WIP: Pure Rust impl. of run_query

src/machine/lib_machine.rs

@@ -1,10 +1,48 @@
 use std::collections::BTreeSet;
 
+use crate::machine::BREAK_FROM_DISPATCH_LOOP_LOC;
+use crate::machine::mock_wam::{CompositeOpDir, Term};
+use crate::parser::parser::{Parser, Tokens};
+
 use super::{
     Machine, MachineConfig, QueryResult, QueryResolutionLine, 
     Atom, AtomCell, HeapCellValue, HeapCellValueTag,
     streams::Stream
 };
+use ref_thread_local::__Deref;
+fn print_term(term: &Term) {
+    match term {
+        Term::Clause(clause, atom, terms) => {
+            println!("clause: {:?}", clause);
+            println!("atom: {:?}", atom.as_str());
+            println!("terms: {:?}", terms);
+
+            for term in terms {
+               print_term(term);
+            }
+        },
+        Term::Cons(cons, term1, term2) => {
+            println!("constant: {:?}", cons);
+            println!("term1: {:?}", term1);
+            println!("term2: {:?}", term2);
+        },
+        Term::Literal(cell, literal) => {
+            println!("Cell: {:?}", cell);
+            println!("Literal: {:?}", literal);
+        },
+        Term::Var(var_reg, var_ptr) => {
+            println!("Var: {:?}, {:?}", var_reg.get(), var_ptr.deref());
+        },
+        Term::CompleteString(cell, atom) => {
+            println!("Cell: {:?}", cell);
+            println!("Atom: {:?}", atom.as_str());
+        },
+        _ => {
+            println!("Parsed query: {:?}", term);
+        }
+    }
+    
+}
 
 impl Machine {
     pub fn new_lib() -> Self {
@@ -25,11 +63,59 @@ impl Machine {
     }
 
     pub fn run_query(&mut self, query: String) -> QueryResult {
-        let input = format!("{}", query);
+        //let input = format!("{}", query);
         //println!("Running query: {}", input);
-        self.set_user_input(input);
-        self.run_top_level(atom!("$toplevel"), (atom!("run_input_once"), 0));
-        self.parse_output()
+
+        // Create a new Stream from the user input
+        let stream = Stream::from_owned_string(query.clone(), &mut self.machine_st.arena);
+        // Read the term from the user input
+        let _result = self.machine_st.read_term_from_user_input(stream, &mut self.indices);
+
+
+        // Parse the query so we can analyze and then call the term
+        let mut parser = Parser::new(
+            Stream::from_owned_string(query, &mut self.machine_st.arena),
+            &mut self.machine_st
+        );
+        let op_dir = CompositeOpDir::new(&self.indices.op_dir, None);
+        let term = parser.read_term(&op_dir, Tokens::Default).expect("Failed to parse query");
+
+        // ... trying to understand what's going on here
+        print_term(&term);
+
+        // Extract the atom from the term which we need to find the code index
+        let term_atom = if let Term::Clause(_, atom, _) = term {
+            atom
+        } else {
+            panic!("Expected a clause");
+        };
+        println!("term_atom: {:?}", term_atom.as_str());
+        //println!("code_dir: {:?}", self.indices.code_dir);
+        let code_index = self.indices.code_dir.get(&(term_atom, term.arity()));
+        println!("code_index: {:?}", code_index);
+
+        // Ok, we have a code_index, so we can set the program counter to the code index:
+
+        self.machine_st.cp = BREAK_FROM_DISPATCH_LOOP_LOC;
+        self.machine_st.p = code_index.expect("couldn't get code index").local().unwrap();
+
+        println!("running dispatch loop");
+        self.dispatch_loop();
+        println!("done");
+
+        // If we don't set this register, we get an error in write_term.
+        // It seems to be the register that holds max_depth
+        self.machine_st.registers[7] = 50.into();
+
+        let op_dir = &self.indices.op_dir;
+        let printer = self.machine_st.write_term(op_dir)
+            .expect("Couldn't get printer from write_term")
+            .expect("Couldn't get printer from write_term");
+
+        println!("Varnames: {:?}", printer.var_names);
+        println!("Printer: {:?}", printer);
+
+        Err("not implementend".to_string())
     }
 
     pub fn parse_output(&self) -> QueryResult {