From eba531741920955aa842f70a504359ff6387e1eb Mon Sep 17 00:00:00 2001
From: Valerie <sleeplessval@gmail.com>
Date: Wed, 9 Oct 2024 15:22:47 -0400
Subject: [PATCH] added a rudimentary fraction representation helper

---
 src/context/helper.rs | 20 ++++++++++++++++++++
 src/context/mod.rs    |  1 +
 src/main.rs           |  1 -
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/context/helper.rs b/src/context/helper.rs
index 664fed8..8e7a9a5 100644
--- a/src/context/helper.rs
+++ b/src/context/helper.rs
@@ -1,3 +1,4 @@
+
 use evalexpr::{
 	Value,
 
@@ -38,6 +39,25 @@ pub fn fix(arg: &Value) -> EvalResult {
 	} else { Err(EvalexprError::wrong_function_argument_amount(1, 2)) }
 }
 
+pub fn fraction(arg: &Value) -> EvalResult {
+	if let Value::Float(arg) = arg {
+		let mut intermediate = arg.clone();
+		let mut pow = 0;
+		while intermediate.fract() != 0_f64 {
+			intermediate *= 10_f64;
+			pow += 1;
+		}
+		let value = intermediate as i64;
+		let tens: i64 = 10_i64.pow(pow);
+		let gcd = util::gcd(value, tens);
+
+		let numerator = value / gcd;
+		let denominator = tens / gcd;
+
+		Ok(Value::String(format!("{numerator}/{denominator}")))
+	} else { Err(EvalexprError::expected_float(arg.clone())) }
+}
+
 pub fn greatest_common_divisor(arg: &Value) -> EvalResult {
 	if let Value::Tuple(args) = arg {
 		let len = args.len();
diff --git a/src/context/mod.rs b/src/context/mod.rs
index 58ccdd1..e6beeb6 100644
--- a/src/context/mod.rs
+++ b/src/context/mod.rs
@@ -27,6 +27,7 @@ pub fn build(args: &mut Arguments) -> HashMapContext {
 
 				//	math functions
 				"cos"	=>	Function::new(|arg| helper::cosine(arg)),
+				"fract"	=>	Function::new(|arg| helper::fraction(arg)),
 				"fix"	=>	Function::new(|arg| helper::fix(arg)),
 				"gcd"	=>	Function::new(|arg| helper::greatest_common_divisor(arg)),
 				"lcm"	=>	Function::new(|arg| helper::least_common_multiple(arg)),
diff --git a/src/main.rs b/src/main.rs
index 6a68dd6..ce17174 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,6 @@ use std::{
 use evalexpr::{
 	eval_with_context_mut,
 
-	ContextWithMutableVariables,
 	EvalexprError,
 	HashMapContext,
 	Value