Struct handlebars::Helper [−][src]
pub struct Helper<'reg: 'rc, 'rc> { /* fields omitted */ }
Methods
impl<'reg: 'rc, 'rc> Helper<'reg, 'rc>
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impl<'reg: 'rc, 'rc> Helper<'reg, 'rc>
pub fn name(&self) -> &'reg str
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pub fn name(&self) -> &'reg str
Returns helper name
pub fn params(&self) -> &Vec<PathAndJson<'reg, 'rc>>
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pub fn params(&self) -> &Vec<PathAndJson<'reg, 'rc>>
Returns all helper params, resolved within the context
pub fn param(&self, idx: usize) -> Option<&PathAndJson<'reg, 'rc>>
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pub fn param(&self, idx: usize) -> Option<&PathAndJson<'reg, 'rc>>
Returns nth helper param, resolved within the context.
Example
To get the first param in {{my_helper abc}}
or {{my_helper 2}}
,
use h.param(0)
in helper definition.
Variable abc
is auto resolved in current context.
use handlebars::*; fn my_helper(h: &Helper, rc: &mut RenderContext) -> Result<(), RenderError> { let v = h.param(0).map(|v| v.value()) .ok_or(RenderError::new("param not found")); // .. Ok(()) }
pub fn hash(&self) -> &BTreeMap<String, PathAndJson<'reg, 'rc>>
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pub fn hash(&self) -> &BTreeMap<String, PathAndJson<'reg, 'rc>>
Returns hash, resolved within the context
pub fn hash_get(&self, key: &str) -> Option<&PathAndJson<'reg, 'rc>>
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pub fn hash_get(&self, key: &str) -> Option<&PathAndJson<'reg, 'rc>>
Return hash value of a given key, resolved within the context
Example
To get the first param in {{my_helper v=abc}}
or {{my_helper v=2}}
,
use h.hash_get("v")
in helper definition.
Variable abc
is auto resolved in current context.
use handlebars::*; fn my_helper(h: &Helper, rc: &mut RenderContext) -> Result<(), RenderError> { let v = h.hash_get("v").map(|v| v.value()) .ok_or(RenderError::new("param not found")); // .. Ok(()) }
pub fn template(&self) -> Option<&'reg Template>
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pub fn template(&self) -> Option<&'reg Template>
Returns the default inner template if the helper is a block helper.
Typically you will render the template via: template.render(registry, render_context)
pub fn inverse(&self) -> Option<&'reg Template>
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pub fn inverse(&self) -> Option<&'reg Template>
Returns the template of else
branch if any
pub fn is_block(&self) -> bool
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pub fn is_block(&self) -> bool
Returns if the helper is a block one {{#helper}}{{/helper}}
or not {{helper 123}}
pub fn block_param(&self) -> Option<&str>
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pub fn block_param(&self) -> Option<&str>
Returns block param if any
pub fn block_param_pair(&self) -> Option<(&str, &str)>
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pub fn block_param_pair(&self) -> Option<(&str, &str)>
Return block param pair (for example |key, val|) if any