From 9826b2cda730116e148120dafe0fa89bd389626e Mon Sep 17 00:00:00 2001
From: Raphael Cohn <raphael.cohn@stormmq.com>
Date: Fri, 1 Sep 2017 09:06:27 +0100
Subject: Added HJSON (Human-Readable JSON) as a config file format

---
 src/file/format/hjson.rs | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/file/format/mod.rs   | 13 ++++++++++++
 src/lib.rs               |  5 ++++-
 3 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 src/file/format/hjson.rs

(limited to 'src')

diff --git a/src/file/format/hjson.rs b/src/file/format/hjson.rs
new file mode 100644
index 0000000..3d4ad1b
--- /dev/null
+++ b/src/file/format/hjson.rs
@@ -0,0 +1,55 @@
+use serde_hjson;
+use source::Source;
+use std::collections::HashMap;
+use std::error::Error;
+use value::{Value, ValueKind};
+
+pub fn parse(
+    uri: Option<&String>,
+    text: &str,
+) -> Result<HashMap<String, Value>, Box<Error + Send + Sync>> {
+    // Parse a JSON object value from the text
+    // TODO: Have a proper error fire if the root of a file is ever not a Table
+    let value = from_hjson_value(uri, &serde_hjson::from_str(text)?);
+    match value.kind {
+        ValueKind::Table(map) => Ok(map),
+
+        _ => Ok(HashMap::new()),
+    }
+}
+
+fn from_hjson_value(uri: Option<&String>, value: &serde_hjson::Value) -> Value {
+    match *value {
+        serde_hjson::Value::String(ref value) => Value::new(uri, ValueKind::String(value.clone())),
+
+        serde_hjson::Value::I64(value) => Value::new(uri, ValueKind::Integer(value)),
+
+        serde_hjson::Value::U64(value) => Value::new(uri, ValueKind::Integer(value as i64)),
+
+        serde_hjson::Value::F64(value) => Value::new(uri, ValueKind::Float(value)),
+        
+        serde_hjson::Value::Bool(value) => Value::new(uri, ValueKind::Boolean(value)),
+
+        serde_hjson::Value::Object(ref table) => {
+            let mut m = HashMap::new();
+
+            for (key, value) in table {
+                m.insert(key.to_lowercase().clone(), from_hjson_value(uri, value));
+            }
+
+            Value::new(uri, ValueKind::Table(m))
+        }
+
+        serde_hjson::Value::Array(ref array) => {
+            let mut l = Vec::new();
+
+            for value in array {
+                l.push(from_hjson_value(uri, value));
+            }
+
+            Value::new(uri, ValueKind::Array(l))
+        }
+
+        serde_hjson::Value::Null => Value::new(uri, ValueKind::Nil),
+    }
+}
diff --git a/src/file/format/mod.rs b/src/file/format/mod.rs
index a90dfda..5dfdfde 100644
--- a/src/file/format/mod.rs
+++ b/src/file/format/mod.rs
@@ -16,6 +16,9 @@ mod json;
 #[cfg(feature = "yaml")]
 mod yaml;
 
+#[cfg(feature = "hjson")]
+mod hjson;
+
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
 pub enum FileFormat {
     /// TOML (parsed with toml)
@@ -29,6 +32,10 @@ pub enum FileFormat {
     /// YAML (parsed with yaml_rust)
     #[cfg(feature = "yaml")]
     Yaml,
+
+    /// HJSON (parsed with serde_hjson)
+    #[cfg(feature = "hjson")]
+    Hjson,
 }
 
 lazy_static! {
@@ -46,6 +53,9 @@ lazy_static! {
         #[cfg(feature = "yaml")]
         formats.insert(FileFormat::Yaml, vec!["yaml", "yml"]);
 
+        #[cfg(feature = "hjson")]
+        formats.insert(FileFormat::Hjson, vec!["hjson"]);
+
         formats
     };
 }
@@ -77,6 +87,9 @@ impl FileFormat {
 
             #[cfg(feature = "yaml")]
             FileFormat::Yaml => yaml::parse(uri, text),
+
+            #[cfg(feature = "hjson")]
+            FileFormat::Hjson => hjson::parse(uri, text),
         }
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index bed60b4..b6eb0f6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,7 +5,7 @@
 //!  - Environment variables
 //!  - Another Config instance
 //!  - Remote configuration: etcd, Consul
-//!  - Files: JSON, YAML, TOML
+//!  - Files: JSON, YAML, TOML, HJSON
 //!  - Manual, programmatic override (via a `.set` method on the Config instance)
 //!
 //! Additionally, Config supports:
@@ -38,6 +38,9 @@ extern crate serde_json;
 #[cfg(feature = "yaml")]
 extern crate yaml_rust;
 
+#[cfg(feature = "hjson")]
+extern crate serde_hjson;
+
 mod error;
 mod value;
 mod de;
-- 
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