create an asc_desc module

milli/src/asc_desc.rs

@@ -0,0 +1,228 @@
+//! This module provide the `AscDesc` type and define a all the errors related to this type
+
+use std::fmt;
+use std::str::FromStr;
+
+use serde::{Deserialize, Serialize};
+
+use crate::error::is_reserved_keyword;
+use crate::CriterionError;
+
+/// This error type is never supposed to be shown to the end user.
+/// You must always cast it to a sort error or a criterion error.
+#[derive(Debug)]
+pub enum AscDescError {
+    InvalidSyntax { name: String },
+    ReservedKeyword { name: String },
+}
+
+impl fmt::Display for AscDescError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Self::InvalidSyntax { name } => {
+                write!(f, "invalid asc/desc syntax for {}", name)
+            }
+            Self::ReservedKeyword { name } => {
+                write!(
+                    f,
+                    "{} is a reserved keyword and thus can't be used as a asc/desc rule",
+                    name
+                )
+            }
+        }
+    }
+}
+
+impl From<AscDescError> for CriterionError {
+    fn from(error: AscDescError) -> Self {
+        match error {
+            AscDescError::InvalidSyntax { name } => CriterionError::InvalidName { name },
+            AscDescError::ReservedKeyword { name } if name.starts_with("_geoPoint") => {
+                CriterionError::ReservedNameForSort { name: "_geoPoint".to_string() }
+            }
+            AscDescError::ReservedKeyword { name } if name.starts_with("_geoRadius") => {
+                CriterionError::ReservedNameForFilter { name: "_geoRadius".to_string() }
+            }
+            AscDescError::ReservedKeyword { name } => (CriterionError::ReservedName { name }),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
+pub enum Member {
+    Field(String),
+    Geo([f64; 2]),
+}
+
+impl FromStr for Member {
+    type Err = AscDescError;
+
+    fn from_str(text: &str) -> Result<Member, Self::Err> {
+        match text.strip_prefix("_geoPoint(").and_then(|text| text.strip_suffix(")")) {
+            Some(point) => {
+                let (lat, long) = point
+                    .split_once(',')
+                    .ok_or_else(|| AscDescError::ReservedKeyword { name: text.to_string() })
+                    .and_then(|(lat, long)| {
+                        lat.trim()
+                            .parse()
+                            .and_then(|lat| long.trim().parse().map(|long| (lat, long)))
+                            .map_err(|_| AscDescError::ReservedKeyword { name: text.to_string() })
+                    })?;
+                Ok(Member::Geo([lat, long]))
+            }
+            None => {
+                if is_reserved_keyword(text) || text.starts_with("_geoRadius(") {
+                    return Err(AscDescError::ReservedKeyword { name: text.to_string() })?;
+                }
+                Ok(Member::Field(text.to_string()))
+            }
+        }
+    }
+}
+
+impl fmt::Display for Member {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Member::Field(name) => f.write_str(name),
+            Member::Geo([lat, lng]) => write!(f, "_geoPoint({}, {})", lat, lng),
+        }
+    }
+}
+
+impl Member {
+    pub fn field(&self) -> Option<&str> {
+        match self {
+            Member::Field(field) => Some(field),
+            Member::Geo(_) => None,
+        }
+    }
+
+    pub fn geo_point(&self) -> Option<&[f64; 2]> {
+        match self {
+            Member::Geo(point) => Some(point),
+            Member::Field(_) => None,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
+pub enum AscDesc {
+    Asc(Member),
+    Desc(Member),
+}
+
+impl AscDesc {
+    pub fn member(&self) -> &Member {
+        match self {
+            AscDesc::Asc(member) => member,
+            AscDesc::Desc(member) => member,
+        }
+    }
+
+    pub fn field(&self) -> Option<&str> {
+        self.member().field()
+    }
+}
+
+impl FromStr for AscDesc {
+    type Err = AscDescError;
+
+    /// Since we don't know if this was deserialized for a criterion or a sort we just return a
+    /// string and let the caller create his own error
+    fn from_str(text: &str) -> Result<AscDesc, Self::Err> {
+        match text.rsplit_once(':') {
+            Some((left, "asc")) => Ok(AscDesc::Asc(left.parse()?)),
+            Some((left, "desc")) => Ok(AscDesc::Desc(left.parse()?)),
+            _ => Err(AscDescError::InvalidSyntax { name: text.to_string() }),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use big_s::S;
+    use AscDesc::*;
+    use AscDescError::*;
+    use Member::*;
+
+    use super::*;
+
+    #[test]
+    fn parse_asc_desc() {
+        let valid_req = [
+            ("truc:asc", Asc(Field(S("truc")))),
+            ("bidule:desc", Desc(Field(S("bidule")))),
+            ("a-b:desc", Desc(Field(S("a-b")))),
+            ("a:b:desc", Desc(Field(S("a:b")))),
+            ("a12:asc", Asc(Field(S("a12")))),
+            ("42:asc", Asc(Field(S("42")))),
+            ("_geoPoint(42, 59):asc", Asc(Geo([42., 59.]))),
+            ("_geoPoint(42.459, 59):desc", Desc(Geo([42.459, 59.]))),
+            ("_geoPoint(42, 59.895):desc", Desc(Geo([42., 59.895]))),
+            ("_geoPoint(42, 59.895):desc", Desc(Geo([42., 59.895]))),
+            ("_geoPoint(42.0002, 59.895):desc", Desc(Geo([42.0002, 59.895]))),
+            ("_geoPoint(42., 59.):desc", Desc(Geo([42., 59.]))),
+            ("truc(12, 13):desc", Desc(Field(S("truc(12, 13)")))),
+        ];
+
+        for (req, expected) in valid_req {
+            let res = req.parse::<AscDesc>();
+            assert!(
+                res.is_ok(),
+                "Failed to parse `{}`, was expecting `{:?}` but instead got `{:?}`",
+                req,
+                expected,
+                res
+            );
+            assert_eq!(res.unwrap(), expected);
+        }
+
+        let invalid_req = [
+            ("truc:machin", InvalidSyntax { name: S("truc:machin") }),
+            ("truc:deesc", InvalidSyntax { name: S("truc:deesc") }),
+            ("truc:asc:deesc", InvalidSyntax { name: S("truc:asc:deesc") }),
+            ("42desc", InvalidSyntax { name: S("42desc") }),
+            ("_geoPoint:asc", ReservedKeyword { name: S("_geoPoint") }),
+            ("_geoDistance:asc", ReservedKeyword { name: S("_geoDistance") }),
+            ("_geoPoint(42.12 , 59.598)", InvalidSyntax { name: S("_geoPoint(42.12 , 59.598)") }),
+            (
+                "_geoPoint(42.12 , 59.598):deesc",
+                InvalidSyntax { name: S("_geoPoint(42.12 , 59.598):deesc") },
+            ),
+            (
+                "_geoPoint(42.12 , 59.598):machin",
+                InvalidSyntax { name: S("_geoPoint(42.12 , 59.598):machin") },
+            ),
+            (
+                "_geoPoint(42.12 , 59.598):asc:aasc",
+                InvalidSyntax { name: S("_geoPoint(42.12 , 59.598):asc:aasc") },
+            ),
+            (
+                "_geoPoint(42,12 , 59,598):desc",
+                ReservedKeyword { name: S("_geoPoint(42,12 , 59,598)") },
+            ),
+            ("_geoPoint(35, 85, 75):asc", ReservedKeyword { name: S("_geoPoint(35, 85, 75)") }),
+            ("_geoPoint(18):asc", ReservedKeyword { name: S("_geoPoint(18)") }),
+        ];
+
+        for (req, expected_error) in invalid_req {
+            let res = req.parse::<AscDesc>();
+            assert!(
+                res.is_err(),
+                "Should no be able to parse `{}`, was expecting an error but instead got: `{:?}`",
+                req,
+                res,
+            );
+            let res = res.unwrap_err();
+            assert_eq!(
+                res.to_string(),
+                expected_error.to_string(),
+                "Bad error for input {}: got `{:?}` instead of `{:?}`",
+                req,
+                res,
+                expected_error
+            );
+        }
+    }
+}