trim.ha (1124B)
1 // SPDX-License-Identifier: MPL-2.0 2 // (c) Hare authors <https://harelang.org> 3 4 // Returns a slice (borrowed from given input slice) after trimming off of 5 // the start of the input slice the bytes in the given list. 6 export fn ltrim(in: []u8, trim: u8...) []u8 = { 7 let i = 0z; 8 for (i < len(in) && contains(trim, in[i]); i+= 1) void; 9 return in[i..]; 10 }; 11 12 // Returns a slice (borrowed from given input slice) after trimming off of 13 // the end of the input slice the bytes in the given list. 14 export fn rtrim(in: []u8, trim: u8...) []u8 = { 15 let i = len(in) - 1; 16 for (i < len(in) && contains(trim, in[i]); i -= 1) void; 17 return in[..i + 1]; 18 }; 19 20 // Returns a slice (borrowed from given input slice) after trimming off of 21 // the both ends of the input slice the bytes in the given list. 22 export fn trim(in: []u8, trim: u8...) []u8 = ltrim(rtrim(in, trim...), trim...); 23 24 @test fn trim() void = { 25 assert(equal(trim([0, 1, 2, 3, 5, 0], 0), [1, 2, 3, 5])); 26 assert(equal(trim([1, 2, 3, 5], 0), [1, 2, 3, 5])); 27 assert(equal(trim([0, 0, 0], 0), [])); 28 assert(equal(trim([0, 5, 0], 5), [0, 5, 0])); 29 assert(equal(trim([], 0), [])); 30 };