Struct DataContext 

#[non_exhaustive]
pub struct DataContext { /* private fields */ }

Implementations

impl DataContext

pub fn new() -> Self

Create a new empty data context.

pub fn set<V: Into<DataValue>>(&mut self, key: &str, value: V)

Set a value. Accepts various types via Into<DataValue>.

pub fn get(&self, key: &str) -> Option<&DataValue>

Get a value by key.

pub fn lang(&self) -> &str

The active language locale code (e.g. "en" / "zh"), read from the reserved __lang key. Callers set it with ctx.set("__lang", "zh") before rendering; it selects the variant for @t("en", "中文") text. Defaults to "en" when unset.

pub fn is_truthy(&self, key: &str) -> bool

Check if variable exists and is truthy (for visible field evaluation). Returns true if:

• The value is Bool(true)
• The value is a non-zero Int
• The value exists and is any other type Returns false if the key is absent or the value is Bool(false) / Int(0).

pub fn resolve(&self, template: &str) -> String

Resolve a template string by substituting {var}, {var:0W}, and {var%N} patterns.

Examples

let mut ctx = DataContext::new();
ctx.set("name", "LEAFKIT");
assert_eq!(ctx.resolve("{name}"), "LEAFKIT");

ctx.set("num", 1i64);
assert_eq!(ctx.resolve("\u{2116}\u{2022}{num:03}"), "\u{2116}\u{2022}001");

ctx.set("weight", 150i64);
assert_eq!(ctx.resolve("{weight%10}"), "0");

Trait Implementations

impl Clone for DataContext

fn clone(&self) -> DataContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DataContext

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

Formats the value using the given formatter.