mime.files.aliases source code

1 /**
2  * Parsing mime/aliases files.
3  * Authors:
4  *  $(LINK2 https://github.com/FreeSlave, Roman Chistokhodov)
5  * License:
6  *  $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
7  * Copyright:
8  *  Roman Chistokhodov, 2015-2016
9  */
10 
11 module mime.files.aliases;
12 
13 public import mime.files.common;
14 
15 private {
16     import std.algorithm;
17     import std.exception;
18     import std.range;
19     import std.traits;
20     import std.typecons;
21 }
22 
23 ///Represents one line in aliases file.
24 alias Tuple!(string, "aliasName", string, "mimeType") AliasLine;
25 
26 /**
27  * Parse mime/aliases file by line ignoring empty lines and comments.
28  * Returns:
29  *  Range of $(D AliasLine) tuples.
30  * Throws:
31  *  $(D mime.files.common.MimeFileException) on parsing error.
32  */
33 auto aliasesFileReader(Range)(Range byLine) if(isInputRange!Range && is(ElementType!Range : string)) {
34     return byLine.filter!(lineFilter).map!(function(string line) {
35         auto splitted = std.algorithm.splitter(line);
36         if (!splitted.empty) {
37             auto aliasName = splitted.front;
38             splitted.popFront();
39             if (!splitted.empty) {
40                 auto mimeType = splitted.front;
41                 return AliasLine(aliasName, mimeType);
42             }
43         }
44         throw new MimeFileException("Malformed aliases file: must be 2 words per line", line);
45     });
46 }
47 
48 ///
49 unittest
50 {
51     string[] lines = ["application/acrobat application/pdf", "application/ico image/vnd.microsoft.icon"];
52     auto expected = [AliasLine("application/acrobat", "application/pdf"), AliasLine("application/ico", "image/vnd.microsoft.icon")];
53     assert(equal(aliasesFileReader(lines), expected));
54 
55     assertThrown!MimeFileException(aliasesFileReader(["application/aliasonly"]).array, "must throw");
56 }