issue 529: simplify lifetime requirements

src/block.rs

@@ -56,21 +56,21 @@ impl<'reg> BlockParams<'reg> {
 
 /// A data structure holds contextual data for current block scope.
 #[derive(Debug, Clone, Default)]
-pub struct BlockContext<'reg> {
+pub struct BlockContext<'rc> {
     /// the base_path of current block scope
     base_path: Vec<String>,
     /// the base_value of current block scope, when the block is using a
     /// constant or derived value as block base
     base_value: Option<Json>,
     /// current block context variables
-    block_params: BlockParams<'reg>,
+    block_params: BlockParams<'rc>,
     /// local variables in current context
     local_variables: LocalVars,
 }
 
-impl<'reg> BlockContext<'reg> {
+impl<'rc> BlockContext<'rc> {
     /// create a new `BlockContext` with default data
-    pub fn new() -> BlockContext<'reg> {
+    pub fn new() -> BlockContext<'rc> {
         BlockContext::default()
     }
 
@@ -120,7 +120,7 @@ impl<'reg> BlockContext<'reg> {
     }
 
     /// Set a block parameter into this block.
-    pub fn set_block_params(&mut self, block_params: BlockParams<'reg>) {
+    pub fn set_block_params(&mut self, block_params: BlockParams<'rc>) {
         self.block_params = block_params;
     }
 }

src/context.rs

@@ -169,7 +169,7 @@ impl Context {
         &'rc self,
         relative_path: &[PathSeg],
         block_contexts: &VecDeque<BlockContext<'reg>>,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+    ) -> Result<ScopedJson<'rc>, RenderError> {
         // always use absolute at the moment until we get base_value lifetime issue fixed
         let resolved_visitor = parse_json_visitor(relative_path, block_contexts, true);
 
@@ -239,7 +239,7 @@ mod test {
     fn navigate_from_root<'reg, 'rc>(
         ctx: &'rc Context,
         path: &str,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+    ) -> Result<ScopedJson<'rc>, RenderError> {
         let relative_path = Path::parse(path).unwrap();
         ctx.navigate(relative_path.segs().unwrap(), &VecDeque::new())
     }

src/decorators/inline.rs

@@ -7,7 +7,7 @@ use crate::render::{Decorator, RenderContext};
 #[derive(Clone, Copy)]
 pub struct InlineDecorator;
 
-fn get_name<'reg: 'rc, 'rc>(d: &Decorator<'reg, 'rc>) -> Result<String, RenderError> {
+fn get_name<'reg: 'rc, 'rc>(d: &Decorator<'rc>) -> Result<String, RenderError> {
     d.param(0)
         .ok_or_else(|| RenderError::new("Param required for decorator \"inline\""))
         .and_then(|v| {
@@ -21,7 +21,7 @@ fn get_name<'reg: 'rc, 'rc>(d: &Decorator<'reg, 'rc>) -> Result<String, RenderEr
 impl DecoratorDef for InlineDecorator {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        d: &Decorator<'reg, 'rc>,
+        d: &Decorator<'rc>,
         _: &'reg Registry<'reg>,
         _: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,

src/decorators/mod.rs

@@ -59,7 +59,7 @@ pub type DecoratorResult = Result<(), RenderError>;
 pub trait DecoratorDef {
     fn call<'reg: 'rc, 'rc>(
         &'reg self,
-        d: &Decorator<'reg, 'rc>,
+        d: &Decorator<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,
@@ -69,7 +69,7 @@ pub trait DecoratorDef {
 /// Implement DecoratorDef for bare function so we can use function as decorator
 impl<
         F: for<'reg, 'rc> Fn(
-            &Decorator<'reg, 'rc>,
+            &Decorator<'rc>,
             &'reg Registry<'reg>,
             &'rc Context,
             &mut RenderContext<'reg, 'rc>,
@@ -78,7 +78,7 @@ impl<
 {
     fn call<'reg: 'rc, 'rc>(
         &'reg self,
-        d: &Decorator<'reg, 'rc>,
+        d: &Decorator<'rc>,
         reg: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,
@@ -114,7 +114,7 @@ mod test {
         handlebars.register_decorator(
             "foo",
             Box::new(
-                |_: &Decorator<'_, '_>,
+                |_: &Decorator<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  _: &mut RenderContext<'_, '_>|
@@ -139,7 +139,7 @@ mod test {
         handlebars.register_decorator(
             "foo",
             Box::new(
-                |_: &Decorator<'_, '_>,
+                |_: &Decorator<'_>,
                  _: &Registry<'_>,
                  ctx: &Context,
                  rc: &mut RenderContext<'_, '_>|
@@ -167,7 +167,7 @@ mod test {
         handlebars.register_decorator(
             "bar",
             Box::new(
-                |d: &Decorator<'_, '_>,
+                |d: &Decorator<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  rc: &mut RenderContext<'_, '_>|
@@ -224,7 +224,7 @@ mod test {
         handlebars.register_helper(
             "distance",
             Box::new(
-                |h: &Helper<'_, '_>,
+                |h: &Helper<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  _: &mut RenderContext<'_, '_>,
@@ -245,7 +245,7 @@ mod test {
         handlebars.register_decorator(
             "foo",
             Box::new(
-                |d: &Decorator<'_, '_>,
+                |d: &Decorator<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  rc: &mut RenderContext<'_, '_>|
@@ -256,7 +256,7 @@ mod test {
                         .and_then(|v| as_string(v.value()))
                         .unwrap_or("")
                         .to_owned();
-                    let new_helper = move |h: &Helper<'_, '_>,
+                    let new_helper = move |h: &Helper<'_>,
                                            _: &Registry<'_>,
                                            _: &Context,
                                            _: &mut RenderContext<'_, '_>,
@@ -282,7 +282,7 @@ mod test {
         handlebars.register_decorator(
             "bar",
             Box::new(
-                |_: &Decorator<'_, '_>,
+                |_: &Decorator<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  rc: &mut RenderContext<'_, '_>|

src/helpers/block_util.rs

@@ -1,9 +1,7 @@
 use crate::block::BlockContext;
 use crate::json::value::PathAndJson;
 
-pub(crate) fn create_block<'reg: 'rc, 'rc>(
-    param: &'rc PathAndJson<'reg, 'rc>,
-) -> BlockContext<'reg> {
+pub(crate) fn create_block<'rc>(param: &PathAndJson<'rc>) -> BlockContext<'rc> {
     let mut block = BlockContext::new();
 
     if let Some(new_path) = param.context_path() {

src/helpers/helper_each.rs

@@ -29,9 +29,9 @@ fn update_block_context<'reg>(
     }
 }
 
-fn set_block_param<'reg: 'rc, 'rc>(
-    block: &mut BlockContext<'reg>,
-    h: &Helper<'reg, 'rc>,
+fn set_block_param<'rc>(
+    block: &mut BlockContext<'rc>,
+    h: &Helper<'rc>,
     base_path: Option<&Vec<String>>,
     k: &Json,
     v: &Json,
@@ -66,7 +66,7 @@ pub struct EachHelper;
 impl HelperDef for EachHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,
@@ -183,13 +183,13 @@ mod test {
         assert!(handlebars
             .register_template_string(
                 "t0",
-                "{{#each this}}{{@first}}|{{@last}}|{{@index}}:{{this}}|{{/each}}"
+                "{{#each this}}{{@first}}|{{@last}}|{{@index}}:{{this}}|{{/each}}",
             )
             .is_ok());
         assert!(handlebars
             .register_template_string(
                 "t1",
-                "{{#each this}}{{@first}}|{{@last}}|{{@key}}:{{this}}|{{/each}}"
+                "{{#each this}}{{@first}}|{{@last}}|{{@key}}:{{this}}|{{/each}}",
             )
             .is_ok());
 
@@ -238,7 +238,7 @@ mod test {
         assert!(handlebars
             .register_template_string(
                 "t0",
-                "{{#each a}}{{#each b}}{{d}}:{{../c}}{{/each}}{{/each}}"
+                "{{#each a}}{{#each b}}{{d}}:{{../c}}{{/each}}{{/each}}",
             )
             .is_ok());
 
@@ -256,7 +256,7 @@ mod test {
         assert!(handlebars
             .register_template_string(
                 "t0",
-                "{{#each b}}{{#if ../a}}{{#each this}}{{this}}{{/each}}{{/if}}{{/each}}"
+                "{{#each b}}{{#if ../a}}{{#each this}}{{this}}{{/each}}{{/if}}{{/each}}",
             )
             .is_ok());
 
@@ -373,7 +373,7 @@ mod test {
         assert!(handlebars
             .register_template_string(
                 "t0",
-                "{{#each a.b}}{{#each c}}{{../../d}}{{/each}}{{/each}}"
+                "{{#each a.b}}{{#each c}}{{../../d}}{{/each}}{{/each}}",
             )
             .is_ok());
 

src/helpers/helper_if.rs

@@ -14,7 +14,7 @@ pub struct IfHelper {
 impl HelperDef for IfHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,

src/helpers/helper_log.rs

@@ -19,7 +19,7 @@ pub struct LogHelper;
 impl HelperDef for LogHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         _: &'reg Registry<'reg>,
         _: &'rc Context,
         _: &mut RenderContext<'reg, 'rc>,
@@ -59,7 +59,7 @@ impl HelperDef for LogHelper {
 impl HelperDef for LogHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        _: &Helper<'reg, 'rc>,
+        _: &Helper<'rc>,
         _: &Registry<'reg>,
         _: &Context,
         _: &mut RenderContext<'reg, 'rc>,

src/helpers/helper_lookup.rs

@@ -13,11 +13,11 @@ pub struct LookupHelper;
 impl HelperDef for LookupHelper {
     fn call_inner<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         _: &'rc Context,
         _: &mut RenderContext<'reg, 'rc>,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+    ) -> Result<ScopedJson<'rc>, RenderError> {
         let collection_value = h
             .param(0)
             .ok_or_else(|| RenderError::new("Param not found for helper \"lookup\""))?;

src/helpers/helper_raw.rs

@@ -10,7 +10,7 @@ pub struct RawHelper;
 impl HelperDef for RawHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,

src/helpers/helper_with.rs

@@ -14,7 +14,7 @@ pub struct WithHelper;
 impl HelperDef for WithHelper {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,

src/helpers/mod.rs

@@ -32,7 +32,7 @@ pub type HelperResult = Result<(), RenderError>;
 /// ```
 /// use handlebars::*;
 ///
-/// fn upper(h: &Helper<'_, '_>, _: &Handlebars<'_>, _: &Context, rc:
+/// fn upper(h: &Helper< '_>, _: &Handlebars<'_>, _: &Context, rc:
 /// &mut RenderContext<'_, '_>, out: &mut dyn Output)
 ///     -> HelperResult {
 ///    // get parameter from helper or throw an error
@@ -50,7 +50,7 @@ pub type HelperResult = Result<(), RenderError>;
 /// use handlebars::*;
 ///
 /// fn dummy_block<'reg, 'rc>(
-///     h: &Helper<'reg, 'rc>,
+///     h: &Helper<'rc>,
 ///     r: &'reg Handlebars<'reg>,
 ///     ctx: &'rc Context,
 ///     rc: &mut RenderContext<'reg, 'rc>,
@@ -90,11 +90,11 @@ pub trait HelperDef {
     /// helpers like `if` and rendered as empty string.
     fn call_inner<'reg: 'rc, 'rc>(
         &self,
-        _: &Helper<'reg, 'rc>,
+        _: &Helper<'rc>,
         _: &'reg Registry<'reg>,
         _: &'rc Context,
         _: &mut RenderContext<'reg, 'rc>,
-    ) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
+    ) -> Result<ScopedJson<'rc>, RenderError> {
         Err(RenderError::unimplemented())
     }
 
@@ -113,7 +113,7 @@ pub trait HelperDef {
     /// So it is not recommended to use these helpers in subexpression.
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,
@@ -145,7 +145,7 @@ pub trait HelperDef {
 /// implement HelperDef for bare function so we can use function as helper
 impl<
         F: for<'reg, 'rc> Fn(
-            &Helper<'reg, 'rc>,
+            &Helper<'rc>,
             &'reg Registry<'reg>,
             &'rc Context,
             &mut RenderContext<'reg, 'rc>,
@@ -155,7 +155,7 @@ impl<
 {
     fn call<'reg: 'rc, 'rc>(
         &self,
-        h: &Helper<'reg, 'rc>,
+        h: &Helper<'rc>,
         r: &'reg Registry<'reg>,
         ctx: &'rc Context,
         rc: &mut RenderContext<'reg, 'rc>,
@@ -200,7 +200,7 @@ mod test {
     impl HelperDef for MetaHelper {
         fn call<'reg: 'rc, 'rc>(
             &self,
-            h: &Helper<'reg, 'rc>,
+            h: &Helper<'rc>,
             r: &'reg Registry<'reg>,
             ctx: &'rc Context,
             rc: &mut RenderContext<'reg, 'rc>,
@@ -248,7 +248,7 @@ mod test {
         handlebars.register_helper(
             "helperMissing",
             Box::new(
-                |h: &Helper<'_, '_>,
+                |h: &Helper<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  _: &mut RenderContext<'_, '_>,
@@ -262,7 +262,7 @@ mod test {
         handlebars.register_helper(
             "foo",
             Box::new(
-                |h: &Helper<'_, '_>,
+                |h: &Helper<'_>,
                  _: &Registry<'_>,
                  _: &Context,
                  _: &mut RenderContext<'_, '_>,