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//! Defines the pipeline which processes text for inclusion in the index. Most users do not need
//! to use this module directly.
use serde::ser::{Serialize, SerializeSeq, Serializer};
pub trait PipelineFn {
fn name(&self) -> String;
fn filter(&self, token: String) -> Option<String>;
}
#[derive(Clone)]
pub struct FnWrapper(pub String, pub fn(String) -> Option<String>);
impl PipelineFn for FnWrapper {
fn name(&self) -> String {
self.0.clone()
}
fn filter(&self, token: String) -> Option<String> {
(self.1)(token)
}
}
/// A sequence of `PipelineFn`s which are run on tokens to prepare them for searching.
#[derive(Deserialize)]
pub struct Pipeline {
#[serde(skip_deserializing)]
pub queue: Vec<Box<dyn PipelineFn>>,
}
impl Serialize for Pipeline {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut seq = serializer.serialize_seq(Some(self.queue.len()))?;
for elem in &self.queue {
seq.serialize_element(&elem.name())?;
}
seq.end()
}
}
impl Pipeline {
/// Run the Pipeline against the given vector of tokens. The returned vector may be shorter
/// than the input if a pipeline function returns `None` for a token.
pub fn run(&self, tokens: Vec<String>) -> Vec<String> {
let mut ret = vec![];
for token in tokens {
let mut token = Some(token);
for func in &self.queue {
if let Some(t) = token {
token = func.filter(t);
} else {
break;
}
}
if let Some(t) = token {
ret.push(t);
}
}
ret
}
}
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