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
/* * Copyright 2015-2016 Ben Ashford * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ //! Miscellaneous code used in numerous places use std::iter::Iterator; /// A custom String-join trait as the stdlib one is currently marked as unstable. pub trait StrJoin { /// Join an iterator of things that can be referenced as strings into a /// single owned-string by the given joining string /// /// # Example /// /// ``` /// use rs_es::util::StrJoin; /// /// let data = vec!["a", "b", "c", "d"]; /// assert_eq!("a-b-c-d", data.iter().join("-")); /// ``` /// /// This will print: `a-b-c-d` /// fn join(self, join: &str) -> String; } impl<I, S> StrJoin for I where S: AsRef<str>, I: Iterator<Item=S> { fn join(self, join: &str) -> String { let mut s = String::new(); for f in self { s.push_str(f.as_ref()); s.push_str(join); } s.pop(); s } } /// Useful macro for adding a function to supply a value to an optional field macro_rules! add_field { ($n:ident, $f:ident, $t:ty) => ( pub fn $n<T: Into<$t>>(mut self, val: T) -> Self { self.$f = Some(val.into()); self } ); } /// Useful macros for implementing `From` traits /// /// TODO: this may only be useful for Query DSL, in which case should be moved /// to that module macro_rules! from_exp { ($ft:ty, $dt:ident, $pi:ident, $ex:expr) => { impl From<$ft> for $dt { fn from($pi: $ft) -> $dt { $ex } } } } macro_rules! from { ($ft:ty, $dt:ident, $ev:ident, $pi:ident) => { from_exp!($ft, $dt, $pi, $dt::$ev($pi)); }; ($ft:ty, $dt:ident, $ev:ident) => { from!($ft, $dt, $ev, from); }; }