1 files changed, 43 insertions, 0 deletions
diff --git a/askama_derive/src/parser.rs b/askama_derive/src/parser.rs
new file mode 100644
index 0000000..5f3f8c5
--- /dev/null
+++ b/askama_derive/src/parser.rs
@@ -0,0 +1,43 @@
+use nom::{self, IResult};
+
+pub enum Expr<'a> {
+     Var(&'a [u8]),
+}
+
+pub enum Node<'a> {
+    Lit(&'a [u8]),
+    Expr(Expr<'a>),
+}
+
+fn take_content(i: &[u8]) -> IResult<&[u8], Node> {
+    if i.len() < 1 || i[0] == b'{' {
+        return IResult::Error(error_position!(nom::ErrorKind::TakeUntil, i));
+    }
+    for (j, c) in i.iter().enumerate() {
+        if *c == b'{' {
+            if i.len() < j + 2 {
+                return IResult::Done(&i[..0], Node::Lit(&i[..]));
+            } else if i[j + 1] == '{' as u8 {
+                return IResult::Done(&i[j..], Node::Lit(&i[..j]));
+            } else if i[j + 1] == '%' as u8 {
+                return IResult::Done(&i[j..], Node::Lit(&i[..j]));
+            }
+        }
+    }
+    IResult::Done(&i[..0], Node::Lit(&i[..]))
+}
+
+named!(expr_var<Expr>, map!(ws!(nom::alphanumeric), Expr::Var));
+
+named!(any_expr<Expr>, delimited!(tag!("{{"), expr_var, tag!("}}")));
+
+named!(expr_node<Node>, map!(any_expr, Node::Expr));
+
+named!(parse_template< Vec<Node> >, many1!(alt!(take_content | expr_node)));
+
+pub fn parse<'a>(src: &'a str) -> Vec<Node> {
+    match parse_template(src.as_bytes()) {
+        IResult::Done(_, res) => res,
+        _ => panic!("problems parsing template source"),
+    }
+}