├── .gitignore ├── Cargo.lock ├── Cargo.toml ├── LICENSE-APACHE ├── LICENSE-MIT ├── README.md ├── Thirdparty.md └── src └── lib.rs /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | -------------------------------------------------------------------------------- /Cargo.lock: -------------------------------------------------------------------------------- 1 | # This file is automatically @generated by Cargo. 2 | # It is not intended for manual editing. 3 | version = 3 4 | 5 | [[package]] 6 | name = "pike" 7 | version = "0.1.6" 8 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "pike" 3 | version = "0.1.6" 4 | authors = ["rzvxa "] 5 | description = "A macro collection to pipe |> your functions calls, like in functional languages such as F#, Elixir and OCamel." 6 | edition = "2021" 7 | keywords = ["pipe", "function", "elixir", "macro", "composition"] 8 | license = "MIT OR Apache-2.0" 9 | readme = "README.md" 10 | repository = "https://github.com/rzvxa/pike" 11 | homepage = "https://github.com/rzvxa/pike" 12 | -------------------------------------------------------------------------------- /LICENSE-APACHE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | 203 | -------------------------------------------------------------------------------- /LICENSE-MIT: -------------------------------------------------------------------------------- 1 | Copyright (c) 2023 rzvxa 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy 4 | of this software and associated documentation files (the "Software"), to deal 5 | in the Software without restriction, including without limitation the rights 6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | copies of the Software, and to permit persons to whom the Software is 8 | furnished to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice shall be included in all 11 | copies or substantial portions of the Software. 12 | 13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | SOFTWARE. 20 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Pike - PipeLike 2 | 3 | Pike is a macro collection to pipe your functions calls, like in functional languages such as F#, Elixir and OCamel. 4 | 5 | ## Examples 6 | 7 | The pipe operator |> allows you to establish "pipelines" of functions in a flexible manner. 8 | 9 | ### TL;DR 10 | 11 | ```rust 12 | // takes a string's length, doubles it and converts it back into a string 13 | let len = pike! { 14 | "abcd" 15 | |> str::len 16 | |> (as u32) 17 | |> (times(2)) 18 | |> & 19 | |> u32::to_string 20 | }; 21 | 22 | // same as 23 | 24 | let len = times("abcd".len() as u32, 2).to_string(); 25 | ``` 26 | 27 | ```rust 28 | fn times(a: u32, b: u32) -> u32{ 29 | a * b 30 | } 31 | 32 | fn times2(n: u32) -> u32 { 33 | times(n, 2) 34 | } 35 | 36 | // Passes the preceding expression as the only argument of proceding function. 37 | let num = pike! { 38 | 2 39 | |> times2 40 | |> times2 41 | }; 42 | assert_eq!(num, 2 * 2 * 2); 43 | 44 | // Passes the preceding expression as the first argument of proceding function. 45 | // by wrapping the function in parentheses we can pass the remanining arguments by partially 46 | // calling the `times` as `times(?, 2)` and passing 2 as its first argument via the pipeline. 47 | let num = pike! { 48 | 1 49 | |> (times(2)) 50 | |> (times(3)) 51 | }; 52 | assert_eq!(num, 1 * 2 * 3); 53 | 54 | // call a method using pipelines 55 | let len = pike!("abcd" |> str::len); 56 | assert_eq!(len, "abcd".len()); 57 | 58 | // Closures can also be pipelined similar to partial functions. 59 | let c = pike! { 60 | ['a', 'b', 'c', 'd'] 61 | |> (|it: [char; 4]| it[2]) 62 | }; 63 | assert_eq!(c, 'c'); 64 | 65 | // Piping through `&` symbol would get a reference to the preceding expression. 66 | let it = "it"; 67 | let is_it = |r: &&str| it == *r; 68 | 69 | let is_it = pike! { 70 | it 71 | |> & 72 | |> is_it 73 | }; 74 | assert_eq!(is_it, true); 75 | 76 | 77 | // There are also special macros for options and results but those already have an ergonomic API for chaining. 78 | 79 | let data = pike_opt!(id |> get_cached |> fetch_local |> fetch_remote); 80 | // same as get_cached(id).or_else(|| fetch_local(id)).or_else(|| fetch_remote(id)); 81 | 82 | let result = pike_res!("http://rust-lang.org" |> download |> parse |> get_links); 83 | // same as download("http://rust-lang.org").map(parse).map(get_links); 84 | ``` 85 | 86 | 87 | ## Macros 88 | 89 | - `pike!` is the "standard" pipe macro 90 | - `pike_res!` works like `pike!` but takes only functions that return a `Result` (of the 91 | same type) and returns early if that result is an Err. Useful for combining multiple IO 92 | transformations like opening a file, reading the contents and making an HTTP request. 93 | - `pike_opt!` works like `pike!` but takes only functions that return an `Option` (of the same type). 94 | The pipeline will continue to operate on the initial value as long as `None` is returned from all functions. 95 | If a function in the pipeline returns `Some`, the macro will exit early and return that value. 96 | This can be useful if you want to try out several functions to see which can make use of that value in a specified order. 97 | 98 | ## Syntax Features 99 | 100 | Any `pike` starts with an expression as initial value and requires you 101 | to specify a function to transform that initial value. 102 | ```rust 103 | let result = pike!(2 |> times2); 104 | // same as times2(2) 105 | ``` 106 | 107 | You can get more fancy with functions, too, if you add parentheses like 108 | in a normal function call, the passed parameters will be applied to that 109 | function after the transformed value. 110 | 111 | ```rust 112 | let result = pike!(2 |> (times(2))); 113 | // same as times(2, 2) 114 | ``` 115 | 116 | You can pass closures \o/! A closure must be wrapped in parentheses as well. 117 | ```rust 118 | let result = pike! { 119 | 2 120 | |> (times(2)) 121 | |> (|i: u32| i * 2) 122 | }; 123 | // same as (|i: u32| i * 2)(time(2, 2)) 124 | ``` 125 | 126 | If you want a function to be called as a method on the transform value, just pass it as a path. 127 | 128 | ```rust 129 | let result = pike!("abcd" |> str::len); 130 | // same as "abcd".len() 131 | ``` 132 | 133 | ## License 134 | 135 | Licensed under either of 136 | 137 | * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) 138 | * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) 139 | 140 | at your option. 141 | 142 | Pike is spritual successor to [pipeline.rs](https://github.com/johannhof/pipeline.rs) and derives its license from the said project. 143 | 144 | ### Contribution 145 | 146 | Unless you explicitly state otherwise, any contribution intentionally 147 | submitted for inclusion in the work by you, as defined in the Apache-2.0 148 | license, shall be dual licensed as above, without any additional terms or 149 | conditions. 150 | -------------------------------------------------------------------------------- /Thirdparty.md: -------------------------------------------------------------------------------- 1 | Copyright (c) 2015 The pipeline.rs Developers 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy 4 | of this software and associated documentation files (the "Software"), to deal 5 | in the Software without restriction, including without limitation the rights 6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | copies of the Software, and to permit persons to whom the Software is 8 | furnished to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice shall be included in all 11 | copies or substantial portions of the Software. 12 | 13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | SOFTWARE. 20 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | //! # pipe_macros 2 | //! A small macro library that allows you to pipe functions 3 | //! similar to the pipe operator in Elixir and F# (|>) 4 | 5 | #![deny(missing_docs)] 6 | #![deny(warnings)] 7 | 8 | /// The pipe operator |> allows you to establish "pipelines" of functions in a flexible manner. 9 | /// ```rust 10 | /// use pike::pike; 11 | /// fn times(a: u32, b: u32) -> u32{ 12 | /// a * b 13 | /// } 14 | /// 15 | /// fn times2(n: u32) -> u32 { 16 | /// times(n, 2) 17 | /// } 18 | /// 19 | /// // Passes the preceding expression as the only argument of proceding function. 20 | /// let num = pike! { 21 | /// 2 22 | /// |> times2 23 | /// |> times2 24 | /// }; 25 | /// assert_eq!(num, 2 * 2 * 2); 26 | /// 27 | /// // Passes the preceding expression as the first argument of proceding function. 28 | /// // by wrapping the function in parentheses we can pass the remanining arguments by partially 29 | /// // calling the `times` as `times(?, 2)` and passing 2 as its first argument via the pipeline. 30 | /// let num = pike! { 31 | /// 1 32 | /// |> (times(2)) 33 | /// |> (times(3)) 34 | /// }; 35 | /// assert_eq!(num, 1 * 2 * 3); 36 | /// 37 | /// // call a method using pipelines 38 | /// let len = pike!("abcd" |> str::len); 39 | /// assert_eq!(len, "abcd".len()); 40 | /// 41 | /// // Closures can also be pipelined similar to partial functions. 42 | /// let c = pike! { 43 | /// ['a', 'b', 'c', 'd'] 44 | /// |> (|it: [char; 4]| it[2]) 45 | /// }; 46 | /// assert_eq!(c, 'c'); 47 | /// 48 | /// // Piping through `&` symbol would get a reference to the preceding expression. 49 | /// let it = "it"; 50 | /// let is_it = |r: &&str| it == *r; 51 | /// 52 | /// let is_it = pike! (it |> & |> is_it); 53 | /// assert_eq!(is_it, true); 54 | /// 55 | /// // takes a string length, doubles it and converts it back into a string 56 | /// let len = pike! { 57 | /// "abcd" 58 | /// |> str::len 59 | /// |> (as u32) 60 | /// |> (times(2)) 61 | /// |> & 62 | /// |> u32::to_string 63 | /// }; 64 | /// 65 | /// assert_eq!(len, "8"); 66 | /// ``` 67 | #[macro_export] 68 | macro_rules! pike { 69 | ($head:tt $(|> $funs_head:tt $(:: $funs_tail:tt)* $(! $($bang:tt)?)?)+) => { 70 | { 71 | let ret = $head; 72 | $( 73 | let ret = $crate::__internal_pike_fun!($($($bang)? !, )? $funs_head $(:: $funs_tail)*, ret); 74 | )+ 75 | ret 76 | } 77 | } 78 | } 79 | 80 | /// Works similar to `pike` but `pike_res` exits the pipeline early if a function returns an Err() 81 | /// ```rust,ignore 82 | /// let result = pike_res!("http://rust-lang.org" |> download |> parse |> get_links); 83 | /// ``` 84 | #[macro_export] 85 | macro_rules! pike_res { 86 | ($head:tt $(|> $funs_head:tt $(:: $funs_tail:tt)*)+) => { 87 | { 88 | let ret = Ok($head); 89 | $( 90 | let ret = match ret { 91 | Ok(x) => $crate::__internal_pike_fun!($funs_head $(:: $funs_tail)*, x), 92 | _ => ret 93 | }; 94 | )* 95 | ret 96 | } 97 | }; 98 | } 99 | 100 | /// Works similar to `pike` but `pike_opt` keeps going as long as the proceding functions retuns `None`. 101 | /// Returns the first `Some` value. 102 | /// ```rust,ignore 103 | /// let data = pike_opt!(id |> get_cached |> fetch_local |> fetch_remote); 104 | /// ``` 105 | #[macro_export] 106 | macro_rules! pike_opt { 107 | ($head:tt $(|> $funs_head:tt $(:: $funs_tail:tt)*)+) => { 108 | { 109 | let ret = None; 110 | $( 111 | let ret = match ret { 112 | None => $crate::__internal_pike_fun!($funs_head $(:: $funs_tail)*, $head), 113 | _ => ret 114 | }; 115 | )* 116 | ret 117 | } 118 | }; 119 | } 120 | 121 | /// Internal 122 | #[macro_export] 123 | macro_rules! __internal_pike_fun { 124 | (&, $ret:expr) => { 125 | &$ret 126 | }; 127 | ((as $typ:ty), $ret:expr) => { 128 | $ret as $typ 129 | }; 130 | (($funs_head:tt $(:: $funs_tail:tt)* ($($arg:expr),*)), $ret:expr) => { 131 | $funs_head $(:: $funs_tail)* ($ret $(,$arg)*) 132 | }; 133 | (($fun:ident!($($arg:expr),*)), $ret:expr) => { 134 | $fun!($ret $(,$arg)*) 135 | }; 136 | (($fun:expr), $ret:expr) => { 137 | $fun($ret) 138 | }; 139 | ($fun:path, $ret:expr) => { 140 | $fun($ret) 141 | }; 142 | (!, $fun:ident, $ret:expr) => { 143 | $fun!($ret) 144 | } 145 | } 146 | 147 | #[cfg(test)] 148 | mod test_pike_opt { 149 | fn times2(a: u32) -> Option { 150 | return Some(a * 2); 151 | } 152 | 153 | fn nope(_a: u32) -> Option { 154 | return None; 155 | } 156 | 157 | #[test] 158 | fn accepts_options() { 159 | let ret = pike_opt!(4 |> times2); 160 | 161 | assert_eq!(ret, Some(8)); 162 | } 163 | 164 | #[test] 165 | fn accepts_unwrap() { 166 | let ret = pike_opt!(4 |> times2).unwrap(); 167 | 168 | assert_eq!(ret, 8); 169 | } 170 | 171 | #[test] 172 | fn exits_early() { 173 | let ret = pike_opt! { 174 | 4 175 | |> times2 176 | |> times2 177 | |> times2 178 | }; 179 | 180 | assert_eq!(ret, Some(8)); 181 | } 182 | 183 | #[test] 184 | fn goes_until_some() { 185 | let ret = pike_opt! { 186 | 4 187 | |> nope 188 | |> nope 189 | |> (|_i: u32| None) 190 | |> times2 191 | |> nope 192 | }; 193 | 194 | assert_eq!(ret, Some(8)); 195 | } 196 | 197 | #[test] 198 | fn ends_with_none() { 199 | let ret = pike_opt! { 200 | 4 201 | |> nope 202 | |> nope 203 | |> (|_i| None) 204 | |> nope 205 | }; 206 | 207 | assert_eq!(ret, None); 208 | } 209 | } 210 | 211 | #[cfg(test)] 212 | mod test_pike_res { 213 | fn times2(a: u32) -> Result { 214 | return Ok(a * 2); 215 | } 216 | 217 | fn fail_if_over_4(a: u32) -> Result { 218 | if a > 4 { 219 | return Err("This number is larger than four".to_string()); 220 | } 221 | return Ok(a); 222 | } 223 | 224 | #[test] 225 | fn accepts_results() { 226 | let ret = pike_res!(4 |> times2); 227 | 228 | assert_eq!(ret, Ok(8)); 229 | } 230 | 231 | #[test] 232 | fn accepts_unwrap() { 233 | let ret = pike_res!(4 |> times2).unwrap(); 234 | 235 | assert_eq!(ret, 8); 236 | } 237 | 238 | #[test] 239 | fn chains_result_values() { 240 | let ret = pike_res! { 241 | 4 242 | |> times2 243 | |> times2 244 | |> times2 245 | }; 246 | 247 | assert_eq!(ret, Ok(32)); 248 | } 249 | 250 | #[test] 251 | fn exits_early() { 252 | let ret = pike_res! { 253 | 4 254 | |> times2 255 | |> fail_if_over_4 256 | |> times2 257 | |> times2 258 | }; 259 | 260 | assert_eq!(ret, Err("This number is larger than four".to_string())); 261 | } 262 | } 263 | 264 | #[cfg(test)] 265 | mod test_pike { 266 | fn times2(a: u32) -> u32 { 267 | return a * 2; 268 | } 269 | 270 | fn times(a: u32, b: u32, c: u32) -> u32 { 271 | return a * b * c; 272 | } 273 | 274 | #[test] 275 | fn test_int() { 276 | let multiply = |i: u32| i * 2; 277 | let ret = pike! { 278 | 4 279 | |> times2 280 | |> (|i: u32| i * 2) 281 | |> multiply 282 | |> (times(100, 10)) 283 | }; 284 | 285 | assert_eq!(ret, 32000); 286 | } 287 | 288 | #[test] 289 | fn test_string() { 290 | let ret = pike! { 291 | "abcd" 292 | |> str::len 293 | |> (as u32) 294 | |> times2 295 | |> (times(100, 10)) 296 | |> & 297 | |> u32::to_string 298 | }; 299 | 300 | //let ret = "abcd"; 301 | //let ret = ret.len(); 302 | //let ret = ret as u32; 303 | //let ret = times2(ret); 304 | //let ret = times(ret, 100, 10); 305 | //let ret = ret.to_string(); 306 | 307 | assert_eq!(ret, times(times2("abcd".len() as u32), 100, 10).to_string()); 308 | assert_eq!(ret, "8000"); 309 | } 310 | 311 | #[test] 312 | fn test_macro() { 313 | let mut ret; 314 | macro_rules! test_macro_a { 315 | ($it:expr) => { 316 | ret = Some($it) 317 | }; 318 | } 319 | 320 | macro_rules! test_macro_b { 321 | ($it:expr, $arg:expr) => { 322 | ret = Some($it * $arg) 323 | }; 324 | } 325 | let multiply = |i: u32| i * 2; 326 | pike! { 327 | 4 328 | |> times2 329 | |> (|i: u32| i * 2) 330 | |> multiply 331 | |> test_macro_a! 332 | }; 333 | 334 | assert_eq!(ret, Some(32)); 335 | 336 | pike! { 337 | 4 338 | |> times2 339 | |> (|i: u32| i * 2) 340 | |> multiply 341 | |> (test_macro_b!(10)) 342 | }; 343 | 344 | assert_eq!(ret, Some(320)); 345 | } 346 | } 347 | --------------------------------------------------------------------------------