Struct QueryRewriter 

pub struct QueryRewriter { /* private fields */ }

Query rewriter engine

Implementations

impl QueryRewriter

pub fn new(config: QueryRewriterConfig) -> Self

Create a new query rewriter with the given configuration.

pub fn add_rule(&mut self, rule: RewriteRule) -> Result<(), String>

Add a rewrite rule. Returns an error if the max rules limit is reached.

pub fn add_synonym(&mut self, word: &str, synonym: &str, boost: f64)

Add a synonym mapping with a boost factor.

pub fn add_stop_word(&mut self, word: &str)

Add a stop word.

pub fn rewrite(&mut self, query: &str) -> RewriteResult

Rewrite a query, applying all enabled rules, synonym expansion, stemming, and stop word removal.

pub fn tokenize(query: &str) -> Vec<String>

Tokenize a query string: split on whitespace, lowercase, remove non-alphanumeric chars.

pub fn apply_stemming(word: &str) -> String

Simple suffix-stripping stemmer (Porter-like). Handles: -ing, -ed, -ly, -tion, -ness, -ment

pub fn is_stop_word(&self, word: &str) -> bool

Check if a word is a stop word.

pub fn expand_synonyms(&self, term: &str) -> Vec<(String, f64)>

Expand a term into its synonyms with associated boost values.

pub fn rules_count(&self) -> usize

Return the number of rules.

pub fn remove_rule(&mut self, pattern: &str) -> bool

Remove all rules matching the given pattern. Returns true if any were removed.

pub fn clear_rules(&mut self)

Clear all rules.

pub fn stats(&self) -> &QueryRewriterStats

Get current statistics.

pub fn normalize_query(query: &str) -> String

Normalize a query: lowercase, trim, collapse multiple whitespace into single space.