementations

impl Evaluator

pub fn new() -> Self

Create a new evaluator without a grove

pub fn with_grove(grove: Rc<dyn Grove>) -> Self

Create a new evaluator with a grove

pub fn set_source_file(&mut self, file: String)

Set the current source file (for error reporting)

pub fn source_file(&self) -> Option<&str>

Get the current source file

pub fn set_position(&mut self, position: Position)

Set the current position (for error reporting)

pub fn set_backend(&mut self, backend: Rc<RefCell<dyn FotBuilder>>)

Set the backend

pub fn set_grove(&mut self, grove: Rc<dyn Grove>)

Set the grove

pub fn grove(&self) -> Option<&Rc<dyn Grove>>

Get the grove

pub fn set_current_node(&mut self, node: Box<dyn Node>)

Set the current node

pub fn current_node(&self) -> Option<Rc<Box<dyn Node>>>

Get the current node

pub fn clear_current_node(&mut self)

Clear the current node

pub fn process_root(&mut self, env: Gc<Environment>) -> EvalResult

Start DSSSL processing from the root node

Corresponds to OpenJade’s ProcessContext::process(). After template loading, this triggers automatic tree processing.

pub fn process_node(&mut self, env: Gc<Environment>) -> EvalResult

Process the current node

Corresponds to OpenJade’s ProcessContext::processNode().

Algorithm (from OpenJade):

1. If character data node, output directly
2. If element node: a. Find matching construction rule by GI b. If rule found, evaluate it (returns sosofo) c. If no rule, default behavior: process-children

pub fn eval(&mut self, expr: Value, env: Gc<Environment>) -> EvalResult

Evaluate an expression in an environment

Corresponds to OpenJade’s Interpreter::eval().

Evaluation Rules

1. Self-evaluating: Numbers, strings, bools, chars → return as-is
2. Symbols: Variable lookup in environment
3. Lists: Check first element for special forms, otherwise apply

Trait Implementations

impl Default for Evaluator

fn default() -> Self

Returns the “default value” for a type.