Function parse_expression 

pub fn parse_expression(s: &str) -> Option<Expression>

Parse an expression string.

The string should be in the form ${...} containing a pipeline expression. Returns None for anything else; parse_expression_detailed returns the reason instead.

Examples

use rite_model::expression::{parse_expression, Expression, Reference, RefType, PipeStage};

// Simple reference
let expr = parse_expression("${artifact.ksr}").unwrap();
assert!(matches!(expr, Expression::Reference(_)));

// Pipeline
let expr = parse_expression("${artifact.ksr | sha256 | hex}").unwrap();
if let Expression::Pipeline { stages, .. } = expr {
    assert_eq!(stages.len(), 2);
    assert_eq!(stages[0].function, "sha256");
    assert_eq!(stages[1].function, "hex");
}