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|
/// Macro that allows you to quickly define a handlebars helper by passing a
/// name and a closure.
///
/// There are several types of arguments available to closure:
///
/// * Parameters are mapped to closure arguments one by one. Any declared
/// parameters are required
/// * Hash are mapped as named arguments and declared in a bracket block.
/// All named arguments are optional so default value is required.
/// * An optional `*args` provides a vector of all helper parameters.
/// * An optional `**kwargs` provides a map of all helper hash.
///
/// # Examples
///
/// ```rust
/// #[macro_use] extern crate handlebars;
/// #[macro_use] extern crate serde_json;
///
/// handlebars_helper!(is_above_10: |x: u64| x > 10);
/// handlebars_helper!(is_above: |x: u64, { compare: u64 = 10 }| x > compare);
///
/// # fn main() {
/// #
/// let mut handlebars = handlebars::Handlebars::new();
/// handlebars.register_helper("is-above-10", Box::new(is_above_10));
/// handlebars.register_helper("is-above", Box::new(is_above));
///
/// let result = handlebars
/// .render_template("{{#if (is-above-10 12)}}great!{{else}}okay{{/if}}", &json!({}))
/// .unwrap();
/// assert_eq!(&result, "great!");
/// let result2 = handlebars
/// .render_template("{{#if (is-above 12 compare=10)}}great!{{else}}okay{{/if}}", &json!({}))
/// .unwrap();
/// assert_eq!(&result2, "great!");
/// # }
/// ```
#[macro_export]
macro_rules! handlebars_helper {
($struct_name:ident: |$($name:ident: $tpe:tt$(<$($gen:ty),+>)?),*
$($(,)?{$($hash_name:ident: $hash_tpe:tt=$dft_val:literal),*})?
$($(,)?*$args:ident)?
$($(,)?**$kwargs:ident)?|
$body:expr ) => {
#[allow(non_camel_case_types)]
pub struct $struct_name;
impl $crate::HelperDef for $struct_name {
#[allow(unused_assignments)]
fn call_inner<'reg: 'rc, 'rc>(
&self,
h: &$crate::Helper<'reg, 'rc>,
r: &'reg $crate::Handlebars<'reg>,
_: &'rc $crate::Context,
_: &mut $crate::RenderContext<'reg, 'rc>,
) -> Result<$crate::ScopedJson<'reg, 'rc>, $crate::RenderError> {
let mut param_idx = 0;
$(
let $name = h.param(param_idx)
.and_then(|x| {
if r.strict_mode() && x.is_value_missing() {
None
} else {
Some(x.value())
}
})
.ok_or_else(|| $crate::RenderError::new(&format!(
"`{}` helper: Couldn't read parameter {}",
stringify!($struct_name), stringify!($name),
)))
.and_then(|x|
handlebars_helper!(@as_json_value x, $tpe$(<$($gen),+>)?)
.ok_or_else(|| $crate::RenderError::new(&format!(
"`{}` helper: Couldn't convert parameter {} to type `{}`. \
It's {:?} as JSON. Got these params: {:?}",
stringify!($struct_name), stringify!($name), stringify!($tpe$(<$($gen),+>)?),
x, h.params(),
)))
)?;
param_idx += 1;
)*
$(
$(
let $hash_name = h.hash_get(stringify!($hash_name))
.map(|x| x.value())
.map(|x|
handlebars_helper!(@as_json_value x, $hash_tpe)
.ok_or_else(|| $crate::RenderError::new(&format!(
"`{}` helper: Couldn't convert hash {} to type `{}`. \
It's {:?} as JSON. Got these hash: {:?}",
stringify!($struct_name), stringify!($hash_name), stringify!($hash_tpe),
x, h.hash(),
)))
)
.unwrap_or_else(|| Ok($dft_val))?;
)*
)?
$(let $args = h.params().iter().map(|x| x.value()).collect::<Vec<&serde_json::Value>>();)?
$(let $kwargs = h.hash().iter().map(|(k, v)| (k.to_owned(), v.value())).collect::<std::collections::BTreeMap<&str, &serde_json::Value>>();)?
let result = $body;
Ok($crate::ScopedJson::Derived($crate::JsonValue::from(result)))
}
}
};
(@as_json_value $x:ident, object) => { $x.as_object() };
(@as_json_value $x:ident, array) => { $x.as_array() };
(@as_json_value $x:ident, str) => { $x.as_str() };
(@as_json_value $x:ident, i64) => { $x.as_i64() };
(@as_json_value $x:ident, u64) => { $x.as_u64() };
(@as_json_value $x:ident, f64) => { $x.as_f64() };
(@as_json_value $x:ident, bool) => { $x.as_bool() };
(@as_json_value $x:ident, null) => { $x.as_null() };
(@as_json_value $x:ident, Json) => { Some($x) };
(@as_json_value $x:ident, $tpe:tt$(<$($gen:ty),+>)?) => { serde_json::from_value::<$tpe$(<$($gen),+>)?>($x.clone()).ok() };
}
#[cfg(feature = "no_logging")]
#[macro_use]
#[doc(hidden)]
pub mod logging {
/// This macro is defined if the `logging` feature is set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! debug {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
/// This macro is defined if the `logging` feature is not set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! error {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
/// This macro is defined if the `logging` feature is not set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! info {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
/// This macro is defined if the `logging` feature is not set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! log {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
/// This macro is defined if the `logging` feature is not set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! trace {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
/// This macro is defined if the `logging` feature is not set.
///
/// It ignores all logging calls inside the library.
#[doc(hidden)]
#[macro_export]
macro_rules! warn {
(target: $target:expr, $($arg:tt)*) => {};
($($arg:tt)*) => {};
}
}
|
