feat(tazjin/rlox): Wire up parser to the REPL r/1990

Change-Id: I940448c63ce105d53a0f281b6320ffb01378f207
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2235
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

2 files changed, 21 insertions, 7 deletions

diff --git a/users/tazjin/rlox/src/interpreter.rs b/users/tazjin/rlox/src/interpreter.rs
index 77f2492a46..8a4d5cfef0 100644
--- a/users/tazjin/rlox/src/interpreter.rs
+++ b/users/tazjin/rlox/src/interpreter.rs
@@ -1,4 +1,5 @@
 use crate::errors::{report, Error};
+use crate::parser;
 use crate::scanner::{self, Token};
 
 // Run some Lox code and print it to stdout
@@ -6,12 +7,19 @@ pub fn run(code: &str) {
     let chars: Vec<char> = code.chars().collect();
 
     match scanner::scan(&chars) {
-        Ok(tokens) => print_tokens(tokens),
+        Ok(tokens) => {
+            print_tokens(&tokens);
+            match parser::parse(tokens) {
+                Ok(expr) => println!("Expression:\n{:?}", expr),
+                Err(error) => report_errors(vec![error]),
+            }
+        }
         Err(errors) => report_errors(errors),
     }
 }
 
-fn print_tokens<'a>(tokens: Vec<Token<'a>>) {
+fn print_tokens<'a>(tokens: &Vec<Token<'a>>) {
+    println!("Tokens:");
     for token in tokens {
         println!("{:?}", token);
     }
diff --git a/users/tazjin/rlox/src/parser.rs b/users/tazjin/rlox/src/parser.rs
index e7266c2352..cf96981e5b 100644
--- a/users/tazjin/rlox/src/parser.rs
+++ b/users/tazjin/rlox/src/parser.rs
@@ -11,17 +11,17 @@ use crate::scanner::{Token, TokenKind};
 // AST
 
 #[derive(Debug)]
-struct Binary<'a> {
+pub struct Binary<'a> {
     left: Box<Expr<'a>>,
     operator: Token<'a>,
     right: Box<Expr<'a>>,
 }
 
 #[derive(Debug)]
-struct Grouping<'a>(Box<Expr<'a>>);
+pub struct Grouping<'a>(Box<Expr<'a>>);
 
 #[derive(Debug)]
-enum Literal {
+pub enum Literal {
     Boolean(bool),
     Number(f64),
     String(String),
@@ -29,13 +29,13 @@ enum Literal {
 }
 
 #[derive(Debug)]
-struct Unary<'a> {
+pub struct Unary<'a> {
     operator: Token<'a>,
     right: Box<Expr<'a>>,
 }
 
 #[derive(Debug)]
-enum Expr<'a> {
+pub enum Expr<'a> {
     Binary(Binary<'a>),
     Grouping(Grouping<'a>),
     Literal(Literal),
@@ -200,3 +200,9 @@ impl<'a> Parser<'a> {
         return Ok(expr);
     }
 }
+
+pub fn parse<'a>(tokens: Vec<Token<'a>>) -> ExprResult<'a> {
+    let mut parser = Parser { tokens, current: 0 };
+
+    parser.expression()
+}