Drracket compat

.gitignore

@@ -1 +1,2 @@
 /target
+*.scm~

src/grammar.lalrpop

@@ -9,7 +9,10 @@ match {
     _
 }
 
-pub(crate) Trees = Tree+;
+
+pub(crate) File = {Lang? <Trees> }
+
+Trees = Tree+;
 
 pub(crate) Tree: Tree = {
     "(" <Tree+> ")" => Tree::Branch(<>),
@@ -38,3 +41,10 @@ Bool: bool = {
     "#t" => true,
     "#f" => false,
 }
+
+Lang: () = { "#lang" LangName }
+LangName = {
+    // TODO: What should these be?
+    "scheme",
+    "r7rs",
+} 

src/main.rs

@@ -7,7 +7,6 @@ mod grammar;
 #[cfg(test)]
 mod tests;
 
-
 // use debug2::dbg;
 use rustyline::validate::{
     MatchingBracketValidator, ValidationContext, ValidationResult, Validator,
@@ -156,7 +155,7 @@ fn main() {
 
 fn run_file(file: &str) -> io::Result<()> {
     let src = std::fs::read_to_string(file)?;
-    let tree = grammar::TreesParser::new().parse(&src).unwrap();
+    let tree = grammar::FileParser::new().parse(&src).unwrap();
     let mut env = default_env();
     for i in tree {
         eval(&i, &mut env).unwrap();
@@ -381,5 +380,3 @@ impl Validator for InputValidator {
         self.brackets.validate(ctx)
     }
 }
-
-

src/test/pass/lambda-calc.scm

@@ -1,3 +1,5 @@
+#lang scheme
+
 (define (displayln x) (display x) (newline))
 (define (printbool x) (displayln (bool->int x)))
 

src/test/pass/math.scm

@@ -1,4 +1,6 @@
-(define (displayln x) (display x) (newline))
+(define (displayln x)
+  (display x)
+  (newline))
 
 (displayln (+))
 (displayln (+ 1))