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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)
}
}
}
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