First Introduction to The Programming Language Purl. at RubyKaigi2010

7. /purl/1:1:add:0:to.json [2.0]

8. /purl/1:1:add:0:to.json [2.0]

9. /purl/1:1:add:0:to.json [2.0]

11. /purl/2:3:5:mul:add:0:to.json
[17.0]

12. /1:load:to.jpg JPEG
/1:load:to.png PNG
/1:load:to.gif GIF

13. /1:load:geom:2:to.json
[48, 48]

14. /1:load:2:load:swap:composite:to.png

15. /(fd8...6b4):gyazo:to.png

17. /1:load:18:0:48:48:crop:to.png

18. 1:load:4:blur:to.png

19. 1:load:4:dropshadow:to.png

20. 1:load:flip.x

21. 1:load:90:rotate

22. 80:80:ctx:
40:40:moveto:
40:40:40:-20:20:arc.ccw:
1:.3:0:rgb:fill:
60:20:4:circle:
0:0:0:rgb:fill:xtc:to.png

24. ( begins Macro
) ends Macro & push it to
main stack.

25. (:20:):call:0:to.json
[20]
(:20:):3:times:0:to.json
[20, 20, 20]

26. 1:load:45:rotate:dup:
(:dup:20:rotate:
48:0:0:0:extend:):5:times:
(:composite:):5:times

27. 1:load:
(:dup:48:0:0:0:extend:):3:times
:(:composite:):3:times
:(:dup:0:48:0:0:extend:):3:times
:(:composite:):3:times

36. /purl/(... > 256 chars):to.jpg
Uncacheable as a file.
Many Filesystems disallow
filenames over 256 chars.

37. /purl/(...<256chars):/:(...<256chars):to.jpg
Use '/' (nop)
or Define macros in the
server side

38. Attacker would execute any
code remotely

39. /spurl/ccd...88d/1:load:to.jpg
Only accept signed code
Not implemented in github
editon