handle null

examples/parse.rs

@@ -13,6 +13,7 @@ fn main() {
         "array" => [1,2,3,4],
         "bool" => false,
         "negative" => -1,
+        "null" => null,
     )
     "###;
 

src/lexer.rs

@@ -6,6 +6,8 @@ pub enum Token {
     Array,
     #[regex("true|false")]
     Bool,
+    #[regex("null")]
+    Null,
     #[token("=>")]
     Arrow,
     #[token("(")]
@@ -43,6 +45,7 @@ fn test_lex() {
         "array" => [1,2,3,4],
         "bool" => false,
         "negative" => -1,
+        "null" => null,
     )
     "###;
     let mut lex = Token::lexer(source);
@@ -105,6 +108,11 @@ fn test_lex() {
     assert_eq!(lex.next(), Some(Token::Integer));
     assert_eq!(lex.next(), Some(Token::Comma));
 
+    assert_eq!(lex.next(), Some(Token::LiteralString));
+    assert_eq!(lex.next(), Some(Token::Arrow));
+    assert_eq!(lex.next(), Some(Token::Null));
+    assert_eq!(lex.next(), Some(Token::Comma));
+
     assert_eq!(lex.next(), Some(Token::BracketClose));
 
     assert_eq!(lex.next(), None);

src/lib.rs

@@ -18,13 +18,13 @@
 //! # }
 //! ```
 //!
-mod ast;
 mod error;
 mod lexer;
+mod parser;
 mod string;
 
-pub use ast::parse;
 pub use error::{ParseError, SpannedError};
+pub use parser::parse;
 use std::borrow::Borrow;
 use std::collections::HashMap;
 use std::hash::{Hash, Hasher};
@@ -37,6 +37,7 @@ pub enum Value {
     Float(f64),
     String(String),
     Array(HashMap<Key, Value>),
+    Null,
 }
 
 /// A php value, can be either a bool, int, float, string or array
@@ -46,7 +47,8 @@ pub enum Value {
 ///
 /// ## Indexing
 ///
-/// If the value is a php array, you can directly index into the `Value`, this will panic if the `Value` is not an array
+/// If the value is a php array, you can directly index into the `Value`, this will null if the `Value` is not an array
+/// or the key is not found
 ///
 /// ```rust
 /// # use maplit::hashmap;
@@ -59,6 +61,7 @@ pub enum Value {
 /// });
 /// assert_eq!(value["key"], "value");
 /// assert_eq!(value[10], false);
+/// assert!(value["not"]["found"].is_null());
 /// # }
 /// ```
 impl Value {
@@ -87,6 +90,11 @@ impl Value {
         matches!(self, Value::Array(_))
     }
 
+    /// Check if the value is null
+    pub fn is_null(&self) -> bool {
+        matches!(self, Value::Null)
+    }
+
     /// Convert the value into a bool if it is one
     pub fn into_bool(self) -> Option<bool> {
         match self {
@@ -282,8 +290,8 @@ where
 
     fn index(&self, index: &Q) -> &Self::Output {
         match self {
-            Value::Array(map) => map.index(index),
-            _ => panic!("index into non array value"),
+            Value::Array(map) => map.get(index).unwrap_or(&Value::Null),
+            _ => &Value::Null,
         }
     }
 }
@@ -293,8 +301,8 @@ impl Index<Key> for Value {
 
     fn index(&self, index: Key) -> &Self::Output {
         match self {
-            Value::Array(map) => map.index(&index),
-            _ => panic!("index into non array value"),
+            Value::Array(map) => map.get(&index).unwrap_or(&Value::Null),
+            _ => &Value::Null,
         }
     }
 }
@@ -305,7 +313,7 @@ impl Index<i64> for Value {
     fn index(&self, index: i64) -> &Self::Output {
         match self {
             Value::Array(map) => map.index(&Key::Int(index)),
-            _ => panic!("index into non array value"),
+            _ => &Value::Null,
         }
     }
 }

src/parser.rs

@@ -40,17 +40,19 @@ pub fn parse_lexer<'source>(
             Token::Integer,
             Token::Float,
             Token::LiteralString,
+            Token::Null,
             Token::Array,
             Token::SquareOpen,
         ])
         .with_span(lexer.span(), source)?;
     let value = match token {
-        Token::Bool => parse_literal(token, lexer.slice()).with_span(lexer.span(), source)?,
-        Token::Integer => parse_literal(token, lexer.slice()).with_span(lexer.span(), source)?,
-        Token::Float => parse_literal(token, lexer.slice()).with_span(lexer.span(), source)?,
+        Token::Bool => Value::Bool(lexer.slice().parse().with_span(lexer.span(), source)?),
+        Token::Integer => Value::Int(lexer.slice().parse().with_span(lexer.span(), source)?),
+        Token::Float => Value::Float(lexer.slice().parse().with_span(lexer.span(), source)?),
         Token::LiteralString => {
-            parse_literal(token, lexer.slice()).with_span(lexer.span(), source)?
+            Value::String(parse_string(lexer.slice()).with_span(lexer.span(), source)?)
         }
+        Token::Null => Value::Null,
         Token::Array => Value::Array(parse_array(source, lexer, ArraySyntax::Long)?),
         Token::SquareOpen => Value::Array(parse_array(source, lexer, ArraySyntax::Short)?),
         _ => unreachable!(),
@@ -59,22 +61,6 @@ pub fn parse_lexer<'source>(
     Ok(value)
 }
 
-fn parse_literal(token: Token, slice: &str) -> Result<Value, ParseError> {
-    let token = token.expect_token(&[
-        Token::Bool,
-        Token::Integer,
-        Token::Float,
-        Token::LiteralString,
-    ])?;
-    match token {
-        Token::Bool => Ok(Value::Bool(slice.parse()?)),
-        Token::Integer => Ok(Value::Int(slice.parse()?)),
-        Token::Float => Ok(Value::Float(slice.parse()?)),
-        Token::LiteralString => Ok(Value::String(parse_string(slice)?)),
-        _ => unreachable!(),
-    }
-}
-
 fn parse_string(literal: &str) -> Result<String, UnescapeError> {
     let single_quote = literal.bytes().next().unwrap() == b'\'';
     let inner = &literal[1..(literal.len()) - 1];
@@ -273,9 +259,9 @@ fn test_parse() {
         Value::Array(hashmap! {
             Key::String("foo".into()) => Value::Bool(true),
             Key::String("nested".into()) => Value::Array(hashmap! {
-                Key::String("foo".into()) => Value::Bool(false),
+                Key::String("foo".into()) => Value::Null,
             }),
         }),
-        parse(r#"["foo" => true, "nested" => ['foo' => false]]"#).unwrap()
+        parse(r#"["foo" => true, "nested" => ['foo' => null]]"#).unwrap()
     );
 }