first pass AST complete!

src/main.rs

@@ -1,12 +1,16 @@
+mod transformers;
+
+use std::borrow::Borrow;
 
 use bnf::{Grammar, ParseTree};
-use bnf::ParseTreeNode::{Nonterminal, Terminal};
+use crate::transformers::base::Program;
 
-const IGNORE: [&'static str; 3] = [
-  "",
-  "",
-  "",
-];
+
+// const IGNORE: [&'static str; 3] = [
+//   "",
+//   "",
+//   "",
+// ];
 
 fn main() {
 
@@ -30,115 +34,15 @@ fn main() {
 
   println!("Computed {} {} for program", trees.len(), pluralize(trees.len(), "tree", "trees"));
 
-  let tree = trees.get(0).expect("lmao how");
+  let tree = trees[0].borrow();
 
   let program = Program::new(tree);
 
-  println!("{:?}", program);
+  println!("{:#?}", program);
 
   println!("---");
 }
 
-trait TermDigestor {
-  fn get_term_str(&self) -> &'static str;
-}
-
-impl TermDigestor for Program<'_> {
-  fn get_term_str(&self) -> &'static str {
-    return "<program>";
-  }
-}
-
-#[derive(Debug)]
-struct Program<'a> {
-  pub uses: Vec<UseDeclaration<'a>>
-}
-
-impl Program<'_> {
-  pub fn new(tree: &ParseTree) -> Self {
-    let program = Program {
-      uses: vec![]
-    };
-    program.digest(tree);
-    return program
-  }
-
-  fn digest(&self, tree: &ParseTree) {
-    
-    if tree.lhs.to_string() == "<program$1>" {
-      self.digest_1(tree);
-      return;
-    } else if tree.lhs.to_string() == "<unit>" {
-      self.digest_unit(tree);
-      return;
-    }
-
-    println!("Program::digest {}", tree.lhs.to_string());
-    // mut because that recursion could get nasty.
-
-    for term in tree.rhs_iter() {
-      match term {
-        Terminal(str) => {
-          println!("{:?}", str);
-        },
-        Nonterminal(tree) => {
-          if tree.lhs.to_string().starts_with("<_") {
-            continue;
-          }
-          if tree.lhs.to_string() == "<program$1>" {
-            self.digest(tree);
-          }
-        }
-      }
-    }
-  }
-
-  fn digest_1(&self, tree: &ParseTree) {
-    println!("Program::digest$1 {}", tree.lhs.to_string());
-
-    for term in tree.rhs_iter() {
-      match term {
-        Terminal(str) => {
-          println!("{:?}", str);
-        },
-        Nonterminal(tree) => {
-          if tree.lhs.to_string().starts_with("<_") {
-            continue;
-          }
-          self.digest(tree);
-        }
-      }
-    }
-  }
-
-  fn digest_unit(&self, tree: &ParseTree) {
-    println!("Program::digest_unit {}", tree.lhs.to_string());
-    for term in tree.rhs_iter() {
-      match term {
-        Terminal(str) => {
-          println!("{:?}", str);
-        },
-        Nonterminal(tree) => {
-          if tree.lhs.to_string().starts_with("<_") {
-            continue;
-          }
-          println!("{:?}", tree.lhs.to_string())
-        }
-      }
-    }
-  }
-}
-
-#[derive(Debug)]
-struct UseDeclaration<'a> {
-  namespace: Vec<&'a str>
-}
-
-fn create_namespace(tree: ParseTree) -> Vec<&str> {
-  println!("{}", tree.lhs);
-  return vec![""]
-}
-
 fn pluralize<'a>(n: usize, singular: &'a str, plural: &'a str) -> &'a str {
   if n == 1 {
     return singular;

src/person.vm

@@ -1 +1,2 @@
 use vlib::Console
+use vlib::Map

src/transformers/base.rs

@@ -0,0 +1,56 @@
+
+use bnf::ParseTree;
+use bnf::ParseTreeNode::{Nonterminal, Terminal};
+use super::use_clause::UseDeclaration;
+
+#[derive(Debug)]
+pub struct Program {
+  pub uses: Vec<UseDeclaration>
+}
+
+impl Default for Program {
+  fn default() -> Self {
+    return Self {
+      uses: vec![]
+    };
+  }
+}
+
+impl Program {
+  pub fn new(tree: &ParseTree) -> Self {
+    return Self::digest(tree);
+  }
+
+  fn digest(tree: &ParseTree) -> Program {
+    // println!("Program::digest {}", tree.lhs.to_string());
+
+    let term = tree.lhs.to_string();
+    if term.starts_with("<_") {
+      return Program::default();
+    }
+    if term == "<use_clause>" {
+      return Program {
+        uses: vec![UseDeclaration::new(tree)]
+      }
+    }
+
+    let mut program: Program = Program::default();
+
+    for term in tree.rhs_iter() {
+      match term {
+        Terminal(_str) => { },
+        Nonterminal(tree) => {
+          program = Self::merge(program, Self::digest(tree));
+        }
+      }
+    }
+
+    return program;
+  }
+
+  fn merge<'a>(a: Program, b: Program) -> Program {
+    return Program {
+      uses: [a.uses, b.uses].concat()
+    }
+  }
+}

src/transformers/mod.rs

@@ -0,0 +1,2 @@
+pub mod base;
+mod use_clause;

src/transformers/use_clause.rs

@@ -0,0 +1,89 @@
+use bnf::ParseTree;
+use bnf::ParseTreeNode::{Nonterminal, Terminal};
+
+#[derive(Debug, Clone)]
+pub struct UseDeclaration {
+  namespace: Vec<String>
+}
+
+impl Default for UseDeclaration {
+  fn default() -> Self {
+    return Self { namespace: vec![] };
+  }
+}
+
+impl UseDeclaration {
+  pub fn new(tree: &ParseTree) -> Self {
+    return UseDeclaration::digest(tree);
+  }
+
+  fn digest(tree: &ParseTree) -> UseDeclaration {
+    // println!("UseDeclaration::digeset {}", tree.lhs);
+
+    let term = tree.lhs.to_string();
+
+    let mut decl = UseDeclaration::default();
+    if term == "<identifier>" {
+      return UseDeclaration {
+        namespace: vec![identifier(tree)]
+      }
+    }
+
+    for term in tree.rhs_iter() {
+      match term {
+        Terminal(_str) => { },
+        Nonterminal(tree) => {
+          decl = Self::merge(decl, UseDeclaration::new(tree))
+        }
+      }
+    }
+
+    return decl;
+  }
+
+  fn merge(a: UseDeclaration, b: UseDeclaration) -> UseDeclaration {
+    return UseDeclaration {
+      namespace: [a.namespace, b.namespace].concat()
+    }
+  }
+}
+
+
+fn identifier (tree: &ParseTree) -> String {
+
+  let term = tree.lhs.to_string();
+  if term == "<LETTER>" {
+    return letter(tree);
+  }
+
+  assert!(term == "<identifier>");
+
+  let mut build: String = "".to_owned();
+
+  for term in tree.rhs_iter() {
+    match term {
+      Terminal(str) => {
+        build += str;
+      },
+      Nonterminal(tree) => {
+        build += identifier(tree).as_str();
+      }
+    }
+  }
+
+  return build;
+}
+
+fn letter(tree: &ParseTree) -> String {
+  let term = tree.lhs.to_string();
+  assert!(term == "<LETTER>");
+  for term in tree.rhs_iter() {
+    match term {
+      Terminal(str) => {
+        return String::from(str.to_owned());
+      },
+      Nonterminal(_tree) => {}
+    }
+  }
+  return String::from("");
+}