From 4e1cf2bdcafb45ba5fc8a295bc9103328ed071b1 Mon Sep 17 00:00:00 2001
From: Miko0187 <maiks0809@gmail.com>
Date: Thu, 3 Aug 2023 20:52:02 +0200
Subject: [PATCH] Added custom json deserializer

---
 Cargo.toml              |   2 -
 src/json/deserialize.rs | 135 ++++++++++++++++++++++++++++++++++++++++
 src/json/serialize.rs   |   7 +++
 src/main.rs             |   5 ++
 src/stores/container.rs |  26 ++++----
 src/stores/db.rs        |   2 +-
 6 files changed, 161 insertions(+), 16 deletions(-)
 create mode 100644 src/json/deserialize.rs
 create mode 100644 src/json/serialize.rs

diff --git a/Cargo.toml b/Cargo.toml
index 0331372..cfba332 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,4 @@ edition = "2021"
 
 [dependencies]
 hashbrown = "0.14"
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
 zstd = "0.12.4"
\ No newline at end of file
diff --git a/src/json/deserialize.rs b/src/json/deserialize.rs
new file mode 100644
index 0000000..123b918
--- /dev/null
+++ b/src/json/deserialize.rs
@@ -0,0 +1,135 @@
+use hashbrown::HashMap;
+
+use crate::values::key::Key;
+
+struct Deserializer {
+    data: String,
+    index: usize,
+}
+
+impl Deserializer {
+    pub(crate) fn new(data: String) -> Deserializer {
+        Deserializer { data, index: 0 }
+    }
+
+    fn next(&mut self) -> char {
+        let c = self
+            .data
+            .chars()
+            .nth(self.index)
+            .expect("Unable to get next character");
+        self.index += 1;
+        c
+    }
+
+    fn peek(&self, offset: usize) -> char {
+        self.data
+            .chars()
+            .nth(self.index + offset)
+            .expect("Unable to peek")
+    }
+
+    fn skip_whitespace(&mut self) {
+        while self.peek(0).is_whitespace() {
+            self.next();
+        }
+    }
+
+    fn parse_string(&mut self) -> String {
+        let mut string = String::new();
+        self.next();
+        while self.peek(0) != '"' {
+            string.push(self.next());
+        }
+        self.next();
+        string
+    }
+
+    fn parse_number(&mut self) -> f64 {
+        let mut number = String::new();
+        while self.peek(0).is_numeric() || self.peek(0) == '.' {
+            number.push(self.next());
+        }
+        number.parse::<f64>().expect("Unable to parse number")
+    }
+
+    fn parse_bool(&mut self) -> bool {
+        let mut boolean = String::new();
+        while self.peek(0).is_alphabetic() {
+            boolean.push(self.next());
+        }
+        match boolean.as_str() {
+            "true" => true,
+            "false" => false,
+            _ => panic!("Unable to parse boolean"),
+        }
+    }
+
+    fn parse_null(&mut self) -> () {
+        let mut null = String::new();
+        while self.peek(0).is_alphabetic() {
+            null.push(self.next());
+        }
+        match null.as_str() {
+            "null" => (),
+            _ => panic!("Unable to parse null"),
+        }
+    }
+
+    fn parse_array(&mut self) -> Vec<Key> {
+        let mut array = Vec::new();
+        self.next();
+        self.skip_whitespace();
+        while self.peek(0) != ']' {
+            let value = self.parse_value();
+            self.skip_whitespace();
+            array.push(value);
+            if self.peek(0) == ',' {
+                self.next();
+            }
+            self.skip_whitespace();
+        }
+        self.next();
+        array
+    }
+
+    fn parse_object(&mut self) -> HashMap<String, Key> {
+        let mut object = HashMap::new();
+        self.next();
+        self.skip_whitespace();
+        while self.peek(0) != '}' {
+            let key = self.parse_string();
+            self.skip_whitespace();
+            self.next();
+            self.skip_whitespace();
+            let value = self.parse_value();
+            self.skip_whitespace();
+            object.insert(key, value);
+            if self.peek(0) == ',' {
+                self.next();
+            }
+            self.skip_whitespace();
+        }
+        self.next();
+        object
+    }
+
+    fn parse_value(&mut self) -> Key {
+        self.skip_whitespace();
+        let value = match self.peek(0) {
+            '"' => Key::String(self.parse_string()),
+            '[' => Key::Array(self.parse_array()),
+            '{' => Key::Object(self.parse_object()),
+            '0'..='9' => Key::Number(self.parse_number()),
+            't' | 'f' => Key::Boolean(self.parse_bool()),
+            'n' => Key::Null(self.parse_null()),
+            _ => panic!("Invalid value"),
+        };
+        self.skip_whitespace();
+        value
+    }
+
+    pub(crate) fn deserialize(&mut self) -> HashMap<String, Key> {
+        self.parse_object()
+    }
+}
diff --git a/src/json/serialize.rs b/src/json/serialize.rs
new file mode 100644
index 0000000..f771f23
--- /dev/null
+++ b/src/json/serialize.rs
@@ -0,0 +1,7 @@
+use hashbrown::HashMap;
+
+use crate::values::key::Key;
+
+pub fn serialize(map: HashMap<String, Key>) -> String {
+    unimplemented!()
+}
diff --git a/src/main.rs b/src/main.rs
index 7ae7592..376c153 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,11 @@ use std::io::Read;
 
 mod encoding;
 
+mod json {
+    mod deserialize;
+    mod serialize;
+}
+
 mod stores {
     pub mod container;
     pub mod db;
diff --git a/src/stores/container.rs b/src/stores/container.rs
index cbf51fc..d4056ec 100644
--- a/src/stores/container.rs
+++ b/src/stores/container.rs
@@ -8,21 +8,21 @@ pub struct Container {
 }
 
 /*
-Container {
-    "TestContainer",
-    {
-        aaron: {
-            name: "Aaron",
-            age: 20,
+{
+    "name": "TestContainer",
+    "keys": {
+        "aaron": {
+            "name": "Aaron",
+            "age": 20
         },
-        bob: {
-            name: "Bob",
-            age: 21,
-        },
-        carl: {
-            name: "Carl",
-            age: 22,
+        "bob": {
+            "name": "Bob",
+            "age": 21
         },
+        "carl": {
+            "name": "Carl",
+            "age": 22
+        }
     }
 }
 */
diff --git a/src/stores/db.rs b/src/stores/db.rs
index a414ce5..af960d3 100644
--- a/src/stores/db.rs
+++ b/src/stores/db.rs
@@ -40,7 +40,7 @@ fn load_containers(file: String) -> Vec<HashMap<String, Container>> {
     let mut containers = Vec::new();
 
     for parse in parsed {
-        containers.push(serde_json::from_str(&parse).unwrap());
+        containers.push();
     }
 
     containers