1 files changed, 66 insertions, 0 deletions
diff --git a/src/file/format/json5.rs b/src/file/format/json5.rs
new file mode 100644
index 0000000..33a3135
--- /dev/null
+++ b/src/file/format/json5.rs
@@ -0,0 +1,66 @@
+use std::collections::HashMap;
+use std::error::Error;
+
+use crate::error::{ConfigError, Unexpected};
+use crate::value::{Value, ValueKind};
+
+#[derive(serde::Deserialize, Debug)]
+#[serde(untagged)]
+pub enum Val {
+    Null,
+    Boolean(bool),
+    Integer(i64),
+    Float(f64),
+    String(String),
+    Array(Vec<Val>),
+    Object(HashMap<String, Val>),
+}
+
+pub fn parse(
+    uri: Option<&String>,
+    text: &str,
+) -> Result<HashMap<String, Value>, Box<dyn Error + Send + Sync>> {
+    match json5_rs::from_str::<Val>(&text)? {
+        Val::String(ref value) => Err(Unexpected::Str(value.clone())),
+        Val::Integer(value) => Err(Unexpected::Integer(value)),
+        Val::Float(value) => Err(Unexpected::Float(value)),
+        Val::Boolean(value) => Err(Unexpected::Bool(value)),
+        Val::Array(_) => Err(Unexpected::Seq),
+        Val::Null => Err(Unexpected::Unit),
+        Val::Object(o) => match from_json5_value(uri, Val::Object(o)).kind {
+            ValueKind::Table(map) => Ok(map),
+            _ => Ok(HashMap::new()),
+        },
+    }
+    .map_err(|err| ConfigError::invalid_root(uri, err))
+    .map_err(|err| Box::new(err) as Box<dyn Error + Send + Sync>)
+}
+
+fn from_json5_value(uri: Option<&String>, value: Val) -> Value {
+    let vk = match value {
+        Val::Null => ValueKind::Nil,
+        Val::String(v) => ValueKind::String(v),
+        Val::Integer(v) => ValueKind::Integer(v),
+        Val::Float(v) => ValueKind::Float(v),
+        Val::Boolean(v) => ValueKind::Boolean(v),
+        Val::Object(table) => {
+            let m = table
+                .into_iter()
+                .map(|(k, v)| (k, from_json5_value(uri, v)))
+                .collect();
+
+            ValueKind::Table(m)
+        }
+
+        Val::Array(array) => {
+            let l = array
+                .into_iter()
+                .map(|v| from_json5_value(uri, v))
+                .collect();
+
+            ValueKind::Array(l)
+        }
+    };
+
+    Value::new(uri, vk)
+}