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showdown.js 11 KB

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  1. //
  2. // showdown.js -- A javascript port of Markdown.
  3. //
  4. // Copyright (c) 2007 John Fraser.
  5. //
  6. // Original Markdown Copyright (c) 2004-2005 John Gruber
  7. // <http://daringfireball.net/projects/markdown/>
  8. //
  9. // Redistributable under a BSD-style open source license.
  10. // See license.txt for more information.
  11. //
  12. // The full source distribution is at:
  13. //
  14. // A A L
  15. // T C A
  16. // T K B
  17. //
  18. // <http://www.attacklab.net/>
  19. //
  20. //
  21. // Wherever possible, Showdown is a straight, line-by-line port
  22. // of the Perl version of Markdown.
  23. //
  24. // This is not a normal parser design; it's basically just a
  25. // series of string substitutions. It's hard to read and
  26. // maintain this way, but keeping Showdown close to the original
  27. // design makes it easier to port new features.
  28. //
  29. // More importantly, Showdown behaves like markdown.pl in most
  30. // edge cases. So web applications can do client-side preview
  31. // in Javascript, and then build identical HTML on the server.
  32. //
  33. // This port needs the new RegExp functionality of ECMA 262,
  34. // 3rd Edition (i.e. Javascript 1.5). Most modern web browsers
  35. // should do fine. Even with the new regular expression features,
  36. // We do a lot of work to emulate Perl's regex functionality.
  37. // The tricky changes in this file mostly have the "attacklab:"
  38. // label. Major or self-explanatory changes don't.
  39. //
  40. // Smart diff tools like Araxis Merge will be able to match up
  41. // this file with markdown.pl in a useful way. A little tweaking
  42. // helps: in a copy of markdown.pl, replace "#" with "//" and
  43. // replace "$text" with "text". Be sure to ignore whitespace
  44. // and line endings.
  45. //
  46. //
  47. // Showdown usage:
  48. //
  49. // var text = "Markdown *rocks*.";
  50. //
  51. // var converter = new Showdown.converter();
  52. // var html = converter.makeHtml(text);
  53. //
  54. // alert(html);
  55. //
  56. // Note: move the sample code to the bottom of this
  57. // file before uncommenting it.
  58. //
  59. //
  60. // Showdown namespace
  61. //
  62. var Showdown={extensions:{}},forEach=Showdown.forEach=function(a,b){if(typeof a.forEach=="function")a.forEach(b);else{var c,d=a.length;for(c=0;c<d;c++)b(a[c],c,a)}},stdExtName=function(a){return a.replace(/[_-]||\s/g,"").toLowerCase()};Showdown.converter=function(a){var b,c,d,e=0,f=[],g=[];if(typeof module!="undefind"&&typeof exports!="undefined"&&typeof require!="undefind"){var h=require("fs");if(h){var i=h.readdirSync((__dirname||".")+"/extensions").filter(function(a){return~a.indexOf(".js")}).map(function(a){return a.replace(/\.js$/,"")});Showdown.forEach(i,function(a){var b=stdExtName(a);Showdown.extensions[b]=require("./extensions/"+a)})}}a&&a.extensions&&Showdown.forEach(a.extensions,function(a){typeof a=="string"&&(a=Showdown.extensions[stdExtName(a)]);if(typeof a!="function")throw"Extension '"+a+"' could not be loaded. 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