add parser tests

src/bong/parser.rs

@@ -1,8 +1,9 @@
 #![allow(dead_code)]
 
 use super::lexer::Token;
-use std::collections::HashMap;
+use std::{collections::HashMap, hash::Hash};
 
+#[derive(PartialEq, Debug)]
 pub enum Node {
     Element {
         name: String,
@@ -77,7 +78,7 @@ impl Parser {
     fn parse_value(&mut self) -> Result<Node, ParserError> {
         match self.current() {
             Some(Token::LBrace(_)) => self.parse_object(),
-            Some(Token::LBracket(_)) => self.parse_object(),
+            Some(Token::LBracket(_)) => self.parse_array(),
             Some(Token::Int(value)) => {
                 let value = value.parse().map_err(|_| "malformed int".to_string())?;
                 self.step();
@@ -99,13 +100,13 @@ impl Parser {
             }
             Some(Token::True(_)) => {
                 self.step();
-                Ok(Node::Bool(false))
+                Ok(Node::Bool(true))
             }
             Some(Token::Null(_)) => {
                 self.step();
                 Ok(Node::Null)
             }
-            Some(_) => Err("unexpected token, expected value".to_owned()),
+            Some(t) => Err(format!("unexpected token {t:?}, expected value")),
             None => Err("expected value".to_owned()),
         }
     }
@@ -216,7 +217,6 @@ impl Parser {
                                     break Ok(Node::Array(values));
                                 }
                                 _ => {
-                                    self.step();
                                     self.parse_optional_whitespace()?;
                                     values.push(self.parse_value()?)
                                 }
@@ -313,3 +313,99 @@ impl Parser {
         self.tokens.get(self.index)
     }
 }
+
+#[test]
+fn test_int() {
+    let parsed = Parser::new(vec![Token::Int("123".to_string())]).parse_top_level();
+    assert_eq!(parsed, Ok(Node::Int(123)))
+}
+
+#[test]
+fn test_float() {
+    let parsed = Parser::new(vec![Token::Float("3.15".to_string())]).parse_top_level();
+    assert_eq!(parsed, Ok(Node::Float(3.15)))
+}
+
+#[test]
+fn test_string() {
+    let parsed = Parser::new(vec![Token::String("\"hello\n\"".to_string())]).parse_top_level();
+    assert_eq!(parsed, Ok(Node::String("hello\n".to_string())))
+}
+
+#[test]
+fn test_bool() {
+    let parsed = Parser::new(vec![Token::True("true".to_owned())]).parse_top_level();
+    assert_eq!(parsed, Ok(Node::Bool(true)))
+}
+
+#[test]
+fn test_null() {
+    let parsed = Parser::new(vec![Token::Null("null".to_owned())]).parse_top_level();
+    assert_eq!(parsed, Ok(Node::Null))
+}
+
+#[test]
+fn test_array0() {
+    let parsed = Parser::new(vec![
+        Token::LBracket("[".to_string()),
+        Token::RBracket("]".to_string()),
+    ])
+    .parse_top_level();
+    assert_eq!(parsed, Ok(Node::Array(vec![])))
+}
+
+#[test]
+fn test_array1() {
+    let parsed = Parser::new(vec![
+        Token::LBracket("[".to_string()),
+        Token::Int("123".to_string()),
+        Token::RBracket("]".to_string()),
+    ])
+    .parse_top_level();
+    assert_eq!(parsed, Ok(Node::Array(vec![Node::Int(123)])))
+}
+
+#[test]
+fn test_array2() {
+    let parsed = Parser::new(vec![
+        Token::LBracket("[".to_string()),
+        Token::Int("123".to_string()),
+        Token::Comma(",".to_string()),
+        Token::String("\"hello\n\"".to_string()),
+        Token::RBracket("]".to_string()),
+    ])
+    .parse_top_level();
+    assert_eq!(
+        parsed,
+        Ok(Node::Array(vec![
+            Node::Int(123),
+            Node::String("hello\n".to_string()),
+        ]))
+    )
+}
+
+#[test]
+fn test_object0() {
+    let parsed = Parser::new(vec![
+        Token::LBrace("{".to_string()),
+        Token::RBrace("}".to_string()),
+    ])
+    .parse_top_level();
+    assert_eq!(parsed, Ok(Node::Object(HashMap::new())))
+}
+
+#[test]
+fn test_object1() {
+    let parsed = Parser::new(vec![
+        Token::LBrace("{".to_string()),
+        Token::RBrace("}".to_string()),
+    ])
+    .parse_top_level();
+    assert_eq!(
+        parsed,
+        Ok(Node::Object({
+            let fields = HashMap::new();
+            fields
+        }))
+    )
+}