Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 258 insertions, 0 deletions

diff --git a/vendor/serde_json/src/value/index.rs b/vendor/serde_json/src/value/index.rs
new file mode 100644
index 0000000..891ca8e
--- /dev/null
+++ b/vendor/serde_json/src/value/index.rs
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+use super::Value;
+use crate::map::Map;
+use alloc::borrow::ToOwned;
+use alloc::string::String;
+use core::fmt::{self, Display};
+use core::ops;
+
+/// A type that can be used to index into a `serde_json::Value`.
+///
+/// The [`get`] and [`get_mut`] methods of `Value` accept any type that
+/// implements `Index`, as does the [square-bracket indexing operator]. This
+/// trait is implemented for strings which are used as the index into a JSON
+/// map, and for `usize` which is used as the index into a JSON array.
+///
+/// [`get`]: ../enum.Value.html#method.get
+/// [`get_mut`]: ../enum.Value.html#method.get_mut
+/// [square-bracket indexing operator]: ../enum.Value.html#impl-Index%3CI%3E
+///
+/// This trait is sealed and cannot be implemented for types outside of
+/// `serde_json`.
+///
+/// # Examples
+///
+/// ```
+/// # use serde_json::json;
+/// #
+/// let data = json!({ "inner": [1, 2, 3] });
+///
+/// // Data is a JSON map so it can be indexed with a string.
+/// let inner = &data["inner"];
+///
+/// // Inner is a JSON array so it can be indexed with an integer.
+/// let first = &inner[0];
+///
+/// assert_eq!(first, 1);
+/// ```
+pub trait Index: private::Sealed {
+    /// Return None if the key is not already in the array or object.
+    #[doc(hidden)]
+    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value>;
+
+    /// Return None if the key is not already in the array or object.
+    #[doc(hidden)]
+    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value>;
+
+    /// Panic if array index out of bounds. If key is not already in the object,
+    /// insert it with a value of null. Panic if Value is a type that cannot be
+    /// indexed into, except if Value is null then it can be treated as an empty
+    /// object.
+    #[doc(hidden)]
+    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value;
+}
+
+impl Index for usize {
+    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> {
+        match v {
+            Value::Array(vec) => vec.get(*self),
+            _ => None,
+        }
+    }
+    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> {
+        match v {
+            Value::Array(vec) => vec.get_mut(*self),
+            _ => None,
+        }
+    }
+    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
+        match v {
+            Value::Array(vec) => {
+                let len = vec.len();
+                vec.get_mut(*self).unwrap_or_else(|| {
+                    panic!(
+                        "cannot access index {} of JSON array of length {}",
+                        self, len
+                    )
+                })
+            }
+            _ => panic!("cannot access index {} of JSON {}", self, Type(v)),
+        }
+    }
+}
+
+impl Index for str {
+    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> {
+        match v {
+            Value::Object(map) => map.get(self),
+            _ => None,
+        }
+    }
+    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> {
+        match v {
+            Value::Object(map) => map.get_mut(self),
+            _ => None,
+        }
+    }
+    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
+        if let Value::Null = v {
+            *v = Value::Object(Map::new());
+        }
+        match v {
+            Value::Object(map) => map.entry(self.to_owned()).or_insert(Value::Null),
+            _ => panic!("cannot access key {:?} in JSON {}", self, Type(v)),
+        }
+    }
+}
+
+impl Index for String {
+    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> {
+        self[..].index_into(v)
+    }
+    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> {
+        self[..].index_into_mut(v)
+    }
+    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
+        self[..].index_or_insert(v)
+    }
+}
+
+impl<T> Index for &T
+where
+    T: ?Sized + Index,
+{
+    fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> {
+        (**self).index_into(v)
+    }
+    fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> {
+        (**self).index_into_mut(v)
+    }
+    fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value {
+        (**self).index_or_insert(v)
+    }
+}
+
+// Prevent users from implementing the Index trait.
+mod private {
+    pub trait Sealed {}
+    impl Sealed for usize {}
+    impl Sealed for str {}
+    impl Sealed for alloc::string::String {}
+    impl<'a, T> Sealed for &'a T where T: ?Sized + Sealed {}
+}
+
+/// Used in panic messages.
+struct Type<'a>(&'a Value);
+
+impl<'a> Display for Type<'a> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        match *self.0 {
+            Value::Null => formatter.write_str("null"),
+            Value::Bool(_) => formatter.write_str("boolean"),
+            Value::Number(_) => formatter.write_str("number"),
+            Value::String(_) => formatter.write_str("string"),
+            Value::Array(_) => formatter.write_str("array"),
+            Value::Object(_) => formatter.write_str("object"),
+        }
+    }
+}
+
+// The usual semantics of Index is to panic on invalid indexing.
+//
+// That said, the usual semantics are for things like Vec and BTreeMap which
+// have different use cases than Value. If you are working with a Vec, you know
+// that you are working with a Vec and you can get the len of the Vec and make
+// sure your indices are within bounds. The Value use cases are more
+// loosey-goosey. You got some JSON from an endpoint and you want to pull values
+// out of it. Outside of this Index impl, you already have the option of using
+// value.as_array() and working with the Vec directly, or matching on
+// Value::Array and getting the Vec directly. The Index impl means you can skip
+// that and index directly into the thing using a concise syntax. You don't have
+// to check the type, you don't have to check the len, it is all about what you
+// expect the Value to look like.
+//
+// Basically the use cases that would be well served by panicking here are
+// better served by using one of the other approaches: get and get_mut,
+// as_array, or match. The value of this impl is that it adds a way of working
+// with Value that is not well served by the existing approaches: concise and
+// careless and sometimes that is exactly what you want.
+impl<I> ops::Index<I> for Value
+where
+    I: Index,
+{
+    type Output = Value;
+
+    /// Index into a `serde_json::Value` using the syntax `value[0]` or
+    /// `value["k"]`.
+    ///
+    /// Returns `Value::Null` if the type of `self` does not match the type of
+    /// the index, for example if the index is a string and `self` is an array
+    /// or a number. Also returns `Value::Null` if the given key does not exist
+    /// in the map or the given index is not within the bounds of the array.
+    ///
+    /// For retrieving deeply nested values, you should have a look at the
+    /// `Value::pointer` method.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let data = json!({
+    ///     "x": {
+    ///         "y": ["z", "zz"]
+    ///     }
+    /// });
+    ///
+    /// assert_eq!(data["x"]["y"], json!(["z", "zz"]));
+    /// assert_eq!(data["x"]["y"][0], json!("z"));
+    ///
+    /// assert_eq!(data["a"], json!(null)); // returns null for undefined values
+    /// assert_eq!(data["a"]["b"], json!(null)); // does not panic
+    /// ```
+    fn index(&self, index: I) -> &Value {
+        static NULL: Value = Value::Null;
+        index.index_into(self).unwrap_or(&NULL)
+    }
+}
+
+impl<I> ops::IndexMut<I> for Value
+where
+    I: Index,
+{
+    /// Write into a `serde_json::Value` using the syntax `value[0] = ...` or
+    /// `value["k"] = ...`.
+    ///
+    /// If the index is a number, the value must be an array of length bigger
+    /// than the index. Indexing into a value that is not an array or an array
+    /// that is too small will panic.
+    ///
+    /// If the index is a string, the value must be an object or null which is
+    /// treated like an empty object. If the key is not already present in the
+    /// object, it will be inserted with a value of null. Indexing into a value
+    /// that is neither an object nor null will panic.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use serde_json::json;
+    /// #
+    /// let mut data = json!({ "x": 0 });
+    ///
+    /// // replace an existing key
+    /// data["x"] = json!(1);
+    ///
+    /// // insert a new key
+    /// data["y"] = json!([false, false, false]);
+    ///
+    /// // replace an array value
+    /// data["y"][0] = json!(true);
+    ///
+    /// // inserted a deeply nested key
+    /// data["a"]["b"]["c"]["d"] = json!(true);
+    ///
+    /// println!("{}", data);
+    /// ```
+    fn index_mut(&mut self, index: I) -> &mut Value {
+        index.index_or_insert(self)
+    }
+}