diff options
Diffstat (limited to 'src/file/format/json.rs')
-rw-r--r-- | src/file/format/json.rs | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/file/format/json.rs b/src/file/format/json.rs new file mode 100644 index 0000000..a3d80a7 --- /dev/null +++ b/src/file/format/json.rs @@ -0,0 +1,77 @@ +use serde_json; +use source::Source; +use std::collections::HashMap; +use std::error::Error; +use value::{Value, ValueKind}; + +pub fn parse(uri: Option<&String>, text: &str, namespace: Option<&String>) -> Result<HashMap<String, Value>, Box<Error>> { + // Parse a JSON object value from the text + let mut root: serde_json::Value = serde_json::from_str(text)?; + + // Limit to namespace + if let Some(namespace) = namespace { + root = serde_json::Value::Object(match root { + serde_json::Value::Object(ref mut table) => { + if let Some(serde_json::Value::Object(table)) = table.remove(namespace) { + table + } else { + serde_json::Map::new() + } + } + + _ => { + serde_json::Map::new() + } + }); + }; + + // TODO: Have a proper error fire if the root of a file is ever not a Table + let value = from_json_value(uri, &root); + match value.kind { + ValueKind::Table(map) => Ok(map), + + _ => Ok(HashMap::new()), + } +} + +fn from_json_value(uri: Option<&String>, value: &serde_json::Value) -> Value { + match *value { + serde_json::Value::String(ref value) => Value::new(uri, ValueKind::String(value.clone())), + + serde_json::Value::Number(ref value) => { + if let Some(value) = value.as_i64() { + Value::new(uri, ValueKind::Integer(value)) + } else if let Some(value) = value.as_f64() { + Value::new(uri, ValueKind::Float(value)) + } else { + unreachable!(); + } + } + + serde_json::Value::Bool(value) => Value::new(uri, ValueKind::Boolean(value)), + + serde_json::Value::Object(ref table) => { + let mut m = HashMap::new(); + + for (key, value) in table { + m.insert(key.clone(), from_json_value(uri, value)); + } + + Value::new(uri, ValueKind::Table(m)) + } + + serde_json::Value::Array(ref array) => { + let mut l = Vec::new(); + + for value in array { + l.push(from_json_value(uri, value)); + } + + Value::new(uri, ValueKind::Array(l)) + } + + serde_json::Value::Null => { + Value::new(uri, ValueKind::Nil) + } + } +} |