Merge #403

403: Revert "Replacing pest with nom" r=curquiza a=curquiza

Reverts meilisearch/milli#358

Co-authored-by: Clémentine Urquizar <clementine@meilisearch.com>

milli/Cargo.toml

@@ -39,7 +39,8 @@ tempfile = "3.2.0"
 uuid = { version = "0.8.2", features = ["v4"] }
 
 # facet filter parser
-nom = "7.0.0"
+pest = { git = "https://github.com/pest-parser/pest.git", rev = "51fd1d49f1041f7839975664ef71fe15c7dcaf67" }
+pest_derive = "2.1.0"
 
 # documents words self-join
 itertools = "0.10.0"

milli/src/error.rs

@@ -7,6 +7,7 @@ use heed::{Error as HeedError, MdbError};
 use rayon::ThreadPoolBuildError;
 use serde_json::{Map, Value};
 
+use crate::search::ParserRule;
 use crate::{CriterionError, DocumentId, FieldId, SortError};
 
 pub type Object = Map<String, Value>;
@@ -58,9 +59,9 @@ pub enum UserError {
     DocumentLimitReached,
     InvalidDocumentId { document_id: Value },
     InvalidFacetsDistribution { invalid_facets_name: HashSet<String> },
+    InvalidFilter(pest::error::Error<ParserRule>),
+    InvalidFilterAttribute(pest::error::Error<ParserRule>),
     InvalidGeoField { document_id: Value, object: Value },
-    InvalidFilter { input: String },
-    InvalidSortName { name: String },
     InvalidSortableAttribute { field: String, valid_fields: HashSet<String> },
     SortRankingRuleMissing,
     InvalidStoreFile,
@@ -207,7 +208,6 @@ impl StdError for InternalError {}
 impl fmt::Display for UserError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
-            Self::InvalidFilter { input } => write!(f, "parser error {}", input),
             Self::AttributeLimitReached => f.write_str("maximum number of attributes reached"),
             Self::CriterionError(error) => write!(f, "{}", error),
             Self::DocumentLimitReached => f.write_str("maximum number of documents reached"),
@@ -220,6 +220,7 @@ impl fmt::Display for UserError {
                     name_list
                 )
             }
+            Self::InvalidFilter(error) => error.fmt(f),
             Self::InvalidGeoField { document_id, object } => write!(
                 f,
                 "the document with the id: {} contains an invalid _geo field: {}",
@@ -235,9 +236,7 @@ only composed of alphanumeric characters (a-z A-Z 0-9), hyphens (-) and undersco
                     json
                 )
             }
-            Self::InvalidSortName { name } => {
-                write!(f, "Invalid syntax for the sort parameter: {}", name)
-            }
+            Self::InvalidFilterAttribute(error) => error.fmt(f),
             Self::InvalidSortableAttribute { field, valid_fields } => {
                 let valid_names =
                     valid_fields.iter().map(AsRef::as_ref).collect::<Vec<_>>().join(", ");

milli/src/lib.rs

@@ -1,3 +1,6 @@
+#[macro_use]
+extern crate pest_derive;
+
 #[macro_use]
 pub mod documents;
 

milli/src/search/facet/filter_condition.rs

@@ -1,20 +1,60 @@
+use std::collections::HashSet;
 use std::fmt::Debug;
 use std::ops::Bound::{self, Excluded, Included};
+use std::result::Result as StdResult;
+use std::str::FromStr;
 
 use either::Either;
 use heed::types::DecodeIgnore;
+use itertools::Itertools;
 use log::debug;
-use nom::error::{convert_error, VerboseError};
+use pest::error::{Error as PestError, ErrorVariant};
+use pest::iterators::{Pair, Pairs};
+use pest::Parser;
 use roaring::RoaringBitmap;
 
 use self::FilterCondition::*;
-use super::filter_parser::{Operator, ParseContext};
+use self::Operator::*;
+use super::parser::{FilterParser, Rule, PREC_CLIMBER};
 use super::FacetNumberRange;
-use crate::error::{Error, UserError};
+use crate::error::UserError;
 use crate::heed_codec::facet::{
     FacetLevelValueF64Codec, FacetStringLevelZeroCodec, FacetStringLevelZeroValueCodec,
 };
-use crate::{distance_between_two_points, CboRoaringBitmapCodec, FieldId, Index, Result};
+use crate::{
+    distance_between_two_points, CboRoaringBitmapCodec, FieldId, FieldsIdsMap, Index, Result,
+};
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum Operator {
+    GreaterThan(f64),
+    GreaterThanOrEqual(f64),
+    Equal(Option<f64>, String),
+    NotEqual(Option<f64>, String),
+    LowerThan(f64),
+    LowerThanOrEqual(f64),
+    Between(f64, f64),
+    GeoLowerThan([f64; 2], f64),
+    GeoGreaterThan([f64; 2], f64),
+}
+
+impl Operator {
+    /// This method can return two operations in case it must express
+    /// an OR operation for the between case (i.e. `TO`).
+    fn negate(self) -> (Self, Option<Self>) {
+        match self {
+            GreaterThan(n) => (LowerThanOrEqual(n), None),
+            GreaterThanOrEqual(n) => (LowerThan(n), None),
+            Equal(n, s) => (NotEqual(n, s), None),
+            NotEqual(n, s) => (Equal(n, s), None),
+            LowerThan(n) => (GreaterThanOrEqual(n), None),
+            LowerThanOrEqual(n) => (GreaterThan(n), None),
+            Between(n, m) => (LowerThan(n), Some(GreaterThan(m))),
+            GeoLowerThan(point, distance) => (GeoGreaterThan(point, distance), None),
+            GeoGreaterThan(point, distance) => (GeoLowerThan(point, distance), None),
+        }
+    }
+}
 
 #[derive(Debug, Clone, PartialEq)]
 pub enum FilterCondition {
@@ -36,7 +76,7 @@ impl FilterCondition {
         A: AsRef<str>,
         B: AsRef<str>,
     {
-        let mut ands: Option<FilterCondition> = None;
+        let mut ands = None;
 
         for either in array {
             match either {
@@ -77,23 +117,41 @@ impl FilterCondition {
     ) -> Result<FilterCondition> {
         let fields_ids_map = index.fields_ids_map(rtxn)?;
         let filterable_fields = index.filterable_fields(rtxn)?;
-        let ctx =
-            ParseContext { fields_ids_map: &fields_ids_map, filterable_fields: &filterable_fields };
-        match ctx.parse_expression::<VerboseError<&str>>(expression) {
-            Ok((_, fc)) => Ok(fc),
-            Err(e) => {
-                let ve = match e {
-                    nom::Err::Error(x) => x,
-                    nom::Err::Failure(x) => x,
-                    _ => unreachable!(),
-                };
-                Err(Error::UserError(UserError::InvalidFilter {
-                    input: convert_error(expression, ve).to_string(),
-                }))
-            }
-        }
+        let lexed =
+            FilterParser::parse(Rule::prgm, expression).map_err(UserError::InvalidFilter)?;
+        FilterCondition::from_pairs(&fields_ids_map, &filterable_fields, lexed)
     }
-    pub fn negate(self) -> FilterCondition {
+
+    fn from_pairs(
+        fim: &FieldsIdsMap,
+        ff: &HashSet<String>,
+        expression: Pairs<Rule>,
+    ) -> Result<Self> {
+        PREC_CLIMBER.climb(
+            expression,
+            |pair: Pair<Rule>| match pair.as_rule() {
+                Rule::greater => Ok(Self::greater_than(fim, ff, pair)?),
+                Rule::geq => Ok(Self::greater_than_or_equal(fim, ff, pair)?),
+                Rule::eq => Ok(Self::equal(fim, ff, pair)?),
+                Rule::neq => Ok(Self::equal(fim, ff, pair)?.negate()),
+                Rule::leq => Ok(Self::lower_than_or_equal(fim, ff, pair)?),
+                Rule::less => Ok(Self::lower_than(fim, ff, pair)?),
+                Rule::between => Ok(Self::between(fim, ff, pair)?),
+                Rule::geo_radius => Ok(Self::geo_radius(fim, ff, pair)?),
+                Rule::not => Ok(Self::from_pairs(fim, ff, pair.into_inner())?.negate()),
+                Rule::prgm => Self::from_pairs(fim, ff, pair.into_inner()),
+                Rule::term => Self::from_pairs(fim, ff, pair.into_inner()),
+                _ => unreachable!(),
+            },
+            |lhs: Result<Self>, op: Pair<Rule>, rhs: Result<Self>| match op.as_rule() {
+                Rule::or => Ok(Or(Box::new(lhs?), Box::new(rhs?))),
+                Rule::and => Ok(And(Box::new(lhs?), Box::new(rhs?))),
+                _ => unreachable!(),
+            },
+        )
+    }
+
+    fn negate(self) -> FilterCondition {
         match self {
             Operator(fid, op) => match op.negate() {
                 (op, None) => Operator(fid, op),
@@ -104,6 +162,189 @@ impl FilterCondition {
             Empty => Empty,
         }
     }
+
+    fn geo_radius(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        if !filterable_fields.contains("_geo") {
+            return Err(UserError::InvalidFilterAttribute(PestError::new_from_span(
+                ErrorVariant::CustomError {
+                    message: format!(
+                    "attribute `_geo` is not filterable, available filterable attributes are: {}",
+                    filterable_fields.iter().join(", "),
+                ),
+                },
+                item.as_span(),
+            )))?;
+        }
+        let mut items = item.into_inner();
+        let fid = match fields_ids_map.id("_geo") {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+        let parameters_item = items.next().unwrap();
+        // We don't need more than 3 parameters, but to handle errors correctly we are still going
+        // to extract the first 4 parameters
+        let param_span = parameters_item.as_span();
+        let parameters = parameters_item
+            .into_inner()
+            .take(4)
+            .map(|param| (param.clone(), param.as_span()))
+            .map(|(param, span)| pest_parse(param).0.map(|arg| (arg, span)))
+            .collect::<StdResult<Vec<(f64, _)>, _>>()
+            .map_err(UserError::InvalidFilter)?;
+        if parameters.len() != 3 {
+            return Err(UserError::InvalidFilter(PestError::new_from_span(
+                        ErrorVariant::CustomError {
+                            message: format!("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"),
+                        },
+                        // we want to point to the last parameters and if there was no parameters we
+                        // point to the parenthesis
+                        parameters.last().map(|param| param.1.clone()).unwrap_or(param_span),
+            )))?;
+        }
+        let (lat, lng, distance) = (&parameters[0], &parameters[1], parameters[2].0);
+        if !(-90.0..=90.0).contains(&lat.0) {
+            return Err(UserError::InvalidFilter(PestError::new_from_span(
+                ErrorVariant::CustomError {
+                    message: format!("Latitude must be contained between -90 and 90 degrees."),
+                },
+                lat.1.clone(),
+            )))?;
+        } else if !(-180.0..=180.0).contains(&lng.0) {
+            return Err(UserError::InvalidFilter(PestError::new_from_span(
+                ErrorVariant::CustomError {
+                    message: format!("Longitude must be contained between -180 and 180 degrees."),
+                },
+                lng.1.clone(),
+            )))?;
+        }
+        Ok(Operator(fid, GeoLowerThan([lat.0, lng.0], distance)))
+    }
+
+    fn between(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let (lresult, _) = pest_parse(items.next().unwrap());
+        let (rresult, _) = pest_parse(items.next().unwrap());
+
+        let lvalue = lresult.map_err(UserError::InvalidFilter)?;
+        let rvalue = rresult.map_err(UserError::InvalidFilter)?;
+
+        Ok(Operator(fid, Between(lvalue, rvalue)))
+    }
+
+    fn equal(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let value = items.next().unwrap();
+        let (result, svalue) = pest_parse(value);
+
+        let svalue = svalue.to_lowercase();
+        Ok(Operator(fid, Equal(result.ok(), svalue)))
+    }
+
+    fn greater_than(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let value = items.next().unwrap();
+        let (result, _svalue) = pest_parse(value);
+        let value = result.map_err(UserError::InvalidFilter)?;
+
+        Ok(Operator(fid, GreaterThan(value)))
+    }
+
+    fn greater_than_or_equal(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let value = items.next().unwrap();
+        let (result, _svalue) = pest_parse(value);
+        let value = result.map_err(UserError::InvalidFilter)?;
+
+        Ok(Operator(fid, GreaterThanOrEqual(value)))
+    }
+
+    fn lower_than(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let value = items.next().unwrap();
+        let (result, _svalue) = pest_parse(value);
+        let value = result.map_err(UserError::InvalidFilter)?;
+
+        Ok(Operator(fid, LowerThan(value)))
+    }
+
+    fn lower_than_or_equal(
+        fields_ids_map: &FieldsIdsMap,
+        filterable_fields: &HashSet<String>,
+        item: Pair<Rule>,
+    ) -> Result<FilterCondition> {
+        let mut items = item.into_inner();
+        let fid = match field_id(fields_ids_map, filterable_fields, &mut items)
+            .map_err(UserError::InvalidFilterAttribute)?
+        {
+            Some(fid) => fid,
+            None => return Ok(Empty),
+        };
+
+        let value = items.next().unwrap();
+        let (result, _svalue) = pest_parse(value);
+        let value = result.map_err(UserError::InvalidFilter)?;
+
+        Ok(Operator(fid, LowerThanOrEqual(value)))
+    }
 }
 
 impl FilterCondition {
@@ -227,9 +468,9 @@ impl FilterCondition {
         // as the facets values are all in the same database and prefixed by the
         // field id and the level.
         let (left, right) = match operator {
-            Operator::GreaterThan(val) => (Excluded(*val), Included(f64::MAX)),
-            Operator::GreaterThanOrEqual(val) => (Included(*val), Included(f64::MAX)),
-            Operator::Equal(number, string) => {
+            GreaterThan(val) => (Excluded(*val), Included(f64::MAX)),
+            GreaterThanOrEqual(val) => (Included(*val), Included(f64::MAX)),
+            Equal(number, string) => {
                 let (_original_value, string_docids) =
                     strings_db.get(rtxn, &(field_id, &string))?.unwrap_or_default();
                 let number_docids = match number {
@@ -251,23 +492,23 @@ impl FilterCondition {
                 };
                 return Ok(string_docids | number_docids);
             }
-            Operator::NotEqual(number, string) => {
+            NotEqual(number, string) => {
                 let all_numbers_ids = if number.is_some() {
                     index.number_faceted_documents_ids(rtxn, field_id)?
                 } else {
                     RoaringBitmap::new()
                 };
                 let all_strings_ids = index.string_faceted_documents_ids(rtxn, field_id)?;
-                let operator = Operator::Equal(*number, string.clone());
+                let operator = Equal(*number, string.clone());
                 let docids = Self::evaluate_operator(
                     rtxn, index, numbers_db, strings_db, field_id, &operator,
                 )?;
                 return Ok((all_numbers_ids | all_strings_ids) - docids);
             }
-            Operator::LowerThan(val) => (Included(f64::MIN), Excluded(*val)),
-            Operator::LowerThanOrEqual(val) => (Included(f64::MIN), Included(*val)),
-            Operator::Between(left, right) => (Included(*left), Included(*right)),
-            Operator::GeoLowerThan(base_point, distance) => {
+            LowerThan(val) => (Included(f64::MIN), Excluded(*val)),
+            LowerThanOrEqual(val) => (Included(f64::MIN), Included(*val)),
+            Between(left, right) => (Included(*left), Included(*right)),
+            GeoLowerThan(base_point, distance) => {
                 let rtree = match index.geo_rtree(rtxn)? {
                     Some(rtree) => rtree,
                     None => return Ok(RoaringBitmap::new()),
@@ -283,14 +524,14 @@ impl FilterCondition {
 
                 return Ok(result);
             }
-            Operator::GeoGreaterThan(point, distance) => {
+            GeoGreaterThan(point, distance) => {
                 let result = Self::evaluate_operator(
                     rtxn,
                     index,
                     numbers_db,
                     strings_db,
                     field_id,
-                    &Operator::GeoLowerThan(point.clone(), *distance),
+                    &GeoLowerThan(point.clone(), *distance),
                 )?;
                 let geo_faceted_doc_ids = index.geo_faceted_documents_ids(rtxn)?;
                 return Ok(geo_faceted_doc_ids - result);
@@ -344,3 +585,406 @@ impl FilterCondition {
         }
     }
 }
+
+/// Retrieve the field id base on the pest value.
+///
+/// Returns an error if the given value is not filterable.
+///
+/// Returns Ok(None) if the given value is filterable, but is not yet ascociated to a field_id.
+///
+/// The pest pair is simply a string associated with a span, a location to highlight in
+/// the error message.
+fn field_id(
+    fields_ids_map: &FieldsIdsMap,
+    filterable_fields: &HashSet<String>,
+    items: &mut Pairs<Rule>,
+) -> StdResult<Option<FieldId>, PestError<Rule>> {
+    // lexing ensures that we at least have a key
+    let key = items.next().unwrap();
+    if key.as_rule() == Rule::reserved {
+        let message = match key.as_str() {
+            key if key.starts_with("_geoPoint") => {
+                format!(
+                    "`_geoPoint` is a reserved keyword and thus can't be used as a filter expression. \
+                    Use the `_geoRadius(latitude, longitude, distance)` built-in rule to filter on `_geo` field coordinates.",
+                )
+            }
+            key @ "_geo" => {
+                format!(
+                    "`{}` is a reserved keyword and thus can't be used as a filter expression. \
+                    Use the `_geoRadius(latitude, longitude, distance)` built-in rule to filter on `_geo` field coordinates.",
+                    key
+                )
+            }
+            key => format!(
+                "`{}` is a reserved keyword and thus can't be used as a filter expression.",
+                key
+            ),
+        };
+        return Err(PestError::new_from_span(ErrorVariant::CustomError { message }, key.as_span()));
+    }
+
+    if !filterable_fields.contains(key.as_str()) {
+        return Err(PestError::new_from_span(
+            ErrorVariant::CustomError {
+                message: format!(
+                    "attribute `{}` is not filterable, available filterable attributes are: {}.",
+                    key.as_str(),
+                    filterable_fields.iter().join(", "),
+                ),
+            },
+            key.as_span(),
+        ));
+    }
+
+    Ok(fields_ids_map.id(key.as_str()))
+}
+
+/// Tries to parse the pest pair into the type `T` specified, always returns
+/// the original string that we tried to parse.
+///
+/// Returns the parsing error associated with the span if the conversion fails.
+fn pest_parse<T>(pair: Pair<Rule>) -> (StdResult<T, pest::error::Error<Rule>>, String)
+where
+    T: FromStr,
+    T::Err: ToString,
+{
+    let result = match pair.as_str().parse::<T>() {
+        Ok(value) => Ok(value),
+        Err(e) => Err(PestError::<Rule>::new_from_span(
+            ErrorVariant::CustomError { message: e.to_string() },
+            pair.as_span(),
+        )),
+    };
+
+    (result, pair.as_str().to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use big_s::S;
+    use heed::EnvOpenOptions;
+    use maplit::hashset;
+
+    use super::*;
+    use crate::update::Settings;
+
+    #[test]
+    fn string() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Set the filterable fields to be the channel.
+        let mut wtxn = index.write_txn().unwrap();
+        let mut map = index.fields_ids_map(&wtxn).unwrap();
+        map.insert("channel");
+        index.put_fields_ids_map(&mut wtxn, &map).unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_filterable_fields(hashset! { S("channel") });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Test that the facet condition is correctly generated.
+        let rtxn = index.read_txn().unwrap();
+        let condition = FilterCondition::from_str(&rtxn, &index, "channel = Ponce").unwrap();
+        let expected = Operator(0, Operator::Equal(None, S("ponce")));
+        assert_eq!(condition, expected);
+
+        let condition = FilterCondition::from_str(&rtxn, &index, "channel != ponce").unwrap();
+        let expected = Operator(0, Operator::NotEqual(None, S("ponce")));
+        assert_eq!(condition, expected);
+
+        let condition = FilterCondition::from_str(&rtxn, &index, "NOT channel = ponce").unwrap();
+        let expected = Operator(0, Operator::NotEqual(None, S("ponce")));
+        assert_eq!(condition, expected);
+    }
+
+    #[test]
+    fn number() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Set the filterable fields to be the channel.
+        let mut wtxn = index.write_txn().unwrap();
+        let mut map = index.fields_ids_map(&wtxn).unwrap();
+        map.insert("timestamp");
+        index.put_fields_ids_map(&mut wtxn, &map).unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_filterable_fields(hashset! { "timestamp".into() });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Test that the facet condition is correctly generated.
+        let rtxn = index.read_txn().unwrap();
+        let condition = FilterCondition::from_str(&rtxn, &index, "timestamp 22 TO 44").unwrap();
+        let expected = Operator(0, Between(22.0, 44.0));
+        assert_eq!(condition, expected);
+
+        let condition = FilterCondition::from_str(&rtxn, &index, "NOT timestamp 22 TO 44").unwrap();
+        let expected =
+            Or(Box::new(Operator(0, LowerThan(22.0))), Box::new(Operator(0, GreaterThan(44.0))));
+        assert_eq!(condition, expected);
+    }
+
+    #[test]
+    fn parentheses() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Set the filterable fields to be the channel.
+        let mut wtxn = index.write_txn().unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_searchable_fields(vec![S("channel"), S("timestamp")]); // to keep the fields order
+        builder.set_filterable_fields(hashset! { S("channel"), S("timestamp") });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Test that the facet condition is correctly generated.
+        let rtxn = index.read_txn().unwrap();
+        let condition = FilterCondition::from_str(
+            &rtxn,
+            &index,
+            "channel = gotaga OR (timestamp 22 TO 44 AND channel != ponce)",
+        )
+        .unwrap();
+        let expected = Or(
+            Box::new(Operator(0, Operator::Equal(None, S("gotaga")))),
+            Box::new(And(
+                Box::new(Operator(1, Between(22.0, 44.0))),
+                Box::new(Operator(0, Operator::NotEqual(None, S("ponce")))),
+            )),
+        );
+        assert_eq!(condition, expected);
+
+        let condition = FilterCondition::from_str(
+            &rtxn,
+            &index,
+            "channel = gotaga OR NOT (timestamp 22 TO 44 AND channel != ponce)",
+        )
+        .unwrap();
+        let expected = Or(
+            Box::new(Operator(0, Operator::Equal(None, S("gotaga")))),
+            Box::new(Or(
+                Box::new(Or(
+                    Box::new(Operator(1, LowerThan(22.0))),
+                    Box::new(Operator(1, GreaterThan(44.0))),
+                )),
+                Box::new(Operator(0, Operator::Equal(None, S("ponce")))),
+            )),
+        );
+        assert_eq!(condition, expected);
+    }
+
+    #[test]
+    fn reserved_field_names() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+        let rtxn = index.read_txn().unwrap();
+
+        let error = FilterCondition::from_str(&rtxn, &index, "_geo = 12").unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("`_geo` is a reserved keyword and thus can't be used as a filter expression. Use the `_geoRadius(latitude, longitude, distance)` built-in rule to filter on `_geo` field coordinates."),
+            "{}",
+            error.to_string()
+        );
+
+        let error =
+            FilterCondition::from_str(&rtxn, &index, r#"_geoDistance <= 1000"#).unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("`_geoDistance` is a reserved keyword and thus can't be used as a filter expression."),
+            "{}",
+            error.to_string()
+        );
+
+        let error = FilterCondition::from_str(&rtxn, &index, r#"_geoPoint > 5"#).unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("`_geoPoint` is a reserved keyword and thus can't be used as a filter expression. Use the `_geoRadius(latitude, longitude, distance)` built-in rule to filter on `_geo` field coordinates."),
+            "{}",
+            error.to_string()
+        );
+
+        let error =
+            FilterCondition::from_str(&rtxn, &index, r#"_geoPoint(12, 16) > 5"#).unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("`_geoPoint` is a reserved keyword and thus can't be used as a filter expression. Use the `_geoRadius(latitude, longitude, distance)` built-in rule to filter on `_geo` field coordinates."),
+            "{}",
+            error.to_string()
+        );
+    }
+
+    #[test]
+    fn geo_radius() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Set the filterable fields to be the channel.
+        let mut wtxn = index.write_txn().unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_searchable_fields(vec![S("_geo"), S("price")]); // to keep the fields order
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        let rtxn = index.read_txn().unwrap();
+        // _geo is not filterable
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(12, 12, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("attribute `_geo` is not filterable, available filterable attributes are:"),);
+
+        let mut wtxn = index.write_txn().unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_filterable_fields(hashset! { S("_geo"), S("price") });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        let rtxn = index.read_txn().unwrap();
+        // basic test
+        let condition =
+            FilterCondition::from_str(&rtxn, &index, "_geoRadius(12, 13.0005, 2000)").unwrap();
+        let expected = Operator(0, GeoLowerThan([12., 13.0005], 2000.));
+        assert_eq!(condition, expected);
+
+        // basic test with latitude and longitude at the max angle
+        let condition =
+            FilterCondition::from_str(&rtxn, &index, "_geoRadius(90, 180, 2000)").unwrap();
+        let expected = Operator(0, GeoLowerThan([90., 180.], 2000.));
+        assert_eq!(condition, expected);
+
+        // basic test with latitude and longitude at the min angle
+        let condition =
+            FilterCondition::from_str(&rtxn, &index, "_geoRadius(-90, -180, 2000)").unwrap();
+        let expected = Operator(0, GeoLowerThan([-90., -180.], 2000.));
+        assert_eq!(condition, expected);
+
+        // test the negation of the GeoLowerThan
+        let condition =
+            FilterCondition::from_str(&rtxn, &index, "NOT _geoRadius(50, 18, 2000.500)").unwrap();
+        let expected = Operator(0, GeoGreaterThan([50., 18.], 2000.500));
+        assert_eq!(condition, expected);
+
+        // composition of multiple operations
+        let condition = FilterCondition::from_str(
+            &rtxn,
+            &index,
+            "(NOT _geoRadius(1, 2, 300) AND _geoRadius(1.001, 2.002, 1000.300)) OR price <= 10",
+        )
+        .unwrap();
+        let expected = Or(
+            Box::new(And(
+                Box::new(Operator(0, GeoGreaterThan([1., 2.], 300.))),
+                Box::new(Operator(0, GeoLowerThan([1.001, 2.002], 1000.300))),
+            )),
+            Box::new(Operator(1, LowerThanOrEqual(10.))),
+        );
+        assert_eq!(condition, expected);
+
+        // georadius don't have any parameters
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
+
+        // georadius don't have any parameters
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius()");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
+
+        // georadius don't have enough parameters
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(1, 2)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
+
+        // georadius have too many parameters
+        let result =
+            FilterCondition::from_str(&rtxn, &index, "_geoRadius(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
+
+        // georadius have a bad latitude
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-100, 150, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("Latitude must be contained between -90 and 90 degrees."));
+
+        // georadius have a bad latitude
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-90.0000001, 150, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("Latitude must be contained between -90 and 90 degrees."));
+
+        // georadius have a bad longitude
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-10, 250, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("Longitude must be contained between -180 and 180 degrees."));
+
+        // georadius have a bad longitude
+        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-10, 180.000001, 10)");
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error
+            .to_string()
+            .contains("Longitude must be contained between -180 and 180 degrees."));
+    }
+
+    #[test]
+    fn from_array() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Set the filterable fields to be the channel.
+        let mut wtxn = index.write_txn().unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_searchable_fields(vec![S("channel"), S("timestamp")]); // to keep the fields order
+        builder.set_filterable_fields(hashset! { S("channel"), S("timestamp") });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Test that the facet condition is correctly generated.
+        let rtxn = index.read_txn().unwrap();
+        let condition = FilterCondition::from_array(
+            &rtxn,
+            &index,
+            vec![
+                Either::Right("channel = gotaga"),
+                Either::Left(vec!["timestamp = 44", "channel != ponce"]),
+            ],
+        )
+        .unwrap()
+        .unwrap();
+        let expected = FilterCondition::from_str(
+            &rtxn,
+            &index,
+            "channel = gotaga AND (timestamp = 44 OR channel != ponce)",
+        )
+        .unwrap();
+        assert_eq!(condition, expected);
+    }
+}

milli/src/search/facet/filter_parser.rs

@@ -1,622 +0,0 @@
-use std::collections::HashSet;
-use std::fmt::Debug;
-use std::result::Result as StdResult;
-
-use nom::branch::alt;
-use nom::bytes::complete::{tag, take_while1};
-use nom::character::complete::{char, multispace0};
-use nom::combinator::map;
-use nom::error::{ContextError, ErrorKind, VerboseError};
-use nom::multi::{many0, separated_list1};
-use nom::sequence::{delimited, preceded, tuple};
-use nom::IResult;
-
-use self::Operator::*;
-use super::FilterCondition;
-use crate::{FieldId, FieldsIdsMap};
-#[derive(Debug, Clone, PartialEq)]
-pub enum Operator {
-    GreaterThan(f64),
-    GreaterThanOrEqual(f64),
-    Equal(Option<f64>, String),
-    NotEqual(Option<f64>, String),
-    LowerThan(f64),
-    LowerThanOrEqual(f64),
-    Between(f64, f64),
-    GeoLowerThan([f64; 2], f64),
-    GeoGreaterThan([f64; 2], f64),
-}
-
-impl Operator {
-    /// This method can return two operations in case it must express
-    /// an OR operation for the between case (i.e. `TO`).
-    pub fn negate(self) -> (Self, Option<Self>) {
-        match self {
-            GreaterThan(n) => (LowerThanOrEqual(n), None),
-            GreaterThanOrEqual(n) => (LowerThan(n), None),
-            Equal(n, s) => (NotEqual(n, s), None),
-            NotEqual(n, s) => (Equal(n, s), None),
-            LowerThan(n) => (GreaterThanOrEqual(n), None),
-            LowerThanOrEqual(n) => (GreaterThan(n), None),
-            Between(n, m) => (LowerThan(n), Some(GreaterThan(m))),
-            GeoLowerThan(point, distance) => (GeoGreaterThan(point, distance), None),
-            GeoGreaterThan(point, distance) => (GeoLowerThan(point, distance), None),
-        }
-    }
-}
-
-pub trait FilterParserError<'a>:
-    nom::error::ParseError<&'a str> + ContextError<&'a str> + std::fmt::Debug
-{
-}
-
-impl<'a> FilterParserError<'a> for VerboseError<&'a str> {}
-
-pub struct ParseContext<'a> {
-    pub fields_ids_map: &'a FieldsIdsMap,
-    pub filterable_fields: &'a HashSet<String>,
-}
-
-impl<'a> ParseContext<'a> {
-    fn parse_or<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let (input, lhs) = self.parse_and(input)?;
-        let (input, ors) = many0(preceded(self.ws(tag("OR")), |c| Self::parse_or(self, c)))(input)?;
-
-        let expr = ors
-            .into_iter()
-            .fold(lhs, |acc, branch| FilterCondition::Or(Box::new(acc), Box::new(branch)));
-        Ok((input, expr))
-    }
-
-    fn parse_and<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let (input, lhs) = self.parse_not(input)?;
-        let (input, ors) =
-            many0(preceded(self.ws(tag("AND")), |c| Self::parse_and(self, c)))(input)?;
-        let expr = ors
-            .into_iter()
-            .fold(lhs, |acc, branch| FilterCondition::And(Box::new(acc), Box::new(branch)));
-        Ok((input, expr))
-    }
-
-    fn parse_not<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        alt((
-            map(
-                preceded(alt((self.ws(tag("!")), self.ws(tag("NOT")))), |c| {
-                    Self::parse_condition_expression(self, c)
-                }),
-                |e| e.negate(),
-            ),
-            |c| Self::parse_condition_expression(self, c),
-        ))(input)
-    }
-
-    fn ws<F, O, E>(&'a self, inner: F) -> impl FnMut(&'a str) -> IResult<&'a str, O, E>
-    where
-        F: Fn(&'a str) -> IResult<&'a str, O, E>,
-        E: FilterParserError<'a>,
-    {
-        delimited(multispace0, inner, multispace0)
-    }
-
-    fn parse_simple_condition<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let operator = alt((tag("<="), tag(">="), tag(">"), tag("="), tag("<"), tag("!=")));
-        let k = tuple((self.ws(|c| self.parse_key(c)), operator, self.ws(|c| self.parse_key(c))))(
-            input,
-        );
-        let (input, (key, op, value)) = match k {
-            Ok(o) => o,
-            Err(e) => {
-                return Err(e);
-            }
-        };
-
-        let fid = self.parse_fid(input, key)?;
-        let r: StdResult<f64, nom::Err<VerboseError<&str>>> = self.parse_numeric(value);
-        let k = match op {
-            "=" => FilterCondition::Operator(fid, Equal(r.ok(), value.to_string().to_lowercase())),
-            "!=" => {
-                FilterCondition::Operator(fid, NotEqual(r.ok(), value.to_string().to_lowercase()))
-            }
-            ">" | "<" | "<=" | ">=" => return self.parse_numeric_unary_condition(op, fid, value),
-            _ => unreachable!(),
-        };
-        Ok((input, k))
-    }
-
-    fn parse_numeric<E, T>(&'a self, input: &'a str) -> StdResult<T, nom::Err<E>>
-    where
-        E: FilterParserError<'a>,
-        T: std::str::FromStr,
-    {
-        match input.parse::<T>() {
-            Ok(n) => Ok(n),
-            Err(_) => {
-                return match input.chars().nth(0) {
-                    Some(ch) => Err(nom::Err::Failure(E::from_char(input, ch))),
-                    None => Err(nom::Err::Failure(E::from_error_kind(input, ErrorKind::Eof))),
-                };
-            }
-        }
-    }
-
-    fn parse_numeric_unary_condition<E>(
-        &'a self,
-        input: &'a str,
-        fid: u16,
-        value: &'a str,
-    ) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let numeric: f64 = self.parse_numeric(value)?;
-        let k = match input {
-            ">" => FilterCondition::Operator(fid, GreaterThan(numeric)),
-            "<" => FilterCondition::Operator(fid, LowerThan(numeric)),
-            "<=" => FilterCondition::Operator(fid, LowerThanOrEqual(numeric)),
-            ">=" => FilterCondition::Operator(fid, GreaterThanOrEqual(numeric)),
-            _ => unreachable!(),
-        };
-        Ok((input, k))
-    }
-
-    fn parse_fid<E>(&'a self, input: &'a str, key: &'a str) -> StdResult<FieldId, nom::Err<E>>
-    where
-        E: FilterParserError<'a>,
-    {
-        let error = match input.chars().nth(0) {
-            Some(ch) => Err(nom::Err::Failure(E::from_char(input, ch))),
-            None => Err(nom::Err::Failure(E::from_error_kind(input, ErrorKind::Eof))),
-        };
-        if !self.filterable_fields.contains(key) {
-            return error;
-        }
-        match self.fields_ids_map.id(key) {
-            Some(fid) => Ok(fid),
-            None => error,
-        }
-    }
-
-    fn parse_range_condition<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let (input, (key, from, _, to)) = tuple((
-            self.ws(|c| self.parse_key(c)),
-            self.ws(|c| self.parse_key(c)),
-            tag("TO"),
-            self.ws(|c| self.parse_key(c)),
-        ))(input)?;
-
-        let fid = self.parse_fid(input, key)?;
-        let numeric_from: f64 = self.parse_numeric(from)?;
-        let numeric_to: f64 = self.parse_numeric(to)?;
-        let res = FilterCondition::Operator(fid, Between(numeric_from, numeric_to));
-
-        Ok((input, res))
-    }
-
-    fn parse_geo_radius<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let err_msg_args_incomplete= "_geoRadius. The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`";
-        let err_msg_latitude_invalid =
-            "_geoRadius. Latitude must be contained between -90 and 90 degrees.";
-
-        let err_msg_longitude_invalid =
-            "_geoRadius. Longitude must be contained between -180 and 180 degrees.";
-
-        let (input, args): (&str, Vec<&str>) = match preceded(
-            tag("_geoRadius"),
-            delimited(
-                char('('),
-                separated_list1(tag(","), self.ws(|c| self.parse_value::<E>(c))),
-                char(')'),
-            ),
-        )(input)
-        {
-            Ok(e) => e,
-            Err(_e) => {
-                return Err(nom::Err::Failure(E::add_context(
-                    input,
-                    err_msg_args_incomplete,
-                    E::from_char(input, '('),
-                )));
-            }
-        };
-
-        if args.len() != 3 {
-            let e = E::from_char(input, '(');
-            return Err(nom::Err::Failure(E::add_context(input, err_msg_args_incomplete, e)));
-        }
-        let lat = self.parse_numeric(args[0])?;
-        let lng = self.parse_numeric(args[1])?;
-        let dis = self.parse_numeric(args[2])?;
-
-        let fid = match self.fields_ids_map.id("_geo") {
-            Some(fid) => fid,
-            None => return Ok((input, FilterCondition::Empty)),
-        };
-
-        if !(-90.0..=90.0).contains(&lat) {
-            return Err(nom::Err::Failure(E::add_context(
-                input,
-                err_msg_latitude_invalid,
-                E::from_char(input, '('),
-            )));
-        } else if !(-180.0..=180.0).contains(&lng) {
-            return Err(nom::Err::Failure(E::add_context(
-                input,
-                err_msg_longitude_invalid,
-                E::from_char(input, '('),
-            )));
-        }
-
-        let res = FilterCondition::Operator(fid, GeoLowerThan([lat, lng], dis));
-        Ok((input, res))
-    }
-
-    fn parse_condition<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let l1 = |c| self.parse_simple_condition(c);
-        let l2 = |c| self.parse_range_condition(c);
-        let l3 = |c| self.parse_geo_radius(c);
-        alt((l1, l2, l3))(input)
-    }
-
-    fn parse_condition_expression<E>(&'a self, input: &'a str) -> IResult<&str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        alt((
-            delimited(self.ws(char('(')), |c| Self::parse_expression(self, c), self.ws(char(')'))),
-            |c| Self::parse_condition(self, c),
-        ))(input)
-    }
-
-    fn parse_key<E>(&'a self, input: &'a str) -> IResult<&'a str, &'a str, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let key = |input| take_while1(Self::is_key_component)(input);
-        alt((key, delimited(char('"'), key, char('"'))))(input)
-    }
-
-    fn parse_value<E>(&'a self, input: &'a str) -> IResult<&'a str, &'a str, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        let key = |input| take_while1(Self::is_key_component)(input);
-        alt((key, delimited(char('"'), key, char('"'))))(input)
-    }
-
-    fn is_key_component(c: char) -> bool {
-        c.is_alphanumeric() || ['_', '-', '.'].contains(&c)
-    }
-
-    pub fn parse_expression<E>(&'a self, input: &'a str) -> IResult<&'a str, FilterCondition, E>
-    where
-        E: FilterParserError<'a>,
-    {
-        self.parse_or(input)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use big_s::S;
-    use either::Either;
-    use heed::EnvOpenOptions;
-    use maplit::hashset;
-
-    use super::*;
-    use crate::update::Settings;
-    use crate::Index;
-
-    #[test]
-    fn string() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut map = index.fields_ids_map(&wtxn).unwrap();
-        map.insert("channel");
-        index.put_fields_ids_map(&mut wtxn, &map).unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_filterable_fields(hashset! { S("channel") });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        // Test that the facet condition is correctly generated.
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_str(&rtxn, &index, "channel = Ponce").unwrap();
-        let expected = FilterCondition::Operator(0, Operator::Equal(None, S("ponce")));
-        assert_eq!(condition, expected);
-
-        let condition = FilterCondition::from_str(&rtxn, &index, "channel != ponce").unwrap();
-        let expected = FilterCondition::Operator(0, Operator::NotEqual(None, S("ponce")));
-        assert_eq!(condition, expected);
-
-        let condition = FilterCondition::from_str(&rtxn, &index, "NOT channel = ponce").unwrap();
-        let expected = FilterCondition::Operator(0, Operator::NotEqual(None, S("ponce")));
-        assert_eq!(condition, expected);
-    }
-
-    #[test]
-    fn number() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut map = index.fields_ids_map(&wtxn).unwrap();
-        map.insert("timestamp");
-        index.put_fields_ids_map(&mut wtxn, &map).unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_filterable_fields(hashset! { "timestamp".into() });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        // Test that the facet condition is correctly generated.
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_str(&rtxn, &index, "timestamp 22 TO 44").unwrap();
-        let expected = FilterCondition::Operator(0, Between(22.0, 44.0));
-        assert_eq!(condition, expected);
-
-        let condition = FilterCondition::from_str(&rtxn, &index, "NOT timestamp 22 TO 44").unwrap();
-        let expected = FilterCondition::Or(
-            Box::new(FilterCondition::Operator(0, LowerThan(22.0))),
-            Box::new(FilterCondition::Operator(0, GreaterThan(44.0))),
-        );
-        assert_eq!(condition, expected);
-    }
-
-    #[test]
-    fn compare() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        let mut wtxn = index.write_txn().unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_searchable_fields(vec![S("channel"), S("timestamp"), S("id")]); // to keep the fields order
-        builder.set_filterable_fields(hashset! { S("channel"), S("timestamp") ,S("id")});
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_str(&rtxn, &index, "channel < 20").unwrap();
-        let expected = FilterCondition::Operator(0, LowerThan(20.0));
-        assert_eq!(condition, expected);
-
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_str(&rtxn, &index, "id < 200").unwrap();
-        let expected = FilterCondition::Operator(2, LowerThan(200.0));
-        assert_eq!(condition, expected);
-    }
-
-    #[test]
-    fn parentheses() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_searchable_fields(vec![S("channel"), S("timestamp")]); // to keep the fields order
-        builder.set_filterable_fields(hashset! { S("channel"), S("timestamp") });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        // Test that the facet condition is correctly generated.
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_str(
-            &rtxn,
-            &index,
-            "channel = gotaga OR (timestamp 22 TO 44 AND channel != ponce)",
-        )
-        .unwrap();
-        let expected = FilterCondition::Or(
-            Box::new(FilterCondition::Operator(0, Operator::Equal(None, S("gotaga")))),
-            Box::new(FilterCondition::And(
-                Box::new(FilterCondition::Operator(1, Between(22.0, 44.0))),
-                Box::new(FilterCondition::Operator(0, Operator::NotEqual(None, S("ponce")))),
-            )),
-        );
-        assert_eq!(condition, expected);
-
-        let condition = FilterCondition::from_str(
-            &rtxn,
-            &index,
-            "channel = gotaga OR NOT (timestamp 22 TO 44 AND channel != ponce)",
-        )
-        .unwrap();
-        let expected = FilterCondition::Or(
-            Box::new(FilterCondition::Operator(0, Operator::Equal(None, S("gotaga")))),
-            Box::new(FilterCondition::Or(
-                Box::new(FilterCondition::Or(
-                    Box::new(FilterCondition::Operator(1, LowerThan(22.0))),
-                    Box::new(FilterCondition::Operator(1, GreaterThan(44.0))),
-                )),
-                Box::new(FilterCondition::Operator(0, Operator::Equal(None, S("ponce")))),
-            )),
-        );
-        assert_eq!(condition, expected);
-    }
-
-    #[test]
-    fn from_array() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_searchable_fields(vec![S("channel"), S("timestamp")]); // to keep the fields order
-        builder.set_filterable_fields(hashset! { S("channel"), S("timestamp") });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        // Test that the facet condition is correctly generated.
-        let rtxn = index.read_txn().unwrap();
-        let condition = FilterCondition::from_array(
-            &rtxn,
-            &index,
-            vec![
-                Either::Right("channel = gotaga"),
-                Either::Left(vec!["timestamp = 44", "channel != ponce"]),
-            ],
-        )
-        .unwrap()
-        .unwrap();
-        let expected = FilterCondition::from_str(
-            &rtxn,
-            &index,
-            "channel = gotaga AND (timestamp = 44 OR channel != ponce)",
-        )
-        .unwrap();
-        assert_eq!(condition, expected);
-    }
-    #[test]
-    fn geo_radius() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_searchable_fields(vec![S("_geo"), S("price")]); // to keep the fields order
-        builder.set_filterable_fields(hashset! { S("_geo"), S("price") });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        let rtxn = index.read_txn().unwrap();
-        // basic test
-        let condition =
-            FilterCondition::from_str(&rtxn, &index, "_geoRadius(12, 13.0005, 2000)").unwrap();
-        let expected = FilterCondition::Operator(0, GeoLowerThan([12., 13.0005], 2000.));
-        assert_eq!(condition, expected);
-
-        // test the negation of the GeoLowerThan
-        let condition =
-            FilterCondition::from_str(&rtxn, &index, "NOT _geoRadius(50, 18, 2000.500)").unwrap();
-        let expected = FilterCondition::Operator(0, GeoGreaterThan([50., 18.], 2000.500));
-        assert_eq!(condition, expected);
-
-        // composition of multiple operations
-        let condition = FilterCondition::from_str(
-            &rtxn,
-            &index,
-            "(NOT _geoRadius(1, 2, 300) AND _geoRadius(1.001, 2.002, 1000.300)) OR price <= 10",
-        )
-        .unwrap();
-        let expected = FilterCondition::Or(
-            Box::new(FilterCondition::And(
-                Box::new(FilterCondition::Operator(0, GeoGreaterThan([1., 2.], 300.))),
-                Box::new(FilterCondition::Operator(0, GeoLowerThan([1.001, 2.002], 1000.300))),
-            )),
-            Box::new(FilterCondition::Operator(1, LowerThanOrEqual(10.))),
-        );
-        assert_eq!(condition, expected);
-    }
-
-    #[test]
-    fn geo_radius_error() {
-        let path = tempfile::tempdir().unwrap();
-        let mut options = EnvOpenOptions::new();
-        options.map_size(10 * 1024 * 1024); // 10 MB
-        let index = Index::new(options, &path).unwrap();
-
-        // Set the filterable fields to be the channel.
-        let mut wtxn = index.write_txn().unwrap();
-        let mut builder = Settings::new(&mut wtxn, &index, 0);
-        builder.set_searchable_fields(vec![S("_geo"), S("price")]); // to keep the fields order
-        builder.set_filterable_fields(hashset! { S("_geo"), S("price") });
-        builder.execute(|_, _| ()).unwrap();
-        wtxn.commit().unwrap();
-
-        let rtxn = index.read_txn().unwrap();
-
-        // georadius don't have any parameters
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
-
-        // georadius don't have any parameters
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius()");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
-
-        // georadius don't have enough parameters
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(1, 2)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
-
-        // georadius have too many parameters
-        let result =
-            FilterCondition::from_str(&rtxn, &index, "_geoRadius(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error.to_string().contains("The `_geoRadius` filter expect three arguments: `_geoRadius(latitude, longitude, radius)`"));
-
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-100, 150, 10)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error
-            .to_string()
-            .contains("Latitude must be contained between -90 and 90 degrees."));
-
-        // georadius have a bad latitude
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-90.0000001, 150, 10)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error
-            .to_string()
-            .contains("Latitude must be contained between -90 and 90 degrees."));
-
-        // georadius have a bad longitude
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-10, 250, 10)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error
-            .to_string()
-            .contains("Longitude must be contained between -180 and 180 degrees."));
-
-        // georadius have a bad longitude
-        let result = FilterCondition::from_str(&rtxn, &index, "_geoRadius(-10, 180.000001, 10)");
-        assert!(result.is_err());
-        let error = result.unwrap_err();
-        assert!(error
-            .to_string()
-            .contains("Longitude must be contained between -180 and 180 degrees."));
-    }
-}

milli/src/search/facet/grammar.pest

@@ -0,0 +1,33 @@
+key = _{reserved | quoted | word }
+value = _{quoted | word }
+quoted = _{ (PUSH("'") | PUSH("\"")) ~ string ~ POP  }
+string = {char*}
+word = ${(LETTER | NUMBER | "_" | "-" | ".")+}
+
+char =  _{ !(PEEK | "\\") ~ ANY
+    | "\\" ~ (PEEK | "\\" | "/" | "b" | "f" | "n" | "r" | "t")
+    | "\\" ~ ("u" ~ ASCII_HEX_DIGIT{4})}
+
+reserved = { "_geoDistance" | ("_geoPoint" ~ parameters) | "_geo" }
+// we deliberately choose to allow empty parameters to generate more specific error message later
+parameters = {("(" ~ (value ~ ",")* ~ value? ~ ")") | ""}
+condition = _{between | eq | greater | less | geq | leq | neq}
+between = {key ~ value ~ "TO" ~ value}
+geq = {key ~ ">=" ~ value}
+leq = {key ~ "<=" ~ value}
+neq = {key ~ "!=" ~ value}
+eq = {key ~ "=" ~ value}
+greater = {key ~ ">" ~ value}
+less = {key ~ "<" ~ value}
+geo_radius = {"_geoRadius" ~ parameters }
+
+prgm = {SOI ~ expr ~ EOI}
+expr = _{ ( term ~ (operation ~ term)* ) }
+term = { ("(" ~ expr ~ ")") | condition | not | geo_radius }
+operation = _{ and | or }
+and = {"AND"}
+or = {"OR"}
+
+not = {"NOT" ~ term}
+
+WHITESPACE = _{ " " }

milli/src/search/facet/mod.rs

@@ -1,10 +1,11 @@
 pub use self::facet_distribution::FacetDistribution;
 pub use self::facet_number::{FacetNumberIter, FacetNumberRange, FacetNumberRevRange};
 pub use self::facet_string::FacetStringIter;
-pub use self::filter_condition::FilterCondition;
+pub use self::filter_condition::{FilterCondition, Operator};
+pub(crate) use self::parser::Rule as ParserRule;
 
 mod facet_distribution;
 mod facet_number;
 mod facet_string;
 mod filter_condition;
-mod filter_parser;
+mod parser;

milli/src/search/facet/parser.rs

@@ -0,0 +1,12 @@
+use once_cell::sync::Lazy;
+use pest::prec_climber::{Assoc, Operator, PrecClimber};
+
+pub static PREC_CLIMBER: Lazy<PrecClimber<Rule>> = Lazy::new(|| {
+    use Assoc::*;
+    use Rule::*;
+    pest::prec_climber::PrecClimber::new(vec![Operator::new(or, Left), Operator::new(and, Left)])
+});
+
+#[derive(Parser)]
+#[grammar = "search/facet/grammar.pest"]
+pub struct FilterParser;

milli/src/search/mod.rs

@@ -14,7 +14,8 @@ use meilisearch_tokenizer::{Analyzer, AnalyzerConfig};
 use once_cell::sync::Lazy;
 use roaring::bitmap::RoaringBitmap;
 
-pub use self::facet::{FacetDistribution, FacetNumberIter, FilterCondition};
+pub(crate) use self::facet::ParserRule;
+pub use self::facet::{FacetDistribution, FacetNumberIter, FilterCondition, Operator};
 pub use self::matching_words::MatchingWords;
 use self::query_tree::QueryTreeBuilder;
 use crate::error::UserError;