1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use std::io::Write;
use compiler;
use parser;
use rustc_serialize::json::Json;
use rustc_serialize::json::Json::{Boolean, Null, I64, U64, F64, Array, Object};
use rustc_serialize::json::Json::String as JString;
use build::{HashBuilder, VecBuilder};
use template::Template;

use RustacheResult;
use RustacheError::JsonError;

/// Defines a `renderable` trait, so that all of our data is renderable
pub trait Render {
    /// `render` function on a `renderable` returns a `reader`
    fn render<W: Write>(&self, template: &str, writer: &mut W) -> RustacheResult<()>;
}

/// Implement the `renderable` trait on the `HashBuilder` type
impl<'a> Render for HashBuilder<'a> {
    fn render<W: Write>(&self, template: &str, writer: &mut W) -> RustacheResult<()> {
        // Create our nodes
        let tokens = compiler::create_tokens(template);
        let nodes = parser::parse_nodes(&tokens);

        // Render and write out
        Template::new().render_data(writer, self, &nodes)
    }
}


/// Implement the `renderable` trait on the JSON type
impl Render for Json {
    fn render<W: Write>(&self, template: &str, writer: &mut W) -> RustacheResult<()> {
        parse_json(self).render(template, writer)
    }
}

impl Render for ToString {
    fn render<W: Write>(&self, template: &str, writer: &mut W) -> RustacheResult<()> {

        let json = match Json::from_str(&self.to_string()) {
            Ok(json) => json,
            Err(err) => return Err(JsonError(format!("Invalid JSON. {}", err))),
        };

        parse_json(&json).render(template, writer)
    }
}

// parses a Rust JSON hash and matches all possible types that may be passed in
// returning a HashBuilder
fn parse_json(json: &Json) -> HashBuilder {
    let mut data = HashBuilder::new();
    for (k, v) in json.as_object().unwrap().iter() {
        match *v {
            I64(num) => {
                data = data.insert(&k[..], num.to_string());
            }
            U64(num) => {
                data = data.insert(&k[..], num.to_string());
            }
            F64(num) => {
                data = data.insert(&k[..], num.to_string());
            }
            Boolean(val) => {
                data = data.insert(&k[..], val);
            }
            Array(ref list) => {
                let mut builder = VecBuilder::new();
                for item in list.iter() {
                    builder = match *item {
                        Object(_) => builder.push(parse_json(item)),
                        Array(_) => builder.push(parse_json_vector(item)),
                        JString(_) => builder.push(item.as_string().unwrap()),
                        Boolean(_) => builder.push(item.as_boolean().unwrap()),
                        _ => builder,
                    }
                }
                data = data.insert(&k[..], builder);
            }
            Object(_) => {
                data = data.insert(&k[..], parse_json(v));
            }
            Null => {}
            JString(ref text) => {
                data = data.insert(&k[..], &text[..]);
            }
        }
    }

    data
}

// parses a Rust JSON vector and matches all possible types that may be passed in
// returning a VecBuider
fn parse_json_vector(json: &Json) -> VecBuilder {
    let mut data = VecBuilder::new();
    for v in json.as_array().unwrap().iter() {
        match *v {
            I64(num) => {
                data = data.push(num.to_string());
            }
            U64(num) => {
                data = data.push(num.to_string());
            }
            F64(num) => {
                data = data.push(num.to_string());
            }
            Boolean(val) => {
                data = data.push(val);
            }
            Array(ref list) => {
                let mut builder = VecBuilder::new();
                for item in list.iter() {
                    builder = match *item {
                        Object(_) => builder.push(parse_json(item)),
                        Array(_) => builder.push(parse_json_vector(item)),
                        JString(_) => builder.push(item.as_string().unwrap()),
                        Boolean(_) => builder.push(item.as_boolean().unwrap()),
                        _ => builder,
                    }
                }
                data = data.push(builder);
            }
            Object(_) => {
                data = data.push(parse_json(v));
            }
            Null => {}
            JString(ref text) => {
                data = data.push(&text[..]);
            }
        }
    }
    data
}