92 lines
2.2 KiB
Rust
92 lines
2.2 KiB
Rust
use crate::ctx::Context;
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use crate::dbs::{Options, Transaction};
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use crate::doc::CursorDoc;
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use crate::err::Error;
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use crate::sql::comment::mightbespace;
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use crate::sql::error::IResult;
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use crate::sql::idiom::Idiom;
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use crate::sql::kind::{kind, Kind};
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use crate::sql::value::{single, Value};
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use async_recursion::async_recursion;
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use nom::character::complete::char;
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use nom::combinator::cut;
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use nom::sequence::delimited;
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use revision::revisioned;
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use serde::{Deserialize, Serialize};
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use std::cmp::Ordering;
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use std::fmt;
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pub(crate) const TOKEN: &str = "$surrealdb::private::sql::Cast";
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#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
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#[serde(rename = "$surrealdb::private::sql::Cast")]
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#[revisioned(revision = 1)]
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pub struct Cast(pub Kind, pub Value);
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impl PartialOrd for Cast {
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#[inline]
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fn partial_cmp(&self, _: &Self) -> Option<Ordering> {
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None
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}
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}
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impl Cast {
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/// Convert cast to a field name
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pub fn to_idiom(&self) -> Idiom {
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self.1.to_idiom()
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}
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}
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impl Cast {
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#[cfg_attr(not(target_arch = "wasm32"), async_recursion)]
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#[cfg_attr(target_arch = "wasm32", async_recursion(?Send))]
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pub(crate) async fn compute(
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&self,
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ctx: &Context<'_>,
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opt: &Options,
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txn: &Transaction,
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doc: Option<&'async_recursion CursorDoc<'_>>,
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) -> Result<Value, Error> {
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// Prevent long cast chains
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let opt = &opt.dive(1)?;
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// Compute the value to be cast and convert it
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self.1.compute(ctx, opt, txn, doc).await?.convert_to(&self.0)
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}
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}
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impl fmt::Display for Cast {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "<{}> {}", self.0, self.1)
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}
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}
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pub fn cast(i: &str) -> IResult<&str, Cast> {
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let (i, k) = delimited(char('<'), cut(kind), char('>'))(i)?;
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let (i, _) = mightbespace(i)?;
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let (i, v) = cut(single)(i)?;
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Ok((i, Cast(k, v)))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn cast_int() {
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let sql = "<int>1.2345";
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let res = cast(sql);
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let out = res.unwrap().1;
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assert_eq!("<int> 1.2345f", format!("{}", out));
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assert_eq!(out, Cast(Kind::Int, 1.2345.into()));
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}
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#[test]
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fn cast_string() {
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let sql = "<string>1.2345";
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let res = cast(sql);
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let out = res.unwrap().1;
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assert_eq!("<string> 1.2345f", format!("{}", out));
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assert_eq!(out, Cast(Kind::String, 1.2345.into()));
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}
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}
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