From 92e9f17ade330591a71aeb51fdeb01d83a8ac80b Mon Sep 17 00:00:00 2001
From: Tobie Morgan Hitchcock <tobie@abcum.com>
Date: Mon, 17 May 2021 18:00:17 +0100
Subject: [PATCH] Add exactly equal operator (==)

---
 src/fnc/operate.rs    | 4 ++++
 src/sql/expression.rs | 1 +
 src/sql/operator.rs   | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/src/fnc/operate.rs b/src/fnc/operate.rs
index 4256af22..7cdc3c2d 100644
--- a/src/fnc/operate.rs
+++ b/src/fnc/operate.rs
@@ -42,6 +42,10 @@ pub fn div(a: &Literal, b: &Literal) -> Result<Literal, Error> {
 	Ok(Literal::from(a / b))
 }
 
+pub fn exact(a: &Literal, b: &Literal) -> Result<Literal, Error> {
+	Ok(Literal::from(a == b))
+}
+
 pub fn equal(a: &Literal, b: &Literal) -> Result<Literal, Error> {
 	match a {
 		Literal::None => Ok(Literal::from(b.is_none() == true)),
diff --git a/src/sql/expression.rs b/src/sql/expression.rs
index 881d34be..352791ed 100644
--- a/src/sql/expression.rs
+++ b/src/sql/expression.rs
@@ -77,6 +77,7 @@ impl dbs::Process for Expression {
 					Operator::Mul => fnc::operate::mul(&l, &r),
 					Operator::Div => fnc::operate::div(&l, &r),
 					Operator::Equal => fnc::operate::equal(&l, &r),
+					Operator::Exact => fnc::operate::exact(&l, &r),
 					Operator::NotEqual => fnc::operate::not_equal(&l, &r),
 					Operator::AllEqual => fnc::operate::all_equal(&l, &r),
 					Operator::AnyEqual => fnc::operate::any_equal(&l, &r),
diff --git a/src/sql/operator.rs b/src/sql/operator.rs
index 53dd40f3..3116ca6f 100644
--- a/src/sql/operator.rs
+++ b/src/sql/operator.rs
@@ -19,6 +19,7 @@ pub enum Operator {
 	Dec, // -=
 	//
 	Equal,    // =
+	Exact,    // ==
 	NotEqual, // !=
 	AllEqual, // *=
 	AnyEqual, // ?=
@@ -64,6 +65,7 @@ impl fmt::Display for Operator {
 			Operator::Inc => write!(f, "+="),
 			Operator::Dec => write!(f, "-="),
 			Operator::Equal => write!(f, "="),
+			Operator::Exact => write!(f, "=="),
 			Operator::NotEqual => write!(f, "!="),
 			Operator::AllEqual => write!(f, "*="),
 			Operator::AnyEqual => write!(f, "?="),
@@ -111,6 +113,7 @@ pub fn operator(i: &str) -> IResult<&str, Operator> {
 		)),
 		alt((
 			map(tag("="), |_| Operator::Equal),
+			map(tag("=="), |_| Operator::Exact),
 			map(tag("!="), |_| Operator::NotEqual),
 			map(tag("*="), |_| Operator::AllEqual),
 			map(tag("?="), |_| Operator::AnyEqual),