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Implement the first and last helpers.

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This commit is contained in:
Tom Alexander 2020-06-07 15:16:39 -04:00
parent fdecdcb53b
commit 417466d17d
Signed by: talexander
GPG Key ID: D3A179C9A53C0EDE
5 changed files with 188 additions and 2 deletions
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23
js/test_cases/helpers_first/input1.json Normal file
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@ -0,0 +1,23 @@
{
"people": [
{
"name": "Alice",
"pet": "cat"
},
{
"name": "Bob",
"pet": "dog"
},
{
"name": "Chris",
"pet": "lizard"
}
],
"toys": [
"ball",
"bone"
],
"scalar": 7,
"name": "global name",
"pet": "global pet"
}

29
js/test_cases/helpers_first/main.dust Normal file
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@ -0,0 +1,29 @@
Tags inside a first{~n}
==================={~n}
{#people}
{name}{@first petname="fluffy"},{pet}{petname}{/first}
{/people}{~n}
first inside a scalar{~n}
====================={~n}
{#scalar}
{name}{@first petname="fluffy"},{pet}{petname}{/first}
{/scalar}{~n}
Nested first inside another non-array section{~n}
============================================={~n}
{#people}
{#toys}
{name}'s pet {pet} plays with a {.}{@first}, {/first}
{/toys}
{/people}{~n}
Else block inside a first{~n}
========================={~n}
{#people}
{name}{@first},{pet}{petname}{:else}elseblock{/first}
{/people}{~n}
Sep outside any section{~n}
======================={~n}
{@first}first is printed outside any section{/first}

23
js/test_cases/helpers_last/input1.json Normal file
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@ -0,0 +1,23 @@
{
"people": [
{
"name": "Alice",
"pet": "cat"
},
{
"name": "Bob",
"pet": "dog"
},
{
"name": "Chris",
"pet": "lizard"
}
],
"toys": [
"ball",
"bone"
],
"scalar": 7,
"name": "global name",
"pet": "global pet"
}

29
js/test_cases/helpers_last/main.dust Normal file
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@ -0,0 +1,29 @@
Tags inside a last{~n}
=================={~n}
{#people}
{name}{@last petname="fluffy"},{pet}{petname}{/last}
{/people}{~n}
last inside a scalar{~n}
===================={~n}
{#scalar}
{name}{@last petname="fluffy"},{pet}{petname}{/last}
{/scalar}{~n}
Nested last inside another non-array section{~n}
============================================{~n}
{#people}
{#toys}
{name}'s pet {pet} plays with a {.}{@last}, {/last}
{/toys}
{/people}{~n}
Else block inside a last{~n}
========================{~n}
{#people}
{name}{@last},{pet}{petname}{:else}elseblock{/last}
{/people}{~n}
Sep outside any section{~n}
======================={~n}
{@last}last is printed outside any section{/last}

86
src/renderer/renderer.rs
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@ -694,8 +694,90 @@ impl<'a> DustRenderer<'a> {
}
}
}
DustTag::DTHelperFirst(parameterized_block) => {}
DustTag::DTHelperLast(parameterized_block) => {}
DustTag::DTHelperFirst(parameterized_block) => {
let new_breadcrumbs = self.new_breadcrumbs_partial(
breadcrumbs,
breadcrumbs,
None,
&parameterized_block.explicit_context,
);
let index = self.get(breadcrumbs, &vec!["$idx"]);
let len = self.get(breadcrumbs, &vec!["$len"]);
match (index, len) {
(Err(_), _) | (_, Err(_)) => return Ok("".to_owned()),
(Ok(index_resolved), Ok(len_resolved)) => {
// Iteration contexts use OwnedLiteral::LPositiveinteger
let index_cast = index_resolved
.get_context_element_reference()
.to_any()
.downcast_ref::<OwnedLiteral>();
let len_cast = len_resolved
.get_context_element_reference()
.to_any()
.downcast_ref::<OwnedLiteral>();
match (index_cast, len_cast) {
(
Some(OwnedLiteral::LPositiveInteger(index_number)),
Some(OwnedLiteral::LPositiveInteger(len_number)),
) => {
if *index_number != 0 {
return Ok("".to_owned());
} else {
return self.render_maybe_body(
&parameterized_block.contents,
new_breadcrumbs.as_ref().unwrap_or(breadcrumbs),
blocks,
);
}
}
_ => return Ok("".to_owned()),
}
}
}
}
DustTag::DTHelperLast(parameterized_block) => {
let new_breadcrumbs = self.new_breadcrumbs_partial(
breadcrumbs,
breadcrumbs,
None,
&parameterized_block.explicit_context,
);
let index = self.get(breadcrumbs, &vec!["$idx"]);
let len = self.get(breadcrumbs, &vec!["$len"]);
match (index, len) {
(Err(_), _) | (_, Err(_)) => return Ok("".to_owned()),
(Ok(index_resolved), Ok(len_resolved)) => {
// Iteration contexts use OwnedLiteral::LPositiveinteger
let index_cast = index_resolved
.get_context_element_reference()
.to_any()
.downcast_ref::<OwnedLiteral>();
let len_cast = len_resolved
.get_context_element_reference()
.to_any()
.downcast_ref::<OwnedLiteral>();
match (index_cast, len_cast) {
(
Some(OwnedLiteral::LPositiveInteger(index_number)),
Some(OwnedLiteral::LPositiveInteger(len_number)),
) => {
if *index_number != len_number - 1 {
return Ok("".to_owned());
} else {
return self.render_maybe_body(
&parameterized_block.contents,
new_breadcrumbs.as_ref().unwrap_or(breadcrumbs),
blocks,
);
}
}
_ => return Ok("".to_owned()),
}
}
}
}
}
Ok("".to_owned())