Add relation mappings and parsing

src/tokenizer/mod.rs

@@ -1,5 +1,5 @@
-use crate::tokens::mappings::{get_misc_mappings, get_operation_mappings};
-use crate::tokens::{Misc, Operation, Token};
+use crate::tokens::mappings::{get_misc_mappings, get_operation_mappings, get_relation_mapping};
+use crate::tokens::{Misc, Operation, Relation, Token};
 use charred::tapemachine::CharTapeMachine;
 use std::collections::HashMap;
 
@@ -45,4 +45,19 @@ impl Tokenizer {
         }
         None
     }
+
+    fn parse_relation(&mut self) -> Option<Relation> {
+        lazy_static! {
+            static ref RELATION_MAPPINGS: Vec<HashMap<&'static [&'static str], Relation>> =
+                get_relation_mapping();
+        }
+        for mapping in RELATION_MAPPINGS.iter() {
+            for key in mapping.keys() {
+                if self.ctm.check_any_str_sequence(*key) {
+                    return Some(mapping[key].clone());
+                }
+            }
+        }
+        None
+    }
 }

src/tokens/mappings.rs

@@ -1,6 +1,7 @@
 use crate::tokens::constants::misc::*;
 use crate::tokens::constants::operations::*;
-use crate::tokens::{Misc, Operation};
+use crate::tokens::constants::relations::*;
+use crate::tokens::{Misc, Operation, Relation};
 use std::cell::RefCell;
 use std::collections::HashMap;
 
@@ -88,3 +89,34 @@ pub fn get_misc_mappings() -> Vec<HashMap<&'static [&'static str], Misc>> {
         },
     ]
 }
+
+pub fn get_relation_mapping() -> Vec<HashMap<&'static [&'static str], Relation>> {
+    vec![
+        hashmap! {
+            G_SUBSETEQ => Relation::SubSetEq,
+            G_SUPSETEQ => Relation::SupSetEq,
+            G_LE => Relation::Le,
+            G_GE => Relation::Ge,
+            G_SUCCEQ => Relation::SuccEq,
+            G_PRECEQ => Relation::PrecEq,
+        },
+        hashmap! {
+            G_SUCC => Relation::Succ,
+        },
+        hashmap! {
+            G_EQ => Relation::Eq,
+            G_NE => Relation::Ne,
+            G_LT => Relation::Lt,
+            G_GT => Relation::Gt,
+            G_PREC => Relation::Prec,
+            G_IN => Relation::In,
+            G_NOTIN => Relation::NotIn,
+            G_SUBSET => Relation::SubSet,
+            G_SUPSET => Relation::SupSet,
+            G_EQUIV => Relation::Equiv,
+            G_CONG => Relation::Cong,
+            G_APPROX => Relation::Approx,
+            G_PROP => Relation::PropTo,
+        },
+    ]
+}