autoparser framework done

src/schala_lang/autoparser.rs

@@ -5,11 +5,25 @@ use schala_lang::{tokenizing, parsing};
 use self::tokenizing::*;
 use self::parsing::*;
 
-fn auto_parse(input: Vec<Token>) -> (Result<AST, ParseError>, Vec<String>) {
-  let err = ParseError { msg: format!("Not yet implemented") };
-  (Err(err), vec![])
+struct AutoParser {
+  tokens: Vec<Token>,
 }
 
+impl AutoParser {
+  fn new(tokens: Vec<Token>) -> AutoParser {
+    AutoParser { tokens: tokens.into_iter().rev().collect() }
+  }
+  fn peek(&mut self) -> TokenType {
+    self.tokens.last().map(|ref t| { t.token_type.clone() }).unwrap_or(TokenType::EOF)
+  }
+  fn next(&mut self) -> TokenType {
+    self.tokens.pop().map(|t| { t.token_type }).unwrap_or(TokenType::EOF)
+  }
+  fn parse(&mut self) -> (Result<AST, ParseError>, Vec<String>) {
+    let err = ParseError { msg: format!("Not yet implemented") };
+    (Err(err), vec![])
+  }
+}
 
 pub struct Schala { }
 
@@ -43,7 +57,9 @@ impl ProgrammingLanguageInterface for Schala {
       }
     }
 
-    let ast = match auto_parse(tokens) {
+    let mut parser = AutoParser::new(tokens);
+    
+    let ast = match parser.parse() {
       (Ok(ast), trace) => {
         if options.debug_parse {
           output.add_artifact(TraceArtifact::new_parse_trace(trace));