Download as PDF, PPTX
![State Machine
state = 'go';
stack = [];
try {
for (;;) {
r = tx.exec(source);
if (!r) {
break;
}
if (r[1]) {
action[r[1]][state]();
} else if (r[2]) {
value = +r[2];
number[state]();
} else {
value = debackslashify(r[3]);
string[state]();
}
source = source.slice(r[0].length);
}
}](https://image.slidesharecdn.com/jsonsaga-100605143125-phpapp02-111030153145-phpapp01/75/Jsonsaga-100605143125-phpapp02-25-2048.jpg)
![Eval
if (/^[],:{}s]*$/.test(text.replace(
/(?:["/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace(
/"[^"nr]*"|true|false|null|-?d+(?:.d*)?(?:[eE][+-
]?d+)?/g, ']').
replace(/(?:^|:|,)(?:s*[)+/g, ''))) {
// In the third stage we use the eval function to compile the
// text into a JavaScript structure. The '{' operator is subject
// to a syntactic ambiguity in JavaScript: it can begin a block
// or an object literal. We wrap the text in parens to eliminate
// the ambiguity.
j = eval('(' + text + ')');](https://image.slidesharecdn.com/jsonsaga-100605143125-phpapp02-111030153145-phpapp01/75/Jsonsaga-100605143125-phpapp02-26-2048.jpg)
![Brian Reid’s Scribe
@Quote(Any damn fool)
( ) [ ] { }
< > " " ' '
@Begin(Quote)
Any damn fool
@End(Quote)
1980](https://image.slidesharecdn.com/jsonsaga-100605143125-phpapp02-111030153145-phpapp01/75/Jsonsaga-100605143125-phpapp02-56-2048.jpg)
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Jsonsaga 100605143125-phpapp02
- 1. The JSON Saga Douglas Crockford Yahoo! Inc.
- 2. I am aheretic. You have been warned.
- 3. I Discovered JSON •I do not claim to have invented JSON. It already existed in nature. • I do not claim to have been the first to discover it. • I gave it a specification and a little website. • The rest happened by itself.
- 4.
- 5.
- 6. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 7. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 8. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 9. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 10. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 11. The Very FirstJSON Message April 2001 <html><head><script> document.domain = 'fudco.com'; parent.session.receive( {to:"session", do:"test", text:"Hello world"} ); </script></head></html>
- 12. The unquoted nameproblem • ES3 has a wack reserved word policy. • Reserved words must be quoted. • I did not want to put the list of reserved words in the JSON spec, so... • All keys must be quoted. • It significantly simplified JSON. • This conforms to Python.
- 13. Nested HTML <html><head><script> document.domain ='fudco.com'; parent.session.receive( {"to":"session", "do":"test", "text":"</script>"} ); </script></head></html>
- 14. Nested HTML <html><head><script> document.domain ='fudco.com'; parent.session.receive( {"to":"session", "do":"test", "text":"</script>"} ); </script></head></html>
- 15.
- 16.
- 17. JSON was reallyuseful • Browser/server communication. • Interserver communication. • Configuration. • JSON database.
- 18. Our customers said •“Never heard of it.” • “Sorry, our company just committed to XML.” • “It is not a standard.”
- 19. I bought JSON.org •A one-page web site that described JSON. • Grammar three ways Simplified BNF Railroad diagrams Informal English • A Java reference implementation. • And then I retired.
- 20. And that’s allI did. A message format in a bottle.
- 21.
- 22. Languages • ASP • Objective CAML • ActionScript • OpenLaszlo • C • Perl • C++ • PHP • C# • Pike • ColdFusion • PL/SQL • D • pljson • Delphi • PowerShell • E • Prolog • Eiffel • Python • Erlang • Qt • Fantom • R • Go • REALbasic • Haskell • Rebol • haXe • RPG • Java • Ruby • JavaScript • Scheme • Lasso • Squeak • Lisp • Symbian • LotusScript • Tcl • Lua • Visual Basic • Objective C • Visual FoxPro
- 23. JSON is theintersection of modern programming languages • Simple values number string boolean • Sequence of values array, vector, list • Collection of named values object, record, struct, map, hash, property list
- 24. Recursive descent value = function () { // Parse a JSON value. It could be an object, an array, // a string, a number, or a word. white(); switch (ch) { case '{': return object(); case '[': return array(); case '"': return string(); case '-': return number(); default: return ch >= '0' && ch <= '9' ? number() : word(); } };
- 25. State Machine state ='go'; stack = []; try { for (;;) { r = tx.exec(source); if (!r) { break; } if (r[1]) { action[r[1]][state](); } else if (r[2]) { value = +r[2]; number[state](); } else { value = debackslashify(r[3]); string[state](); } source = source.slice(r[0].length); } }
- 26. Eval if (/^[],:{}s]*$/.test(text.replace( /(?:["/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace( /"[^"nr]*"|true|false|null|-?d+(?:.d*)?(?:[eE][+- ]?d+)?/g, ']'). replace(/(?:^|:|,)(?:s*[)+/g, ''))) { // In the third stage we use the eval function to compile the // text into a JavaScript structure. The '{' operator is subject // to a syntactic ambiguity in JavaScript: it can begin a block // or an object literal. We wrap the text in parens to eliminate // the ambiguity. j = eval('(' + text + ')');
- 27. JSON.parse • Part ofECMAScript, Fifth Edition • Available now in better browsers everywhere. • Very fast. Very reliable.
- 28. Languages • Arabic • Italian • Bulgarian • Japanese • Chinese • Korean • Czech • Persian • Dutch • Polish • French • Portuguese • German • Russian • Greek • Slovenian • Hebrew • Spanish • Hungarian • Turkish • Indonesian • Vietnamese
- 29.
- 30. Improvements • Removed comments. Dangerous practices Unnecessary complexity Alignment with YAML • Added e notation to numbers.
- 31. No version number. •JSON will not be changed. • Stability is more important than any feature we can think of. • Perhaps someday it will be replaced.
- 32.
- 33. Minimalism It can fiton the back of a business card.
- 34. The less weneed to agree on, the easier it is to interoperate.
- 35.
- 36. Lisp S-expressions 1958
- 37.
- 38. JavaScript Python NewtonScript
- 39.
- 40. XML The High PricedSpread
- 41. HTML Always bet onangle brackets.
- 42. Ask not ifit is good enough. Ask if it can be popular enough.
- 43. Maybe only something thissimple could work. John Seely Brown CTO Forum, San Francisco April 2002
- 44. Maybe only somethingthis complicated could work. InfoWorld Next-Generation Web Services II: The Applications Santa Clara September 2002
- 45. XMLsucks.org Why XMLis technologically terrible, but you have to use it anyway
- 46. XML is thestandard so shut up. SHUT UP!
- 47. XML Alternatives • JSONconfig YAML CanonML HDF SSYN OGDL SDL DL Boulder ONX SMEL Property lists ConfigObj GroovyMarkup ATerms LNML GODDAG JITTs Esis/Pyxie ConciseXML SML TexMecs A specification language Waterken doc UBF Xqueeze Ool atx Grutatxt APT txt2docbook txt2tags AsciiDoc reStructuredText Epytext EtText AFT txt2html Setext Latte Confluence Markdown SmartyPants Textile Atox CDuce MarkupMatrix WikiMl IWML SEXP sfsexp Lambda markup language SXML Better markup tXML SOX SLiP ezex Tanga (NBML) XSLScript & TerseXML Lx NiceXSL PXSL ShoXS XSCS SML MIN MINML ESPX PXML GMarkup ASN BLOB SDXF CTX ASDL WDDX REBOL • http://www.pault.com/pault/pxml/xmlalternatives.html
- 48.
- 49. It’s not evenXML! Who did this travesty? Let’s find a tree and string them up. Now. Dave Winer, 2006-12-20
- 50. any damn foolcould produce a better data format than XML James Clark, 2007-04-06
- 51. Use the righttool for the right job. When your only tool is a wrench, every problem looks like a nail.
- 52. Where did theidea come from that data should be represented by a document format?
- 53. RUNOFF .SK 1 Text processingand word processing systems typically require additional information to be interspersed among the natural text of the document being processed. This added information, called "markup", serves two purposes: .TB 4 .OF 4 .SK 1 1.#Separating the logical elements of the document; and .OF 4 .SK 1 2.#Specifying the processing functions to be performed on those elements. .OF 0 .SK 1
- 54. GML :h1.Chapter 1: Introduction :p.GMLsupported hierarchical containers, such as :ol :li.Ordered lists (like this one), :li.Unordered lists, and :li.Definition lists :eol. as well as simple structures. :p.Markup minimization (later generalized and formalized in SGML), allowed the end-tags to be omitted for the "h1" and "p" elements.
- 55.
- 56. Brian Reid’s Scribe @Quote(Anydamn fool) ( ) [ ] { } < > " " ' ' @Begin(Quote) Any damn fool @End(Quote) 1980
- 57. Scribe @techreport(PUB, key="Tesler", author="Tesler, Larry", title="PUB:The Document Compiler", year=1972, number="ON-72", month="Sep", institution="Stanford University Artificial Intelligence Project") @book(Volume3, key="Knuth", author="Knuth, Donald E.", title="Sorting and Searching", publisher="Addison-Wesley", year=1973, volume=3, series="The Art of Computer Programming", address="Reading, Mass.")
- 58.
- 59. The Software shallbe used for Good, not Evil. I'm looking at you, Osama bin Laden.
- 60. I give permissionto IBM, its customers, partners, and minions, to use JSLint for evil.
- 61. Thanks very much,Douglas! Staff Attorney, IP Law IBM Corporation
- 62.
- 63.
- 64.
- 69.