Java Script Object eXchange.
npm install jsox
100% Compatible reader for JSON. JSOX.stringify cannot generate JSON
compatible output; it would lose all the features anyway; use existingJSON.stringify() if required, all JSON(JSON3/JSON5/JSON6) is valid JSOX.
JSOX adds Map, BigInt, Date, and TypeArray transport support, cyclic
objects, and includes keywords (5)'Infinity', (5)'NaN', (6)'undefined'.
JSOX adds optional processing of typed data. Type names can be applied
to Objects, Arrays and Strings. Type names are defined and provided with
to/from JSOX handlers by users of this library. The data, decoded as
the object '{}', array '[]', or string '""' is passed to the fromJSOX
handler, and the resulting value returned as the decoded object.
Typed-objects may also be emitted as a class-definition and then class-references.
A class-definition defines the fields in the object, and a class-reference would
provide the values for each field respectively.
A typed-object example: v{ x, y } { a : v{1,2} }, which decodes as { a : {x:1,y:2} }.
It defines a template/class of object that has fields 'x', and 'y'. Then
defines an object with a field A what is a object of type 'v', with values
(1), and (2). This example does not gain any visible savings; savings
comes when you have a lot of the same sort of record with the same field
names repeated often.
* adds macro/class support for object field names.
* adds support for bigint numbers; indicated with an 'n' suffix.
* adds support for Date parsing and stringification; ISO dates as used are a sub-type of Number.
* adds support for circular references.
* typed-strings, typed-arrays, and typed-objects, for user defined types and to and from JSOX methods. more
C style commants; // and / */.
* string continuations using \ at the end of the line removes the newline; Otherwise strings continue until the next quote.
* ", ', , are all valid quote pairings, with no differnce in meaning, other than the quotes they contain.
* adds optional underscores in numbers, allowing user formatting of log numbers.
* fields are canonically ordered, so all objects that have the same field names will have their names in the same order. Keys in Map()s are not ordered.
* trailing commas are allowed, and silently ignored; however empty comma pairs in arrays will generate empty elements; and (throw an error in objects?).
* and of course o === JSOX.parse(JSON.stringify(o)) should always be exactly true.
``
r = JSOX.stringify( o = {
a: "simple object"
, b:3
, c:new Date()
, d:123n
, e:null
, f:undefined
, g:NaN
, h:Infinity
, i:-Infinity
, j:-0.302
, k:new Uint8Array(9)}, null, 3 );
cnsole.log( "pretty:", o, "=\n", r );
// -- output --
pretty:
{
a: "simple object",
b: 3,
c: 2018-09-14T02:55:27-07:00,
d: 123n,
e: null,
g: NaN,
h: Infinity,
i: -Infinity,
j: -0.302,
k: u8[AAAAAAAAAAA=]
}
`
JSOX is a proposed replacement to JSON that aims to make it easier for
humans to write and maintain by hand, while also transporting the correct
type of the data. Humans, for example, wouldn't hand-code a base64 encoding
for a TypedArray; however sending a mesh from a server to a client already
processed as a typed buffer ready for WebGL consumption may be of use.
The class/tag support is entirely optional, and while it's goal is to reduce redundancy,
which for large datasets of similar records can benefit, it has been argued
that gzip could just be used to reduce the size; However, this also reduces
the size of the data to be parsed on input, which gzip does not do.
JSOX is a (super-sub)set of JavaScript, although adds no new data types,
and works with all existing JSON content. Some features allowed in JSOX
are not directly supported by Javascript; although all javascript parsable
features can be used in JSOX, except functions or any other code construct,
transporting only data saved as JSON. Most ES6 structure can be parsed,
with the extension of classes/macro-tags the reverse is not true. It was true for
JSON6.
JSOX is a proposal for an official successor to JSON, and JSOX stringified
content will not work with existing JSON parsers. For this reason, JSOX
files use a new .jsox extension. (TODO: new MIME type needed too.)
The code is a reference JavaScript implementation for both Node.js
and all browsers. The code is derrived from JSON-6 sources.
Beyond the existing reasons for JSON5/JSON6 for their modifications; this
addresses the biggest shortcoming of JSON, which is the repetitive and redundant
specification of field names; especially when lots of the same sort of object
is represented.
This also aims to provide support for BigInt and Date format for less work
at the application layer. **A method for handling typed array object members
should also be implemented**
(Historic Why below)
JSON isn’t the friendliest to write. Keys need to be quoted, objects and
arrays can’t have trailing commas, and comments aren’t allowed — even though
none of these are the case with regular JavaScript today.
That was fine when JSON’s goal was to be a great data format, but JSON’s usage
has expanded beyond machines. JSON is now used for writing [configs][ex1],
[manifests][ex2], even [tests][ex3] — all by humans.
[ex1]: http://plovr.com/docs.html
[ex2]: https://www.npmjs.org/doc/files/package.json.html
[ex3]: http://code.google.com/p/fuzztester/wiki/JSONFileFormat
There are other formats that are human-friendlier, like YAML, but changing
from JSON to a completely different format is undesirable in many cases.
JSON6’s aim is to remain close to JSON and JavaScript.
The following is the exact list of additions to JSON’s syntax introduced by
JSOX. All of these are optional.
- Concise representation of dates and times including as much information as is
available for the timestamp(timezone).
- Supports encode and decode of BigInt numbers with no application overhead.
- reduces overhead from none-requires quotes for identifiers.
- can further reduce overall output size by using macro tags.
JSOX.stringify will produce output that JSON.parse cannot handle; JSOX.parse
can always handle .
- BigInt encodingNumber
- ISO date/time Encoding/decoding (as part of format)
- Adds classes(revive user types) and macro tags to reduce redundant information.
- Keyword undefined
- Objects/Strings back-tick quoted strings (no template support, just quotes); Object key names can be unquoted.
- Strings - generous multiline string definition; all javascript character escapes work. \(, \0###, \u####, \u\{\} \)0
- Numbers - underscore digit separation in numbers, octal and binary formats; all javascript number notations.
Addtionally support leading to interpret as octal as C, C++ and other languages support.
- Arrays - empty members
- Streaming reader interface
- (Twice the speed of JSON5; subjective)
- interprets non-breaking space as a space.
All items listed below are JSON5 additions if not specifed as JSON6.
###
- (JSOX) Support transporting ArrayBuffer and TypedArray fields. This is implemented with constants as class user types applied prefixing an opening bracket '[' and encoding the binary data as a base64 string(without quotes) before the closing ']'.u8
- these are prefix tags that can be applied. , u16, cu8, u32, s8, s16, s32, f32, f64, ab; the array is a base64 string without quotes.
- Base64 is as dense as is feasible; it's a 33% loss; where UTF-8 encoding of random bytes is 50% loss. Something like base127 would be 7 bytes to 8 encoded bytes; and potential length penalty of 5 bytes.
- Object keys can be unquoted if they do not have ':', ']', '[', '{', '}', ',', any quote or whitespace (including non-breaking space, which on the human side of things looks the same), and do not begin like a number.
- Object keys can be single-quoted, (JSON6) or back-tick quoted; any valid string
- Object keys can be double-quoted (original JSON).
- Objects can have a single trailing comma. Excessive commas in objects will cause an exception. '{ a:123,,b:456 }' is invalid.
[mdn_variables]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Core_Language_Features#Variables
- Arrays can have trailing commas. If more than 1 is found, additional empty elements will be added.
- (JSON6) Arrays can have comma ( ['test',,,'one'] ), which will result with empty values in the empty places.
- Strings can be double-quoted (as per original JSON).
- Strings can be single-quoted.
- Strings can be back-tick ( `) (grave accent) -quoted.
- Strings can be split across multiple lines; just prefix each newline with a
backslash. ES5 [§7.8.4]
- (JSON6) all strings will continue keeping every character between the start and end, this allows multi-line strings
and keep the newlines in the string; if you do not want the newlines they can be escaped as previously mentioned.
- (JSOX) BigInt numbers are stringified and parsed as integers with a suffix of 'n' per ES2020.
- (JSON6) Numbers can have underscores separating digits '_' these are treated as zero-width-non-breaking-space. (Proposal with the exception that _ can preceed or follow . and may be trailing.)
- Numbers can be hexadecimal (base 16). ( 0x prefix )
- (JSON6) Numbers can be binary (base 2). (0b prefix)
- (JSON6) Numbers can be octal (base 8). (0o prefix)
- (JSON6) Decimal numbers can have leading zeros. (0 prefix followed by more numbers, without a decimal)
- Numbers can begin or end with a (leading or trailing) decimal point.
- Numbers can include Infinity, -Infinity, NaN.
- Numbers can begin with an explicit plus sign.
- Numbers can begin with multiple minus signs. For example, ----123 parses to 123.
- (JSOX) Encodes date time with local timestamp information to recover as much information as the original date contained. Is treated as a subtype of Number parsing; and are stored without quotes.
- (JSON6) supports 'undefined' in addition to 'true', 'false', 'null'.
- Both inline (single-line using '//' (todo:or '#'?) ) and block (multi-line using / ... / ) comments are allowed.#
- (JSOX) single line comments using ''; imposes required quoting for '#' as a field name.
`
// simple example, array buffer with 8 bytes
var ab = new ArrayBuffer([0,1,2,3,4,5,6,7]);
console.log( JSOX.stringify( {ab:new Float32Array(ab)} ) );
// example output
{ab:f32[AAECAwQFBgc=]}
`
#### Base64 Character Set
The following defines the characters used for base64 encoding and decoding.
`
const encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789$_'
// previous to 1.2.106
//const encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
const decodings = { '~':-1
,'=':-1
,'$':62
,'_':63
,'+':62
,'-':62
,'.':62
,'/':63
,',':63
};
`
The high value characters have multiple possible variations based on evaluation of what was used in wikipedia; forming the most inclusive subset.
~ or = may be used for string termination, or early string length.
#### Base64 vs UTF-8 Encoding
UTF-8, for character 0-127 requires 1 byte; 128-255 requires 2 bytes. For random data 0-255, 1.5 bytes will, on average, be used
to represent the string. So this is 150% larger than the original string. Even if like a base 2^40 bits, which would encode 5 bytes
into a single (very extended) utf8 encoding, each byte has the prefix of 2 bits 10xx xxxx, which gives 6 bits per byte used.
Base64 is 6 bits per byte used, so instead of having a complex encoder, base64 is the optimal of 3:4 byte expansion (133%) which is
the ideal that extra-long UTF-8 encoding could reach.
An alternative might be a base128 encoding, which would be close to utf-8, but would actually require 129 characters, one to indicate
the bytes that are unused. 7 bytes expand to 8, gathering the top bit of each of the 7 bytes of each one into one more byte; it could
be an optimal encoding using code points 0-128 (128 being the end terminator like '=' in base64). But, this also mean that up to 5
bytes of waste may be included. That is incomplete values at the end of the string have to be marked as unused.
Image produced by EBNF Visualizer (Windows)
from jsox.ebnf
!JSOX Value BNF
!JSOX Value BNF
!JSOX Parser BNF
The following is a contrived example, but it illustrates most of the features:
`js
{
foo: 'bar',
while: true,
nothing : undefined, // why not?
this: 'is a \
multi-line string',
thisAlso: 'is a
multi-line string; but keeps newline',
// this is an inline comment
here: 'is another', // inline comment
/* this is a block comment
that continues on another line */
hex: 0xDEAD_beef,
binary: 0b0110_1001,
decimal: 123_456_789,
octal: 0o123,
decimal: 001234, // with lead 0
half: .5,
delta: +10,
negative : ---123,
to: Infinity, // and beyond!
,,,,,, // some empty fields...
finally: 'a trailing comma',
oh: [
"we shouldn't forget",
'arrays can have',
'trailing commas too',
],
}
`
This implementation’s own package.jsox is more realistic:
`jsnpm run build
// This file is written in JSOX syntax, naturally, but npm needs a regular
// JSON file, so compile via . Be sure to keep both in sync!
{
name: 'JSOX',
version: '0.1.105',
description: 'JSON for the ES6 era.',
keywords: ['json', 'es6'],
author: 'd3x0r
contributors: [
// TODO: Should we remove this section in favor of GitHub's list?
// https://github.com/d3x0r/JSOX/contributors
],
main: 'lib/JSOX.js',
bin: 'lib/cli.js',
files: ["lib/"],
dependencies: {},
devDependencies: {
gulp: "^3.9.1",
'gulp-jshint': "^2.0.0",
jshint: "^2.9.1",
'jshint-stylish': "^2.1.0",
mocha: "^2.4.5"
},
scripts: {
build: 'node ./lib/cli.js -c package.JSOX',
test: 'mocha --ui exports --reporter spec',
// TODO: Would it be better to define these in a mocha.opts file?
},
homepage: 'http://github.com/d3x0r/JSOX/',
license: 'MIT',
repository: {
type: 'git',
url: 'https://github.com/d3x0r/JSOX',
},
}
`
Join the Google Group if you’re
interested in JSOX news, updates, and general discussion.
Don’t worry, it’s very low-traffic.
The GitHub wiki (will be) a good place to track
JSOX support and usage. Contribute freely there!
GitHub Issues is the place to
formally propose feature requests and report bugs. Questions and general
feedback are better directed at the Google Group.
This JavaScript implementation of JSOX simply provides a JSOX object justJSON
like the native ES5 object.
To use from Node:
`sh`
npm install jsox
`js`
var JSOX = require('jsox');
To use in the browser (adds the JSOX object to the global namespace):
`html`
Then in both cases, you can simply replace native JSON calls with JSOX:
`js`
var obj = JSOX.parse('{unquoted:"key",trailing:"comma",}');
var str = JSOX.stringify(obj); / uses JSON stringify, so don't have to replace /
|JSOX Methods | return | parameters | Description |
|-----|-----|-----|----|
|parse| the first value| (string [,reviver]) | supports all of the JSOX features listed above, as well as the native [reviver argument][json-parse]. | with backslashed sequences. (prevent 'JSON injection') |
|stringify| string | ( value[,replacer[,space]] ) | converts object to JSOX. [stringify][json-stringify] |
|stringifier | Stringifier(methods below)| () | Gets a utility object that can stringify. The object can have classes defined on it for stringification |
|escape | string | ( string ) | substitutes ", \, ', and \
|begin| Parser(methods below) |(cb [,reviver] ) | create a JSOX stream processor. cb is called with (value) for each value decoded from input given with write(). Optional reviver is called with each object before being passed to callback. |
|toJSOX | none | (name,Function/Class,toCb) | For each object that matches the prototype, the name is used to prefix the type; and the cb is called to get toJSOX. | Instead of setting prototype extensions, provides a way to register formatters for prototypes. These are shared for all stringifier instances, and will throw an exception if duplicate set happens. |
|fromJSOX| none | (name,Function/Class,fromCb) | fromCb is called whenever the type 'name' is revived. The type of object following the name is passd as 'this'. Will throw an exception if duplicate set happens. |
|registerToFrom | none | (name,Function/Class,toCb, fromCb) | register both to and from for the same name. |
|reset| none | () | Reset to/from types on JSOX global parser and stringifier. (should be reserved for tests) |
|Stringifier method | return | parameters | Description |
|-------|------|-----|----|
|stringify | string | (value[,replacer[,space]] ) | converts object to JSOX attempting to match objects to classes defined in stringifier. [stringify][json-stringify] |
|toJSOX | none | (name,Function/Class,toCb) | For each object that matches the prototype, the name is used to prefix the type; and the cb is called to get toJSOX. | Instead of setting prototype extensions, provides a way to register formatters for prototypes. These only applied to this one stringifier instance, and will throw an exception if duplicate set happens. |
|setQuote | none | ( quote ) | the argument passed is used as the default quote for strings and identifiers as required. |
|defineClass | none | ( name, object ) | Defines a class using name 'name' and the fields in 'object'. This allows defining for some pre-existing object; it also uses the prototype to test (if not Object), otherwise it matches based on they Object.keys() array. |
|Parser Methods | parameters | Description |
|-----|-----|-----|
|write | (buffer) | add data to the parser stream |
|reset| () | When an error is thrown from parsing a stream, the parser must be reset using reset(), otherwise it will continue throwing an error. |
|parse | (buffer) | use a parser instance to parse a single message |
|currentRef | () | Returns an object containing {o:, f:} where o is the object containing the field being revived, and f is the name of the field being revive; together this pair makes a reference to a value. |
|fromJSOX| (name,Function/Class,fromCb) | fromCb is called whenever the type 'name' is revived. The type of object following the name is passd as 'this'. Will throw an exception if duplicate set happens. |
#### Registering toJSOX : JSOX.toJSOX() or stringifier.toJSOX()
function toJSOX( name, Type, customEmitterCallback )
- name is a string
- Type is the type which should be encoded as this name.
- customEmitterCallback is called when one of these types is encountered. The callback should return a string
to emit.
toJSOX() registers a handler to convert a type to JSOX. This method is used to avoid modification of prototypes; would require instead
that ojects that have a toJSOX know of the JSOX module instead. The result of the callback should be a string, and is up to the
toJSOX method to include quotes if it is a string value. Any string may result that is valid JSOX.
Registering the same name more than once throws an error.
`` jsa is ${this.a} b is ${this.b}
function stringTest() {
this.a = 3;
this.b = 4;
}
stringifierTest.prototype.toString = function(stringifier) {
//
return ;
}
JSOX.toJSOX( "stringTest", stringTest, function(stringifier) { return '"' + this.toString() + '"' } );
`
The callback specified is passed the current value to stringify as this, and the current stringifier is passedJSOX.stringify()
as the first argument. If the structure contains cyclic references, the provided stringifier is required to be used
instead of or a new instance of a stringifier when encoding the sub-members of this object; otherwise,
the references do not properly refer to the root of the object.
#### Registering fromJSOX : JSOX.fromJSOX() or parser.fromJSOX()
fromJSOX( name, type, callback )
- name is the tag text which triggers reviving this type.
- type is the class or function used to create a new type(). The instance is always created with empty parameters.this
- callback(field,val) is called with set to the object of the type specified, and field set as the current field name being revived, val is the value being set into the field.undefined
If field is then this is the end of all fields being added to the object, and the this object may be changed to a different object; usually if( field === undefined ) return this;.
The callback is called after objects are completely revived; it is called when an array value is initially created, or immediately after resolving any other value.
Registers a handler to convert recovered string, array or object from JSOX. The converted data from the JSOX stream is passed as
'this'. The result of the callback may be any type of value; the resulting value is used instead of the data converted from JSOX.
Registering the same name more than once throws an error.
` js
// this epects a string, as indicated by the above toJSOX output.
function stringTest() {
}
// if a field callback is specified, the function must either result with
// undefined, which prevents setting the value internally, or return the same
// or a new value for the value.
// if the field is 'undefined' then must instead return 'this' or a new object
// to take the place of this one.
stringTest.fromJSOX = function(field,val) {
if( field ) {
console.log( "Resuurect from String:[%s]", this /string/ );
} else
return new stringTest( this );
}
JSOX.fromJSOX( "stringTest", stringTest, stringTest.fromJSOX );
`
#### Register toJSOX and fromJSOX for the same type
Registers both to and from methods or a spsecified name, using the specified prototype to match during stringify.
Internally, calls the above functions with the parameters split as appropriate.
Registering the same name more than once for From or To throws an error.
` js
JSOX.registerToFrom( "stringTest", stringTest
, function() { return '"' + this.toString() + '"' }
, function() {
console.log( "Resurrect from String:[%s]", this /string/ );
return new stringTest( this ); // some stringTest class with string initializer
}
);
`
typed-data is represented in the JSOX stream as \
which reduces the size of data to process. For arrays, internally, fixed types represent ES6 TypedArray types (u8, s8, u16, f32, etc);ref
Another internal type is '' which uses the array to have a list of element identifiers that define the path to the original objectcolor"0x1234568"
reference. Another, simple variation is to implement typed-strings, which allows to have a fromJSOX method that
is passed the string, and can result with a color object.
In each case, in the following example JSOX, the same 'color' fromJSOX
method will be called. It will be invoked with a string, with an array,
with an object, with an object, and with an object respectively.
`js
var JSOX = require( "JSOX" );
function Color() {
this.r = 100;
this.g = 150;
this.b = 20;
}
// notice that the literal quotes to result as output are returned here.
// this allows the encoder to use an object {}, an array [] or a string ""
// to pass to the reviver function.
JSOX.registerToFrom( "color", Color.prototype, function() { return '"#'+this.r.toString(16)+this.g.toString(16)+this.b.toString(16)+ '"'; }
, function() { return '"#'+this.r.toString(16)+this.g.toString(16)+this.b.toString(16)+ '"'; }
);
var c = new Color();
JSOX.stringify( c ) ); // result is 'color"#649614"'
JSOX.parse( JSOX.stringify( c ) ); // result is 'Color { r: 100, g: 150, b: 20 }' (console.log)
`
`js
// this are all variations which may be used to revive a color object
color"0x12345678" // typed-string
color[0x12,0x34,0x56,0x78] // typed-array
// at a root level, the first 'color' definition encountered
// is used to create a field-name map. Then later usages
// sould only specify the values.
color{r,g,b,a} // typed-object definition
color{0x12,34,0x56,0x78} // typed-object subsequent usage
// if no typed-object definition is required, then
// the typed-object must never be used at a root level.
{ a : color{r:0x12,g:0x34,b:0x56,a:0x78} } // object containing typed-object fromJSOX only, no pre-field-definition
[ color{r:0x12,g:0x34,b:0x56,a:0x78} ] // array containing typed-object fromJSOX only, no pre-field-definition
`
Typed strings have a caveat; at a root level, strings which are typed, MUST have
unquoted-identifier strings indicating their type. Because the closing quote is
a definitive end-of-data marker, quoted strings at a root level always emit as a
completed string; This also requires no space between the unquoted-identifier string
and the quoted data string.
Typed-object and typed-arrays also require the identifer or string used for their
type information not be followed by a space before the opening '{', '\[' or quoted
string.
Macro Tags are similar to class names, but define a set of field names to use for each subsequent use of the same number.
The names used for class names and for Macro tags may overlap, and then the macro objects are also revived as specified
user types. If only a Macro Tag is used, then all objects revived with that tag have the same prototype, which may be
extended in-place for all such objects.
The definition of a Macro Tag is an identifer at the top level (before the JSOX data) followed immediately by an open brace ('{'),{
whitespace is not allowed. Within the open brace '' until the close brace '}' is a list of names separated by commas.:
If a colon() is encountered before the first comma(,) , then instead of behaving as a Macro definition, the
object is revived as a named user type class instead.
All subsequent references to the defined tag are followed by '{' until the close '}', is a list of comma separated values.
Each value is assign the name in the order it was defined at the definition. This is effectively a 'zip' operation between the names
specfied at the start, and the values specified later.
All objects created with a class/tag definition shares the same prototype.
` bnf
tagdef : identifier '{' identifier [ ',' identifier ] ... '}'
`
A class revival is similar, but includes both the identifer and value for each entry.
` bnf`
userType : identifier '{' identifier ':' value [ ',' identifier ':' value ] ... '}'
Usage of tags is done by specifing their identifer followed by an open brace '{' in the value
field of an object definition; or at a top level referencing the same tag name already defined.
For each field defined in the class, a value is expected. If a value is not found, the field
will not be added, as if receiving field:undefined.
` bnf`
tag usage : ':' identifier '{' value [ ',' value ]... '}'
` js
//-- the following...
a{ firstField, secondField }
a{ 1, 2 }
//-- results as
{ firstField : 1, secondField : 2 }
//-- the following...
a { firstField, secondField }
[ a { 1, 2 }, a(5,6), a("val1","val2") ]
//-- results as
[ { firstField : 1, secondField : 2 }, { firstField : 5, secondField : 6 }, { firstField : "val1", secondField : "val2" } ]
`
Implementation of tags allows apply a class to arrays. Arrays have a class of ArrayBuffer, or other TypedArray type. The
representation path in an array and a reference type for the array. This allows circular encoding.
` js
// this is a string with a reference.
{company:{name:"Example.com",employees:[{name:"bob"},{name:"tom"}],manager:ref["company","employees",0]}}
// The above 'ref[]' gets resolved into the same employee object...
OUT: ./file6.jsox { company:
{ name: 'Example.com',
employees: [ /a/{ name: 'bob' }, { name: 'tom' } ],
manager: /a/{ name: 'bob' } } }
`
A Parser that returns objects as they are encountered in a stream can be created. JSON.begin( dataCallback, reviver ); The callback is called for each complete object in a stream of data that is passed.
JSOX.begin( cb, reviver ) returns an object with a few methods.
| Method | Arguments | Description |
|:---|:---|:---|
| write | (string) | Parse string passed and as objects are found, invoke the callback passed to begin() Objects are passed through optional reviver function passed to begin(). |write()
| \_write | (string,completeAtEnd) | Low level routine used internally. This does the work of parsing the passed string. Returns 0 if no object completed, 1 if there is no more data, and an object was completd, returns 2 if there is more data and a parsed object is found. if completedAtEnd is true, dangling values are returned, for example "1234" isn't known to be completed, more of the number might follow in another buffer; if completeAtEnd is passed, this iwll return as number 1234. Passing empty arguments steps to the next buffered input value. |
| value | () | Returns the currently completed object. Used to get the completed object after calling \_write. |
| reset | () | If or _write() throws an exception, no further objects will be parsed becuase internal status is false, this resets the internal status to allow continuing using the existing parser. ( May require some work to actually work for complex cases) |
| usePrototype | (className,protoType) | configure what prototypes to use for class recovery |
` js`
// This is (basically) the internal loop that write() uses.
var result
for( result = this._write(msg,false); result > 0; result = this._write() ) {
var obj = this.value();
// call reviver with (obj)
// call callback with (obj)
}
` js
// Example code using write
function dataCallback( value ) {
console.log( "Value from stream:", value );
}
var parser = JSON.begin( dataCallback );
parser.write( '"Hello ' ); // a broken simple value string, results as 'Hello World!'
parser.write( 'World!"' );
parser.write( '{ first: 1,' ); // a broken structure
parser.write( ' second : 2 }' );
parser.write( '[1234,12'); // a broken array across a value
parser.write( '34,1234]');
parser.write( '1234 456 789 123 523'); // multiple single simple values that are numbers
parser.write( '{a:1} {b:2} {c:3}'); // multiple objects
parser.write( '1234' ); // this won't return immediately, there might be more numeric data.
parser.write( '' ); // flush any pending numbers; if an object or array or string was split, throws an error; missing close.
parser.write( '1234' );
parser.write( '5678 ' ); // at this point, the space will flush the number value '12345678'
`
If you’re running this on Node, you can also register a JSOX require() hookrequire()
to let you .jsox files just like you can .json files:
`js`
require('jsox/lib/require');
require('./path/to/foo'); // tries foo.jsox after foo.js, foo.json, etc.
require('./path/to/bar.jsox');
This module also provides a jsox executable (requires Node) for converting
JSOX files to JSON:
`sh`
jsox -c path/to/foo.jsox # generates path/to/foo.json
This is also implemented as part of npm sack.vfs
as a native code node.js addon. This native javascript version allows usage in browsers.
C/C++ Amalgam version jsox-wasm
Possible release of amagamated source, native Node Addon (standalone). (Amalagmanted source is for now in jsox-wasm repository).
Working on a WebAssembly version. jsox-wasm
The overhead of the string exchange between WASM and JS (strings, key names of objects), defeats any benefit from 0 garbage collected/managed parsing.
~~This is as fast as the javascript version of Douglas Crockford's reference implementation [JSON implementation][json_parse.js] for JSON parsing.~~
~~This is nearly double the speed of JSON5 implementation that inspired this (which is half the speed of Crockford's reference implementation).~~
~~This is half the speed of the sack.vfs native C++ node addon implementation (which itself is half the speed of V8's native code implementation, but they can cheat and build strings directly).~~
`sh`
git clone https://github.com/d3x0r/jsox
cd jsox
npm install
npm test
As the package.jsox file states, be sure to run npm run build on changespackage.jsox
to , since npm requires package.json.
Feel free to file issues and submit
pull requests — contributions are
welcome. If you do submit a pull request, please be sure to add or update the
tests, and ensure that npm test continues to pass.
Travis CI is used to automatically test the package when pushed to github. Recently .mjs tests have been
added, and rather than build a switch to test mocha/test/.js instead of just , and depending on node version
switch the test command which is run, the older platforms were removed from testing.
The product of this should run on very old platforms also, especially node_modules/jsox/lib/jsox.min.js.
did not become a string.
- 1.2.122
- Fix parsing {op:f}; partial keyword state, at close of bracket (started to match false).
- Fix NPM Package to include d.ts info.
- 1.2.121
- hotfix on 1.2.120 - dropped module JSOX declaration.
- 1.2.120
- Add JSDoc comments to provide some type information.
- fix quoting the string '[]'; ended up unquoted.
- Fragmented changelog.
- Change external testing tool.
- Quote strings that have a '#' in them.
- allow '#' to start a comment until end-of-line.
- fix cummulative error in column count on a comma after a number.
- 1.2.119
- Provide typescript definitions.
- Provide JSOX as a import name; see issue #13.
- 1.2.118
- Fix stringify with prettify option.
- 1.2.117
- Fix decoding number as first argument in a reference.
- update non-module version with 116 changes too.
- 1.2.116
- Fix parsing negative ISO-8601 Dates.
- generate specific timestamp for new Date( "0000-01-01T00:00:00.000Z" ).getTime()` to return that string anyway.Older changelog in CHANGELOG.md
MIT. See LICENSE.md for details.
http://github.com/json5/json5 Inspiring this JSON6 and subsequently this project.
[Douglous Crockford json parse]: https://github.com/douglascrockford/JSON-js/blob/master/json_parse.js