Add field_boosts and fuzzy_fields optional parameters to Index::parse…

…_query (#202)

src/document.rs

@@ -125,7 +125,7 @@ pub(crate) fn extract_value_for_type(
 
             Value::JsonObject(
                 any.downcast::<PyDict>()
-                    .map(|dict| pythonize::depythonize(&dict))
+                    .map(|dict| pythonize::depythonize(dict))
                     .map_err(to_pyerr_for_type("Json", field_name, any))?
                     .map_err(to_pyerr_for_type("Json", field_name, any))?,
             )

src/index.rs

@@ -1,5 +1,7 @@
 #![allow(clippy::new_ret_no_self)]
 
+use std::collections::HashMap;
+
 use pyo3::{exceptions, prelude::*, types::PyAny};
 
 use crate::{
@@ -358,44 +360,33 @@ impl Index {
     ///
     /// Args:
     ///     query: the query, following the tantivy query language.
+    ///
     ///     default_fields_names (List[Field]): A list of fields used to search if no
     ///         field is specified in the query.
     ///
-    #[pyo3(signature = (query, default_field_names = None))]
+    ///     field_boosts: A dictionary keyed on field names which provides default boosts
+    ///         for the query constructed by this method.
+    ///
+    ///     fuzzy_fields: A dictionary keyed on field names which provides (prefix, distance, transpose_cost_one)
+    ///         triples making queries constructed by this method fuzzy against the given fields
+    ///         and using the given parameters.
+    ///         `prefix` determines if terms which are prefixes of the given term match the query.
+    ///         `distance` determines the maximum Levenshtein distance between terms matching the query and the given term.
+    ///         `transpose_cost_one` determines if transpositions of neighbouring characters are counted only once against the Levenshtein distance.
+    #[pyo3(signature = (query, default_field_names = None, field_boosts = HashMap::new(), fuzzy_fields = HashMap::new()))]
     pub fn parse_query(
         &self,
         query: &str,
         default_field_names: Option<Vec<String>>,
+        field_boosts: HashMap<String, tv::Score>,
+        fuzzy_fields: HashMap<String, (bool, u8, bool)>,
     ) -> PyResult<Query> {
-        let mut default_fields = vec![];
-        let schema = self.index.schema();
-        if let Some(default_field_names_vec) = default_field_names {
-            for default_field_name in &default_field_names_vec {
-                if let Ok(field) = schema.get_field(default_field_name) {
-                    let field_entry = schema.get_field_entry(field);
-                    if !field_entry.is_indexed() {
-                        return Err(exceptions::PyValueError::new_err(
-                            format!(
-                            "Field `{default_field_name}` is not set as indexed in the schema."
-                        ),
-                        ));
-                    }
-                    default_fields.push(field);
-                } else {
-                    return Err(exceptions::PyValueError::new_err(format!(
-                        "Field `{default_field_name}` is not defined in the schema."
-                    )));
-                }
-            }
-        } else {
-            for (field, field_entry) in self.index.schema().fields() {
-                if field_entry.is_indexed() {
-                    default_fields.push(field);
-                }
-            }
-        }
-        let parser =
-            tv::query::QueryParser::for_index(&self.index, default_fields);
+        let parser = self.prepare_query_parser(
+            default_field_names,
+            field_boosts,
+            fuzzy_fields,
+        )?;
+
         let query = parser.parse_query(query).map_err(to_pyerr)?;
 
         Ok(Query { inner: query })
@@ -410,64 +401,106 @@ impl Index {
     ///
     /// Args:
     ///     query: the query, following the tantivy query language.
+    ///
     ///     default_fields_names (List[Field]): A list of fields used to search if no
     ///         field is specified in the query.
     ///
+    ///     field_boosts: A dictionary keyed on field names which provides default boosts
+    ///         for the query constructed by this method.
+    ///
+    ///     fuzzy_fields: A dictionary keyed on field names which provides (prefix, distance, transpose_cost_one)
+    ///         triples making queries constructed by this method fuzzy against the given fields
+    ///         and using the given parameters.
+    ///         `prefix` determines if terms which are prefixes of the given term match the query.
+    ///         `distance` determines the maximum Levenshtein distance between terms matching the query and the given term.
+    ///         `transpose_cost_one` determines if transpositions of neighbouring characters are counted only once against the Levenshtein distance.
+    ///
     /// Returns a tuple containing the parsed query and a list of errors.
     ///
     /// Raises ValueError if a field in `default_field_names` is not defined or marked as indexed.
-    #[pyo3(signature = (query, default_field_names = None))]
+    #[pyo3(signature = (query, default_field_names = None, field_boosts = HashMap::new(), fuzzy_fields = HashMap::new()))]
     pub fn parse_query_lenient(
         &self,
         query: &str,
         default_field_names: Option<Vec<String>>,
+        field_boosts: HashMap<String, tv::Score>,
+        fuzzy_fields: HashMap<String, (bool, u8, bool)>,
+        py: Python,
     ) -> PyResult<(Query, Vec<PyObject>)> {
+        let parser = self.prepare_query_parser(
+            default_field_names,
+            field_boosts,
+            fuzzy_fields,
+        )?;
+
+        let (query, errors) = parser.parse_query_lenient(query);
+        let errors = errors.into_iter().map(|err| err.into_py(py)).collect();
+
+        Ok((Query { inner: query }, errors))
+    }
+}
+
+impl Index {
+    fn prepare_query_parser(
+        &self,
+        default_field_names: Option<Vec<String>>,
+        field_boosts: HashMap<String, tv::Score>,
+        fuzzy_fields: HashMap<String, (bool, u8, bool)>,
+    ) -> PyResult<tv::query::QueryParser> {
         let schema = self.index.schema();
 
-        let default_fields = if let Some(default_field_names_vec) =
+        let default_fields = if let Some(default_field_names) =
             default_field_names
         {
-            default_field_names_vec
-                .iter()
-                .map(|field_name| {
-                    schema
-                        .get_field(field_name)
-                        .map_err(|_err| {
-                            exceptions::PyValueError::new_err(format!(
-                                "Field `{field_name}` is not defined in the schema."
-                            ))
-                        })
-                        .and_then(|field| {
-                            schema.get_field_entry(field).is_indexed().then_some(field).ok_or(
-                                exceptions::PyValueError::new_err(
-                                    format!(
-                                        "Field `{field_name}` is not set as indexed in the schema."
-                                    ),
-                                ))
-                        })
-                }).collect::<Result<Vec<_>, _>>()?
+            default_field_names.iter().map(|field_name| {
+                let field = schema.get_field(field_name).map_err(|_err| {
+                    exceptions::PyValueError::new_err(format!(
+                        "Field `{field_name}` is not defined in the schema."
+                    ))
+                })?;
+
+                let field_entry = schema.get_field_entry(field);
+                if !field_entry.is_indexed() {
+                    return Err(exceptions::PyValueError::new_err(
+                        format!("Field `{field_name}` is not set as indexed in the schema.")
+                    ));
+                }
+
+                Ok(field)
+            }).collect::<PyResult<_>>()?
         } else {
-            self.index
-                .schema()
+            schema
                 .fields()
-                .filter_map(|(f, fe)| fe.is_indexed().then_some(f))
-                .collect::<Vec<_>>()
+                .filter(|(_, field_entry)| field_entry.is_indexed())
+                .map(|(field, _)| field)
+                .collect()
         };
 
-        let parser =
+        let mut parser =
             tv::query::QueryParser::for_index(&self.index, default_fields);
-        let (query, errors) = parser.parse_query_lenient(query);
 
-        Python::with_gil(|py| {
-            let errors =
-                errors.into_iter().map(|err| err.into_py(py)).collect();
+        for (field_name, boost) in field_boosts {
+            let field = schema.get_field(&field_name).map_err(|_err| {
+                exceptions::PyValueError::new_err(format!(
+                    "Field `{field_name}` is not defined in the schema."
+                ))
+            })?;
+            parser.set_field_boost(field, boost);
+        }
 
-            Ok((Query { inner: query }, errors))
-        })
+        for (field_name, (prefix, distance, transpose_cost_one)) in fuzzy_fields
+        {
+            let field = schema.get_field(&field_name).map_err(|_err| {
+                exceptions::PyValueError::new_err(format!(
+                    "Field `{field_name}` is not defined in the schema."
+                ))
+            })?;
+            parser.set_field_fuzzy(field, prefix, distance, transpose_cost_one);
+        }
+
+        Ok(parser)
     }
-}
 
-impl Index {
     fn register_custom_text_analyzers(index: &tv::Index) {
         let analyzers = [
             ("ar_stem", Language::Arabic),

src/parser_error.rs

@@ -304,10 +304,7 @@ impl ExpectedBase64Error {
     /// If `true`, an invalid byte was found in the query. Padding characters (`=`) interspersed in
     /// the encoded form will be treated as invalid bytes.
     fn caused_by_invalid_byte(&self) -> bool {
-        match self.decode_error {
-            base64::DecodeError::InvalidByte { .. } => true,
-            _ => false,
-        }
+        matches!(self.decode_error, base64::DecodeError::InvalidByte { .. })
     }
 
     /// If the error was caused by an invalid byte, returns the offset and offending byte.
@@ -322,19 +319,16 @@ impl ExpectedBase64Error {
 
     /// If `true`, the length of the base64 string was invalid.
     fn caused_by_invalid_length(&self) -> bool {
-        match self.decode_error {
-            base64::DecodeError::InvalidLength => true,
-            _ => false,
-        }
+        matches!(self.decode_error, base64::DecodeError::InvalidLength)
     }
 
     /// The last non-padding input symbol's encoded 6 bits have nonzero bits that will be discarded.
     /// If `true`, this is indicative of corrupted or truncated Base64.
     fn caused_by_invalid_last_symbol(&self) -> bool {
-        match self.decode_error {
-            base64::DecodeError::InvalidLastSymbol { .. } => true,
-            _ => false,
-        }
+        matches!(
+            self.decode_error,
+            base64::DecodeError::InvalidLastSymbol { .. }
+        )
     }
 
     /// If the error was caused by an invalid last symbol, returns the offset and offending byte.
@@ -350,10 +344,7 @@ impl ExpectedBase64Error {
     /// The nature of the padding was not as configured: absent or incorrect when it must be
     /// canonical, or present when it must be absent, etc.
     fn caused_by_invalid_padding(&self) -> bool {
-        match self.decode_error {
-            base64::DecodeError::InvalidPadding => true,
-            _ => false,
-        }
+        matches!(self.decode_error, base64::DecodeError::InvalidPadding)
     }
 
     fn __repr__(&self) -> String {

src/snippet.rs

@@ -62,10 +62,10 @@ impl SnippetGenerator {
             tv::SnippetGenerator::create(&searcher.inner, query.get(), field)
                 .map_err(to_pyerr)?;
 
-        return Ok(SnippetGenerator {
+        Ok(SnippetGenerator {
             field_name: field_name.to_string(),
             inner: generator,
-        });
+        })
     }
 
     pub fn snippet_from_doc(&self, doc: &crate::Document) -> crate::Snippet {

tests/tantivy_test.py

@@ -94,6 +94,20 @@ def test_and_query_parser_default_fields_undefined(self, ram_index):
             == """Query(BooleanQuery { subqueries: [(Should, TermQuery(Term(field=0, type=Str, "winter"))), (Should, TermQuery(Term(field=1, type=Str, "winter")))] })"""
         )
 
+    def test_parse_query_field_boosts(self, ram_index):
+        query = ram_index.parse_query("winter", field_boosts={"title": 2.3})
+        assert (
+            repr(query)
+            == """Query(BooleanQuery { subqueries: [(Should, Boost(query=TermQuery(Term(field=0, type=Str, "winter")), boost=2.3)), (Should, TermQuery(Term(field=1, type=Str, "winter")))] })"""
+        )
+
+    def test_parse_query_field_boosts(self, ram_index):
+        query = ram_index.parse_query("winter", fuzzy_fields={"title": (True, 1, False)})
+        assert (
+            repr(query)
+            == """Query(BooleanQuery { subqueries: [(Should, FuzzyTermQuery { term: Term(field=0, type=Str, "winter"), distance: 1, transposition_cost_one: false, prefix: true }), (Should, TermQuery(Term(field=1, type=Str, "winter")))] })"""
+        )
+
     def test_query_errors(self, ram_index):
         index = ram_index
         # no "bod" field