runjucks_core 0.1.6

Pure Rust Nunjucks-compatible template engine core (Runjucks)
Documentation 
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//! Parser parity with nunjucks expression / output parsing.
//! See nunjucks/tests/parser.js (`should parse basic types`, …).

use runjucks_core::ast::{BinOp, Expr, Node};
use runjucks_core::lexer::tokenize;
use runjucks_core::parser::parse;
use serde_json::{json, Value};

#[test]
fn parse_output_integer_literal() {
    let tokens = tokenize("{{ 1 }}").unwrap();
    let ast = parse(&tokens).unwrap();
    assert_eq!(
        ast,
        Node::Root(vec![Node::Output(vec![Expr::Literal(json!(1))])])
    );
}

#[test]
fn parse_output_float_literal() {
    let tokens = tokenize("{{ 4.567 }}").unwrap();
    let ast = parse(&tokens).unwrap();
    assert_eq!(
        ast,
        Node::Root(vec![Node::Output(vec![Expr::Literal(json!(4.567))])])
    );
}

#[test]
fn parse_output_string_double_quotes() {
    let tokens = tokenize("{{ \"foo\" }}").unwrap();
    let ast = parse(&tokens).unwrap();
    assert_eq!(
        ast,
        Node::Root(vec![Node::Output(vec![Expr::Literal(json!("foo"))])])
    );
}

#[test]
fn parse_output_bool_true() {
    let tokens = tokenize("{{ true }}").unwrap();
    let ast = parse(&tokens).unwrap();
    assert_eq!(
        ast,
        Node::Root(vec![Node::Output(vec![Expr::Literal(json!(true))])])
    );
}

#[test]
fn parse_output_none_as_null() {
    let tokens = tokenize("{{ none }}").unwrap();
    let ast = parse(&tokens).unwrap();
    assert_eq!(
        ast,
        Node::Root(vec![Node::Output(vec![Expr::Literal(Value::Null)])])
    );
}

#[test]
fn parse_output_binary_addition() {
    let tokens = tokenize("{{ 2 + 3 }}").unwrap();
    let ast = parse(&tokens).unwrap();
    match ast {
        Node::Root(ref ch) if ch.len() == 1 => match &ch[0] {
            Node::Output(exprs) if exprs.len() == 1 => match &exprs[0] {
                Expr::Binary {
                    op: BinOp::Add,
                    left,
                    right,
                } => {
                    assert_eq!(**left, Expr::Literal(json!(2)));
                    assert_eq!(**right, Expr::Literal(json!(3)));
                }
                _ => panic!("unexpected {:?}", exprs[0]),
            },
            _ => panic!("unexpected {:?}", ch[0]),
        },
        _ => panic!("unexpected {:?}", ast),
    }
}