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
137
138
139
140
141
142
143
144

#![feature(proc_macro)]
#![feature(test)]

// For tests
#[allow(unused_imports)]
extern crate bytes;
#[allow(unused_imports)]
#[macro_use] extern crate fuel_line_derive;
#[allow(unused_imports)]
extern crate uuid;
extern crate test;

pub trait Render {
  fn render(&self) -> String;
}

#[macro_export]
macro_rules! templatify {
  ( $head_template:expr $(;$key:expr; $template:expr)* ) => {
    {
      let mut total_length = 0;
      total_length = total_length + $head_template.len();

      $(
        total_length = total_length + $key.len() + $template.len();
      )*

      let mut output_string = String::with_capacity(total_length);
      output_string.push_str($head_template);

      $(
        output_string.push_str($key);
        output_string.push_str($template);
      )*

      output_string
    }
  }
}

#[macro_export]
macro_rules! templatify_buffer {
  ( $buffer:ident, $head_template:expr $(;$key:expr; $template:expr)* ) => {
    {
      let mut total_length = 0;
      total_length = total_length + $head_template.len();

      $(
        total_length = total_length + $key.len() + $template.len();
      )*

      $buffer.reserve(total_length);
      $buffer.put($head_template);

      $(
        $buffer.put($key);
        $buffer.put($template);
      )*
    }
  }
}

#[cfg(test)]
mod tests {
  #![feature(proc_macro)]

  use bytes::{BytesMut, BufMut};
  use test::Bencher;
  use Render;
  use uuid::Uuid;

  #[test]
  fn templatify_should_work() {
    let world = "world";
    let results: String = templatify! { "hello, "; world ;"!" };
    assert!(results == "hello, world!");
  }

  #[test]
  fn templatify_buffer_should_work() {
    let mut buf = BytesMut::new();

    let world = "world";
    templatify_buffer! { buf, "hello, "; world ;"!" };
    assert!(buf == "hello, world!");
  }

  #[test]
  fn render_derive_should_work() {

    #[derive(Render)]
    #[TemplateName = "./fuel_line/test_data/test.html"]
    struct TestStruct {
      a: String,
      b: String
    };

    let t = TestStruct {
      a: "a_value".to_owned(),
      b: "b_value".to_owned()
    };

    assert!(t.render() == "<h1>b_value</h1>\n<p>a_value</p>\n");
  }

  #[bench]
  fn bench_render_derive(bencher: &mut Bencher) {
    #[derive(Render)]
    #[TemplateName = "./fuel_line/test_data/bench_template.txt"]
    struct BenchTemplate {
      a: String,
      b: String
    }

    let mut t = BenchTemplate {
      a: "".to_owned(),
      b: "Title".to_owned()
    };

    bencher.iter(|| {
      let a = Uuid::new_v4().to_string();
      t.a = a;

      t.render()
    });
  }

  #[bench]
  fn bench_buffer_concat(bencher: &mut Bencher) {
    let b = "Title";

    bencher.iter(|| {
      let a = Uuid::new_v4().to_string();

      let mut url = String::with_capacity(1 + ": ".len() + a.len() + b.len());
      url.push_str(b);
      url.push_str(": ");
      url.push_str(&a);
      url.push_str("\n");
      url
    });
  }
}