Merge branch 'helper_not_equals' into dust_helpers

js/test_cases/helpers_ne/README.md

@@ -0,0 +1,10 @@
+Without a key parameter, neither the main block nor the else block is rendered.
+
+Literal values work in both keys and values.
+
+Can't Walk Theory
+-----------------
+
+Assuming a missing value = cantwalk and a non-existent key = cantwalk then their equality makes sense.
+
+The null tests have proven that absent parameters and missing values do not equal null and therefore it is not just making all falsey values equal.

js/test_cases/helpers_ne/input1.json

@@ -0,0 +1,7 @@
+{
+  "str": "master",
+  "int": 7,
+  "alpha": 21,
+  "beta": "21",
+  "null": null
+}

js/test_cases/helpers_ne/main.dust

@@ -0,0 +1,18 @@
+Testing helpers:{~n}
+str is {str}{~n}
+int is {int}{~n}
+alpha is {alpha}{~n}
+beta is {beta}{~n}
+{@ne key=str value="master"}str does not equal "master"{:else}str is equal to "master"{/ne}{~n}
+{@ne key=str value="7"}str does not equal "7"{:else}str is equal to "7"{/ne}{~n}
+{@ne key=int value="7"}int does not equal "7"{:else}int is equal to "7"{/ne}{~n}
+{@ne key=int value=7}int does not equal 7{:else}int is equal to 7{/ne}{~n}
+{@ne key=alpha value=beta}alpha does not equal beta{:else}alpha is equal to beta{/ne}{~n}
+{@ne value=beta}missing key is true{:else}missing key is false{/ne}{~n}
+{@ne value=gamma}missing key and non-existent value is true{:else}missing key and non-existent value is false{/ne}{~n}
+{@ne key=alpha}missing value is true{:else}missing value is false{/ne}{~n}
+{@ne key=gamma}missing value and non-existent key is true{:else}missing value and non-existent key is false{/ne}{~n}
+{@ne key="master" value="master"}"master" does not equal "master"{:else}"master" is equal to "master"{/ne}{~n}
+{@ne key=null}null does not equal a missing value{:else}null equals a missing value{/ne}{~n}
+{@ne key=null value=gamma}null does not equal non-existent value{:else}null equals a non-existent value{/ne}{~n}
+{@ne}no parameters is true{:else}no parameters if false{/ne}{~n}

src/renderer/renderer.rs

@@ -265,6 +265,47 @@ impl<'a> DustRenderer<'a> {
                     }
                 }
             }
+            DustTag::DTHelperNotEquals(parameterized_block) => {
+                let param_map: HashMap<&str, &RValue<'a>> = parameterized_block
+                    .params
+                    .iter()
+                    .map(|pair: &KVPair<'a>| (pair.key, &pair.value))
+                    .collect();
+                let left_side: Result<&dyn ContextElement, WalkError> = match param_map.get("key") {
+                    None => return Ok("".to_owned()),
+                    Some(rval) => match rval {
+                        RValue::RVString(text) => Ok(text),
+                        RValue::RVPath(path) => walk_path(breadcrumbs, &path.keys),
+                        RValue::RVPositiveInteger(num) => Ok(num),
+                    },
+                };
+                let right_side: Result<&dyn ContextElement, WalkError> =
+                    match param_map.get("value") {
+                        None => Err(WalkError::CantWalk),
+                        Some(rval) => match rval {
+                            RValue::RVString(text) => Ok(text),
+                            RValue::RVPath(path) => walk_path(breadcrumbs, &path.keys),
+                            RValue::RVPositiveInteger(num) => Ok(num),
+                        },
+                    };
+                if left_side != right_side {
+                    match &parameterized_block.contents {
+                        None => return Ok("".to_owned()),
+                        Some(body) => {
+                            let rendered_content = self.render_body(body, breadcrumbs, blocks)?;
+                            return Ok(rendered_content);
+                        }
+                    }
+                } else {
+                    match &parameterized_block.else_contents {
+                        None => return Ok("".to_owned()),
+                        Some(body) => {
+                            let rendered_content = self.render_body(body, breadcrumbs, blocks)?;
+                            return Ok(rendered_content);
+                        }
+                    }
+                }
+            }
             _ => (), // TODO: Implement the rest
         }
         Ok("".to_owned())