maud/maud_macros/tests/control_structures.rs

#![feature(conservative_impl_trait, plugin)]
#![plugin(maud_macros)]

extern crate maud;

#[test]
fn if_expr() {
    for (number, &name) in (1..4).zip(["one", "two", "three"].iter()) {
        let s = html! {
            @if number == 1 {
                "one"
            } @else if number == 2 {
                "two"
            } @else if number == 3 {
                "three"
            } @else {
                "oh noes"
            }
        }.into_string();
        assert_eq!(s, name);
    }
}

#[test]
fn if_let() {
    for &(input, output) in &[(Some("yay"), "yay"), (None, "oh noes")] {
        let s = html! {
            @if let Some(value) = input {
                (value)
            } @else {
                "oh noes"
            }
        }.into_string();
        assert_eq!(s, output);
    }
}

#[test]
fn while_expr() {
    let mut numbers = (0..3).into_iter().peekable();
    let s = html! {
        ul @while numbers.peek().is_some() {
            li (numbers.next().unwrap())
        }
    }.into_string();
    assert_eq!(s, "<ul><li>0</li><li>1</li><li>2</li></ul>");
}

#[test]
fn while_let_expr() {
    let mut numbers = (0..3).into_iter();
    #[allow(while_let_on_iterator)]  // Clippy
    let s = html! {
        ul @while let Some(n) = numbers.next() {
            li (n)
        }
    }.into_string();
    assert_eq!(s, "<ul><li>0</li><li>1</li><li>2</li></ul>");
}

#[test]
fn for_expr() {
    let ponies = ["Apple Bloom", "Scootaloo", "Sweetie Belle"];
    let s = html! {
        ul @for pony in &ponies {
            li (pony)
        }
    }.into_string();
    assert_eq!(s, concat!(
            "<ul>",
            "<li>Apple Bloom</li>",
            "<li>Scootaloo</li>",
            "<li>Sweetie Belle</li>",
            "</ul>"));
}

#[test]
fn match_expr() {
    for &(input, output) in &[(Some("yay"), "<div>yay</div>"), (None, "oh noes")] {
        let s = html! {
            @match input {
                Some(value) => {
                    div (value)
                },
                None => {
                    "oh noes"
                },
            }
        }.into_string();
        assert_eq!(s, output);
    }
}

#[test]
fn match_expr_without_delims() {
    for &(input, output) in &[(Some("yay"), "yay"), (None, "<span>oh noes</span>")] {
        let s = html! {
            @match input {
                Some(value) => (value),
                None => span "oh noes",
            }
        }.into_string();
        assert_eq!(s, output);
    }
}

#[test]
fn match_expr_with_guards() {
    for &(input, output) in &[(Some(1), "one"), (None, "none"), (Some(2), "2")] {
        let s = html! {
            @match input {
                Some(value) if value == 1 => "one",
                Some(value) => (value),
                None => "none",
            }
        }.into_string();
        assert_eq!(s, output);
    }
}

#[test]
fn match_in_attribute() {
    for &(input, output) in &[(1, "<span class=\"one\">1</span>"), (2, "<span class=\"two\">2</span>"), (3, "<span class=\"many\">3</span>")] {
        let s = html! {
            span class=@match input {
                1 => "one",
                2 => "two",
                _ => "many",
            } { (input) }
        }.into_string();
        assert_eq!(s, output);
    }
}

#[test]
fn let_expr() {
    let s = html! {
        @let x = 42 {
            "I have " (x) " cupcakes!"
        }
    }.into_string();
    assert_eq!(s, "I have 42 cupcakes!");
}

#[test]
fn let_lexical_scope() {
    let x = 42;
    let s = html! {
        @let x = 99 {
            "Twilight thought I had " (x) " cupcakes, "
        }
        "but I only had " (x) "."
    }.into_string();
    assert_eq!(s, concat!(
            "Twilight thought I had 99 cupcakes, ",
            "but I only had 42."));
}