|
1 |
|
2 Preface: |
|
3 |
|
4 Ruby provides an automatic constant called DATA, which is an IO object |
|
5 that references all text in the current file under an __END__ token. |
|
6 |
|
7 I find it convenient to use the __END__ area to store all sorts of |
|
8 stuff, rather than have to worry about distributing separate files. |
|
9 |
|
10 |
|
11 The problem: |
|
12 |
|
13 The DATA constant is determined from whatever ruby believes $0 to be. |
|
14 It doesn't work inside of other required libraries, so you'll see stuff |
|
15 like this all the time: |
|
16 |
|
17 END = File.open( __FILE__ ).read.split( /^__END__/, 2 ).last |
|
18 |
|
19 It works, but it's more work than I want to do. |
|
20 |
|
21 |
|
22 A workaround: |
|
23 |
|
24 Chunker solves this by parsing __END__ tokens for you, and making it |
|
25 available in the form of a 'DATA_END' constant. It installs this |
|
26 constant into the class that includes Chunker, so you can use it again |
|
27 and again, assuming you use a different file for each class. |
|
28 |
|
29 It also automatically parses out other things that look like tokens, so |
|
30 you can easily have multiple, distinct documents all embedded into the |
|
31 __END__ block. |
|
32 |
|
33 |
|
34 Usage: |
|
35 |
|
36 There is no direct interface to Chunker. Just include it from a |
|
37 class to have that file's __END__ data blocks magically become DATA_* |
|
38 IO constants within that class. |
|
39 |
|
40 |
|
41 Example: |
|
42 |
|
43 This produces the string "Yep.\n". |
|
44 |
|
45 |
|
46 require 'chunker' |
|
47 class Foom |
|
48 include Chunker |
|
49 end |
|
50 |
|
51 puts Foom.new.class.const_get( :DATA_WICKED ).read |
|
52 |
|
53 __END__ |
|
54 Stuff in the END block! |
|
55 __WOW__ |
|
56 Ultimate success! |
|
57 __WICKED__ |
|
58 Yep. |
|
59 |