rulemorph 0.3.4

YAML-based declarative data transformation engine for CSV/JSON to JSON
Documentation 
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#[test]
fn test_eval_if_step_then_branch() {
    // if: { cond: { gt: ["$", 10] }, then: [{ multiply: 2 }] }
    let if_step = V2IfStep {
        cond: V2Condition::Comparison(V2Comparison {
            op: V2ComparisonOp::Gt,
            args: vec![
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::PipeValue,
                    steps: vec![],
                }),
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(10)),
                    steps: vec![],
                }),
            ],
        }),
        then_branch: V2Pipe {
            start: V2Start::PipeValue,
            steps: vec![V2Step::Op(V2OpStep {
                op: "multiply".to_string(),
                args: vec![V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(2)),
                    steps: vec![],
                })],
            })],
        },
        else_branch: None,
    };
    let record = json!({});
    let out = json!({});
    let ctx = V2EvalContext::new();
    let result = eval_v2_if_step(
        &if_step,
        EvalValue::Value(json!(20)),
        &record,
        None,
        &out,
        "test",
        &ctx,
    );
    assert!(matches!(result, Ok(EvalValue::Value(v)) if v == json!(40.0)));
}

#[test]
fn test_eval_if_step_else_branch() {
    // if: { cond: { gt: ["$", 10] }, then: [{ multiply: 2 }], else: [{ multiply: 0.5 }] }
    let if_step = V2IfStep {
        cond: V2Condition::Comparison(V2Comparison {
            op: V2ComparisonOp::Gt,
            args: vec![
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::PipeValue,
                    steps: vec![],
                }),
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(10)),
                    steps: vec![],
                }),
            ],
        }),
        then_branch: V2Pipe {
            start: V2Start::PipeValue,
            steps: vec![V2Step::Op(V2OpStep {
                op: "multiply".to_string(),
                args: vec![V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(2)),
                    steps: vec![],
                })],
            })],
        },
        else_branch: Some(V2Pipe {
            start: V2Start::PipeValue,
            steps: vec![V2Step::Op(V2OpStep {
                op: "multiply".to_string(),
                args: vec![V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(0.5)),
                    steps: vec![],
                })],
            })],
        }),
    };
    let record = json!({});
    let out = json!({});
    let ctx = V2EvalContext::new();
    // pipe value 5 is less than 10, so else branch is taken
    let result = eval_v2_if_step(
        &if_step,
        EvalValue::Value(json!(5)),
        &record,
        None,
        &out,
        "test",
        &ctx,
    );
    assert!(matches!(result, Ok(EvalValue::Value(v)) if v == json!(2.5)));
}

#[test]
fn test_eval_if_step_no_else_returns_pipe_value() {
    // if: { cond: { gt: ["$", 10] }, then: [{ multiply: 2 }] }
    let if_step = V2IfStep {
        cond: V2Condition::Comparison(V2Comparison {
            op: V2ComparisonOp::Gt,
            args: vec![
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::PipeValue,
                    steps: vec![],
                }),
                V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(10)),
                    steps: vec![],
                }),
            ],
        }),
        then_branch: V2Pipe {
            start: V2Start::PipeValue,
            steps: vec![V2Step::Op(V2OpStep {
                op: "multiply".to_string(),
                args: vec![V2Expr::Pipe(V2Pipe {
                    start: V2Start::Literal(json!(2)),
                    steps: vec![],
                })],
            })],
        },
        else_branch: None,
    };
    let record = json!({});
    let out = json!({});
    let ctx = V2EvalContext::new();
    // pipe value 5 is less than 10, no else branch, returns original pipe value
    let result = eval_v2_if_step(
        &if_step,
        EvalValue::Value(json!(5)),
        &record,
        None,
        &out,
        "test",
        &ctx,
    );
    assert!(matches!(result, Ok(EvalValue::Value(v)) if v == json!(5)));
}