Pre-processor puts dedents each on own line (for simplicity)

demo/buildup.dee

@@ -28,4 +28,4 @@ obj <- {
     field <- "hello"
     method <- x -> x * 2
 }
-## Object creation
+## Object creation

rust/src/main.rs

@@ -1,5 +1,14 @@
 mod parser;
 
+use std::io::prelude::*;
+use std::env;
+use std::fs::File;
+
 fn main() {
-    println!("Hello, world!");
+    let args: Vec<String> = env::args().collect();
+    let mut file = File::open(&args[1]).expect("Could not read file");
+    let mut prgm = String::new();
+    file.read_to_string(&mut prgm).unwrap();
+    let tree = parser::parse(&prgm);
+    println!("{:?}", tree);
 }

rust/src/parser.rs

@@ -90,6 +90,7 @@ fn preprocess(input: &str) -> String {
                 } else if curr > &count {
                     while stack.last().unwrap() > &count {
                         output.push_str("<<<");
+                        output.push('\n');
                         stack.pop();
                     }
                 }
@@ -99,9 +100,17 @@ fn preprocess(input: &str) -> String {
         output.push_str(line.trim());
         output.push('\n');
     }
+    println!("{}", output);
     output
 }
 
+pub fn parse<'a>(prgm: &'a str) -> Vec<Stmt<'a>> {
+    let prgm = preprocess(prgm);
+    let prgm = Box::new(prgm);
+    let prgm = Box::leak(prgm);
+    deelang_parser::program(prgm).unwrap()
+}
+
 
 #[cfg(test)]
 mod test {
@@ -109,7 +118,7 @@ mod test {
 
     #[test]
     fn test_comments() {
-        let prgm = "## This is a comment
+        let prgm = r"## This is a comment
 apple <- 1 ## This is too
 ## This comment ends the file";
         let expected = vec![Stmt::Assignment("apple", Expr::Num(1.0))];
@@ -251,9 +260,12 @@ foo <- x -> y -> x * y";
         let expected = r"
 >>>.
 >>>.
-<<<.
+<<<
+.
 >>>.
-<<<<<<.
+<<<
+<<<
+.
 ## Hello World
 ";
         assert_eq!(preprocess(prgm), expected);