Fix iff arrow parsing

Cargo.toml

@@ -2,7 +2,7 @@
 name = "asciimath-rs"
 description = "AsciiMath parser"
 repository = "https://github.com/trivernis/asciimath-rs"
-version = "0.4.6"
+version = "0.4.7"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 readme = "README.md"

src/lib.rs

@@ -364,7 +364,7 @@ mod tests {
     //#[test]
     fn it_writes_mathml() {
         let str_expression =
-            "alpha sqrt 1 in NN implies 2^4 + sum_(k = 1)^3 - ((1),(2))[[2, 3 + 3],[4, 5]]  + alpha";
+            "alpha sqrt 1 in NN implies 2^4 + <=> sum_(k = 1)^3 - ((1),(2))[[2, 3 + 3],[4, 5]]  + alpha";
         let expression = parse(str_expression.to_string());
         fs::write(
             "test-files/test.html",

src/parsing/tokenizer.rs

@@ -36,14 +36,14 @@ impl Tokenizer {
                 tokens.push(Token::Grouping(grouping))
             } else if let Some(arrow) = self.parse_arrows() {
                 tokens.push(Token::Arrow(arrow))
+            } else if let Some(logical) = self.parse_logical() {
+                tokens.push(Token::Logical(logical))
             } else if let Some(relation) = self.parse_relation() {
                 tokens.push(Token::Relation(relation))
             } else if let Some(operation) = self.parse_operation() {
                 tokens.push(Token::Operation(operation))
             } else if let Some(misc) = self.parse_misc() {
                 tokens.push(Token::Misc(misc))
-            } else if let Some(logical) = self.parse_logical() {
-                tokens.push(Token::Logical(logical))
             } else if let Some(accent) = self.parse_accent() {
                 tokens.push(Token::Accent(accent))
             } else if let Some(greek) = self.parse_greek() {