Struct EvalOptions 

pub struct EvalOptions {
    pub max_node_evaluations: Option<u64>,
    pub max_iterations: Option<u64>,
    pub cancellation_token: Option<Arc<AtomicBool>>,
    pub lenient: bool,
}

Configuration for resource limits, cancellation, and error handling during template evaluation.

Create with EvalOptions::new() and chain builder methods:

use weaver_lang::EvalOptions;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;

let token = Arc::new(AtomicBool::new(false));
let opts = EvalOptions::new()
    .max_node_evaluations(10_000)
    .max_iterations(1_000)
    .cancellation_token(token)
    .lenient(true);

Fields

max_node_evaluations: Option<u64>

Maximum number of AST node evaluations before the evaluator returns a ResourceLimit error. None means unlimited.

max_iterations: Option<u64>

Maximum number of loop iterations (across all foreach blocks) before the evaluator returns a ResourceLimit error. None means unlimited.

cancellation_token: Option<Arc<AtomicBool>>

An external flag that can be set to true to cancel an in-progress evaluation. Checked after each node evaluation.

lenient: bool

When true, undefined variables, failed processor/command calls, and trigger/document errors render as their original raw syntax instead of producing hard errors.

Useful for preview/authoring contexts where partial results are preferred over failure.

Implementations

impl EvalOptions

pub fn new() -> Self

Create a new EvalOptions with all defaults (no limits, strict mode).

pub fn max_node_evaluations(self, limit: u64) -> Self

Set the maximum number of AST node evaluations.

pub fn max_iterations(self, limit: u64) -> Self

Set the maximum number of loop iterations.

pub fn cancellation_token(self, token: Arc<AtomicBool>) -> Self

Attach a cancellation token. Set the AtomicBool to true from another thread to abort evaluation.

pub fn lenient(self, lenient: bool) -> Self

Enable or disable lenient evaluation mode.

Trait Implementations

impl Clone for EvalOptions

fn clone(&self) -> EvalOptions

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EvalOptions

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EvalOptions

fn default() -> EvalOptions

Returns the “default value” for a type.