update name to lowercase

src/gen.rs

@@ -1,5 +1,3 @@
-use std::collections::HashSet;
-
 use crate::ast::*;
 
 pub trait Gen {
@@ -9,7 +7,7 @@ pub trait Gen {
 impl Gen for Term {
     fn gen(&self) -> String {
         match self {
-            Term::Symbol(x) => x.clone(),
+            Term::Symbol(x) => x.to_lowercase(),
 			Term::Group(expr) => format!("({})", expr.gen()),
             Term::Option(expr) => format!("({})?", expr.gen()),
             Term::Repetition(expr) => format!("({})*", expr.gen()),
@@ -44,12 +42,13 @@ impl Gen for Expr {
 
 impl Gen for Bind {
     fn gen(&self) -> String {
+		let name = self.0.to_lowercase();
         let expr = if let Some(expr) = &self.1 {
             expr.gen()
         } else {
             "UNDEFINED".to_string()
         };
-        format!("{} = {{ {} }}", self.0, expr)
+        format!("{} = {{ {} }}", name, expr)
     }
 }
 

src/grammar.pest

@@ -1,17 +1,10 @@
 unit = { (!EOI ~ production)* ~ EOI }
 
-production = {
-	production_name ~ "=" ~ expression ~ "."
-}
-
-expression = {
-	alternative ~ ("|" ~ alternative)*
-}
-
-alternative = {
-	//term ~ term*
-	term+
-}
+production = { production_name ~ "=" ~ expression ~ "." }
+
+expression = { alternative ~ ("|" ~ alternative)* }
+
+alternative = { term+ }
 
 term =
 	{ production_name

src/main.rs

@@ -10,7 +10,7 @@ use crate::parser::*;
 use crate::gen::*;
 
 fn main() {
-	let mut r = File::open("./test/1.bnf").unwrap();
+	let mut r = File::open("./test/bnf.bnf").unwrap();
 	let mut buf = String::new();
 	r.read_to_string(&mut buf).unwrap();
 	let res = parse(&buf);

test/bnf.bnf

@@ -0,0 +1,7 @@
+Production  = production_name "=" [ Expression ] "." .
+Expression  = Alternative { "|" Alternative } .
+Alternative = Term { Term } .
+Term        = production_name | token [ "…" token ] | Group | Option | Repetition .
+Group       = "(" Expression ")" .
+Option      = "[" Expression "]" .
+Repetition  = "{" Expression "}" .