130 lines
3 KiB
Rust
130 lines
3 KiB
Rust
use crate::ctx::Context;
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use crate::dbs::Options;
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use crate::dbs::Transaction;
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use crate::err::Error;
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use crate::sql::error::IResult;
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use crate::sql::idiom;
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use crate::sql::idiom::Idiom;
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use crate::sql::part::Next;
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use crate::sql::part::Part;
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use crate::sql::value::Value;
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use nom::character::complete::char;
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use serde::{Deserialize, Serialize};
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use std::fmt;
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use std::ops::Deref;
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use std::str;
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#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Hash)]
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pub struct Param(pub Idiom);
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impl From<Idiom> for Param {
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fn from(p: Idiom) -> Self {
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Self(p)
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}
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}
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impl Deref for Param {
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type Target = Idiom;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl Param {
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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<&Value>,
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) -> Result<Value, Error> {
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// Find a base variable by name
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match self.first() {
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// The first part will be a field
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Some(Part::Field(v)) => match v.as_str() {
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"this" | "self" => match doc {
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// The base document exists
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Some(v) => {
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// Get the path parts
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let pth: &[Part] = self;
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// Process the parameter value
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let res = v.compute(ctx, opt, txn, doc).await?;
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// Return the desired field
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res.get(ctx, opt, txn, pth.next()).await
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}
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// The base document does not exist
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None => Ok(Value::None),
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},
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_ => match ctx.value(v) {
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// The base variable exists
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Some(v) => {
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// Get the path parts
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let pth: &[Part] = self;
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// Process the parameter value
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let res = v.compute(ctx, opt, txn, doc).await?;
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// Return the desired field
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res.get(ctx, opt, txn, pth.next()).await
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}
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// The base variable does not exist
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None => Ok(Value::None),
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},
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},
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_ => unreachable!(),
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}
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}
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}
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impl fmt::Display for Param {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "${}", &self.0)
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}
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}
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pub fn param(i: &str) -> IResult<&str, Param> {
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let (i, _) = char('$')(i)?;
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let (i, v) = idiom::param(i)?;
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Ok((i, Param::from(v)))
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}
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pub fn basic(i: &str) -> IResult<&str, Param> {
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let (i, _) = char('$')(i)?;
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let (i, v) = idiom::basic(i)?;
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Ok((i, Param::from(v)))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::sql::test::Parse;
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#[test]
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fn param_normal() {
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let sql = "$test";
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let res = param(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("$test", format!("{}", out));
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assert_eq!(out, Param::parse("$test"));
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}
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#[test]
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fn param_longer() {
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let sql = "$test_and_deliver";
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let res = param(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("$test_and_deliver", format!("{}", out));
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assert_eq!(out, Param::parse("$test_and_deliver"));
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}
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#[test]
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fn param_embedded() {
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let sql = "$test.temporary[0].embedded";
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let res = param(sql);
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assert!(res.is_ok());
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let out = res.unwrap().1;
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assert_eq!("$test.temporary[0].embedded", format!("{}", out));
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assert_eq!(out, Param::parse("$test.temporary[0].embedded"));
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}
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}
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