1 files changed, 78 insertions, 0 deletions
diff --git a/src/file/format/json5.rs b/src/file/format/json5.rs
new file mode 100644
index 0000000..320e574
--- /dev/null
+++ b/src/file/format/json5.rs
@@ -0,0 +1,78 @@
+use serde_derive::Deserialize;
+
+use std::collections::HashMap;
+use std::error::Error;
+
+use crate::error::{ConfigError, Unexpected};
+use crate::value::{Value, ValueKind};
+
+#[derive(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>> {
+    let root = json5_rs::from_str::<Val>(&text)?;
+    if let Some(err) = match root {
+        Val::String(ref value) => Some(Unexpected::Str(value.clone())),
+        Val::Integer(value) => Some(Unexpected::Integer(value)),
+        Val::Float(value) => Some(Unexpected::Float(value)),
+        Val::Boolean(value) => Some(Unexpected::Bool(value)),
+        Val::Object(_) => None,
+        Val::Array(_) => Some(Unexpected::Seq),
+        Val::Null => Some(Unexpected::Unit),
+    } {
+        return Err(ConfigError::invalid_root(uri, err));
+    }
+
+    let value = from_json5_value(uri, root);
+    match value.kind {
+        ValueKind::Table(map) => Ok(map),
+
+        _ => Ok(HashMap::new()),
+    }
+}
+
+fn from_json5_value(uri: Option<&String>, value: Val) -> Value {
+    match value {
+        Val::String(v) => Value::new(uri, ValueKind::String(v)),
+
+        Val::Integer(v) => Value::new(uri, ValueKind::Integer(v)),
+
+        Val::Float(v) => Value::new(uri, ValueKind::Float(v)),
+
+        Val::Boolean(v) => Value::new(uri, ValueKind::Boolean(v)),
+
+        Val::Object(table) => {
+            let mut m = HashMap::new();
+
+            for (key, value) in table {
+                m.insert(key, from_json5_value(uri, value));
+            }
+
+            Value::new(uri, ValueKind::Table(m))
+        }
+
+        Val::Array(array) => {
+            let mut l = Vec::new();
+
+            for value in array {
+                l.push(from_json5_value(uri, value));
+            }
+
+            Value::new(uri, ValueKind::Array(l))
+        }
+
+        Val::Null => Value::new(uri, ValueKind::Nil),
+    }
+}