surrealdb_sql/statements/
ifelse.rs

1use crate::ctx::Context;
2use crate::dbs::{Options, Transaction};
3use crate::doc::CursorDoc;
4use crate::err::Error;
5use crate::fmt::{fmt_separated_by, is_pretty, pretty_indent, Fmt, Pretty};
6use crate::Value;
7use derive::Store;
8use revision::revisioned;
9use serde::{Deserialize, Serialize};
10use std::fmt::{self, Display, Write};
11
12#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Store, Hash)]
13#[revisioned(revision = 1)]
14pub struct IfelseStatement {
15	pub exprs: Vec<(Value, Value)>,
16	pub close: Option<Value>,
17}
18
19impl IfelseStatement {
20	/// Check if we require a writeable transaction
21	pub(crate) fn writeable(&self) -> bool {
22		for (cond, then) in self.exprs.iter() {
23			if cond.writeable() || then.writeable() {
24				return true;
25			}
26		}
27		self.close.as_ref().map_or(false, |v| v.writeable())
28	}
29	/// Check if we require a writeable transaction
30	pub(crate) fn bracketed(&self) -> bool {
31		self.exprs.iter().all(|(_, v)| matches!(v, Value::Block(_)))
32			&& (self.close.as_ref().is_none()
33				|| self.close.as_ref().is_some_and(|v| matches!(v, Value::Block(_))))
34	}
35	/// Process this type returning a computed simple Value
36	pub(crate) async fn compute(
37		&self,
38		ctx: &Context<'_>,
39		opt: &Options,
40		txn: &Transaction,
41		doc: Option<&CursorDoc<'_>>,
42	) -> Result<Value, Error> {
43		for (ref cond, ref then) in &self.exprs {
44			let v = cond.compute(ctx, opt, txn, doc).await?;
45			if v.is_truthy() {
46				return then.compute(ctx, opt, txn, doc).await;
47			}
48		}
49		match self.close {
50			Some(ref v) => v.compute(ctx, opt, txn, doc).await,
51			None => Ok(Value::None),
52		}
53	}
54}
55
56impl Display for IfelseStatement {
57	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
58		let mut f = Pretty::from(f);
59		match self.bracketed() {
60			true => {
61				write!(
62					f,
63					"{}",
64					&Fmt::new(
65						self.exprs.iter().map(|args| {
66							Fmt::new(args, |(cond, then), f| {
67								if is_pretty() {
68									write!(f, "IF {cond}")?;
69									let indent = pretty_indent();
70									write!(f, "{then}")?;
71									drop(indent);
72								} else {
73									write!(f, "IF {cond} {then}")?;
74								}
75								Ok(())
76							})
77						}),
78						if is_pretty() {
79							fmt_separated_by("ELSE")
80						} else {
81							fmt_separated_by(" ELSE ")
82						},
83					),
84				)?;
85				if let Some(ref v) = self.close {
86					if is_pretty() {
87						write!(f, "ELSE")?;
88						let indent = pretty_indent();
89						write!(f, "{v}")?;
90						drop(indent);
91					} else {
92						write!(f, " ELSE {v}")?;
93					}
94				}
95				Ok(())
96			}
97			false => {
98				write!(
99					f,
100					"{}",
101					&Fmt::new(
102						self.exprs.iter().map(|args| {
103							Fmt::new(args, |(cond, then), f| {
104								if is_pretty() {
105									write!(f, "IF {cond} THEN")?;
106									let indent = pretty_indent();
107									write!(f, "{then}")?;
108									drop(indent);
109								} else {
110									write!(f, "IF {cond} THEN {then}")?;
111								}
112								Ok(())
113							})
114						}),
115						if is_pretty() {
116							fmt_separated_by("ELSE")
117						} else {
118							fmt_separated_by(" ELSE ")
119						},
120					),
121				)?;
122				if let Some(ref v) = self.close {
123					if is_pretty() {
124						write!(f, "ELSE")?;
125						let indent = pretty_indent();
126						write!(f, "{v}")?;
127						drop(indent);
128					} else {
129						write!(f, " ELSE {v}")?;
130					}
131				}
132				if is_pretty() {
133					f.write_str("END")?;
134				} else {
135					f.write_str(" END")?;
136				}
137				Ok(())
138			}
139		}
140	}
141}
surrealdb_sql/statements/ifelse.rs

surrealdb_sql/statements/
ifelse.rs
