Put rule classes in their own files

src/rules/seq.cpp

@@ -0,0 +1,32 @@
+#include "seq.h"
+#include "blank.h"
+#include "transition_map.h"
+
+namespace tree_sitter  {
+    namespace rules {
+        Seq::Seq(const Rule &left, const Rule &right) : left(left.copy()), right(right.copy()) {};
+        Seq::Seq(rule_ptr left, rule_ptr right) : left(left), right(right) {};
+        
+        TransitionMap<Rule> Seq::transitions() const {
+            return left->transitions().map([&](rule_ptr left_rule) -> rule_ptr {
+                if (typeid(*left_rule) == typeid(Blank))
+                    return right;
+                else
+                    return rule_ptr(new Seq(left_rule, right));
+            });
+        }
+        
+        bool Seq::operator==(const Rule &rule) const {
+            const Seq *other = dynamic_cast<const Seq *>(&rule);
+            return (other != NULL) && (*other->left == *left) && (*other->right == *right);
+        }
+        
+        Seq * Seq::copy() const {
+            return new Seq(left, right);
+        }
+        
+        std::string Seq::to_string() const {
+            return std::string("(seq ") + left->to_string() + " " + right->to_string() + ")";
+        }
+    }
+}