From be99df789a21257da18a3664f4ac6409314e8682 Mon Sep 17 00:00:00 2001
From: Dirkjan Ochtman <dirkjan@ochtman.nl>
Date: Sat, 4 Feb 2017 21:45:54 +0100
Subject: Generalize support for comparison operators

---
 askama/src/generator.rs |  7 ++++---
 askama/src/parser.rs    | 15 ++++++++++-----
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/askama/src/generator.rs b/askama/src/generator.rs
index 7ad1313..56bd19e 100644
--- a/askama/src/generator.rs
+++ b/askama/src/generator.rs
@@ -91,9 +91,9 @@ impl Generator {
         self.write(")");
     }
 
-    fn visit_eq(&mut self, left: &Expr, right: &Expr) {
+    fn visit_compare(&mut self, op: &str, left: &Expr, right: &Expr) {
         self.visit_expr(left);
-        self.write(" == ");
+        self.write(&format!(" {} ", op));
         self.visit_expr(right);
     }
 
@@ -101,7 +101,8 @@ impl Generator {
         match expr {
             &Expr::Var(s) => self.visit_var(s),
             &Expr::Filter(name, ref val) => self.visit_filter(name, &val),
-            &Expr::Eq(ref left, ref right) => self.visit_eq(&left, &right),
+            &Expr::Compare(op, ref left, ref right) =>
+                self.visit_compare(op, &left, &right),
         }
     }
 
diff --git a/askama/src/parser.rs b/askama/src/parser.rs
index d0ad809..f395cb6 100644
--- a/askama/src/parser.rs
+++ b/askama/src/parser.rs
@@ -4,7 +4,7 @@ use std::str;
 pub enum Expr<'a> {
     Var(&'a [u8]),
     Filter(&'a str, Box<Expr<'a>>),
-    Eq(Box<Expr<'a>>, Box<Expr<'a>>),
+    Compare(&'a str, Box<Expr<'a>>, Box<Expr<'a>>),
 }
 
 pub enum Target<'a> {
@@ -66,13 +66,18 @@ fn expr_filtered(i: &[u8]) -> IResult<&[u8], Expr> {
     return IResult::Done(left, expr);
 }
 
-named!(expr_eq<Expr>, do_parse!(
+named!(expr_compare<Expr>, do_parse!(
     left: expr_filtered >>
-    ws!(tag_s!("==")) >>
+    op: ws!(alt!(
+        tag_s!("==") | tag_s!("!=") |
+        tag_s!(">=") | tag_s!(">") |
+        tag_s!("<=") | tag_s!("<")
+    )) >>
     right: expr_filtered >>
-    (Expr::Eq(Box::new(left), Box::new(right)))));
+    (Expr::Compare(str::from_utf8(op).unwrap(),
+                   Box::new(left), Box::new(right)))));
 
-named!(expr_any<Expr>, alt!(expr_eq | expr_filtered));
+named!(expr_any<Expr>, alt!(expr_compare | expr_filtered));
 
 named!(expr_node<Node>, map!(
     delimited!(tag_s!("{{"), ws!(expr_any), tag_s!("}}")),
-- 
cgit