Add function to search for reserved operators.

include/reserved.h

@@ -0,0 +1,41 @@
+#ifndef LIBABACUS_RESERVED_H
+#define LIBABACUS_RESERVED_H
+
+#include "result.h"
+#include "parsetype.h"
+#include "tree.h"
+#include "value.h"
+#include "libabacus.h"
+
+/**
+ * Struct that represents a reserved operator that contains
+ * interpreter-internal behavior.
+ */
+struct libab_reserved_operator_s {
+    /**
+     * The reserved operator.
+     */
+    const char* op;
+    /**
+     * The precedence of this operator.
+     */
+    int precedence;
+    /**
+     * The associativity of this operator.
+     */
+    int associativity;
+};
+
+typedef struct libab_reserved_operator_s libab_reserved_operator;
+
+/**
+ * Attempts to find a reserved operator with the given name.
+ * This function operates under the assumption that there are
+ * few reserved operators in libabacus. As such, it does effectively
+ * a polynomial time search - strcmp for every element until the operator is found.
+ * @param name the name to search for.
+ * @return the reserved operator, if it is found.
+ */
+const libab_reserved_operator* libab_find_reserved_operator(const char* name);
+
+#endif