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use std::iter::empty;
use std::usize;
use serde_json::Value;
use {DataError, Variable, Var, Context, Template, RenderError, Pos, Output};
use {Number};
use compare::Comparable;
pub const TRUE: &'static &'static str = &"true";
pub const FALSE: &'static &'static str = &"false";
impl<'render> Variable<'render> for Value {
fn attr<'x>(&'x self, attr: &str)
-> Result<Var<'x, 'render>, DataError>
where 'render: 'x
{
use serde_json::Value::*;
match *self {
Object(ref x) => {
x.get(attr)
.map(|x| Var::borrow(x))
.ok_or(DataError::AttrNotFound)
}
_ => Err(DataError::AttrUnsupported(self.typename()))
}
}
fn index<'x>(&'x self, key: &Variable<'render>)
-> Result<Var<'x, 'render>, DataError>
where 'render: 'x
{
use serde_json::Value::*;
match *self {
Object(ref x) => {
x.get(key.as_str_key()?)
.map(|x| Var::borrow(x))
.ok_or(DataError::AttrNotFound)
}
Array(ref x) => {
x.get(key.as_int_key()?)
.map(|x| Var::borrow(x))
.ok_or(DataError::IndexNotFound)
}
_ => Err(DataError::IndexUnsupported(self.typename()))
}
}
fn as_str_key<'x>(&'x self) -> Result<&'x str, DataError> {
use serde_json::Value::*;
match *self {
String(ref s) => Ok(s),
_ => Err(DataError::StrKeyUnsupported(self.typename())),
}
}
fn as_int_key(&self) -> Result<usize, DataError> {
use serde_json::Value::*;
match *self {
Number(ref val)
if val.as_u64().map(|x| x <= usize::MAX as u64).unwrap_or(false)
=> Ok(val.as_u64().unwrap() as usize),
_ => Err(DataError::IntKeyUnsupported(self.typename())),
}
}
fn as_number(&self) -> Result<Number, DataError> {
use serde_json::Value::*;
match *self {
Number(ref val) if val.is_u64() => {
Ok(val.as_u64().unwrap().into())
}
Number(ref val) if val.is_i64() => {
Ok(val.as_i64().unwrap().into())
}
Number(ref val) if val.is_f64() => {
Ok(val.as_f64().unwrap().into())
}
_ => Err(DataError::NumberUnsupported(self.typename())),
}
}
fn as_comparable(&self) -> Result<Comparable, DataError> {
use serde_json::Value::*;
match *self {
Bool(x) => Ok(x.into()),
Number(ref val) if val.is_u64() => {
Ok(val.as_u64().unwrap().into())
}
Number(ref val) if val.is_i64() => {
Ok(val.as_i64().unwrap().into())
}
Number(ref val) => {
Ok(val.as_f64().unwrap().into())
}
String(ref s) => Ok(s[..].into()),
Array(_) => Err(DataError::ComparisonUnsupported(self.typename())),
Object(_) => Err(DataError::ComparisonUnsupported(self.typename())),
Null => Err(DataError::ComparisonUnsupported(self.typename())),
}
}
fn output(&self) -> Result<Output, DataError> {
use serde_json::Value::*;
match *self {
Null => Ok(Output::empty()),
Bool(x) => if x { Ok(TRUE.into()) } else { Ok(FALSE.into()) },
Number(ref x) => Ok(x.into()),
String(ref s) => Ok(s.into()),
Array(_) => Err(DataError::OutputUnsupported(self.typename())),
Object(_) => Err(DataError::OutputUnsupported(self.typename())),
}
}
fn typename(&self) -> &'static str {
use serde_json::Value::*;
match *self {
Null => "null",
Bool(_) => "bool",
Number(_) => "number",
String(_) => "string",
Array(_) => "array",
Object(_) => "object",
}
}
fn as_bool(&self) -> Result<bool, DataError> {
use serde_json::Value::*;
match *self {
Null => Ok(false),
Bool(x) => Ok(x),
Number(ref x) => Ok(x.as_u64().map(|x| x != 0).unwrap_or(true)),
String(ref s) => Ok(s.len() > 0),
Array(ref a) => Ok(a.len() > 0),
Object(ref o) => Ok(o.len() > 0),
}
}
fn iterate<'x>(&'x self)
-> Result<Box<Iterator<Item=Var<'x, 'render>>+'x>, DataError>
where 'render: 'x
{
use serde_json::Value::*;
match *self {
Null => Ok(Box::new(empty())),
Bool(..) | Number(..) | String(..) | Object(..)
=> Err(DataError::IterationUnsupported(self.typename())),
Array(ref a) => Ok(Box::new(
a.iter().map(|x| Var::borrow(x)))),
}
}
fn iterate_pairs<'x>(&'x self)
-> Result<Box<Iterator<Item=(Var<'x, 'render>, Var<'x, 'render>)>+'x>,
DataError>
where 'render: 'x
{
use serde_json::Value::*;
match *self {
Null => Ok(Box::new(empty())),
Bool(..) | Number(..) | String(..) | Array(..)
=> Err(DataError::IterationUnsupported(self.typename())),
Object(ref o) => Ok(Box::new(
o.iter().map(|(k, v)| (Var::borrow(k), Var::borrow(v))))),
}
}
}
pub fn render_json(tpl: &Template, json: &Value) -> Result<String, RenderError>
{
match json.as_object() {
Some(map) => {
let mut ctx = Context::new();
for (k, v) in map {
ctx.set(k, v);
}
tpl.render(&ctx)
}
None => {
Err(RenderError::Data(vec![
(Pos { line: 0, column: 0 },
DataError::Custom("render_json expects a JSON object".into()))
]))
}
}
}