lumen_engine/expr/
mod.rs

1//! Expression AST, parser, and runtime evaluator for property-driven values.
2
3pub mod ast;
4pub mod builtins;
5pub mod eval;
6pub mod parser;
7
8use crate::{error::ExpressionError, graph::Graph};
9
10pub use ast::{
11    BinaryOp, BuiltinFn, ExprNode, Expression, ExpressionId, ExpressionReference, ExpressionValue,
12    GlobalVar, PropertyPath, UnaryOp, VirtualPropertyId,
13};
14pub use eval::property_value_to_expression_value;
15
16impl Expression {
17    pub fn parse(source: &str) -> Result<Self, ExpressionError> {
18        parser::parse_expression(source)
19    }
20}
21
22#[derive(Debug)]
23pub struct ExpressionContext<'a> {
24    pub frame: u32,
25    pub fps: f32,
26    pub width: u32,
27    pub height: u32,
28    pub duration_frames: u32,
29    pub path: Option<String>,
30    pub graph: Option<&'a Graph>,
31}
32
33impl Default for ExpressionContext<'_> {
34    fn default() -> Self {
35        Self {
36            frame: 0,
37            fps: 0.0,
38            width: 0,
39            height: 0,
40            duration_frames: 0,
41            path: None,
42            graph: None,
43        }
44    }
45}
46
47impl ExpressionContext<'_> {
48    pub fn time_seconds(&self) -> f64 {
49        if self.fps <= 0.0 {
50            0.0
51        } else {
52            self.frame as f64 / self.fps as f64
53        }
54    }
55}
lumen_engine/expr/mod.rs

lumen_engine/expr/
mod.rs
