Constant changes

src/parser/find_subs.rs

@@ -44,22 +44,22 @@ pub fn p_find_subs(
 					"zeta"    => {Some("ζ")},
 					"eta"     => {Some("η")},
 					"theta"   => {Some("θ")},
-					"iota"    => {Some("ι")},
+					//"iota"    => {Some("ι")},
-					"kappa"   => {Some("κ")},
+					//"kappa"   => {Some("κ")},
 					"lambda"  => {Some("λ")},
 					"mu"      => {Some("μ")},
-					"nu"      => {Some("ν")},
+					//"nu"      => {Some("ν")},
 					"xi"      => {Some("ξ")},
-					"omicron" => {Some("ο")},
+					//"omicron" => {Some("ο")},
 					"pi"      => {Some("π")},
 					"rho"     => {Some("ρ")},
 					"sigma"   => {Some("σ")},
 					"tau"     => {Some("τ")},
-					"upsilon" => {Some("υ")},
+					//"upsilon" => {Some("υ")},
 					"phi"     => {Some("φ")},
 					"chi"     => {Some("χ")},
 					"psi"     => {Some("ψ")},
-					"omega"   => {Some("ω")}
+					"omega"   => {Some("ω")},
 
 					_ => {None}
 				};

src/parser/groupify.rs

@@ -93,7 +93,11 @@ pub fn p_groupify(mut g: VecDeque<Token>) -> Result<Token, (LineLocation, Parser
 				// unicode versions of each word.
 				v_now.push_back(match &s[..] {
 					"mod" => { Token::PreOperator(l, Operator::ModuloLong) },
-					"π"|"pi" => { Token::Constant(l, 3.141592653, String::from("π")) },
+
+					// Mathematical constants
+					"π"|"pi" => { Token::Constant(l, 3.141592653, String::from("pi")) },
+					"e" => { Token::Constant(l, 2.71828, String::from("e")) },
+					"phi"|"φ" => { Token::Constant(l, 1.61803, String::from("phi")) },
 					_ => { return Err((l, ParserError::Undefined(s))); }
 				});
 				lookback(v_now)?;