Add support for array literals (fixes #59)

askama_shared/src/generator.rs

@@ -573,6 +573,7 @@ impl<'a> Generator<'a> {
             Expr::StrLit(s) => self.visit_str_lit(s),
             Expr::Var(s) => self.visit_var(s),
             Expr::Path(ref path) => self.visit_path(path),
+            Expr::Array(ref elements) => self.visit_array(elements),
             Expr::Attr(ref obj, name) => self.visit_attr(obj, name),
             Expr::Filter(name, ref args) => self.visit_filter(name, args),
             Expr::BinOp(op, ref left, ref right) =>
@@ -683,6 +684,18 @@ impl<'a> Generator<'a> {
         DisplayWrap::Unwrapped
     }
 
+    fn visit_array(&mut self, elements: &Vec<Expr>) -> DisplayWrap {
+        self.write("[");
+        for (i, el) in elements.iter().enumerate() {
+            if i > 0 {
+                self.write(", ");
+            }
+            self.visit_expr(el);
+        }
+        self.write("]");
+        DisplayWrap::Unwrapped
+    }
+
     fn visit_path(&mut self, path: &Vec<&str>) -> DisplayWrap {
         for (i, part) in path.iter().enumerate() {
             if i > 0 {

askama_shared/src/parser.rs

@@ -7,6 +7,7 @@ pub enum Expr<'a> {
     StrLit(&'a str),
     Var(&'a str),
     Path(Vec<&'a str>),
+    Array(Vec<Expr<'a>>),
     Attr(Box<Expr<'a>>, &'a str),
     Filter(&'a str, Vec<Expr<'a>>),
     BinOp(&'a str, Box<Expr<'a>>, Box<Expr<'a>>),
@@ -128,6 +129,22 @@ named!(expr_num_lit<Expr>, map!(num_lit,
     |s| Expr::NumLit(s)
 ));
 
+named!(expr_array_lit<Expr>, do_parse!(
+    ws!(tag_s!("[")) >>
+    first: expr_any >>
+    rest: many0!(do_parse!(
+        ws!(tag_s!(",")) >>
+        part: expr_any >>
+        (part)
+    )) >>
+    ws!(tag_s!("]")) >>
+    ({
+        let mut elements = vec![first];
+        elements.extend(rest);
+        Expr::Array(elements)
+    })
+));
+
 named!(expr_str_lit<Expr>, map!(
     delimited!(char!('"'), is_not!("\""), char!('"')),
     |s| Expr::StrLit(str::from_utf8(s).unwrap())
@@ -204,6 +221,7 @@ named!(expr_single<Expr>, alt!(
     expr_num_lit |
     expr_str_lit |
     expr_path |
+    expr_array_lit |
     expr_var |
     expr_group
 ));

testing/tests/simple.rs

@@ -184,3 +184,14 @@ fn test_path_compare() {
     let t = PathCompareTemplate { x: Alphabet::Alpha };
     assert_eq!(t.render().unwrap(), "true");
 }
+
+
+#[derive(Template)]
+#[template(source = "{% for i in [1, 2] %}{{ i }}{% endfor %}", ext = "txt")]
+struct ArrayTemplate {}
+
+#[test]
+fn test_slice_literal() {
+    let t = ArrayTemplate {};
+    assert_eq!(t.render().unwrap(), "12");
+}